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
1.
(Cont)
b.
(Cont)
l.
Turn on switch S1 on power supply. De-
press TRANSMITTER RESYNC switch
S2. Wait about 5 minutes for system to
stabilize. During 5-minute stabilization
period, check power supply. Set multi-
meter to dc volts and connect negative
lead to chassis (ground). Connect posi-
tive lead to power supply, TB2-3.
Meter should indicate 20+1 vdc. Con-
nect positive lead to TB2-5. Meter
should indicate 5 +0.25 vdc. Connect
positive lead to TB2-2. Meter should
indicate 20 ± 2 vdc. Turn mode switch
to TEST/RESET and then to SECURE.
c.
Bad tamper cir.-
a.
Set multimeter to dc volts and connect
cuitry (tele-
positive meter lead to PC board A7,
phone dialer).
TP2 (red), and negative lead to chassis
(ground).
b.
If meter indicates 18.5 to 21 vdc, ensure
that there is a jumper between TB7-S-8,
TB7, S-8 and S-9. Set multimeter to
ohms and connect leads to TB7, S-8
and TB7, S-9.
c.
If meter indicates 0 ohms, turn off switch
S1 on power supply. Use board ejector
remove PC board A7. Connect meter
leads to J7-1 and 7.
d.
If meter indicates more than 100,000 ohms,
inspect J12/P1, pins 19 and 34 for bro-
ken or loose wires. Resolder any bad
connections on P1.
e.
If meter indicates 0 ohms at J4 and 7,
replace PC board A7.
To install new PC board, turn board
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.
5-18
