Service Guide
105
X-axis scale adjustment
This adjustment sets the gain or rate-of travel of the printhead’s x-axis movement.
Perform this adjustment:
■
To correct thin, parallel pin stripes running the length of the page,
appearing evenly-spaced across the width of the page (not due to a
weak or missing jet).
■
Anytime the NVRAM chip (Phaser 840 printer) or BootROM/Printer ID
chip (Phaser 850 printer) is replaced
■
Anytime an X-axis component is replaced.
1.
Allow the printer to warm up to its idle, “Ready to Print,” state.
2.
Enter the “hidden” service menu by scrolling to the
Troubleshooting
menu and pressing Select. Then press and hold the Left arrow button
and, while holding the Left arrow button, press Select.
3.
Scroll to the service menu item
Test Prints
and press Select. Choose
the test print
1: X-axis Motion
and press Select to print it.
4.
Interpret the second of the two X-axis motion prints. The print features
four purple columns, each containing a jagged black band. The black
bands should all align horizontally with each other.
5.
If an adjustment is needed, scroll to the menu item
Set X-axis Scale
.
Change the displayed value to a new value, if necessary, as indicated by
the test print
6.
Select the menu item
Print X-axis calibration pattern
to verify
the adjustment. Repeat the adjustment, if necessary.
Adjusting the x-axis scale adjustment
0388-67
Increase scale
adjust to raise
center bars
Correct
Decrease scale
adjust to lower
center bars
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...