Sony MDS-PC2 Service Manual
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Sony MDS-PC2 Service Manual

Sony MDS-PC2 Service Manual

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SERVICE MANUAL
MICROFILM
MDS-PC2
Model Name Using Similar Mechanism
MD Mechanism Type
Optical Pick-up Type
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
MDS-S40
MDM-5A
KMS-260B/J1N
— Continued on next page —
MINIDISC DECK
1

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Summary of Contents for Sony MDS-PC2

  • Page 1 MDS-PC2 SERVICE MANUAL US Model Canadian Model AEP Model UK Model E Model Model Name Using Similar Mechanism MDS-S40 MD Mechanism Type MDM-5A Optical Pick-up Type KMS-260B/J1N SPECIFICATIONS — Continued on next page — MINIDISC DECK MICROFILM...
  • Page 2 SELF-DIAGNOSIS FUNCTION The self-diagnosis function consists of error codes for customers which are displayed automatically when errors occur, and error codes which show the error history in the test mode during servicing. For details on how to view error codes for the customer, refer to the following box in the instruction manual.
  • Page 3 ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS Selecting the Test Mode Display Details of History Displays the recording time. total rec Displayed as “rππππππh”. The displayed time is the total time the laser is set to the high power state. This is about 1/4 of the actual recording time.
  • Page 4 LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES 4-220-579-0π Singapore model PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

  • Page 5: Table Of Contents

    SAFETY CHECK-OUT TABLE OF CONTENTS After correcting the original service problem, perform the follow- 1. SERVICING NOTE ............6 ing safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, 2. GENERAL ................

  • Page 6: Servicing Note

    SECTION 1 SERVICING NOTE JIG FOR CHECKING BD BOARD WAVEFORM The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be performed are shown as follows. GND : Ground I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser) IOP : For measuring IOP (Check the deterioration of the optical pick-up laser) TEO : TRK error signal (Traverse adjustment)
  • Page 7 IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC171 OF BD BOARD) ARE REPLACED The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look at the value on the label of the optical pick-up.
  • Page 8 CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent. Details of the procedures are described in “5 Electrical Adjustments”. Criteria for Determination Measure if unsatisfactory: (Unsatisfactory if specified value is not satisfied) Laser power check •...
  • Page 9 FORCED RESET The system microprocessor can be reset in the following procedure. Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc. The line output level and PHONES output level can be varied in the range from 0 dB to -40 dB using the remote commander of this unit. When forced reset is executed, these levels will be set to the initial value of -20 dB.
  • Page 10 RETRY CAUSE DISPLAY MODE • In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the “track mode” for obtaining track information will be set. This is useful for locating the faulty part of the unit. •...
  • Page 11 Reading the Track Mode Display Higher Bits Lower Bits Details Hexa- Hexadecimal decimal b7 b6 b5 b4 b3 b2 b1 b0 When 0 When 1 Binary Emphasis ON Emphasis OFF Stereo Monaural This is 2-bit display. Normally 01. 01:Normal audio. Others:Invalid Invalid Audio (Normal) Digital copy...

  • Page 12: General

    SECTION 2 This section is extracted from instruction manual. GENERAL Front Panel Location of Parts and Controls...

  • Page 13: Disassembly

    SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. 3-1. CASE AND FRONT PANEL 2 Two screws (Flat head) 1 Two screws (Flat head) 3 Case 7 Screw Claw (M2 x 6.0) 5 Screw (BTT M3) Claw 8 Front panel (Take not of two claws)

  • Page 14: Slider (Cam)

    3-3. SLIDER (CAM) 6 Slider (Cam) • Note for Installation of Slider (Cam) Set the shaft of Cam gear to be at the position in the figure. 2 Bracket (Guide L) 1 Two screws (BTP 2.6 x 6) Set the shaft of Lever (O/C) to 3 Leaf spring be at the position in the figure.

  • Page 15: Sw Board And Loading Motor (M103)

    3-5. SW BOARD AND LOADING MOTOR (M103) 1 Screw (PTPWH M2.6 x 6) 2 Gear B 3 Two screws (PWH 1.7 x 3) 4 Loading motor (M103) 6 SW board 5 Three screws (BTP2.6 x 6)

  • Page 16: Test Mode

    SECTION 4 TEST MODE *Note: As this unit has only a few buttons, one button is assigned with several functions in the test mode.” Press the INPUT button to switch the functions. Each time the INPUT button is pressed, the display switches in the following order;” “PROGRAM”...

