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Page Title:
Table 74. Troubleshooting Radio Intercept Control Switchboard SB-2602/G |
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 TM 32-5895-227-14&P
Table 74. Troubleshooting Radio Intercept Control Switchboard SB-2602/G
Item
Trouble symptom
Probable trouble
Corrective action
number
1
No power indication.
Burnt-out fuse
Check fuse F-l located at rear of SB-
2602/G.
Defective power supply PSI
Refer to FO-7. Check 115 Vac input to
power supply PSI at terminal board TB1.
Check for 26 Vdc at output of power
supply. If no output, power supply is
defective. Remove and replace faulty
PSI component as required.
2
Monitor lights and
Defective power supply PS2
Refer to FO-7. Check 115 Vac input to
special intercom fail
power supply PS2 at terminal board
to operate.
TB1.
Check for 24 Vdc at output of power
supply. If no output, power supply is
defective. Remove and replace faulty
PS2 component as required.
3
Blinker circuit fails
Defective power supply PS3
Refer to FO-7. Check 115 Vac input to
to operate.
power supply PS3 at terminal board
TB1.
Check for 24 Vdc at output of power
supply. If no output, power supply is
defective. Remove and replace faulty
PS3 component as required.
4
Inability to transmit.
Defective amplifier board No. 2
Trouble in amplifiers may be isolated by
substituting suspected amplifier board
with a board that is known to be
operable. Amplifier boards No. 1, No. 2,
and No. 3 are interchangeable.
Defective headset, microphone
Substitute suspected headset with a
headset that is known to be operable. If
headset operates normally, first headset
or its cable is defective.
5
Inability to receive.
Defective amplifier board No. 3
Troubleshoot as in item 4 above.
Defective headset
Troubleshoot as in item 4 above.
6
Lamps, relays, and
Defective power supply PSI
Refer to FO-7. Check for 115 Vac at
blinkers operate
power supply transformer pins X and Y.
normally, but trans-
Check for 26 Vdc at output of power
mit, receive, and
supply. If no output, power supply is
monitor functions fail.
defective. Remove and replace faulty
PS1 component as required.
7-12
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