Sharp MD-MT831H(GL) Service Manual
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Sharp MD-MT831H(GL) Service Manual

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Illustration: MD-MT831H
Illustration: MD-MT831W
Safety Precaution For Service Manual ............................................................................................................... 2
SPECIFICATIONS ................................................................................................................................................................. 3
NAMES OF PARTS ............................................................................................................................................................... 4
OPERATION MANUAL .......................................................................................................................................................... 5
QUICK GUIDE ....................................................................................................................................................................... 8
DISASSEMBLY .................................................................................................................................................................... 10
Removing And Reinstalling The Main Parts ....................................................................................................... 11
Adjustment ...................................................................................................................................................................... 12
Md Error Message Display Content List ........................................................................................................... 26
BLOCK DIAGRAM ............................................................................................................................................................... 27
Schematic Diagram ...................................................................................................................................................... 28
Voltage ............................................................................................................................................................................ 31
WIRING SIDE OF P.W.BOARD ........................................................................................................................................... 32
Waveforms Of Md Circuit ......................................................................................................................................... 35
Notes On Schematic Diagram .................................................................................................................................. 36
Types Of Transistor And Diode .............................................................................................................................. 36
Trouble Shooting ........................................................................................................................................................ 37
Function Table Of Ic .................................................................................................................................................... 40
Parts Guide/EXPLODED VIEW
SERVICE MANUAL
CONTENTS
SHARP CORPORATION
– 1 –
MD-MT831H(GL)
MD-MT831W(GL)
• 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. SX963MDMT831H
Page

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Summary of Contents for Sharp MD-MT831H(GL)

  • Page 1 FUNCTION TABLE OF IC ..............................40 PARTS GUIDE/EXPLODED VIEW PACKING METHOD (MD-MT831H 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. – 1 –...

  • Page 2: Safety Precaution For Service Manual

    MD-MT831H/W SAFETY PRECAUTION FOR SERVICE MANUAL 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. (1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position outer than the lead-in position, the Laser will light for several seconds to detect a disc.
  • Page 3 MD-MT831H/W – 6 –...
  • Page 4 MD-MT831H/W – 7 –...
  • Page 5 MD-MT831H/W – 8 –...

  • Page 6: Removing And Reinstalling The Main Parts

    MD-MT831H/W REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling meth- ods 1 to 5. (See Page 10.) How to remove the spindle motor (See Fig. 11-1.) (A2)x3 1. Remove the solder joint (A1) x 4 of flexible PWB. ø1.4x2.8mm 2.

