TM 11-5895-846-14
Table 8-13. Alarm Monitor, Troubleshooting Chart - Continued
Item of Check
Test Conditions
Normal Indications
Remarks
c. On the UUT, connect one end of a
Pulsating tone.
If tone is not heard re-
test lead to ground and the other
place LS1.
lead to the MINUS (-) terminal
of LS1. Listen for the indications.
d. On the UUT place POWER cir-
See figure FO-20. Check wir-
cuit breaker (CB1) to the OFF
ing from S1-9 to chassis
position. Connect the multi-
ground.
meter (set for ohms) to ground
terminal 9 of switch S1.
After normal indication is ob-
tained, turn on POWER switch
S1. After normal indication is
obtained, turn on POWER
switch CB1.
e. On the UUT, place FAULT
Pulsating tone.
See figure FO-20. If no tone
switch S1 to the NORMAL
is heard, check wiring
position. Connect one end
between XA1-8 and
of a test lead to ground and the
S1-8. If tone is heard
other end to pin 8 of chassis
proceed to step 4.
connector XA-1. Listen for
the indication.
a. On the UUT front panel press-
4.
Fault and safety in-
Momentarily ON.
See figure FO-20. If any in-
dicator wiring.
to-test all the lamp indicators
dicator does not turn on
(except ac indicators). Ob-
check for + 24 V at pin 1
serve each indicator.
and pin 3 of the lamps socket.
Check wiring and repair as
required.
b. On the UUT, connect one end of
XA1-3, DS4: momentarily
If no indication, check
a test lead to ground. See figure
ON. (waveguide)
wiring between XA1-3
8-7 and figure FO-17. Momen-
and XD54-2.
tarily connect the other end of the
test lead to XA1-3. Observe
indicator DS4 (WAVEGUIDE
INTERLOCK).
c. Repeat step b above but for the
XA1-4, DS5 (ANT)
If no indication, check
following pins and indicators
XA1-5, DS6 (RSS)
wiring between asso-
as listed in the Normal
XA1-6, DS2 (DC PWR)
ciated pin on XA1 and
indication column.
XA1-7, DS3 (CSS Temp)
2 on the lamp socket.
XA1-9, DS7 (CSS) all
momentarily ON.
a. Open the UUT access cover.
5.
Fault switch wiring.
DS8: Momentarily ON.
If no indication, check
See figure 8-7 and figure FO-17.
wiring between XDS8-2
Momentarily place fault switch
and S2-6 and S2-2
1 (S2) to the OVERRIDE
and ground. Also
position and return to NOR-
check switch operation.
MAL. Observe OVERRIDE
indicator DS8.
b. Repeat step a above but for
DS8: Momentarily ON.
If no indication, check as-
fault switches 2 through 12
sociated switch and
(S3 through S13). Observe
wiring.
OVERRIDE indicator DS8.
c. On the UUT, connect the multi-
+ 5 V 0.5 V
If no indication, check
meter (set for dc volts) to XA1-26
S14 operation, wiring
(+) and ground. Momentarily
to unit connector P2,
operate switch S14 (fig. 8-12,
and wiring to XA1-26.
SAFETY ALERT) to OVER-
RIDE and then release. Observe
the multimeter.
8-38
