d. Lift up fin tip and disconnect electrical plug.
e. Pull Strobe light assembly out of fin tip, electrical plug will pull up through hole in middle of.mounting
plate.
11-70. INSTALLATION OF FIN TIP STROBE LIGHT.
a. Insert new electrical plug down through hole in mounting plate and position strobe light assembly in place.
b. Position lens in place.
c. Secure lens to mounting plate by the clamp previously removed.
d. Reconnect electrical plugs underneath fin tip.
e. Replace fin tip and secure with appropriate screws.
11-71. REMOVAL OF STROBE POWER SUPPLY. The strobe power supply is in the aft section of the fuselage.
a. Remove access panel to the aft section of the fuselage in the to gain access to power supply.
b. To remove power supply disconnect the electrical plugs. (one to four plugs depending on installation.).
c. Disconnect the three other electrical leads.
—NOTE—
Make note of the placement of the leads to facilitate reinstallation.
d. Remove the four screws securing power supply to fuselage. Power supply can now be removed.
11-72. INSTALLATION OF STROBE POWER SUPPLY. (Refer to Figure 11-25.).
a. Position the power supply in place and secure with the four screws previously removed.
b. Reconnect the three electrical leads in their proper place.
c. Reconnect the electrical plugs previously removed, in their proper place.
d. Replace access panel in rear compartment.
11-73. 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 5O flashes per minute. The condenser is parallel across the Xenon flash tube
which is designed to hold 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.).
a. 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. 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-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
ELECTRICAL SYSTEM
2E1
