Service manual

ManualsBrandsSharp ManualsComputer equipmentMD-MT161E

MD-MT15/15C/15H/15W/161E/18H

– 1 –

Page

SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT15W/15H/18H/161E ONLY) ..................................................... 2

SPECIFICATIONS ................................................................................................................................................................. 3

NAMES OF PARTS ............................................................................................................................................................... 4

OPERATION MANUAL .......................................................................................................................................................... 5

QUICK GUIDE (MD-MT15 ONLY) ......................................................................................................................................... 8

DISASSEMBLY .................................................................................................................................................................... 10

NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 11

TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 11

VOLTAGE ............................................................................................................................................................................ 12

BLOCK DIAGRAM ............................................................................................................................................................... 13

SCHEMATIC DIAGRAM ...................................................................................................................................................... 14

WIRING SIDE OF P.W.BOARD ........................................................................................................................................... 17

WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 22

PARTS GUIDE/EXPLODED VIEW

PACKING OF THE SET (MD-MT15 FOR U.S.A. ONLY)

PACKING METHOD (MD-MT161E ONLY)

SERVICE MANUAL

SHARP CORPORATION

No. S7946MDMT15//

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

MD-MT15(S)

MD-MT15C(S)

MD-MT15H(RD)

MD-MT15H(S)

MD-MT15W(S)

MD-MT161E(S)

MD-MT18H(GR)

• In the interests of user-safety the set should be restored to its

original condition and only parts identical to those specified be

used.

Illustration: MD-MT15/15C

Illustration: MD-MT15H/15W

Illustration: MD-MT161E/18H (Only printing is different.)

CONTENTS OF MD-MT15/15C/15H/15W/161E/18H

The machine MD-MT15/MT15C/MT15W is a modification of

MD-MT20/MT20C/MT20W the difference is the Top Cabinet.

Its performance and operation are identical with those of MD-

MT20/MT20C/MT20W. For details refer to the service manual

(No.S6943MDMT20//) for MD-MT20/MT20C/MT20W.

MD-MT20/MT20C/MT20W

Page

REMOVING AND REINSTALLING THE MAIN PARTS 11

ADJUSTMENT .............................................................. 12

TROUBLE SHOOTING ................................................. 37

FUNCTION TABLE OF IC ............................................ 40

CIRCUIT DESCRIPTION .............................................. 42

The machine MD-MT15H/MT161E/MT18H is a modification

of MD-MT20H/MT16E the difference is the Top Cabinet. Its

performance and operation are identical with those of MD-

MT20H/MT16E. For details refer to the service manual (No.

S5933MDMT20H/) for MD-MT20H/MT16E.

MD-MT20H/MT16E

Page

REMOVING AND REINSTALLING THE MAIN PARTS .. 9

ADJUSTMENT .............................................................. 10

TROUBLE SHOOTING ................................................. 35

FUNCTION TABLE OF IC ............................................ 38

CIRCUIT DESCRIPTION .............................................. 40

Summary of content (32 pages)

