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CONTINUITY AND VOLTAGE CHECKS.
Table 3-3. Switch Continuity Checks - Continued
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
Should
incorrect;
From
To
To
Read
1.
Test
switch.
ALARM
J1
Pin
14
Depress
Open
J1
Pin
25
Replace
defective
RESET
Release
J1
Pin
14
Short
J1
Pin
25
switch
(Para
3-33).
(Pushbutton)
2. Test
for
bro-
ken
switch
wires.
Replace
branched
wiring
harnes
(Para
3-52)
1.
Test
switch
4
J1
Pin
26
J3
Pin
34
ALARM
TEST
Short
Replace defective
6
J3
Pin
4
J1
Pin
26
(Electronics)
Short
switch
(Para
3-32).
10
J1
Pin
26
J3
Pin
5
Module
Short
12
J1
Pin
26
J3
Pin
33
Short
Section)
2. Test
for
bro-
ken
switch
wires.
Replace
branched
wiring
harness
(Para
3-52).
1.
Test
switch.
ALARM
TEST
OFF
J4
Pin
N
Open
J3
Pin
30
Replace defective
J4
Pin
N
ON
J3
Pin
30
Short
(Remote
switch
(Para
3-31).
Alarmboard
2. Test
for
bro-
Section)
ken
switch
wires.
Replace
branched
wiring
harness
(Para
3-52.)
1.
Test
switch.
ALARM
Short
ON
(UP)
J4
Pin
R
J3
Pin
29
Replace defective
ACTUATE
J4
Pin
P
Short
J4
Pin
B
switch
(Para
3-31).
NEUTRAL
Open
J4
Pin
P
J3
Pin
29
2. Test
for
bro-
NEUTRAL
Open
J4
Pin
R
J4
Pin
B
ken
switch
wires.
Replace
branched
J4
Pin
P
Short
On
(DOWN:
J3
Pin
29
wiring
branched
J4
Pin
R
Short
J4
Pin
B
wiring
harness
(Para
3-52).
1.
Test
switch.
Black
Red
Test
AMMETER
Short
SHUNT
Replace defective
Test
Point
switch
(Para
3-28).
Point
(Current
2. Test
for
bro-
(Current
Measure)
MEASURE
Open
ken
switch
wires.
Measure)
Replace
branched
wiring
harness
(Para
3-52).
3-40
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