Quantcast CAB DEFROSTER FAN(S) DO NOT OPERATE - continued - TM-10-3930-673-20-10144

 

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CAB DEFROSTER FAN(S) DO NOT OPERATE - continued - TM-10-3930-673-20-10143
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CAB DEFROSTER FAN(S) DO NOT OPERATE - continued - TM-10-3930-673-20-10145
TM 10-3930-673-20-1
4. CAB DEFROSTER FAN(S) DO NOT OPERATE (CONT).
6
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at relay K1
Ground OK.
STE/ICE-R #88.
where wire 1 connects?
Wire 80 OK.
REASON FOR QUESTION
Circuit breaker CB8 OK.
If 24 vdc is present, relay K1 faulty.
Wire 3 OK.
POSSIBLE PROBLEMS
Relay K1 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 7 of this
NO
fault.
YES
Replace relay K1
(Para 8-23).
7
KNOWN INFO
TEST OPTIONS
Fan OK.
Voltage test.
Is 24 vdc present at circuit
Ground OK.
STE/ICE-R #88.
breaker CB6 where wire 1
Wire 80 OK.
REASON FOR QUESTION
connects?
Circuit breaker CB8 OK.
If 24 vdc is present, wire 1 faulty.
Wire 3 OK.
Relay K1 OK.
POSSIBLE PROBLEMS
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 8 of this
NO
fault.
YES
Repair wire 1
(Para 8-48).
2-92

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