PAGE 1
MD-MT15/15C/15H/15W/161E/18H SERVICE MANUAL No. S7946MDMT15// MD-MT15(S) MD-MT15C(S) MD-MT15H(RD) MD-MT15H(S) MD-MT15W(S) MD-MT161E(S) MD-MT18H(GR) Illustration: MD-MT15/15C • In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used. Illustration: MD-MT15H/15W Illustration: MD-MT161E/18H (Only printing is different.) The machine MD-MT15H/MT161E/MT18H is a modification of MD-MT20H/MT16E the difference is the Top Cabinet.
PAGE 2
MD-MT15/15C/15H/15W/161E/18H SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT15W/15H/18H/161E ONLY) Precaution to be taken when replacing and servicing the Laser Pickup. The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements. However, the following precautions must be observed during servicing to protect your eyes against exposure to the laser beam.
PAGE 3
MD-MT15/15C/15H/15W/161E/18H FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS MD-MT15H MD-MT15/15C ■ General Power source: Power source: DC 5V: DC 3.0V: DC 2.4V: DC 4.5V: AC adaptor (AC 120V, 60 Hz) Commercially available, “AA” size (LR6), alkaline battery x 2 Optional Rechargeable Nickel-Metal Hydride battery (AD-T20BT) x 1 Optional car adaptor, AD-CA20X (for cars with a 12-24V DC negative ground electrical system) Power consumption: 7.
PAGE 4
MD-MT15/15C/15H/15W/161E/18H NAMES OF PARTS Illustration: MD-MT15/15C 1. Monaural Long-Play Mode Indicator 2. Record Indicator 3. Level Meter 4. Fast Play Indicator 5. Repeat Indicator 6. TOC Indicator 7. Battery Indicator 8. Random Indicator 9. Track Number Indicator 10. Character/Time Information Indicator 11. Synchro Recording Indicator 12. Disc Mode Indicator 13. Disc Name Indicator 14. Track Name Indicator 15. Remaining Recording Time Indicator 16.
PAGE 5
POWER SOURCE –5– (MD-MT18H) AC 120V, 60 Hz AC 220-230V, 50/60 Hz ● AC adaptors of MD-MT15H/15W/161E are option parts. Insert securely, all the way in. To the DC IN 5V socket Insert securely, all the way in. To the DC IN 5V jack (MD-MT15/15C) Notes: ● When there is thunder or lightning in your vicinity, unplug the AC adaptor from the AC outlet. ● When the unit is not in use for extended periods, remove the AC adaptor from the AC outlet. ● Never use an AC adaptor other than the one specified.
PAGE 6
When the battery level is very low –6– ● Shortly after turning on a heater. ● When the unit is placed in a room where there is excessive steam or moisture. ● When the unit is moved from a cool place to a warm place. When the unit has condensation inside, the disc signals cannot be read, and the unit may not function properly. ● If this happens, remove the disc. The condensation should evaporate in approximately 1 hour. The unit will then function properly.
PAGE 7
When the remaining recording time of a disc is displayed, short tracks less than 12 seconds long may not be included in the total. For MiniDiscs on which repeated recording and editing operations were performed, the COMBINE function may not work. A cluster (about 2 seconds) is normally the minimum unit of recording. So, even if a track is less than 2 seconds long, it will use about 2 seconds of space on the disc.
PAGE 8
● AC Adaptor x 1 ● Adaptador de CA x 1 –8– 2 1 2 3 ■ Rechargeable battery power (Separately available) ■ Alimentación de la batería recargable (Disponible por separado) 1 3 4 • AC 120V, 60Hz • 120V CA, 60Hz ● Analog Cable x 1 ● Cable analógico x 1 ■ Alkaline battery power (Commercially available) ■ Alimentación de la pila alcalina (Disponible en las tiendas del ramo) ■AC power ■ Alimentación de CA 2 Power source / Alimentación ● Headphones x 1 ● Auriculares x 1 • AC 120V, 60Hz • 120V CA, 60H
PAGE 9
