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TROUBLESHOOTING FLOW CHARTS
NO POWER
Is
Fuse (F601)
open?
Yes
No
Check:
• PS601 (Posistor),
D601, IC601, IC602
(Q402: H-out Tr)
Check:
• R601 (Rush Resistor)
Is
the voltage of T681
supplied?
Is the 39pin of
IC801(CPU) output
to "H" (+5V)?
Yes
Yes
No
Check:
• "5V" Line (from IC1611 to IC801[22pin]),
• Parts around IC801, IC802 (Reset),
IC803(Memory) and X8219(Crystal)
• Bus line
(See "Block Diagram of Bus Line.")
No
Check:
• "Power Fail" circuit.
(Refer to "SERVICE HINTS.")
• Q1611 and D1611 (Relay Switch)