SERVCE MANUAL (for 220/24OV] REVN~N 2 ._ canon FY8-13AM-020 DEC. 1992 COPYRIGNI 0 1992 L- __-- -.. - .)_ CANON ING. C A N O N NPZl20/2020 REY.2 LIEC.
COPYRIGHT 0 1992 CANON INC. Printed in Japan Imprime au Japon TI disclosure of confidential in- ” Prepared by COPYING MACHINE TECHNICAL INFORMATION DEPT. . COPYING MACHINE TECHNICAL INFORMATION DIV. CANON INC. 890.12, Kashimada, Saiwai-ku, Kawasaki-shi, Kanagawa 211 Japan COPYAIGHT 0 1992 C A N O N I H C . C A N O N NP212012MO REY.1 J A N .
INTRODUCTION This SERVICE MANUAL is intended to provide the serviceman with a basic knowledge of the NP21 20/2020 and has been compiled to serve as a handy referente for his work in the field. The NP21 20/2020 is designed to accommodate the following for fully automated copy work: 1. 2. 3. 4. Sorter-Al, MS-AI ADF-AI Paper Deck Pedestal Control Card V A separate service manual is made available for the Sorter-Al, MS-Al, ADF-Al, and Control Card; see the respective manuals for discussions of each.
SERVICE INFORMATION Issued b y C o p y i n g Mach& Quallty Assurance Cerner. C a n o n Inc MOOEL: N O . : F-E92-043 DATE: 1992, DEC. LOCATION SUBJECT Document Release NP2020 SERVICE MANUAL For 220/24OV The SERVICE MANUAL for the NP2020 has been revised to accommodate the introduction of the NP2120. AH those concemed are hereby requested to discard the old SERVICE MANUAL and use the document attached for purposes for which the document is intended.
R E V I S I O N R: Replacement, S: Supplement, P A G E L I S T MODEL : NP21 20/2020 D: Destroyed, CHAP rm P 1 3 GE 1 A Page 1 RJZVISION MAY JAN. DEC. 1990 1992 1992 0 + 1R CHAP rm 3 PA GE 3 REVISION MAY JAN. 1990 1992 0 + DEC.
R E V I S I O N R: Replacement, S: Supplement, D: Destroyed, P A G E L I S T MODEL : NP2 120/2020 Page 2 CHAP .JXR PA 3 33 0 1R + 34 0 1R + 35 0 -t + 36 0 + -t 37 0 + REVISION MAY JAN. DEC. GE 1990 1992 1992 CHAP I-ER REVISION PA MAY JAN. DEC.
R E V I S I O N R: Replacement, S: Supplement, D: Destroyed, P A G E L I S T MODEL : NP2 120/2020 Page 3 20 - OS 1R
R E V I S I O N R: Replacement, S: Supplement, D: Destroyed, Page 4 - OS 1R 24 - OS 1R - - OS 24b - - OS 25 0 + -t 26 0 + + 27 0 -t + 28 0 -t + 29 0 -f + 30 0 -t + 31 0 -t 1R 32 L I S T MODEL : NP2120/2020 23 24a P A G E - - - 33 0 + + 34 0 -t -t
R E V I S I O N R: Replacement, S: Supplement, D: Destroyed, 2 1P 4 Page 5 + + 0 -t + 3P 0 + + 4P 0 + + 0 1R + 6P 0 -t + 7P 0 + -t 8P 0 1P -t 0 + + + 2P 0 -p + 3P 0 + + 4P 0 + + 5P 0 6P 0 -t + 7P 0 + + 1P A + 0 0 -t + + 1P -t + 2P 0 + + 3P 0 + + 4P 5P 0 L I S T MODEL : PAPER DECK PEDESTAL-Cl 2P 5P 3 0 P A G E + +
1. FEATURES ............................................ II. SPECIFICATIONS ................................. A. Type ................................................. B. Construction ..................................... C. Pefformance .................................... D. Others .............................................. III, NAMES OF PARTS ............................... A. Externa1 View ................................... B. Cross-Sectional View ....................... IV. OPERATION ..............
1, EXTERNALS .......................................... A. Externa1 Covers ............................... B. Control Panel ................................... C . Copyboard Cover ............................. D. Fans ................................................. II. DRIVE SVSTEM .................................... A. Lens Drive Unit ................................ B. Scanner Drive Unit ........................... C. Main Motor Unit ................................ III. FEEDSVSTEM ....................
System Configuration The NP21 20/2020 is designed lo accommodate the following for fully automated copy work: A stack o f documents pick-up a n d feed. ADF-Al may be placed for automatic Control Card V W i t h t h e card. the volume o f copy work may t e put under watch. Sorter-Al U p to 2 0 c o p i e s m a y b e a u t o m a t i c a l l y s o r t e d or g r o u p e d b y page. MSAl U p lo 10 c o p i e s may b e a u t o m a t i c a l l y s o r t e d or g r o u p e d b y page.
CHAPTER 1 GENERAL DESCRIPTION 1. II. III. IV. FEATURES.. ......................................... SPECIFICATIONS ................................ NAMES OF PARTS .............................. OPERATION.. ....................................... COPYRIGNT 0 1992 C A N O N ING. I-1 1-2 l-7 1-9 V. WARNINGS AND ACTIONS TOTAKE .............................................. I-12 VI. ROUTINE WORK BY THE USER.. ....... 1-14 C A N O N NPZl20/2MO KV.
l.GENERALDESCRIPTION BW3 1. Front-loading. - Thecopier is designed to aCCept cassettes from the frOnt for ease of use (two cassettes holding 250 sheets each). - The copier is given two cassette holders, thereby eliminating the need forcassetle replacement in making copies of different sizes. - The copier’s multifeeder allows you to feed multiple postcards (NP21 20) 2. Full line of auto mechanisms.
i.GENERAL DESCRIPTION Pa. Type Body Desktop Copyboard Fixed Light source Halogen lamp 1 OO/1 15V model 300W 220124OV model _._ 330W Lens Zoom lens Photosensitive medium OPC ES.
C. Performance Document type Sheet. Book, 3-D object (2 kg14.4 Ib max.) Jocument size (max.) A3 (297X420 mm)/LDG (1 l”X17”) qeproduction ratio See Table l-1 ; 50% to 200%, zoom. Nait time 90 sec or less (20°C/680F) ?rst copy 9 sec or less :ontinuous copying 1 to 99 copies Zopy size A3/LDG (297 x 431.8 mm) max. (11 in x 17 in) Postcard (100 x 148 mm) min. (3.9 in x 5.
- I.GENERALDESCRIPTION B. Others l-4 COPYRIGNT 0 1992 CANON INC. C A N O N NPZl20/2MO NH.2 DEC.
l.GENERALDESCRIPTION DIRECT REDUCE m ENLARGE 100/220/24OV 1 : 1 (kO.5%) 1 1 1 1 : 0.500 (kl .O%) :0.700 (d.O%) :0.816 (d.O%) :0.865 (fl.O%) 1 1 1 1 : 1.154(+1.0%) : 1.224(fl.O%) : 1.414 (fl.O%) :2.000 (kl.O%) 115v 1 : 1 (?0.5%) 1 1 1 1 :0.500(*1.0%) :0.647 (il.O%) :0.773 @l.O%) :0.786(+1.0%) 1 :1.214(+1.0%) 1 : 1.294(*1.0%) 1 :2.000 (*l.o%) 220/240 V 1 : 1 @0.5%) 1 :0.500 (*l.o%) 1 : 0.707(+1.0%) 1 : 1.414 (kl.O%) 1 :2.000 (kl.
Table l-3 Paper Size 1-6 COPYAIGNT 0 1592 CANON INC. C A N O N NPZl20/2020 R N .
l.GENERALDESCRIPTION A. Externa1 View NP2020 0 @ @ @ Copy tray Copyboard cover POWER switch Delivery unit cover NP21 20 0 Cassette @ Copyboard glass 0 Control panel Figure 1-l NP2020 NP21 20 Fixing assembly knob 0 Developing assembly Drum unit c3 Registration knob (NP2120) Delivery unit release lever 0 Multifeeder (NP2120) Developing assembly release lever Figure I-2 COPYNIGNT 0 1992 C A N O N I N C . C A N O N NP2120/2020 NEV.1 DEC.
1,GENERALDESCRIPTION 5. Cross-Sectional View 1. NP2020 Figure l-3 @ No. 3 mirror @ No. 2 mirror @ No. 1 mirror @ Scanning lamp @ Copyboard glass @ Copyboard cover Q Lens @ Pre-exposure lamp @ Primafy corona unit @0 No. 6 mirror 1-8 @I No. 5 mirror @ No. 4 mirror @ Manual feed pick-up roller @ Manual feed tray @ Vertical feed roller 1 @ Vertical feed roller 2 @I Cassette 1 pick-up roller @ Cassette 2 pick-up roller @ Registration roller @ Transfer corona unit COPYNIGNT f3 1592 C A N O N ING.
1. G E N E R A L D E S C R I P T I O N W 2. NP2120 Figure l-3 a @ Q @ @I @ @ Q @ @ @9 No. 3 mirror No. 2 mirror No. 1 mirror Scanning lamp Copyboard glass Copyboard cover Lens Pre-exposure lamp Primary corona unit No. 6 mirror CWYRIGHT c 1932 C A N O N ING. @ @ @ @ @ @ 0 @ @ @ No. 5 mirror No.
1 GENERAL DESCRIPTION B A. Control Panel 1. NP2020 AIBIINCH SIZE A SIZE Figure l-4 0 PAGE SEPARATION key Press the key to select the page separation mode. Q SORTIGROUP key Press the key to select the SORTIGROUPINONSORT mode; when the indicator is OFF, the nonsort mode is selected.
Figure l-4a @ PAGE SEPARATION key Press the key to select the page separation mode. @ SORTIGROUPISTAPLE SORT key Pressthekeytoselectthesort,group,StapleSOrt, or non-sort mode. The copier is in the non-soti mode when the indicator is OFF. @ FIXED RATIO indicator @ JAM location indicator @ JAM indicator @ CONTROL CARD indicator 0 ADD TONER indicator @ AUTO ZOOM key Press the key to select the auto zoom feature. @ COPY COUNT indicator - indicates the ratio when the % key is pressed.
- ,.GENEWLDESCRIPTION ->.s. ,~ M B. Making Copies 1) Tum the POWER switch ON If the temperature of the fixing assembly is below the specified value, . NP2020 The COPY START key remains red. . NP2120 The COPY START key flashes green. If the temperature of the fixing assembly is above the specified value, the COPY START key goes green. The wait time is normally 90 sec (2O”C, average). 2) Openthecopyboardcover,andplaceadocument face down aligning ti with the size index.
1. G E N E R A L D E S C R I P T I O N @ Do not process each side more than once; and @ Do not use both overlay and two-sided copy modes on a single sheet of paper. Note: 1. Donottiltorshakethedevelopingassembly or CT unit. 2. Do not place the developing assembly or CT unit on the floor; rather, keep them in storage boxes. H. Using the COPY DENSITY CORRECTION Lever If the copies are always dark or light, slide the lever to obtain the desired density.
