PS Magazine - TB 43-PS-689
PS, The Preventative Maintenance Monthly
ISSUE 689
APRIL 2010
44
PS 689
APR 10
O
ld guys may have a few years
on them, but they still can be
useful. That’s the case with the
TA-312 telephone. Some of you
Active Army Soldiers might
vthink the TA-312 is rocking in
a chair on the porch of some
commo retirement home. But
you’re
wrong!
Reservists and
National Guard troops know the
TA-312 is still communicating
vital
info
on
the
training
ground and battleFeld.
Operators, after rain or when humidity is high, remove the canvas cover, dry it and wipe
the set dry. The most critical area to keep dry is the battery compartment. Moisture will
corrode batteries and contacts. Wipe out the battery compartment with a clean cloth. If the
compartment is dirty, add cleaning compound to the cloth. Use burnisher, NSN 5120-00-255-
4458, to clean the contacts.
During rain, keep the set off the ground and covered with a poncho or anything handy.
Always put a drip loop in the Feld wire before connecting the wire to the binding posts.
This will keep water from running right onto the posts.
Name
NSN
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Wiring harness
Machine screw (2)
O-ring
Earphone element
Electrical cap
Air filter element
Microphone mouthpiece
Spacer ring
Packing retainer
Microphone element
Electrical contact assembly
Terminal lug (2)
Fixed capacitor
Electrical contact assembly
Microphone element
Voltage sensitive resistor
Machine screw (3)
Cord assembly
Machine screw (3)
Sensitive switch
Electrical switch cover
Electrical switch plate
Machine screw (2)
(order w/ SM-C-207921)
NSN
Name
Case screws
Rubber boots
De-ice shield
Retaining clip spring
Security lamp
Security warning labels
Caution label
A broken or lost generator handle probably means an
operator decided sudden stops or cranking the handle
backwards was fun. Or, maybe, they just forgot to tuck the
handle in when they were done cranking.
The handset might seem like a convenient handle for
carrying the telephone until it slips from the cradle and you
rip the cord off. Use the carrying strap or lift the whole set.
While the spring isn’t meant to hold up the phone, it should
secure the hand set. To test the retaining clip spring for proper
tension, stand the phone on end. If the handset stays in place,
the tension’s good. If it slips out, the spring is weak and needs
replacing. The spring gets weakened by jerking the handset
straight out from the cradle. To properly remove the handset,
push forward and lift up the transceiver end Frst.
A lot of folks like to doodle while they talk on the phone. TA-
312 operators have their own form of doodling—scratching on
the designation plate. Some might even think it’s creative. But
a missing or unreadable designation plate is a repairable part
on the telephone and requires money and time to replace.
TA-312/PT
Telephone Set…
Parts and
Maintenance
for the
Old Guy
here are some of the other
parts not shown you may need
to keep the ta-312 humming…
of course, all the
new parts in the world
won’t do the job if
your telephone doesn’t
get regular doses of
preventive maintenance.
here are a
few pm tips
you need
to apply
to your
phone…
the ta-312 is
tough, but not
indestructible.
here are few of
the vulnerable
areas…
who you
calling “old”,
sonny?
here’s a list of
parts for the
ta-312 telephone
h-60 handset,
nsn 5965-00-
669-9145…
EXCUSE
ME, I
HAVE TO
TAKE
THis!
689.44-45.indd
1-2
2/22/10
4:45:14 PM
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