Manuals / Sony / Home Audio / Stereo System

Sony MDS-JB920 service manual 45, 46, • Circuit Boards Location, Note on Schematic Diagram

Models: MDS-JB920

1 72

Download 72 pages 46.67 Kb

Page 42

• Circuit Boards Location

• Circuit Boards Location

6-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

AC board

SW board

BAT board

HP board

PSW board

BD board

MAIN board

DISP board

VOL board

Note on Schematic Diagram:

•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 1/4 W or less unless otherwise specified.

•% : indicates tolerance.

•¢ : internal component.

•C : panel designation.

Note:	Note:
The components identi-	Les composants identifiés par
fied by mark !or dotted	une marque !sont critiques
line with mark !are criti-	pour la sécurité.
cal for safety.	Ne les remplacer que par une
Replace only with part	piéce portant le numéro
number specified.	spécifié.

•U : B+ Line.

•V : B– Line.

•Voltages and waveforms are dc with respect to ground in playback mode.

•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal produc- tion tolerances.

•Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc- tion tolerances.

•Circled numbers refer to waveforms.

•Signal path. E : PB j : REC

p : PB (Digital out)

l : REC (Digital in)

•Abbreviation

CND : Canadian model.

Note on Printed Wiring Boards:

•X : parts extracted from the component side.

•Y : parts extracted from the conductor side.

•¨ : Through hole.

•b : Pattern from the side which enables seeing.

Caution:
Pattern face side:	Parts on the pattern face side seen from
(Side B)	the pattern face are indicated.
Parts face side:	Parts on the parts face side seen from
(Side A)	the parts face are indicated.

• Indication of transistor.

C

These are omitted.

Q

B E

Q

B C E

These are omitted.

• Abbreviation

CND : Canadian model.

– 45 –

– 46 –

Image 42

Sony MDS-JB920 service manual 45, 46, • Circuit Boards Location, Note on Schematic Diagram, Note on Printed Wiring Boards

Contents

MDS-JB920 SPECIFICATIONSSERVICE MANUAL MINI DISC DECKSELF-DIAGNOSISFUNCTION – 2 –Table of Error Codes Items of Error History Mode Items and Contents– 3 – Selecting the Test ModeSECTION SERVICING NOTES TABLE OF CONTENTS6.DIAGRAMS DISASSEMBLYNotes on chip component replacement – 5 –Flexible Circuit Board Repairing ADVARSELJIG FOR CHECKING BD BOARD WAVEFORM – 7 – Record PrecedureDisplay Precedure – 8 – Checks Prior to Parts Replacement and AdjustmentsForced Reset ProcedurePrecedure – 9 –Retry Cause Display Mode Fig. 1 Reading the Test Mode Display– 10 – Reading the DisplayHexadecimal nBinary Conversion Table LOCATION OF CONTROLS SECTION GENERAL– 11 – • Front view • Rear view– 12 – – 13 – DISASSEMBLY – 14 –CASE SECTION– 15 – FRONT PANEL SECITONMAIN BOARD – 16 – MECHANISM SECTION MDM-5ASLIDER CAM – 17 – BASE UNIT MBU-5A,BD BOARDSW BOARD, LOADING MOTOR M103 SECTION TEST MODE 1. PRECAUTIONS FOR USE OF TEST MODE2. SETTING THE TEST MODE – 18 –– 19 – 5. SELECTING THE TEST MODE– 20 – 5-1.Operating the Continuous Playback Mode5-3. Non-VolatileMemory Mode EEP MODE 7. TEST MODE DISPLAYS – 21 –6. FUNCTIONS OF OTHER BUTTONS 4.Auto gain display Not used in servicing– 22 – MEANINGS OF OTHER DISPLAYSSECTION ELECTRICAL ADJUSTMENTS 1.PARTS REPLACEMENT AND ADJUSTMENT– 23 – Laser power meter 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON4. PRECAUTIONS FOR ADJUSTMENTS – 24 –6-1.Temperature Compensation Offset Check – 25 –6. CHECK PRIOR TO REPAIRS Checking ProcedureCD Error Rate Check – 26 –6-5.C PLAY Checking MO Error Rate Check 6-4.Focus Bias Check10. LASER POWER ADJUSTMENT 7. INITIAL SETTING OF ADJUSTMENT VALUE9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT – 27 –Adjusting Procedure 11. TRAVERSE ADJUSTMENTSpecification Connection12.FOCUS BIAS ADJUSTMENT – 29 –– 30 – 13.ERROR RATE CHECK15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT 14. FOCUS BIAS CHECKBD BOARD SIDE A 16. ADJUSTING POINTS AND CONNECTING POINTS– 31 – BD BOARD SIDE BSECTION DIAGRAMS – 32 –6-1.IC PIN FUNCTION DESCRIPTION – 33 – •BD BOARD IC121 CXD2654R– 34 – – 35 – – 36 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER– 37 – – 38 – MDS-JB920 – 39 –– 40 – – 42 – BLOCK DIAGRAM – SERVO Section –– 41 – MDS-JB920– 44 – 6-3.BLOCK DIAGRAM – MAIN Section –– 43 – MDS-JB920• Circuit Boards Location – 45 –– 46 – Note on Schematic Diagram– 48 – 6-5.PRINTED WIRING BOARDS – BD Section –– 47 – •See page 45 for Circuit Boards LocationMDS-JB920 – 49 –– 50 – Page– 52 – 6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See•– 51 – MDS-JB920MDS-JB920 – 53 –– 54 – • WaveformsMDS-JB920 – 55 –– 56 – Page Page Page Page Page Page– 57 – – 58 –MDS-JB920 MDS-JB920 – 59 –– 60 – Page Page Page Page– 61 – – 62 –MDS-JB920 – 63 – MDS-JB920• Semiconductor Location US, CND – 66 –MDS-JB920 US, CNDMDS-JB920 – 67 –– 68 – Page Page Page Page– 69 – 6-15.SCHEMATIC DIAGRAM - BD SWITCH SectionPRINTED WIRING BOARD – BD SWITCH Section – – 70 –CXD2654R – 71 –IC121 IC152 BH6511FS-E2IC100 – 72 –– MAIN Board – CXD8607N– 73 – IC200CXD8767N IC700 IC300SN74HC153ANS LA56321 CHASSIS SECTION 56 SECTION EXPLODED VIEWS– 75 – 2 16 17 18– 76 – 2 FRONT PANEL SECTION 6359 58 223 207 203 225 – 77 –3MECHANISM SECTION MDM-5A 206 201– 78 – 4BASE UNIT SECTION MBU-5A 252254 SECTION ELECTRICAL PARTS LIST AC BAT BD– 79 – – 80 – DISP – 81 –MAIN – 82 –MAIN – 84 – MAIN– 85 – MAINMAIN SW VOL – 87 –9-922-869-11 MDS-JB920Sony Corporation Home A&V Products Company