Sony MDS-EX770 Service Manual
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Sony MDS-EX770 Service Manual

Mini disc system
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SERVICE MANUAL
•PARTS LIST(The difference between MDS-EX77 and MDS-EX770)
Page
Ref. No.
Part No.
–––––––
–––––––
1
X-4947-652-1 PANEL ASSY, FRONT
3
4-985-889-01 BUTTON(REC)(CD SYNC, REC)
4
4-985-890-01 BUTTON(MODE)
5
4-985-891-01 BUTTON(EJECT) ( EJECT)
6
4-985-894-01 BUTTON(EDIT)
68
7
X-4947-763-1 BUTTON(F/R)ASSY(
8
4-985-892-01 BUTTON(PLAY)(
* 15
4-985-899-11 CASE
* 16
4-985-898-12 PANEL(MDS), BACK
23
4-985-896-01 KNOB(REC)
24
4-985-925-01 KNOB(JOG)
• Items marked "*" are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
MICROFILM
9-922-856-11
MDS-EX770 is the mini disk deck section in DHC-EX770MD.
The mechanical and electorical specifications of MDS-EX770 is almost
same as MDS-EX77.
So this manual contains only the points which differ from MDS-EX77.
For the informations not contained in this manual, please refer to the
MDS-EX77 service manuals (9-960-938- ) previously issued.
MDS-EX77
Description
–––––––––
,
)
, )
Sony Corporation
Home A&V Products Company
MDS-EX770
Ref. No.
Part No.
–––––––
–––––––
1
X-4949-866-1 PANEL ASSY, FRONT
3
4-985-889-11 BUTTON(REC)(CD SYNC, REC)
4
4-985-890-11 BUTTON(MODE)
5
4-985-891-11 BUTTON(EJECT) ( EJECT)
6
4-985-894-11 BUTTON(EDIT)
7
X-4949-931-1 BUTTON(F/R)ASSY(
8
4-985-892-31 BUTTON(PLAY)(
* 15
4-985-899-71 CASE
* 16
4-985-898-21 PANEL(MDS), BACK
23
4-985-896-21 KNOB(REC)
24
4-985-925-11 KNOB(JOG)
AEP Model
UK Model
MDS-EX770
Description
–––––––––
,
)
, )
MINI DISC SYSTEM
98D001648-1D
Printed in Japan ©1998.4
Published by Quality Assurance Dept.
(Shibaura)

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  • Page 1 MDS-EX770 SERVICE MANUAL AEP Model UK Model MDS-EX770 is the mini disk deck section in DHC-EX770MD. The mechanical and electorical specifications of MDS-EX770 is almost same as MDS-EX77. So this manual contains only the points which differ from MDS-EX77. For the informations not contained in this manual, please refer to the MDS-EX77 service manuals (9-960-938- ) previously issued.
  • Page 2 MDS-EX77 SERVICE MANUAL AEP Model UK Model E Model MDS-EX77 is the mini disc deck section in DHC-MD77/EX77MD. U.S and foreign patents licensed from Dolby Labora- Model Name Using Similar Mechanism MDS-S37 tories Licensing Corporation. MD Mechanism Type MDM-3A Optical Pick-up Name KMS-260A/J1N SPECIFICATIONS MINI DISC DECK...

  • Page 3: Table Of Contents

    COMPONENTS IDENTIFIED BY MARK ! OR DOTTED 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 PUBLISHED BY SONY.
  • Page 4 CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer’s instructions. ADVARSEL! Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering. Udskiftning må kun ske med batteri af samme fabrikat og type.

  • Page 5: Servicing Notes

    SECTION 1 SERVICING NOTES 1-1. POWER SUPPLY DURING SERVICING 1-2. FLUORESCENT INDICATOR TUBE/BUTTONS/ JOG&LEDs CHECK MODE This set has no power supply in it, and it does not operate indi- vidually. Therefore, connect to the pre/main amplifier system (TA- 1. While pressing the CD SYNC + CONTINUE buttons simul- EX77) for the DHC-MD77 or DHC-EX77MD in servicing.

