Servicing Notes - Sony HCD-GN77D Service Manual

HCD-GN77D
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NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, 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.
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SECTION 1

SERVICING NOTES

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• MODEL IDENTIFICATION
– Back Panel –
PART No.
MODEL
SP model
MY model
EA model
TH model
Q Q
E3, E15 models
3 6 7 1 3 1 5
• Abbreviation
E3 : 240 V AC Area in E model
EA : Saudi Arabia model
E15 : Iran model
SP : Singapore model
MY : Malaysia model
TH : Thai model
DVD TRAY LOCK MODE
• This mode let you lock the disc trays. When this mode is acti-
vated, the disc tray will not open when
[DISC SKIP/EX-CHANGE]
ton or
sage "LOCKED" will be displayed in the will be displayed on
the fluorescent indicator tube.
Procedure:
1. Press button to turn the set ON.
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2. Select DVD function.
3. Press button and
x
Z
OPEN/CLOSE
and hold down until "LOCKED" or "UNLOCKED" displayed
on the fluorescent indicator tube (around 5 seconds).
co
.
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PART No.
4-246-185-1[]
4-246-185-2[]
4-246-185-3[]
4-246-185-4[]
4-246-185-5[]
0 5 8 2 9 9 4 2 8
but-
Z
OPEN/CLOSE
button is pressed. The mes-
button simultaneously
m
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