Service manual

ManualsBrandsSharp ManualsComputer equipmentLC-20VM2E

LC-20VM2

LC-121M2E

LC-150M2E

S10V7LC20VM2U

SERVICE MANUAL

LC-20VM2

LCD AV MONITOR

In the interests of user-safety (Required by safety regula-

tions in some countries) the set should be restored to its

original condition and only parts identical to those specified

be used.

CONTENTS

Page

1. IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................... 2

2. SPECIFICATIONS ................................................................................................................................... 4

3. PART NAMES .......................................................................................................................................... 5

4. OUTLINE DIMENSION FIGURE .............................................................................................................. 6

5. REMOVING THE MAIN PARTS ............................................................................................................... 7

6. LC-20VM2 ADJUSTING METHOD .......................................................................................................... 9

7. INTEGRATED CIRCUIT TERMINAL ARRANGEMENTS ........................................................................ 21

8. TROUBLE SHOOTING ............................................................................................................................ 30

9. CHASSIS LAYOUT .................................................................................................................................. 33

10. SCHEMATIC DIAGRAMS ........................................................................................................................ 38

11. BLOCK DIAGRAM ................................................................................................................................... 54

12. PRINTED WIRING BOARD ASSEMBLIES .............................................................................................. 56

13. PARTS LIST ............................................................................................................................................. 65

14. PACKING OF THE SET ........................................................................................................................... 81

MODEL

SERVICE MANUAL LCD AV MONITOR

MODEL LC-20VM2

This document has been published to be used for

after sales service only.

The contents are subject to change without notice.

SHARP CORPORATION

LC-20VM2

This service manual is for the USA, CANADA, MEXICO models.

Summary of content (72 pages)

