6
EXPOSING
DETERMINING YOUR OPTIMUM EXPOSURE TIME
BY EXPOSURE CALCULATOR (PREFERRED METHOD)
1. Follow normal operations explained above.
2. Place exposure calculator on screen following calculator’s in-
structions.
3. Set timer to double the estimated exposure time.
4. Inspect your newly exposed screen according to calculator’s
instructions.
5. Multiply the previously set exposure time by number indicated
on the exposure calculator.
6. This new number is the proper exposure for your emulsion type.
Fill in the chart provided on page 7 of this manual as ready ref-
erence.
NOTE: This procedure should be followed for each new emulsion
type, new mesh count or mesh type (i.e. yellow, blue, white).
This procedure should also be followed periodically since the
lamp intensity will lessen with age.
BY TRIAL
1. Follow normal operations explained previously.
2. Inspect your newly exposed screen for proper exposure. Un-
derexposed: results in weak to washed out image with poor
emulsion adhesion and reduced resistance to printing inks and
wash up solvents. Overexposed: results in loss of fi ne detail.
3. Once you have determined the proper exposure for your emul-
sion type fi ll in the chart provided on page 7 of this manual as a
ready reference. This will save you time in the future.
NOTE: This procedure should be followed for each new emulsion
type or new mesh count. This procedure should also be fol-
lowed periodically as the lamp intensity will lessen with age.
11
MAINTENANCE
5. Install the correct replacement bulb. CAUTION: Do not touch
the lamp glass with your bare hands. Because of the intense
heat, impurities, such as fi nger prints and hand oils, can cause
premature failure of the lamp. If you are uncertain if the glass has
been touched wipe it off with a soft cloth moistened with alcohol.
6. Reassemble lamp wiring, lamp hold down clamps, false fl oor,
fan wires, new wire tie, and front panel. Plug unit into electrical
power. NOTE: Be sure all lamp electrical connections are tight.
VACUUM PUMP FILTER REPLACEMENT
WARNING: Unplug unit from electrical power and vent all air lines
to remove all air pressure.
Yearly inspection of the vacuum pump fi lters will increase the perfor-
mance and life of the pump. The fi rst inspection can be handled at
the time of the fi rst lamp change, check the cleanliness of the fi lter.
1. Follow steps 1 and 2 in Lamp Replacement Maintenance.
2. Locate vacuum motor and unscrew thumbscrew. (See fi gure
above)
3. Inspect fi lter felt material for dirt or debris. Wash with soap and
water if necessary. Pat dry with a paper towel.
NOTE: If fi lter cannot be cleaned replace it by contacting the pump
manufacturer for a service kit.
4. Reinstall fi lters on thumbscrew, slide into place, and tighten
thumbscrews.
Filter Felt
Thumbscrews
Vacuum Motor
To Next Page
Loading...
