Sharp MD-MT866H Service Manual

Portable minidisc recorder
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SAFETY PRECAUTION FOR SERVICE MANUAL ............................................................................................................... 2
SPECIFICATIONS ................................................................................................................................................................. 3
NAMES OF PARTS ............................................................................................................................................................... 4
OPERATION MANUAL .......................................................................................................................................................... 6
DISASSEMBLY .................................................................................................................................................................... 12
REMOVING AND REINSTALLING THE MAIN PARTS ....................................................................................................... 13
ADJUSTMENT ...................................................................................................................................................................... 14
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 ............................................................................................................................................................................ 36
WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 37
TROUBLESHOOTING ......................................................................................................................................................... 38
FUNCTION TABLE OF IC .................................................................................................................................................... 41
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (MD-MT866H(S) FOR U.K. ONLY)
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
MODEL
CONTENTS
SHARP CORPORATION
MD-MT866H/MD-MT866W
MD-MT866H(S)
MD-MT866W(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. S0079MDMT866H
Page

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Summary of Contents for Sharp MD-MT866H

  • Page 1: Table Of Contents

    WAVEFORMS OF MD CIRCUIT ............................37 TROUBLESHOOTING ................................. 38 FUNCTION TABLE OF IC ..............................41 PARTS GUIDE/EXPLODED VIEW PACKING METHOD (MD-MT866H(S) 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

    Lens at any time. (5) CAUTION - Use of controls or adjustments, or performance of procedures other than those specified herein may result in hazardous radiation exposure. MD-MT866W(S) MD-MT866H(S) Except for U.K. LASER KLASSE 1 LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARA MD-MT866W(S) MD-MT866H(S) Except for U.K.
  • Page 3: Specifications

    Power source DC 1.2V: Rechargeable Nickel-Metal Hydride battery (AD-N55BT) x 1 DC 5V: AC adaptor (AC 220 - 230V, 50/60 Hz) [MD-MT866H(S) Except for U.K.] DC 5V: AC adaptor (AC 230 - 240V, 50/60 Hz) [MD-MT866H(S) for U.K.] DC 5V: AC adaptor (AC 110 - 240V, 50/60 Hz) [MD-MT866W(S)] DC 1.5V: Commercially available, “AA”...
  • Page 4: Names Of Parts

    MD-MT866H/MD-MT866W NAMES OF PARTS Main unit 1. Volume/Cursor/Bass/Delete Left Shuttle Switch 2. Display/Character Select Button 3. Stop/Power Off/Hold Button 4. Rechargeable Battery Cover 5. Mode Button 6. Edit/Auto Mark/Time Mark Button 7. Enter/Fast Play/Synchro/Fast Forward/Fast Reverse/ Recording Level/Name Select Right Shuttle Switch 8.
  • Page 5 MD-MT866H/MD-MT866W Remote control unit 1. Earphones Socket 2. Fast Forward/Fast Reverse Button 3. Display Button 4. Play Mode Button 5. Sound/Track Mark Button 6. Stop/Power Off Button 7. Play/Pause Button 8. Volume Button 9. Hold Switch Remote control display panel 01.
  • Page 6: Operation Manual

    MD-MT866H/MD-MT866W OPERATION MANUAL MD-MT866H(S) Except for U.K. Using with the Rechargeable Battery Charging When the rechargeable battery is used for the first Do not force the time or when you want to use it after a long period of battery cover disuse, be sure to charge it fully.
  • Page 7 MD-MT866H/MD-MT866W MD-MT866W(S) Using with the Rechargeable Battery Charging Do not force the When the rechargeable battery is used for the first battery cover time or when you want to use it after a long period of open too far. disuse, be sure to charge it fully.
  • Page 8 MD-MT866H/MD-MT866W Error Messages ERROR MESSAGES MEANING REMEDY BATT EMPTY The battery is run down. Charge the rechargeable battery or replace the alkaline battery (LoBATT) (or use the AC adaptor for power). BLANK MD Nothing is recorded. Replace the disc with a recorded disc.
  • Page 9 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 10 MD-MT866H/MD-MT866W Connect the AC adaptor Insert a MiniDisc Insert according to the direction arrow. MD-MT866H(S) for U.K. AC 230-240V 50/60 Hz RELEASE LOCK To the DC IN 5V socket. Insert securely, all the way in. Slide the OPEN lever to re- Insert a MiniDisc as shown.
  • Page 11 MD-MT866H/MD-MT866W Preparation for use Recording Check that the unit is connected to the stereo system. The unit does not work if the • / :OFF button is set to HOLD. Press the • / :OFF button for 2 seconds or more.
  • Page 12: Disassembly

