Sony MDS-JB730 Service Manual
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Sony MDS-JB730 Service Manual

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SERVICE MANUAL
U.S. and foreign patents licensed form Dolby Laboratories
Licensing Corporation.
MICROFILM
MDS-JB730
Model Name Using Similar Mechanism
MD Mechanism Type
Base Unit Type
Optical Pick-up Type
SPECIFICATIONS
AEP Model
UK Model
MDS-JE520
MDM-5D
MBU-5D
KMS-260B/J1N
MINIDISC DECK

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Summary of Contents for Sony MDS-JB730

  • Page 1 MDS-JB730 SERVICE MANUAL AEP Model UK Model Model Name Using Similar Mechanism MDS-JE520 U.S. and foreign patents licensed form Dolby Laboratories Licensing Corporation. MD Mechanism Type MDM-5D Base Unit Type MBU-5D Optical Pick-up Type KMS-260B/J1N SPECIFICATIONS MINIDISC DECK MICROFILM...

  • Page 2: Self-Diagnosis Function

    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 total rec Displays the recording time. 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: Table Of Contents

    LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY.
  • Page 5 CAUTION Flexible Circuit Board Repairing Danger of explosion if battery is incorrectly replaced. • Keep the temperature of the soldering iron around 270 ˚C dur- Replace only with the same or equivalent type recommended by ing repairing. the manufacturer. • Do not touch the soldering iron on the same conductor of the Discard used batteries according to the manufacturer’s instructions.
  • Page 6 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) VC : Reference level for checking the signal...
  • 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 optical pick-up label.
  • 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 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 10 Reading the Retry Cause Display Higher Bits Lower Bits Hexa- Details Hexadecimal decimal When 0 When 1 b7 b6 b5 b4 b3 b2 b1 b0 Binary Emphasis OFF Emphasis ON Monaural Stereo This is 2-bit display. Normally 01. 01:Normal audio. Others:Invalid Audio (Normal) Invalid Original...

  • Page 11: General

    SECTION 2 This section is extracted from instruction manual. GENERAL – 11 –...
  • Page 12 – 12 –...

  • Page 13: Disassembly

    SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. CASE (4095269) 1 four screws (CASE 3 TP2) 2 case (4095269) 1 three screws (CASE 3 TP2) FRONT PANEL SECTION 2 wire (flat type) (19 core) 1 connector (CN791) (CN421) 4 claw 1 connector...
  • Page 14 MAIN BOARD 1 wire (flat type) (21 core) (CN341) 1 wire (flat type) (23 core) (CN501) 2 power cord connector (CN901) 1 wire (flat type) (19 core) 3 four screws (CN421) (PTTWH3 3 two screws (PTTWH3 2 two connectors (CN502, 770) 5 MAIN board 4 five screws (BVTP3 8)
  • Page 15 SLIDEDR (CAM) 7 slider (Cam) • Note for Installation of Slider A (Cam) Set the shaft of Cam gear to 4 bracket (Guide L) be at the position in the figure. 1 two screws (P2.6 2 harness Set the shaft of Lever (O/C) to be at the position in the figure.
  • Page 16 SW BOARD, LOADING MOTOR (M103) 1 screw (PTPWH M2.6 2 gear B 3 two screws (PWH1.7 4 loading motor (M103) 6 SW board 5 three screws (BTP2.6 – 16 –...

  • Page 17: Test Mode

    SECTION 4 TEST MODE 1. PRECAUTIONS FOR USE OF TEST MODE • As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is stopped before setting and removing it. [EJECT     ] Even if the §...
  • Page 18 5. SELECTING THE TEST MODE [        AMS        ] ± There are 31 types of test modes as shown below. The groups can be switched by turning the ≠ knob. After selecting the [YES] [        AMS        ] ± group to be used, press the button. After setting a certain group, turning the ≠...
  • Page 19 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.) [        AMS        ] (2) Turn the ≠ ± knob and display “CPLAY MODE” (C30). [YES] (3) Press the button to change the display to “CPLAY MID”.
  • Page 20 6. FUNCTIONS OF OTHER BUTTONS Function Contents 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. The sled moves to the outer circumference only when this is pressed. The sled moves to the inner circumference only when this is pressed.
  • Page 21 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 SYNC CLV low speed mode CLV normal mode A.SPACE ABCD adjustment completed OVER Tracking offset cancel ON Tracking offset cancel OFF...

  • Page 22: Electrical Adjustments

    SECTION 5 ELECTRICAL ADJUSTMENTS 1. PARTS REPLACEMENT AND ADJUSTMENT • Check and adjust the mechanism deck as follows. The procedure changes according to the part replaced • Abbreviation : Optical pick-up OWH : Overwrite head • Temperature compensation offset check •...

