HCD-GX255, HCD-RG170, HCD-RG470, MHC-GX255, MHC-RG170, MHC-RG470 - Sony Audio Service Manual (repair manual). Page 5

5

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 waveforms is output three times.

•

Label indication

Model

2-560-990-01

GX255

2-560-991-01

RG170: AEP, EE, RU

2-560-993-01

RG470: E2, E3

2-560-994-01

RG170: EA

2-560-996-01

RG170: AUS

2-560-997-01

RG170: E51

2-560-998-01

RG170: AR

2-580-000-01

RG470: AEP, EE, RU

2-580-001-01

RG470: E2

2-580-002-01

RG470: E51

2-580-003-01

RG470: MX

2-580-004-01

RG470: AR

•

Abbreviation
AR

: Argentina model

AUS

: Australian model

CND

: Canadian model

E2

: 120V AC Area in E model

E3

: 240V AC Area in E model

E51

: Chilean and Peruvian models

EA

: Saudi Arabia model

EE

: East European model

MX

: Mexican model

RU

: Russian model

Model number label

There are two types of suffix-11 and suffix-12 of the MAIN boards
used in set as follows.

Part Number
AEP, EE, RU models : 1-865-919-12 only
Other models

: 1-865-919-11 or 1-865-919-12