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FIRING PROCEDURES cont'd
Up
TM-9-1375-213-12-3 Firing Decive Demolition.M122 (NSN 1375-01-021-0606) (EIC: 2NA) Manual
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Figure 2-4. General layout of detonating cord firing system.
TM 9-1375-213-12-3
TO 11A20-15-1
units to development agency will permit evalu-
4. Assure firing circuit has
ation of the units.
been properly connected.
5. If the problem is one of
2-7. APPLICATION NOTE
those in (2), (3), or (4) above, correct as
required and repeat arming and firing proce-
For demolition projects requiring a larger
If the
dure beginning with paragraph 2-3m.
number of caps  than a receiver can fire, the
problem is not one of those listed in (2), (3), or
receiver CAN be used with one or two electric
(4) above, use a standard blasting machine to
blasting caps to initiate a detonating cord
complete the operation. Refer to 2-5 below and
primed system (fig. 2-4). The detonating cord
perform the required maintenance. Check out
primed system is set up in the normal manner
ALL components involved. Turn in and report
as described in TM 9-1375-213-12, FM 5-250
defective items.
and other application type FMs.
2-5. CAUSE OF MALFUNCTIONS
NOTE
If during use or checkout a unit appears
defective, the usual cause is weak or defective
If a misfire is experienced in this type
batteries. Corrosion of the battery contacts is a
of application, it is advised to first cut
common cause of a malfunctioning unit. These
the detonationg cord to isolate the cap
defects should be corrected by the operating per-
from the main demolition set up.
sonnel. Procedures for battery replacement and
cleaning of battery contacts are detailed in para-
gaph 3-6. If the unit after battery replacement
and cleaning of battery contacts is still not
restored to operating condition, the electronic
2-8. OPERATION UNDER
components may be defective. Before this con-
UNUSUAL CONDITIONS
clusion may be definitely drawn, the suspect
unit should be checked out with another comple-
a. Cold. When the temperature is much
ments
unit (i.e., use another previously
below 50F an alkaline battery MUST be used
checked-out transmitter or receiver to check a
in the receiver to get a reasonable on-duty time.
transmitter or receiver. ) Refer to para-
If snow is present or anticipated, place a plastic
graph 1-2 for reporting of malfunctions.
bag or other available nonmetal covering
around the receiver and tie the open end
2-6. DISPOSITION OF DEFECTIVE
around the wires to keep snow or moisture
UNITS
from the binding posts where it could cause a
short between wires or ground them. The trans-
If during checkout or use, a unit is found to
mitter battery pack is alkaline and will operate
the transmitter right down to the lower operat-
be defective and the cause is not weak batteries
ing temperature limit, however, because its
or corroded battery contacts the defective com-
capacity is diminished by the cold, it is advis-
ponent should be turned in. During initial
return defective component.s to
able to keep it warm to gain maximum range.
Therefore, if possible, in sub-freezing tempera-
the developing agency. Forward the item to
tures keep the transmitter under your outer-
Commander,
US Army Armament, Munitions
and Chemical Command, ATTN: SMCRI-DLP
parka until it is time to use it. Operation of
transmitter with operator wearing gloves
(R), Building 299, Rock Island, IL 61299-5000.
requires that a pencil or small object be used to
Remove battery pack from the receiver and
depress the FIRE button. ALWAYS protect the
transmitter before packing, The units should
receiver from snow and rain using a plastic bag
be well-cushioned with crumpled newspapers,
or by carrying it under your coat.
polyurethane foam, or whatever cushioning
materials can be obtained. Return of defective
2-10

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