TM 1-1520-238-T-7
10–196
10–71. NITROGEN INERT MONITOR INDICATOR – IS NOT BLACK (OK) AND WHITE
10–71
(FAIL) WHEN PRESS TO TEST SWITCH IS DEPRESSED FOR 10 SECONDS
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R295 door opened,
R200 panel removed
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. With PRESS TO TEST button on NITROGEN
INERT MONITOR indicator depressed, check for
open between P436–B17 and P436–B18.
Does open exist?
YES
Go to step 2.
NO
Go to step 3.
2. With PRESS TO TEST button on NITROGEN
INERT MONITOR indicator depressed, check for
open between (A335):
S90–1 and S90–2.
Does open exist?
YES
Replace NIU
(TM 1-1520-238-23).
NO
Repair open wire between:
P436–B17 and (A335)S90 SP1,
P436–B18 and (A335)S90 SP2.
Go to paragraph 10–67.
3. Check for continuity between (A335):
L47–1 and L47–2.
Does continuity exist?
YES
Go to step 4.
NO
Replace NITROGEN INERT
MONITOR indicator
(TM 1-1520-238-23).
4. Check for open between:
P1085–5 and (A335)L47–2,
P1085–6 and (A335)L47–1,
P1085–7 and J436–B18,
P1085–8 and J436–B17.
Does open exist?
YES
Repair open wire.
Go to paragraph 10–67.
NO
Replace NIU
(TM 1-1520-238-23).
END OF TASK
