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KODAK 1200i WIDE-FORMAT PRINTING SYSTEM
Technical Training Guide 68
2. Humidifiers
- The addition of a humidifier can solve print output problems where relative humidity
(Rh) is too low (i.e. <30% Rh) and/or when mild grounding problems exist.
The addition of a humidifier can reduce the effects of ESD on printed output.
If the humidity in the printing area is increased and the above symptoms
disappear then a grounding issue/ESD problem is likely present, but not
severe. If the addition of a humidifier solves the problem permanently then no
further action may be necessary unless premature cartridge failures occur.
NOTE: Even with adequate grounding measures
intact, relative humidity should typically be between
45% and 55% in a normal room temperature environment for the
best printing results (ESD suppression and color control).
The suggested temperature range is 68-72 degree F. (20-22.2
degrees C.)
3. Ant-Static Mats
- The installation of Anti-Static mats below the printer have
been known to help control ESD levels in the space on and
around the printer.
3. Air Plenum Grounding
- In low humidity environments static build-up can
occur across the air plenum and generate ESD levels
which may interfere with printed output (mainly during
dryer operations) if the air plenum is not completely
grounded. Verify air plenum is thoroughly grounded by
placing a voltmeter into a resistance scale and check
electrical resistance between the Y-Arm assembly and
the air plenum (connect to any screw). The normal
resistance level should be 0.6 ohms or less but may
vary depending on position of air plenum.
- If the electrical resistance between the Y-
arm assembly and the air plenum is
greater than 0.6 ohms then verify the
ground strap between the right side of air
plenum and the dryer mounting bracket
(black) is connected. Perform resistance
test across grounding strap while air
plenum is in the UP and DOWN positions.