  • Page 6: Retry Cause Display Mode At Record

    1-4. RETRY CAUSE DISPLAY MODE AT RECORD Outline: • In this mode, a cause of retry at recording can be displayed. Thus, it will help find out a faulty location of the set. • The contents displayed are data quantity stored in D-RAM, re- try count, and retry cause.
  • Page 7 Table 1-1. Description of Retry Cause Display Lower Bit Upper Bit Hexa- Name of Hexa- decimal Description Retry Cause decimal spindle slow When spindle speed slow was detected shock *1 When shock over 3.5 was detected When ADER was counted more than 5 times ader 5 successively Decimal...

  • Page 8: General

    SECTION 2 This section is extracted from instruction manual. GENERAL – 7 –...
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  • Page 20: Disassembly

    SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. CASE, FRONT PANEL SECTION (Page 19) MECHANISM DECK (Page 20) BD BOARD SLIDER COMPLETE BRACKET (T), (L), (R) SUB CHASSIS OVER WRITE HEAD (Page 21) ASS'Y (Page 21) (Page 20) (Page 22)
  • Page 21 MECHANISM DECK 3 four screws (BVTT3 × 6) 4 mechanism deck 1 flat wire (29 core) (CN402) 2 flat wire (19 core) (CN401) BRACKET (T), (L), (R) 1 four screws (BVTT2 × 3) 3 screw (BVTT2 × 3) 2 bracket (T) 4 bracket (joint) 5 two screws...
  • Page 22 BD BOARD 2 flat cable (15 core) (CN106) 4 OP relay flexible board (CN101) 1 flexible board (over write head) 5 BD board 3 screws (BVTT2 × 4) SUB CHASSIS 1 two step screws 1 two step screws 2 two insulators 2 two insulators part A part A...
  • Page 23 SHUTTER ASS’Y 1 stopper washer 2 shaft (shutter) A shutter ass’y shaft (shutter) B 3 shutter ass’y shaft (shutter) A hole B hole A When installing, install the shaft (shutter) A into the hole as show in the figune before installing the shaft (shutter) B into the hole B.
  • Page 24 SLIDER COMPLETE ASS’Y claw 3 Set the shaft of gear (LB) to be at the position in the figure. claw 45° 1 special screw 2 retainer (gear) 4 Remove the slider complete ass’y (M1.7 × 1.4) in the direction of arrow with putting out of two claws.

  • Page 25: Test Mode

    SECTION 4 TEST MODE 4-1. PRECAUTIONS FOR USE OF TEST MODE 4-5. SELECTING THE TEST MODE 1. As loading related operations will be performed regardless of Thirteen test modes are selected by turning the SELECTOR knob. the test mode operations being performed, be sure to check that the disc is stopped before setting and removing it.

  • Page 26: Operating The Continuous Playback Mode

    4-6. OPERATING THE CONTINUOUS PLAYBACK 4-7. OPERATING THE CONTINUOUS RECORDING MODE MODE 4-6-1. Entering the Continuous Playback Mode 4-7-1. Entering the Continuous Recording Mode 1. Set the disc in the unit. (Whichever recordable discs or discs 1. Set the MO disc in the unit. (Refer to note 3.) for playback only are available.) 2.

  • Page 27: Eep Mode

    4-8. EEP MODE 1. MODE display Displays “TEMP ADJUST”, “CPLAY MODE”, etc.. This mode reads and writes the contents of the non-volatile memory. 2. Error rate display It is not used in servicing. If set accidentally, press the Error rates are displayed as follows. EDIT/NO button immediately to exit it.

