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
2. (Cont)
d. Bad PC board
a.
Turn mode switch to ACCESS. Set multi-
A8, or mode
meter to dc volts and connect positive
switch S3.
lead to terminals 7 and negative lead to
6 on TB9-A, and TB10-B, and TB11-C,
and TB12-D, and TB13-E in turn. Meter
should indicate 28 +2 vdc on each termi-
nal board.
b.
If meter indications are not correct on some
terminal boards, turn off switch S1 on
power supply. Remove PC board A8.
Lift board ejector until board pops out
of receptacle and then pull board straight
out. Set multimeter to ohms and connect
leads to chassis and terminal 6 on terminal
boards where voltage was incorrect. Meter
should indicate 0 ohms. Connect meter
leads to J8-17 and terminal 7 of terminal
board where voltage was incorrect. Meter
should indicate 0 ohms.
(1)
If meter does not indicate 0 ohms
when connected to terminal 6,
inspect jumper wires from term-
inal 6 to 5, from terminal 5 to
2, and wires that go to ground
for broken or loose connec-
tions.
(2)
If meter does not indicate 0 ohms
when connected to terminal 7,
inspect wires from terminal 7
to J12/P1, pin 24, and from
J12/P1, pin 24 to J8-17 for
broken or loose connections.
Resolder any bad connections
on P1.
c.
If meter indications are incorrect on all
terminal boards, turn off switch S1 on
power supply. Remove PC board A8.
Lift board ejector until board pops out of
receptacle and then pull board straight
out.
d.
Turn on switch S1 on power supply. De-
press TRANSMITTER RESYNC switch
5-41
