Sony CDX-848X - Compact Disc Changer System, Service Manual

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3
CDX-848X
TABLE OF CONTENTS
SERVICING NOTES
.......................................................... 2
1. GENERAL
Installation ....................................................................... 5
Connections ..................................................................... 6
2. DISASSEMBLY
2-1. Disassembly Flow ........................................................... 7
2-2. Case (Upper T), Front Panel Assy .................................. 8
2-3. Mechanism Deck (MG-251B-137) ................................. 8
2-4. JACK Board, DIGITAL OUT Board .............................. 9
2-5. MAIN Board, Slide Variable Resistor
(Elevator Height Sensor) (RV202) ................................. 9
2-6. ELJ Motor Assy (Elevator) (M104) ................................ 10
2-7. Escutcheon (T) ................................................................ 10
2-8. Chassis (U.S) Sub Assy .................................................. 11
2-9. Chassis Assy .................................................................... 11
2-10. RF Board ......................................................................... 12
2-11. Sled Motor Assy (251) (M101),
Optical Pick-up (KSS-720A) .......................................... 12
2-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 13
2-13. ELJ Motor Assy (Chucking) (M103) ............................. 13
3. MECHANISM DECK ASSEMBLY
3-1. Assembly Flow ................................................................ 14
3-2. Optical Pick-up Complete Assy ...................................... 14
3-3. Gear (Lomini)/(Load Cam) Assy .................................... 15
3-4. Operation Check ............................................................. 15
4. MECHANICAL ADJUSTMENT
.......................... 16
5. ELECTRICAL CHECK
.......................................... 17
6. DIAGRAMS
6-1. Block Diagram – SERVO Section – .............................. 19
6-2. Block Diagram – BUS CONTROL/
POWER SUPPLY Section – ........................................... 20
6-3. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 21
6-4. Printed Wiring Boards – RF/LSW Boards – ................. 22
6-5. Schematic Diagram – RF/LSW Boards – ...................... 23
6-6. Printed Wiring Boards
– MAIN Board (Component Side) – .............................. 24
6-7. Printed Wiring Boards
– MAIN (Conductor Side)/SWITCH Boards – .............. 25
6-8. Schematic Diagram – MAIN Board (1/3) – .................. 26
6-9. Schematic Diagram – MAIN Board (2/3) – .................. 27
6-10. Schematic Diagram
– MAIN (3/3)/SWITCH Boards – ................................. 28
6-11. Printed Wiring Boards
– JACK/DIGITAL OUT Boards – ................................. 29
6-12. Schematic Diagram
– JACK/DIGITAL OUT Boards – .................................. 29
6-13. IC Pin Function Description ........................................... 34
7. EXPLODED VIEWS
7-1. Case Section .................................................................... 37
7-2. Mechanism Deck Section-1 (MG-251B-137) ................ 38
7-3. Mechanism Deck Section-2 (MG-251B-137) ................ 39
7-4. Mechanism Deck Section-3 (MG-251B-137) ................ 40
7-5. Mechanism Deck Section-4 (MG-251B-137) ................ 41
8. ELECTRICAL PARTS LIST
............................... 42
NOTE FOR REPLACING IC201
IC201 on MAIN board for this set has been changed in the mid-
way of manufacturing.
In a set that the former type of IC201 is mounted, SUB board is
connected to MAIN board (conductor side).
No service parts are supplied for the former type of IC201 and
SUB board.
When the former type of IC201 is replaced, remove SUB board
and replace the former type of IC201 with the new type.
CHECKING QUALITY OF SUB BOARD
If the set works normally after SUB board is removed from MAIN
board, SUB board has a trouble.
IN this case, remove SUB board and replace IC201 now in use
with the new type of IC201.
– MAIN BOARD (Component Side) –
– MAIN BOARD (Conductor Side) –
New Type
MB90473PFV-G-110-
BNDE1
Former Type
MB90473PFV-G-108-
BNDE1
MAIN
BOARD
IC201
SUB
BOARD
IC201
Ver 1.1 2001.05
SUB BOARD