  • Page 17: Electrical Adjustments

    4-5. SELECTING THE TEST MODE There are 27 types of test modes as shown below. The groups can be switched by pressing the = and = buttons. After selecting the group to be used, press the ^ “PROGRAM” button. After setting a certain group, pressing the = and = buttons switches between these modes.
  • Page 18 4-5-1. Operating the Continuous Playback Mode 1. Entering the continuous playback mode 1 Set the disc in the unit. (Whichever recordable discs or discs for playback only are available.) 2 Press the + button and display “CPLAY MODE”. 3 Press the ^ “PROGRAM” button to change the display to “CPLAY MID”. 4 When access completes, the display changes to “C1 = AD = ”.
  • Page 19 4-6. FUNCTIONS OF OTHER BUTTONS Contents Function Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo turns ON/OFF. Stops continuous playback and continuous recording. “PROGRAM” The sled moves to the outer circumference only when this is pressed. “PROGRAM”...
  • Page 20 MEANINGS OF OTHER DISPLAYS Contents Display When Lit When Off During continuous playback (CLV: ON) STOP (CLV: OFF) Tracking servo OFF Tracking servo ON Recording mode ON Recording mode OFF CLV low speed mode CLV normal mode SYNC ABCD adjustment completed L.SYNC Tracking offset cancel ON OVER...

  • Page 21: Electrical Adjustments

    SECTION 5 ELECTRICAL ADJUSTMENTS 5-1. PARTS REPLACEMENT AND ADJUSTMENT • Check and adjust the MDM and MBU as follows. The procedure changes according to the part replaced • Abbreviation : Optical pick-up OWH: Overwrite head • Temperature compensation offset check •...
  • Page 22 5-2. PRECAUTIONS FOR CHECKING LASER DIODE 4) Use the following tools and measuring devices. • Check Disc (MD) TDYS-1 EMISSINON (Parts No. 4-963-646-01) To check the emission of the laser diode during adjustments, never • Test Disk (MDW-74/AU-1) (Parts No. 8-892-341-41) view directly from the top as this may lose your eye-sight.
  • Page 23 5-6. CHECKS PRIOR TO REPAIRS Note 1: After step 4, each time the ^ “PROGRAM” button is pressed, the display will be switched between “0.7 mW*** These checks are performed before replacing parts according to ”, “6.2 mW*** $ ”, and “WP *** $ ”.
  • Page 24 10. Observe the waveform of the oscilloscope, and check that the 5-6-4. Focus Bias Check specified value is satisfied. Do not press the = , + but- Change the focus bias and check the focus tolerance amount. tons. Checking Procedure : 1.
  • Page 25 5-7. INITIAL SETTING OF ADJUSTMENT VALUE 5-9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT Note: Save the temperature data at that time in the non-volatile memory Mode which sets the adjustment results recorded in the non-volatile as 25 ˚C reference data. memory to the initial setting value. However the results of the Note : temperature compensation offset adjustment will not change to the 1.
  • Page 26 6. Press the = , + buttons so that the reading of the laser 5-11. TRAVERSE ADJUSTMENT power meter becomes 6.9 to 7.1 mW, press the ^ “PRO- Connection : Oscilloscope GRAM” button and save it. Note : Do not perform the emission with 7.0 mW more than 15 seconds continuously.
  • Page 27 11. Press the = , + buttons until the waveform of the oscil- 5-12. FOCUS BIAS ADJUSTMENT loscope moves closer to the specified value. Adjusting Procedure : In this adjustment, waveform varies at intervals of approx. 2%. 1. Load a test disk (MDW-74/AU-1). Adjust the waveform so that the specified value is satisfied as 2.
  • Page 28 5-13. ERROR RATE CHECK 5-15. AUTO GAIN CONTROL OUTPUT LEVEL 5-13-1. CD Error Rate Check ADJUSTMENT Checking Procedure : Be sure to perform this adjustment when the pickup is replaced. 1. Load a check disc (MD) TDYS-1. If the adjustment results becomes “Adjust NG!”, the pickup may be 2.
  • Page 29 5-15. ADJUSTING POINTS AND CONNECTING POINTS [BD BOARD] (SIDE A) CN101 D101 CN110 I+3V NOTE IC171 [BD BOARD] (SIDE B) IC101 IC121 IC192 NOTE: It is useful to use the jig. for checking the waveform. (Refer to Ser- vicing Note on page 6.)