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LC-121M2E LC-150M2E LC-20VM2 LC-20VM2 SERVICE MANUAL S10V7LC20VM2U SERVICE MANUAL LCD AV MONITOR MODEL LC-20VM2 LCD AV MONITOR In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified be used. CONTENTS MODEL LC-20VM2 Page 1. IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................... 2 2. SPECIFICATIONS ............
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LC-20VM2 LC-121M2E LC-150M2E 1. IMPORTANT SERVICE SAFETY PRECAUTION æ Service work should be perfomed only by qualified service technicians who are thoroughly familiar with all safety checks and servicing guidelines which follow: Any reading of 0.3V RMS(this corresponds to 0.2 milliamp. AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner. WARNING 1. For continued safety, no modification of any circuit should be attempted. 2.
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LC-121M2E LC-150M2E LC-20VM2 1. PRECAUTIONS A PRENDRE LORS DE LA REPARATION Æ Ne peut effectuer la réparation qu’ un technicien spécialisé qui s’est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT Il faut répéter les vérifications en inversant la connexion de la fiche de l'adaptateur CA (S'il y a lieu, utilisez une fiche non polarisée pour seulement compléter ces vérifications.) Une valeur de 0,3 V RMS ou plus (correspond à 0,2 mA C.A.
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LC-20VM2 LC-121M2E LC-150M2E 2. SPECIFICATIONS Type: Size: Display System: Driving System: Number of Picture Elements: Speaker Output: Speaker: LCD display unit (LCD color AV monitor) 20" type (298.8 mm × 401.3 mm) Transmitting type TN liquid crystal panel. TFT (Thin Film Transistor) active matrix system 921,600 (640 (H) × 3 (RBG) × 480 (V)) 4.0 W (Front 0.7W + 0.7W, Rear 2.
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LC-121M2E LC-150M2E LC-20VM2 3.
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LC-20VM2 LC-121M2E LC-150M2E 4.
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LC-121M2E LC-150M2E LC-20VM2 5. REMOVING THE MAIN PARTS 1. 2. 3. 4. Remove the four main PWB fixing screws. Remove the three inverter PWB fixing screws. Remove the four RGB terminal PWB fixing screws. Remove the one terminal PWB fixing screw and 1 earth fixing screw to remove the reinforcing plate. 5. Remove the two LCD unit fixing screws. 6. Remove the three operation PWB fixing screws.
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LC-20VM2 LC-121M2E LC-150M2E • Caution for handling the LCD panel 1. Work in a clean room. (Humidity: 50% or more) 2. A worker must wear arm bands. 3. Work on a conductive mat. 4. Do not expose the unit to shock such as fall or vibration. 5. Use an ionizer. (within 30 cm) 7. Remove the four LCD unit front fixing screws and four rear fixing screws to remove the shield plate. 8. Remove the two reflection sheets. 9. Remove the upper and lower fluorescent tubes. 10. Remove the light guide plate. 11.
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LC-121M2E LC-150M2E LC-20VM2 6. LC-20VM2 ADJUSTING METHOD The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust as follows. 6-1. Preparation for adjustment (1)Use the exclusive-use AC adapter or stable DC power supply. AC adapter: UADP-0214CEZZ DC power supply: 13 (V) 5(A) (Total of the triple power supply) 6-2.
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LC-20VM2 LC-121M2E LC-150M2E 6-4.
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LC-121M2E LC-150M2E Page 4 LC-20VM2 Adjusting range Item Minimum Maximum PAL-M BRIGHTNESS 0 255 PAL-M UNICOLOR 0 127 PAL-M SCOLOR 0 31 PAL-M TINT 0 127 PAL BRIGHTNESS 0 255 PAL UNICOLOR 0 127 PAL SCOLOR 0 31 PAL TINT 0 127 SECAM BRIGHTNESS 0 255 SECAM UNICOLOR 0 127 SECAM SCOLOR 0 127 SECAM TINT 0 127 Initial 130 50 24 62 130 50 19 62 130 80 75 58 Remarks 5 DVD 60 BRIGHTNESS DVD 60 UNICOLOR DVD 60 COLOR DVD 60 TINT DVD 50 BRIGHTNESS DVD 50 UNICOLOR DVD 50 COLOR DVD 50 TINT DVD 60 R-Y PHASE DVD 60 B-Y P
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LC-20VM2 Page 8 9 10 11 LC-121M2E LC-150M2E Item N358 R-Y PHASE N358 B-Y PHASE N443 R-Y PHASE N443 B-Y PHASE PAL-M R-Y PHASE PAL-M B-Y PHASE PAL R-Y PHASE PAL B-Y PHASE SECAM R-Y PHASE SECAM B-Y PHASE COLOR SCONT SPEED PARITY TIME OUT Adjusting range Minimum Maximum Initial 0 3 2 0 3 1 0 3 2 0 3 1 0 3 2 0 3 1 0 3 2 0 3 1 0 3 2 0 3 1 0 127 60 0 31 18 0 Remarks FF 9600 NONE 0 ON/OFF ON/OFF GAMMA TEST AV V0 AV V0 BIAS AV V16 AV V16 BIAS AV V32 AV V32 BIAS AV V48 AV V48 BIAS AV V63 AV V63 BIAS 0 0
