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Sharp MD-MT80W(S) Service Manual

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Illustration: MD-MT80W
Illustration: MD-MT90W/90/90C
SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT80W/90W ONLY) ..................................................................... 2
AC ADAPTOR AND PLUG (MD-MT80W/90W ONLY) .......................................................................................................... 3
SPECIFICATIONS ................................................................................................................................................................. 4
ACCESSORIES ..................................................................................................................................................................... 6
NAMES OF PARTS ............................................................................................................................................................... 7
OPERATION MANUAL .......................................................................................................................................................... 8
QUICK GUIDE (MD-MT90 ONLY) ....................................................................................................................................... 12
DISASSEMBLY .................................................................................................................................................................... 14
REMOVING AND REINSTALLING THE MAIN PARTS ....................................................................................................... 15
ADJUSTMENT ...................................................................................................................................................................... 16
MD ERROR MESSAGE DISPLAY CONTENT LIST ........................................................................................................... 29
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 30
TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 30
BLOCK DIAGRAM ............................................................................................................................................................... 31
SCHEMATIC DIAGRAM ...................................................................................................................................................... 32
WIRING SIDE OF P.W.BOARD ........................................................................................................................................... 34
WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 37
VOLTAGE ............................................................................................................................................................................ 38
TROUBLESHOOTING ......................................................................................................................................................... 39
FUNCTION TABLE OF IC .................................................................................................................................................... 42
PARTS GUIDE/EXPLODED VIEW
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
MODEL
CONTENTS
SHARP CORPORATION
MD-MT80W/90W/90/90C
MD-MT80W(S)
MD-MT90W(S)
MD-MT90(S)
MD-MT90C(S)
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
No. S4123MDMT80W/
Page

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  Summary of Contents for Sharp MD-MT80W(S)

  • Page 1: Table Of Contents

    TROUBLESHOOTING ................................. 39 FUNCTION TABLE OF IC ..............................42 PARTS GUIDE/EXPLODED VIEW PACKING OF THE SET (FOR U.S.A. ONLY) This document has been published to be used SHARP CORPORATION for after sales service only. The contents are subject to change without notice.
  • Page 2: Safety Precaution For Service Manual (Md-Mt80W/90W Only)

    MD-MT80W/90W/90/90C SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT80W/90W ONLY) Precaution to be taken when replacing and servicing the Laser Diode Properties Laser Pickup. Material: GaAlAs Wavelength: 785 nm THE AEL (ACCESSIBLE EMISSION LEVEL) OF THE LASER Pulse time: POWER OUTPUT IS LESS THAN CLASS 1 BUT THE LASER Read mode: 0.8 mW Continuous COMPONENT IS CAPABLE OF EMITTING RADIATION Write mode:...
  • Page 3: Ac Adaptor And Plug (Md-Mt80W/90W Only)

    MD-MT80W/90W/90/90C AC ADAPTOR AND PLUG (MD-MT80W/90W ONLY) PADPA6049AWZZ PADPA5052AWZZ PADPA5051AWZZ PADPA5050AWZZ QPLGA0004AWZZ – 3 –...
  • Page 4: Specifications

    MD-MT80W/90W/90/90C FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS MD-MT80W/90W General Battery life: Power source: When using the optional When using a commercial- rechargeable battery (fully ly available, high capacity, DC 5V: AC adaptor (AC 110-240V, 50/60 Hz) charged) "AA"...
  • Page 5 MD-MT80W/90W/90/90C MD-MT90/90C General Battery life: Power source: When using the recharge- When using a commercial- able battery (fully charged) ly available, high capacity, DC 1.2V: Rechargeable Nickel-Metal Hydride included with the unit "AA" size (LR6), alkaline battery (AD-N70BT) x 1 battery DC 5V: AC adaptor (AC 120V, 60 Hz)
  • Page 6: Accessories

    MD-MT80W/90W/90/90C ACCESSORIES MD-MT80W AC Adaptor x 1 Connection Cable (for analogue recording) x 1 Headphones x 1 Notes: Parts and equipment mentioned in this operation manual other than those detailed above are not included. The AC adaptor may be different from the one in the drawing. MD-MT90W MD-MT90W AC Adaptor x 1...
  • Page 7: Names Of Parts

    MD-MT80W/90W/90/90C NAMES OF PARTS Main unit 1. 5V DC Input Jack 2. Optical/Line Input Jack 3. Microphone Input Jack 4. Bass/Delete Button 5. Edit/Auto Mark/Time Mark Button 6. Display/Character Select Button 7. Mode/Charge Button 8. Record/Track Mark Button 9. Volume/Cursor/Fast Forward/Fast Reverse/ Recording Level/Name Select Button 10.
  • Page 8: Operation Manual

