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Page Title:
CAB DEFROSTER FAN(S) DO NOT OPERATE - continued |
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 TM 10-3930-673-20-1
4. CAB DEFROSTER FAN(S) DO NOT OPERATE (CONT).
2
KNOWN INFO
TEST OPTIONS
None.
Continuity test.
Is continuity present between
STE/ICE-R #91.
POSSIBLE PROBLEMS
fan ground and fan guard?
REASON FOR QUESTION
Fan(s) faulty.
Wire 80 faulty.
If continuity is not present, fan
Circuit breaker CB8 faulty.
faulty.
Wire 3 faulty.
Relay K1 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Replace faulty fan
NO
(Para 17-6).
YES
3
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at circuit
Ground OK.
STE/ICE-R #88.
breaker CB8 where wire 80
POSSIBLE PROBLEMS
REASON FOR QUESTION
connects?
Wire 80 faulty.
If 24 vdc is present, wire 80 faulty.
Circuit breaker CB8 faulty.
Wire 3 faulty.
Relay K1 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 4 of this
NO
fault.
YES
Repair wire 80
(Para 8-48).
2-88
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