Sharp MD-MT88H S Service Manual
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Sharp MD-MT88H S Service Manual

Portable minidisc recorder
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Illustration: MD-MT88H
Illustration: MD-MT99H
SAFETY PRECAUTION FOR SERVICE MANUAL ............................................................................................................... 2
SPECIFICATIONS ................................................................................................................................................................. 3
ACCESSORIES ..................................................................................................................................................................... 5
NAMES OF PARTS ............................................................................................................................................................... 6
OPERATION MANUAL .......................................................................................................................................................... 7
DISASSEMBLY .................................................................................................................................................................... 12
REMOVING AND REINSTALLING THE MAIN PARTS ....................................................................................................... 13
ADJUSTMENT ...................................................................................................................................................................... 14
MD ERROR MESSAGE DISPLAY CONTENT LIST ........................................................................................................... 27
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 28
TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 28
BLOCK DIAGRAM ............................................................................................................................................................... 29
SCHEMATIC DIAGRAM ...................................................................................................................................................... 30
WIRING SIDE OF P.W.BOARD ........................................................................................................................................... 32
VOLTAGE ............................................................................................................................................................................ 35
WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 36
TROUBLESHOOTING ......................................................................................................................................................... 37
FUNCTION TABLE OF IC .................................................................................................................................................... 40
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (FOR U.K. ONLY)
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
MODEL
CONTENTS
SHARP CORPORATION
MD-MT88H(S)
MD-MT99H(S)/(BL)
• 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.
MD-MT88H/99H
No. S6138MDMT88HS
Page

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  • Page 1: Table Of Contents

    TROUBLESHOOTING ................................. 37 FUNCTION TABLE OF IC ..............................40 PARTS GUIDE/EXPLODED VIEW PACKING METHOD (FOR U.K. 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-MT88H/99H SAFETY PRECAUTION FOR SERVICE MANUAL 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 EXCEEDING THE LIMIT FOR CLASS 1.

  • Page 3: Specifications

    MD-MT88H/99H FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS MD-MT88H Power source: DC 5 V: AC adaptor (AC 220-230 V, 50/60 Hz) For Europe For U.K. AC adaptor (AC 230-240 V, 50/60 Hz) DC 1.5 V: Commercially available, "AA"...
  • Page 4 MD-MT88H/99H MD-MT99H Power source: DC 1.2 V: Rechargeable Nickel-Metal Hydride battery (AD-N70BT) x 1 DC 5 V: AC adaptor (AC 220-230 V, 50/60 Hz) For Europe AC adaptor (AC 230-240 V, 50/60 Hz) For U.K. DC 1.5 V: Commercially available, "AA" size (LR6), alkaline battery x 1 DC 4.5 V: Optional car adaptor, AD-CA20X (for cars with a 12-24 V DC negative earth electrical system)

  • Page 5: Accessories

    MD-MT88H/99H ACCESSORIES MD-MT88H For U.K. For Europe Earphones x 1 AC Adaptor (RADPA8046AWZZ) x 1 (For U.K.) Connection Cable (for analogue re- AC Adaptor (RADPA7045AWZZ) x 1 (For Europe) cording) 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.

  • Page 6: Names Of Parts

    MD-MT88H/99H NAMES OF PARTS Main unit 1. 5V DC Input Socket 2. Optical/Line Input Socket 3. Microphone Input Socket 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 7: Operation Manual

