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The DC controller judges the engagement/disengagement mechanism faulty and sends the
error message to the formatter when the T2SNS signal is not input/output within a specified
time during the engagement/disengagement operation.
Figure 5-52.
Secondary transfer roller engaging/disengaging detection
Color misregistration control
This controls the correction of color misregistration caused by the variation of cartridges and
the laser/scanner unit. In particular, this control corrects the following:
● Horizontal scan starting position
● Horizontal scanning scale
● Vertical scan starting position
The DC controller operates this control after a door is closed after replacement of a
cartridge, or a specified number of pages are printed after replacement of a cartridge, or a
command is received from the formatter.
The following is the sequence of this control.
1. The DC controller writes four colors’ misregistration detection patterns, the reference
pattern (right) and the pattern to be measured (left), onto the ITB.
174 Chapter 5 Theory of operation ENWW