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Sharp MD-MT180 Service Manual

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SPECIFICATIONS ................................................................................................................................................................. 2
NAMES OF PARTS ............................................................................................................................................................... 3
OPERATION MANUAL .......................................................................................................................................................... 4
DISASSEMBLY ...................................................................................................................................................................... 9
REMOVING AND REINSTALLING THE MAIN PARTS ....................................................................................................... 10
ADJUSTMENT ...................................................................................................................................................................... 12
MD ERROR MESSAGE DISPLAY CONTENT LIST ........................................................................................................... 25
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 26
TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 26
BLOCK DIAGRAM ............................................................................................................................................................... 27
SCHEMATIC DIAGRAM ...................................................................................................................................................... 28
WIRING SIDE OF P.W.BOARD ........................................................................................................................................... 32
VOLTAGE ............................................................................................................................................................................ 43
WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 44
TROUBLESHOOTING ......................................................................................................................................................... 45
FUNCTION TABLE OF IC .................................................................................................................................................... 48
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
MODEL
CONTENTS
SHARP CORPORATION
MD-MT180(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.
MD-MT180
No. S4224MDMT180S
Page

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  • Page 1: Table Of Contents

    MD-MT180 SERVICE MANUAL No. S4224MDMT180S PORTABLE MINIDISC RECORDER MD-MT180(S) MODEL • In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used. CONTENTS Page SPECIFICATIONS ................................. 2 NAMES OF PARTS ................................3 OPERATION MANUAL ................................

  • Page 2: Specifications

    MD-MT180 FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS Power source: DC 1.2 V: Rechargeable Nickel-Metal Hydride battery (AD-N55BT) x 1 DC 5 V: AC adaptor (AC 120 V, 60 Hz) DC 1.5 V:...

  • Page 3: Names Of Parts

    MD-MT180 NAMES OF PARTS 1. Battery Case Connection Terminals 2. 5 V DC Input Jack 3. Optical/Line Input Jack 4. Earphones/Line Output Jack 5. Record/Track Mark Button 6. Menu/Charge Button 7. Bass/Delete Button 8. Enter/Fast Play/Synchro Button 9. Volume/Cursor/Fast Forward/Fast Reverse/ Recording Level/ Name Select Button 10.

  • Page 4: Using With The Rechargeable Battery

    MD-MT180 OPERATION MANUAL Using with the Rechargeable Battery Charging the rechargeable battery When the rechargeable battery is used for the first time Do not force the Insert the or when you want to use it after a long period of disuse, battery cover –...

  • Page 5: Error Messages

    MD-MT180 Error Messages ERROR MES- MEANING ERROR MES- MEANING SAGES SAGES BATT ENPTY The battery has run down. Can'tSTAMP Stamp function does not work. BLANK MD Nothing is recorded. (Check the number of tracks.) (Replace the disc with a recorded disc.)

  • Page 6: Minidisc System Limitations

    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 authorized SHARP dealer or service center. The unit does not turn on.

  • Page 7: Inserting A Minidisc

    MD-MT180 Connect the AC adaptor Inserting a MiniDisc Inserción de un minidisco Conecte el adaptador de CA AC 120V, 60 Hz Insert according to the direction of the arrow. 120V CA, 60Hz Insértelo de acuerdo con la dirección de la flecha.
  • Page 8 MD-MT180 Recording / Grabación Check that the unit is connected to the stereo system. Press the MENU/CHRG button repeatedly to select the "REC MODE". Compruebe que el aparato esté conectado al sistema estéreo. Pulse repetidamente el botón MENU/CHRG para seleccionar "REC MODE".

  • Page 9: Disassembly

    MD-MT180 DISASSEMBLY Cares before disassembling When assembling the machine after disassembling or (A1) x1 repair, observe the following requirements so as to ensure ø1.4 x2.5mm safety and performance. 1. Remove the batteries from the machine, and take out the Top Cabinet mini-disc.

  • Page 10: Removing And Reinstalling The Main Parts

    MD-MT180 REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling meth- ods 1 to 4. (See Page 9.) How to remove the magnetic head (See Fig. 10-1.) (A2) x2 ø1.4 x1.8mm Magnetic Head 1. Remove the solder joints (A1) x 2 of the head flexible plate.
  • Page 11 MD-MT180 How to remove the Lift motor (See Fig. 11-1.) 1. Remove the solder joints (D1) x 2 of the lift motor lead wire. 2. Remove the screw (D2) x 1 pc., and remove the lift motor. Lift Motor Note: Take care so that the motor gear is not damaged.