3 Insert a recordable MiniDisc. Inserte un minidisco grabable. 4 Connect the external equipment. Conecte el equipo externo. 6 5 Inicie la reproducción en el equipo fuente. Begin playback on the source equipment. Pulse el botón ENTER/SYNC. Press the ENTER/SYNC button. Mientras se produce el sonido del equipo externo conectado a este aparato, pulse el botón o para ajustar el nivel de grabación.
PAGE 10
MD-MT15/15C/15H/15W/161E/18H DISASSEMBLY STEP REMOVAL PROCEDURE FIGURE 1 Bottom Cabinet 1. Screw ..................... (A1) x7 10-1 2 Top Cabinet 1. Open the Top cabinet. 2. Screw ..................... (B1) x4 3. Screw ..................... (B2) x1 10-1 10-2 3 Key Switch/LCD 1. Flexible PWB ......... (C1) x2 4 Mechanism Unit 1. Flexible PWB ......... (D1) x2 10-2 2. Raise the rear part, and ..... 10-3 remove in the arrow direction. 5 Main PWB 1. Flat cable ................ (E1) x1 2.
PAGE 11
MD-MT15/15C/15H/15W/161E/18H NOTES ON SCHEMATIC DIAGRAM • Resistor: To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type. • Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means micro-micro-farad and the unit of the capacitor without such a symbol is microfarad.
PAGE 12
MD-MT15/15C/15H/15W/161E/18H VOLTAGE IC101 PIN 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 VOLTAGE 0.72V 0.72V 0.72V 0.72V 1.24V 1.24V 0.71V 1.24V 1.24V 1.24V 1.24V 1.24V 2.5V 2.5V 0.18V 2.5V 2.5V 0V 0V 1.48V 2.35V 0V 0V 2.5V 1.24V 1.24V 1.24V 1.24V 1.24V 1V 1.24V 1.24V 1.24V NC 1.25V 1.25V 0.17V 1.24V 1.24V 1.24V 1.24V 2.5V 0V 0V 1.24V 1.24V 1.24V 0V PIN NO.
PAGE 13
M M903 HEAD UP/DOWN MOTOR F T 17 1-2 40 16 PLAYBACK SIGNAL RECORD SIGNAL – 13 – 13 24,26 29,31 Figure 13 BLOCK DIAGRAM 6,8 5,9,10,14 23,27,28,32 VM 36 VG IC601 4CH PWM DRIVER MPC17A39 35 VCC +2.5V 13,14 24,42 2,15-17, 19-22 SW402 HOLD M M901 SPINDLE MOTOR 8 1-3 3 M 6-9 9, 11, 13, 42 IC901 SPINDLE MOTOR DRIVER BA6966FV 1, 3, 4, 5, 6,19,20 M902 SLED MOTOR 74 4 SW401 EJECT SW403 DISC LID OPEN KEY OPERATION UNIT LCD UNIT 52, 69, 70, 83, 84 97 98 3 2.
PAGE 14
MD-MT15/15C/15H/15W/161E/18H P14 P15 P16 SYD4 SYD5 SYD6 SYD7 SYWR AUDATA C124 390P AUSCLK RFLAT +B PDCNT INNSW EFMO LDCNT1 LDCNT2 LDCNT1 C201 1 SPDRR SPDRF SLDRR SLDRF TRDRR TRDRF FODRR FODRF TP207 TP413 DSPSTB DSPDAT DSPDAT SCKO DSPSTB P32 _EPCS DSPSCK VSS EEPK EEPD PLVON SYRS PCNT1 _SYRD TP412 AUSCLK AUDATA ELON EXTAL XTAL XL401 4.19MHz 11 RO2 12 PGND L608 4.7µH SLDRR SLDRF SPDRF L603 4.7µH RO3 29 VD3 28 L602 4.
PAGE 15
MD-MT15/15C/15H/15W/161E/18H P14 P15 P16 DADATA TP451 TP452 TP453 TP454 TP455 TP456 TP457 TP458 TP459 TP460 TP461 TP462 TP463 ADDATA TP202 HSTOP DAPON TP212 TP205 R455 5.6K HPLAY HKEY2 HKEY1 EFMO LDCNT1 OPTCNT LDCNT2 XL201 33.868MHz ADPON L206 100mA C212 5P(CH) L205 100mA L202 100mA TP204 R222 1M CK207 HREC DIN DADATA ADDATA R451 5.6K EMPH1 R456 8.
PAGE 16
MD-MT15/15C/15H/15W/161E/18H • NOTES ON SCHEMATIC DIAGRAM can be found on page 11. P14 P15 P16 • The numbers 1 to 18 are waveform numbers shown in page 22. TP451 TP452 TP453 TP454 TP455 TP456 TP457 TP458 TP459 TP460 TP461 TP462 TP463 EC A TOP R455 5.6K AY Y2 Y1 R451 5.6K R456 8.2K R457 18K R458 56K R453 18K R452 8.
PAGE 17
MD-MT15/15C/15H/15W/161E/18H MAGNETIC HEAD FLEXIBLE PWB(18) A M901 SPINDLE MOTOR OPTICAL PICKUP UNIT(13) MAGNETIC HEAD(24) B SW902 DISC PROTECT MECHANISM FLEXIBLE PWB C PH901 PHOTO INTERRUPTER D CN601 TO MAIN PWB P18 5-H M902 SLED MOTOR CN101 TO MAIN PWB P18 4-H M903 HEAD UP/DOWN MOTOR TO MAIN PWB P18 2-C CN451 TO MAIN PWB P18 3-C CN482 E F G KEY SWITCH FLEXIBLE PWB Ass'y (213) LCD Ass'y (214) H 1 2 3 4 Figure 17 WIRING OF P.W.
PAGE 18
MD-MT15/15C/15H/15W/161E/18H A R804 TP803 MAIN PWB-A1 (BOTTOM VIEW) C255 C254 R269 Terminal, Battery (235) CN702 1 C256 TO AUDIO PWB 8 IC805 4 5 33 1 R271 C258 R255 R254 R262 Q255 TP804 FLAT CABLE (243) R275 R267 33 1 R266 B R274 P20 3-A C253 13 1 Terminal, Battery (233) 1 9 Q253 Terminal, Battery (237) / R278 To LCD Ass'y P17 5-E R259 To Key Switch Flexible Ass'y P17 2-E R260 R261 R252 R276 9 TP666 TP660 TP657 TP656 Q254 TP655 8 TP119 TP120 TP121 18 22
