Sharp MD-MT821(GL), Service Manual

Page 1: ... 30 WAVEFORMS OF MD CIRCUIT 37 TROUBLE SHOOTING 38 FUNCTION TABLE OF IC 41 PARTS GUIDE EXPLODED VIEW PACKING OF THE SET MD MT821 ONLY SERVICE MANUAL SHARP CORPORATION No S4913MDMT821 This document has been published to be used for after sales service only The contents are subject to change without notice In the interests of user safety the set should be restored to its original condition and only ...

Page 2: ...e 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 Do not look into the Pickup Lens 2 The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior to shipping 3 No adjustment to t...

Page 3: ...t socket Line optical digital microphone powered by the main unit Output socket Headphones impedance 19 ohms MT821 remote control unit Output socket Earphones impedance 32 ohms MT821W remote control unit MiniDisc Recorder Type Portable MiniDisc recorder Signal readout Non contact 3 beam semi conductor laser pick up Audio channels Stereo 2 channels monaural long play mode 1 channel Frequency respon...

Page 4: ...Recording Time Indicator 15 Total Track Number Indicator 16 Record Track Mark Button 17 Mode Button 18 Bass Delete Button 19 Enter Fast Play Synchro Button 20 Volume Cursor Up Button 21 Volume Cursor Down Button 22 Edit Auto Mark Time Mark Button 23 Display Character Select Button 24 Fast Reverse Fast Forward Record ing Level Control Name Select Shuttle Switch 25 Stop Power Off Button OFF 26 Play ...

Page 5: ...charged the whole battery indicator will flash Re charge the battery or replace the alkaline battery with a new one When the battery has run completely out BATT EMPTY main unit and Lo BATT remote control unit will appear Then the power will be disconnected automatically Notes When using the unit with an alkaline bat tery or a rechargeable battery the battery indicator will not correctly display th...

Page 6: ... When the unit is moved from a cool place to a warm place When the unit has condensation inside the disc signals cannot be read and the unit may not function properly If this happens remove the disc The condensation should evaporate in approximately 1 hour The unit will then function properly When the number of tracks used reaches the limit regardless of the remaining recording time further record...

Page 7: ...g the analog cable Change the stop position of the track and then try editing it Re record or replace it with another recordable disc Check the number of tracks If the sound you hear is not right try recording again Replace the disc with another recordable disc Connect the digital cable securely Replace it with another recordable disc Return the HOLD switch to its original position Turn off the po...

Page 8: ...f it only has an alkaline battery in it Back of the MD recorder Parte posterior de la grabadora de MD AC power Alimentación de CA Open Abrir Press Pulsar AC 120V 60Hz 120V CA 60Hz 1 2 O P E N O P E N O P E N O P E N O P E N 3 Printed in Japan Impreso en Japón Asegúrese de que se ha insertado una batería completamente cargada No emplee el aparato si sólo tiene una pila alcalina instalada Mark Marca...

Page 9: ...cally and playback will start from the first track Auto play function La alimentación se conectará automáticamente y la reproducción empezará desde la primera pista Función de reproducción automática Load a MiniDisc in the direction indicated by the arrow on the MiniDisc with the label side facing up To interrupt playback Para interrumpir la reproducción Press the 06 button during playback To resu...

Page 10: ... 3 Caution Carefully handle the main PWB and flexible PWB After removing the flexible PWB 1 for the optical pickup from the connector do not touch directly the front end of flexible PWB with your hand so as to prevent damage of optical pickup by static electricity Figure 10 4 B1 x2 ø1 4x2mm B1 x2 ø1 4x2mm A1 x2 ø1 4x2mm A1 x2 ø1 4x2mm A1 x1 ø1 4x2mm Bottom Lid OPEN Lever Top Cabinet Center Cabinet...

