Sony Sports D-FS18, Service Manual

3

D-FS18

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the charged
electrostatic load, etc. on clothing and the human body. During repair, pay
attention to electrostatic breakdown 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 30cm away
from the objective lens.

Before Replacing the Optical pick-up Block

Please be sure to check thoroughly the parameters as per the “Optical pick-
up Block Checking Procedure” (Part No. : 9-960-027-11) issued separately
before replacing the optical Pick-up block.
Note and specifications required to check are given below.

•  FOK output : IC601 

eg

 pin

When checking FOK, remove the lead wire to disc motor.

•  RF signal P-to-P value : 0.4 to 0.5Vp-p

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR
BASE UNIT

Fig.1 Method to push S801

MAIN board

S801

Precautions for Checking Emission of Laser Diode

Laser light of the equipment is focused by the object lens in the optical
pick-up so that the light focuses on the reflection surface of the disc.
Therefore, be sure to keep your eyes more then 30 cm apart from the object
lens when you check the emission of laser diode.

Laser Diode Checking Methods

During normal operation of the equipment, emission of the laser diode is
prohibited unless the upper lid is closed while turning ON the S801. (push
switch type)
The following two checking methods for the laser diode are oper-able.

• Method:

Emission of the laser diode is visually checked.

1. Open the upper lid.
2. With a disc not set, turn on the S801 with a screwdriver having a thin tip

as shown in Fig.1.

Note:

Do not push the detection lever strongly, or it may be bent or dam-
aged.

3. Press the 

 u

  button.

4. Observing the objective lens, check that the laser diode emits light.

When the laser diode does not emit light, automatic power control circuit
or optical pickup is faulty.
In this operation, the objective lens will move up and down 5 times along
with inward motion for the focus search.