TM 5-6350-264-14&P-10
NAVELEX EE 181-AA-OMI-110/E121 C-9412
T.O. 31S9-2FSS9-1-10
Table 5-2. Troubleshooting Procedures - Continued
Trouble
Probable cause
Corrective action
8.
(Cont)
Bad alarm
(2) To install new PC board A11 and
identification
A12, align sockets on A12
circuitry.
with pins on A11. Carefully
(Cont)
press boards together until
pins are fully engaged in soc-
kets. Ensure that pins on A11
are not bent or otherwise dam-
aged. Turn PC board A11 so
plastic ejector is toward top.
Align board with guides at top
and bottom of status processor.
Slide board straight in until it
contacts receptacle at back of
processor. Then press firmly
on board until it seats com-
pletely in receptacle.
(3) Turn on switch S1 on power sup-
ply. Depress TRANSMITTER
RESYNC switch S2. Wait
about 5 minutes for system to
stabilize. During 5-minute
stabilization period, check
power supply. Set multimeter
to dc volts and connect nega-
tive lead to chassis (ground).
Connect positive lead to power
supply, TB2-3. Meter should
indicate 20 ±1 vdc. Connect
positive lead to TB2-5. Meter
should indicate 5 ±0.25 vdc.
Connect lead to TB2-2. Meter
should indicate 28 ±2 vdc.
Turn mode switch to TEST/
RESET and then to SECURE.
k.
Remove PC boards A11 and A12. Set
multimeter to dc volts and connect
leads to J11-8 (+) and chassis (-).
After expiration of time delay, if
meter indicates 0 volts, replace
PC board A9.
(1) To remove PC board A9, turn off
switch S1 on top of power
supply. Place thumb or finger
under board ejector and lift up
5-108