WZ33 1,GENERALDESCRIPTION 1. Auto-Start (NP21 20) The START indicator goes and remains red when you press the COPY START key during warm-up, and copy operation starts as soon as warm-up is completed. - You can press the COPY START key while the wire is being cleaned or during the jam wait period. . You still have access to the DENSITY key, AE key. RESETkey,orSTOPkeyafteractivatingthe auto-start mode. - To cancel the auto-starl mode, press the RESET or CLEAR/STOP key.
KBld l.GENERALDESCRIPTION A. JAM Indicator ( 8% ) If the indicator goes ON during copy operation, take the following steps; a jam is likely to have occurred at the location indicated. Forjamsinanyoftheoptions(sorterorADF),see the respective service manual. NP2020 Figure 1-9 J a m in ADFunit Jam in copier IJ a m in sorta Figure 1-8 5) Close the delivery unit cover.
7) Open the right cover, and check if paper is jammed; remove the paper, if any. Furiher, check that no paper is sticking out of the cassette. 1. Using the Multifeeder Tray (NP2120) Lift the lever, and pull out the jam, taking care not to tear the paper. \ Right cover Figure l-12a Figure l-ll B. ADD PAPER Indicator ( & ) The indicator goes ON if no cassette is in the cassette holder or the cassette has no paper. 1) Slide out the cassette to the front of the copier. 2) Put paper in the cassette.
C. ADD TONER Indicator ( h ) The indicator goes ON when the black developing assembly is running out of toner. 1. Black Developing Assembly 1) Open the front door. Turn the black developing assembly lever counterclockwise. 3) Pull the black developing assembly to the front until it stops. 4) Open thetoplidofthe blackdeveloping assembly. 5) Shake the toner cartridge side to side about ten times. 6) Placethetonercartridgeontheblackdeveloping assembly.
Advise the user to clean the following once a week without fail: 1) Primary Corona Wire Slide in and out the cleaning wire to clean it. 2) Copyboard Glass Wipe it using a moist cloth; thereafter, wipe it using a dry cloth. 3) Copyboard Cover Wipe it using a mild detergent solution; thereafter. wipe it using a dry cloth. 4) Static Eliminator Clean the static eliminator using the cleaning brush (accessory).
CHAPTER 2 COPYING PROCESS 1. IMAGE FORMATION PROCESS . ...<.... COPYGIGNT 0 1992 CANOH ING. 2-1 II. AUXILIARY PROCESSES . . . . . . . . ..__.._..___ CANOH NPZl20/2tVl AEV.
C o p y b o a r d glass I , ,I j “‘y> ( Scanning lamp Lower fixing roller Sfatic eliminator Transfer corona unit Figure 2-1 1, See Figure 2-l for the construction of the copier Images are formed in the following eight steps: Step 1 Step 2 Step 3 Pre-conditioning exposure Primary corona exposure (negative DC) Image exposure COPYRIGHT 0 1992 C A N O N I N C .
F o r m a t i o n o f Electrostatfc Latent I m a g e Separation r - - - - - - - - - - - - - - - - - --------_ 1 I I 3. I I Image exposure J I / r-- 1. P r e - c o n d i t i o n i n g e x p o s u r e I 4 . Development L-----+-------J 8 . D r u m cleaning 5 . Transfer c o r o n a exposure M a n u a l f e e d tray R Delivery >( ti 6. separaion Registration L9 7 .
C O P Y I N G P R O C E S S K#ZW Inthisstep,orpre-conditioningexposure,thesurface of the drum is exposed to light from the preconditioning exposure lamp. All charges remaining on the surface of the drum from the preceding copy cycle are eliminated in preparation for exposure by theprimarycorona. Suchcharges, if leftastheyare, could result in copies with uneven density. 4. Step 2 6.
8. Step 6 Separation D C bias Figure 2-10 During copy operation, the toner is attracted to the drum by the work of the surface potential of the drum as well as the developing bias (at time of positive component), and it turns the electrostatic latent image to a visible image. The excess toner is repelled by the surface potential ofthe drum and the developing bias (at time of negative component). A DC bias affects copydensity; a larger bias, Le.
10. Step 8 Drum cleaning Cleaning b l a d e \ Scoop-up s h e e t Blade Figure 2-14 In this step, the toner remaining on the drum surface is scrapedoff by thecleaning blade and collected by the scoop-up sheet in preparation of the next copy cycle. The toner is then moved aside by the blade. COPYAIGNT Q 1592 CANON INC. C A H O N NPZl20/2MO KV.
FZB3COPYlNGPROCESS A. Blank Exposure Mechanism The blank exposure mechanism is used to remove the potential from the non-image sections of the drum in the REDUCTION mode or lo suit paper sizes; see p. 3-37. The light from the pre-exposure lamp is reflected by the reflecting plate and directed onto the photosensitive drum.
CHAPTER 3 OPERATIONS AND TIMING Inoutlinediagrams,-- representsmechanícaldrivepaths,andmindicateselectricalsignal paths. Signals in digital circuits are identified as ‘1’ for High and ‘0’ for Low. The voltage of signals, however, depends on the circuit. Nearly all operations of the copier are controlled by microprocessors; the interna1 workings of these processors are not relevant to the serviceman’s work and, therefore, left out of the discussions.
O P E R A T I O N S A N D TIMING EXE&3 14. Functional Construction The copier can be divided into four functional blocks; pick-up/feed system, exposure system, image formation system, and control system. - - \ \ \ - - - -A - - Pi&uplfeed s y s t e m ---- 1 t---------, Paperdeckpedestal \ \ .\ \ - - - - - - - - ---- -l Figure 3-1 COPYAIGHT 0 1992 UINON I N C . C A N O N NPZl20/2lVO AEV.
B. Electrical Circuitry The copier is controlled by the two microprocessors and communication LSI on the DC controller PCB, each of which functions as follows: 1 Microprocessors 1 Q301 (master) . Controls the copy sequence. . Controls the document size identification. Note: The main motor (Mi) is a synchronous motor thatusesthefrequencyofthepowersupplyas referente.
D C controller PCS . Lens h o m e p o s i t i o n SO”501 f Blank shutter h o m e position se”sor * Scanner h e m e postian se”sor * Cleaning unit h o m e positlon s e n s o r . T h e mistar . AE s e n s o r . S S R ON signa1 (NP2120) Microprocessor l * Pre-registraion p a p e r se”sor . separation p a p e r Se”SOr . Delivery s e n s o r * Cassette paper sensor ’ Manual feed tray lxwer semor ’ ioner level s e n s o r .
EZI O P E R A T I O N S A N D TIMING C. Inputs to DC Controller Inputs to DC Controller (1/4) DCcontroller PCB I5311-7 t5v < -6 ’ LHP Lens h o m e p o s i t i o n sensor Blank s h u t t e r h o m e - 2 1 - 92 5 v . & SBHP 1 Pre-registration paper sensor W h e n lens is a t h o m e p o s i t i o n , ‘ 1 ’ . (flag is a t Ql) W h e n b l a n k s h u t t e r is at home position, ‘1’. (llag at 02) W h e n p a p e r is present. ‘1’.
Inputs to DC Controller (2/4) DCcontroller PC8 sw6 wire cleaner nome position switch 5309-3 1 0 , sw9 5309-5 I wfre clearw rear position switch 0 ‘W,CHP -4 -6 , w h e n transfer c o r o n a wire cleaner is a t h o m e p o s i t i o n (front), ‘0’. I I eWCRP ’ w h e n transfer c o r o n a wire cfeaner is a t rear, ‘0’. 4 SIN7 5318-10 Q RDC - 1 1 ’ Righ! door switch Wh?n right door is opa, ‘1’. W h e n paper is present, ‘1’.
5!Z# OPERATIONSANDTIMING Inputs to DC Controller (314) - D C controller P C B - W h e n ‘o’, L E D O goes ON: w h e n d o c u m e n t is p r e s e n t , ‘0’. (output) W h e n ‘ 0 ’ , L E D O goes ON; w h e n d o c u m e n t is p r e s e n t , ‘0’. (output) W h e n ‘o’, L E D O goes ON; w h e n d o c u m e n t is p r e s e n t , ‘0’. (output) W h e n ‘0’. L E D O goes ON: when d o c u m e n t is present, $0’. W h e n S S R is ON, ‘1’ To P . 3-3 Figure 3-5 3-6 COPYAIGHT 8 1Y32 CANOH ING.
Inputs to DC Controller (4/4) DCcontroller PCS Adjusting P C B f - - - - - - - - - - - - - 1 1 1551 5312 -12 5 v I r l-2 - 1 1 1 I l I 1-3 j -10 I I I I 1-4 I I I I - 9 VR5: adjusts image leading edge registration (turn c l o c k w i s e to delay registration clutch ON timing for larger margin). -a V R 3 : a d j u s t s i m a g e l e a d i n g e d g e nonf m a g e w f d t h (turn clockwise to delay grid bias ON timing for larger non-image width).
D. Outputs from DC Controller Outputs from DC Controller (113) D C conuoller P C B W h e n ‘ 0 ’ , RLI goes O F F : sae p . 3 . 4 7 . W h e n ‘i’, fixing heater goes ON. ming l a m p See D. 3-26. Main m o t o r When ‘70’. main motor and scanner c o o l i n g fan go ON. Scanner cooling fan D C power supply P C B Figure 3-7 3-8 COPYAIGHT G 1592 C A N O N ING. C A N O N NPZf20/2020 AN.I O E C .
OPERATIONS AND TIMING Outputs from DC Controller (2/3) D C controller P C B .__ F e e d e r roller clutch 1 W h e n ‘0’. C L 1 goes ON. k’h?n ‘ 0 ’ , C L 2 goes ON. When ‘ 0 ’ . C L 3 goes ON. Multifeeder clutch ( N P 2 1 2 0 only) W h e n ‘0’. C L 4 goes ON. C a s s e t t e 1 pi&up clutch solenoid W h e n ‘ 0 ’ , SLI goes ON. c a s s e t t e 2 pick-up clutch solenoid W h e n ‘0’. SLZ goes ON. Oil application solenoid W h e n ‘0’. S L 3 goes ON. Blank switch solenoid W h e n ‘0’.
8% O P E R A T I O N S A N D T I M I N G Outputs from DC Controller (3/3) D C controller M o t o r driver P C S ! S e e p 3-18. See p . 3-l 7 Cleaning motor See p. 3.38. W h e n ‘0’. t o t a l copy counter goes ON ,“35y J505-1 i 55047 -2 ’ C o n t r o l Card V c r c v ; 2 i W h e n ‘0’. multifeeder present L E D goes ON. ( N P 2 1 2 0 only) - - 4 I Con1rol plel PCS -II W h e n ‘0’. ON. -14lp -3 , “ I 3 J31k7CCmT - I W h e n ‘0’. card present.