    MD-MT80W/90W/90/90C NAMES OF PARTS Display panel 1. Level Meter 2. Record Indicator 3. Remaining Recording Time Indicator 4. Monaural Long-Play Mode Indicator 5. Repeat Indicator 6. TOC Indicator 7. Synchro Recording Indicator 8. Disc Mode Indicator 9. Disc Name Indicator 10.
  • Page 9: Battery Power

    MD-MT80W/90W/90/90C MD-MT90/90C Battery Power Charging the rechargeable battery When the rechargeable battery is used for the first time or when you want to use it after a long period of disuse, be sure to charge it fully. Insert the rechargeable battery. A rechargeable battery other than the one supplied or the optional one (AD-N70BT) cannot be charged.
  • Page 10: Error Messages

    MD-MT80W/90W/90/90C Error Messages ERROR MESSAGES MEANING REMEDY The battery is run down. Charge the rechargeable battery or replace the al- BATT EMPTY kaline battery (or use the AC adaptor for power). Nothing is recorded. Replace the disc with a recorded disc. BLANK MD Can't COPY You tried to record from a copy prohibited...
  • Page 11: Minidisc System Limitations

    MiniDisc. Troubleshooting Many potential "problems" can be resolved by the owner without calling a service technician. If something seems to be wrong with this product, check the following before calling your authorised SHARP dealer or service centre. PROBLEM CAUSE The unit does not turn on.
  • Page 12: Quick Guide (Md-Mt90 Only)

    MD-MT80W/90W/90/90C MD-MT90 ONLY Inserting a MiniDisc Quick Guide / Guía rápida Inserción de un minidisco PORTABLE MINIDISC RECORDER GRABADOR/REPRODUCTOR MINIDISC PORTÁTIL MODEL /MODELO MD-MT90 Insert according to the direction of the arrow. Quick Setup Guide Insértelo de acuerdo con la dirección de la flecha. Guía rápida de configuración Slide the OPEN lever to re- Insert a MiniDisc as shown.
  • Page 13: Preparation For Use

    MD-MT80W/90W/90/90C Preparation for use Recording / Grabación Preparación para su utilización Check that the unit is connected to the stereo system. Compruebe que el aparato esté conectado al sistema estéreo. The unit does not work if the unit is in the hold mode. El aparato no funciona si está...
  • Page 14: Disassembly

    MD-MT80W/90W/90/90C DISASSEMBLY Cares before disassembling (A1) x1 When assembling the machine after disassembling or (A1) x2 ø1.4 x2mm repair, observe the following requirements so as to ensure ø1.4 x2mm (B1) x2 safety and performance. ø1.4 x2mm 1. Remove the batteries from the machine, and take out the Battery Lid mini-disc.
  • Page 15: Removing And Reinstalling The Main Parts

    MD-MT80W/90W/90/90C REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling meth- ods 1 to 4. (See Page 14.) (A2) x3 ø1.4 x2.5mm How to remove the spindle motor (See Fig. 15-1.) 1. Remove the solder joints (A1) x 4 of flexible PWB. Mechanism Flexible Spindle 2.
  • Page 16: Adjustment