PAGE 19
MD-MT15/15C/15H/15W/161E/18H R257 R258 Q252 R270 MAIN PWB-A1 (TOP VIEW) R256 SW801 SW801 Ni-MH BATTERY DETECTION R250 1 6 2 5 4 3 IC806 R251 D812 G 3 F871 T0.
PAGE 20
MD-MT15/15C/15H/15W/161E/18H TO MAIN PWB AUDIO PWB-A2 (TOP VIEW) CN701 P18 2-B 33 1 33 1 FLAT CABLE (243) A CN702 L751 L752 30 33 20 25 15 10 1 5 R766 R767 R768 C766 C765 B C752 L453 R763 R764 R765 R761 12 L771 C756 13 C758 C491 R716 C712 R756 R754 C757 D L703 R714 C759 L704 C760 C773 C774 15 D492 10 C714 IC703 D494 R762 C753 C771 20 C751 R753 5 R492 R770 C L454 C755 L456 24 1 C754 R769 3 R757 L719 4 5 C719 4 3 2 9 1 C762 C761 C507 C5
PAGE 21
MD-MT15/15C/15H/15W/161E/18H C776 AUDIO PWB-A2 (BOTTOM VIEW) TP066 TP062 TP728 TP077 TP068 TP076 TP064 TP061 TP065 L452 TP069 TP086 TP080 8 TP093 TP727 TP063 7 TP082 TP067 2 TP072 4 TP724 TP729 TP092 TP070 TP089 J703 HEADPHONES TP722 TP721 TP723 1 TP071 3 TP721B TP070B TP725 5 TP064B TP074 TP726 6 L451 TP085 TP704 TP705 C452 TP703 C713 TP073 TP079 TP075 TP090 R715 TP083 TP088 TP709 TP707 TP084 R713 TP708 TP087 TP702 TP701 13 12 R701 15 IC701 10 TP091
PAGE 22
MD-MT15/15C/15H/15W/161E/18H WAVEFORMS OF MD CIRCUIT T Stopped CH1=1mV DC 10:1 1 CH2=500mV DC 10:1 CH3=5V DC 10:1 TP208 (FEOUT) 5 SDTi 6 SCLK 3 CK205 (SENSE) 9 4 CK204 (FOK) LRCK 8 1994 / 12 / 16 01:03:40 2ms/div (2ms/div) ENV T TP209 (TOTAL) MCLK 4 4 =Filter= Smoothiing : OFF BW : FULL =Offset= CH1 : 0.00V CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V =Record Length= Main : 10K Zoom : 10K T Stopped CH1=2V DC 10:1 CH2=2V DC 10:1 =Trigger= Mode : NORMAL Type : EDGE CH4 Detay : 0.
PAGE 23
MD-MT15/15C/15H/15W/161E/18H PARTS GUIDE MODEL MD-MT15(S) MD-MT15C(S) MD-MT15H(RD) MD-MT15H(S) MD-MT15W(S) MD-MT161E(S) MD-MT18H(GR) “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For U.S.A. only Contact your nearest SHARP Parts Distributor to order.
PAGE 24
MD-MT15/15C/15H/15W/161E/18H NO.
PAGE 25
MD-MT15/15C/15H/15W/161E/18H NO.
PAGE 26
MD-MT15/15C/15H/15W/161E/18H NO.
PAGE 27
MD-MT15/15C/15H/15W/161E/18H NO.
PAGE 28
MD-MT15/15C/15H/15W/161E/18H 501x2 508x2 A 506 11 8 8-3(PH901) 24 B 8-1 505 16 512 14 C 502x3 8-2 (SW902) 18 509 503 2 13 507 9 507 1 M901 511 D 19 15 510 M903 7 21 503x2 504 E 12 6 M902 503 20 10 F 5 3 G 22 17 23 H 4 1 2 3 4 Figure 5 MD MECHANISM EXPLODED VIEW –5– 5 6
PAGE 29
MD-MT15/15C/15H/15W/161E/18H 229x2 238 237 230 A 202-1 245 202 231 202-2 603x2 227 201 B 226 201-1 247 228 239 243 225 236 PWB-A2 603x2 203 201-2 C 234 233 204 235 206 205 207 232 602x3 248 PWB-A1 MD-MT15H/15W/18H Only 214 D 602 602 244 601 215 216x2 242 218 E 213 217 208 209 F 240 241 224 223 601 219 211 219 222 210 603 MD-MT15H/15W/18H Only 212 G 603x2 MD MECHANISM 220 603x2 H 603x2 246 1 2 3 4 Figure 6 CABINET EXPLODED VIEW –6– 221 5 6
PAGE 30
MD-MT15/15C/15H/15W/161E/18H PACKING OF THE SET (MD-MT15 FOR U.S.A. ONLY) Setting position of switches and knobs UNIT HOLD OFF Operation Manual AC Adaptor Headphones Caution SPAKZ0485AWZZ AC Adaptor Pad Quick Guide Carying Case Connecting Cord TLABN0088AWZZ Serial No. Label SPAKZ0522AWZZ Protect Cushion Headphones SPAKA0220AWZZ Packing Add.
PAGE 31
MD-MT15/15C/15H/15W/161E/18H PACKING METHOD (MD-MT161E ONLY) Setting position of switches and knobs UNIT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. HOLD Connecting Cord, RCA Type Earphones Packing Add., Unit Packing Case Operation Manual Service Card Operation Manual Pad Carrying Case Serial No. Label Protect Cushion Protect Sheet Serial No.
PAGE 32
MD-MT15/15C/15H/15W/161E/18H COPYRIGHT © 1999 BY SHARP COPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any from or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.