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Section V. TROUBLESHOOTING		Up
TM-9-1220-238-14 Plotting Board Flash Ranging M18 W/E Manual		Next
Section VI. DISASSEMBLY AND ASSEMBLY

TM 9-1220-238-14
Table 3-3. Troubleshooting (Mechanical)
Item
No.
Malfunction
Probable cause
Corrective action
1
Frame assembly rotates
a. Broken or weak
a. Replace spring
with brake on.
brake lever.
para 4-17 fig B-6.
b. Worn or missing
b. Replace brake shoe,
brake shoe.
para 4-17 fig B-6
c. Crank damaged.
c. Replace crank,
para 4-17 fig B-6.
2
Frame assembly binds.
a. Improper assembly of
a. Remove frame assembly
frame and/or spindle
spindle and re-seat frame.
Para 2-3 fig 1-1.
b. Roller assembly or
b. Replace roller assembly
assemblies, malfunction.
Para 4-12e(1) and g,(1).
3
Plotting disk surface
Surface damage or beyond
Turn disk over or replace
precludes functional
serviceable life limit.
Para 4-12e fig B-1.
Accuracy.
4
Scale assembly scrapes
a. Improper thumbscrew
a. Adjust thumbscrew. Para 2-3b
disk surface.
Adjustment.
fig 2-1 or 2-2.
b. Bent, scale or links.
b. Replace scale assembly
Para 2-3 and d,
fig 2-1 or 2-2.
5
Scale assembly cannot be
a. Disk, plotting and
a. Adjust and orient
be oriented.
vernier scales out of
Para 3-13c, d, and e
adjustment.
fig 2-1 and 2-2.
b. Arm assembly bent
b. Replace scale assembly
or damaged.
Para 2-6a and b, fig B-2.
c. Bearing eccentrics out
c. Adjust eccentrics
of adjustment.
Para 4-13e fig B-2.
6
Vernier knob falls to
a. Brake components worn
a. Replace worn or damaged
orient frame assembly.
or damaged.
parts Para 4-17 fig B-6.
b. Broken or missing pin
b. Replace missing pin
in shaft, sleeve or
Para 4-17 fig B-6.
Knob.
c. Setscrew loose or
c. Tighten or replace
missing from slide.
setscrew. Para 4-17 fig B-6.
d. Shaft bent.
d. Replace shaft
Para 4-17 fig B-6.
7
Brace assembly binds In
a. Bent tubes or sleeves
a. Replace brace or
stowed or operational
in brace or damaged
support assembly
position.
leg sockets In support
Para 4-12 fig B-1.
Assembly.
b Cracked or defective
b. Replace defective parts
welding.
Para 4-12 fig B-1
-8
Support loose or unstable.
a. Damaged or missing
a. Replace wing screws
wing screws.
Para 4-12 fig B-1.
b. Leg foot plates bent
b. Replace leg
or defective welding.
Para-4-12 fig B-1.
9
Unable to secure brackets
Thumbscrews broken bent,
Replace thumbscrews Para 4-14, fig B-3,
to support assembly.
or missing.
4-15, fig B-4, 4-16, fig B-5.
3-8

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