NAVELEX EE 181-AA-OMI-110/E121 C-9412
Table 5-2. Troubleshooting Procedures - Continued
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. Connect posi-
tive lead to TB2-5. Meter should indicate
5 +0.25 vdc. Connect lead to TB2-2.
Meter should indicate 28 ±2 vdc. Turn
mode switch to TEST/RESET and then
Set multimeter to dc volts and connect
positive meter lead to PC board A7,
try or TAS.
TP1 (brown), and negative lead to chas-
sis (ground). Push TAS plunger all the
way in, and then pull plunger all the way
out. Meter should indicate less than
0.5 vdc for both switch positions. De-
press TAS plunger and then release.
Meter should indicate 18.5 to 21 vdc.
If these meter indications are not correct,
turn off switch S1 on top of power sup-
ply. Use board ejector to remove PC
board A7. Set multimeter to ohms and
connect meter leads to TAS terminals
which have wires attached. Push TAS
plunger all the way in, and then pull
plunger all the way out. Meter should
indicate 0 ohms for both switch posi-
tions. Depress TAS plunger and then
release. Meter should indicate over
If these meter indications are not cor-
rect, replace TAS.
(1) To remove TAS, remove two screws
that secure TAS to edge of CU
housing. Loosen screws that secure
crimp lugs to switch.
(2) To install new TAS, slip crimp
lugs under screw heads marked
COM and NO on switch, and
tighten screws. Insert switch through
hole in edge of housing from the