    MD-MT866H/MD-MT866W DISASSEMBLY Cares before disassembling (B1)x2 Top Cabinet ø1.4x2mm When assembling the machine after disassembling or (A1)x2 repair, observe the following requirements so as to ensure ø1.4x2mm safety and performance. 1. Remove the batteries from the machine, and take out the (A1)x2 mini-disc.
  • Page 13: Removing And Reinstalling The Main Parts

    MD-MT866H/MD-MT866W REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling meth- (A2)x3 ods 1 to 4. (See Page 12.) ø1.4x3mm How to remove the spindle motor (See Fig. 13-1.) 1. Remove the solder joints (A1) x 4 of flexible PWB.
  • Page 14: Adjustment

    MD-MT866H/MD-MT866W 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-213A (TEAC Test MD)
  • Page 15 MD-MT866H/MD-MT866W Operation in each TEST mode 1. AUTO1 Mode • When the STOP button is pressed while the AUTO1 menu appears or during automatic adjustment, the mode changes to the TEST mode stop state. At this time the adjustment value is not output.
  • Page 16 MD-MT866H/MD-MT866W 6. TEST-REC Mode • When the STOP button is pressed while the TEST-REC menu appears, or in the TEST-REC mode or continuous record mode, the mode changes to the TEST mode stop state. • Whenever the DISP button is pressed in the TEST-REC menu, the target address changes as follows.
  • Page 17 MD-MT866H/MD-MT866W EEPROM (IC402) writing procedure 1. Procedure to replace EEPROM and write initial value of microcomputer in EEPROM (1) Replace EEPROM. (2) Refer to the latest EEPROM data list. (3) Start the test mode. (Refer to "How to enter the test mode".) (4) Version display (At the time of settlement of the test mode by the button operation.)
  • Page 18 MD-MT866H/MD-MT866W EEPROM DATA LIST (EEPROM version g) Fucus setting Tracking setting Item display Item display Set values Set values FG1 _ TOP _ FG2 _ TOG _ FF0 _ T1P _ FF1 _ (RESERVE) FF2 _ (RESERVE) (RESERVE) (RESERVE) FZH _...
  • Page 19 MD-MT866H/MD-MT866W Sled setting Digital EQ setting Item display Item display Set values Set values SKS _ AHl _ SKL _ AHu _ SLC _ BHl _ STL _ BHu _ STM _ EHl _ STE _ EHu _ SDV _...
  • Page 20 MD-MT866H/MD-MT866W Sled setting Sled setting Item display Item display Set values Set values CT0 _ (RESERVE) CT1 _ (RESERVE) CT2 _ (RESERVE) CT3 _ (RESERVE) RC0 _ (RESERVE) RC1 _ (RESERVE) SYC _ (RESERVE) PWL _ (RESERVE) DR1 _ (RESERVE)
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  • Page 28: Notes On Schematic Diagram

    MD-MT866H/MD-MT866W NOTES ON SCHEMATIC DIAGRAM • Resistor: DESCRIPTION POSITION To differentiate the units of resistors, such symbol as K and REF. NO M are used: the symbol K means 1000 ohm and the symbol SW401 EJECT OFF—ON M means 1000 kohm and the resistor without any symbol is...
  • Page 29: Block Diagram

    MD-MT866H/MD-MT866W J702 MIC IN J703 J703 J701 J701 (READY FOR HEADPHONES REMOTE TERMINAL OPTICAL IN LINE IN PLUG/IN POWER) TERMINAL 2,5,6,7 Figure 29 BLOCK DIAGRAM – 29 –...
  • Page 30: Schematic Diagram

