Servicing Notes - Sony HCD-GN660 Service Manual

HCD-GN660/GN770/GX9000
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 waveform is output several times.
4
SECTION 1

SERVICING NOTES

• MODEL IDENTIFICATION
– Back Panel –
GN770: E2, E3models
GX9000
GN770: AUS model
GN770: E51 model
GN770: Mexican model
GN660: E2, E3models
GN770: E51 model
GN770: Mexican model
GN660: AR model
• Abbreviation
E2
E3
E51 : Chilean and Peruvian model
AUS : Australian model
AR : Argentine model
PART No.
MODEL
: 120 V AC Area in E model
: 240 V AC Area in E model
PART No.
4-252-722-0[]
4-252-722-1[]
4-252-722-2[]
4-252-722-3[]
4-252-722-4[]
4-252-555-0[]
4-252-555-1[]
4-252-555-2[]
4-252-555-3[]