Read Sony ICF-CD855 / ICF-CD855L Service Manual online
3
ICF-CD855/CD855L
TABLE OF CONTENTS
1.
SERVICING NOTES
..............................................
3
2.
GENERAL
..................................................................
4
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
5
3-2. Cabinet (Rear) Block ......................................................
5
3-3. Cabinet (Upper) Block ....................................................
6
3-4. CD Board .........................................................................
6
3-5. Optical Pick-up Block (KSM-900AAA) ........................
7
3-6. Optical Pick-up (KSS-900A) ..........................................
7
3-7. MAIN Board ...................................................................
8
3-8. Speaker (SP101/SP201) ..................................................
9
3-9. CD Lid Block ..................................................................
9
4.
TEST MODE
.............................................................. 10
5.
ELECTRICAL ADJUSTMENTS
........................ 13
6.
DIAGRAMS
6-1. Block Diagram – CD Section – .................................... 16
6-2. Block Diagram – TUNER Section – ............................ 17
6-3. Block Diagram – MAIN Section – ............................... 18
6-4. Note for Printed Wiring Boards and
6-2. Block Diagram – TUNER Section – ............................ 17
6-3. Block Diagram – MAIN Section – ............................... 18
6-4. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 19
6-5. Printed Wiring Board – CD Section – ......................... 20
6-6. Schematic Diagram – CD Section – ............................. 21
6-7. Printed Wiring Board
6-6. Schematic Diagram – CD Section – ............................. 21
6-7. Printed Wiring Board
– TUNER Section (ICF-CD855) – ................................ 22
6-8. Schematic Diagram
– TUNER Section (ICF-CD855) – ................................ 23
6-9. Printed Wiring Board
– TUNER Section (ICF-CD855L) – .............................. 24
6-10. Schematic Diagram
– TUNER Section (ICF-CD855L) – .............................. 25
6-11. Printed Wiring Boards – PANEL Section – ................. 26
6-12. Printed Wiring Boards – MAIN Section – ................... 27
6-13. Schematic Diagram – MAIN Section (1/2) – ............... 28
6-14. Schematic Diagram – MAIN Section (2/2) – ............... 29
6-12. Printed Wiring Boards – MAIN Section – ................... 27
6-13. Schematic Diagram – MAIN Section (1/2) – ............... 28
6-14. Schematic Diagram – MAIN Section (2/2) – ............... 29
7.
EXPLODED VIEWS
7-1. Overall Section ................................................................ 35
7-2. Cabinet (Rear) Block Section ......................................... 36
7-3. CD Lid Section ................................................................ 37
7-4. LCD Section .................................................................... 38
7-5. Cabinet (Upper) Section ................................................. 39
7-6. KEY Board Section ......................................................... 40
7-7. Cabinet (Lower) Block Section ...................................... 41
7-8. Speaker Section ............................................................... 42
7-9. Optical Pick-up Section (KSM-900AAA) ..................... 43
7-2. Cabinet (Rear) Block Section ......................................... 36
7-3. CD Lid Section ................................................................ 37
7-4. LCD Section .................................................................... 38
7-5. Cabinet (Upper) Section ................................................. 39
7-6. KEY Board Section ......................................................... 40
7-7. Cabinet (Lower) Block Section ...................................... 41
7-8. Speaker Section ............................................................... 42
7-9. Optical Pick-up Section (KSM-900AAA) ..................... 43
8.
ELECTRICAL PARTS LIST
.............................. 44
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down 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.
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down 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 emis-
sion, observe from more than 30 cm away from the objective lens.
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
• In performing the repair with the power supplied to the set, re-
moving the MAIN board causes the set to be disabled.
In such a case, short between 1 and 2 pins of the W604 on the
MAIN board using a lead wire.
In such a case, short between 1 and 2 pins of the W604 on the
MAIN board using a lead wire.
2 1
– MAIN Board (Conductor Side) –
W604
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