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4.5.34: Printhead to Platen Gap Alignment – Figure - 4.15.
Platen alignment must be done with great care to achieve maximum print quality and
printhead performance. Care must be exercised to avoid damage to the platen surface and
printwires while setting the printhead-to-platen gap.
1.
Push the printhead adjustment lever toward the platen into the first detent position.
2.
Tighten the platen bolts (92) to where the platen can still move but will stay where
repositioned.
3.
With the carriage positioned at the left margin, adjust the platen position until a gap
of 0.012" +/- 0.001" exists between the tips of the printwires and the platen surface.
This measurement should be made from above the printhead with a flat feeler gage. Edges
of the gage should be deburred to avoid scratching the platen.
4.
Move the carriage to the extreme right margin and again adjust the platen
position for a 0.012"+/-0.001" printhead-to-platen gap.
5.
Repeat steps 3 and 4 until the same gap exists across the entire surface of the
platen.
6.
Carefully tighten the platen bolts (92) by alternating from one end to the other to
minimize platen movement due to tightening.
7.
Recheck gap measurements.
8.
Once all four bolts (92) have been secured, use a torque wrench to apply a torque of
115 in-lb. (inch-pounds) to each bolt.
4-35
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