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Figure 2-3. Holding transmitter (three positions) in vertical attitude for firing.
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TM-9-1375-213-12-3 Firing Decive Demolition.M122 (NSN 1375-01-021-0606) (EIC: 2NA) Manual
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CAUSE OF MALFUNCTIONS
TM 9-1375-213-12-3
TO 11A20-15-1
b. To recover the receiver for reuse, pro-
(a) Reset transmitter to zero at
transmitter site.
ceed as follows:
(1) Return to the receiver site only
after it has been determined that the charge
WARNING
has fired. In event of misfire, refer to para-
graph 2-4c below.
HOUR
BEFORE
WAIT
1/2
MISFIRED
APPROACHING A
(2) Hold receiver body steady and lift
CHARGE. WHEN A OPERATOR
arming switch and move it to the SAFE posi-
RECEIVER
APPROACHES
tion.
AFTER A MISFIRE, IT IS
ADVISABLE THAT HE TAKE THE
(3) Disconnect the firing leads and
TRANSMITTER WITH HIM IN
antenna from receiver.
ORDER TO PREVENT THE
R E C E I V E R  F R O M BEING
c. Misfire procedure if charge fails to fire
INADVERTENTLY ACTIVATED BY
when the FIRE button is pushed is as follows:
THE
ELSE.
SOMEONE
TRANSMITTER'S
(1) Recheck to make sure at least 8 min-
SHOULD BE RETRACTED.
utes have passed since the receiver's arming
switch was moved to the ARM position.
(2) Recheck the transmitter's code set-
NOTE
ting. Use a flat tip screwdriver to rotate area
code switch back and forth through all posi-
During waiting time check out another
tions five times. Reset area code.
receiver, if available, refer to paragraph
3-9d.
(3) If 8 minutes have definitely passed
since arming the receiver, again lift the FIRE
button cover and press the FIRE button.
waiting
hour,
1/2
(b) After
(4) If the charge still fails to fire, set
approach receiver and separated and cut lead
the code to all zeros, (any area code) lift the
wires from receiver blasting cap binding posts
FIRE button cover, press and hold FIRE button
one at a time without disturbing receiver or
for 5 seconds, and observe lamp. If the FIRE
caps and connections.
SIGNAL lam fails to light, secure another
transmitter, if possible, an attempt to fire the
(c) Strip an inch of insulation
charge with it.
from the cut lead wires and twist the wires to
short them. Remove remaining sections of cut
(5) If FIRE SIGNAL lamp lights, reset
wires from binding posts.
transmitter for proper code settings for the spe-
cific receiver being used and move closer to
(d) Place caps safely away from
receiver if such movement can be safely under-
charges and personnel, Check cap circuit using
taken from both a tactical standpoint as well as
M51 test set or galvanometers. Check wires for
consideration of the safe distance from the explo-
visual damage in the process.
sive. In addition to moving closer to receiver,
relocate transmitter, if possible, so that its sig-
(e) Using new receiver repeat
nal will reach the receiver from a different direc-
hook-up sequence starting with paragraph 2-31.
tion,
(f) If a new receiver is not avail-
(6) From the new position, lift the
able, check out current receiver as follows:
FIRE button cover and push the FIRE button
once again.
1. Retrieve and hold receiver
stead and lift and move arming switch to the
(7) If above  procedure still fails to
SAFE position.
result in initiation of the explosives, if possible,
secure another transmitter.  Set the proper
2. Assure that the receiver's
code and attempt to fire the charge in the nor-
battery cap is tightened to the index mark
mal manner.
located on the receiver's battery compartment
(8) If another transmitter cannot be
secured or if it too fails to initiate the charge,
3. Assure receiver's antenna
proceed as follows:
is properly connected and is NOT being
grounded.
2-9

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