  • Page 23: Electrical Adjustments

    2. PRECAUTIONS FOR CHECKING LASER DIODE 4. Use the following tools and measuring devices. • Check Disc (MD) TDYS-1 EMISSION (Part No. 4-963-646-01) To check the emission of the laser diode during adjustments, never • Test Disc (MDW-74/AU-1) (Part No. 8-892-341-41) view directly from the top as this may lose your eye-sight.
  • Page 24 [YES] 6. CHECK PRIOR TO REPAIRS Note 1: After step 4, each time the button is pressed, the display will be switched “LD 0.7 mW $ ”, “LD 6.2 mW $ ”, and These checks are performed before replacing parts according to “LD Wp ”.
  • Page 25 [YES] 9. Press the button to display “EFB = MO-P”. 6-4. Focus Bias Check Then, the optical pick-up moves to the pit area automatically Change the focus bias and check the focus tolerance amount. and servo is imposed. Checking Procedure : 10.
  • Page 26 7. INITIAL SETTING OF ADJUSTMENT VALUE 9. TEMPERATURE COMPENSATION OFFSET ADJUSTMENT 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 tempera- Note : ture compensation offset adjustment will not change to the initial setting 1.
  • Page 27 [        AMS        ] ± 7. Then, turn the ≠ knob to display “LDPWR 11. TRAVERSE ADJUSTMENT CHECK” (C02). Note 1: Data will be erased during MO reading if a recorded disc is [YES] 8. Press the button once to display “LD 0.9 mW $ ”.
  • Page 28 [        AMS        ] [YES] ± 8. Turn the ≠ knob so that the waveform of the 18. Press the button, display “EFB = SAV” for a mo- oscilloscope becomes the specified value. ment and save the adjustment results in the non-volatile [        AMS        ] (When the ±...
  • Page 29 13. ERROR RATE CHECK 15. AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT 13-1. CD Error Rate Check Be sure to perform this adjustment when the optical pick-up is Checking Procedure : replaced. 1. Load the check disc (MD) TDYS-1. If the adjustment results becomes “Adjust NG!”, the optical pick- [        AMS        ] ±...
  • Page 30 Adjustment Location: – 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 Notes on page 6) –...

  • Page 31: Diagrams

    MDS-JB730 SECTION 6 DIAGRAMS DIGITAL SIGNAL PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, 6-1. BLOCK DIAGRAM – SERVO Section – ATRAC ENCODER/DECODER IC121 (1/2) IC121 (1/2) OVER WRITE EFMO ADDT ADDT HEAD DRIVE IC181, Q181, 182 DATAI (Page 33) SAMPLING...

  • Page 32: Block Diagram - Main Section

    MDS-JB730 6-2. BLOCK DIAGRAM – MAIN Section – A/D, D/A CONVERTER IC321 SIGNAL PATH : PLAY (ANALOG OUT) J101 : REC (ANALOG IN) AINL HIGH-PASS FILTER, ADDT SDTO SUB- LINE AMP LINE (ANALOG) DIGITAL CONVERTER AINR TRACKTION IC301 ATTENUATOR BLOCK...

  • Page 33: Note For Printed Wiring Boards And Schematic Diagrams

    6-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS (In addition to this, the necessary note is printed in each block) Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. pF: µµF •...
  • Page 34 • Circuit Boards Location SW board HP board PSW board BD board MAIN board DISP board VOL board – 36 –...

  • Page 35: Printed Wiring Board - Bd Board

    MDS-JB730 6-4. PRINTED WIRING BOARD – BD Board – • See page 36 for Circuit Boards Location. S102 REFLECT DET, PROTECT DET LOW REFLECT RATE/ UNPROTECT (SLIDE) HIGH REFLECT RATE/ WRITE PROTECT (SPINDLE) (Page 45) (Page 45) • Semiconductor • Semiconductor...

  • Page 36: Schematic Diagram - Bd Board (1/2)

    MDS-JB730 6-5. SCHEMATIC DIAGRAM – BD Board (1/2) – • See page 43 for Waveforms. • See page 55 for IC Block Diagrams. (Page 41) (Page 41) (Page 41) (Page 42) (Page 42) (Page 42) (Page 42) – 39 –...

  • Page 37: Schematic Diagram - Bd Board (2/2)

    MDS-JB730 6-6. SCHEMATIC DIAGRAM – BD Board (2/2) – • See page 43 for Waveforms. • See page 55 for IC Block Diagrams. (Page 39) (Page 39) (Page 39) (Page 40) (Page 40) (Page 40) (Page 40) (Page 48) (Page 47) •...

  • Page 38: Schematic Diagram - Sw Board

    MDS-JB730 • Waveforms – BD Board – 6-7. SCHEMATIC DIAGRAM – SW Board – 1 IC101 1, 2 (I, J) (Play mode) 6 IC121 @• (XBCK) 3 IC321 9 (XTI) 3.8 Vp-p 5.4 Vp-p 0.46 Vp-p 45.1584 MHz 2.8224 MHz 2 IC101 4 (A) (Play mode) 7 IC121 @ª...