OPERATIONS AND TIMINGN E. Basic Sequence 165W329’F 17OW338”F N o t e : V a l u e in p a r e n t h e s e s indicatetemperature w h e n C T unit is in “ s e . Figure 3-10 Period Description Remarks WMUP (warm-up) Between when the power is Waits until the fixing roller The warm-up time varies switched ON and when the is heated. depending on the fixing fixing roller is heated lo 165’0 roller temperature. 329”F(145”C/293”F).
Description Period SCRV (scanner in reverse) Whilethescanner is moving in reverse. Returns the scanner to the home position in preparation for the next copy. LSTR (last rotation) FromwhenSCRViscompleted until the main motorstops after thecopypaperhasmovedpast the delivery sensor. Cleans the drum surface electrostatically. STBY (standby) FromwhenLSTRiscompleted Waits for a press on the until theCOPY STARTkey is COPY START key or pressed or power is switched operation keys. OFF.
A. Varying the Reproduction Ratio The reproduction ratio across the drum (axial) is varied by the lens drive system and that around the drum(circumferential), bythescannerdrivesystem. The lens drive system contains a zoom lens and, as shown in Figure 3-11, the position of the lens and the focal distance are shifted to vary the reproduction ratio across the drum. ThescannerdrivesystemmovestheNo.1 mirror faster in relation to the drum rotation for reduced copies or slower for enlarged copies.
OPERATIONS AND TIMING B. Lens Drive System 1. Outline The lens unit is driven by the lens drive motor (M3). The lens drive motor also serves to move the blank exposure shutter and is switched by the blank shutter solenoid (SL4); see p. 3-37. When the blank shutter solenoid (SL4) goes ON, the drive is transmitted to the lens drive pulley to move the lens unit. WhenthepowerisswitchedON, SL4goesON to rotate the lens drive motor, thereby moving the lens to the home position.
OPERATIONS AND TIMINGM B l a n k shutter solenoid (SL4) \ Lens drive m o t o r r - l Lens drive pulley B l a n k shutter drive ENLARGEMENT Figure 3-13 Lens Drive System (viewed from above) COPYAIGHT 0 1992 CANON IWC. C A H O H HPZlZO/ZMO KV.
OPERATIONS ANDTIMING 2. Basic Sequence for Lens Drive System (reduction) C O P Y S T A R T k e y ON P O W E R s w i t c h ON ’ WMUP ‘P==F DIRECT Lens drive m o t o r ( M 3 ) I I t B l a n k shulter solenoid ( S L 4 ) c Lens h o m e position s e n s o r (Qí) L Blank shutter home position sensor w Figure 3-14 @ Sets the lens at the DIRECT position. 0 Sets the blank shutter at the home position. @ Sets the lens at a point suited to the specified reproduction ratio.
O P E R A T I O N S ANO TIMING RSSZ 3. Lens Drive Motor Circuit The lens drive motor is a stepping motor and rotatesin responsetothedrivepowersignal(LNSTB) and pulse signals (LNA. LNA, LNB, LNB). 5308 Tostartthelensdrivemotor, LNSTBgoes’l’; and the motor is rotated by applying pulses on each phase in sequence. When the lens drive motor is at rest, LNSTB is ‘0’; the motor is supplied with current by way of R418 so as to hold the lens in place.
C. Scanner Drive System 1. Outline Thescannerisdrivenbythescannermotor(M2). The scanner motor changes its direction of rotation to move the scanner forward and in reverse. When the scanner moves forward, the motor speed is changed to suit the specified reproduction ratio; when the scanner mover in reverse, however, its speed is constant regardless of the reproduction ratio (3.5 times as fast as when moving forward).
2. Relationship Between Sensor and Signals Scanner Scanner sensor Signa1 Description Forward Scanner home position SCHP In reverse - Registration clutch ON - Grid high voltage output ON -L * Scanner reverse OFF (0.1 sec later) Table 3-2 3. Basic Sequence for Scanner (ENLARGE/REDUCE) POWER switch ON COPY START key ON COPY START key ON Figure 3-17 COPYRIGNT @ 1992 C A N O N ING. C A N O N NPZl20/2CQO AB.
4. fblovement of Scanner in Page Separation Mode (2 documents) Documentleading Documentleading e d g e o f Istpage e d g e o f istpage Documentleading Documentleading e d g e o f Istpage edgeof Istpage Documentleading Documentleading Forward.i-kForward i--i-Fo¡ward+-&Fonvard&= Reverse Reverse Reverse Figure 3-18 1, ll, and III shown in Figure 3-18 are controlled with referente to the document leading edge (falling edge of 04) of the first page.
OPERATIONS AND TIMING m D. Document Sìze Identification 1. Outline The copier is equipped with auto paper selection and auto reproduction ratio selection mechanisms. These mechanisms call for identification of the document size as described below.
OPERATIONSANDTIMING C o p y b o a r d cover m o v e d down C o p y b o a r d cover m o v e d up 77 r Y C o p y b o a r d cover switch 1 (SW4) C o p y b o a r d cover switch 2 (SW5) ON - ON - 200 0 I I I l ! D C controller identilies I the dacument size 1 I I I OFF 1 OFF 50 Tl I Document identification timing D o c u m e n t i d e n t i f i c a t i o n circuit L E D Figure 3-20 Document Identification Timing 3-22 COPIAIGHT 0 1992 C A N O N ING. C A N O N NP2120/2020 KV.
OPERATIONS AND TIMING 11 3. Identification of Document Size Document identification circuit The DC controller identifies the size of documents based on the levels of the output from the document identification circuit; see Table 3-3.
OPERATIONS AND TIMING - Controls the scanning lamp. - Controls the primary/transfer coronacurrent and grid bias voltage. - Controls the developing bias. - Measures the document density. - Controls the developing assembly and drum cleaning unit. - Controls the blank shutter. A.
OPERATIONS AND TIMING B. Basic Sequence of Image Formation P O W E R switch ON C O P Y S T A R T kev PtimaryITransfercorona unit G r i d tias I I l I 1-1 J I I I Figure 3-23 COPVRIGHT 0 1992 CANON I N C . C A N O N NPZl20/2MO RN.
C. Controlling the Scanning Lamp 1. Outline The scanning lamp iscontrolled bythe DC controller PCB as follows; see Figure 3-24. - Turns the scanning lamp ON and OFF. * Controls the scanning lamp intensity. 2. ivlechanism a. Turning the Scanning Lamp ON and OFF The microprocessor (slave; Q302) on the DC controller PCB causes the transistor (Q324) to goON,therebycausingthescanninglamp(LAl) to go ON; the lamp goes OFF when Q324 goes OFF. b.
Theerrordetectioncircuit alsogoesONwhenthe thermal fuse (Ful) or the scanning lamp blows, causing the relay (RLI) togo OFFandcuttingthe AC power. The above condition prevents generation of the zero-cross and causes ‘E221’ to be indicated on the control panel. 3. Copy Density Correction Lever The copy density correction lever serves to prevent foggy images caused by deterioration of the photosensitive drum.
WI¶ O P E R A T I O N S A N D T I M I N G D. Controlling the Primary/ Transfer Corona Current and the Grid Bías Voltage 1. Outline Figure 3-27 shows the circuii which controls the current for the primary/transfer corona unit and the voltage level of the grid bias; it has the following functions: @ Turns the primaryltransfer corona current ON and OFF; @ Controlstheprimary/transfercoronacurrenttoa constan! value; @ Switches the grid bias voltage level of the primary corona unit.
4. Turning the Grid Bias ON and OFF @) When the image is exposed, the DC controller 9=“,““,=,. %7goesON; nooutputfromthecomparator circuit. bQ6 goes OFF. bcurrent flows into the transformer (14); 05 goes OFF. “~í;;“B”,ha,;“. @ When the image is not exposed, the DC controller generates GRDON=l. ka7 goes OFF; output from the comparator circuit. bQ6 goes ON. L*current does not flow into the transformer (T4). bgrid bias is not applied.
E. Controlling the Development Bias 2. Mechanism a. Tuming the Development Bias AC Component ON and OFF 1. Outline Figure 3-28 shows the circuit that controls the development bias and has the following functions: 0 Tums the development bias AC component ON and OFF. Q Controls the development bias DC component voltage level.
OPERATIONS ANDTIMING B b. The above condition supplies the developing cylinder with DC biases. DCBC varies between 6 and 16 Vas adiusted by the copy density key. Controlling the DC Bias Voltage Level Fioure 3-28 shows the differential amplifier circuit, which operates when DCBC is 16 V or less. Controlling the DC Bias Voltage Level DCBCis6to16V. bdifferential amplifier circuit goes ON. bvariable pulse generator goes ON. hDC high-voltagetransformergoesON.
mOPERATIONS ANDTIMING 3. Control Sequence for Development Bias C O P Y S T A R T k e y ON ST \\hlLP B 1 -, ó‘ i\IlLPR ’ IhTR SCF\\ SCRT SCF\\' SCR\I LSTH S'I'UY Grid bias Figure 3-29 @ The levels of the development bias DC component control signa1 and DC bias vafy according to the copy density key and AE sensor output. The level of the DC bias during image exposure varies according to the type of developing assembly.
F. Measuring the Document Density 1. Outline The copier has an automatic exposure (AE) mechanism, which controls the DC component of the development bias according to the density of the document. If the document is uniform in density, the AE mechanism varies the DC omponent of the development bias to enable reproduction of fog-free copies. NOTE:A represen& AE s e n s o r positmn. (approx.)(approx.) Figure 3-30 2. Mechanism 3.
~OPERATIONSAND T I M I N G 4 . Adjustment The following adjustments should be made when the AE sensor or adjustment PCB has been replaced; starl with adjustment of the AE referente point and then AE slope, and make sure both adjustments are made without fail. 6) Adjust VR1 (AE ref.) on the adjusting PCB so that the copy counter on the control panel indicates ‘20’. @ Adjusting the AE Referente Point 1) 2) 3) 4) 5) Remove the adjustment cover from the rear of the left cover. Switch the power ON.
8) @ Adjusting the AE Slope 1) Remove the Test Sheet, place a newspaper on the copyboard, and close the copyboard cover. 2) Press the SORTIGROUP key on the control panel. * The copier operates as in step 5) of “Adjusting the AE Referente Point.” 3) Take notes of the value shown on the copy counter of the control panel. 4) Press the SORT/GROUP key on the control panel. - The copy counter on the control panel will indicate ‘0’. 5) Enter ‘1’ on the tenkey pad on the control panel.
m OPERATIONSANDTIMING 2. Monitoring G. Developing Assembly and Drum Cleaning Unit 1. Outline The blade and developing cylinder inside the drum cleaning unit are rotated by the drive from the main motor. The level of toner inside the black developing assembly is monitored by the toner sensor (Q9): and, whenthefevelfalls belowaspecifiedvalue, the ADD TONER indicatoron the control panel starts to flash. The CT unit cannot be replenished with tener; replace the CT unit as a whole when it runs out of toner.
