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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
between MAIN CONNECTOR
is present, troubleshoot the
TEST POINTS F(+) and
circuit through switch S3 to
C(-) when HALF GAIN
TEST POINT F.
switch S3 is depressed.
Defective component card
If dc voltage is not present, check
A02V8060.
for 26 volts ac at pin 14 of J66.
If ac voltage is present, replace
the card.
Defective 26 volts ac distribution
If 26 volts ac is not present,
circuit.
Troubleshoot the circuit to power
transformer T501.
PUMP power indicator lamp does
Broken connections between circuit
Check for 115 volts ac at terminal
not come on and pump does not
breaker switch S2 and motor or
2 of switch S2. If the voltage is
operate when switch S2 is
defective switch.
normal, troubleshoot the circuit
operated to the on (up) position.
through the switch to terminal B
on the motor; repair broken
connection or replace the switch
as required.
Broken connection at connector
If the voltage is not present at
J61 or in power cable.
contact 2 of S2, check the voltage
at the power source. If the
source voltage is normal, check
continuity through connector
J61 and power cable A02VS309-2;
repair as required.
PUMP power indicator lamp comes
Defective pump motor .
Check for 115 volts ac between
on but PUMP does not operate
terminals A and B of the motor.
when switch is operated t o the
If the voltage is normal, replace
on (up) position.
the pump.
Note. The following troubleshooting
procedures are also applicable to the
DIFF PRESSURE Indicator and It asso-
ciated regulator valve and tubing.
Indication on AIRSPEED indicator
Pump is not operating
Troubleshoot the power wiring to
remains at 0 as AIRSPEED
the pump. Repair as required.
REG knob is operated.
Tubing or loose or broken
If the pump is operating, check for
an air pressure indication on the
field tester airspeed indicator. If
there is no indication, check for
loose or broken tubing. Tighten
or replace as required.
Defective regulator valve
If the tubing is intact, disconnect
the pressure connection on the
pump side of the valve and check
for pressure. If the pressure is
present, replace the valve.
Blocked tubing to the indicator or
If the field tester airspeed indica-
a defective indicator.
tion is normal, remove the tub-
ing between the AIRSPEED
indicator, the regulator valve,
and the pump. Check that the
tubing is clear of foreign matter.
If the tubing is clear, replace
the indicator.
AIRSPEED indicator out of
Defective indicator
Check the AIRSPEED indication
when the pump is not operating.
51
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