Epson LQ 300 - Adjusting the Printer Mechanism; Platen Gap Adjustment

LQ-300 Service Manual
Adjustments
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.
2.
3.
4.
5.
6.
7.
Set the release lever to the friction position.
Remove the upper housing assembly (see Section 3.2.1).
Set the gap adjustment lever to O.
Remove the printhead.
Remove the ribbon mask with a pair of tweezers.
Install the printhead.
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
printhead by gravity only. To inmease the platen gap, turn the parallelism adjustment bushing
toward the platen using a screwdriver. To reduce the platen gap, turn the parallelism
adjustment bushing away from the platen.
START
>
Adjust the platen
YES
Is the platen
NO
o ‘c
Adjust the platen
gap correct on the
gap on the right
right side?
side.
YES
L+
Is the platen
NO
gap correct on the
left side?
YES
X7
ND
Figure 4-1. Flowchart for Platen Gap Adjustment
Rev.A
4-1