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3M
Multimedia Projector MP7770
Troubleshooting
2002, 3M IPC.
3-2
3-1-2. Fan Cooling System Check
Main Fan
working?
Cartridge Fan
working?
Lamp Fan
working?
Check
PIN1:+5V
PIN2:-5V
C1/J11
Check
PIN1:+4V
PIN2:GND
C1/J9
Check other fans
Change Main Fan
5b/12
Change Lamp Fan
5a/13
Change Cartridge Fan
7/9
NO
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
No
+5V
Check
PIN3
C1/J11
-5V
YES
NO
Check
PIN3..........
700Hz 7V pp
C1/J9
YES
NO
No
Check
PIN3..........
300Hz 5V pp
C1/J7
Check
PIN1:+3V
PIN2:-5V
C1/J7
Projector switch off after approx. 5sec.
Standby blinks red/yellow
C6/S10
Change Interface
5a/260
Check Flyback output
Voltages
Change Flyback-Converter
6/10
YES
NO
YES