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Check the item of " The spin motor' s CLV servo is defective" .
Is the output of pin 3 (HF) ,; TP751
flat I" test mode 4?
When the pickup moves to a track
using the UP/DOWN button in test
mode 5, is there audio output?
Is the pickup returned to the inner
The pickup in swatch is defective (ON)
Check the item of " Track searching is impossible" .
Does the disc play back several ten
Check the item of " The slide servo does not function" .
seconds even after starling playback?
Check the PWB p&rns from pin 1 of CNP881 to CNP852.
- P W B p a t t e r n s f r o m p i n 1 o f C N P 8 . 3 1 t o p i n 24(Vcc) of IC750.1
T
If 0340 iS not short-circuited, IC750 1s defective.
C
h
e
c
k the P
W
B
p
a
t
t
e
r
of CNPBBf.~/
The laser does not go on" .
Is the pickup in switch set to OFF?
OFF
Check the
The pickup in
switch is defective.
of the control
microcomputer.
n
f
r
o
m IC750.
I
there +5 V at the a890 collector?
S
Is there +5 V at pin 5 of CNP700? k The PWB pattern between 0890 and pin 5 of CNP700 is damaged. -1
When the disc is removed, is the
pickup mowng up and down?
Is the focus gain adfusting VR751 sst
to the minimum position?
No
waveform input to pin 40(FE OUT) of
ON
Is the waveform shown at right input
at pin 7(HFOKI of IC750?
Is a saw-toofh wave generating at pin
I
S
Is the saw-tooth wave generating
between pins 3 and 6 of IC700 (same
Is the saw-tooth wave generating
between pins 2 and 3 of CNP700
(same waveform as shown above)?
k the LCD PWB of CD. (Check the LD ON terminal of pin 9 of IC97f.)
Check the +5 V line of pin 1 of CNPBBI.
Check between pin 17 of CNP851B and Q890 base. If OK, 0890 is defective.
NO
- -
Check the item of 7he saw-tooth wave for focus servo does
Readjust the focus gain.
Does the saw-tooth wave look like the
Check the R779 and 6767 (pins 23
and 22 of IC750). If OK, IC750 is
Yes. (The saw-tooth wave oscillates
to the positive side once.)
Check the peripheral circuits of pin 35(FSR IN) of IC750. If OK, lC750 is defective.
Check the peripheral parts of IC700 and the power line. If OK, IC700 IS defective.
The CNPPOO and flexible PWB are connected improperly or the pickup isdetectiy,j
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