HCD-BC150, HCD-BC250 - Sony Audio Service Manual (repair manual)

US Model

Canadian Model

New type models start with the following serial numbers.

MODEL

Initial Serial No.

DAV-BC150

US

8390001

Canadian

4310001

DAV-BC250

US

8310001

Canadian

4310001

2

...................................................

3

2-1.

Disassembly Flow ...........................................................

6

2-2.

Case, Front Panel Assy Section .......................................

7

2-3.

PANEL Board, FL Board, H/P Board,
POWER SW Board .........................................................

8

2-4.

Switching Regulator ........................................................

8

2-5.

AMP Board ......................................................................

9

2-6.

DMB09 Board .................................................................

9

2-7.

SPK Board, IO Board, DC Fan ....................................... 10

2-8.

MAIN Board .................................................................... 10

2-9.

LF Board .......................................................................... 11

2-10. MD Rear Cover ............................................................... 11
2-11. DVD Mechanism Deck (CDM81C-DVBU100) ............. 12
2-12. Tray .................................................................................. 13
2-13. MOTOR Board, M761 (LD/SD Motor),

M762 (BU U/D Motor) ................................................... 13

2-14. Base Unit (DVBU100) .................................................... 14
2-15. Optical Pick-up (KHM-310AAB/C2NP) ........................ 14

............................................................... 15

............................. 19

5-1.

Block Diagram  – RF/SERVO Section – ......................... 22
– VIDEO Section – .......................................................... 23
– AMP Section – .............................................................. 24
– AUDIO Section – .......................................................... 25
– POWER Section – ........................................................ 26

5-2.

Printed Wiring Board – DVD Mechanism Section – ...... 27

5-3.

Schematic Diagram  – DVD Mechanism Section – ........ 28

5-4.

Printed Wiring Board  – DMB09 Section (Side A) – ...... 29

5-5.

Printed Wiring Board  – DMB09 Section (Side B) – ...... 30

5-6.

Schematic Diagram  – DMB09 Section (1/4) – .............. 31

5-7.

Schematic Diagram  – DMB09 Section (2/4) – .............. 32

5-8.

Schematic Diagram  – DMB09 Section (3/4) – .............. 33

5-9.

Schematic Diagram  – DMB09 Section (4/4) – .............. 34

5-10. Printed Wiring Board – MAIN Section (Side A) – ......... 35
5-11. Printed Wiring Board – MAIN Section (Side B) – ......... 36
5-12. Schematic Diagram  – MAIN Section (1/3) – ................. 37
5-13. Schematic Diagram  – MAIN Section (2/3) – ................. 38
5-14. Schematic Diagram  – MAIN Section (3/3) – ................. 39
5-15. Printed Wiring Board – PANEL/FL/POWER SW/

H/P/AMP RETAINER Section – ..................................... 40

5-16. Schematic Diagram  – PANEL/FL/POWER SW/

H/P/AMP RETAINER Section – ..................................... 41

5-17. Printed Wiring Board – IO Section – .............................. 42
5-18. Schematic Diagram  – IO Section – ................................ 43
5-19. Printed Wiring Board  – AMP Section (Side A) – ........... 44
5-20. Printed Wiring Board  – AMP Section (Side B) – ........... 45
5-21. Schematic Diagram  – AMP Section (1/4) – ................... 46
5-22. Schematic Diagram  – AMP Section (2/4) – ................... 47
5-23. Schematic Diagram  – AMP Section (3/4) – ................... 48
5-24. Schematic Diagram  – AMP Section (4/4) – ................... 49
5-25. Printed Wiring Board  – SPK/LF Section – .................... 50
5-26. Schematic Diagram  – SPK/LF Section – ....................... 50

6-1.

Overall Section ................................................................ 70

6-2.

Front Panel Section ......................................................... 71

6-3.

Chassis Section ................................................................ 72

6-4.

DVD Mechanism Deck Section-1
(CDM81C-DVBU100) .................................................... 73

6-5.

DVD Mechanism Deck Section-2
(CDM81C-DVBU100) .................................................... 74

6-6.

DVD Mechanism Deck Section-3
(CDM81C-DVBU100) .................................................... 75

6-7.

Base Unit Section (DVBU100) ....................................... 76

.................................. 77

3

The laser diode in the optical pick-up block may suffer electrostatic
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.

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,
observe from more than 30 cm away from the objective lens.

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output several times.

The disc slot lock function for the antitheft of an demonstration
disc in the store is equipped.

1. Press the  ?/1  button to turn the set on.
2. Press the [FUNCTION] button to set DVD function.
3. Insert a disc.
4. Press the  

x  

stick and the  

Z 

 (DISC1) button simultaneously

for five seconds.

5. The message “LOCKED” is displayed and the slot is locked.

1. Press the 

x 

stick and the  

Z 

(DISC1) button simultaneously

for five seconds again.

2. The message “UNLOCKED” is displayed and the slot is

unlocked.

When “LOCKED” is displayed, the slot lock is not released by
turning power on/off with the  ?/1  button.

Regarding the notification symbol “R”
Because the number of the operating buttons of this product
are limited, some operations require use of the operating
buttons of the remote commander (RM-SS250 supplied with
the product). When a specific operation requires use of the
operating buttons of the remote commander (RM-SS250), “R”
is added to the specific operating procedure in this manual.
Example  MENU/NO  “R”  The  MENU/NO  button  of remote
commander.

Incorrect operations may be performed if the test mode ia not
entered properly.
In this case, press the  ?/1  button to turn the power off, and
retry to enter the test mode.

If the disc tray does not open and the message “LOCKED”
appears, press the  x tick and the  Z  (DISC1) button

simultaneously for 5 seconds or longer.

Then remove your fingers from the above stick and the button.
The message “UNLOCKED” appears for 2 seconds and the disc
tray opens.

1mm/21P/L300 (J-2501-244-A) 

DVD mechanism deck
(CDM81C-DVBU100)

1mm/28P/L300 (J-2501-249-A) 

4

DMB09 board

AMP board