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13-6
Trigger Board
A trigger board is provided in the light head to start the lamp. This board
operates on demand by sensing the lamp voltage. This board can be heard
when it is functioning, although the sound is faint. By turning the unit on
and off, the sound can be compared during trigger and cool-down. In
both situations, the fans are running full speed. The fans may be disabled
by pulling the blue wire from terminal #5 to aid in determining if the
trigger board is functioning. Use caution that the lamp doesn't run without
cooling.
The trigger board is located in the lamp head, in the end where the cable
enters. It is located in the cool air path inside the air plenum. One lamp
lead is in series with the trigger transformer [(1) input (3) output], the
other lamp lead (2) is used to sense the lamp voltage. Outside the unit,
the board can be tested by putting 350-750VAC between terminals [(1)
and (3)], and causing an arc from terminal (3) to terminal (1). This arc
should be .015 or greater.
TRIGGER BOARD #64MV414 FOR AL 84, AL 84-480 and AL 94
Capacitors and Level Switching
The capacitors pass all the current that flows through the lamp. They are
also used to switch power levels.
•
The capacitors for the AL 84, AL 84-480, AL 94, are divided into three
sections. All units have one or two idle capacitors, they are connected
with a yellow wire. High power capacitors are switched in during warm-
up and high power exposures. There are two high power capacitors
connected with a blue wire. All capacitors have an orange wire which
acts as a common.
•
The capacitors for high and medium levels are pulled in with relays during
warm-up and exposures. The medium relay will pull in to select medium
power. In this case the medium relay will also always pull in for high
power exposures.
•
The capacitors set the operating current of the lamp. If the lamp output
has changed rapidly, inspect the capacitors for swelling. The design of
M2
Lead to Lamp (3)
(High Temp Wire)
M1
Other Lamp Lead (2)
(Yellow Wire)
M3
Lamp Current (1)
(Violet Wire)
94MS42 Rev. B1 S/W Ver 2.06
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