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• NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.
• To Check the Laser Diode and Focus Search Operation
Open the upper panel. Turn on the power without a disc while
the main board S801 (OPEN) is ON (or TAP802 is shorted). Then,
observe the objective lens and check that the following opera-
tions are performed.
1. Scatterd light of laser beams is seen.
2. Check for vertical movements (five) of the objective lens (with
movement of the PU on the inner circumference).
– main board (side A) –
S801
S801
(OPEN)
• Before Replacing the Optical Pick-Up Block
Please be sure to check throughly the parameters as par the "Opti-
cal 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 #∞ pin
When checking FOK, remove the lead wire to disc motor.
When checking FOK value, remove the lead wire to
disc motor.
• RF signal P-to-P value : 0.35 - 0.65 Vp-p
• The repairing grating holder is impossible.
SECTION 1
SERVICE NOTE
• CHUCK PLATE JIG ON REPAIRING
TAP802
– 3 –
On repairing CD section, playing a disc without the upper panel
section, use Chuck Plate Jig.
• Part No. of Chuck Plate Jig: 4-221-965-01
chuck plate jig
disc
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