H. Blank Control 2. Controlling the Blank Exposure Shutter 1. Outline The copier uses the light from the pre-exposure lamp to black out the non-image section in the REDUCE mode or section not in contact with the drum in the DIRECT mode. The blank exposure shutter serves to control the area over which the light is directed. The blank exposure shutter is operated by the drivefrom the lens drive motor (M3) by way of gears when the blank shutter solenoid (SL4) is OFF.
m O P E R A T I O N S AND T I M I N G 1. Controlling the Transfer Corona Wire Cleaning Mechanism 2. Cleaning Niechanlsm 1. Outline The copier has an automatic cleaning mechanism for the transfer corona wire; cleaning is executed when the power switch is turned ON or when the fixing assembly is 1OO”C/212”F or below. The wire cleaner is moved by the cleaner motor (M4) back and forth once along the wire (about 20 sec).
The control card, on the other hand, increases the count in response to each pick-up. The presente of paper in the upper and lower cassettes is checked by photointerrupters (Q6, Q7); if paper is absent, the cassette out signa1 (UPCPD, LCPD)goes’O’andtheADDPAPERindicatoronthe control panel starts to flash. A. Outline Figure 3-39 shows the basic construction of the pick- up/feed system.
OPERATIONS AND TIMING DC controller PCB * ,’ , , f . 5 r > : ;c : > 1 2 > > Clubh Figure 3-39 3-40 COPYAIGNT 8 1992 CANON ING. CANON NPZl20/2020 RN.
OPERATIONS AND TIMING 2. Sequence for Pick-up/Feed System COPY START key ON ON . Control Card V, if attached, ,ncreases the coun, when the pick-up clutch solenoid (SLI, SLZ) goes ON. Figure 3-40 COPYAIGNT 0 1992 CANON INC. CANON NPZ120/2MO REY.
m OPERATIONSANDTIMING 3. Manual Feed Pick-Up (NP2020) When copy paper is slid along the manual feed tray, the manual feed sensor (Qf3) detects the copy paper and the main motor (Mi) starts to rotate in response. At the same time, feeder roller clutch 1 (CLI) goes ON, thereby feeding the paper up to the registration roller. The sequence used to feed the copy paper in the manual mode is the same as in feeding A3 paper regardless of the size of the copy paper.
OPERATIONS AND TIMING 4. Using the Multifeeder (NP2120) a. Outline When you are using the multifeeder, copy paper is picked up from the stack on the tray. This way, you can feed sheets one after another. Thepresenceofastackonthetrayis detected by the multifeeder paper sensor (Q8). The stack on the tray is pushed against the pickup roller by the paper guide plate. The pick-up roller is rotated by the drive from the main motor (Mi) transmitted by clutches.
m OPERATIONS AND TIMING b. Sequence of Operations (pick-up from multifeeder) COPY START key ON Figure 3-39b 3-42b CWf’flIGHT 0 1992 CANON ING. CANON NPZl20/2020 RN.0 OEC.
OPERATIONS AND TIMING m B. Identifying the Cassette Size Based on the combinations of the switches which have been actuated, the microprocessor recognizes the presence/absence of a cassette as shown in Table 3-4 and, at the same time, determines where to reverse the scanner and how to control the blank shutter. The presence/absence of a cassette in the cassette holderand thesize thereof are identified byfour switches (CSTI through CST4) provided in each cassette holder. x 0: SW is OFF. 1: SWisON.
C. Fixing Assembly and Delivery Assembly 1. Controllfng theFfxfng RollerTemperature The upper and lower rollers of the fixing assembly and the delivery roller of the delivery assembly are driven by the main motor (Mi). The upper roller has a built-in heater (Hl ,90 W), which heats the roller. The DC controller monitors the surface temperature of the upper roller by a thermistor (TH) to make sure that it will remain as specified. The specifics of the control are as follows: a.
O P E R A T I O N S A N D TIMING B 2. Oil Application Roller The upper fixing roller is provided with an oil application roller for cleaning and application of oil. Normally, the oil application roller remains away from the fixing roller, and it comes into contact with the upper fixing roller only when copy paper passes through.
B?BI OPERATIONSANDTIMING ‘1 ‘2 165”C/329”F 17OYY336”F (145”C/293”F)(150’C/302°F) ~~ ~~ P O W E R switch rlFF ~~ controlled at 150°C/302”F (CT unit) Figure 3-44 When the copier enters the pre-heat mode in response to a press on the PREHEAT key, the temperature of thefixing assemblyiscontrolled to 140°C regardlessofwhetherthe blackdevelopingassemblyorCTunit isused. However, in the case of the NP2120, the temperature is controlled as in the standby period. ‘1 140°C; if NP2120, 160%.
The lamp regulator generates LIGHT=l (scanning lamp ON signal) at all times as long as the scanning lamp is ON. The above conditions cause the No. 2 comparator of Q309 to generate ‘1’. thereby charging the capacitar (C333). C333 becomes fully charged about 20 seconds thereafter: and output ‘1’ of the No. 2 comparator is sent to the negative (-) input side of the No. 3 comparator. As a result, the output of the No. 3 comparator of Q309 goes ‘0’.
OPERATIONS AND TIMING The signals (LIGHT, SSRON, HTRD, TH) shown in Figure 3-45a are input signals to the error detection circuit. An error in these signals causes the error detection circuit to issue the ACOFF signal, thereby activating the AC shutoff relay (RLl). E. Error Detection Circuit (NP21 20) 1.
OPEWTIONSANDTIMING b. Detection by Hardware If the software detection mechanismfails to function, the error AC shutoff relay (RLI) is turned OFF under the following three conditions (A, B. C). @ the SSR ON signa1 (SSR ON) identifies the activation of the heater despite the absence of the heater drive signa1 (HTRD) generated by the microprocessor. thescanning IampONdetection signa1 (LGHT) leams that the scanning lamp remained ON continuously (about 20 sec).
w OPERATIONS AND TIMING Error Code EOOl ..’ When the output of the fixing temperature detection signa1 (TH) exceeds 23O”C, the error detection circuit issues EOO to the microprocessor. In response, the microprocessordisplays EOOI. If E004 has been identified in advance, the microprocessor displays E004 instead. E004 .‘. The heaterdrive signa1 (HTRD) is not generated for 3 seconds after power-on. E004 is issued if the SSR ON is issued to the DC controller during the absence of the heater drive signal.
B OPERATIONS AND TIMING F. Jam Detection The copier monitors the movement of copy paper using the following three sensors: * Pre-registration sensor (Q3) - Separation sensor (Q5) - Delivety sensor (SWB) Jams are identified in terms of the presencel absence of paper at respective sensors at such times as programmed in the microprocessor in advance.
OPERATIONSANDTIMING @ Pick-Up Delay Jam The microprocessor identifies a pick-up delay jam il the paper fails to reach the pre-registration sensor (Q3) within a specific time after pick-up operation. COPYSTARTkey ON Pick-up clutch solenoid (SLl,SL2) m m ‘1 ( ‘1 Jamckck I I ( Pre-registration sensor(ca3) Main motor(M1) Fixing heater(H1) ‘Variesbetweencassettes,and2.
OPERATIONSANDTIMING @ Separation Stationary Jam The microprocessor identifies a separation stationary jam if the paper fails to move past the sepa- ration sensor within a specific time after the separation sensor (Q5) detects the paper. Figure 3-49 @ Delivety Delay Jam The microprocessor identifies a delivery delay jam if the paper fails to reach the delivery sensor within a specific time after the separation sensor (Q5) detects the paper. Jam check Figure 3-50 3-50 CUPYRIGNT 0 1992 CANON ING.
OPERATIONSANDTIMING @ Delivety Stationary Jam The microprocessor identifies a delivery stationary jam if the paper fails to move past the delivery sensorwithinaspecifictimeafterthedeliverysensor (SWB) detects the paper. ..,., Figure 3-51 COPYNIGHI 0 1592 CANON INC. C A N O N NP2,20/2MO RN.
v. PQWEW SUPPLY 2. Protection Mechanism for Power Supply Circuit A. DC Power Supply The DC powersupply is equipped with protection mechanisms to cut off the power should any of the loads suffer a shorl because of an error. The protection mechanism for 24V power is the over-current detection mechanism in the switching regulator (Q204); upon activation, the circuit also cuts off 12V and 5V outputs. For 12V power, a current fuse serves to protect against an over-current.
B. DC Power Supplyfor Options 2. Protection Mechanism 1. Mechanism TheprotectionmechanismoftheDCpowersupply for options makes use of the over-current protection circuit inside the switching regulator (QIOI). It is also equipped with an over-voltage protection circuit identical with that for the DC power supply of the copier itself. The output. after activation of the protection mechanism, can bereturnedbyturningoffthepower, correcting the relevant load oftheoption, and turning the power ON once again.
OPERATIONSANDTIMING POWER nti-condensaion h e a t e r 100~ on,y Drum heater 100/22ov only Fixinq heater cl Scanning lamp ) 24V 12v / ’ ’ DC power SUPPfY 5v COrltrOller PCB l-l SortedDF 24V 5 v Paper dack pedestal 1 ------. .- L----- ------/--iEq Figure 3-54 3-54 COPYNIGNT 8 1992 CANON INC. CANON NP2l20/2MO RN.1 OEC.
A. Outline The service modes are available foruse in adjusting and checking some of the sensors and loads and can be activated by pressing the service switch (SWI) on the adjustment PCB. See the table below fordescriptionson each of the seven service modes. Service mode No. Description AdjustmentChecks 0 The scanner movesforward to the pointof AE Use it to adjust the AE referente point; for measurement, and the scanning lamp goes details, see p. 3-34.
OPERATIONS AND TIMING B. Using the Service Mode 1) Remove the adjustment cover found below the left cover (rear). 4) Enter the No. of the desired service mode using the tenkey pad on the control panel. * EX.: If ‘0’ is entered, the indicator indicates ‘0’. 5) Press the SORT/GROUP key on the control panel; this activates the service mode. 6) PresstheSORT/GROUPkeyonceagaintostop execution of the service mode. 7) Press the service switch (SWl) on the adjustment PCB to leave the service mode.
7x-l OPERATIONS AND TIMING KZZ3 The copier’s microprocessor is equipped with a mechanism to check its condition (sensors, in partitular). The microprocessor monitors the operation Cause Error code r n m b7 -aa‘- ’ ” ” ’ r bm7 b= b,( )A of the copier as necessary and, if it finds an error, it indicates an error code on the copy counter on the control panel. See thetable belowfordescriptionsof each ofthe error codes; for EOOO, ‘E’ and ‘000’ are flashed alternately.
Error code b’ b 4 b’1 b7 Cause - ADF controller (faulty) ADF power supply (faulty) ADF sensors (faulty) DC controller (faulty) b= 7bLtb,( - b7bTbZ 3 bA b-t A A - Softer controller (faulty) - DC controller (faulty) Description 0 An error in communication with the ADF cannot be cleared. - The sensor output within the ADF has an error. (If the ADF is faulty, only ‘E400’goes ON; therefore, check the communication line and sensors and motor in the ADF.