Page 11: ... solder joint B1 x 2 of lift motor lead wire 2 Remove the screw B2 x 1 pc and remove the flexible PWB 3 Remove the screw B3 x 1 pc and remove the lift motor Note Take care so that the motor gear is not damaged If the gear is damaged noise is caused How to remove the sled motor See Fig 11 3 1 Remove the stop washer C1 x 1 pc and remove the drive gear C2 x 1 pc 2 Remove the screws C3 x 2 pcs and rem...

Page 12: ...st 3 TEST PLAY Mode Continuous playback from the specified address is performed 1 line 10 lines or 384 lines manual jump is performed C1 error rate display pit section ADIP error rate display groove section The temperature correction is performed only when servo start is performed but the posture correction is not performed during continuous playback 4 TEST REC Mode Continuous record from the spec...

Page 13: ...ment value and set value of adjustment items for AUTO1 and MANUAL 1 are displayed If the VOL UP button is pressed during setting indication the setting increases If the VOL DOWN button is pressed the setting reduces And then the new setting is stored in the RAM When the VOL UP DOWN button is held down the setting changes continuously one cycle being 100 ms In this operation the setting change is p...

Page 14: ...held down the setting changes continuously one cycle being 100 ms When the VOL UP DOWN button is pressed in the TEST REC mode or continuous record mode the laser record power changes Servo gain changes also according to record power After the laser record power is indicated for one second the address indication is restored R P W _ Address Laser power cord Operation is disabled if the premastered d...

Page 15: ...ate TM is displayed Temperature code Temperature reference 3 Once press SKIP UP and determine the displayed microcomputer TEMP input AD value TPin is displayed TEMP input AD value 4 At the ambient temperature determine the temperature corrected value from the temperature measurement value correction table 5 Determine the temperature reference using the following formula Temperature reference Micro...

Page 16: ... 1 _ 1 1 H C T 2 _ 4 0 H C T 3 _ 3 0 H R C 0 _ C 0 H R C 1 _ F E H S Y C _ A 6 H P W C _ 1 2 H P W L _ 2 6 H D R 1 _ 0 9 H D R 2 _ 8 5 H I N 1 _ 5 4 H I N 2 _ 9 D H I N H _ 6 4 H D R H _ 7 4 H P L E _ 9 6 H R C E _ 9 4 H E L T _ 7 0 H S L T _ 4 4 H S P M _ 0 0 H M S L _ 0 0 H U S 0 _ 0 0 H U S 1 _ 0 0 H U S 2 _ 0 0 H Item display Set values F G _ _ 6 3 H F F 1 _ 7 0 H F F 2 _ E 8 H F Z H _ E D H F...

Page 17: ... A N U 1 ATT manual adjustment menu M A N U 2 Error history display menu E D A T A Test mode normal playback menu N O R M A L Preautomatic Adjustment menu Preadjustment error adjustment value output During preadjustment adjustment Adjustment error Normal end Preadjustment normal end adjustment value output During ATT automatic adjustment PLAY PLAY A U T O 1 Preautomatic Adjustment A D J O K A D J ...

Page 18: ...tative measurement Measurement value E signal offset EINO tentative measurement Measurement value F signal offset FINO tentative measurement Measurement value Laser ON Play Power RF side focus gain coarse adjustment Gain setting A ATT focus tentative setting ATT setting B ATT focus tentative setting ATT setting RF side pit section tracking gain adjustment Gain setting Pit section adjustment COUT l...

Page 19: ...H SKIP UP SKIP DOWN E H SKIP UP SKIP DOWN F H SKIP UP SKIP DOWN T H SKIP UP SKIP DOWN A L SKIP UP SKIP DOWN B L SKIP UP SKIP DOWN E L SKIP UP SKIP DOWN F L SKIP UP SKIP DOWN ATT manual adjustment menu Temperature code display Temperature code Laser ON Play Power Pit section E ATT tracking setting ATT setting Pit section F ATT tracking setting ATT setting High reflection A ATT focus setting Low ref...