  • Page 28: Electrical Adjustments

    SECTION 5 ELECTRICAL ADJUSTMENTS 5-3. PRECAUTIONS FOR ADJUSTMENTS 5-1. PRECAUTIONS FOR CHECKING LASER DI- 1) When replacing the following parts, perform the adjustments ODE EMISSION and checks with ® in the order shown in the following table. To check the emission of the laser diode during adjustments, never view directly from the top as this may lose your eyesight.
  • Page 29 5-5. TEMPERATURE COMPENSATION OFFSET 5-6. LASER POWER ADJUSTMENT ADJUSTMENT Connection: Save the temperature data at that time in the non-volatile memory laser power meter as 25 °C reference data. Notes: 1. Usually, do not perform this adjustment. 2. Perform this adjustment in an ambient temperature of 22 °C to Optical pick-up 28 °C.

  • Page 30: Traverse (E-F Balance) Adjustment

    5-7. TRAVERSE (E-F BALANCE) ADJUSTMENT 8. Turning the SELECTOR knob so that the waveforms of the oscilloscope becomes the specified value. (When the Note 1: Data will be erased during MO reading if a recorded SELECTOR knob is turned, the “ ” of “EFB= MO-W”...

  • Page 31: Focus Bias Adjustment

    5-8. FOCUS BIAS ADJUSTMENT 5-9. ERROR RATE CHECK Adjusting Method: 5-9-1. CD Error Rate Check 1. Load a continuously recorded disc (Refer to “5-4. Creating Checking Method: MO Continuously Recorded Disc”.). 1. Load a test disc TDYS-1. 2. Turning the SELECTOR knob and display “CPLAY MODE”. 2.

  • Page 32: Adjusting Points And Connecting Points

    SECTION 6 DIAGRAMS • Circuit Boards Location 5-11. ADJUSTING POINTS AND CONNECTING POINTS [BD BOARD] (COMPONENT SIDE) CN110 BD board I+3V SW board CN101 D101 PANEL board MAIN board IC192 REC VOL board [BD BOARD] (CONDUCTOR SIDE) IC171 IC101 IC121 –...

  • Page 33: Block Diagram (1/2)

    MDS-EX77 6-1. BLOCK DIAGRAM (1/2) ADDT DADT HR901 OVER WRITE HEAD MD DIGITAL OPTICAL OVER WRITE OVER WRITE OPTICAL EFMO ADDT INPUT HEAD DRIVE HEAD DRIVE DIGITAL IN IC301 Q181, 182 IC181 DIGITAL INPUT WAVE SHAPER CD PLAYER SELECTOR Q180 FILI DIGITAL IC303...

  • Page 34: Block Diagram (2/2)

    MDX-EX77 6-2. BLOCK DIAGRAM (2/2) LINE AMP IC101(1/2) J101 • SIGNAL PATH MIC2 INLP –AD2 SWI2 +AD2 INV2 SWO2 LINE2 : PLAY INLM ADDT ADDT : REC I/O CIRCUIT CONVERTER INRP  MD ANALOG IN CIRCUIT  INRM R-CH RV801 ...
  • Page 39 • Waveforms – MAIN/DISPLAY Section – – MD MECHANISM DECK Section – 6 IC151 #¡ (CAPA+) (Play Mode) !¡ IC121 @¶ (FS256) 1 IC701 %• (OSC0) 1 IC101 1, 2 (I, J) (Play Mode) 6 IC201 !¡, @§ (BCK1, BCK2) Approx.

  • Page 40: Md Mechanism Deck Section

    • IC Block Diagrams – MD MECHANISM DECK Section – IC101 CXA2523R 43 42 USROP – RF AGC – USRC RFA1 BPF3T RFA2 PEAK3T – HLPT –1 – – –2 – CFST PTGR TEMP PEAK – –2 – BOTTOM 36 BOTM –...
  • Page 41 IC121 CXD2650R 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 75 AUX2 SPINDLE GENERATOR SERVO 74 TE MNT0 73 SE MNT1 MONITOR EACH 72 AVSS CONTROL BLOCK...