CHAPTER 4 MECHANICAL SYSTEM 1. Disconnect the power cord for safety before disassembly or reassembly work. 2. Group the screws by type (length and diameter) and location. 3. The fixing screw for the grounding wire and varistors is fitted with a washer to ensure electric conductivity; be sure to use the washer for reassembly. 4. One of the mounting screws of the rear cover is fitted with a washer to protect against static electricity; be sure to use the washer for reassembly. 5.
MECHANICALSYSTEM W NP2020 NP2120 @ @ @ @ @ @ Copyboard cover Left cover Delivery cover Copyboard glass Control panel Front door Q @ @ @ 0 @I Cassettes Lower front cover Right cover Upper rear cover Rear cover Multifeeder Figure 4-2 NP2120 Figure 4-l COPYAIGHT 0 1992 CANON INC. Remove the covers as necessaty for cleaning, inspecting, or repairing the inside of the copier. Covers that can be detached by mere removal of the screws are leff out of the procedure. CANON NPZIZOUXO REY.1 OEC.
MECHANICALSYSTEM Note: * Hook in A * Hook in C Make sure that the copier is closed before removing the copyboard glass. Use an alcohol solution to clean the copyboard glass; the use of a solvent can corrode the white paint along the right edge of the glass. 1. Rear Cover 1) Remove the air filter. Figure 4-5 - Hook in B Upper rear COYer @ Air filter covef @ Air filter Figure 4-3 2) Remove the four mounting screws.
Inside Covers (left, right) 4 . Leff Cover Remove the inside cover (fixing assembly knob; left); be sure to remove the ozone filter holder in advance. Remove the inside cover (right); be sure to remove the drum unit and developing assembly in advance. 1) Remove the rear cover. 2) Remove the four mounting screws. J @ Inside cover (right) Q Inside cover (left) @ Ozone filter holder @ Drum unit @ Developing assembly @ Fixing assembly knob Figure 4-7 @I Left cover 0 Mounting screws Figure 4-9 3.
W MECHANICALSYSTEM 4) Move the left cover up to remove. 5. Right Cover 1) Remove the rear cover. 2) Loosen the two mounting screws of the copyboard glass retainer, and remove the four mounting screws of the right cover. 0 Left cover Figure 4-11 - Cross Section of A NP2020 Lencover Copierframe Copybard glass retainer Figure 4-12 Note: If a sorter (sorter-Al) is attached, pull up the left cover to remove.
CMECHANICAL SYSTEM t!Z%m C. Copyboard Cover 1. Replacing the Contact Sheet The contact sheet is attached to the copyboard retaining plate using tape; pull on its corners to remove. After attaching a new sheet, press over the sheet to even it out. D. Fans @ Right cover Q Lower front cover @ Engagement 1. Outline Figure 4-14 B. Control Panel 1) Remove the inside cover. 2) Remove the five mounting screws and grounding wire. and pull the control panel up to remove.
RZ?B MECHANICALSYSTEM . ..*I. 2. Scanner Cooling Fan 1) Remove the rear cover. 2) Disconnect the connector (J63). 3) Remove the three mounting screws, and remove the fan. ,-. c .? r .-,. 3) Open the front door. and remove the ozone filter and inside cover(lef&; thereafter, lowerthefeed unit. 4) Put a hand under the exhaust fan unit, remove the two mounting screws, and pull it out to the front with care.
MECHANICALSYSTEM Ba. Lens Drive Unit 1. Outline The lens drive system serves to drive both the lensandblankexposureshutter; thedriveisswitched by the blank shutter solenoid (SL4). Lmddrive motor 1-1 : lensdiveunitisshownasshaded. Figure 4-20 COPYNIGHT 0 1592 CANON INC. CANON NPZl20Q~O MV.
MECHANICALSYSTEM 2. Lens Drive Unit 1) Remove the lamp regulator 0 3) Slide the scanner motor somewhat, remove the twomountingscrews,disconnecttheconnector, and remove the lens drive unit. @ Lens drive unit Q Connector Lamp regulator Locking supports Figure 4-23 Figure 4-21 2) 0 0 Remove the four mounting screws of the scanner motor; take careto keep the scanner drive cable intact. @ Mounting screws 3. Lens Cable Route the lens cable as shown in Figure 4-20.
B. Scanner Drive Unit Scrèw B Screw A Figure 4-24 1. Detaching the Scanner Cable 2. Attaching the Scanner Cable 1) Mark the position of the fixing plate using a scriber, and loosen two screws B, which hold the fixing plate in place. 2) Loosen screw A, and detach the scanner cable. 1) Route the cable as shown in Figure 4-24. 2) Turn screw Ato adjust the position of the fixing plate; align it with the line drawn using a scriber. 3) Tighten screw B. COPYRIGHT G 1992 CANON ING. CANON llP2120/2020 RN.
3. Adjusting the Scanner Driver Cable Move the No. 1 mirror mount to the home (start) position, pull the cable using a spring gauge (A in Figure 4-25), and turn screw A so that the reading of the gauge is about 1 .O fo.05 kg. N o . 1 No. 2 and mirror 3 mirror mount mounts 4. Adjusting the Mirror Position (optical length between Mo. 1 and 2 Mirrors) Adjust the relative position of the mirrors when the mirror drive cable has been re-routed. Theposition can be adjusted by moving thefixing used for the No.
MECHANICALSYSTEM m W The paper paper will show contraction caused by heat after it has gone through the copier. 4 ) PlacepaperAandpaperBtogetheralignedover the left lines, and adjust the No. 1 mirror mount so that distances x and y in Figure 4-27 are 5. Lubrication Clean the scanner rail; thereafter, apply lubricant evenly along the rail. - Copied (A) - Fed (B) Figure 4-27 x=y X’Y X
an M E C H A N I C A L S Y S T E M C. Main Motor Unit 2. lblounting the Main Motor 1. Removíng the Main Motor The drive of the main motor is used to drive the drum and execute pi&up operations by way of timing belts. To adjust the tension of the timing belt used to drive the drum, push the center of the belt using a spring gauge with a forte of 500 g. and select the main motor mounting holewhich enables the top and bottom of the belt to be 20 to 25 mm; see Figure 430.
Pick-Up Roller Detach the pick-up roller from the pick-up roller shaft. A. Pick-Up Unit 1. Pick-Up Roller Shafts (upper, lower) Detach the rubber from the pick-up roller: see Figure 4-34. 1) Remove the lower front cover. 2) Remove the shaft flange, and remove the pickup roller shaft.
4. Registratíon Roller 6 ) RemovetheE-ring,tensionspring,andbushing, and remove the registration roller. 1) Remove the rear cover. 2) Disconnect the connector, remove the grip stop ring, and remove the registration clutch.
5. Feeder Rollers (1, 2) 6. Manual Feed Pick-Up Woller (NP2020) 1) Remove the feeder rollerclutch using a hex key. 1) Remove the right cover. 2) Remove the manual feed pick-up unit; two mounting screws, one connector. Feeder roller clutch @ Manual feed pick-up unit @ 0 Mounting screw 0” Hex key Figure 4-39 2) Connector Figure 4-42 Remove the E-ring and gear; be careful with the parallel pin.
7. Betaching the Multifeeder (NP2120) 1) 2) Detach the copier’s right cover. Remove the three jacks. 8. Detaching the Wlultifeeder Separation Pad (NP2120) 1) Detach the right cover. 2) Remove the screw, and detach the separation pad together with its mount. @ Screw @ Mount @ Jacks Figure 4-44a Figure 4-441~ 3) Remove the four screws, and detach the multifeeder assembly. 3) Take out the separation pad into the direction of the arrow.
MECHANICAL SYSTEM E?I3 9. Detaching the Multifeeder P i c k - U p Roller (MP2120) 4) Detach the pick-up roller togetherwith its shaft. 1) Detach the right cover. 2) Remove the screw, and detach the bushing; then, detach the roller cover. 0 @ Pick-up roller Figure 4-4421 @ Bushing Q Roller cover Figure 4-44e 3) Remove the E-ring (plastic), and move the busing in the direction of the arrow. @ E-ring Q Bushing Figure 4-441 COPYAIGNT 0 1992 CANON INC. CANON NP2l20/ZMO AN. OEC.
w MECHANICALSYSTEM 4) Remove the insioe leftcover, and remove the Ering and bushing. B. Feeder Unit 1. Feeder Unit Note: Make sure that the drum unit, transfercorona unit, and developing assembly are removed before removing the feeder unit. 1) Relpace the feeder unit. 2) Remove the main motor unit. 3) Disconnect the connector (J309) from the DC controller PCB, and remove the grounding wire.
2. Feeder Belt 4) Disengage the hook, and remove the motor 1) Remove the feeder unit. 2) Remove the two screws from the front, and remove the screw mount, brushing, lead screw, and gear.. cover. 5) Remove the four fastons from the microswitch. 6) Remove the screws at the rear, and remove the corona unit rail. 7) Detach the feeder belt.
IV. YSTEM EXP A. Illuminating Unit 1. -.: Remowing the Scanning bamp 1) Disconnect the power plug. Remove the copyboard glass. 3) Remove the mounting screw, and remove the light shutter. 2) Note: i. Wait until the scanning lamp has cooled before starting the work. ii. Do not leave finger prints on the scanning lamp. iii. Dry wipe the scanning lamp if it is soiled. 2. Remowing the Thermal Fuse 1) Remove the control panel, and remove the copyboard glass. 2) Hold the rear side of the No.
MECHANICALSYSTEM m B. Blank Exposure Unit 1. Construction J 4I h2 @ HVT @ Connector 2. Re-Exposure P C B Figure 4-58 1) 2) Remove the rear cover. Disconnect the connector (J731) from the preexposure PCB. 3) Hold thepre-exposure PCB using a wrench, and pull it straight up; take care not to damage the PCB and elements on it. 4) Holdtheblankexposureunitfrombelow, remove thethreemounting screws, andpull ittothefront to remove. 3.
.L”, ‘*. :+vi.--<.
MECHANICALSYSTEM 2. Cleaning lfthe photosensitivedrum is soiled, clean it using a flannel cloth coated with toner; do not use paper, ling-free or otherwise. A. Drum Unit 1. Removing the Drum Unit Note: 1) Open the front door, and remove the knob. Do not use solvents to clean the drum; or, do not use cleaning powder. @ Knob @ Drum unit @ Developing assembly @ Developing assembly release lever Figure 4-64 2) Turn the developing assembly release lever counterclockwise.
B. Primary and Transfer Corona Units b. Transfer Corona Unit 1) Remove the transfer corona unit cover,and remove the transfer corona unit. 1. Outline The photosensitive drum is surrounding by the primary and transfer corona units. The primary corona unit is equipped with a grid plate. 2. Disassembly and Assembly a.
Attaching the Corona Wires for the Primary and Transfer Corona Units c. n Primaty Corona Unit 1) Remove the four tension springs and grid plate. 4) Cutofftheend(excess)ofthecoronawiretoless than 1 mm using a nipper. 5) Hook the loop of the corona wire as shown in Figure 4-70, and fit the wire along the V-groove of the height adjusting block. Hook the corona wire tension spring on the corona wire, and turn the spring three to four times as shown in Figure 4-70.