    MD-MT866H/MD-MT866W MAIN PWB-A C109 C107 C106 C110 C111 C114 R111 C108 TP202 C112 0.22 TP139 (CH) PLAYBACK SIGNAL 48 47 46 45 44 43 42 41 40 39 38 37 CK203 RECORD SIGNAL 1234 BIAS VCC1 EFMO C131 CK202 XL201...
  • Page 31 MD-MT866H/MD-MT866W LCD PWB-B LCD UNIT SWA01 RECORD SWA02 PLAY RA01 5.6K CNA01 7 6 5 4 3 2 1 SWA04 EDIT RA02 SWA06 DISPLAY 8.2K RA03 SWA05 CA02 RA04 VOLUME DOWN 0.01 SWA13 OPEN RA13 DADATA CN451 RA14 ADDATA TP451...
  • Page 32: Wiring Side Of P.w.board

    MD-MT866H/MD-MT866W MAIN PWB-A (BOTTOM VIEW) EXTENSION EXTENSION CONTROL BATTERY TERMINAL,+ TERMINAL TERMINAL,– TERMINAL,+ TP206 BATTERY TERMINAL,+ TP804 TP805 C202 R282 TP803 R281 TP200 L202 R151 Q251 Q103 C151 TP801 L100 TP100 TP404 C100 TP841 TP113 TP109 TP118 TP114 Q252 C113...
  • Page 33 MD-MT866H/MD-MT866W MAIN PWB-A (TOP VIEW) R251 19 20 IC801 R263 Q801 IC251 FROM Q804 OPTICAL PICKUP R881 R806 P35 9-G Q261 Q821 IC202 Q254 R273 IC271 Q825 R276 C273 C272 R258 FLEXIBLE Q802 Q803 R807 R278 R255 Q807 R277 C274...
  • Page 34 MD-MT866H/MD-MT866W LCD PWB-B (TOP VIEW) TO MAIN PWB LCD UNIT P35 8-H SWA13 OPEN CK23 CK26 CK22 CA01 CK24 RA14 CK25 RA13 RA12 RA08 CA02 RA04 CNA01 RA06 RA03 RA07 RA05 RA02 RA01 RA15 QA01 CK14 CK13 CK11 CK12 CK10...
  • Page 35 MD-MT866H/MD-MT866W M902 CN601 TO MAIN PWB SLED MOTOR P33 12-D MAGNETIC HEAD UNIT(3) M903 LIFT MOTOR MECHANISM FLEXIBLE PWB(5) M901 SPINDLE MOTOR LCD(216) OPTICAL PICKUP(4) CN101 TO MAIN PWB P33 12-A CNA01 TO LCD PWB P35 4-D Figure 35 WIRING OF P.W.BOARD (4/4)
  • Page 36: Voltage

    MD-MT866H/MD-MT866W VOLTAGE IC501 IC101 IC201 IC401 IC601 IC701 VOLTAGE PIN VOLTAGE PIN VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE 0.79V 0.26V 1.24V 2.16V 2.49V 0.26V 2.47V 0.42V 1.3V 0.26V 2.35V 1.24V 0.26V 2.33V 3.73V 2.3V 2.49V 1.25V 2.5V 2.33V 1.25V 1.25V 1.25V...
  • Page 37: Waveforms Of Md Circuit

    MD-MT866H/MD-MT866W WAVEFORMS OF MD CIRCUIT Stopped 1994 / 12 / 15 22:54:19 Stopped 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...
  • Page 38: Troubleshooting

    MD-MT866H/MD-MT866W TROUBLESHOOTING It is advisable to use the TEST mode (refer to Error Data Display Mode, P19) 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 39 MD-MT866H/MD-MT866W • Abnormal display Is waveform output from CN451 pins 3 to 5? Is waveform output from IC401 pins 9, 11, 13? Are the pin 2 (VCC) and pin 12, 13 (GND) normal? Check between IC401 and Check the periphery of IC401.
  • Page 40 MD-MT866H/MD-MT866W • Recording/playback operation Insert a low reflection disc, and ascertain audio output by normal playback, and then set TEST REC mode. Change MSL from 00H to 80H by the control setting of EEPROM. After completing the operation, return in to 00H.
  • Page 41: Function Table Of Ic

