Servicing Note - Sony D-CJ500 Service Manual

NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

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 30 cm away from the objective lens.

SECTION 1

BEFORE REPLACING THE OPTICAL PICK-UP BLOCK

Please be sure to check thoroughly the parameters as par the "Optical

Pick-Up Block Checking Procedures" (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 yg pin

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

• RF signal P-to-P value: 0.35 to 0.75 Vp-p

LASER DIODE CHECK

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 checking method for the laser diode is operable.

• Method:

Emission of the laser diode is visually checked.

1. Open the upper lid.

2. Push the S801 as shown in Fig. 1.

3. Check the object lens for confirming normal emission of the

laser diode. If not emitting, there is a trouble in the automatic

power control circuit or the optical pick-up. During normal

operation, the laser diode is turned ON about 2.5 seconds for

focus searching.

D-CJ500/CJ501/CJ506CK

S801

Fig. 1 Method to push the S801

3