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
f.
If meter indicates 20 vdc at J11-17,
identification
replace faulty PC boards A11 or
circuitry.
A12.
(Cont)
(1) To remove PC boards A11 and A12,
turn off switch S1 on top of
power supply. Place thumb or
finger under board ejector on
A11 and lift up until board
pops out of receptacle at back of
status processor. Then grasp PC
board and pull straight out.
Carefully pull A11 and A12
apart.
(2) To install new PC board A11 and
A12, align sockets on A12 with
pins on A11. Carefully press
boards together until pins are
fully engaged in sockets. En-
sure that pins on A11 are not
bent or otherwise damaged.
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
5-103
