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Page Title:
Table 6-3. Miscellaneous Test Circuit Troubleshooting (cont) |
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 C1, TM 11-6625-646-15
Trouble
Probable cause
Remedy
If the pointer is not on 0, adjust
the zero-adjusting screw and
repeat the calibration check of
the indicator. If the indication
is 0, replace the defective
indicator.
Indication on DIFF PRESSURE
Pump is not operating .
Troubleshoot the power wiring to
indicator remains at 0 as
the pump. Repair as required.
DIFF PRESS REG knob is
operated.
Tubing is loose or broken
If the pump is operating, check
for differential pressure indica-
tion on the field tester gage; if
there is no indication, check for
loose or broken tubing. Tighten
or replace tubing as required.
Defective regulator valve.
If the tubing is intact, disconnect
the air connection on the pump
side of the valve and check for
pressure. If pressure is available,
replace the valve.
Blocked tubing to the indicator or
If the field tester gage indication
a defective indicator.
is normal, remove the tubing
between the indicator, the reg-
ulator valve, and the pump.
Check that the tubing is clear of
foreign matter. If tubing is
clear, replace the indicator.
DIFF PRESSURE indicator out
Defective indicator
Check the DIFF PRESSURE
of calibration.
indication when the pump is not
operating. If the pointer is not at
0 adjust the zero-adjusting
screw and check the calibration
of the indicator. If the indication
is 0, replace the defective
indicator.
PITCH AXIS meter indications
Defective GAIN SWITCH S102 -
Check for continuity between
not as specified as adapter GAIN
adapter receptacle J101 pins B
SWITCH is operated.
and C with switch S102 at AIR.
If continuity is not present, re-
place switch S102.
ROLL AXIS meter indications not
Defective transformer T101
Check de resistance of T101 wind-
as specified as adapter ROLL
ings (table 6-4). If resistances
GYRO SIMULATOR switch is
are not as specified, replace
operated.
T101.
Defective resistor R101 through
Troubleshoot resistors and replace
R104. Defective switch S101.
as required. Check continuity
through switch contacts (fig. 1-7).
If continuity is not as required,
replace switch S101.
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