  • Page 30: Diagrams

    SECTION 6 DIAGRAMS 6-1. CIRCUIT BOARDS LOCATION Back up board SW board BD board Power board Main board Panel board...

  • Page 31: Bd Section

    MDS-PC2 DIGITAL SERVO SIGNAL PROCESSOR, DIGITAL SIGNAL PROCESSOR EFM/ACIRC ENCODER/DECODER, SHOCK-PROOF MEMORY CONTROLLER, 6-2. BLOCK DIAGRAM – BD SECTION – ATRAC ENCODER/DECODER IC121 OVER WRITE HEAD DRIVE IC181 SCTX XINIT HR901 OVER WRITE DIN0 • HEAD DIN0 • HEAD DIN1...
  • Page 32 MDS-PC2 – MAIN SECTION – IC601 OPT IN 1 IC611 A/D,D/A CONVERTER IC301 J101 IC601 OPT IN 2 DATAO VINL1 DIGITAL DIN0 IC621 (OPTICAL) R-CH LINE AMP J101 VINR1 R-CH DIN1 IC381, 382 OPT OUT LINE (ANALOG) DOUT IC661 VOUTL...

  • Page 33: Main Section

    MDS-PC2 WAVEFORMS Note on Schematic Diagram: Note: – BD (1/2) SECTION – – MAIN SECTION – • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. • All resistors are in Ω and W or less unless otherwise 3.2Vp-p...

  • Page 34: Printed Wiring Board - Bd Section

    MDS-PC2 6-3. PRINTED WIRING BOARD – BD SECTION – • See page 30 for Circuit Boards Location. (Page 39) (Page 43) : SOLDER BRIDGE • SEMICONDUCTOR • SEMICONDUCTOR LOCATION LOCATION Ref. No. Location Ref. No. Location D101 IC101 D181 IC121...

  • Page 35: Schematic Diagram - Bd (1/2) Section

    MDS-PC2 6-4. SCHEMATIC DIAGRAM – BD (1/2) SECTION – • See page 33 for Waveform. • See page 45 for IC Block Diagrams. • See page 48 for IC Pin Function. (Page 36) (Page 36) (Page 36) (Page 36) (Page 36)

  • Page 36: Schematic Diagram - Bd (2/2) Section

    MDS-PC2 6-5. SCHEMATIC DIAGRAM – BD (2/2) SECTION – • See page 33 for Waveform. • See page 34 for Printed Wiring Board. (Page 35) (Page 35) (Page 35) (Page 35) (Page 35) (Page 35) (Page 35) POWER BOARD (Page 42)

  • Page 37: Schematic Diagram - Main (1/2) Section

    MDS-PC2 6-6. SCHEMATIC DIAGRAM – MAIN (1/2) SECTION – • See page 51 for IC Pin Function. • See page 33 for Waveform. • See page 39 for Printed Wiring Board. (Page 38) SW BOARD (Page 44) BD BOARD (2/2)

  • Page 38: Schematic Diagram - Main (2/2) Section

    MDS-PC2 6-7. SCHEMATIC DIAGRAM – MAIN (2/2) SECTION – • See page 33 for Waveform. • See page 47 for IC Block Diagrams. PANEL BOARD (Page (Page 40) (Page (Page LINE (ANALOG) (Page...

  • Page 39: Printed Wiring Board - Main Section

    MDS-PC2 6-8. PRINTED WIRING BOARD – MAIN SECTION – • See page 30 for Circuit Boards Location. LINE (ANALOG) POWER BD SWITCH PANEL BOARD BOARD BD BOARD BOARD (Page 43) (Page 44) (Page 34) (Page 41) • SEMICONDUCTOR LOCATION Ref. No.