    MD-MT80W/90W/90/90C ADJUSTMENT Test disc MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc). Type Test disc Parts No. High reflection disc MMD-110 (TEAC Test MD) 88GMMD-110 Low reflection disc MMD-212 (TEAC Test MD) 74-minute disc 88GMMD-212 Low reflection disc MMD-213A (TEAC Test MD) 80-minute disc...
  • Page 17 MD-MT80W/90W/90/90C • Whenever the DISP button is pressed in the continuous Operation in each TEST mode playback mode, the indication changes as follows. 1. AUTO1 Mode * Pre-mastered disc • When the STOP button is pressed while the AUTO1 menu Continuous playback (SUBQ address indication) [ S Q appears or during automatic adjustment, the mode changes to the TEST mode stop state.
  • Page 18 MD-MT80W/90W/90/90C 5. NORMAL Mode • When the STOP button is pressed while the NORMAL menu appears, the mode changes to the TEST mode stop state. • Indication during operation Indication of memory capacity on main unit LCD ] + Level meter : Internal mode : Address (Cluster section) : Address (Sector section)
  • Page 19 MD-MT80W/90W/90/90C 2. Temperature reference setting method EEPROM (IC402) writing procedure [1] Measurement, calculation and setting procedure 1. Procedure to replace EEPROM and write initial (1) Set the TEST mode. value of microcomputer in EEPROM • Set TEST 1, 0 = '01', and turn on power (1) Replace EEPROM.
  • Page 20 MD-MT80W/90W/90/90C EEPROM DATA LIST (EEPROM version d) Spindle setting ADJ. SET setting TEMP setting Item display Set values Item display Set values Item display Set values T M _ _ Calculate values S P G _ C O K _ S P i _ F A T _ S P m _...
  • Page 21 MD-MT80W/90W/90/90C – 21 –...
  • Page 22 MD-MT80W/90W/90/90C – 22 –...
  • Page 23 MD-MT80W/90W/90/90C – 23 –...
  • Page 24 MD-MT80W/90W/90/90C – 24 –...
  • Page 25 MD-MT80W/90W/90/90C – 25 –...
  • Page 26 MD-MT80W/90W/90/90C – 26 –...
  • Page 27 MD-MT80W/90W/90/90C – 27 –...
  • Page 28 MD-MT80W/90W/90/90C Control Setting C T R L : Control setting menu PLAY C T 0 FAST FORWARD FAST REVERSE C T 1 FAST FORWARD FAST REVERSE C T 2 FAST FORWARD FAST REVERSE C T 3 FAST FORWARD FAST REVERSE FAST FORWARD FAST REVERSE FAST FORWARD...
  • Page 29: Md Error Message Display Content List

    MD-MT80W/90W/90/90C MD ERROR MESSAGE DISPLAY CONTENT LIST Display content Remarks Error content Error code (Remote control) Can' t READ* Readout of the information is not f: Focus error (Can' tS) completed. r: READ ERR Can' t READ* Readout of the TOC information s: Search time over * indicates the detailed factor.
  • Page 30: Notes On Schematic Diagram

    MD-MT80W/90W/90/90C NOTES ON SCHEMATIC DIAGRAM • Resistor: • The indicated voltage in each section is the one measured To differentiate the units of resistors, such symbol as K and by Digital Multimeter between such a section and the chas- M are used: the symbol K means 1000 ohm and the symbol sis with no signal given.
  • Page 31: Block Diagram

    MD-MT80W/90W/90/90C J702 J801 MIC IN J703 J703 Ni - MH Battery DC IN J701 J701 (READY FOR HEADPHONES REMOTE PLUG/IN POWER) (5V) OPTICAL IN LINE IN LINE CONTROL Dry Battery (1 pieces) 1.0-1.7V +1-2V Figure 31 BLOCK DIAGRAM – 31 –...
  • Page 32: Schematic Diagram

    MD-MT80W/90W/90/90C MAIN PWB-A C221,L204 : MT90/90C Only R207 680 ohms, RESISTOR : MT90/90C 0 ohms, JUMPER : MT80W/90W C109 C111 C112 C110 PLAYBACK SIGNAL 0.22 C107 C106 RECORD SIGNAL TP202 C108 TP139 48 47 46 45 44 43 42 41 40 39 38 37 CK203 C131 1234...
  • Page 33 MD-MT80W/90W/90/90C TP451 BASS TP452 DISP LCD UNIT R455 R456 TP453 EDIT R457 R458 5.6K 8.2K HKEY2 TP454 MODE/CHRG ASS'Y(222) HREC TP455 R451 TP456 ENTER/SYNC 5.6K HKEY1 TP457 :OFF/HOLD DADATA R452 R453 TP458 PLAY/PUSE R454 ADDATA 8.2K TP459 DFCK TP460 VOL + TP461 VOL –...
  • Page 34: Wiring Side Of P.w.board

    MD-MT80W/90W/90/90C 15 14 C211 C212 R222 F841 R850 IC842 0.4A DC60V C844 C843 C841 R811 Q801 C850 C847 TP841 R807 C832 C846 TP651 C860 TP652 R871 TP803 D842 C834 TP802 TP463 TP805 IC852 IC822 TP801 C833 TP457 TP459 C802 TP655 TP664 IC871 TP451...
  • Page 35 MD-MT80W/90W/90/90C BATTERY DC 1.2V (NICKEL-METAL HYDRIDE ) TERMINAL DC 1.5V LR6(SIZE AA) BATTERY TERMINAL R257 R283 R819 R462 Q461 R814 R802 D803 R253 R812 R460 C818 IC253 IC809 R254 R813 R284 C253 Q257 R816 IC257 D802 R287 IC802 C252 R255 C291 CN601 CN451...
  • Page 36 MD-MT80W/90W/90/90C OPTICAL PICKUP UNIT(17) M902 SLED MOTOR TO MAIN PWB P35 10,11-C CN601 MAGNETIC HEAD Ass'y(16) M901 SPINDLE MOTOR MECHANISM FLEXIBLE PWB Ass'y (15) CN101 PH901 P35 8,9-F PHOTO TO MAIN PWB INTERRUPTER (15-2) M903 LIFT MOTOR TO MAIN PWB P35 9,10-C CN451 TO MAIN PWB...
  • Page 37: Waveforms Of Md Circuit