    MD-MT88H/99H OPERATION MANUAL 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 AD-N70BT cannot be charged.(MD-MT88H) A rechargeble battery other than the one supplied...
  • Page 8 MD-MT88H/99H Error Messages ERROR MES- MEANING ERROR MES- MEANING SAGES SAGES The battery has run down. Can'tSTAMP Stamp function does not work. BATT EMPTY BLANK MD Nothing is recorded. (Check the number of tracks.) (Replace the disc with a recorded disc.) Can'tWRITE Cannot save the TOC information cor- rectly to a MiniDisc.
  • Page 9 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. The unit does not turn on.
  • Page 10 MD-MT88H/99H Inserting a MiniDisc Connect the AC adaptor AC 230-240V, 50/60 Hz (For U.K.) Illustration: MD-MT88H To the wall socket. Illustration: MD-MT88H Insert according to the direction arrow. To the DC IN 5V socket. AC 220-230V, Insert securely, all the way in. 50/60 Hz (For Europe) Slide the OPEN lever to re-...
  • Page 11 MD-MT88H/99H Recording Recording: continued Check that the unit is connected to the stereo system. Press the PAUSE button on the stereo system to enter the play- back pause mode. Here you can search for the track to record. Press the MODE/CHRG button repeatedly to select the record- ing mode.

  • Page 12: Disassembly

    MD-MT88H/99H 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 13: Removing And Reinstalling The Main Parts

    MD-MT88H/99H REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling meth- ods 1 to 4. (See Page 13.) (A2) x3 ø1.4 x2.5mm How to remove the spindle motor (See Fig. 13-1.) 1. Remove the solder joints (A1) x 4 of flexible PWB. Mechanism Flexible Spindle 2.

  • Page 14: Adjustment

    MD-MT88H/99H ADJUSTMENT Test disc MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc). Parts No. Type Test disc 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 15 MD-MT88H/99H • 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 16 MD-MT88H/99H 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 17 MD-MT88H/99H 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 18 MD-MT88H/99H EEPROM DATA LIST (EEPROM version c) ADJ. SET setting TEMP setting Item display Set values Item display Set values C O K _ T M _ _ Calculate values F A B _ F B O _ Focus setting H S G _ Item display Set values...
  • Page 19 MD-MT88H/99H Test Mode Change Chart Tset Mode Menu T E S T : Test Mode STOP FAST FORWARD FAST REVERSE Slide external Slide internal periphery move periphery move BASS FAST REVERSE A U T O 1 : Pre-auto adjustment menu FAST FORWARD FAST REVERSE A U T O 2...
  • Page 20 MD-MT88H/99H ATT Auto Adjustment A U T O 2 : ATT Autoadjustment menu PLAY A T 2 : During ATT autoadjustment Adjustment error A D J . N G Normal end : ATT adjustment error (adjustment value output) A D J . O K : ATT adjustment normal end (adjustment value output) MODE : Focus balance Adjustment mode...
  • Page 21 MD-MT88H/99H Continuous Rrecord • Continuous record from the current pickup position R E C : Continuous record menu PLAY : Continuous record A P # # # # # # # #: Address • Continuous record playback from any address R E C : Continuous record menu PLAY...
  • Page 22 MD-MT88H/99H Error History Display • Error history clear D A T A : Error history display menu DISP C L E A R : Error history clear • Error history display D A T A : Error history display menu PLAY E 0 §...
  • Page 23 MD-MT88H/99H Focus Setting F o c u s : Focus setting menu PLAY F G 1 FAST FORWARD FAST REVERSE F Z H FAST FORWARD FAST REVERSE F L n FAST FORWARD FAST REVERSE F L p FAST FORWARD FAST REVERSE F T S FAST FORWARD FAST REVERSE...
  • Page 24 MD-MT88H/99H Tracking Setting T r a c k : Tracking setting menu PLAY T G 1 FAST FORWARD FAST REVERSE FAST FORWARD FAST REVERSE C L r T B o FAST FORWARD FAST REVERSE FAST FORWARD FAST REVERSE J P I T B t FAST FORWARD FAST REVERSE...
  • Page 25 MD-MT88H/99H TEMP Setting T e m p : Temp setting menu PLAY : TEMP reference T M § § : Reference FAST FORWARD FAST REVERSE § § : Temperature code : TEMP A/D input value T p i n : Measurement value * When the [STOP ] button is pressed in specific menu, the "TEST MODE STOP"...
  • Page 26 MD-MT88H/99H Control Setting C T R L : Control setting menu PLAY C T 0 U S 2 FAST FORWARD FAST REVERSE FAST REVERSE FAST FORWARD C T 1 U S 1 FAST FORWARD FAST REVERSE FAST REVERSE FAST FORWARD C T 2 U S 0 FAST FORWARD...

