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6.5 Test and Adjustment Functions for Maintenance
The DL9300/9400 provides the following test functions for adjustment and checking at maintenance:
6.5.1 Self-diagnostics
Self-diagnostics prints test pattern pages without using the computer. The operator or maintenance personnel
can easily check electrical and mechanical states of the printer. If there are printing errors, self-diagnostics
distinguishes between printer errors and computer errors. It is also used to confirm correct operation after error
recovery.
6.5.2 Hexadecimal dump
The DL9300/9400 prints received data, including commands, in hexadecimal, which is especially helpful if a
software problem occurs.
6.5.3 Vertical alignment
Full lines of vertical bars are printed bidirectionally. This enables fine adjustment between forward and
backward printing so that vertical bars of each print line form straight lines. This adjustment is necessary for
printing vertical ruled lines or graphics.
6.5.4 Print position adjustment
The top of the paper, left print start position, and line spacing pitch (when using cut sheets) are adjusted for the
first print line when paper is loaded on the platen. This adjustment depends on the top margin specified by
application software. The fine adjustment is necessary for formatted or ruled paper.