Table 7-4. Troubleshooting Radio Intercept Control Switchboard SB-2602/G - Continued

TM 32-5895-227-14&P

Table 74. Troubleshooting Radio Intercept Control Switchboard SB-2602/G - Continued

Item

Trouble symptom

Probable trouble

Corrective action

number

Special intercom

Defective magnetically-held type SPEC

With the SPEC MON switch held in the

operator is unable

MON switch SW63, SW64, or SW65

closed position, check for presence of

20 Vdc at SPEC MON switch holding

to monitor either the

coil. If 20 Vdc is not present and coil is

third, fourth, or fifth

not energized, switch is defective.

special intercom

Remove and replace switch.

stations.

NOTE

Troubleshooting for the second special intercom circuit and the first row of the special monitor

buttons (located at the right-hand side of the switchboard) will be the same as the second r ow

of special monitor buttons, since the function of both rows of the switches are the same; however,

switch numbers will differ.

Special intercom

Defective relay K27, K29, or K31

Special intercom operator No. 1 to

monitor special intercom stations

operator No. 1 is

through the first row of SPEC MON

unable to talk to

switches, then depress SPEC ICOM

either the 3rd, 4th, or

switch SW62 and check for presence of

5th special intercom

20 Vdc at relay coils K27, K29, or K31.

stations being

If 20 Vdc is present and relay is not

monitored by the first

energized, relay is defective. Remove

row of SPEC MON

and replace relay.

switches.

Special intercom

Defective relay K28, K30, or K32

Special intercom operator No. 2 to

monitor special intercom stations

operator No. 2 is

through the second row of SPEC MON

unable to talk to

switches, then depress SPEC ICOM

either the 3rd, 4th, or

switch SW66 and check for presence of

5th special intercom

20 Vdc at relay coil K28, K30, or K32. If

stations being

20 Vdc is present and relay is not

monitored by the

energized, relay is defective. Remove

SPEC MON

and replace relay.

switches.

Initiated call to

Defective relays K22 through K26

Depress RICS switch at special intercom

SB-2602/G by any

stations 1 through 5 and check for

one of the SPEC

presence of 20 Vdc at relay coil. If 20

ICOM stations No. 1

Vdc is present and coil is not energized,

through No. 5 does

relay is defective. Remove and replace

not blink special

relay.

intercom stations

RICS light, or the SB-

2602/G SPEC ICOM

light.

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