CDX-C8050X - Sony Car Audio Service Manual (repair manual). Page 2

2

Location of controls ................................................................. 3
Getting Started ......................................................................... 3
Setting the clock ...................................................................... 3
CD/MD .................................................................................... 4
Radio ....................................................................................... 5
DSP .......................................................................................... 6
Other Functions ....................................................................... 7
TV/Video ................................................................................. 8
Additional Information ............................................................ 9
Connections ........................................................................... 10

2-1.   Sub Panel Assy .................................................................. 12
2-2.   CD Mechanism Block ....................................................... 12
2-3.   Main Board ....................................................................... 13
2-4.   Heat Sink ........................................................................... 13
2-5.   Chassis (T) Assy ................................................................ 14
2-6.   Lever Assy ......................................................................... 14
2-7.   Servo Board ....................................................................... 15
2-8.   ARM Roller Assy .............................................................. 15
2-9.   Chassis (OP) Assy ............................................................. 16
2-10. Optical Pick-up Block ....................................................... 16

3-1.   IC Pin Descriptions ........................................................... 17
3-2.   Block Diagram –CD Section– ........................................... 26
3-3.   Block Diagram –Tuner Section– ....................................... 27
3-4.   Block Diagram –Display Section– .................................... 28
3-5.   Circuit Boards Location .................................................... 29
3-6.   Printed Wiring Boards –CD Mechanism Section– ............ 30
3-7.   Schematic Diagram –CD Mechanism Section (1/2)– ....... 32
3-8.   Schematic Diagram –CD Mechanism Section (2/2)– ....... 33
3-9.   Printed Wiring Board –Main Section– .............................. 34
3-10. Schematic Diagram –Main Section (1/4)– ........................ 36
3-11. Schematic Diagram –Main Section (2/4)– ........................ 37
3-12. Schematic Diagram –Main Section (3/4)– ........................ 38
3-13. Schematic Diagram –Main Section (4/4)– ........................ 39
3-14. Printed Wiring Board –DSO Section– .............................. 40
3-15. Schematic Diagram –DSO Section– ................................. 41
3-16. Printed Wiring Board –Sub (CD) Section– ....................... 42
3-17. Schematic Diagram –Sub (CD) Section– .......................... 43
3-18. Printed Wiring Board –Key Section– ................................ 44
3-19. Schematic Diagram –Key Section– .................................. 45

4-1.   Chassis Section ................................................................. 48
4-2.   Front Panel Section ........................................................... 49
4-3.   CD Mechanism Section (1) ............................................... 50
4-4.   CD Mechanism Section (2) ............................................... 51
4-5.   CD Mechanism Section (3) ............................................... 52

........................................ 53

COMPONENTS  IDENTIFIED  BY  MARK  0  OR  DOTTED  LINE
WITH  MARK  0  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.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
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.

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.

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.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.