Sony HCD-CBX1 - Compact Disc Receiver, Service Manual

3

HCD-BX5BT/CBX1/CBX3

SAFETY  CHECK-OUT

After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE  TEST

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable.  (See
Fig. A)

Fig. A.

Using an AC voltmeter to check AC leakage.

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

TABLE  OF  CONTENTS

1.

SERVICING  NOTES

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

4

2.

GENERAL

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

6

3.

DISASSEMBLY

3-1.

Disassembly Flow ........................................................... 10

3-2.

Panel (Side L/R) .............................................................. 11

3-3.

Panel (Top) ...................................................................... 11

3-4.

MAIN Board, Shield Plate (PWB MAIN) ...................... 12

3-5.

BT Board (BX5BT only) ................................................. 13

3-6.

Lid (CD) Assy ................................................................. 13

3-7.

Panel (Front) Assy ........................................................... 14

3-8.

D.C. Fan (M301), Panel (Rear) ....................................... 14

3-9.

POWER Transformer (T1) .............................................. 15

3-10. Loading Mechanism Block ............................................. 15
3-11. Base Unit ......................................................................... 16
3-12. Belt .................................................................................. 16
3-13. OP Base Assy (KSM-213D) ............................................ 17

4.

TEST  MODE

.............................................................. 18

5.

ELECTRICAL  CHECKS

........................................ 20

6.

DIAGRAMS

6-1.

Block Diagram – CD SERVO Section – ......................... 21

6-2.

Block Diagram
– TUNER, USB, BLUETOOTH Section – ..................... 22

6-3.

Block Diagram – MAIN Section – .................................. 23

6-4.

Block Diagram
– PANEL, POWER SUPPLY Section – .......................... 24

6-5.

Printed Wiring Boards – CD Section – ........................... 26

6-6.

Schematic Diagram – CD Board – .................................. 27

6-7.

Printed Wiring Board – USB Board (CBX3) – ............... 28

6-8.

Schematic Diagram – USB Board (CBX3) – .................. 29

6-9.

Printed Wiring Boards
– BLUETOOTH Section (BX5BT) – .............................. 30

6-10. Schematic Diagram

– BLUETOOTH Section (BX5BT) – .............................. 31

6-11. Printed Wiring Boards – REGULATOR Section – ......... 32
6-12. Schematic Diagram – REGULATOR Section – .............. 32
6-13. Printed Wiring Board – MAIN Board – .......................... 33
6-14. Schematic Diagram – MAIN Section (1/4) – .................. 34
6-15. Schematic Diagram – MAIN Section (2/4) – .................. 35
6-16. Schematic Diagram – MAIN Section (3/4) – .................. 36
6-17. Schematic Diagram – MAIN Section (4/4) – .................. 37
6-18. Printed Wiring Board – AMP Board – ............................ 38
6-19. Schematic Diagram – AMP Board – ............................... 39
6-20. Printed Wiring Boards – SPEAKER Section – ............... 40
6-21. Schematic Diagram – SPEAKER Section – .................... 41
6-22. Printed Wiring Boards – PANEL Section – ..................... 42
6-23. Schematic Diagram – PANEL Section – ......................... 43
6-24. Printed Wiring Board – POWER Board – ....................... 44
6-25. Schematic Diagram – POWER Board – .......................... 45

7.

EXPLODED  VIEWS

7-1.

Panel Section ................................................................... 56

7-2.

Front Panel Section ......................................................... 57

7-3.

Main Section .................................................................... 58

7-4.

POWER Board Section ................................................... 59

7-5.

Loading Mechanism Section ........................................... 60

7-6.

Base Unit Section
(BU-K6BD90-WOD: BX5BT/CBX1)
(BU-K6BD90U-WOD: CBX3) ....................................... 61

8.

ELECTRICAL  PARTS  LIST

................................ 62