  • Page 7: Test Mode

    MD-MT831H/W 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) 88GMMD-213A Low reflection disc Recording minidisc...
  • Page 8 MD-MT831H/W 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 9 MD-MT831H/W 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. • When the PLAY button is pressed while the TEST-REC menu appears, the continuous record is initiated from the current pickup position. •...
  • Page 10 MD-MT831H/W 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 [ V e r .
  • Page 11 MD-MT831H/W EEPROM DATA LIST (EEPROM version c) Fucus setting Spindle setting Item display Set values Item display Set values F G 1 _ S P G _ F G 2 _ S P i _ F F 0 _ S P m _ F F 1 _ S P o _ F F 2 _...
  • Page 12 MD-MT831H/W ADJ. SET setting Control setting Item display Item display Set values Set values C O K _ C T 0 _ F A T _ C T 1 _ T A T _ C T 2 _ C A T _ C T 3 _ F A B _ R C 0 _...
  • Page 13 MD-MT831H/W Test Mode Change Chart Tset Mode Menu T E S T : Test Mode STOP SKIP UP SKIP DOWN Slide external Slide internal periphery move periphery move BASS SKIP DOWN A U T O 1 : Pre-auto adjustment menu SKIP UP SKIP DOWN A U T O 2...
  • Page 14 MD-MT831H/W Preautomatic Adjustment A U T O 1 : Preautomatic Adjustment menu PLAY A T 1 : During preadjustment adjustment Adjustment error A D J . N G Normal end : Preadjustment error (adjustment value output) A D J . O K : Preadjustment normal end (adjustment value output) PLAY A T 2...
  • Page 15 MD-MT831H/W Pre-Manual Adjustment M A N U 1 : Pre-Manual Adjustment menu PLAY : Temperature code display T M P : Temperature code SKIP UP SKIP DOWN : A signal offset (AINO) tentative measurement : Measurement value SKIP UP SKIP DOWN : B signal offset (BINO) tentative measurement : Measurement value SKIP UP...
  • Page 16 MD-MT831H/W ATT Manual Adjustment M A N U 2 : ATT manual adjustment menu PLAY : Temperature code display T M P : Temperature code SKIP UP SKIP DOWN : Laser ON (Play Power) L O N SKIP UP SKIP DOWN : Pit section E-ATT (tracking) setting : ATT setting SKIP UP...
  • Page 17 MD-MT831H/W Continuous Playback • Continuous playback from current pickup position P L A Y : Continuous playback menu PLAY S Q # # # # : Continuous playback (pit section) : Continuous playback (groove section) A P # # # # # # # # : Address •...
  • Page 18 MD-MT831H/W 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 19 MD-MT831H/W Test Mode Normal Playback N O R M A L : TEST mode normal playback menu PLAY : Continuous playback @@@@@@ @@@@@@: Mode and address display * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the NORMAL mode is canceled, the power is turned off.
  • Page 20 MD-MT831H/W EEPROM Setting E E P R O M : EEPROM setting menu PLAY SKIP DOWN T E M P : TEMP setting menu SKIP UP SKIP DOWN F o c u s : Focus setting menu SKIP UP SKIP DOWN T r a c k : Tracking setting menu SKIP UP...
  • Page 21 MD-MT831H/W TEMP Setting T e m p : Temp setting menu PLAY : TEMP reference T M § § : Reference § § : Temperature code SKIP UP SKIP DOWN : 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 22 MD-MT831H/W Figure 27 BLOCK DIAGRAM – 27 –...
  • Page 23 MD-MT831H/W P29 P30 1234 VCC1 GND1 BIAS EFMAGC ADAGI DIFF ADAGC ADIPNF REFI ADIPO GND2 REFO AOUT BIAS VCC2 SENSE OPICPW DISC MODE DISC DINT SGAIN SGAIN TEMP SYD0 SYD1 SYD2 SYD3 SYD4 SYD5 SYD6 SYD7 SYWR SYRD SYRS L171 10µH LDON LDVAR...
  • Page 24 MD-MT831H/W DADATA ADDATA DFCK BCLK LRCK ADPON DAPON OPTCNT EMPH1 TOTMON EFMO TEMON PLCK DADATA DCNT ACRCER OPTCNT RAA11 X700KO FEMON DAPON RAD0 TCRS ADPON RAD1 RAWEX SENSE RARASX SENSE COUT RAA9 MCCK RAD3 DINT RAD2 DINTX VDD2 RACASX DGND DGND RSTX RAOEX...
  • Page 25 MD-MT831H/W VOLTAGE IC101 IC201 IC401 IC601 IC701 IC830 VOLTAGE PIN VOLTAGE PIN VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE 0.38V 0.27V 1.25V 0.90V 2.50V 2.20V 1.43V 1.25V 0.27V 1.25V 0.50V 2.50V 2.36V – – 1.24V – 2.36V – 2.35V 0.27V – 2.00V –...
  • Page 26 MD-MT831H/W J701 OPTICAL/LINE JACK TP705 JACK PWB-A2 FLAT CABLE(217) TP703 MAIN PWB-A1 (BOTTOM VIEW) TP701 (BOTTOM VIEW) TP761 TP484 TP481 TP480 TP772 TP704 TP479 TP702 TP708 TP200 TP477 TP762 TP352 TP707 TP471 TP202 C713 R715 TP482 TP456 TP483 TP478 TP457 TP476 TP475 TP211...
  • Page 27 MD-MT831H/W TO MAIN PWB P32 4-H OPTICAL CN601 PICKUP UNIT(15) SW901 M903 DISC PROTECT(8-2) LIFT MOTOR PH901 PHOTE INTERRUPTER (8-3) CN101 M902 TO MAIN PWB SPINDLE MOTOR P32 2-H MECHANISM FLEXIBLE PWB Ass'y(8) LCD Ass'y(235) M901 SLED MOTOR TO MAIN PWB MAGNETIC HEAD(21) P32 4-B CN451...

  • Page 28: Waveforms Of Md Circuit

    MD-MT831H/W WAVEFORMS OF MD CIRCUIT Stopped 1994 / 12 / 15 22:54:19 CH1=1mV CH2=500mV CH3=5V CH4=2V 50ms/div DC 10:1 DC 10:1 DC 10:1 DC 10:1 (50ms/div) NORM:200kS / s TP208 (FEOUT) TP122 (F+) CK205 (SENSE) CK204 (FOK) =Filter= =Offset= =Record Length= =Trigger= Smoothiing : OFF CH1 :...

  • Page 29: Notes On Schematic Diagram

    MD-MT831H/W 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 30: Trouble Shooting

