Xerox Phaser 7700 Service Manual page 294

Grid 1-dot
This print is especially useful in the manual
process of registration when the automatic
process consistently fails due to excessive
process and lateral margin adjustment.
There are some printer/laser positioning
situations where the intrinsic error in lateral
margin offset is too great for the DC685-1
test to automatically compensate for, and a
manual adjustment is required. The
Adjustments/Calibrations Menu: Coarse
RegiCon Init Test is required to make these
adjustments manually before the DC685-1
test can pass. When the YMK vertical lines
are within 1-2 mm of the cyan line, DC685-1
should pass.
It is recommended that after doing the
Coarse RegiCon Init adjustments of the
lateral margin offsets, make another grid
1-dot print. There have been some printers
that corrupt the NVRAM and the lines do not
end up where you intended them to go. You
may have to experiment with a different
order of moving two or more lines to get the
desired results: all four colors within a 1-2
mm vertical "line."
S7700-29
Things to look for:
Mis-registration
9-271
Service Quick Reference Guide - Test Prints