    MD-MT866H/MD-MT866W FUNCTION TABLE OF IC IC401 RH-iX0357AWZZ :System Microcomputer (IX0357AW) (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...
  • Page 42 MD-MT866H/MD-MT866W IC401 RH-iX0357AWZZ :System Microcomputer (IX0357AW) (2/2) Terminal Name Input/Output Function Pin No. Port Name 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...
  • Page 43 MD-MT866H/MD-MT866W IC201 VHiLR37815+-1 :Endec/Servo/Atrac (LR37815) System LSI expansion output port (LR37815) Terminal Name Input/Output Pin No. Port Name 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.
  • Page 44 MD-MT866H/MD-MT866W IC601 VHiBD6606KV-1 :Motor Driver (BD6606KV) (1/2) Pin No. Terminal Name Function SPWIN SPIN detection comparator input (W phase) SPCOM SPIN motor coil's mid-point input terminal EXTCLK Synchronization clock input terminal CHARGEPUMP capacitor 1 connection terminal+ CHARGEPUMP capacitor 1 connection terminal–...
  • Page 45 MD-MT866H/MD-MT866W IC601 VHiBD6606KV-1 :Motor Driver (BD6606KV) (2/2) Pin No. Terminal Name Function BRK+ Brake comparator input (–) BRK+ Brake comparator input (+) VCC2 Small-signal section power terminal 2 (Bip.) VCC1 Small-signal section power terminal 1 (MOS) SPVM1 Spindle power section power supply 1...
  • Page 46 MD-MT866H/MD-MT866W — M E M O — – 46 –...
  • 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-MT866H/MD-MT866W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK INTEGRATED CIRCUITS COILS AC 10 µH IC101 VHIIR3R58M/-1 AM RF Signal Processor,IR3R58M L100 VPBNN100K0000 AC 10 µH IC200 VHI62GR2522-1 AG 2.5V Regulator,62GR2522 L171 RCILC0356AFZZ AC 10 µH IC201 VHILR37815+-1...
  • Page 49 MD-MT866H/MD-MT866W PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK AB 0.1 µF,10V C605 VCKYCZ1AB104K R161 VRS-CZ1JB122J AB 1.2 kohms,1/16W AD 1 µF,10V C608 VCKYTV1AB105K R200 VRS-CZ1JB104J AA 100 kohm,1/16W AC 1 µF,6.3V C609 VCKYCY0JB105K R204 VRS-CZ1JB102J AB 1 kohm,1/16W AB 0.1 µF,10V...
  • Page 50 MD-MT866H/MD-MT866W PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK MD MECHANISM PARTS R807 VRS-CZ1JB104J AA 100 kohm,1/16W R808 VRS-CZ1JB564J AA 560 kohms,1/16W R809 VRS-CZ1JB473J AA 47 kohms,1/16W NGERH0125AWZZ J AB Wheel,Drive R810 VRS-CZ1JB223J AB 22 kohms,1/16W NSFTD0007AWZZ AL Screw,Drive...
  • Page 51 MD-MT866H/MD-MT866W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK ACCESSORIES/PACKING PARTS (MD-MT866H) CHARGING STAND PARTS GCASZ0002AWSA J AL Battery Case RUNTZ0028AWS1 J Charging Stand RADPA7045AWZZ J AX AC Adapter [Except for U.K.] 22- 1 GCABA1223AWSA J AF Front Cabinet RADPA8046AWZZ J AY AC Adapter [For U.K.]...
  • Page 52 MD-MT866H/MD-MT866W 501X2 506X3 504X2 M901 M902 M903 Figure 5 MD MECHANISM EXPLODED VIEW – 5 –...
