Xerox 7142 Service Manual page 154

5 Self-Diagnosis Mode
3. Check the printed repeatability adjustment patterns for the following points.
* The pattern is printed with Bk row only.
(The following shows a case for repeatability adjustment Low 1)
A. Media feed direction
B. Adjust the setting value so that the printed dots are aligned at this connecting point.
* Also for repeatability adjustment Low 2, High 1 and High 2, perform adjustment using the same
procedure.
* Detail on B is as follows. Make an adjustment so that the size of the gap A below is smaller than the
half size of the dot.
4. If any abnormal conditions are found, identify the difference between the CW printing position and the
CCW printing position and enter the difference as the repeatability adjustment parameter.
Details of circled area
Printing
direction
Printing
direction
5-36
RJ-901C/RJ-900C Maintenance Manual
1-3
C
B (upper circle above)
Printing
direction
B (lower circle above)
Printing
direction
Assumed center
position A
Gap A
Assumed Center
Position B
A