Sony AVD-S50, Service Manual

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5
AVD-S50/S50ES
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 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.
Ver 1.4
DISC TRAY LOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Releasing Procedure:
1. Press two buttons of
[FUNCTION ]
and
[ PREV]
simultaneously.
2. The message “UNLOCKED” is displayed and the tray is
unlocked.
Note: When “LOCKED” is displayed, the tray lock is not released
by turning power on/off with the
[POWER]
button.
.
–
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “DVD section adjustment” and
check that the S curve waveforms is output three times.
NOTE OF REPLACING THE DVD BOARD
When replacing the DVD board, since the adjustment value is not
set up correctly, “Drive Auto Adjustment” can’t be performed.
In this case, initialize Memory in the following procedures.
Procedure:
1. Set the test mode. (See page 15)
2. Press the
[2] key of the remote commander, and set the “DRIVE
MANUAL OPERATION”. (See page 17)
3. Press the
[6]
key of the remote commander, and set the “2-6,
Memory Check”. (See page 19)
4. Press the
[CLEAR]
key of the remote commander, and initialize
Memory.