REV.-A
Drive Transistor Short-circuit Check
During printing, the CPU continuously checks the
printhead
drive transistors (Q! to Q9) for short circuits.
The short-circuit check is performed between drive cycles. If any of the drive transistors are shorted,
a LOW signal is input to AN2 of the CPU. Upon receiving this signal, the CPU stops printing, shuts off
the +24 V drive voltage, and rings the buzzer. (See Figure 2-50.)
Bi-directional Printing Alignment
For
bi-directional
printing, printing position alignment is performed. The print timing pulse is delayed
when the
printhead moves from right to left, to align the vertical printing positions printed when the
printhead moves from left tot right with those printed right to left. If a misalignment occurs, it can be
adjusted using the control panel (Seee Section 4.3.3.).
2-63
To Next Page
Loading...
