Piper Arrow IV Turbo Maintenance Manual page 428

REMOVAL OF STROBE POWER SUPPLY.
The strobe power supply is in the aft section of the fuselage.
1. Remove access panel to the aft section of the fuselage in the rear baggage compartment to gain access
to power supply.
2. To remove power supply disconnect the electrical plugs. (One to four plugs depending on installation.
Make note of the placement of the plugs to facilitate reinstallation.)
3. Disconnect the other electrical leads.
Make note of the placement of the leads to facilitate
reinstallation.
4. Remove the four screws securing power supply to the fuselage. Power supply can now be removed.
INSTALLATION OF STROBE POWER SUPPLY. (Refer to Figure 33-2.)
1. Position the power supply in place and secure with the four screws previously removed.
2. Reconnect the electrical leads in their proper place.
3. Reconnect the electrical plugs previously removed in their proper place.
4. Replace access panel in rear baggage compartment.
TROUBLESHOOTING PROCEDURE.
The strobe light functions as a condenser discharge system. A condenser in the power supply is charged to
approximately 450-volts DC then discharged across the Xenon flash tube at intervals of approximately 50
flashes per minute. The condenser is parallel across the Xenon flash tube which is designated to hold off the
450-volts DC applied until the flash tube is triggered by an external pulse. This pulse is generated by a solid
state timing circuit in the power supply.
When troubleshooting the strobe light system, it must first be determined if the trouble is in the flash tube
or the power supply. Replacement of the flash tube will confirm if the tube is defective. A normally operating
power supply will emit an audible tone of 1 to 1.5 KHZ. If there is no sound emitted, check the system
according to the following instructions. When troubleshooting the system, utilize the appropriate schematic at
the back of this section.
1. Ascertain the input voltage at the power supply is 14-volts.
When disconnecting and connecting the power supply input
connections, do not get the connections reversed. Reversed
polarity 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.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—NOTE—
—CAUTION—
2G5
33-40-09
Page 33-09
December 1, 1978