  • Page 40: Schematic Diagram - Panel Section

    MDS-PC2 6-9. SCHEMATIC DIAGRAM – PANEL SECTION – • See page 33 for Waveform. MAIN BOARD (2/2) (Page 38)

  • Page 41: Printed Wiring Board - Panel Section

    MDS-PC2 6-10. PRINTED WIRING BOARD – PANEL SECTION – • See page 30 for Circuit Boards Location. MAIN BOARD (Page 39)

  • Page 42: Schematic Diagram - Power Section

    MDS-PC2 6-11. SCHEMATIC DIAGRAM – POWER SECTION – MAIN BOARD (1/2) (Page 37) BD BOARD (2/2) RESET (Page 36) IN 1 IN 2 DIGITAL (OPTICAL)

  • Page 43: Printed Wiring Board - Power Section

    MDS-PC2 6-12. PRINTED WIRING BOARD – POWER SECTION – • See page 30 for Circuit Boards Location. MAIN BOARD (Page 39) BD BOARD (Page 34) IN 2 DIGITAL IN 1 (OPTICAL) CONTROL A1 II • SEMICONDUCTOR • SEMICONDUCTOR LOCATION LOCATION Ref.

  • Page 44: Schematic Diagram - Bd Switch Section

    MDS-PC2 6-13. SCHEMATIC DIAGRAM – BD SWITCH SECTION – 6-15. IC BLOCK DIAGRAM • BD section IC101 CXA2523AR MAIN BOARD (1/2) 43 42 USROP – RF AGC (Page 37) – USRC RFA1 BPF3T RFA2 PEAK3T – HLPT –1 – –...
  • Page 45 IC121 CXD2654R 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 SPINDLE GENERATOR SERVO 75 TE MNT0 74 SE MNT1 MONITOR EACH 73 AVSS CONTROL BLOCK MNT2...
  • Page 46 • MAIN section IC301 UDA1341TS/N2 VINL2 VINR2 0DB/6DB 0DB/6DB ADC2R ADC2L VINL1 VINR1 SWITCH SWITCH ADC1L ADC1R AGCSTAT VDDD DIGITAL AGC VSSD DIGITAL MIXER DECIMATION FILTER OVERFLOW DATAO L3CLOCK DIGITAL L3-BUS L3MODE INTERFACE INTERFACE L3DATA DATAI DSP FEATURES SYSCLK PRAK INTERPOLATION FILTER QMUTE DETECTOR...

  • Page 47: Ic Pin Functions

    6-16. IC PIN FUNCTIONS • IC101 RF Amplifier (CXA2523AR) (BD board) Pin No. Pin Name Function I-V converted RF signal I input I-V converted RF signal J input Middle point voltage (+1.5V) generation output 4 to 9 A to F Signal input from the optical pick-up detector Light amount monitor input Laser APC output...
  • Page 48 • IC121 Digital Signal Processor, Digital Servo Signal Processor, EFM/ACIRC Encoder/Decoder, Shock-proof Memory Controller, ATRAC Encoder/Decoder, 2M Bit DRAM (CXD2654R) (BD board) Pin No. Pin Name Function FOK signal output to the system control (monitor output) MNT0 (FOK) “H” is output when focus is on MNT1 (SHCK) Track jump detection signal output to the system control (monitor output) MNT2 (XBUSY)
  • Page 49 Pin No. Pin Name Function Data input/output for DRAM 50, 51 D2, D3 MVCI Clock input from an external VCO (Fixed at “L”) I (S) ASYO Playback EFM duplex signal output ASYI I (A) Playback EFM comparator slice level input AVDD —...
  • Page 50 Pin No. Pin Name Function Tracking servo drive PWM output (+) TFDR — +3V power supply (Digital) DVDD Focus servo drive PWM output (+) FFDR Focus servo drive PWM output (–) FRDR 176.4 kHz clock signal output (X’tal) (Not used) Sled servo drive PWM output (–) SRDR Sled servo drive PWM output (+)
  • Page 51 • IC501 System Control (M30620MC-406FP) (MAIN board) Pin No. Pin Name Function Not used (Fixed at “L”) 1, 2 C1 error rate voltage output (Fixed at “L”) (Not used) C1ER AD error rate voltage output (Fixed at “L”) (Not used) ADER ADIP sync or subcode Q sync input from CXD2654R SQSY...
  • Page 52 Pin No. Function Pin Name Detection signal input from the playback position detection switch PB-P Not used Write: “H” REC/PB +3.3V power supply +3.3V — Not used (Fixed at “L”) — Ground Data signal input/output pin with the backup memory MNT3 (SLOCK) In the state of spindle servo lock from the CXD2564R WR PWR...