  • Page 12: Adjustment

    MD-MT180 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...
  • Page 13 MD-MT180 • Whenever the MENU 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...
  • Page 14 MD-MT180 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...
  • Page 15 MD-MT180 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 16 MD-MT180 Sled setting EEPROM DATA LIST (EEPROM version c) (Continued) TEMP setting Item display Set values Item display Set values S K E _ T M _ _ Calculate values S D E _ Focus setting B P E _...
  • Page 17 MD-MT180 Test Mode Change Chart Test 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...
  • Page 18 MD-MT180 ATT Auto Adjustment A U T O 2 : ATT auto adjustment menu PLAY A T 2 : During ATT auto adjustment Adjustment error A D J . N G Normal end : ATT adjustment error (adjustment value output) A D J .
  • Page 19 MD-MT180 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...
  • Page 20 MD-MT180 Error History Display • Error history clear D A T A : Error history display menu MENU C L E A R : Error history clear • Error history display D A T A : Error history display menu PLAY E 0 §...
  • Page 21 MD-MT180 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...
  • Page 22 MD-MT180 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...
  • Page 23 MD-MT180 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 24 MD-MT180 Control Setting C T R L : Control setting menu PLAY C T 0 FAST FORWARD FAST REVERSE C T 1 U S 2 FAST FORWARD FAST REVERSE FAST REVERSE FAST FORWARD C T 2 U S 1 FAST FORWARD...

  • Page 25: Md Error Message Display Content List

    MD-MT180 MD ERROR MESSAGE DISPLAY CONTENT LIST Remarks Error content Error code Display content Can' t READ* Readout of the information is not completed. f: Focus error r: READ ERR Can' t READ* Readout of the TOC information * indicates the detailed factor.

  • Page 26: Notes On Schematic Diagram

    MD-MT180 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 27: Block Diagram

    MD-MT180 VCC+2.5V PCNT1 +4.5V Figure 27 BLOCK DIAGRAM – 27 –...

  • Page 28: Schematic Diagram

    MD-MT180 MAIN PWB-A PLAYBACK SIGNAL RECORD SIGNAL C111 C109 IC101 TP202 IR3R58M CK139 C221 EFMO RF SIGNAL 1234 (CH) CK203 C131 PROCESSOR BIAS CK202 XL201 33.8688MHz ADAGI C211 CK201 5P(CH) ADAGC DIFF C102 C132 ADIPNF 0.22 CK108 ADIPO REFI C212...
  • Page 29 MD-MT180 LCD UNIT TP451 BASS (229) HREC TP452 R456 R457 TP453 MENU 5.6K 8.2K HKEY2 R458 TP454 DOLBY TP455 ENTER TP456 STOP HPLAY TP457 PLAY DADATA TP458 SKIP DOWN ADDATA HKEY1 R453 TP459 VOL DOWN DFCK TP460 VOL UP R451 R452 5.6K 8.2K...
  • Page 30 MD-MT180 SUB PWB-B 1SS385 CK13A 1SS385 1413121110 9 8 8 7 6 5 MAIN PWB VERSION MAIN PWB-A 1 2 3 4 5 6 7 1 2 3 4 100P (CH) CK14 CK16 CK13 R720 R712 6.8K 6.8K R719 R711 6.8K...
  • Page 31 MD-MT180 1SS385 1SS385 1413121110 9 8 8 7 6 5 MAIN PWB VERSION MAIN PWB-A 1 2 3 4 5 6 7 1 2 3 4 100P (CH) R720 R712 6.8K 6.8K R719 R711 6.8K 6.8K 8 7 6 5 4 3 2 1...

