Read Sony CDX-C7850R Service Manual online
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TABLE OF CONTENTS
1. GENERAL
Location of controls ................................................................. 3
Getting Started ......................................................................... 3
CD Player ................................................................................ 4
Radio ....................................................................................... 5
RDS ......................................................................................... 5
Setting the clock automatically ............................................... 7
Other Functions ....................................................................... 7
CD/MD Unit ............................................................................ 8
Connections ........................................................................... 10
Getting Started ......................................................................... 3
CD Player ................................................................................ 4
Radio ....................................................................................... 5
RDS ......................................................................................... 5
Setting the clock automatically ............................................... 7
Other Functions ....................................................................... 7
CD/MD Unit ............................................................................ 8
Connections ........................................................................... 10
2. DISASSEMBLY
2-1. Cover ................................................................................. 13
2-2. Front Panel Assy ............................................................... 13
2-3. Sub Panel Assy .................................................................. 14
2-4. Mechanism Block ............................................................. 14
2-5. Main Board ....................................................................... 15
2-6. Heat Sink ........................................................................... 15
2-7. Chassis (T) Sub Assy ........................................................ 16
2-8. Lever Assy ......................................................................... 16
2-9. Servo Board ....................................................................... 17
2-10. Roller Assy ........................................................................ 17
2-11. Chassis (OP) (O/S) Assy ................................................... 18
2-12. Optical Pick-up Block ....................................................... 18
2-2. Front Panel Assy ............................................................... 13
2-3. Sub Panel Assy .................................................................. 14
2-4. Mechanism Block ............................................................. 14
2-5. Main Board ....................................................................... 15
2-6. Heat Sink ........................................................................... 15
2-7. Chassis (T) Sub Assy ........................................................ 16
2-8. Lever Assy ......................................................................... 16
2-9. Servo Board ....................................................................... 17
2-10. Roller Assy ........................................................................ 17
2-11. Chassis (OP) (O/S) Assy ................................................... 18
2-12. Optical Pick-up Block ....................................................... 18
3. ELECTRICAL ADJUSTMENTS
Tuner Section ......................................................................... 19
4. DIAGRAMS
4-1. IC Pin Descriptions ........................................................... 23
4-2. Block Diagram –CD Section– ........................................... 31
4-3. Block Diagram –Display Section– .................................... 33
4-4. Block Diagram –Tuner Section– ....................................... 35
4-5. Circuit Boards Location .................................................... 37
4-6. Schematic Diagram –CD Mechanism Section (1/3)– ....... 39
4-7. Schematic Diagram –CD Mechanism Section (2/3)– ....... 41
4-8. Schematic Diagram –CD Mechanism Section (3/3)– ....... 43
4-9. Printed Wiring Boards –CD Mechanism Section– ............ 46
4-10. Printed Wiring Board –Main Section– .............................. 49
4-11. Schematic Diagram –Main Section (1/4)– ........................ 53
4-12. Schematic Diagram –Main Section (2/4)– ........................ 55
4-13. Schematic Diagram –Main Section (3/4)– ........................ 57
4-14. Schematic Diagram –Main Section (4/4)– ........................ 59
4-15. Printed Wiring Board –Display Section– .......................... 61
4-16. Schematic Diagram –Display Section– ............................. 63
4-17. Printed Wiring Board –Relay Section– ............................. 65
4-18. Schematic Diagram –Relay Section– ................................ 67
4-2. Block Diagram –CD Section– ........................................... 31
4-3. Block Diagram –Display Section– .................................... 33
4-4. Block Diagram –Tuner Section– ....................................... 35
4-5. Circuit Boards Location .................................................... 37
4-6. Schematic Diagram –CD Mechanism Section (1/3)– ....... 39
4-7. Schematic Diagram –CD Mechanism Section (2/3)– ....... 41
4-8. Schematic Diagram –CD Mechanism Section (3/3)– ....... 43
4-9. Printed Wiring Boards –CD Mechanism Section– ............ 46
4-10. Printed Wiring Board –Main Section– .............................. 49
4-11. Schematic Diagram –Main Section (1/4)– ........................ 53
4-12. Schematic Diagram –Main Section (2/4)– ........................ 55
4-13. Schematic Diagram –Main Section (3/4)– ........................ 57
4-14. Schematic Diagram –Main Section (4/4)– ........................ 59
4-15. Printed Wiring Board –Display Section– .......................... 61
4-16. Schematic Diagram –Display Section– ............................. 63
4-17. Printed Wiring Board –Relay Section– ............................. 65
4-18. Schematic Diagram –Relay Section– ................................ 67
5. EXPLODED VIEWS
5-1. Chassis Section ................................................................. 73
5-2. Front Panel Section ........................................................... 74
5-3. CD Mechanism Section (1) ............................................... 75
5-4. CD Mechanism Section (2) ............................................... 76
5-5. CD Mechanism Section (3) ............................................... 77
5-2. Front Panel Section ........................................................... 74
5-3. CD Mechanism Section (1) ............................................... 75
5-4. CD Mechanism Section (2) ............................................... 76
5-5. CD Mechanism Section (3) ............................................... 77
6. ELECTRICAL PARTS LIST
........................................ 78
SAFETY-RELATED COMPONENT WARNING!!
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.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
SERVICE NOTE
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
dures other than those specified herein may result in haz-
ardous radiation exposure.
Notes on Chip Component Replacement
•
Never reuse a disconnected chip component.
•
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
aged by heat.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
NOTES ON PICK-UP FLEXIBLE BOARD
The pick-up flexible board in this set is secured to the optical pick-
up with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-
up flexible board with a new one.
up with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-
up flexible board with a new one.
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