SkyTracker STX-1-2000 - Primary Transformer; Igniter Transformer; Spark Gap and Related Components; DC Power Cables

6.1.1 PRIMARY TRANSFORMER
The Primary Transformer receives an input pulse when either the autostrike assembly or
the manual start button is actuated, and raises this voltage to approximately 6,000 V.AC,
50/60 Hz. If replacement is required, it may be easily removed by unplugging the two (2)
pin input connector, disconnecting the single output wire from the capacitor and removing
the two (2) screws which hold it to the right hand Plenum Support Bracket.
CAUTION
Thistransformeriswoundwithalargenumberofverynewindingsandis
subject to “burn-out” if, for any reason, the input power is supplied for longer
than two seconds.
6.1.2 R.F. “IGNITER” TRANSFORMER
The R.F. (Radio Frequency) Igniter Transformer is specially constructed transformer that
provides an ignition pulse of 40,000 volts when the output of the Primary Transformer is fed
through its primary winding to a grounded spark gap. The negative (-) DC power from the
power supply is fed through the secondary winding of the R.F. transformer to the lower (or
cathode) end of the xenon bulb.
6.1.3 SPARK GAP AND RELATED COMPONENTS
Other components of the Igniter System include a spark gap, a “door knob” capacitor,
and various smaller capacitors and “R.F. Traps.” Figure 8 illustrates the location of these
components.
6.2 DC POWER CABLES
TheexiblecablesthatcarrytheDCpowerfromtheBaseAssemblytothelampheadenter
through the baseplate. The positive (+) input cable is attached at an interconnect point to a
similar cable within the lamphead connected to the upper bulb support spider. The spider in
turn carries the DC positive (+) power through jumper cables then to the upper bulb adapter
which is attached to the front or anode (+) end of the xenon bulb.
The negative (-) DC input cable is attached directly to one end of the R.F. transformer. A
short,exiblecablethenconnectstheotherendoftheR.F.transformertotheendofthe
bulb, which is the cathode (-) end of the xenon bulb. This cable and all components be-
tween the output side of the R.F. transformer and the xenon bulb must be well insulated
and maintained at least one inch from any “ground” or conductive components of the lamp-
head, in order to prevent shorting and/or loss of ignition energy to the bulb.
6.3 COOLING BLOWERS
One or two cooling blowers, depending on the lamphead wattage, are attached to a
squareplenum,whichdistributesairtothelampandrearofthereectorandalsopro-
vides support for the base (cathode end) of the lamp. Access to this plenum and the base
end of the bulb is achieved through removal of four screws securing a cover plate to one
side of the plenum.
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