DVP-NS3100ES - Sony DVD Service Manual (repair manual). Page 5

5

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.

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.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.

•

Unleaded solder melts at a temperature about 40 ˚C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

•

Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

•

Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

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

Releasing Procedure :
1. Press the

I/

1

button to turn the power on.

2. While pressing the

x

button, press the  

A

button until “TRAY

UNLOCKED” displayed on the FL tube (around 5 seconds).

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

I/

1

button.

When replacing the mounted MAIN board (A-1138-774-A), since
the adjustment value is not set up correctly, “Drive Auto Adjustment”
in the Test Mode can’t be performed.
In this case, initialize memory in the following procedures.

1. Connect a video monitor to VIDEO OUT jack (J502).
2. Press the [TOP MENU], [CLEAR],

I/

1

keys on the remote

commander (RM-ASP002) in this order with standby status
to enter the Test Mode, then “DIAG START” will be displayed
on the fluorescent indicator tube and the Test Mode Menu
screen will be displayed on the video monitor.

3. Press the [2] key on the remote commander to select the “2.

Drive Manual Operation”.

4. Press the [6] key on the remote commander to select the “6.

Memory Check”.

5. Press the [CLEAR] key on the remote commander to initialize

the memory.

Refer to page 12 for detail of the Test Mode

When the MAIN board is replaced by a repair for a fee, throw away
the MAIN board after obtaining consent of not returning of the
MAIN board to the customer. When throwing away the MAIN board,
be sure to throw away after destroying IC253 and IC607 physically
with the hammer etc.