  • Page 39: Printed Wiring Board - Main Board

    MDS-JB730 6-9. PRINTED WIRING BOARD – MAIN Board – • See page 36 for Circuit Boards Location. (Page 44) (Page 52) (Page 38) (Page 51) (Page 38) (Page 52) • Semiconductor Location Ref. No. Location Ref. No. Location Ref. No. Location Ref.

  • Page 40: Schematic Diagram – Main Board (1/2)

    MDS-JB730 6-10. SCHEMATIC DIAGRAM – MAIN Board (1/2) – • See page 43 for Waveforms. (Page 49) (Page 54) (Page 41) (Page 54) (Page 49) (Page 41) (Page 44) • Voltages and waveforms are dc with respect to ground under no-signal conditions.

  • Page 41: Schematic Diagram - Main Board (1/2)

    MDS-JB730 6-11. SCHEMATIC DIAGRAM – MAIN Board (2/2) – • • See page 43 for Waveforms. See page 57 for IC Block Diagrams. (Page 48) (Page 54) (Page The components identified by mark ! or dotted • Voltages and waveforms are dc with respect to ground line with mark ! are critical for safety.

  • Page 42: Printed Wiring Boards – Panel Section

    MDS-JB730 6-12. PRINTED WIRING BOARDS – PANEL Section – • See page 36 for Circuit Boards Location. (Page 45) (Page 51) • Semiconductor • Semiconductor Location Location – DISP Board – – PSW Board – Ref. No. Location Ref. No. Location...

  • Page 43: Schematic Diagram - Panel Section

    MDS-JB730 6-13. SCHEMATIC DIAGRAM – PANEL Section – • See page 43 for Waveforms. (Page 50) (Page 48) (Page 47) • Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : STOP – 53 –...
  • Page 44 • IC Block Diagrams IC121 CXD2656R – BD Board – IC101 CXA2523AR 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 43 42 75 TE MNT0...

  • Page 45: Main Board

    – MAIN Board – IC310 M5293L IC431 LA5632 – REFERENCE STBY VOLTAGE ANA5 – REFERENCE ON/OFF – VOLTAGE SYS3.3 – OVERHEAT OVERCURRENT PROTECTION LIMITTER – 3.3V B.BAK – DELAY P. DOWN CIRCUIT IC321 AK4524 – VCOM DELAY S. RESET CIRCUIT VREF AINR AOUTR+...

  • Page 46: Ic Pin Function Description

    6-14. IC PIN FUNCTION DESCRIPTION BD BOARD IC101 CXA2523AR (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin Name Description I-V converted RF signal I input from the optical pick-up block detector I-V converted RF signal J input from the optical pick-up block detector Middle point voltage (+1.65V) generation output terminal 4 to 9 A to F...
  • Page 47 BD BOARD IC121 CXD2656R (DIGITAL SIGNAL PROCESSOR, DIGITAL SERVO PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER) Pin No. Pin Name Description Focus OK signal output to the system controller (IC501) MNT0 (FOK) “H” is output when focus is on (“L”: NG) MNT1 (SHOCK) Track jump detection signal output to the system controller (IC501) MNT2 (XBUSY)
  • Page 48 Pin No. Pin Name Description XRAS Row address strobe signal output to the D-RAM (IC124) “L” active Write enable signal output to the D-RAM (IC124) “L” active Two-way data bus with the D-RAM (IC124) MVCI I (S) Digital in PLL oscillation input from the external VCO Not used (fixed at “L”) ASYO Playback EFM full-swing output terminal ASYI...
  • Page 49 Pin No. Pin Name Description SRDR Sled servo drive PWM signal (–) output to the BH6511FS (IC152) SFDR Sled servo drive PWM signal (+) output to the BH6511FS (IC152) SPRD Spindle servo drive PWM signal (–) output to the BH6511FS (IC152) SPFD Spindle servo drive PWM signal (+) output to the BH6511FS (IC152) I (S)
  • Page 50 MAIN BOARD IC501 M30624MG-223FP (SYSTEM CONTROLLER) Pin No. Pin Name Description 1, 2 Not used (open) Monitor output terminal for the test C1 error rate is output when test mode ADER Monitor output terminal for the test ADER is output when test mode Subcode Q sync (SCOR) input from the CXD2656R (IC121) SQSY “L”...
  • Page 51 Pin No. Pin Name Description MUTE Audio line muting on/off control signal output terminal “L”: line muting on Strobe signal output to the power supply circuit “L”: standby mode, “H”: power on Detection input from the disc chucking-in detect switch “L”: chucking CHACK IN Not used (fixed at “H”)
  • Page 52 Pin No. Pin Name Description Focus OK signal input from the CXD2656R (IC121) MNT0 (FOK) “H” is input when focus is on (“L”: NG) Clock signal output to the EEPROM (IC171) Recording data output enable signal output to the CXD2656R (IC121) and overwrite head SCTX driver (IC181) Writing data transmission timing output (Also serves as the magnetic head on/off output)