  • Page 32: Wiring Side Of P.w.board

    MD-MT180 MAIN PWB VERSION B X0021AWZZ SUB PWB-B is added to this version PWB. SUB PWB-B is shown in page 36,37. J703A J701 HEADPHONES OPTICAL/LINE-IN SW403 TP705 LID OPEN TP701 TP711 TP703 TP727 TP704 J801 TP801 TP723 DC-IN TP726 TP725...
  • Page 33 MD-MT180 MAIN PWB VERSION B X0021AWZZ SUB PWB-B is added to this version PWB. SUB PWB-B is shown in page 36,37. J703A J701 HEADHONES OPTICAL/LINE-IN SW403 LID OPEN R257 R808 R810 C703 C701 J801 DC-IN C702 R806 L452 R715 R716...
  • Page 34 MD-MT180 MAIN PWB VERSION C X0021AWZZ SUB PWB-B is added to this version PWB. SUB PWB-B is shown in page 36,37. J703A J701 HEADPHONES OPTICAL/LINE-IN SW403 TP705 LID OPEN TP701 TP711 TP703 TP727 TP704 J801 TP801 TP723 DC-IN TP725 TP722...
  • Page 35 MD-MT180 MAIN PWB VERSION C X0021AWZZ SUB PWB-B is added to this version PWB. SUB PWB-B is shown in page 36,37. J703A J701 HEADHONES OPTICAL/LINE-IN SW403 LID OPEN R257 R808 R810 C703 C701 J801 DC-IN C702 R806 L452 R715 R716...
  • Page 36 MD-MT180 MAIN PWB VE SUB PWB-B is added to SW403 LID OPEN TP726 IC703 TP665 IC703 CK202 CK205 IC501 IC401 CK809 SW401 EJECT IC255 CK102 IC101 IC251 TP201A MAIN PWB-A (TOP VIEW) X0021AWZZ B :P33 X0021AWZZ C :P35 Figure 36 WIRING SIDE OF P.W.BOARD (5/11)
  • Page 37 MD-MT180 SUB PWB-B CK13A CK13 CK14 MAIN PWB VERSION B , C SUB PWB-B is added to this version PWB. CK16 TP705 TP701 TP711 TP703 TP727 TP704 TP801 TP723 TP725 TP726 TP722 TP712 TP706 TP702 TP724 TP665 TP708 TP802 TP714...
  • Page 38 MD-MT180 MAIN PWB VERSION X X0035AWZZ J701 J703A HEADPHONES OPTICAL/LINE-IN SW403 TP705 LID OPEN TP701 TP711 TP703 TP727 TP704 J801 TP801 TP723 DC-IN TP725 TP722 TP726 TP712 TP702 TP724 TP706 TP665 SW601 TP708 DISC PROTECT TP802 TP714 TP707 TP713 TP729...
  • Page 39 MD-MT180 MAIN PWB VERSION X X0035AWZZ J703A J701 HEADHONES OPTICAL/LINE-IN SW403 LID OPEN R257 R810 R808 C703 C701 J801 DC-IN C702 R806 L452 R715 R716 Q891 R703 Q711 BATTERY TERMINAL (227) L800 (–) C454 L454 D801 R815 IC701 R404 R717...
  • Page 40 MD-MT180 MAIN PWB VERSION D X0021AWZZ J701 J703A HEADPHONES OPTICAL/LINE-IN SW403 TP705 LID OPEN TP701 TP711 TP703 TP727 TP704 J801 TP801 TP723 DC-IN TP725 TP722 TP726 TP712 TP702 TP724 TP706 TP665 SW601 TP708 DISC PROTECT TP802 TP714 TP707 TP713 TP729...
  • Page 41 MD-MT180 MAIN PWB VERSION D X0021AWZZ J703A J701 HEADHONES OPTICAL/LINE-IN SW403 LID OPEN R257 R810 R808 C703 C701 J801 DC-IN C702 R806 L452 R715 R716 Q891 R703 Q711 BATTERY TERMINAL (227) L800 (–) C454 L454 D801 R815 IC701 R404 R717...
  • Page 42 MD-MT180 TO MAIN PWB P33,P35,P39,P41 8-C,D CN601 M902 MAGNETIC HEAD (20) SLED MOTOR TO MAIN PWB P33,P35,P39,P41 9-C,D MECHANISM CN451 FLEXIBLE PWB (19) M901 SPINDLE MOTOR M903 LIFT MOTOR KEY SWITCH FLEXIBLE PWB (228) OPTICAL PICKUP (1) LCD UNIT (229)

  • Page 43: Voltage

    MD-MT180 VOLTAGE IC101 IC201 IC401 IC701 IC601 IC809 VOLTAGE PIN VOLTAGE PIN VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE 0.27V 1.3V 0.79V 2.52V 0.9V 0.27V 2.52V 2.61V 2.52V 0.27V 2.52V 2.52V 1.31V 0.72V 4.53V 0.27V 2.5V 2.52V 4.56V 2.6V 1.31V 2.61V 1.31V...

  • Page 44: Waveforms Of Md Circuit

    MD-MT180 WAVEFORMS OF MD CIRCUIT Stopped Stopped 1994 / 12 / 16 00:24:17 Stopped 1994 / 12 / 15 22:54:19 1994 / 12 / 16 01:03:40 CH1=1mV CH2=500mV CH3=5V CH4=2V CH1=2V CH2=2V CH3=2V CH4=2V 50us/div CH1=1V CH2=2V CH3=500mV 50ms/div 2ms/div...

