NAVELEX EE 181-AA-OMI-110/E121 C-9412
Table 5-2. Troubleshooting Procedures - Continued
Set multimeter to dc volts and connect
positive meter lead to PC board A7-TP2
(red), and negative lead to chassis
If meter indicates 18.5 to 21 vdc, ensure
that there is a jumper between TB7,
S-8 and S-9. Set multimeter to ohms
and connect leads to TB7, S- and
S-9. If meter indicates more than
0 ohms, replace jumper.
If meter indicates 0 ohms, turn off switch
S1 on power supply. Use board ejector
to remove PC board A7. Connect
meter leads to J7-1 and J7-7.
If meter indicates more than 100, 000 ohms,
inspect J12/P1, pins 19 and 34 for
broken or loose wires. Resolder any
bad connections at P1, pins 19 and 34.
If meter indicates 0 ohms at J7-1 and J7-7,
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 re-
ceptacle at back of processor.
Then press firmly on board
until it seats completely in
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 ower sup-
ply. Set multimeter to dc volts
and connect negative lead to chassis
(ground). Connect positive lead to
power supply, TB2-3. Meter should
indicate 20 +1 vdc. Connect positive
lead to TB2-S. Meter should indicate