Piper SARATOGA PA-32-301 Maintenance Manual page 356

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
1. Ascertain the input voltage at the power supply is 14-volts.
-CAUTION
When disconnecting and connecting the power supply input
connections, do not get the connections reversed. Reversedpolarity
of the input voltage for just an instant will permanently damage the
power supply. The reversed polarity destroys a protective diode in
the power supply, causing self-destruction from overheating of the
power supply. This damage is sometimes not immediately apparent,
but will cause failure of the system in time.
2. Check for malfunction in interconnecting cables.
A. Ascertain Pins I and 3 of interconnecting cable are not reversed.
B. Using an ohmmeter. check continuity between Pin I and 3 of interconnecting cable. If a reading
is obtained on the meter. the cable is shorted and should be replaced.
-NOTE -
A short of the type described in Steps A and B will not cause
permanent damage to the power supply, but the system will be
inoperative if such a short exists. A void any connection between
Pins I and 3 of the interconnecting
cable as this will discharge the
condenser in the power supply and destroy the trigger circuits.
-CA UTION
-
When disconnecting the power supply, allow five minutes of bleed
down time prior to handling the unit.
3. Check interconnecting cables for shorts.
A. Disconnect the output cables from the power supply outlets.
B. The following continuity checks can be made with an ohmmeter.
C. Check for continuity between the connectors of each interconnecting cable by checking from Pin
I to Pin 1. Pin 2 to Pin 2. and Pin 3 to Pin 3. When making these checks if no continuity exists. the cable is
broken and should be replaced.
D. Check continuity between Pins I and 2. 1 and 3. 2 and 3 of the interconnecting cable. If
continuity exists between any of these connections. the cable is shorted and should be replaced.
4. Check the tube socket assembly for shorts.
A. Disconnect the tube socket assembly of the anti-collision light from the interconnecting cable.
B. The following continuity checks can be made with an ohmmeter.
C. Check for continuity between Pin I of AMP connector to Pin I of tube socket. Pin 2 of AMP
connector to Pins 6 and 7 of tube socket and Pin 3 of AMP connector to Pin 4 of tube socket. When making
these tests. if no continuity exists, the tube socket assembly is broken and should be replaced.
-END
-
33-43-05
Page 33-09
Revised:
August 11, 1983
2D15