  • Page 42: Main/Display Section

    – MAIN/DISPLAY Section – IC101 CXA8065S LINE02 LINE1 PMUTE MIC1 LINE01 SW01 MUTE LINE/MIC SWI1 – –A/D1 +D/A1 INV1 – 2.35k +D/A1 +D/AO1 +A/D1 LP1N1 A/DREF – 13.2k VREF LPOUT1 +A/D2 GND1 2.35k LPOUT2 – 13.2k 13.2k INV2 –A/D2 LPIN2 –...
  • Page 43 IC311 LB1641 T.S.D O.C.P MOTOR MOTOR DRIVE DRIVE FWD/REV/STOP CONTROL LOGIC IC501 LA5620 – STBY ANA5 – SYS3.3 – – 3.3V BACK – DELAY CIRCUIT P. DOWN – DELAY CIRCUIT VREF S. RESET – 58 –...

  • Page 44: Ic Pin Function Description

    6-7. IC PIN FUNCTION DESCRIPTION BD BOARD IC101 CXA2523R (RF AMPLIFIER) Pin No. Pin Name I / O Function 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 45 BD BOARD IC121 CXD2650R (DIGITAL SIGNAL PROCESSOR, DIGITAL SERVO PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER, 2M BIT D-RAM) Pin No. Pin Name I / O Function Focus OK signal output to the system controller (IC401) “H” is output when focus is on SHCK Track jump detection signal output to the system controller (IC401) XBUSY...
  • Page 46 Pin No. Pin Name I / O Function DVSS — Ground terminal (digital system) Output enable signal output to the external D-RAM Not used (open) XCAS Column address strobe signal output to the external D-RAM Not used (open) Address signal output to the external D-RAM Not used (open) XRAS Row address strobe signal output to the external D-RAM...
  • Page 47 Pin No. Pin Name I / O Function TRDR Tracking servo drive PWM signal (–) output to the BH6511FS (IC152) TFDR Tracking servo drive PWM signal (+) output to the BH6511FS (IC152) DVDD — Power supply terminal (+3.3V) (digital system) FFDR Focus servo drive PWM signal (+) output to the BH6511FS (IC152) FRDR...
  • Page 48 MAIN BOARD IC201 CXD8607N (A/D, D/A CONVERTER) Pin No. Pin Name I / O Function INRP R-ch analog signal (+) input terminal INRM R-ch analog signal (–) input terminal REFI Reference voltage (+3.3V) input terminal (for A/D converter section) AVDD —...
  • Page 49 Pin No. Pin Name I / O Function VDD2 — Power supply terminal (+5V) (for L-ch side D/A converter section, digital system) VDD1 — Power supply terminal (+5V) (for A/D converter section, digital system) VDD1 — Power supply terminal (+5V) (for A/D converter section, digital system) VSS1 —...
  • Page 50 MAIN BOARD IC401 RU8X12MF-0010 (SYSTEM CONTROLLER) Pin No. Pin Name I / O Function DAOUT0 Output terminal for the test C1 is output when test mode DAOUT1 Output terminal for the test ADER is output when test mode Key input terminal (A/D input) KEY0 fl, ), 0, p, ENTER/YES, EDIT/NO keys input (S701 to S706) Key input terminal (A/D input)
  • Page 51 Pin No. Pin Name I / O Function LD LOW Loading motor voltage control signal output to the loading motor driver (IC311) — Not used (open) MNT2 Monitor 2 signal input from the CXD2650R (IC121) MNT3 Monitor 3 signal input from the CXD2650R (IC121) LED0 LED drive signal output terminal Not used (open)
  • Page 52 Pin No. Pin Name I / O Function BEEP Beep sound drive signal output terminal Not used (open) ADARES Reset signal output to the A/D, D/A converter (IC201) “L”: reset SWL-A Not used (open) SEL-B Not used (open) Laser modulation select signal output Playback power: “L”, Stop: “H”, Recording power: 0.5 sec...

