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TM 11-5895-878-14&P
4-17. Troubleshooting Chart, Audible Alarm Panel
Item
Trouble Symptom
Probable trouble
Check and corrective maintenance
1
No alarm indication with ground a. Power not applied to panel.
a. Check to see that -48 vdc is between
on terminal 2 of TB1 or when
terminal 1 and 2, and 1 and 3. Replace
test switch SW1 is depressed.
bay -48 vdc fuse or check wiring if -48
vdc is not present.
b. Defective time delay relay.
b. Replace relay K1 with a known good
relay.
2
Continuous audible alarm and
Defective time delay.
Replace relay K1.
lamp flashing with SW1 is
depressed or alarm signal
(ground) is applied to terminal
2 of TB1.
3
Lamps flash but no audible
a. Defective resistor R1.
a. Check resistor R1. Replace R1 if open.
alarm when SW1 is depressed
b. Defective sonarlert.
b. If resistor (a above) is good, replace
alarm signal ( ground) is
sonarlert.
applied to terminal 2 of TB1.
4
Audible sound is normal, but
a Defective flasher.
a. Replace flasher.
lamps do not flash or lamps
b. Defective lamps DS1 and DS2.
b. Replace lamps DS1 and DS2 if lamps
remain on during audible
remain off and new flasher (a above)
sound.
did not help.
5
Normal operation, except lamp
Defective lamp.
Replace lamp DS1 or DS2 as required.
DS1 or DS2 does not light.
6
Normal. operation with alarm
a. Ground not applied to terminal 3 on
a. Check for ground on terminal 3 of TB1.
signal applied, but no alarm
TB1.
Repair wiring if required.
when test button SW1 is
b. Defective test switch.
b. Replace switch SW1.
depressed.
4-12

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