12.1. Distinguish the trouble cause
How to distinguish the trouble
1. View mechanical part if visual damage occurred.
Confirm the movement of mechanical parts assembly
(tray ass’y, loading mechanism ass’y, etc.).
2. Diagnose if Optical Pickup Unit is faulty (refer to
diagnosis of Optical Pickup Unit).
3. If mechanism and OPU are OK, it is P.C.B.
Cause 1 Possible fault
1. AC Inlet Circuit/Voltage Selector Circuit Fuse Blow (F1,F2), Power Transformer Problem(T501,
T502), Wrong Selection of Selector (S501)
2. Power Circuit Fuse Blow (F3, F4) FP951, FP950 open
3. Power Amp Circuit IC502 faulty
4. Power Supply Circuit IC500, IC501 faulty
5. Panel Circuit FL Display Problem (-VP → Q950 faulty/ FP951 open/ D961
faulty)
SVS6V to Micro-P (Q951/ D965 faulty) Problem
Cause 2 Possible fault
1. Mechanical block Tray and loading mechanical block, traverse unit, deck unit
2. O.P.U. Refer to the diagnosis of OPU
3. Circuit IC307 faulty (check for pin 31, 32)
IC701 faulty (check for pin 2, 23)
4. Power circuit Refer to Cause 1
Cause 3 Possible fault
1. Mechanical block Traverse block (Tilt adjustment)
2. O.P.U. Refer to the diagnosis of OPU
18
SA-VK61DEE
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