Sony HCD-GX255, Service Manual

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5
HCD-GX255/RG170/RG470
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
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 emission,
observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveforms is output three times.
•
MODEL IDENTIFICATION
– Back Panel –
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
DISCRIMINATION OF THE MAIN BOARD
There are two types of suffix-11 and suffix-12 of the MAIN boards
used in set as follows.
– MAIN BOARD (Component Side) –
Part Number
AEP, EE, RU models : 1-865-919-12 only
Other models
: 1-865-919-11 or 1-865-919-12