  • Page 27: Md Error Message Display Content List

    MD-MT88H/99H MD ERROR MESSAGE DISPLAY CONTENT LIST Display content Remarks Error content Error code (Remote control) Can' t READ* Readout of the information is not (Can' tS) completed. f: Focus error r: READ ERR Can' t READ* Readout of the TOC information * indicates the detailed factor.

  • Page 28: Notes On Schematic Diagram

    MD-MT88H/99H 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 29: Block Diagram

    MD-MT88H/99H 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 29 BLOCK DIAGRAM – 29 –...

  • Page 30: Schematic Diagram

    MD-MT88H/99H MAIN PWB-A C109 C111 C112 C110 PLAYBACK SIGNAL 0.033 0.22 C107 C106 0.033 RECORD SIGNAL TP202 C108 TP139 48 47 46 45 44 43 42 41 40 39 38 37 CK203 C131 1234 CK202 XL201 33.8688MHz ADAGI CK201 C211 5P ADAGC DIFF C132...
  • Page 31 MD-MT88H/99H 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 32: Wiring Side Of P.w.board

    MD-MT88H/99H MAIN PWB-A (BOTTOM VIEW) 15 14 C211 C212 R222 F841 R850 0.4A DC60V C843 C841 R811 Q801 C850 C847 TP841 R807 C832 C846 TP651 C860 TP652 R871 TP803 D842 C834 TP463 TP802 TP805 IC852 IC822 TP801 C833 TP457 TP459 C802 TP655 TP664...
  • Page 33 MD-MT88H/99H BATTERY DC 1.2V (NICKEL-METAL HYDRIDE ) TERMINAL DC 1.5V LR6(SIZE AA) BATTERY TERMINAL MAIN PWB-A (TOP VIEW) R257 R283 R819 R462 Q461 R814 R802 D803 R253 R812 C818 R460 IC253 IC809 R254 R813 C253 Q257 R816 IC257 R284 D802 R287 IC802 C252...
  • Page 34 MD-MT88H/99H M902 OPTICAL PICKUP UNIT(17) SLED MOTOR TO MAIN PWB P33 10,11-C CN601 MAGNETIC HEAD Ass'y(16) M901 SPINDLE MOTOR MECHANISM FLEXIBLE PWB Ass'y (15) CN101 PH901 P33 8,9-F PHOTO TO MAIN PWB INTERRUPTER (15-2) M903 LIFT MOTOR TO MAIN PWB P33 9,10-C CN451 TO MAIN PWB...

  • Page 35: Voltage

    MD-MT88H/99H VOLTAGE IC101 IC201 IC401 IC601 IC703 IC851 VOLTAGE PIN VOLTAGE PIN VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE 1.26V 2.34V 0.2V 1.29V 2.1V 2.5V 0.28V IC852 2.53V 1.27V 1.27V 2.5V 7.85V 2.53V VOLTAGE 1.27V 2.5V 2.67V -2.3V 1.18V 1.27V 1.6V 2.5V 2.81V 1.27V...

  • Page 36: Waveforms Of Md Circuit

    MD-MT88H/99H 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 37: Troubleshooting

    MD-MT88H/99H TROUBLESHOOTING It is advisable to use the TEST mode (refer to Error Data Display Mode, P16) indicating the causes of troubles before starting repair. Causes of operation errors (up to 10 errors) are recorded as error codes. This information is useful for repair.
  • Page 38 MD-MT88H/99H • 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 39 MD-MT88H/99H • 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 40: Function Table Of Ic