3. Mounting the Transfer Corona Unit 1 If the wire cleaner mount is not at the home position. perform the following: 1) Check that the wire cleaning mount is at the home position. The wire cleaner mount stops where it is as soon as the copier is turned OFF during cleaning operation; in such cases, work as follows: 1) Movethewirecleanerofthetransfercoronaunit by hand to the rear as far as it goes. Mount the transfer corona unit. 3) TurnthepowerON withthefeederunit released.
MECHANICALSYSTEM 3. Removing the Blade, Developing Cylinder, and Side Seal 1) Remove the developing assembly from the Ea. Developing Assembly 2) copier. Remove the two screws, and remove the developìng assembly upper cover. 1. Construction - Side seal stirn!ng rod Screws 0 Developing assembly upper cover Figure 4-72 Figure 4-74 Removing the Developing Wssembly Turn the developing assembly release lever counterclockwise. Slide the developing assembly with care.
5) Remove the hook, and remove the grip 9) Remove the two E-rings and two gears @ E-rings 0 Gears Figure 4-76 Figure 4-78 6) Remove the three screws, and remove the developing cylinder holder (front), washer, and developing roll. @ Developing cylinder holder Q Developing ro11 @l Screws 10) Remove the two screws, and remove the developing cylinder holder (rear), ball bearing, and developing roll.
MECHANICALSYSTEM s&%$$ 4. Mounting the Side Seal and Blade 3) Mount all parts except the blade. For the gear, engage long tooth a and groove b to put the pieces together. 1) Clean the surface using an alcohol solution to prepare for the attachment of the side seal. 2) Attach the side seals at the locations shown in Figures 4-80 and -81; short, then long seal. Attach tie seal so that the long round hale of the end seal and the round hola of the developing assembly are matched.
NBBl M E C H A N I C A L S Y S T E M 2. Remowing the Fixing Assembly 1) Open the front cover, and remove the fixing assembly knob. A. Fixing Assembly 1. Construction Oil applicati0n roller 0 Fixing assembly knob 0 Mounting screw Figure 4-65 Paper guide Lower roller 2) Remove the left cover. 3) Disconnect the three connectors. 4) Remove the two mounting screws, and slide out the fixing assembly. Figure 4-84 @ Connectors 0 Mounting screws Figure 4-86 4-28 COPYAIGHT 0 1932 CANON ING.
M E C H A N I C A L S Y S T E M mm 3. Fixing Heater 4. Upper Fixing Roller 1) Remove the fixing assembly. 1) Hold the grip of the oil application roller, and pull to the front while lifting to remove the roller. 2) Remove the two fastons. 4-n I wl , li 0 Oil application roller 0 Fastons Figure 4-87 3) Remove the mounting screw, and remove the heater mounting plate (front). 2) 3) Remove the fixing heater. Remove the thermoswitch holder.
5) Remove the C-ring, and remove the gear. @ C-ring @ Gear Figure 4-93 6) Pushthepressurespringofthelowerfixing rolfer down (disengage), and remove the insulating bush and bushing. 8) Push the lower roller pressure spring at the rear of the fixing assembly, and pull out the upper fixingroller intothedirectionof the arrow (frontof fixing assembly). Pressure spring for lower roller Upper fixing roller Figure 4-96 bower Fixing Roller Remove the upper fixing roller.
MECHANICALSYSTEM m 7. Adjusting the Nip (tightening the pressure nut) 8. Mounting the Thermistor The nip width should be as shown in Table 4-l; otherwise, turn the bolt. Check that the detection face of the thermistor is evenly in contact with the surface of the upper fixing roller. Note: The thermistor position need not be adjusted; if thecontact is not even, checkifthethermistor Figure 4-97 Note: aandcrepresent apoint 15 mmfromthesides of the copy. I Dimension Nip’ b 0 kO.5 mm la-cl I 0.
- MECHANICALSYSTEM 9. Mounting the Thermal Switch 10. Positìon of the Paper Guide Check that the detection face of the thermal switch is evenly in contact with the surface of the upper fixing roller. Make sure that the hook of the thermal switch holder is securely engaged with the fixing assembly upper plate. The paperguide is positioned by the paper guide mount. Assuch,thepositionofthepaperguideneed not be adjusted.
11. Removing the Upper Separation Claw 1) Open the delivety unit. 2 Mark the position of the upper separation claw retainer using a scriber. 3) Removethe three mountingscrews, and remove the upper separation claw retainer; be careful with the delivety detection lever at the time. 12.
:. CHAPTER 5 INSTALLATION Thecopieriscarefullyacljustedandstrictlyinspected beforeitleavesthefactoryand, therefore, proper installation is very important in maintaining its out-of-factory performance. Make sure that all the conditions discussed in this chapter are satisfied before installation, and carry out all necessary inspections after installation. 1. II. lll. LOCATION ........................................... 5-l UNPACKING AND INSTALLING THE COPIER ........................................
INSTALLATION BZ% The location of the copier should be chosen based on the following considerations. If posible, make a visit to the userfor a study of the site before delivery of the copier. A. The ambient temperature should be between 7.5”C to 35°C (45.5”F to 85°F) and the humidity, 1 O%to80%. Avoid locationsnearwaterfaucets, humidifiers, water boilers, and refrigerators. B. Avoid locations near open fire or subject to dust or ammonia fumes and direct rays of the sun.
When a piece of metal is movedfrom acold place to a warm place, droplets of waterform on its surface. This phenomenon is known as condensation and affects the performance of machines. The simplest way lo eliminate condensation in the copier, any machines for that matter, is to leave it alone until it warms to room temperature (at least one hour). 14. Unpacking jter work Open the shipping carion. 2 Remove the plastic cover, and pull out the five grips from the copier.
INSTALLATION Xep wolk 5 Remove the tape that secures the optical unil in place (outside the leff cover), and slide the fixing to the right and pull it out. 6 Open the front cover, and disengage the developing assembly, and remove it from the copier. 7 Remove the cushion blocks from the feeder unit and fixing assembly. Remarks Tape Fixing for optical unit Check that the developing cylinder is free of scratches. Cushion blocks COPVRIGHT 8 1992 CANON ING. C A N O N N?Zl20/2070 REY.1 DEC.
#tep 8 wolk Remarks Disengage the feeder unit, remove the knob, and remove the dummy drum. Keep the knob for use later. 9 Remove the lens lock screw (wl shipping tag) from between the drum unit rails of the copier. 10 Open the delivery cover, and remove the two fixing roller release rolls. The reafter, close the delivery cover. 5-4 COPVRIGNT 0 1992 CANON INC. CANON N?Zl29/2MO RN.2 DEC.
INSTALLATION W53 B. Mounting the Drum The photosensitive drum is susceptable to light; if exposed to mom light, it can cause white spots or black lines on the copy images. As such, be quick in performing the following work. itep 1 work Take out the drum cartridge from the box, and remove the light-blocking sheet. Remarks Drum unit Take care not to damage the drum. 2 Set the drum unit in the copier, and fix it in place using the knob that held the dummy drum.
INSTALLATIONm C. Checking the Operation Check that the ADD PAPER and CASSETTE OUT cond copy operation is over. COPYRIGHT F3 1592 CAHOH INC. C A N O N NP212012MO REY.1 OEC.
D. Aciding Toner Remove the toner cartridge, and keep it in Glose the developing assembly lid, and Turn the developing assembly lever on the wpyboard aft key goes green, and make six to ten 5-6 COPYAIGHT 0 1992 CANON INC. CANON NPZlZO/ZMO RN.
INSTALLATION BBZ3 E. Checking the Image work itep Remarks 1 Place the Test Sheet on the copyboard, and check the image. Check that copies are made without a problem and the non-image width along the leading edge is correct; othelwise, make adjustments. Non-image width: 2.0 mm/0.08 ir! (approx.) for leading edge 2.5 mm/O.l in (approx.) on left/right side 2 Feed paper in the manual mode. Make tow-sided and overlay copies, and check that the operation is correct; otherwise, make adjustments.
COPY PaPer The copier’s cassette may be modified to suit the desired paper size by modifying the rear stop plate, spring, and face plate. @ Modifying the Cassette Size 1) Turn over the cassette, and remove the screw that holds the rear stop plate in place. Bottom of cassette Figure 5-3 2) Change the rear stop plate to suit the desired paper size; note the index on the bottom, and see Table 5-l. SiE Rear stop plate A3 297mm5420mm (11.7’X16.
6) Figure 5-4 3) Fixthestopplate inplaceusingscrews(M4XlO). Note: See “Replacing the Cassette Spring” when using a different type of spring. 4) Slide the paper size plate along the index on the bottom of the cassette to suit the desired paper size. Figure 5-7 7) 8) Remove the side stop plate each from the two cassettes. Side sfop plate Place about 100 sheets of paper (fresh out of package, of thedesired size) in thecassette, and butt them against the front of the cassette.
-INSTALLATION I.. *c.- ..b.. . ..< .,, _ ., Il,‘ J 10) Set the cassette size roll; see Table 5-2. COPY paper 1 2 3 4 n 85 u2 w A4 n q 85 n n n 84 A4 Il) Detach and attach the face plate; see Table 5-3.
@ Replacing the Cassette Spring Remove the inside plate and spring - The copier can be reset for a different size of copies by modifying the cassette spring as shown in Table 5- 4. red 84185 Figure 5-I 1 Table 5-4 ARGENTINE LTR GOVERNMENT LTR KOREAN ARGENTINE LGL GOVERNMENT LGL ARGENTINE LTR-R GOVERNMENT LTR-R FOOLSCAP FOLIO AUSTRALIAN FOOLSCAP KOREAN-R ECUADORAN OFICIO BOLIVIAN OFICIO Change the spring as shown in Table 5-4. Set the inside plate, and attach the rubber stoppers.
5ZZ4 INSTALLATION @ Removing the Pick-Up Roller If the cassette is sized to GOVERNMENT LTR, KOREAN, or KOREAN-R, remove the pick-up rollers shown below (metric rollers). * GOVERNMENT LTR and KOREAN * KOREAN-R Figure 5-15 5-12 COPYAIGNT Q 1992 CANON ING. CANON NPZl20/2MO REY.
IV. SEBTING I-HE CT UNn 1) 3) Hold both ends so that the yellow seal (round) is tothefront,andturnitinthedirectionofthearrow about ten times as shown below. Put the CT unit back into Ihe sloraae case and shake it about ten times in Ihe dlreclion of thc arrow. I Figure 5-16 Shake it in the direction of the arrows about ten times. Figure 5-16 2) Take the CT unit from the storage case, and set it in the copier; thereafter, hold the CT unit in place, and pull the yellow tab straight out.
