impact EX-100A, Instructions Manual

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Flash Output
The flash power output is variable over a three
f/stop range (four f/stops) from full power to 1/8
power in a stepless gradation. Flash power is
adjusted by rotating the power-regulator knob on
the back panel of the unit. The EX-100A will sound
a beep and the green indicator will light when the
unit has recycled and is ready to flash.
Lowering Flash Power
While raising the flash power requires no special
consideration, lowering the power does. Excess
power that has built up in the system’s capacitors
must be released. You must press the red test
button to manually “pop” the flash after a
power-lowering adjustment. The EX-100A will
then recycle to the lower power you’ve selected.
A beep will sound and the green indicator will
light when the unit has recycled and is ready to
flash again.
Caution: To avoid eye damage, do not look into the
strobe while firing. Do not fire the flash in close
proximity to the face. Turn the unit off and unplug
the power cord when changing attachments.
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Flash Settings Changing the Fuse
10M 25M 50M 75M 100M 10Y 25Y 50Y 75Y 100Y
A 6.3A fuse is mounted in the rear panel and protects the circuitry of the flash unit. Turn
off the unit and disconnect the power supply before changing the fuse. Never replace
with a fuse of a different type or rating. A spare 6.3A fuse has been included with your
EX-100A monolight. Use a small screwdriver to release the fuse cover. Remove the old
fuse, place the new fuse in the slot, then replace the fuse holder.
Manually “pop” the flash when
reducing flash power. This will
flush the excess power in the
capacitors.