THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 5
Jun 1/03
3H5
33-40-00
C. Strobe Power Supply (See Figures 3 and 4.)
The strobe power supply is located in the aft section of the fuselage.
(1) Removal
(a) Remove access panel to aft section of fuselage in rear baggage compartment to gain
access to power supply.
(b) Remove power supply disconnect electrical plugs and leads. (Make note of placement of
plugs to facilitate installation.)
(c) Remove screws securing power supply to fuselage. Power supply can now be removed.
(2) Installation
(a) Position power supply in place and secure with four screws previously removed.
(b) Connect electrical leads in their proper place.
(c) Connect electrical plugs in their proper place.
(d) Replace access panel in rear baggage compartment.
D. Troubleshooting Procedure (See Figure 4.)
Strobe light functions as a condenser discharge system. A condenser in the power supply is
charged to approximately 450 volts DC then discharged across Xenon flash tube at intervals of
approximately 45 flashes per minute. Condenser is parallel across the Xenon flash tube which is
designated to hold off the 450 volts DC applied until flash tube is triggered by an external pulse.
This pulse is generated by a solid state timing circuit in power supply.
When troubleshooting the strobe light system, first determine if the trouble is in the flash tube or the
power supply. Replacement of the flash tube will confirm if tube is defective. A nomally operating
power supply will emit an audible tone of 1 to 1.5 KHZ. If there is no sound emitted, check system
according to the following instructions. When troubleshooting system, use appropriate schematic in
Chapter 91.
(1) Verify input voltage at power supply is 28 volts.
CA
UTION: WHEN DISCONNECTING AND CONNECTING POWER SUPPLY INPUT
CONNECTIONS, DO NOT GET CONNECTIONS REVERSED. REVERSED
POLARITY OF INPUT VOLTAGE FOR JUST AN INSTANT WILL
PERMANENTLY DAMAGE POWER SUPPLY. REVERSED POLARITY
DESTROYS A PROTECTIVE DIODE IN POWER SUPPLY, CAUSING SELF-
DESTRUCTION FROM OVERHEATING OF POWER SUPPLY. THIS DAMAGE IS
SOMETIMES NOT IMMEDIATELY APPARENT, BUT WILL CAUSE FAILURE OF
SYSTEM IN TIME.
(2) Check for malfunction in interconnecting cables.
NOTE: A short of the type described in steps a and b, below, 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 interconnecting cable as this will
discharge the condenser into the power supply and destroy the trigger circuits.
(a) Ascertain pins 1 and 3 of interconnecting cables are not reversed.
(b) Using an ohmmeter, check continuity between pin 1 and 3 of interconnecting cable. If a
reading is obtained on meter, cable is shorted and should be replaced.
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