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LC-121M2E LC-150M2E LC-20VM2 6-6. Service Adjusting 6-6-1. Main chassis adjustment Adjustment 1 +B Adjustment (+B ADJ Item) Adjusting conditions 1. Connect the DC voltmeter to TP1101 Adjusting method 1. Adjust the DC/DC 5V line output voltage so as to get 5.0±0.05V. (DAC 16ch ) 2 3 Setting (MODEL) MODEL V2U (SYSTEM) SYSTEM AUTO (COPY GUARD) (MASK) COPY GUARD MASK ON OFF Counter-bias adjustment (COM Item) 1. Set the AV1 mode to set signal noninput state. 1.
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LC-20VM2 3 LC-121M2E LC-150M2E Adjustment B CUTOFF adjustment (B CUTOFF Item) Adjustment conditions 1. Input the NTSC standard color bar to AV1. 2. Connect CH1 of the oscilloscope to TP821 (IC316, pin7, G output). 3. Connect CH2 of the oscilloscope to TP820 (IC316, pin1, B output). 1. Input the NTSC standard color bar to AV1. 2. Connect the oscilloscope to TP821 (IC316, pin7, G output). Adjustment method 1. Adjust B CUTOFF so as to equalize the black levels of green and blue.
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LC-121M2E LC-150M2E LC-20VM2 6-6-3. PAL signal adjustment Adjustment 1 PAL/SECAM OSC adjustment Adjustment conditions 1. Input the PAL standard color bar to AV1. Adjustment method 1. Adjust PAL/SECAM OSC so that the screen becomes clear. (PAL/SECAM OSC) 2 Brightness adjustment (PAL BRIGHTNESS) 1. Input the PAL standard color bar to AV1. 1. Adjust PAL BRIGHTNESS, and adjust the black level of G output 2. Connect oscilloscope to TP821 so as to get DC 0.35±0.05V. (IC316, pin7, G output).
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LC-20VM2 LC-121M2E LC-150M2E 6-6-4. SECAM signal adjustment Adjustment Adjustment conditions Adjustment method 1 BELL f0 adjustment (BELL F0) 1. Connect the oscilloscope to TP2851. 1. Adjust BELL f0 so that the level of a becomes the minimum. 2 Brightness adjustment (SECAM BRIGHTNESS) 1. Input the SECAM standard color bar 1. Adjust SECAM BRIGHTNESS, and to AV1. adjust the black level of G output to 2. Connect oscilloscope to TP821 DC 0.35±0.05V. (IC316, pin7, G output).
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LC-121M2E LC-150M2E LC-20VM2 6-6-6. N443, PAL-M signal adjustment (Actual adjustment manipulation is unnecessary because PAL data is copied by the data copy manipulation of the former term. Adjusting conditions Adjusting method 1 Brightness adjustment (N443, PAL-M BRIGHTNESS Item) Adjustment 1. Input the NTSC standard color bar to AV1. 2. Connect oscilloscope to TP821 (IC316, pin7, G output). 1. Adjust N443 BRIGHTNESS, and adjust the black level of G output so as to get DC 0.35±0.05V.
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LC-20VM2 LC-121M2E LC-150M2E 6-6-7. Component (50/60Hz) input adjustment Adjustment Adjusting conditions Brightness adjustment 1. From SG, input the 100% white color (DVD 50/60 BRIGHTNESS bar signal of PAL into conponent Item) terminal. 2. Connect oscilloscope to TP821 (IC316, pin7, G output). Adjusting method 1. Adjust DVD 50/60 BRIGHTNESS, and adjust the black level of G output so as to get DC 0.35±0.05V. 2 Unicolor adjustment (DVD 50/60 UNICOLOR Item) 1. Adjust DVD 50/60 UNICOLOR so as to get 2.
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LC-121M2E LC-150M2E LC-20VM2 Adjustment Adjusting conditions RGB Contrast adjustment 1. Input the test pattern to RGB. (RGB CONTRAST Item) 2. Connect the oscilloscope to TP821 (IC316, pin7, G output). Adjusting method 1. Adjust RGB CONTRAST so as to get 2.5±0.1Vp-p between the 100% white and GND. 5 RGB R DRIVE adjustment (RGB R DRIVE Item) 1. Input the test pattern to RGB. 2. Connect CH1 of the oscilloscope to TP821 (IC316, pin7, G output). 3.
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LC-20VM2 LC-121M2E LC-150M2E (2)PAL finished adjustment Adjustment 1 Adjusting conditions Black level adjustment (The 14th-page PAL BRIGHTNESS Item) Adjusting method 1. Set is set in the compulsion PAL 1. It confirms that the third gradation is mode. a cut-off point from the left of the 2. A JA-5CH signal is displayed. gradation pattern. (3)DATA Copy A sound volume key is manipulated in accordance with the data copy item.
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LC-121M2E LC-150M2E LC-20VM2 7. INTEGRATED CIRCUIT TERMINAL ARRANGEMENTS 7-1. IC2001 (QFP, 80pins) MICRO CONTROLER Terminal No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 Terminal name N. C N. C SCL SDA HP DET DCLK DOUT DIN FS MUT RS MUT N. C N. C CSYNC KEY1 REQ GAEN MRDY SIN SCLK SOUT 1 VIN 5 VIN SCAN LMUTE N. C N. C CNV s s φ RESET Xin Xout Vss STB POWOUT COCS DA1CS DA2CS 232CCS N. C N.
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LC-20VM2 Terminal No. 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 LC-121M2E LC-150M2E Terminal name PALM N. C N. C N. C B/W N. C N. C N. C PSWIN L_ERR KEY3 KEY4 BLK HPMUTE N. C N. C B OUT G OUT R OUT Vsync Hsync N. C Vcc N. C OSCI N. C N. C IRQ KEY2 IREM N. C I/O O – – – O – – – I I I I O – – O O O I I – I – Function “H” in PALM mode, “L” in other modes.
