3M
Multimedia Projector MP8670/8745/8755/8770
Troubleshooting
Copyright
2000, 3M IPC. All Rights Reserved.
3-2
3-2.
Power Cannot Be Turned On
Is
Voltage Input at
Pins 1, 4, 6 of EDS1
on the Main PWB at
Standby
Mode?
Measure
Voltage at Pin 28 of
EDI1 on the Main PWB
at Standby
Mode.
Power Unit
(Circuit)
Fuse
Filter
PWB
Disconnect
ETEP from Main PWB.
Retry Turn On?
Main PWB
Temperature
PWB
Main PWB
No
No
No
No
No
1 - (CHK0082): +12.5V
4 - (CHK0041): +6.6V
6 - (CHK0043): +17.0V
Yes
28 : (CHK0023) = H (H = 2.5V)
Yes
Power Cannot be
Turned On - AC On,
No LED's Lit
Check at operating mode
CHK0023 = L
