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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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