Troubleshooting - Casio AP-10 Service Manual

1. No power
(A)
Replace PS2M PCB.

TROUBLESHOOTING

Check fuse F101.
Is F101 blown up?
Check fuse F102.
Is F102 blown up?
Measure output voltage of
transformer T101.
Is voltage 14 V AC?
No
Is voltage VC 17 V DC?
No
Is voltage VDD + 5 V DC?
No
Does signal NMI vary
as Fig 1?
Yes
Does signal POWER vary
as Fig 1?
Replace MA1M PCB.
Yes
No
Yes
No
No
Yes
Yes
Yes
Set voltage selector at proper
positon.
Yes
No
— 13 —
Replace F101.
Replace F102.
• Check power switch.
• Check position of voltage
selector.
Is it OK ?
No
Replace T101.
Switch ON
VDD voltage
Signal NMl
0.9 sec
Signal POWER
Fig 1
Yes