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Page Title: Table 7-2. Troubleshooting Communications Control Console OA-7735/G
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TM 32-5895-227-14&P
(2) Wiring Diagram.  Refer to FO-5. This
7-7 TROUBLESHOOTING OA-7735/G.
diagram outlines the electrical means of performing
a.  General.  Perform the procedures indicated
maintenance on this unit. The unit consists of a power
below for sectionalizing, localizing, and isolating trouble
supply, a blinker circuit, an audio volume compression
to a particular circuit in the Communications Control
unit, and connectors, switches, relays, and associated
Console (CCC) OA-7735/G.
wiring.
b. Diagrams.
c.  Troubleshooting Chart.  Table 7-2 lists the
(1) Location Diagram. Refer to figure 7-3.
trouble symptoms, the probable troubles, and the
There are 18 identical stations. Corresponding switches
corrective actions to be taken.
and relays are shown in numerical sequence. A rear
view of the CCC panel indicates the proper jack location
for station, trunk, phone, and channel transfer relay
connections.
Table 7-2. Troubleshooting Communications Control Console OA-7735/G
Item
Trouble symptom
Probable trouble
Corrective action
number
1
No power indication.
Burned fuse
Check fuse F-1 located at rear of OA-
7735/G console.
Defective power supply PS1
Refer to FO-5. Check 115 Vac input to
power supply PS1 at terminal board TB2.
Check for 26 Vdc at output of power
supply. If no output, power supply is
defective. Remove and replace faulty
(PSI) component.
2
Blinkers fail to
Defective power supply PS2
Refer to FO-5. Check 115 Vac input to
operate.
power supply PS1 at terminal board TB3.
Check for 24 Vdc output of power supply.
If no output, power supply is defective.
Remove and replace faulty PS1 compo-
nent.
No output from blinker boards B1 and
Refer to FO-5. Check output of blinker
B2 to intercom switch S18
board Pin C to intercom switch S18.
3
Inability to transmit
Defective amplifier No. 1 or No. 2
Trouble in amplifier may be isolated by
and receive all
substituting suspected amplifier board
stations.
with a board that is known to be operable,
since boards No. 1, No. 2, and No. 3
are interchangeable.
No wiring continuity from amplifier
Refer to FO-5 and check continuity from
boards No. 1 and No. 2 to intercom
amplifier boards No. 1 and No. 2,
switch
sockets D and K, respectively, to
intercom switch S1.
7-6

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