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Table 3-3. Switch Continuity Checks
Table 3.4. Lamp Resistance Checks
M140 Chemical Agent Alarm \(Nsn 6665-01-083-2749\)
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TM
3-6665-329-13&P
Table
3.3
Switch
Continuity
Checks
Measure
Resistance
Set
Switch
If
reading
is
Switch
Name
incorrect:
Should
From
To
To
Read
1.
Test
switch.
AUTOMATIC
ON
P1
Pin
3
P1
Pin
4
Open
Replace defective
BACKGROUND
switch
(Para
3-31).
2. Test
for
bro-
ken
switch
wires.
Replace
branched
wiring
harness
(Para
3-52).
1.
Test
switch.
P1
Pin
3
MOTOR
TURN-
OFF
P1
Pin
4
Short
Replace defective
P3
Pin
2
OFF
P2
Pin
B
Short
Depress
switch
(Para
3-33).
(Push-
P3
Pin
2
P2
Pin
B
Open
Release
switch)
2. Test
for
bro-
ken
switch
wires.
Replace
branched
wiring
harness
(Para
3-52).
OFFSET
1.
Test
switch.
P1
Pin
8
P1
Pin
1
162K
2%
(-)
INPUT
NEUTRAL
Replace defective
P1
Pin
8
P1
Pin
1
Open
NEUTRAL
switch
(Para
3-31).
P1
Pin
8
P2
Pin
A
Open
(+)
P1
Pin
8
P2
Pin
A
69K
2%
2. Test
for
bro-
ken
switch
wires.
Replace
branched
wiring
harness
(Para
3-52).
Table
3-4.
Lamp
Resistance
Checks
Measure
Resistance
If
reading
is
Lamp
Switch
incorrect;
Name
Settings
Should
From
To
Read
REMOTE
J3
Pin
15
None
J3
Pin
45
18
ohms
1. Replace
lamp
(Para
3-29).
None
J3
Pin
17
HORN
J3
Pin
24
18
ohms
(Electronics
module
section)
3-41
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