TM 55-1930-209-14&P-12
Table 4-3. Telephone System Troubleshooting (continued)
Condition
Possible Cause
Suggested Action
f. Power control module
f. Test and repair or replace,
and power amplifier
see para 4-18.2.5
malfunctioning
2. Telephone component
a. Circuit breaker 3P14
a. Close (ON) circuit breaker
not operating
supplying 24 Vdc open
(OFF)
b. Loose connection
b. Check connection
c. Cable damaged
c.Check circuit using multimeter
3. Telephone handset
a. See 2 a, b, and c
a. See 2a, b, and c above
not operating
above
b. Not plugged in
b. Check receptacle
properly
c. Handset malfunctioning
c. Replace handset, see para
4-18.2.1.2
d. Handset adapter
d. Test and repair or replace
module malfunctioning
module, see para 4-18.2.2
4. Indoor speaker monitor
a. See 2a, b, and c
a. See 2a, b, and c above
not operating
above
b. Volume off
b. Adjust volume control
c. Amplifier
c. Test and repair or replace,
malfunctioning
see para 4-18 2 5
d. Speaker malfunctioning
d. Test and repair or replace
speaker, see para 4-18 2 3
5. Telephone headset
a. See 2 a, b, and c
a. See 2a, b, and c above
not operating
above
b. Not plugged in
b. Check receptacle
properly
c. Handset malfunctioning
c. Test handset by substitution
and replace if necessary
d. Headset station
d. Test and repair or replace,
malfunctioning on
see para 4-18.2.7
station selector box
6. Telephone handset or
a. Volume control not
a. Reset volume control
headset sound too low
properly set
or too loud
b. Not plugged in
b. Check receptacle
properly
4-15
