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1
Pickup (P.U.) transmission initial
operation does not occur.
Does pulse of
1.65V 1.65V develop at
pin 162 of IC502?
Y
Check feed gear.
N
N
3
Does focus search
voltage of 1.65V 0.4V develop
at pin 1 of IC504 (E597)?
Y
Does search signal
output at both edges of focus coil?
(Pins 10 to 13 of CN501)
Y
Check pickup head
and wiring.
The pickup transmission initial operation is carried out to
determine the initial position by transmitting the pickup to the
innermost position once (start-limit switch (pin 4 of CN503)
develops "L".) and to the external direction at low speed
(start-limit switch develops "H", turning off the switch.).
N
Check BUS between IC502
and IC601 and oscillation.
Fig. 1-3-2
2-1
"No disc" misjudgement display of
disc presence.
Does lens move with
UP/DOWN full stroke in
focus direction?
Y
Is laser current normal?
Y
Does SBAD signal
develop more than 0.3V?
Y
Check peripheral
circuit of IC601.
N
Replace pickup head.
Check IC502.
N
Check IC505.
Fig. 1-3-3
1-7
N
Check IC501.
Lens cleaning.
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