    MD-MT831H/W TROUBLE SHOOTING It is advisable to use the TEST mode (refer to Error Data Display Mode, P14) 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 31 MD-MT831H/W • Abnormal display Is waveform output from CN451 pins 1 to 3? Is waveform output from IC401 pins 9,11,13? Are the pin10 (VCC) and pin 6 (GND) normal? Check the periphery of IC401. Check between IC401 and CN451. Check for pattern breakage of flexible PWB, check for defects of display microcomputer (replace the display unit).
  • Page 32 MD-MT831H/W • 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 64? Does waveform appear on IC601 pins 25, 27 and 29? L608, IC201, IC601, CN601 and flex, etc.
  • Page 33 MD-MT831H/W FUNCTION TABLE OF IC IC202 RH-iX2824AFZZ: 16 Bit D-RAM (IX2824AF) Function Terminal Name Pin No. Power supply (2.6V) Data input/data output Data input/data output Write enable Low address strobe Not connected Address input 8-11 A0-A3 Address input Power supply (2.6V) Ground (0V) 14-19 A4-A9...
  • Page 34 MD-MT831H/W IC401 RH-iX2823AF04 :System Microcomputer (IX2823AF) (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 Output (not used) DISCPR Input Disc record inhibition switch input TIOCA2 SPWDS Input...
  • Page 35 MD-MT831H/W IC401 RH-iX2823AF04 :System Microcomputer (IX2823AF) (2/2) Port Name Terminal Name Input/Output Function Pin No. WDTOVF WDTOVF Output Watch dog timer (not used) Input Operation mode selection input 2 _RESET Input Microcomputer hard reset input _NMI Input Nonmaskable interruption (not used) STBY _STBY Input...
  • Page 36 MD-MT831H/W IC601 VHiBD6603KV-1: Drive Servo/Motor Control (BD6603KV) (1/2) Function Terminal Name Pin No. PWIN2 Half bridge 2 input IN1F Half bridge 1 forward input IN1R Half bridge 1 reverse input IN2F Half bridge 2 forward input IN2R Half bridge 2 reverse input H1PG2 Half bridge 1 power section GND 2 H1ROUT...
  • Page 37 MD-MT831H/W IC601 VHiBD6603KV-1: Drive Servo/Motor Control (BD6603KV) (2/2) Function Terminal Name Pin No. CHARGEPUMP capacitor 1 connection termina l - CHARGEPUMP capacitor 1 connection terminal + EXTCLK Synchronous clock input terminal STHB Half bridge mute terminal STALL Stand-by terminal VCC1 Small signal section power supply terminal 1 (MOS) VCC2 Small signal section power supply terminal 2 (Bip.)
  • Page 38 “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 39 MD-MT831H/W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK INTEGRATED CIRCUITS VHI7WH74FK/-1 AE Flip Flop IC,7WH74FK IC101 VHIIR3R58M/-1 AM RF Signal Processor,IR3R58M IC200 VHI62FP2502-1 AE Power Drive,62FP2502 IC201 VHILR37812/-1 BA Encode/Decode/Servo Atrac, LR37812 IC202 RH-IX2824AFZZ AX 16Bit D-RAM,IX2824AF IC203 VHI62FP1702-1 AE 1.7V Regulator,62FP1702...
  • Page 40 MD-MT831H/W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK AB 1 µF,10V C753 VCKYCY1AF105Z R412 VRS-CY1JB153J AA 15 kohms,1/16W AC 1 µF,6.3V C754 VCKYCY0JB105K R413~416 VRS-CY1JB102J AA 1 kohm,1/16W AC 1 µF,16V,Ceramic C758 RC-KZ1184AFZZ R422 VRS-CY1JB104J AA 100 kohm,1/16W AB 0.1 µF,16V C760 VCKYCY1CB104K...
  • Page 41 MD-MT831H/W PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK J703 QJAKM0205AFZZ AH Jack,Remote Control/ JKNBZ2212AFSA AF Button,Play Headphones JKNBZ2213AFSA AF Button,Record Level J801 QJAKC0146AFZZ AE Jack,DC In JKNBZ2214AFSA AF Button,Volume M901 RMOTV0529AFZZ AS Motor Ass’y [Sled] JKNBZ2215AFSA AC Button,Record M902 RMOTV0530AFZZ AS Motor Ass’y [Spindle]...
  • Page 42 MD-MT831H/W PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK TLABN1581AF01 AC Label,Serial No. [MD-MT831W for Hong Kong] TLABN1582AF01 AC Label,Serial No. [MD-MT831W Except for Hong Kong/ Australia/ New Zealand] TLABN1583AF02 Label, Serial No. [MD-MT831W for Australia/ New Zealand] TLABS0478AFZZ AC Label,CPA [MD-MT831W Except for Hong Kong]...
  • Page 43 MD-MT831H/W (PH901) 8-2(SW901) 513x2 503x2 508x3 M902 M901 M903 Figure 5 MD MECHANISM EXPLODED VIEW – 5 –...
  • Page 44 MD-MT831H/W MD MECHANISM 601x2 601x2 601x2 PWB-A2 PWB-A1 601x2 601x2 Figure 6 CABINET EXPLODED VIEW – 6 –...
  • Page 45 17. Quick Guide TiNSE1654AFZZ 18. Serial No. Label, Packing Case TLABN1578AF02 © COPYRIGHT 1999 BY SHARP CORPORATION ALL RIGHTS RESERVED. SHARP CORPORATION Communication Systems Group Quality & Reliability Control Center No part of this publication may be reproduced, Higashihiroshima, Hiroshima 739-0192, Japan...

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