Strobe Power Supply Removal; Strobe Power Supply Installation - Piper PA-44-180 SEMINOLE Maintenance Manual

2. Check for malfunction in interconnecting cables.
A short of the type described in Steps 3 and 4 will not cause
p e rmanent damage to the power supply, but will render the system
i n o p e r ative.
3. Check that pins 1 and 3 of interconnecting cable are not reversed.
4. Using an ohmmeter, check for a short between Pin 1 and 3 of interconnecting cable. If a reading is
obtained on the meter, the cable is shorted and must be replaced.
WHEN DISCONNECTING THE POWER SUPPLY,
ALLOW FIVE MINUTES OF BLEED DOWN TIME
PRIOR TO HANDLING THE UNIT.
5. Check interconnecting cables for shorts.
6. Disconnect the output cables from the power supply outlets.
7. Use an ohmmeter to make the following continuity checks:
A. Check for continuity between the connectors of each interconnecting cable by checking from Pin
1 to Pin 1, Pin 2 to Pin 2, and Pin 3 to Pin 3. If no continuity exists, the cable is broken and must
be replaced.
ANY CONNECTION BETWEEN PINS 1 AND 2 OF T H E
INTERCONNECTING CABLE WILL DIS C H A R G E
THE CONDENSER IN THE POWER SUP P LY AND
DESTROY THE TRIGGER CIRCUITS.
B . 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 must be replaced.
8. Check the tube socket assembly for shorts.
9. Disconnect the tube socket assembly of the anti-collision light from the interconnecting cable.
10. Using an ohmmeter, 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.
REMOVAL OF STROBE POWER SUPPLY.
1. Remove the access panel in the baggage compartment to gain access to the power supply.
2. Disconnect the electrical plugs and make note of their placement to facilitate reinstallation.
3. Disconnect the other electrical leads and label them to facilitate reinstallation.
4. Remove the four screws securing the power supply to the plate and remove the supply.
INSTALLATION OF STROBE POWER SUPPLY.
1. Secure the power supply to the plate with the four screws previously removed.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— NOTE —
— CAUTION —
— CAUTION —
2I12
33-43-04
Page 33-5
Revised: June 20, 1995