    MD-MT88H/99H FUNCTION TABLE OF IC IC401 RH-iX0431AWZZ :System Microcomputer (IX0431AW) (1/2) Port Name Terminal Name Input/Output Function Pin No. P12/TCLKA Input Track cross signal/focus drive detection TCLKB SPIN Input Spindle motor FG pulse detection input RFPCNT Input RF control DISCPR Input Disc record inhibition switch input TIOCA2...
  • Page 41 MD-MT88H/99H IC401 RH-iX0431AWZZ :System Microcomputer (IX0431AW) (2/2) Pin No. Port Name Terminal Name Input/Output Function 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 42 MD-MT88H/99H IC201 VHiLR378161-1 :Endec/Servo/Atrac (LR378161) System LSI expansion output port (LR378161) 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 43 MD-MT88H/99H IC601 VHiLV8018W+-1 :PWM Driver (LV8018W) 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 44 MD-MT88H/99H IC601 VHiLV8018W+-1 :PWM Driver (LV8018W) 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 45 “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 46 MD-MT88H/99H PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK INTEGRATED CIRCUITS AC 10 µH L171 RCILC0356AFZZ L452 RCILC0352AFZZ AB Tip Impeder,150mA IC101 VHIIR3R58M/-1 AM RF Signal Processor,IR3R58M L453,454 RCILC0353AFZZ AB Tip Solid Induction,100mA IC201 VHILR378161-1 BQ Endec/Servo/Atrac,LR378161 L456 RCILC0353AFZZ AB Tip Solid Induction,100mA AC 22 µH,Choke...
  • Page 47 MD-MT88H/99H PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK AB 0.22 µF,16V C731 VCKYCY1CF224Z R261 VRS-CY1JB102J AA 1 kohm,1/16W AB 0.1 µF,16V C733,734 VCKYCY1CB104K R262 VRS-CY1JB124F AA 120 kohms,1/16W AC 1 µF,6.3V C753,754 VCKYCY0JB105K R266 VRS-CY1JB473F AA 47 kohms,1/16W AD 1 µF,16V C758 VCKYTQ1CB105K...
  • Page 48 MD-MT88H/99H PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK CABINET PARTS R811 VRS-TV2AB1R0J AA 1 ohm,1/10W R812~815 VRS-CY1JB103F AA 10 kohm,1/16W R816 VRS-CY1JB152J AA 1.5 kohms,1/16W GCABA1234AWSB J AL Center Cabinet [88H/99H (S)] R818 VRS-CY1JB564J AA 560 kohms,1/16W GCABA1234AWSC J AL Center Cabinet [99H (BL)] R819...
  • Page 49 MD-MT88H/99H PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK RRMCW0002AWSA J AY Remote Contorol [99H (S/BL)Only] UBAGC0003AWZZ J AD Battery Carrying Case [99H (S/BL)Only] ———— — Battery (Not Replacement Item) [99H (S/BL)Only] TGANE0013AWZZ J Warranty/Registration Card P.W.B. ASSEMBLY (Not Replacement Item) PWB-A 92LPWB3742MDS —...
  • Page 50 MD-MT88H/99H 15-2 (PH901) M901 15-1 M902 M903 Figure 5 MD MECHANISM EXPLODED VIEW – 5 –...
  • Page 51 MD-MT88H/99H MECHANISM MD-MT99H 603x2 MD-MT88H 214-2 212-2 214-1 212-1 212-3 603x2 MD-MT88H PWB-A MD-MT88H ONLY 603x2 603x2 Figure 6 CABINET EXPLODED VIEW – 6 –...
  • Page 52 SSAKH0033AWZZ Bag, Polyethylene TGANE0013AWZZ Warranty/Registration card (99H Only) © COPYRIGHT 2001 BY SHARP CORPORATION SHARP CORPORATION ALL RIGHTS RESERVED. AV Systems Group Audio Systems Division No part of this publication may be reproduced, Higashihiroshima, Hiroshima 739-0192, Japan stored in a retrieval system, or transmitted in...

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