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LC-121M2E LC-150M2E LC-20VM2 7-2. IC1201 LCD CONTROLER Terminal No.
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LC-20VM2 LC-121M2E LC-150M2E Terminal No.
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LC-121M2E LC-150M2E LC-20VM2 Terminal No.
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LC-20VM2 LC-121M2E LC-150M2E 7-3. IC7001 (100pin, QFP) 3D Y/C Terminal No.
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LC-121M2E LC-150M2E LC-20VM2 Terminal No.
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LC-20VM2 LC-121M2E LC-150M2E Terminal No. 95 96 97 Symbol I/O Level VRBC ACI AGND O I - Analog Analog - Buffer Type PU/PD[kΩ] Function C-ADC bottom reference voltage output C-ADC analog C signal input C-ADC ground 7-4. IC4101 (128pin, QFP) Pin No.
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LC-121M2E LC-150M2E Pin No. 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 LC-20VM2 PAD 72 73 74 75 76 77 78 79 80 81 82 83 84 ** ** ** ** 85 86 87 88 89 Pin Name RDLIN4 RDLIN5 RDLIN6 RDLIN7 ETWEN GNIN0 GNIN1 GNIN2 GNIN3 GNIN4 GNIN5 GNIN6 GNIN7 * * * * * * * * VSS (GND) GDLIN0 GDLIN1 GDLIN2 GDLIN3 I/O TYPE I I I I O I I I I I I I I * * * * P I I I I I/O CELL IBC IBC IBC IBC UO2 IBC IBC IBC IBC IBC IBC IBC IBC ** ** ** ** VSS IBC IBC IBC IBC I/F CELL PDVN 29 Pin No.
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LC-20VM2 LC-121M2E LC-150M2E 8. TROUBLE SHOOTING Fluorecent lamp failure to light up. No picture, No sound Do F702 and F703 function? NO Does F7751 function? NO Replace F7751. YES YES Are T701's secondary outputs, +30V, +9V, +5.0V and -8V normal? NO Is T701's primary oscillator waveform normal? Remove F702 and F703, and check the load side. Is there short-circuiting? NO Is the pin 11 of IC1201 in the "H" state? YES NO Check IC1201, IC1206, IC2001 and their peripheral parts.
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LC-121M2E LC-150M2E LC-20VM2 No sound Does not output from the front YES Is the pin 9 of IC2001 in the "L" state? YES NO Muted. Check the FSMUT line. Is output at pins NO Check IC308, 1 and 7 of IC316 and their IC316 normal? peripherals. YES Does not output from the rear YES Does not output from the headphones YES Does not output from the line output YES Is the pin 10 NO Muted. Check the RSMUT line.
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LC-20VM2 LC-121M2E LC-150M2E No colour appears (N358) No colour appears (N443,PAL) No colour appears (PAL-M) No colour appears (SECAM) Is 3.5795 MHz NO Check X801 and its peripheral input into the parts. pin 10 of IC801? YES Is 4.4336 MHz NO Check X802 and its peripheral input into the parts. pin 8 of IC801? YES Is 3.5756 MHz NO Check X803 and its peripheral input into the parts. pin 9 of IC801? YES Is 4.
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LC-121M2E LC-150M2E LC-20VM2 9.
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LC-20VM2 LC-121M2E LC-150M2E RGB UNIT J I H INVERTER UNIT G 6.3 F E SW UNIT D TERMINAL UNIT C B 2.5 3.
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LC-121M2E LC-150M2E LC-20VM2 • WAVEFORMS 1 500mV/div 4 1V/div 10µs/div 10µs/div 7 500mV/div 10µs/div 2 1V/div 10µs/div 3 1V/div 10µs/div 5 1V/div 10µs/div 6 1V/div 10µs/div 8 1V/div 10µs/div 9 2V/div 10µs/div 35
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LC-20VM2 LC-121M2E LC-150M2E • DESCRIPTION OF SCHEMATIC DIAGRAM 1. When the exclusive-use AC adapter is used, the color bar signal of color bar generator for service is input to get the normal screen. When the audio is minimized, the voltage value is measured with the 20 kΩ/V tester. 2. When the exclusive-use AC adapter is used, the color density, lightness and color hue are set to the center position, and the signal of colour bar generator for service is observed to get waveform.
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LC-121M2E LC-150M2E LC-20VM2 -MEMO- 37
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LC-20VM2 LC-20VM2 10.
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LC-20VM2 LC-20VM2 MAIN (2) CIRCUIT SCHEMATIC DIAGRAM å AND SHADED COMPONENTS=SAFETY RELATED PARTS J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 40~41 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 MAIN (3) CIRCUIT SCHEMATIC DIAGRAM J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 42~43 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 SCAN CIRCUIT SCHEMATIC DIAGRAM J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 44~45 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 YC CIRCUIT SCHEMATIC DIAGRAM J I H RESET G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 46~47 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 TERMINAL CIRCUIT SCHEMATIC DIAGRAM å AND SHADED COMPONENTS=SAFETY RELATED PARTS J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 48~49 12 13 14 15 16 17 18 19 20
