Is the disc initialized?
1
b/
Does the laser diode go on?
7
Yes
/
A Check the item of “The laser diode goes on.”
!
4
B Check the item of “The laser diode does not
go
on.”
1
Does the tracking servo operate normally?
Is the EFM signal of pin 36 of
IC2
flat? (Lower side)
Yes
Normal
/
Is there any dropout part in the EFM siqnal of pin 36 of
,
IC2?
-
Yes
Replace the disc or change the program.
Is the tracking error signal (pin 2 of IC2) being output?
____*
No
No+m
Is the tracking signal being output
I
I
I
from the
oickuo
main unit?
I
I
,
I
/
Yes
Yes
*
rF$lace
the
1
In the stop mode, is the tracking coil drive output (pin 4 of
‘7
Incorrect adjustment
1
CNPP)
0 SOmV?
In the stop mode, adjust the tracking offset to 0
‘I
50mV.
/
j
Yes
Is the tracking coil drive output being output from the
tracking driver output (pin 2 of
IC4)?
I
Yes
-
IC4
is defective.
i
NO
The PWB negative pattern is damaged.
The pickup connecting connector is broken.
The pickup tracking coil is broken.
. ,
-24-
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