Page 20: ... SKIP UP SKIP DOWN A L SKIP UP SKIP DOWN B L SKIP UP SKIP DOWN E L SKIP UP SKIP DOWN F L SKIP UP SKIP DOWN T H SKIP UP SKIP DOWN P T G SKIP UP SKIP DOWN G T G SKIP UP SKIP DOWN R C G SKIP UP SKIP DOWN R F G SKIP UP SKIP DOWN P C H SKIP UP SKIP DOWN G C H SKIP UP SKIP DOWN S A SKIP UP SKIP DOWN Continued to the next SKIP UP SKIP DOWN B ATT focus initial setting E ATT tracking initial setting F ATT ...

Page 21: ... continued playback mode jump of specified number of lines occurs in the external periphery direction If the key is held down jump occurs continuously 100 ms cycle When the SKIP DOWN button is pressed in the continuous playback mode jump of specified number of lines occurs in the internal periphery direction If the key is held down jump occurs continuously 100 ms cycle 0 9 5 0 H Continuous record ...

Page 22: ...lay TIME min TIME sec U 2 When the STOP button is pressed in specific menu the TEST MODE STOP state is set Error history display menu Error history 0 display Error code Error history 1 display Error code Error history 2 display Error code Error history 3 display Error code Error history 4 display Error code Error history 5 display Error code Error history 6 display Error code Error history 7 displ...

Page 23: ... menu the TEST MODE STOP state is set When the DISP button operation is performed in the specific state the menu changes to TEMP SETTING menu In the specific state the setting changes in the range of 00h to FFh when the VOL UP DOWN button is pressed The upper limit varies depending on the items When the MODE button is pressed in each state the set digit is changed Focus setting menu PLAY F o c u s...

Page 24: ...ding on the items T G R SKIP UP SKIP DOWN S C t SKIP UP SKIP DOWN S C m SKIP UP SKIP DOWN C L p SKIP UP SKIP DOWN C L r SKIP UP SKIP DOWN J P I SKIP UP SKIP DOWN K 1 0 SKIP UP SKIP DOWN Spin setting menu PLAY S p i n Spin Setting S P G S P i SKIP UP SKIP DOWN S P m SKIP UP SKIP DOWN S P o SKIP UP SKIP DOWN S P 1 SKIP UP SKIP DOWN S P 2 SKIP UP SKIP DOWN S P 3 SKIP UP SKIP DOWN S P 4 SKIP UP SKIP D...

Page 25: ...IP UP SKIP DOWN When the STOP button is pressed in specific menu the TEST MODE STOP state is set When the DISP button operation is performed in the specific state the menu changes to TEMP SETTING menu In the specific state the setting changes in the range of 00h to FFh when the VOL UP DOWN button is pressed When the MODE button is pressed in each state the set digit is changed Adjustment setting m...

Page 26: ... specific setting display state the setting change digit changes when the P MODE button is pressed 1st digit initial value 2nd digit P MODE P MODE In the specific state the setting changes in the range of 0h to Fh when the VOL UP DOWN button is pressed When the MODE button is pressed in each state the set digit is changed Control setting menu PLAY C T R L Control Setting C T 0 C T 1 SKIP UP SKIP D...

Page 27: ...P button is pressed in specific menu the TEST MODE STOP state is set When the DISP button operation is performed in the specific state the menu changes to TEMP SETTING menu In the specific setting display state the setting change digit changes when the P MODE button is pressed 1st digit initial value 2nd digit P MODE P MODE In the specific state the setting changes in the range of 0h to Fh when th...

Page 28: ... a symbol is microfarad As to electro lytic capacitor the expression capacitance withstand volt age is used CH TH RH UJ Temperature compensation ML Mylar type The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chas sis with no signal given Parts marked with are important for maintaining the safety of the set Be sure to replace these parts...