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LC-20VM2 INVERTER CIRCUIT SCHEMATIC DIAGRAM å AND SHADED COMPONENTS=SAFETY RELATED PARTS J I H G F E D C B A 1 2 3 4 5 6 50 7 8 9 10
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LC-20VM2 SW CIRCUIT SCHEMATIC DIAGRAM J I H G F E D C B A 1 2 3 4 5 6 51 7 8 9 10
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LC-20VM2 LC-20VM2 RGB CIRCUIT SCHEMATIC DIAGRAM J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 52~53 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 11.
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LC-20VM2 LC-20VM2 12.
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LC-20VM2 LC-20VM2 MAIN PWB UNIT (Wiring Side) J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 58~59 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 TERMINAL PWB UNIT Component Side J I H G F Wiring Side E D C B A 1 2 3 4 5 6 7 8 9 10 11 60~61 12 13 14 15 16 17 18 19 20
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LC-20VM2 LC-20VM2 INVERTER/SW/RGB PWB UNIT SW PWB UNIT Component Side INVERTER PWB UNIT Component Side J I Wiring Side H G RGB PWB UNIT Component Side F Wiring Side E D Wiring Side C B A 1 2 3 4 5 6 7 8 9 10 11 62~63 12 13 14 15 16 17 18 19 20
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LC-20VM2 -MEMO- 64
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 ★ Description 13. PARTS LIST Part No. Code Ref. No. PartLISTE No. ★ Description 13. DES PIECES Code PARTS REPLACEMENT CHANGE DES PIECES Replacement parts which have these special safety characteristics identified in this manual: electrical components having such features are identified by “ å ” and shaded area in the Replacement Parts Lists and schematic diagrams.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description Code Ref. No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 ★ Part No.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description Code Ref. No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 Part No. ★ Description Code Ref. No.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 Part No. ★ Description Code Ref. No.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description Code Ref. No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 Part No. ★ Description Code Ref. No.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description Code Ref. No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 ★ Part No. Description Code Ref. No.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E ★ Part No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 ★ Part No. Description Code Ref. No. DUNTKA094DE01 SW PWB UNIT(Continued) R4023 R4024 R4025 R4026 R4027 R4028 R4029 VRS-CY1JF183J VRS-CY1JF183J VRS-CY1JF472J VRS-CY1JF472J VRS-CY1JF820J VRS-CY1JF331J VRS-CY1JF104J J J J J J J J 18k 18k 4.7k 4.7k 82 330 100k 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W Metal Oxide Metal Oxide Metal Oxide Metal Oxide Metal Oxide Metal Oxide Metal Oxide Part No.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description Code Ref. No.
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LC-121M2E LC-150M2E LC-20VM2 EXPLODED Ref. CABINET No. Part No. ★ VIEW Description Code Ref. No. ★ Part No.
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LC-20VM2 LC-121M2E LC-150M2E • Ref. About wireDescription (No.311112~311163) No.the orthopedics Part No. of lead ★ Code Ref. No. Part No. ★ Description Code Give me caution referring to the bottom figure for the orthopedics of lead wire when you take the set of the applicable number by the repair and so on. 71 Terminal cover Stopped with the both sides tape. Core Cover and terminal PWB with the tape, stopped. Terminal PWB Binding wire band Core Core 1 turns under the P701 connector.
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LC-121M2E LC-150M2E LC-20VM2 Ref. No. Part No.OF THE ★ Description 14. PACKING SET Code Ref. No. Part No. TCAUZ1034CEZZ (A method manual to have) ★ Description Code ★SPAKF0395CEZZ (Packing Add.)(Top) ★SPAKF0396CEZZ (Packing Add.
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LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description - M E MRef. O No. - Code 82 Part No.
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LC-121M2E LC-150M2E Ref. No. LC-20VM2 Part No. ★ Description Code Ref. No. 83 Part No.
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LC-20VM2 LC-20VM2 Ref. No. LC-121M2E LC-150M2E Part No. ★ Description Code Ref. No. ★ Part No. Description Code COPYRIGHT C 2000 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.