Piper Arrow IV Turbo Maintenance Manual page 429

2. Check for malfunction in interconnecting cables.
A. Ascertain Pins 1 and 3 of interconnecting cable are not reversed.
B. Using an ohmmeter, check continuity between Pin 1 and 3 of interconnecting cable. If a reading is
obtained on the meter, the cable is shorted and should be replaced.
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. Avoid any connection between
Pins 1 and 3 of the interconnecting cable as this will discharge
the condenser in the power supply and destroy the trigger
circuits.
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 1
to Pin l, 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 1 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 1 of AMP connector to Pin 1 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.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—NOTE—
—CAUTION—
—END—
2G6
33-40-09
Page 33-10
December 1, 1978