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MDS-JB920 service manual 13
Models:
MDS-JB920
1
13
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72 pages
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Specs
Parts list
Section Diagrams
Notes on chip component replacement
Adjusting Points And Connecting Points
Forced Reset
Disassembly
Checking Procedure
C PLAY Checking MO Error Rate Check
Section Electrical Adjustments
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Contents
SERVICE MANUAL
SPECIFICATIONS
MDS-JB920
MINI DISC DECK
– 2 –
SELF-DIAGNOSISFUNCTION
– 3 –
Items of Error History Mode Items and Contents
Table of Error Codes
Selecting the Test Mode
6.DIAGRAMS
TABLE OF CONTENTS
SECTION SERVICING NOTES
DISASSEMBLY
Flexible Circuit Board Repairing
– 5 –
Notes on chip component replacement
ADVARSEL
JIG FOR CHECKING BD BOARD WAVEFORM
Record Precedure
– 7 –
Display Precedure
Forced Reset
Checks Prior to Parts Replacement and Adjustments
– 8 –
Procedure
Retry Cause Display Mode
– 9 –
Precedure
Fig. 1 Reading the Test Mode Display
Reading the Display
– 10 –
Hexadecimal nBinary Conversion Table
– 11 –
SECTION GENERAL
LOCATION OF CONTROLS
• Front view • Rear view
– 12 –
– 13 –
CASE
– 14 –
DISASSEMBLY
SECTION
FRONT PANEL SECITON
– 15 –
MAIN BOARD
MECHANISM SECTION MDM-5A
– 16 –
SLIDER CAM
BASE UNIT MBU-5A,BD BOARD
– 17 –
SW BOARD, LOADING MOTOR M103
2. SETTING THE TEST MODE
1. PRECAUTIONS FOR USE OF TEST MODE
SECTION TEST MODE
– 18 –
5. SELECTING THE TEST MODE
– 19 –
5-1.Operating the Continuous Playback Mode
– 20 –
5-3. Non-VolatileMemory Mode EEP MODE
6. FUNCTIONS OF OTHER BUTTONS
– 21 –
7. TEST MODE DISPLAYS
4.Auto gain display Not used in servicing
MEANINGS OF OTHER DISPLAYS
– 22 –
1.PARTS REPLACEMENT AND ADJUSTMENT
SECTION ELECTRICAL ADJUSTMENTS
– 23 –
4. PRECAUTIONS FOR ADJUSTMENTS
2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON
Laser power meter
– 24 –
6. CHECK PRIOR TO REPAIRS
– 25 –
6-1.Temperature Compensation Offset Check
Checking Procedure
6-5.C PLAY Checking MO Error Rate Check
– 26 –
CD Error Rate Check
6-4.Focus Bias Check
9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT
7. INITIAL SETTING OF ADJUSTMENT VALUE
10. LASER POWER ADJUSTMENT
– 27 –
Specification
11. TRAVERSE ADJUSTMENT
Adjusting Procedure
Connection
– 29 –
12.FOCUS BIAS ADJUSTMENT
15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT
13.ERROR RATE CHECK
– 30 –
14. FOCUS BIAS CHECK
– 31 –
16. ADJUSTING POINTS AND CONNECTING POINTS
BD BOARD SIDE A
BD BOARD SIDE B
– 32 –
SECTION DIAGRAMS
6-1.IC PIN FUNCTION DESCRIPTION
•BD BOARD IC121 CXD2654R
– 33 –
– 34 –
– 35 –
•MAIN BOARD IC100 CXD8607N A/D CONVERTER
– 36 –
– 37 –
– 38 –
– 39 –
MDS-JB920
– 40 –
– 41 –
BLOCK DIAGRAM – SERVO Section –
– 42 –
MDS-JB920
– 43 –
6-3.BLOCK DIAGRAM – MAIN Section –
– 44 –
MDS-JB920
– 46 –
– 45 –
• Circuit Boards Location
Note on Schematic Diagram
– 47 –
6-5.PRINTED WIRING BOARDS – BD Section –
– 48 –
•See page 45 for Circuit Boards Location
– 50 –
– 49 –
MDS-JB920
Page
– 51 –
6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See•
– 52 –
MDS-JB920
– 54 –
– 53 –
MDS-JB920
• Waveforms
– 56 –
– 55 –
MDS-JB920
Page Page Page Page Page Page
– 58 –
– 57 –
MDS-JB920
– 60 –
– 59 –
MDS-JB920
Page Page Page Page
– 62 –
– 61 –
MDS-JB920
MDS-JB920
– 63 –
• Semiconductor Location
MDS-JB920
– 66 –
US, CND
US, CND
– 68 –
– 67 –
MDS-JB920
Page Page Page Page
PRINTED WIRING BOARD – BD SWITCH Section –
6-15.SCHEMATIC DIAGRAM - BD SWITCH Section
– 69 –
– 70 –
IC121
– 71 –
CXD2654R
IC152 BH6511FS-E2
– MAIN Board –
– 72 –
IC100
CXD8607N
IC200
– 73 –
CXD8767N
SN74HC153ANS
IC300
IC700
LA5632
– 75 –
SECTION EXPLODED VIEWS
1 CHASSIS SECTION 56
2 16 17 18
2 FRONT PANEL SECTION 63
– 76 –
59 58
3MECHANISM SECTION MDM-5A
– 77 –
223 207 203 225
206 201
4BASE UNIT SECTION MBU-5A 252
– 78 –
254
AC BAT BD
SECTION ELECTRICAL PARTS LIST
– 79 –
– 80 –
– 81 –
DISP
– 82 –
MAIN
MAIN
MAIN
– 84 –
MAIN
– 85 –
MAIN
– 87 –
SW VOL
Sony Corporation
MDS-JB920
9-922-869-11
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