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Page Title:
Table 7-1. Troubleshooting Telephone Set TA-676/G |
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 TM 32-5895-227-14&P
Table 7-1. Troubleshooting Telephone Set TA-676/G
Item
Trouble symptom
Probable trouble
Corrective action
number
1
No power indication.
Defective power supply PS2
Check 20 Vdc output of PS2 (figure 7-2).
Remove and replace faulty PS2 component.
2
Inability to trans-
Defective handset
Substitute handset with a handset that is
mit or receive.
known to be operable. If telephone set
operates normally, the first handset or its
cable is defective. Replace handset.
Defective power supply PSI
Check for 26 Vdc output of PS1 (figure 7-2).
Remove and replace faulty PS 1
component.
3
Inability to receive
Defective amplifier board No. 4
Interchange amplifier board No. 1 or No. 2
on RICS or CCC
with amplifier board No. 4. Replace defec-
position.
tive component on board No. 4.
4
Inability to trans-
Defective amplifier board No. 3
Interchange amplifier board No. 1 or No. 2
mit on RICS or CCC
with amplifier board No. 4. Replace defec-
position.
tive components on board No. 4.
5
Inability to monitor
Defective monitor switches S3 through S6
Monitor switch held in closed position;
on individual channel.
check for 20 Vdc at switch holding coil.
With 20 Vdc present and coil de-energized,
switch is defective. Remove and replace
switch.
6
Inability to monitor.
Defective amplifier boards No. 1 and No. 2
Interchange amplifier board No. 1 or No. 2
with amplifier board No. 3 or No. 4.
Replace defective component on boards
No. 1 and No. 2.
7
Blinkers do not
Burnt-out light bulbs
Remove and replace bulbs as required.
operate.
Defective power supply PS2
Refer to figure 7-1. Check 115 Vac input
to power supply PS2. Check for 20 Vdc at
output of power supply. If no output
power, supply is defective. Remove and
replace faulty PS2 components as required.
7-5
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