DAV-C770, HCD-C770, HCD-C990 - Sony DVD Service Manual (repair manual). Page 5

5

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.

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.

extension cable
(RF board-DVD board)
(Part No. J-2501-217-A)

extension cable
(DVD board-AMP board)
(Part No. J-8000-024-A)

extension cable
(DVD board-AMP board)
(Part No. J-2501-198-A)

extension cable
(relay board-DVD board)
(Part No. J-2501-143-A)

The disc slot lock function for the antitheft of an demonstration
disc in the store is equipped.

Releasing Procedure:
1. Press two buttons of 

[DISC 1]

 and

x

simultaneously for five

seconds.

2. The message “UNLOCKED” is displayed and the slot is un-

locked.

When “LOCKED” is displayed, the slot lock is not released by
turning power on/off with the 

[POWER]

 button.

Some of the signal of remote commander vary between generation
of player.
Between DAV-S400/S500/S800/C450/C700/C900 and DAV-S550/
S880/C770/C900, remote commander signal codes of
“FUNCTION”, “BAND”, “ST/MONO” and “MEMORY” are
different.
Take notice of the above when you check the operation with remote
commanders of different models.

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 25)
2. Press the 

[2]

 key of the remote commander, and set the “DRIVE

MANUAL OPERATION”. (See page 26)

3. Press the 

[6]

 key of the remote commander, and set the “2-6,

Memory Check”. (See page 28)

4. Press the 

[CLEAR]

 key of the remote commander, and initial-

ize Memory.

When repairing this set, etc., connect the extension cable as the
figure shown below.