  • Page 45: Troubleshooting

    MD-MT180 TROUBLESHOOTING 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 46 MD-MT180 • Audio playback circuit Although the playback time display is acting., no sound is given during playback in the normal mode. Is audio waveform output from IC501 pins 15 and 16? Check IC201 pins 70 to 72, pin 74 and IC501 pins 9, 10, 11, 12.
  • Page 47 MD-MT180 • 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 48: Function Table Of Ic

    MD-MT180 FUNCTION TABLE OF IC IC401 RH-iX0484AWZZ :System Microcomputer (IX0484AW) (1/2) Main PWB Version B,C,X IC401 RH-iX0529AWZZ :System Microcomputer (IX0529AW) (1/2) Main PWB Version D Pin No. Port Name Terminal Name Input/Output Function Output Track cross signal/focus drive detection SPIN...
  • Page 49 MD-MT180 IC401 RH-iX0484AWZZ :System Microcomputer (IX0484AW) (2/2) Main PWB Version B,C,X IC401 RH-iX0529AWZZ :System Microcomputer (IX0529AW) (2/2) Main PWB Version D Pin No. Port Name Terminal Name Input/Output Function Input Operation mode selection input 1 DCEXT Input/Output DC-IN detection (level)
  • Page 50 MD-MT180 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.
  • Page 51 MD-MT180 IC601 VHiLV8201W+-1 :PWM Driver (LV8201W)(1/2) Pin No. Terminal Name Function Spindle motor COM point connection terminal. IN1F H bridge 1 logic input terminal. Output from pins 9 and 7. IN1R IN2F H bridge 2 logic input terminal. Output from pins 12 and 14.
  • Page 52 MD-MT180 IC601 VHiLV8201W+-1 :PWM Driver (LV8201W)(2/2) Pin No. Terminal Name Function VCC2 Terminal for supplying power to MOS circuit. Used by connecting to VCC1 terminal (pin 20). Half bridge logic input terminal. Output from pin 36. Logic input terminal in 3-phase thread section. Output from pins 42, 40, and 38.
  • Page 53 MD-MT180 IC202 RH-iX2824AFZZ: 16M Bit D-RAM (IX2824AF) Function Terminal Name Pin No. Power supply (2.6V) I/O1 Data input/data output I/O2 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)
  • Page 54 MD-MT180 — M E M O — – 54 –...
  • Page 55 “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 56 MD-MT180 PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PART CODE RANK RANK INTEGRATED CIRCUITS COILS VHIVHC164FT-1 CMOS LOGIC,VHC164FT L100 VPBNN100K0000 AC 10 H [Main PWB Version B,C,X] L101 RCILC0353AFZZ AB Tip Solid Induction,100mA VHITC7W74FK-1 CMOS LOGIC,TC7W74FK L171 RCILC0356AFZZ AC 10 H...
  • Page 57 MD-MT180 PRICE PRICE DESCRIPTION PART CODE PARTS CODE DESCRIPTION RANK RANK C615 VCKYCY0JB105K AC 1 F,6.3V R262 VRS-CY1JB124F AA 120 kohms,1/16W C617~619 VCKYCZ1EB472K AB 0.0047 F,25V R266 VRS-CY1JB473F AA 47 kohms,1/16W C620 VCKYCY1HB682K AA 0.0068 F,50V R267 VRS-CY1JB103F AA 10 kohm,1/16W...
  • Page 58 MD-MT180 PRICE PRICE DESCRIPTION PART CODE PARTS CODE DESCRIPTION RANK RANK R819 VRS-CY1JB223J AA 22 kohms,1/16W MLEVP0120AWZZ J AC Lever,Detect R831,832 VRS-CY1JB184F AA 180 kohms,1/16W MSPRD0174AWFJ J AB Spring,Detect Lever R844 VRS-CY1JB470J AA 47 ohms,1/16W MSPRT0068AWFJ J AB Spring,Eject Lever...
  • Page 59 MD-MT180 502x2 505x3 M901 501x2 M903 M902 Figure 4 MD MECHANISM EXPLODED VIEW – 4 –...
  • Page 60 MD-MT180 MECHANISM 603x2 226x2 PWB-A 606x2 Figure 5 CABINET EXPLODED VIEW – 5 –...
  • Page 61 MD-MT180 PACKING OF THE SET (FOR U.S.A. ONLY) Pad,Operation Manual SPAKZ0490AWZZ Earphones Connecting Cord, RCA Type Quick Guide Battery Case Operation Manual AC Adaptor Battery Carring Case Bag,Polyethylene SSAKH0033AWZZ Rechargeable Battery Label,SER.No.,Set TLABN0092AWZZ Pad,Unit SPAKA0336AWZZ Packing Case SPAKC1341AWZZ Label,Bar Code TLABR1254AWZZ Label,SER.No.,Packing Case...
  • Page 62 MD-MT180 –MEMO–...
  • Page 63 MD-MT180 –MEMO–...
  • Page 64 MD-MT180 © COPYRIGHT 2002 BY SHARP CORPORATION 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.

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