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
Slide board straight in until it
identification
contacts receptacle at back of
processor. Then press firmly on
(Cont)
board until it seats completely
in receptacle.
9. Improper
a. Bad AC Power
a. Ensure switch S1 on CU power supply
AC indi-
indicator
is on.
cations.
lamp, DS1.
b. Set multimeter to ac volts and connect
leads to terminals on back of AC
POWER indicator lamp. Meter
should indicate 6.3 1 vac.
c.
If voltage indication is correct, replace
AC POWER indicator lamp, DS1.
(1) To remove AC POWER indicator
lamp, unscrew plastic lens
from front side of door. Grasp
lamp, press in, rotate counter-
clockwise, and pull out.
(2) To install new AC POWER indica-
tor lamp, insert it in socket,
press in, and rotate clockwise
until it locks in place. Put
plastic lens over lamp, and
screw in place.
b. Bad ac line
a. Carefully remove power supply cover.
fuse, power
Set multimeter to ac volts and
supply, or
connect leads to power supply
no ac power
TB5-1 and 2.
b. If meter indicates 0 volts, connect meter
leads to TB1-1 and 2. If meter in-
dicates 115 vac, replace ac line fuse
F1.
(1) To remove fuse F1, turn off switch
S1 on top of power supply.
Grasp knob on top of fuse
holder and unscrew about 1/4
turn. Pull knob straight out;
fuse will come with it. Pull fuse
out of knob.
5-113
