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1
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.).
Pickup (P.U.) transmission initial operation does not occur.
Does pulse of 1.65V 1.65V develop at pin 162 of IC401? Y Check feed gear.
N
Check BUS between IC401 and IC605 and oscillation.
Fig. 1-3-2
2-1
"No disc" misjudgement display of disc presence.
N
Does lens move with UP/DOWN full stroke in focus direction? Y
3
N
Is laser current normal? Y
Does RFSB signal develop more than 0.3V?
N
Y Check peripheral circuit of IC605. Does focus search voltage of 1.65V 0.4V develop at pin 23 of IC503 (E544)? Y Does search signal output at both edges of focus coil? (Pins 15 to 18 of CN501) Y Check pickup head and wiring. N N Check IC401. Replace pickup head. Check IC502. Lens cleaning.