Periorm the following when relocating the copier by truck or other means of transportation 1 Stw 1 I1 I I I 2 work I Remove the drum unit. Check I Remarks Put the drum unit in a box for transport. Fix the scanner and lens in place. l corona units and feeder unit release lever in place against 4 Tape the front door and delivety unit. 5 Place a sheet of A3 or 11 “X1 7” paper on the copyboard glass, and tape the copyboard cover. 5-14 COPYRIGHT Cj 1992 CANON INC. CANON NPZ,20,2MO WV.
INSTALLATIONW Open the front door, and remove the inside cover. Remove the control panel; see p. 4-4. Turn over the control panel, remove the screw that holds the face lid in place. Remove the face plate. 7 1 @ Holes for mounting screws Figure 5-23 Check that the connector for the printer is found at the center of the hole. \@ 0 Mounting screw 0 Face lid @ Face plate Figure 5-21 5) 6) Remove the protection sheet from the indicator unit of Control Card V.
6) Attach the grounding wire for Control Card V. Note: Keep the grounding wire as far as possible from the DC harness. 10) Connect the 4P connectorof Control Card V and the 4-P connector of the control panel on the copier side. 0 4P connector @ Shorting connector Figure 5-26 @ Grounding wire Q DC harness Figure 5-25 9) Disconnect the shorting connector of the control panel shown in Figure 5-26.
2. NP2120 You may choose to attach the document tray on the side of the left cover. 1. NP2020 1) The document holder may be attached to the left 01 right of thecopier; thefollowing represents attachment of the holder on the left cover side. 1) Fit the mounting screws in the holes shown, and attach the document tray; see Figure 5-30. Remove the two screws of the left cover. Figure 5-30 @ Screws (not used) Figure 5-28 2) Attach the document holder.
i CHAPTER 6 MAINTENANCE AND SERVICING 1. PERIODICALLY REPLACED PARTS .. 6-i l l . CONSUMABLES .................................. 6-2 III. PERIODICALSERVICING ................... 6-3 COPYRIGNT 0 1592 C A N O N I N C . IV. PERIODICALSERVICING C A N O N NPZl2012mO R N . 0 M A Y 1990 PAINTEU IN JAPAN IIMPRIME AU JAPONI CHART.. ....
Some parts of the copier need to be replaced on a periodical basis; those listed below must be replaced regardless of damage or wear, since they can affect the very operation of the machine when they fail. Replace each part during the scheduled visit closest to the life indicated. as of July 1992 7 Developing roll (rear; developing assembly) FS2-6019-000 1 500,000 Note: The above are estimates only and subject to change to reflect data from the field. COPYAIGNT 0 1992 C A N O N I N C .
Some parts of the copier may need replacement overthewarranty period because of wearor damage; replace them when they have failed. as of July, 1992 No. Parts No.
MAINTENANCE AND SERVICING tZZi?B Note: 1. As a rule, conduct the following wok every 20,000 copies. 2. Check the service record before paying a vis%, and take replacement parts if necessary. Work ;tep 1 Checks Meet the operator. Remarks Check the condition. 2 Record the counter reading. Check the faulty copies. 3 Make test copiers; in the DIRECT, REDUCE, ENLARGE, page separation modes. Check the following: a. image for density b. background for dirl c. characters for clarity d.
Note: Do not use solvents or oils other than those specified. A: Clean 0: Replace X: Oil 0: Adjust 0: Check Remarks 6-4 COPYAIGHT %j 1992 C A N O N ING. C A N O N NPZl20/2MO KV.
APPENDIX 1 . 2. 3. 4. 5. 6. 7. 8. GENERAL TIMING CHART.. ................ SIGNALS AND ABBREVIATIONS.. ...... GENERAL CIRCUIT DIAGRAM.. .......... WIRING DIAGRAM ............................... DC CONTROLLER PCB ....................... MOTOR DRIVE PCB ............................ DC POWER SUPPLY PC0.. ................. DC POWER SUPPLY FOR OPTIONS ..................................... COPYRI6HT 0 1992 C A N O N I N C . A-l A-3 A-5 A-6 A-l 1 A-25 A-26 9. 10. 11. 12. 13. 14. ADJUSTING PC0 ...............
2.
TCNTD TH UCPD WCHP WCRP ZXDP TOTAL COUNTER DRIVE command FIXING ROLLER SURFACE TERMPERATURE signa1 UPPER CASSETTE PAPER DETECTION signa1 CORONA WIRE CLEANER HOME POSITION signa1 CORONA WIRE CLEANER REAR POSTION signa1 ZERO COCC DETECTION signa1 Abbreviations AER INTR LSTR SCFW SCRV STBY WMUP WMUPR AE ROTATION INITIAL ROTATION LAST ROTATION SCANNER FORWARD SCANNER REVERSE STANDBY WARM UP WARM UP ROTATION A-4 COPVRIGHT 0 1992 C A N O N ING. C A N O N NP2WJ/ZMO HEY. O E C .
Pl Pl I Jl-2 // Door switch POWER switch J~-l ;w1 sw2 /l 07% 2 V .---- / * Note: o sw3 :~- r (13P) NF J31S(llP) ment referente Documer PI J: Casselle 1 Cassette 2 paper sensor paper sensor papa sensor CANON HPZl20/2MO REY.0 MAY 1990 PRINTEO IN JAPAH IIMPRIME AU JAPONI 0ont:ol Card V J315( icllobv,ving: V ’ b,ll applicable Co 115V, 24OV, and O?OV (ECJR) models. .’ PSi, 2, arncl J3 applicable 10 22OV model. PIi ópplicakks to IOOV model. J314(6P) J316(12P) IJ COPYRIGHT 0 K92 CANON IHC.
: : AOPZ /AOZZ ii : : I PW AS11 ll001 INOdVi flV 3WlUdRII NVdVî NI OUNlHd 0661 81 O'NU OZOZ/OZIZdN HONV3 INI NON\13 2561 0 IH9lUAd03 m x Pr / i p!oua,os uo!leqdde ,!o tqsod awc ! Od 01 / 1 (LO9WlOZOZdN) KWH9WlCl 9NkJlM ‘P 08r l/ 9-v
Er VAV2 SON6 3v NIV33V 5ON3 dH1 AF SON3 VAVZ AZ1 OOxiQ ozsa 0 uo!~myy~ap! az!s waumoa 1 UO!le3!gluap! az!s ~uawn3oa az!s luaum3oa 80Er OZWj EAVZ dH3M GIlN dU3h SON6 SON8 OddS AC 18335 V-OS E-35 3-35 O-35 3-35 dn33S 783Nl & R N 3 &g VN, uq 1apaaj I+~!MS 43J!MS uo!l!sod auJoy uo!gsod ~osuas Jaded ~aueap al!M JEtN JCNJW~3 aJ!w uo!ge~edag 0x1.
WIRING DIAGRAM (NP2020lA603) Motor driver PCB 112 3 415 J402 J201 +g IL,““” DC power supply PC6 DFiSorter DCpowersupply PCS J206 COPYAIGHT D 1992 CANON ING. CANON NPZl20/2CQO AEV.
LL w I n t 0 m a -9zcr :-9zcr
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4 m VAPZ WNF) 3v NIW3V SaN3 dH1 AS SaND VAPZ AZ1 oam ozsa SSEr azwd EAPZ dH3M PONE) dtl3M SCINO SaNE) addS AB 90sr ‘“IU -,. laN3 j n3v : 033 I E- H A 1) SaNO 3ati A5 Oddlnl 5aND AS ad31 saN3 AS adan SaNE) 81Er 6LEr 9061’ X33dO nada *13la *anda *landa *wdnda * alaa3 SaND SaN3 1 1ZEî SoEr pJplE _ _--, - ’ IAH VAPZ E-Eo9r P - E09r 9-Eo9r 9 Eo9r z-PPî i w z-9zr 1 503a EZS3dO tzsna ozsna x3na w3a dOad0 d3dYa ddlla bU,\I?.i z IN11 daxz m lHD1 ZklOc)V ; / VA\PZ amz 1-i z L - 9zr .
APPENDIX W WIRING DIAGRAM (NP2120/A603) Motor driver WI3 DCconfroller Pee 1 J202 DC power supply PCB COPYAIGHT 0 1992 CANON ING. I 24VA NC GNDS 24VB GND24 GND12 12v GND5 5v MMD CANON NPZl20L'MO RN.0 OEC.
m APPENDIX WIRING DIAGRAM (NP2020/A604) 3 b2 I I 1 Wirfng for DF andSoner(DC controllerPCB¡s FG2-2829orFG2.2830) J39 mmmm J817 x 7 7 1 2 3 4 5 6 To A-10 COPYAIGHT 0 1992 CANON ING. 7 8 9 101112 DF CANON NPZl20/2CQO AN.f JAN.
A P P E N D I X bZS3 13. LIST OF SPECIAL TOOLS Special tools which are required for servicing this copying machine (in addition to the standard tool set) are listed below. No. Tool name Tool No. 1 Door switch actuator TKN-0093 A 2 Spring scale (compression) CK-0054 B 3 Cleaning oil Shape ApplicatioriRemarks Code - Measuring cassette spring strength - Adjusting scanner drive cable tension TKN-0464 Note: Rank A: Each serviceman should carry one with him.
APPENDIX 14. LIST OF SOLVENT AND MATERIAL NO. 1 Name Use Ethyl alcohol (Ethanol) Cleaning copyboard glass, mirror. etc. Chemicalformula, mixture ratio. etc. SO”~Cí3 Rema& CzH50H Locally Flammable. Use in a well-ventilated area. Avoid breathing concentrated vapor. Locally Flammable. Use in a well-ventilated area. Avoid breathing concentrated vapor. Avoid contact with eyes orskin. Do not use for cleaning the durm molded plastic parts, or corona vires.
STAL SERVICE MANUAL. COPYAIGHT 0 1592 CANON INC. .’ CANON NP2l20/2020 KV.
br. . ..- “z.ï *~~l,~.d:.~il”~&.~ I-i ‘.T>iL. ,.7m.~zw‘+.. :.,“ii’, , .;G.!,::-: t-..r:... ,_. F.Tmi’,:,<, ,; Cr&, . . _ .., _, .,/ ;,. .., . ._ I. SPECIFICATION _._.__.___<._.._____............... 1-l P II. CROSS-SECTIONALVIEW .___..<..___.__.__ i-2P 1. BASIC CONSTRUCTIONS .._._..<............ 2-l P A. O u t l i n e o f E l e c t r i c a l Circuitry 2-l P B. Inputs to and Outputs from Paper Deck Controller __._.._...._......... 2-2P C. O u t l i n e ..__._.___._.........................
CHAPTER 1 GENERAL DESCRIPTION 1. SPECIFICATION COPYRIGNI 0 1992 C A N O N ING. . . .._.______.................... l-1P I I . CROSS-SECTIONALV~EW ._......________. C A N O N NW,ZO/ZMO KV.