Page 29: ...DC JACK 4 5 5V 2 9 4 1V 3 4V VCC 2 35V DISPLAY UNIT OPERATION UNIT IC901 3 PHASE BRUSH LEESS DRIVER BA6966FV IC703 AUDIO AMP IR3R54N IC701 AUDIO AMP IR3R54N IC601 PWM DRIVER 17A39TD VM VCC EEPROM 4 5V VCC VS IC202 16BIT D RAM 2 5 4 5V OPTICAL IN UNIT OPTICAL IN J701 LINE IN J702 MIC IN READY FOR PLUG IN POWER SERIES REGULATOR 1 6 19 20 17 16 13 24 26 29 31 6 8 5 9 10 14 23 27 28 32 13 14 24 42 40 ...

Page 30: ... 20 19 18 17 16 15 14 13 R106 56K CK108 CK107 TP133 TP132 TP131 TP130 C112 0 033 C111 0 0033 CK112 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 C203 0 1 R204 1K C205 0 1 C100 10 6 3 R907 180K R908 100K C902 0 01 R909 10K L651 56 IC651 LB1930M MOTOR DRIVER 10 9 8 7 6 5 4 3 2 1 L600 2 2µH C600 22 6 3 TP610 C605 0 1 C604 1 R408 100K SW402 HOLD SW403 DISC IN 3 2 1 4 TP441 C911 0 1 NC NC NC...

Page 31: ...2µH N R825 10M R824 270K C822 10P CH D851 1SS389 R857 100K C854 0 01 L851 4 7µH IC851 NDS331N POWER DRIVE C856 1 D852 U1FWJ44N L852 10µH R855 300K C857 10 C853 47P CH R853 300K 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 L862 100µH C203 0 1 R204 1K C205 0 1 C100 10 6 3 R502 470 R501 470 C502 0 0022 C501 0 0022 C511 1 L500 22µH TP500 D861 F10J2E C861 1 L600 2 2µH C600 22 6 3 TP61...

Page 32: ...1 C715 0 1 TP703 TP705 TP708 TP701 TP709 TP704 TP702 TP707 R715 100K R716 100K J701 OPTICAL LINE IN 9 8 7 6 5 4 3 2 1 R725 100 C725 3 3 10 R482 33K R481 33K R713 10K R765 R766 R717 1K C703 0 01 R702 22 R729 2 7K R730 2 7K C721 3 3 10 C722 3 3 10 C738 R728 1K C731 0 22 R727 8 2K C723 0 001 R723 6 8K R724 6 8K C724 0 001 C752 0 082 C751 0 082 4 1 J801 DC JACK 3 2 1 C206 1 IC203 62FP2002 2V REGULATOR...

Page 33: ...2 4 5 6 7 8 3 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 3 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 3 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 3 1 2 4 5 6 3 0 88V 2 5V 1 27V 0V 1 25V 1 25V 1 26V 1 25V 1 26V 1 3V 1 58V 2V 0V 0V 0V 0V 1V 0V 0V 0V 0V 0V 0V 0V 0V 0 49V 1 44V 1 13V 2 56...

Page 34: ...37 IC202 R154 C161 C508 R500 C507 C200 XL401 IC200 R351 C357 C354 C353 R905 R920 IC353 L608 L609 L610 C622 C608 C610 1 1 1 5 10 15 20 25 26 30 35 40 45 50 51 55 60 65 70 75 76 80 85 90 95 100 1 4 4 5 5 8 8 5 10 7 8 14 C609 IC351 IC601 C651 C203 L651 1 5 10 15 25 20 30 35 36 18 19 R601 R207 IC501 C506 C505 C501 C502 1 1 6 7 12 13 18 19 24 5 10 15 20 24 12 13 R501 R502 R717 Q711 C211 C212 R222 C511 ...

Page 35: ...3 4 5 22 1 8 7 2 3 4 5 6 1 16 1 22 To Optical Pickup Unit P36 1 D J703 Remote Control Head phones 1 16 To Mechanism Flexible PWB Ass y P36 6 C 1 7 1 13 To Key Switch Flexible Ass y P36 2 E 1 7 To LCD Ass y P36 5 E 3 2 1 J801 DC Jack Terminal Battery 213 Terminal Battery 212 J702 MIC IN MAIN PWB A TOP VIEW Extension battery Terminal 217 4 3 2 1 6 9 8 3 1 5 4 2 7 2 3 4 1 3 1 4 5 L711 L712 L713 L704 ...

