TM -11-6625-486-14&P
Action
Normal indication
Corrective measures
1. Set FUNCTION SW to CHK.
Voltage indicates in green area of
Check meter for jammed needles by
voltmeter scale.
gently tapping meter face. Check
batteries.
Portion of film not covered by mask
Check fuses.
is lighted.
2. Set RANGE SW to RANGE A.
Loud whistles heard in headset when If operating on ac power, check power
Plug headset into PHONES jack.
frequency meter is turned near a
cable and ac source.
crystal checkpoint.
3. Tune frequency meter to nearest
Higher category maintenance is required.
crystal checkpoint and adjust
Zero beat obtained on checkpoint.
CORRECTOR control for a zero
Check headset.
beat.
Zero beat obtained on checkpoint.
Check headset extension cable.
4. Set RANGE SW to RANGE B
Whistles heard in nearby radio
and RANGE C and repeat step 3.
receiver when frequency meter
Higher category maintenance is required.
tuning is varied.
5. Set FUNCTION SW to OPER.
Higher category maintenance is required.
Connect antenna to ANT. jack.
A modulated rf signal is heard in
headset.
Higher category maintenance is required.
6. Set FUNCTION SW to MOD.
Higher category maintenance is required.
Higher category maintenance is required.
Section IV. MAINTENANCE OF FREQUENCY METER
4-5. Cleaning
necessary, dampen the cloth with water or mild
detergent, for more effective cleaning.
Inspect the exterior of the frequency meter, the front
e.
Clean all cables and power cord with a
panel, and the interior of the front panel cover. All
clean, soft cloth.
surfaces should be clean and free of dust, dirt,
grease, and fungus.
4-6. Touchup Painting
a.
Remove dust and loose dirt with a clean,
a.
Clean rust and corrosion from metal
soft cloth.
WARNING
surfaces by lightly sanding them with fine
sandpaper. Brush two thin coats of paint on the bare
Degreasing solvent, MIL-PRF-
metal to protect it from further corrosion.
680, is combustible and toxic to
CAUTION
eyes, skin, and respiratory tract.
Do not use steel wool on
Wear protective gloves and
electronic equipment. Minute
goggles/face shield.
Avoid
metal particles may enter the
repeated or prolonged contact.
case
and
cause
internal
Use only in well-ventilated areas
shorting.
(or use approved respirator as
determined
by
local
b.
Paints and procedures used shall be in
safety/industrial
hygiene
accordance with TB 746-10.
personnel).
Keep away from
open flames or other sources of
ignition.
Replace the fuses as follows:
b.
Remove grease, fungus, and ground-in dirt
a. Press in the fuseholder and turn in
from the case with a cloth dampened (not wet) with
counterclockwise. Pull the fuseholder out to expose
degreasing solvent, MIL-PRF-680.
the effective fuse.
c.
Remove dust or dirt from plugs and jacks
b. Remove the blow fuse from the fuseholder
with a soft brush.
cap and install a new fuse.
CAUTION
NOTE
Do not press on the meter face
Be sure that the fuse is rated at
when cleaning. Damage to the
1/16 ampere, 125 volts, type
equipment may result.
3AG, slo-blo.
d.
Clean the front panel, meter face, readout
c. Press the fuseholder cap into the
window, and controls, using a soft clean cloth. If
fuseholder and turn it clockwise to lock.
Change 2
4-3/(4-4 blank)
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