  • Page 53: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: The components identified by • Abbreviation • Items marked “*” are not stocked since they are mark ! or dotted line with mark seldom required for routine service. Some delay CND : Canadian model ! are critical for safety. : Singapore model should be anticipated when ordering these items.

  • Page 54: Mechanism Section (Mdm-5A)

    7-2. MECHANISM SECTION (MDM-5A) not supplied M103 MBU-5A Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 501 1-668-111-11 SW BOARD 4-996-227-01 LEVER (HEAD) * 502 4-996-217-01 CHASSIS 4-996-223-01 INSULATOR (F) 4-996-229-01 SPRING (HEAD LEVER), TORSION * 504 4-996-218-01 BRACKET (GUIDE R) 4-996-212-01 LEVER (LIMITTER)

  • Page 55: Base Unit Section (Mbu-5A)

    7-3. BASE UNIT SECTION (MBU-5A) HR901 not supplied not supplied M101 S102 M102 The components identified by mark ! Les composants identifiés par une or dotted line with mark ! are critical marque ! sont critiques pour la sécurité. for safety. Ne les remplacer que par une piéce Replace only with part number specified.

  • Page 56: Electrical Parts List

    SECTION 8 BACK UP ELECTRICAL PARTS LIST Note: • Due to standardization, replacements in the parts list • SEMICONDUCTORS The components identified by In each case, u: µ , for example: may be different from the parts specified in the mark ! or dotted line with mark uA...: µ...
  • Page 57 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark IC152 8-759-430-25 IC BH6511FS-E2 R136 1-216-049-91 RES,CHIP 1/10W IC171 8-759-487-04 IC BR24C02F-E2 R137 1-216-295-91 SHORT IC181 8-759-481-17 IC MC74ACT08DTR2 R140 1-216-029-00 METAL CHIP 1/10W IC192 8-759-460-72 IC BA033FP-E2 R142 1-216-073-00 METAL CHIP 1/10W...
  • Page 58 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C102 1-124-779-00 ELECT CHIP 10uF < DIODE > C181 1-126-395-11 ELECT 22uF C182 1-163-017-00 CERAMIC CHIP 0.0047uF 5% D390 8-719-016-74 DIODE 1SS352-TPH3 C183 1-163-009-11 CERAMIC CHIP 0.001uF D391 8-719-016-74 DIODE 1SS352-TPH3 C184...
  • Page 59 MAIN PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R189 1-216-037-00 METAL CHIP 1/10W < VIBRATOR > R191 1-216-057-00 METAL CHIP 2.2K 1/10W R192 1-216-057-00 METAL CHIP 2.2K 1/10W X351 1-579-314-11 VIBRATOR, CRYSTAL (22.5792MHz) X513 1-781-174-21 VIBRATOR, CERAMIC (10MHz) R201 1-216-049-91 RES,CHIP...
  • Page 60 PANEL POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < DIODE > R434 1-216-081-00 METAL CHIP 1/10W R435 1-216-091-00 METAL CHIP 1/10W D411 8-719-210-39 DIODE EC10QS04-TE12L5 R436 1-216-109-00 METAL CHIP 330K 1/10W D412 8-719-210-39 DIODE EC10QS04-TE12L5 R437 1-216-049-91 RES,CHIP 1/10W...
  • Page 61 POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < COIL > MISCELLANEOUS ************* L751 1-216-296-91 SHORT L752 1-216-296-91 SHORT 1-791-161-11 WIRE (FLAT TYPE) (15 CORE) L753 1-216-296-91 SHORT 1-791-160-11 WIRE (FLAT TYPE) (23 CORE)(180mm) 1-791-158-11 WIRE (FLAT TYPE) (23 CORE)(90mm) <...
  • Page 62 MDS-PC2 Sony Corporation 9-928-916-11 99F0986-1 Home Audio Company (SP) Printed in Japan © 1999. 6 Published by Quality Assurance Dept.

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