Bi-D Adjustment Function; Interlock Function - Epson DLQ-3000 Service Manual

Operating Principles

2.3.6.1 Bi-D Adjustment Function

Bi-D adjustment is performed to align dots vertically for the Bi-directional printing. This is
accomplished by delaying the print timing pulse on which the carriage moves from the 136th
column to the 1st, using the print timing pulse when the carriage moves from the 1st to
136th column as reference. Since print timing pulse varies according to the carriage speed,
the adjustment should be implemented for each speed mode. For this printer, the
adjustment can be made for the 4-fold, 2-fold and the default speeds.

2.3.6.2 Interlock Function

The mechanical cover open switch is serially connected to the common (VPA) on the CR
motor. When the printer cover is open, the interlock function acts so that the motor does not
rotate.
2-25
Rev. A