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Page Title:
BACK-UP ALARM DOES NOT OPERATE - continued |
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 TM 10-3930-673-20-1
3. BACK-UP ALARM DOES NOT OPERATE (CONT).
4
KNOWN INFO
TEST OPTIONS
Back-up alarm OK.
Voltage test.
Is 24 vdc present at circuit
Connector J1 OK.
STE/ICE-R 89.
breaker CB2 where wire 20
Connector P1 OK.
REASON FOR QUESTION
connects?
Wire 21 OK.
If 24 vdc is present, wire 20 faulty.
Back-up switch OK.
POSSIBLE PROBLEMS
Wire 20 faulty.
Circuit breaker CB2 faulty.
Wire 5 faulty.
Relay K2 faulty.
Wire 3 faulty.
Run relay K1 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Go to Step 5 of this
NO
Connector J2 faulty.
fault.
Connector P2 faulty.
YES
Repair wire 20
(Para 8-48).
5
KNOWN INFO
TEST OPTIONS
Back-up alarm OK.
Voltage test.
Is 24 vdc present at circuit
Connector J1 OK.
STE/ICE-R 89.
breaker CB2 where wire 5
Connector P1 OK.
REASON FOR QUESTION
connects?
Wire 21 OK.
If 24 vdc is present, circuit breaker
Back-up switch OK.
CB2 faulty.
Wire 20 OK.
POSSIBLE PROBLEMS
Circuit breaker CB2 faulty.
Wire 5 faulty.
Relay K2 faulty.
Wire 3 faulty.
Run relay K1 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Go to Step 6 of this
NO
Wire 9 faulty.
fault.
Connector J2 faulty.
Connector P2 faulty.
YES
Replace circuit
breaker CB2
(Para 8-11).
2-68
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