  • Page 53 MD-MT866H/MD-MT866W MD MECHANISM 604x2 604x2 227x2 MAIN PWB 226x2 228x4 602 244 LCD PWB 604x2 603x2 Figure 6 CABINET EXPLODED VIEW – 6 –...
  • Page 54 MD-MT866H/MD-MT866W 22-1 22-7 22-6 22-7 22-3 22-4 22-5x2 22-2 22-5x2 Figure 7 BATTERY STAND EXPLODED VIEW – 7 –...
  • Page 55 MD-MT866H/MD-MT866W PACKING METHOD (MD-MT866H(S) FOR U.K. ONLY) TiNSE0334AWZZ Operation Manual Setting position of switches and knobs TiNSE0336AWZZ Quick Guide Remote Control HOLD CANCEL SPAKZ0699AWZZ AC Adapter Pad GCASZ0002AWSA Battery Case TLABZ0695AWZZ Label, Caution RADPA8046AWZZ AC Adapter TCAUH0072AWZZ Sheet, Caution RPHoH0176AFSA...
  • Page 56 MD-MT866H/MD-MT866W © COPYRIGHT 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.
  • Page 57 “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 58 MD-MT866H/MD-MT866W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK INTEGRATED CIRCUITS COILS AC 10 µH IC101 VHIIR3R58M/-1 AM RF Signal Processor,IR3R58M L100 VPBNN100K0000 AC 10 µH IC200 VHI62GR2522-1 AG 2.5V Regulator,62GR2522 L171 RCILC0356AFZZ AC 10 µH IC201 VHILR37815+-1...
  • Page 59 MD-MT866H/MD-MT866W PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK AB 0.1 µF,10V C605 VCKYCZ1AB104K R161 VRS-CZ1JB122J AB 1.2 kohms,1/16W AD 1 µF,10V C608 VCKYTV1AB105K R200 VRS-CZ1JB104J AA 100 kohm,1/16W AC 1 µF,6.3V C609 VCKYCY0JB105K R204 VRS-CZ1JB102J AB 1 kohm,1/16W AB 0.1 µF,10V...
  • Page 60 MD-MT866H/MD-MT866W PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK MD MECHANISM PARTS R807 VRS-CZ1JB104J AA 100 kohm,1/16W R808 VRS-CZ1JB564J AA 560 kohms,1/16W R809 VRS-CZ1JB473J AA 47 kohms,1/16W NGERH0125AWZZ J AB Wheel,Drive R810 VRS-CZ1JB223J AB 22 kohms,1/16W NSFTD0007AWZZ AL Screw,Drive...
  • Page 61 MD-MT866H/MD-MT866W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK ACCESSORIES/PACKING PARTS (MD-MT866H) CHARGING STAND PARTS GCASZ0002AWSA J AL Battery Case RUNTZ0028AWS1 J Charging Stand RADPA7045AWZZ J AX AC Adapter [Except for U.K.] 22- 1 GCABA1223AWSA J AF Front Cabinet RADPA8046AWZZ J AY AC Adapter [For U.K.]...
  • Page 62 MD-MT866H/MD-MT866W 501X2 506X3 504X2 M901 M902 M903 Figure 5 MD MECHANISM EXPLODED VIEW – 5 –...
  • Page 63 MD-MT866H/MD-MT866W MD MECHANISM 604x2 604x2 227x2 MAIN PWB 226x2 228x4 602 244 LCD PWB 604x2 603x2 Figure 6 CABINET EXPLODED VIEW – 6 –...
  • Page 64 MD-MT866H/MD-MT866W 22-1 22-7 22-6 22-7 22-3 22-4 22-5x2 22-2 22-5x2 Figure 7 BATTERY STAND EXPLODED VIEW – 7 –...
  • Page 65 MD-MT866H/MD-MT866W PACKING METHOD (MD-MT866H(S) FOR U.K. ONLY) TiNSE0334AWZZ Operation Manual Setting position of switches and knobs TiNSE0336AWZZ Quick Guide Remote Control HOLD CANCEL SPAKZ0699AWZZ AC Adapter Pad GCASZ0002AWSA Battery Case TLABZ0695AWZZ Label, Caution RADPA8046AWZZ AC Adapter TCAUH0072AWZZ Sheet, Caution RPHoH0176AFSA...

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