TM 5-3610-285-14
j. Be sure that vacuum bleed valve for loaded vacuum frame is closed.
k. Press master POWER switch, if not already on.
l. Press vacuum pump switch for loaded vacuum frame.
NOTE
Watch the effect of the vacuum on flat and plate. If air pockets form, release the vacuum by opening the bleed valve
and start again.
m. Wait for the vacuum to build up until needle reaches the green area of the gage (approximately 25 pounds).
n. Pull out on frame release knob and flip glass frame over to face exposure lamp and lock in place.
NOTE
"Units of light" or "light units" refers to the amount of light needed to expose a particular material. Following plate
manufacturer's recommendations for the specific type of plate used, and for the nature of the material being exposed,
will yield consistent, excellent results. Correct use of the sensitivity guide aids in determining and checking proper
exposure times. 30 units of light is a good starting point.
o. Press numerical keys on keypad to enter necessary units of light.
p. Verify that digital display reads correct units of light.
q. Press "T" key on keypad to activate the exposure. Verify that digital display counts down and that exposure
indicator lamp lights.
r. If a second plate is to be produced, repeat steps c - m to prepare second vacuum frame while first frame is
being exposed.
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