Table 4-3. Troubleshooting Chart

TM 9-6685-202-14

the trouble TM 9-6685-202-14 are given in the chart

Table 4-3 lists the applicable sequence in performing a

step-by-step procedure for locating and replacing the

itself.

defective components of the barometer.

Where

4-10. Troubleshooting Chart

possible, reference has been made to the applicable

Table 4-3 is a list of possible troubles and

paragraph for repair or correction of the fault. Where no

malfunctions, the defective condition which may be

paragraph is directly applicable, methods for correcting

causing the trouble and the remedy for correcting the

condition.

Table 4-3. Troubleshooting Chart

Trouble

Probable Cause

Remedy

Lamp fails to light

Improperly inserted

Withdraw battery

batteries.

tube and replace

batteries properly

(para 3-4).

Weak batteries

Withdraw battery

tube and remove dry

cells. Replace

with fresh ones.

Use BA-30, type C.

Bulb loose or burned

Tighten or replace

out.

bulb (para 4-5f).

Barometer reads low

Air bubble in tube

Remove air bubble

(para 4-5d).

Mercury lost from

Check mercury level

barometer.

(para 4-5a).

Moisture in tube

Remove moisture

(para 4-5e).

Mercury in the tube

Air bubble in

Same as removing

moves in jumps as the

connecting passage.

moisture (para 4-5e).

pressure is varied

smoothly.

Constant applied

Applied correction

Loosen the two

correction variation

vernier scale not

applied correction

from given values.

properly set.

vernier mounting

screws. Set vernier

to read given value.

Tighten screws.

Disagreement of appl-

Dirt in sighting

Blow out sighting

ied correction scale

ring slide.

ring slide with

readings with values

compressed air.

given in table 4-2

4-9