DOWNLOAD Sony HCD-GX255 / HCD-RG170 / HCD-RG470 Service Manual ↓ Size: 2.86 MB | Pages: 32 in PDF or view online for FREE

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Canadian Model

HCD-GX255

AEP Model

E Model

HCD-RG170/RG470

Australian Model

HCD-RG170

HCD-GX255

: CND model

HCD-RG170/RG470 : AEP, EE, RU, E2, E51 models

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Abbreviation
CND : Canadian model
E2

: 120V AC area in E model

E51

: Chilean and Peruvian models

EE

: East European model

RU

: Russian model

In this set, CD mechanism block, MAIN board and HEADPHONE
board have been changed in the midway of production simultaneously.
CD mechanism block, MAIN board and HEADPHONE board of
new type are described in this supplement-1.
Refer to original service manual for other information.
Also, repair after confirming the type by discrimination without
fail, because there is no interchangeability between new type and
former type.

2

........

3

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

4

3-1.

Printed Wiring Board – CD Board – ...............................

6

3-2.

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

7

3-3.

Printed Wiring Board – MAIN Board – ..........................

8

3-4.

Schematic Diagram – MAIN Board (1/3) – ....................

9

3-5.

Schematic Diagram – MAIN Board (2/3) – .................... 10

3-6.

Schematic Diagram – MAIN Board (3/3) – .................... 11

3-7.

Printed Wiring Board – HEADPHONE Board – ............ 12

3-8.

Schematic Diagram – HEADPHONE Board – ............... 12

4-1.

Front Panel Section ......................................................... 21

4-2.

Chassis Section ................................................................ 22

4-3.

CD Mechanism Deck Section-1
(CDM74KFS-K6BD83S) ................................................ 23

4-4.

CD Mechanism Deck Section-2
(CDM74KFS-K6BD83S) ................................................ 24

................................ 25

3

New/former type can be distinguished in the version display mode
of the test mode.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press three buttons of

x

, [ILLUMINATION] and [DISC 2]

simultaneously.

3. When this mode is activated, model and destination is displayed

on the fluorescent indicator tube.

4. Press the [DISPLAY] button to display software version and

year, month, day of the software creation display mode.

Former type : G01.08A:050225
New type

: G02.03A:050707

5. To release this mode, press three buttons of

x

, [ILLUMI

NATION] and [DISC 2] simultaneously.

4

+
–

CD board

TP (RFACI)
TP (VC)

oscilloscope

(DC range)

1. Connect oscilloscope to TP (RFACI) and TP (VC) on the CD

board.

2. Press the

I/

1 button to turn the power ON, and press

the Z button to open the CD disc table.

3. Set disc (YEDS-18) on the tray and press the N button to

playback.

4. Confirm that oscilloscope waveform is as shown in the figure

below. (eye pattern)

A good eye pattern means that the diamond shape (

◊

) in the

center of the waveform can be clearly distinguished.

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level:
0.9 

±

 0.4 Vp-p

TP

(VC)

TP

(RFACI)

IC201

1.

CD Block is basically constructed to operate without adjustment.

2.

Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.

Use an oscilloscope with more than 10 M

Ω

 impedance.

4.

Clean the object lens by an applicator with neutral detergent when the

signal level is low than specified value with the following checks.

5.

Check the focus bias check when optical pick-up block is replaced.