Service manual

REV.-A
f
:,”
. . . . . .,
LEVER, G, ADJUST
\
Figure 4-1. PARALLEUSM ADJUSTMENT BUSHING
4.2 Bidirectional Alignment Adjustment
This section describes how to adjust the bidirectional print position to ensure correct printing.
(
-,
4.2.1 Overview of the Bidirectional Alignment Adjustment
..-
The FX-870/l 170 prints characters when the carriage moves from both left to right and right to left. Therefore,
the printing in one direction must be correctly aligned with the printing in the other direction. Otherwise,
printed vertical lines may be staggered.
It is important to readjust the bidirectional alignment whenever anything has been done to the gear
arrangement of the printer mechanism that might affect this alignment. The bidirectional alignment can be
adjusted by altering the timing in which the carriage moves from one end to the other.
Since no two printer mechanisms are manufactured exactly the same, the bidirectional misalignment
correction differs for each printer. Also, the correction value must be written in each E* PROM, and it must be
rewritten after each adjustment.
4-2