D-EJ2000
SECTION 1
SERVICING NOTE
BEFORE REPLACING THE OPTICAL PICK-UP BLOCK
Please be sure to check thoroughly the parameters as par the OOpticalNOTES ON HANDLING THE OPTICAL PICK-UP
Pick-Up Block Checking Procedures� (Part No.: 9-960-027-11)BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostaticissued separately before replacing the optical pick-up block.
breakdown because of the potential difference generated by theNote and specifications required to check are given below.
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also useY FOK output: IC601 yg pin
the procedure in the printed matter which is included in the repairWhen checking FOK, remove the lead wire to disc motor.
parts.Y RF signal P-to-P value: 0.34 to 0.74 Vp-p
The flexible board is easily damaged and should be handled with
care.LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
During normal operation of the equipment, emission of the laser
NOTES ON LASER DIODE EMISSION CHECKdiode is prohibited unless the upper lid is closed while turning ON
The laser beam on this model is concentrated so as to be focused onthe S804. (push switch type)
the disc reflective surface by the objective lens in the optical pick-The following checking method for the laser diode is operable.
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
Y Method:
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. With a disc not set, turn on the S804 with a screwdriver having a
thin tip as shown in Fig.1.
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 4
times along with inward motion for the focus search.
detection lever
detection lever
S804
MAIN board
Fig. 1 Method to push the S804
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ACEC
