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Page Title:
Table 7-4. Troubleshooting Radio Intercept Control Switchboard SB-2602/G - Continued |
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 TM 32-5895-227-14&P
Table 7-4. Troubleshooting Radio Intercept Control Switchboard SB-2602/G - Continued
Item
Trouble symptom
Probable trouble
Corrective action
number
6
No continuity between power supply
Check continuity from terminal board
continued
PSI and terminal board TB-1
TB-1 terminals 1 and 2 to PSI trans-
former, terminals X and Y, respectively.
7
Intercom fails to
Defective intercom switches SI through
Check for electrical continuity and
function (individual
S10
proper operation of intercom switches S1
status).
through S10.
Defective MON OFF switch S21
Check for electrical continuity and
8
Monitor switches will
proper operation of MON OFF switch
not hold when
S21.
depressed (all
channels).
9
Monitor switches will
Defective magnetically-held type
With monitor switch held in the closed
not hold when
monitor switches S11 through S20
position, check for presence of 20 Vdc at
depressed (individual
switch holding coil. If 20 Vdc is present
channels).
and coil is not energized, switch is
defective. Remove and replace switch.
Defective MON OFF switch S32
Check for electrical continuity and
10
Special monitor
proper operation of MON OFF switch
switches will not hold
S32.
when depressed (all
channels).
Defective magnetically-held type
Hold monitor switch in the closed
11
Special monitor
monitor switches S22 through S31
position; check for presence of 20 Vdc at
switches will not hold
switch holding coil. If 20 Vdc is present
when depressed
and coil is not energized, switch is
(individual channels).
defective. Remove and replace switch.
Faulty electrical connections .
Check that power cable connections at
12
Station transfer
J1 of SB-2602/G and J1 of SB-2601/G
indicator lamps on
are secure
SB-2602/G do not
illuminate when
Check continuity from the output of
No continuity between the output of
station transfer is
power supply PS2 to connector J1, pin L.
power supply PS2 and connector J1.
completed at SB-
2601/G.
13
First special intercom
Defective magnetically-held type
With monitor switch held in the closed
operator cannot
monitor switch SW22 through SW31
position, check 20 Vdc at switch holding
monitor any
coil. With 20 Vdc present and coil not
outstation on
energized, switch is defective. Remove
individual channels.
and replace.
7-13
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