TM 55-4920-244-14
(3) Remove screw and dust cover
(5) Repair broken wiring in cable
from rear of galvanometer. Provide several
harness as follows:
thicknesses of cloth or other suitable cover for
(a) If slack in wire beyond end
top of deck.
of cable harness permits, bare 1/4 inch of wire
at break and install in terminal in place of
CAUTION
broken end.
Failure to provide cover
(b) If insufficient slack is pres-
for deck may result in
ent, splice a suitable length of same size and
damage from melted sol-
color wire at break and cover splice with 3/32-
der or hot soldering iron.
or 1/8-inch plastic tubing or an approved elec-
trical tape. If same color wire is not available,
(4) Identify and tag wiring. Unsol-
use white wiring and color code insulation on
der and remove wiring from terminals in galva-
terminal end with color(s) of original wire.
nometer. Remove galvanometer and dust cover.
(c) If wiring break is detected
b. Disassembly and Repair. No disassem-
within cable harness and is readily located, re-
bly or repair is required. Replace on an as re-
pair as in (b) above. Do not splice more than
quired basis.
once in any conductor.
(d) If wiring break is detected
4-20. Galvanometer (GALVO-2) (Figure 4-8).
within cable harness and not readily located, re-
a. Removal. Remove galvanometer (69) in
place wire as outlined in (6) below.
accordance with paragraph
(e) Cover any minor damage to
b. Disassembly and Repair. Refer to para-
wiring insulation by covering individual wires
with 3/32- or 1/8-inch plastic tubing.
(6) Wiring having burned or with-
ered insulation will be repaired as follows:
(a) Trace affected wire to its
a. Removal.
origin. Unclamp and untie cable harness along
(1) Remove deck assembly (para. 4-
entire length of affected wire.
(b) Examine other wires in ca-
(2) Loosen setscrew and remove
ble harness for heat damage to insulation.
knob from potentiometer (19).
(c) Replace entire length of all
(3) Identify and tag wiring. Unsol-
damaged wiring, using same size and color wire.
der and remove wiring from potentiometer.
If same color wire is not available, use white
(4) Remove screws (30) which se-
wiring and color code insulation on both ends
cure potentiometer to deck (128). Remove po-
with color(s) of original wire.
tentiometer.
(d) Bundle wiring along origi-
NOTE
nal path of cable harness and lace in accordance
with TM 55-1500-323-25 at 1-inch intervals.
Remove gasket (O ring)
(7) Replace potentiometers if erratic
only if damaged.
action is noted as adjusting screw is turned.
b. Disassembly and Repair. No disassem-
bly or repair is required. Replace on an as re-
quired basis.
a. Removal.
4-22. Insulation Check Meter (Figure 4-8).
(1) Remove screws which secure gal-
vanometer (29) in deck (128).
a. Removal.
(2) Carefully remove galvanometer
(1) Remove screws which secure me-
from opening in deck as far as attached wiring
ter (39) to deck (128).
will permit.
CAUTION
CAUTION
Failure to provide cover
Do not strain or break
f o r deck may result in
wiring at rear of galva-
damage from melted sol-
nometer.
der or hot holdering iron.
4-19