    MD-MT80W/90W/90/90C WAVEFORMS OF MD CIRCUIT Stopped Stopped 1994 / 12 / 15 22:54:19 1994 / 12 / 16 00:24:17 Stopped 1994 / 12 / 16 01:03:40 CH1=1mV CH2=500mV CH3=5V CH4=2V 50ms/div CH1=2V CH2=2V CH3=2V CH4=2V 50us/div CH1=1V CH2=2V CH3=500mV 2ms/div DC 10:1 DC 10:1 DC 10:1...
  • Page 38: Voltage

    MD-MT80W/90W/90/90C VOLTAGE IC101 IC201 IC401 IC601 IC703 IC842 VOLTAGE PIN VOLTAGE PIN VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE 1.26V 0.85V 2.34V 2.81V 1.29V 2.34V 2.5V 2.53V 1.27V 0.25V 2.36V 1.27V 2.36V 7.85V 2.53V IC851 1.27V 2.36V 2.67V -2.3V 1.27V 0.25V 1.6V 2.36V VOLTAGE...
  • Page 39: Troubleshooting

    MD-MT80W/90W/90/90C TROUBLESHOOTING It is advisable to use the TEST mode (refer to Error Data Display Mode, P18) indicating the causes of troubles before starting repair. Causes of operation errors (up to 16 errors) are recorded as error codes. This information is useful for repair.
  • Page 40 MD-MT80W/90W/90/90C • Abnormal display Is waveform output from CN482 pins 6 to 8? Is waveform output from IC401 pins 9,11,13? Are the pin 4 (VCC) and pin 5 (GND) normal? Check between IC401 and Check the periphery of IC401. CN482. Check for pattern breakage of flexible PWB, check for defects of display microcomputer (replace the display unit).
  • Page 41 MD-MT80W/90W/90/90C • The spindle motor fails to run. Does the head move Check the IC201 periphery. Does the waveform appear on the IC201 pins 24 and 25 after TEST mode AUTO2 completion and in this state? Replace. IC601 Does waveform appear on the IC601 pin 43? Does waveform appear on IC901 pins 1, 2 and 23? L608, IC201, IC901, CN601 and flex, etc.
  • Page 42: Function Table Of Ic

