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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).
8
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at circuit
Ground OK.
STE/ICE-R #88.
breaker CB6 where wire 9
Wire 80 OK.
REASON FOR QUESTION
connects?
Circuit breaker CB8 OK.
If 24 vdc is present, circuit breaker
Wire 3 OK.
CB6 faulty.
Relay K1 OK.
Wire 1 OK.
POSSIBLE PROBLEMS
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 9 of this
NO
fault.
YES
Replace circuit
breaker CB6
(Para 8-11).
9
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at connector
Ground OK.
STE/ICE-R #88.
J2-1?
Wire 80 OK.
REASON FOR QUESTION
Circuit breaker CB8 OK.
This question eliminates possible
Wire 3 OK.
problems and determines where
Relay K1 OK.
troubleshooting continues.
Wire 1 OK.
Circuit breaker CB6 OK.
POSSIBLE PROBLEMS
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 10 of
NO
this fault.
YES
Go to Step 11 of
this fault.
2-94
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