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10.2.8 DC FAN MOTORS/CHECK PCB
Start
Check fuse:
Checking fuse F5 on the PCB
Fuse blown? Yes Replace PCB and fan motor.
No
Check wiring and contacts at motor plugs CNF1, CNF2
Contacts loose?
Plug pulled?
Yes
Correct wiring.
No
Check supply voltage:
Check voltage across the following contacts on the external unit PCB:
TEST POINT [1]: VDC (across 1(+) and 4(–) at the plug): VDC DC 250 — 330 V
TEST POINT [2]: VCC (across 5(+) and 4(–) at the plug): VCC DC 15 V
Is the voltage as it should be? Yes Correct wiring.
No Yes
Replace PCB. Check fan motor function. Yes End
Faulty
Replace PCB
Check fan motor function Yes End
Faulty
Replace fan motor.
Table 41 DC fan motors/check PCB