    MD-MT80W/90W/90/90C FUNCTION TABLE OF IC IC401 RH-iX0409AWZZ :System Microcomputer (IX0409AW) (1/2) Terminal Name Input/Output Function Pin No. Port Name P12/TCLKA Input Track cross signal/focus drive detection TCLKB SPIN Input Spindle motor FG pulse detection input REPCNT Input RF control DISCPR Input Disc record inhibition switch input TIOCA2...
  • Page 43 MD-MT80W/90W/90/90C IC401 RH-iX0409AWZZ :System Microcomputer (IX0409AW) (2/2) Port Name Terminal Name Input/Output Function Pin No. Input Operation mode selection input 1 DCEXT Input DC-IN detection (level) WDTOVF WDTOVF Output Watch dog timer (not used) Input Operation mode selection input 2 _RESET Input Microcomputer hard reset input...
  • Page 44 MD-MT80W/90W/90/90C IC201 VHiLR37815+-1 :Endec/Servo/Atrac (LR37815) System LSI expansion output port (LR37815) Pin No. Port Name Terminal Name Input/Output Function Remarks EXPORT0 LEDON1 Output LED ON/OFF 'H':ON"L":OFF EXPORT1 LDCNT1 Output Recording head raising-lowering control output 1 See the separate table *3. EXPORT2 LDCNT2 Output...
  • Page 45 MD-MT80W/90W/90/90C IC601 VHiLV8018W+-1 :PWM Driver (LV8018W) (1/2) Pin No. Terminal Name Function MUTE MUTE terminal at CH3. MUTE ON with "L". IN3+ Input terminals on forward/reverse sides of CH3(digital input). — — — Applies the supply voltage of the pre-drive unit. When VGOFF="L", the voltage on the booster circuit is output to this terminal and it becomes the direct supply voltage of the pre-drive unit.
  • Page 46 MD-MT80W/90W/90/90C IC601 VHiLV8018W+-1 :PWM Driver (LV8018W) (2/2) 46 45 44 43 42 41 40 39 38 37 MUTE IN4R IN3+ VGOFF LV8018W VCC1 VCC2 IN3– VBATT VBATT/2MON MUTE1 IN2R 13 14 15 16 17 18 19 20 21 22 23 24 IC202 RH-iX2735AFZZ: 16M Bit D-RAM (IX2735AF) Function Terminal Name...
  • Page 47 “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the For U.S.A. only following information. Contact your nearest SHARP Parts Distributor to order. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For location of SHARP Parts Distributor, Please call Toll-Free;...
  • Page 48 MD-MT80W/90W/90/90C PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK INTEGRATED CIRCUITS COILS AC 10 µH IC101 VHIIR3R58M/-1 AM RF Signal Processor,IR3R58M L100 VPBNN100K0000 AC 10 µH IC201 VHILR37815+-1 BF Endec/Servo/Atrac,LR37815 L171 RCILC0356AFZZ IC202 RH-IX2735AFZZ AX 16MBit D-RAM,IX2735AF L204 RCILC0353AFZZ AB Tip Solid Induction,100 mA IC203...
  • Page 49 MD-MT80W/90W/90/90C PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK AB 1 µF,16V C651 VCKYTV1CF105Z R138 VRS-CY1JB394F AA 390 kohms,1/16W AB 0.1 µF,16V C652 VCKYCY1CB104K R139 VRS-CY1JB393J AA 39 kohms,1/16W AD 10 µF,6.3V,Electrolytic,Tantalum C701,702 VCSATA0JJ106M R140 VRS-CY1JB394J AA 390 kohms,1/16W AA 0.01 µF,25V C703 VCKYCY1EB103K...
  • Page 50 MD-MT80W/90W/90/90C PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK R727 VRS-CY1JB822J AA 8.2 kohms,1/16W QPWBH0013AWM1 J Mechanism Flexible PWB Ass’y R728 VRS-CY1JB102J AA 1 kohm,1/16W 15- 1 ———— — Mechanism Flexible PWB R729,730 VRS-CY1JB472J AA 4.7 kohms,1/16W (Supplies at Ref No.15) R754 VRS-CY1JB154J AA 150 kohms,1/16W...
  • Page 51 MD-MT80W/90W/90/90C PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK OTHER SERVICE PARTS SPAKZ0490AWZZ AC Pad,Operation Manual SPAKZ0624AWZZ Pad,Protection SPAKZ0630AWZZ Pad,AC Adaptor [90/90C] UDSKM0001AFZZ AZ Recording Mini Disc SPAKZ0753AWZZ Pad,AC Adaptor [80W/90W] 88GMMD-110 BV High Reflection Disc MMD-110 SSAKH0033AWZZ J AB Bag,Polyethylene (TEAC Test MD) TLABE0514AWZZ...
  • Page 52 MD-MT80W/90W/90/90C 502x2 505x3 15-2 (PH901) 503x2 M901 15-1 M902 M903 Figure 5 MD MECHANISM EXPLODED VIEW – 5 –...
  • Page 53 MD-MT80W/90W/90/90C MECHANISM MD-MT90W/90/90C 603x2 MD-MT80W 214-2 212-2 214-1 212-1 212-3 603x2 MD-MT80W PWB-A 603x2 603x2 Figure 6 CABINET EXPLODED VIEW – 6 –...
  • Page 54: Packing Of The Set (For U.s.a. Only)

    MD-MT80W/90W/90/90C PACKING OF THE SET (FOR U.S.A. ONLY) Setting position of switches and knobs Remote Control HOLD CANCEL Pad,Accessories SPAKZ0490AWZZ Quick Guide Caution,Headphone Remote Control Operation Manual Rechargeable Battery Label,SER.No. Battery Case TLABN0092AWZZ Connection Cable (for analog recording) AC Adaptor Pad,Protection SPAKZ0624AWZZ Bag,Polyethylene...
  • Page 55 MD-MT80W/90W/90/90C –MEMO– – 8 –...
  • Page 56 MD-MT80W/90W/90/90C © COPYRIGHT 2001 BY SHARP COPORATION 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.

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