  • Page 53: Exploded Views

    Remark Ref. No. Part No. Description Remark X-4947-652-1 PANEL ASSY, FRONT 3-363-099-01 SCREW (CASE 3 TP2) 4-962-708-01 EMBLEM (4-A), SONY * 15 4-985-899-11 CASE 4-985-889-01 BUTTON (REC) (CD SYNC, r REC) * 16 4-985-898-12 PANEL (MDS), BACK 4-985-890-01 BUTTON (MODE)
  • Page 54 (2) MECHANISM DECK SECTION-1 (MDM-3A) not supplied not supplied supplied not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-628-167-01 SCREW, STEP 1-660-966-11 OP RELAY FLEXIBLE BOARD 4-987-327-01 INSULATOR * 57 A-4699-092-A BD BOARD, COMPLETE 4-986-959-01 WASHER, STOPPER 1-777-517-11 WIRE (FLAT TYPE) (15 CORE) 4-987-736-01 SHAFT (SHUTTER)
  • Page 55 (3) MECHANISM DECK SECTION-2 (MDM-3A) not supplied not supplied not supplied M902 M903 M901 HR901 The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref.

  • Page 56: 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 parts list may be different from the parts speci- are seldom required for routine service. ! or dotted line with mark ! are critical for safety.
  • Page 57 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark IC171 8-759-428-58 IC XL24C01AF-E2 R142 1-216-073-00 METAL CHIP 1/10W IC181 8-759-095-65 IC TC74ACT540FS R143 1-216-073-00 METAL CHIP 1/10W IC192 8-759-426-95 IC L88MS33T-TL R144 1-216-025-00 METAL CHIP 1/10W <...
  • Page 58 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C004 1-126-968-11 ELECT 100uF 20% 50V C372 1-164-159-11 CERAMIC 0.1uF C005 1-126-968-11 ELECT 100uF 20% 50V C391 1-164-159-11 CERAMIC 0.1uF C392 1-164-159-11 CERAMIC 0.1uF C006 1-126-941-11 ELECT 470uF 20% 25V C007...
  • Page 59 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D008 8-719-200-82 DIODE 11ES2 Q456 8-729-422-57 TRANSISTOR UN4111 D009 8-719-200-82 DIODE 11ES2 Q461 8-729-422-57 TRANSISTOR UN4111 D011 8-719-200-82 DIODE 11ES2 Q501 8-729-900-80 TRANSISTOR DTC114ES D012 8-719-200-82 DIODE 11ES2 Q502 8-729-422-57 TRANSISTOR UN4111 D013...
  • Page 60 MAIN PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R302 1-247-895-00 CARBON 470K 1/4W R541 1-247-702-11 CARBON 1/4W ¡ R303 1-249-437-11 CARBON 1/4W R542 1-247-702-11 CARBON 1/4W ¡ R304 1-249-437-11 CARBON 1/4W ¡ R543 1-247-702-11 CARBON 1/4W R311 1-249-429-11 CARBON...
  • Page 61 PANEL REC VOL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C756 1-164-159-11 CERAMIC 0.1uF R761 1-247-807-31 CARBON 1/4W C758 1-162-215-31 CERAMIC 47PF R762 1-247-807-31 CARBON 1/4W C760 1-162-294-31 CERAMIC 0.001uF 10% 50V C761 1-162-294-31 CERAMIC 0.001uF 10% 50V R763...
  • Page 62 Ref. No. Part No. Description Remark 1-777-558-11 WIRE (FLAT TYPE) (19 CORE) 1-777-559-11 WIRE (FLAT TYPE) (29 CORE) 1-777-473-11 WIRE (FLAT TYPE) (5 CORE) 1-660-966-11 OP RELAY FLEXIBLE BOARD 1-777-517-11 WIRE (FLAT TYPE) (15 CORE) ¡ 8-583-028-02 OPTICAL PICK-UP KMS-260A/J1N HR901 1-500-396-11 HEAD, OVER WRITE M901...
  • Page 63 MDS-EX77 Sony Corporation 97D0573-1 Printed in Japan © 1997. 4 9-960-938-11 Home A&V Products Company Published by General Engineering Dept. – 78 – (Shibaura)

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