Page 36: ...d Flexible PWB 23 Magnetic Head 30 Mechanism Flexible PWB Ass y 8 M902 Sled Motor M903 Lift Motor PH901 Phote Interrupter M901 Spindle Motor SW902 Disc Protect To Main PWB CN601 To MAIN PWB P35 10 A CN482 LCD Ass y 219 Key Switch Flexible PWB Ass y 218 To MAIN PWB P35 9 A CN451 CN101 To MAIN PWB P35 7 H P35 10 H ...

Page 37: ...1 0 000V CH2 0 00V Main 1K Zoom 1K CH3 0 00V CH4 0 00V Trigger Mode AUTO Type EDGE CH1 Detay 0 0ns Hold OFF MINIMUM T TP201 EFM Stopped CH1 2V DC 10 1 500ms div 500ms div 1 MORM 200MS s 9 1994 12 15 08 57 26 Filter Offset Record Length Smoothiing OFF BW FULL CH1 0 00V CH2 0 00V Main 10K Zoom 10K CH3 0 000V CH4 0 0V Trigger Mode NORMAL Type EDGE CH1 Detay 0 0ns Hold OFF MINIMUM T TP201 EFM TP210 TE...

Page 38: ...Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol Do not touch the lens with the bare hand Is the power supply turned on when the remote control button or main unit button is pressed No Perform the check stated in item Power is not turned on when the PLAY button is pressed Perform the check stated in item Abnormal display No Yes Does the display operate norm...

Page 39: ...e display advance Yes Position check in INNER mode Check IC201 and IC202 connection line Is the lead in photointerrupter set to OFF when the optical pickup moves to the innermost periphery in NORMAL mode Is TP660 in H level Check the lead in photointerrupter mechanical flex PWB soldering and CN601 connection No Ia an attempt to repeat repeatedly the TOC part performed on the low reflection disc Ye...

Page 40: ...Check whether disc is record inhibited No Does the RF waveform of TP201 appear when playback is Does level of pins 86 of IC401 and pin 17 of IC101 change depending on record and playback Is RF pattern output from IC201 pin 50 Yes No Check for soldering failure of IC201 No Check periphery of IC401 and IC101 Check whether there is any damage in IC101 periphery of laser diode Yes Check for defects of...

Page 41: ...ion detection input 34 PC2 _INPGI Input Line digital plug insertion detection 35 PC3 INPGCK Input Line digital plug type detection 36 PC4 RCPCNT Input Output Record circuit power control output 37 PC5 TEST1 Input Test mode setting input 1 38 PC6 TEST0 Input Test mode setting input 0 39 PC7 JPNP Input Kana conversion Kana input existence nonexistence discrimination 40 Vcc VCC Positive power supply ...

Page 42: ...DRY Input Dry battery voltage detection input 80 AN1 PLVDCI Input DC jack voltage detection input 81 AN2 PLVINN Input Lithium battery voltage detection input 82 AN3 RKEY Input Remote control key operation detection input 83 AN4 HKEY1 Input Unit key operation detection input 1 84 AN5 HKEY2 Input Unit key operation detection input 2 85 AN6 TEMP Input Ambient temperature detection input 86 DA1 LDVAR ...

Page 43: ... Cylindrical type without lead wire VC MN Cylindrical type without lead wire VC TV Square type without lead wire VC TQ Square type without lead wire VC CY Square type without lead wire VC CZ Square type without lead wire VC J The 13th character represents capacity difference J 5 K 10 M 20 N 30 C 0 25 pF D 0 5 pF Z 80 20 If there are no indications for the electrolytic capacitors error is 20 Resist...