  • Page 53: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: • Items marked “*” are not stocked since they • -XX and -X mean standardized parts, so they The components identified by mark ! or dotted line with mark may have some difference from the original are seldom required for routine service.
  • Page 54 Remark Ref. No. Part No. Description Remark 4-998-590-82 PANEL, FRONT 4-996-690-13 LID (CARTRIDGE) 4-942-568-41 EMBLEM (NO.5), SONY 4-976-593-11 SPRING (LID), TORSION 4-998-607-01 INDICATOR (POWER) 4-998-593-01 BUTTON (EDIT) 4-950-189-01 KNOB (A) (VOL) 1-673-505-11 VOL BOARD 4-998-598-01 WINDOW (DISPLAY) 4-998-595-01 KNOB (SLIDE)
  • Page 55 (3) MECHANISM SECTION (MDM-5D) not supplied M103 MBU-5D Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 201 1-668-111-11 SW BOARD 4-996-227-01 LEVER (HEAD) 4-996-229-01 SPRING (HEAD LEVER), TORSION * 202 4-996-217-01 CHASSIS 4-996-223-01 INSULATOR (F) (BLACK) 4-996-212-01 LEVER (LIMITTER) * 204 4-996-218-01 BRACKET (GUIDE R)
  • Page 56 (4) BASE UNIT SECTION (MBU-5D) HR901 not supplied not supplied M101 S102 not supplied M102 The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part num- ber specified. Ref. No. Part No.

  • Page 57: Electrical Parts List

    SECTION 8 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark ! or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.
  • Page 58 DISP Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < COIL/FERRITE BEAD/SHORT > R145 1-216-073-00 METAL CHIP 1/10W L101 1-414-813-11 FERRITE R146 1-216-037-00 METAL CHIP 1/10W L102 1-414-813-11 FERRITE R147 1-216-025-00 RES, CHIP 1/10W L103 1-414-813-11 FERRITE R148 1-216-045-00 METAL CHIP 1/10W...
  • Page 59 DISP Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C761 1-126-154-11 ELECT 47uF 6.3V C762 1-164-159-11 CERAMIC 0.1uF < SWITCH/ROTARY ENCODER > C770 1-164-159-11 CERAMIC 0.1uF S701 1-762-875-21 SWITCH, KEYBOARD (REC r) C771 1-164-159-11 CERAMIC 0.1uF S702 1-762-875-21 SWITCH, KEYBOARD (p) C772...
  • Page 60 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-4724-660-A MAIN BOARD, COMPLETE C392 1-126-933-11 ELECT 100uF ********************* C401 1-164-159-11 CERAMIC 0.1uF 7-685-646-79 SCREW +BVTP 3X8 TYPE2 N-S C402 1-164-159-11 CERAMIC 0.1uF C403 1-164-159-11 CERAMIC 0.1uF <...
  • Page 61 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark J851 1-779-655-21 JACK (SMALL TYPE) (2 GANG) < CONNECTOR > (CONTROL A1 II) CN341 1-784-418-11 CONNECTOR, FFC (LIF (NON-ZIF)) 21P < COIL > * CN391 1-564-708-11 PIN, CONNECTOR (SMALL TYPE) 6P CN421 1-779-287-11 CONNECTOR, FFC (LIF (NON-ZIF)) 19P L341...
  • Page 62 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R548 1-249-429-11 CARBON 1/4W R202 1-249-431-11 CARBON 1/4W R549 1-249-429-11 CARBON 1/4W R203 1-247-887-00 CARBON 220K 1/4W R550 1-249-429-11 CARBON 1/4W R204 1-260-091-11 CARBON 1/2W R206 1-249-401-11 CARBON 1/4W R551 1-249-429-11 CARBON...
  • Page 63 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < CONNECTOR > MISCELLANEOUS ************** CN750 1-784-641-11 CONNECTOR, BOARD TO BOARD 11P 1-783-138-11 WIRE (FLAT TYPE) (19 CORE) < DIODE > 1-783-139-11 WIRE (FLAT TYPE) (21 CORE) 1-783-140-11 WIRE (FLAT TYPE) (23 CORE) D756 8-719-313-43 LED SEL6210S-TH10 (STANDBY) 1-569-972-21 SOCKET, SHORT 2P...
  • Page 64 MDS-JB730 Sony Corporation 99E057548-1 9-928-876-11 Home Audio Company Printed in Hungary © 1999. 5 – 76 – Published by Quality Assurance Dept.

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