Specifications Item Pick-up Clawless Paper storage Front loading COPY paper type Copy paper size Plain paper (64 to 80 g/n+) A4, LTR Capacity 115 mm (stacked; approx. 1,000 sheets of 80 s/m2) Size switching Plate and Size switch Power supply Dimensions ,115VAC; from copier Weight 28 kg161.7 Ib COPIAIGNI 0 1992 C A N O N I N C 610 (W) x 577 (D) x 429 (H) mm (24.0 (W) x 22.7 (D) x 16.9 (H) in) C A N O N NP2120/ZET BEY.
5!m G E N E R A L D E S C R I P T I O N I 0 u Figure l-201 0 Q @ @I Lifter position sensor Feeder roller Deck pre-registration paper sensor Deck registration roller l-2P COPYRIGNT 0 1992 C A N O N ING. @ Separation roller @ Pick-up roller @ Lifter C A N O N NPZl2012MO KV.
- CHAPTER 2 OPERATIONS AND TIli/lING In outline diagrams,-+represents paths. mechanical drive paths, and = indicates electrical signa1 Signals in digital circuits are identified as ‘1’ for High and ‘0’ for Low. The voltage of signals, however, depends on the circuít. Nearly all operations of the copíer are controlled by microprocessors; the interna1 workings of these processors are not relevant to the serviceman’s work and, therefore, left out of the discussions.
1. BASIC CONSTWUCT~ON A. Outline of Electrical Circuitry The paper deck pedestal is controlled by signals from its host copier and from its own controller. The copier sends signals as programmed in advance to the controller inside the pedestal. In response to the signals from the copier and from its own microswitches and sensors, the pedestal3 controller generates signals to drive iti motor and clutches. Figure Z-201 is a block diagram showing the relationship among the pedestal3 majar circuits.
OPERATIONS AND TIMING B. lnputs to and Outputs from Paper Deck Controller (1/2) papar dech contrclller PCB r----i 57 J80 J 3 2 2 DCcontro,,erPCB I w- SIZO SI21 DKEX Oscil!ation signa, 57 6 -: P D P 1 Wh.sn paper is presenf in deck. ‘1’. P D P 2 When C?ZZ detecb papr, ‘1‘. -7 - 8 L T D Whsn Q23 dstects ,iffet, ‘1’. - 9 53 - 1 777 J C D When ‘0’. CL1 toes ON. - 4 -:Li‘ C D 15 -e 6/ -7 1’ S Vhen ‘0’. CL2 goes ON. D When ‘V. SLI goes ON. I CD When ‘0’. CL3 goes ON.
OPERATIONS ANDTIMING B. Inputs to and Outputs from Paper Deck Controller (2/2) Paper deck controller PCS Jl - 1 I r - - ~ - I DC controller PCS lDMD When’O’. Mi goes ON. switch DOP When right door is closed and deck is set, ‘1’. L Figure COPYRIGNT 0 1992 CANON ING. 2-203 CANON NP2,20,2@0 mV.
C. Outline The paper deck motor (MI) serves to raise the lifterand drivethe pick-up, separation , and registration rollers. The paperdeck motor is controlled by the signals from the copying machine as well as from sensors and switches by way of the paper deck controller PCB. The lifterlowers on itsown weightwhen thepaper deck is pulled out, releasing the gears. Paperdecl
O P E R A T I O N S ANDTLMING m D. Pick-up and Feed Operations The paper deck picks up and feeds the paper in response to the signats from the copying machine. The paperdeck motor (Msdriven in response to the deck motor drive (DMD) signa1 from the copying machine; drive is then transmitted to the pick-up and registration rollers by way of clutches. The clutches in turn are under control of the signals from the copying machine.
OPERATIONSANDTIMING (1) Sequence of Pick-up and Feed Operations COPY S T A R T key ON Figure 2-206 24P COPYAIGHT 0 1932 CANON ING. CANON NPZl20/2MO RN.
OPERATIONSANDTIMING a 1. Releasing the Pick-Up Roller E. Releasing the Pick-Up and Separation Rollers The paperdeck isof a front loading type; as such, the deck is pulled out for a supply of paper. When the deck is pulled out, the pick-up and separation rollers are released; this design facilitates positioning of the deck and clearing of jams The pick-up roller is released as soon as the grip of the deck is pulled.
EEN33 OPERATIONS AN,,TlMlNG be,.,>...;..; p G-7 .‘.,., :.',^>"q ,.I. :. iI -,.i . . . . . > i _ ,c 2. Releasing the Separation Roller Theseparation rolleris releasedwhen thecamon the deck side plate comes off the release lever roller. Releare Iwer lease leve, ler Figure z-208 Figure 2-209 2-8P CDPYRIGHT @ 1992 CANOA INC. CANON NPZl20/2GZO EV.
CHAPTER 3 MECHANICAL SYSTEM 1. II. PICK -UP AND FEEDER SYSTEMS ____ 3-1 P DRIVE SYSTEM . . . . . . .._____...................... 3-4P III. IV. COPYRIGNI 0 1992 CANON INC., ADJUSTING THE REGISTRATION (FRONT, REAR) . . . . . . . ..____...................... 3-5P M O D I N I N G T H E DEC SIZE . . . . 3-7P CANON NPZlZO/ZMO RN.
M E C H A N I C A L S Y S T E M KZZ? 3) Detach the deck from the front. - Slide it out to the front until it stops; detach it as if to lift it. Li. Pick-Up Roller 1) Remove the rear cover from the pedestal. Figure 3-203 4) RemovetheE-ring, anddetachthepick-uproller (front);thereafter, pulloutthepick-uproller(rear) together with its shaft. @ Mounting screw @ Rear cover of pedestal Figure 3-201 2) Remove the deck stopper plate.
m MECHANICALSYSTEM B. Feed Roller C. Separation Roller 1) Detach the deck. 2 ) Removethestopring,anddetachthefeedroller. 1) Slide out the deck. 2) Open the right door of the pedestal. 3) Remove the two stop rings, and detach the separation roller. @ Stop ring (front) @ Stop ring (rear) Figure 3-207 @ Feed roller 0 Stop ring Figure 3-205 Note: Take care; the feed roller has its own orientation. Figure 3-206 3-2P CopynIGHT 0 1932 CANON ING. CANON NP2120/2MO NB.
MECHANICALSYSTEM D. Registration Roller 1 ) Detachthedeckdriveunit;seethediscussionon removing the deck drive unit. See p. 3-4P. 2) Remove the E-ring at the rear and the spring. @ E-ring 0 Springs Figure 3-208 3) Remove the E-ring at the front, and detach the gear; thereafter, detach the registration roller. 0 E-ring Q Spring @ Gear @ Registration roller Figure 3-209 COPYAIGHT 0 1592 CANON INC. CANON NR,ZO/ZWO RN.
si. RWE SYSTE 6) Detach the right door from the pedestal A. Deck Drive Unìt 1) Detach the right cover and right door from the copier. 2) Detach the rear cover from the pedestal. 3) Remove the four connectors and two fastons from the paper deck PCB. @ Strap Q Right door of pedestal Figure 3-212 7) Remove the four mounting screws, and pull the deck drive unit to the front to detach. @ Connectors (Ji, J2, J3, J4) @ Fastons Figure 3-210 4) Detach the deck stopper plate, and pull out the deck.
MECHANICALSYSTEM m A. Making Adjustments 1) Slide out the deck. The registration at the front and rear for the pedestal should be as shown in Figure 3-214. Iftheregistrationisotherwise, makethefollowing adjustments. Figure 3-215 Figure 3-214 2) Loosen the four mounting screws on the front cover and the four mounting screws on the grip plate. Mounting screws Grip plate Grip plata Mounting screws for Iront caver Figure 3-216 COPYRIGNI 0 1992 CANON ING. C A N O N NPZl20/2070 RN.
B MECHANICALSYSTEM 3) Slide the grip plate in parallel to the body, and adjust the registration at the front and rear. 6) Make copies using the paper deck. 7) Repeat steps3) to 6) if the registration is outside the standards. 8) Fix the front cover so that the gap between the front cover and pedestal frame is about 0.5 mm. 0.5 mm (approx.) Decrease the non-image width a, lhe front; increases he nonimage widh at the rear.
MECHANICALSYSTEM Thepaperdeckcan bemodifiedtosuit thesizeof the paper to be used (A4 or LTR) by relocating the three partitions and resetting the DIP switch. 3) Detach the three partitions. 4) Fit the partitions into the holes corresponding to the desired size. n Use a sheet of thedesired size as referente to facilitate the work. Modifying the Deck Size LTR TA4 A4 1) Detach the rear cover from the pedestal. 2) Detach thestopper plate, and take out the deck. LTR.
CHAPTER 4 MAINTENANCE AND SERVICING 1. II. PARTS TO BE REPIACED PERIODICALLY _.........__._...................... 4-1 P CONSUMABLES __._......____.................... 4-i P COPYRIGNT 0 1992 CdNON ING. III. PERIODICALSERVICING CHART . . . . . . . . .._.______............................... CANON NP2l20,2WO R N .
MAINTENANCEANDSERVICING M There are no parts in the Paper Deck pedestal which must be replaced periodically I I . CQN%UMABEES The table below shows the average life (in terms of estimated number of copies) of parts that may require replacement at least once within the warranty period dueto deterioration, wear, or damage. as of March 26, 1990 No. Parts No.
APPENDIX 1. II. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS.. .................... A-l P VARIABLE RESISTOR (VR), LED, AND CHECK PIN BY PCB .................... A-3P COPYAIGHT 0 1952 CANON ING. III. DC CONTAOLLER ................................ A-5P CANON NPZlZO/ZMO KV.
APPENDIX COPYRIGNT 0 1992 C A N O N I N C CANDN NPz120/2020 MV.
Symbol Name Photointerrupter PS PI 021 Q22 Q23 Microswitch MS1 MS2 Function .Paper sensor Pre-registration sensor Lifter position sensor Upper limit switch Door openlclosed switch 0 M Motor Ml CL Clutch CL1 CL2 CL3 Lifter clutch Pick-up clutch Registration roller clutch Solenoid SLI Pick-up roller release solenoid 0 Pedestal driver PCB A-2P Notation COPYRIGHT 0 1542 C A N O N ING. 0 Deck motor Drives each load in the pedestal. C A N O N NPZl20/2RZO R N .
Discussion will be limited to thevariable resistors (VR), LEDs, and checkpins that can be used in the field from among those the copying machine is equipped with. Those not discussed are for adjustment at the factory only, and adjustments and checks using them call for special tools and instruments as well as high accuracy. Do not touch them in the fields. Note: 1. Some LEDs emit light even when OFF because of leakage current. 2. VRs that may be used in the field . . . . . . . . . . . . . . . . . . . . . .
Prepared by COPYING MACHINE TECHNICAL INFORMATION DEPT. COPYING MACHINE TECHNICAL INFORMATION DIV. CANON INC. Prlnted In Japan REVISION 0 (MAY 1990) [26313] REVISION 1 (JAN. 1992) 1263131 REVISION 2 (DEC.
The printing paper contains 70% reused paper. I /< C.. PAINTEO IN JAPAN (IMPRIME AU JAPONI 12m2.