Page 44: ...V C753 754 VCKYTV1CF105Z J AB 1 µF 16V C755 VCKYCY1EB103K J AA 0 01 µF 25V C756 757 VCKYTV1AB684K J AC 0 68 µF 10V C758 VCSATA1AJ335M J AB 3 3 µF 10V Electrolytic Tantalum C759 760 VCKYCY1CB273K J AA 0 027 µF 16V C761 762 VCKYTV1CF225Z J AC 2 2 µF 16V INTEGRATED CIRCUITS IC101 VHIIR3R55 1 J AQ RF Signal Processor IR3R55 IC200 VHI62FP2502 1 J AE Power Drive 62FP2002 IC201 VHILR37811 1 J BB ENDEC LS...

Page 45: ...W R481 482 VRN CY1JD333D J AA 33 kohms 1 16W 1 Metal Film R492 VRS CY1JB102J J AA 1 kohm 1 16W R500 VRS CY1JB4R7J J AA 4 7 ohms 1 16W R501 502 VRS CY1JB471J J AA 470 ohms 1 16W R601 VRS CY1JB563J J AA 56 kohms 1 16W R701 702 VRS CY1JB220J J AA 22 ohms 1 16W R703 VRS CY1JB104J J AA 100 kohm 1 16W R711 712 VRS CY1JB562J J AA 5 6 kohms 1 16W R713 714 VRS CY1JB103J J AA 10 kohm 1 16W R715 716 VRS CY1J...

Page 46: ... BL for Taiwan TGANZ1096AF06 J Warranty Card MT821W GL for Taiwan 3 J703 QJAKM0205AFZZ J AH Jack Remote Control Head phones J801 QJAKC0142AFZZ J AE Jack DC M901 RMOTV0524AFZZ J AS Motor Ass y Spindle M902 RMOTV0511AFZZ J AT Motor Ass y Sled M903 RMOTV0512AFM1 J AR Motor Ass y Lift SW401 QSW M0001AWZZ J AD Switch Push Type EJECT SW402 QSW S0948AFZZ J AC Switch Slide Type HOLD SW403 QSW M0172AFZZ J ...

Page 47: ...Bar Code MT821W BL for Central South America Brasil TLABS0478AFZZ J AC Label CPA MT821W TLABZ2560AFZZ J Label Import Company MT821W BL for Taiwan TLABZ2561AFZZ J Label Import Company MT821W GL for Taiwan TLSTS0126AFZZ J Service Station MT821W for Taiwan TLSTS0127AFZZ J Service Station MT821W for Philippines UBAGC0083AFSA J AH Carrying Case UBATI0088AFSA J BD Rechargeable Battery UBNDT0086AFSA J AF...

Page 48: ... G H 1 2 3 4 5 6 Figure 5 MD MECHANISM EXPLODED VIEW 5 M903 M902 M901 503x2 502x3 509x2 501x2 11 505 30 23 510 513 8 2 SW902 8 1 8 8 3 PH901 508 503 508 9 25 17 1 2 16 18 15 512 511 27 504 13 503 5 3 10 29 20 4 28 26 6 7 506 ...

Page 49: ...201 223 229 226 227 228 232 219 218 233 601 604 603x2 603x2 215 210x2 202 206 205 217 208 204 204 4 204 2 204 1 204 3 603x2 603 235 236 203 MD MECHANISM 241 242 231 230 238x2 234 240 603x2 211 216 207 212 214 209 239 213 PWB A 602 222 221 244 246 For MT821W Only For MT821W Only ...

Page 50: ...EL Battery Case Connecting Cord RCA Type AC Adaptor Headphones Remote Control Packing Add SPAKA2704AFZZ Packing Case SPAKC6785AFZZ Pad AC Adaptor SPAKZ0489AFZZ Rechargeable Battery Strap Connecting Cord Optical Type Operation Manual Quick Guide Caution Headphones Not Replacement Item Carrying Case Lid Battery Attention Card ...

Page 51: ...MD MT821 W M E M O 8 ...

Page 52: ...rieval system or transmitted in any from or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher A9904 1565NS HA M SHARP CORPORATION Communication Systems Group Quality Reliability Control Center Higashihiroshima Hiroshima 739 0192 Japan Printed in Japan SC EX ...