Troubleshooting Chart, Audible Alarm Panel

TM 11-5895-878-14&P

4-17. Troubleshooting Chart, Audible Alarm Panel

(fig. 4-4)

Item

Trouble Symptom

Probable trouble

Check and corrective maintenance

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.

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.

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.

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.

Normal operation, except lamp

Defective lamp.

Replace lamp DS1 or DS2 as required.

DS1 or DS2 does not light.

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