Xerox Phaser 7700 Service Manual page 144

If RegiCon Coarse Skew Fails
This indicates that the horizontal alignment is so far out of adjustment that a
manual adjustment is required before the diagnostics test routines for fine skew
can pass. Other possible problems; a Mark-On-Belt Sensor failure, Developer,
Developer Bias Voltage, Print Cartridge, or Engine Control Board Failure.
Perform the Coarse RegiCon Initialization procedure on page 4-125. This
adjusts the horizontal alignment closer and allows RegiCon #4 to pass.
After Coarse RegiCon Initialization is complete, perform RegiCon #4
(Coarse Skew Adjustment) again. Make the required adjustments.
Note Adjustments should be made only if the skew correction indicated
is greater than +/- five clicks. A positive number indicates
clockwise (CW) adjustment is needed. A negative number
indicates a counter-clockwise (CCW) adjustment is needed.
Adjustment screws are located behind the Waste Cartridge, which
must be removed for access. From left to right, the adjustment
screws are: K, C, M, and Y.
Service Quick Reference Guide - Adjustments & Calibration
4-121