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2-A
Note : Open the CD door and set the door switch for "on" position. Check the radiation power with
an optical power meter or by watching the radiation through the lens or the pickup unit at a
minimum distance of 30cmfrpm the from pickup.
>1.5 V
RFO-Vref
Figure 8
>1.5 V
RFO-Vref
Figure 9
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A
Does the Laser emit?
Yes
Does the lens
move up and down?
Yes
Load a disc and close the CD door.
Then check the following.
Is the waveform
at pin 1 FO IC902 like that shown
in figure 8?
Yes
Is the
waveform at pin
35 (FEO) of IC902 like that
shown
in figure 9?
Yes
Check circuit around IC901, IC902 and
IC903.
No
A1
(See page11)
No
A2
(See page12)
No
No
— 10 —
Check wire connector from
pickup.
Check circuit around pins
1~5 and 46~48 of IC902.
Check circuit around
pins 30~42 of IC902.
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