Epson 2070 - LQ B/W Dot-matrix Printer Service Manual page 116

LQ-2070 Service Manual
9. Insert a thin screwdriver into the drilled hole at the right edge of the rear CR guide shaft
and adjust the platen gap by moving the screwdriver forward or backward until the gap is large
enough for a 0.38 mm thickness gauge but too narrow for a 0.41 mm thickness gauge.
10. When the gap is correct at the 5th column, check the platen gap at the 80th, and then the 130th
column positions.
11. If the platen gap is wider at the 5th column than the 130th column, adjust the parallelism for the
rear CR guide shaft by moving the parallelism adjustment bushing backward. If the platen gap is
more narrow for the 5th column than the 130th column, adjust the parallelism of the CR guide
shaft by moving the parallelism adjustment bushing forward. Refer to the following figure.
Figure 4-4 Adjusting the Parallelism of the CR Guide Shaft
12. Continue performing adjustment steps 8 to 11 until the platen gap is correct at all 3 positions.
After completing the adjustment, remove the screwdriver from the rear CR guide shaft.
13. After inserting the ribbon mask in the ribbon mask holder and installing the printhead into CR
assembly, tighten the 2 CBS screws (3 × 8,F/Zn) to attach the printhead.
14. Tighten the hexagon nut (standard, M4) securing the PG adjust lever.
Rev. A
Figure 4-3 Platen Gap
Adjustment
4-3