CHAPTER VI
MAINTENANCE
6-1. GENERAL.
This chapter contains general maintenance procedures at the system level for the
XR Series 500 Watt Marine Searchlight.
NOTE
All service and/or installation work on Xenon Searchlights
should be preformed by a Qualified Marine Electrician!!
6-2.
DETAILED FUNCTIONAL DESCRIPTION Using 110 VAC Power Supply.
This functional analysis
is provided to aid the technician in troubleshooting the XR Series 500 Watt Marine Searchlight. The
searchlight is comprised of a Power Supply assembly A1, searchlight head assembly A2, remote control
panel A3, and remote current meter A4. Refer to Figure 9304 5-B for searchlight schematic diagram.
The searchlight operates from a 115 VAC, 60 Hz power source which is applied through a 20 ampere cir-
cuit breaker A1CB1 to transformer A1T1. Transformer A1T1 secondaries are tapped for 24, 80 and 120
VAC.
Transformer A1T1 provides 80 VAC to full wave rectifier A1CR1. The full wave rectifier rectifies the 80 VAC
and initially charges filter capacitor A1C1 to a level dependent upon load. Under minimum load (main con-
tactor A1K1 de-energized or xenon lamp A20S1 not conducting), the main DC operating voltage will
charge capacitor A1C1 to approximately 80 VDC; under maximum load (main contactor A1K1 energized
and xenon lamp A2DS1 conducting), the main DC operating voltage will charge capacitor A1C1 to
approximately 20 VDC. Transformer A1T1 provides 24 VAC to full wave rectifier A1A2CR1 which is recti-
fied to provide relay control power. The 24 VDC is also used for control of beam width.
Transformer A1T1 provides 115 V to chopper assembly A1XA1 which is used to produce the 30 KV pulse
ignite voltage for the xenon lamp A2DS1.
When main contactor A1K1 is energized, approximately 80 VDC is applied between the anode and cath-
ode of xenon lamp A2DS1. The 80 VDC is also used to energize AC ignite relay A1K2, through the volt-
age regulator network consisting of dropping resistor A1A2R1 and 50V regulating zener diode A1A2CR2
in parallel with isolating diode A1A2 CR1 and capacitor A1A2C1. The voltage regulator network along with
the DC resistance of the ignite relay A1K2 and capacitor A1A2C1 form an auto start-up circuit to ignite the
xenon lamp automatically when remote control panel STANDBY/ON/IGNITE switch A3S1 is positioned to
on. The auto start-up circuit functions when ignite relay A1K2 is energized and capacitor AlA2C2 begins to
charge. Capacitor A1A2C2 after approximately 40 ms or 1RC time constant causes the voltage across
ignite relay A1K2 to drop below 20 VDC, de-energizing the relay. Capacitor A1A2C2 will stay charged as
long as the main contactor A1K1 is energized and will discharge through resistor A1A2R5 when the main
contactor A1K1 is de-energized.
The searchlight is controlled from the remote control panel (A3) which consists of STANDBY/ON/IGNITE
switch A3S1, POWER ON lamp A3DS2 and VARIABLE BEAM WIDTH control switch A3S2. The STAND-
BY/ON/IGNITE switch is a two position STANDBY/ON switch with a momentary IGNITE position. With
STANDBY/ON/IGNITE switch A3S1 in STANDBY, POWER ON lamp A3DS1 is off and main contactor
relay A1K1 and elapsed time meter/blower fan relay A1K3 are maintained de-energized by removal of
ground return through switch A3S1. With main contactor relay A1K1 de-energized, main DC operating and
ionization power is removed from the anode of xenon lamp A2DS1. During STANDBY, capacitor A1C1 is
charged to 80 VDC by the 80 VDC supply and 115 VAC is provided for operation of blower fans A1B1 and
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