NAVELEX EE 181-AA-OMI-110/E121 C-9412
Table 5-1. Troubleshooting Procedures - Continued
Trouble Probable cause
until it contacts receptacle at back
of processor. Then press firmly on
board until it seats completely in
Turn on switch S1 on top of power sup-
ply. Connect meter leads to J9-18 and
J9-N. If meter still indicates over 100,000
ohms, remove PC board A10.
To remove PC board A10, turn off
switch S1 on top of power supply,
place thumb or finger under board
ejector and lift up until board pops
out of receptacle at back of status
processor. Then grasp PC board and
pull straight out.
Turn on switch S1 on power sup-
ply. Depress TRANSMITTER
RESYNC switch S2. Wait about
5 minutes for system to stabilize.
Turn mode switch to TEST/RE-
SET and then to SECURE.
Set multimeter to dc volts. Connect posi-
tive meter lead to J10-17 and negative
meter lead to chassis (ground). Meter
should indicate 18.5 to 21 vdc.
If this indication is not correct, inspect
wires from power supply TB2-3 to J12/
P1, pin 36, and from J12/P1, pin 36 to
J10-17 for loose or broken connections.
Resolder any bad connections at TB2-3,
or P1, pin 36.
Inspect fuse F2 at power supply. Re-
place if necessary.
Reconnect wires and jumpers to TB6,
S1-I, S1-IR, S1-D, and S1-DR. Replace
PC boards A9 and A10.
To install PC boards A9 and A10,
turn off switch S1 on top of power