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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).
4
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at circuit
Ground OK.
STE/ICE-R #88.
breaker CB8 where wire 3
Wire 80 OK.
REASON FOR QUESTION
connects?
POSSIBLE PROBLEMS
If 24 vdc is present, circuit breaker
Circuit breaker CB8 faulty.
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 5 of this
NO
fault.
YES
Replace circuit
breaker CB8
(Para 8-11).
5
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at relay K1
Ground OK.
STE/ICE-R #88.
(run relay) where wire 3
Wire 80 OK.
REASON FOR QUESTION
connects?
Circuit breaker CB8 OK.
If 24 vdc is present, wire 3 faulty.
POSSIBLE PROBLEMS
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 6 of this
NO
fault.
YES
Repair wire 3
(Para 8-48).
2-90
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