Adjusting The Printer Mechanism; Platen Gap Adjustment - Epson LQ-300 Service Manual

4.1 ADJUSTING THE PRINTER MECHANISM

This section describes the adjustments you may need to make to the printer mechanism.

4.1.1 Platen Gap Adjustment

If
you have rotated or reassembled the CR guide shaft assembly or the parallelism adjustment
bushing, or if printing is abnormal, you must adjust the platen and the printhead.
1.
Set the release lever to the friction position.
Remove the upper housing assembly (see Section 3.2.1).
2.
Set the gap adjustment lever to O.
3.
Remove the printhead.
4.
Remove the ribbon mask with a pair of tweezers.
5.
Install the printhead.
6.
7. Adjust the platen gap using the flowchart below. The correct platen gap is 0.455 mm *
0.015 mm. When measuring the gap, take care to let the gauge fall between the platen and the
toward the platen using a screwdriver. To reduce the platen gap, turn the parallelism
adjustment bushing away from the platen.
S T A R T
YES
the
Is platen
gap correct on the
right
YES
Figure 4-1. Flowchart for Platen Gap Adjustment
NO
side?
Adjust the platen
Adjust the platen
gap on the right
side.
Is the
platen
gap correct on the
left side?
YES
Adjustments
NO
4-1