Adjustments, Maintenance, and Lubriition
Bidirectional Alignment Adjustment
This section describes how to adjust the bidirectional print position to ensure correct printing.
Overview of the Bidirectional Alignment Adjustment
The FX-870/1170 prints characters when the carriage moves from both from left to right and
from 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
alignment correction differs for each printer. Also, the correction value must be written to each
E2PROM,
and it must be rewritten after each adjustment.
Bidirectional Alignment Adjustment Procedure
The FX-870/1170 has a built-in bidirectional adjustment program. Follow the steps on the
next page to adjust the bidirectional alignment.
Epson FX-870/1170
5-3
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