Troubleshooting
Adjustment Procedures
Beam-to-Drum Mirror Adjustment
The mounting for the Beam-to-Drum mirror has an adjustment on
the right end to correct for potential image skew problems. The
mirror is adjusted at the factory for new units, but can lose its
-setting if the mirror is removed for any reason, or if the
adjustment screw has been loosened.
To adjust the Beam-to-Drum Mirror:
1.
2.
3.
4.
5.
6.
‘7.
Run a test print (an “Engine Test,” described earlier in this
chapter, or another self test print, described in Chapter 3).
Use a pencil or pen to draw a horizontal line across the top of
each vertical line on the test print image (see Figure 7-7).
Place the edge of a tool with an exact 90 degree corner(such as
a drafting triangle) along the leftmost vertical line of the test
print image, and draw a second horizontal line across the top of
the page.
Measure the error between the lines drawn in step 2 and step 3
(see Figure 7-8). If the distance is greater than 1.5 mm, then
adjustment is needed.
On the right end of the mirror assembly, note the current
adjustment setting (if necessary, make a mark on the printer
body and/or adjustment scale), and loosen the adjustment screw.
Shift the mirror toward the front of the printer to move the
image up on the right, or toward the back of the printer to move
the image upon the left.
Run another test print, repeating the above steps until the
image skew is within tolerance.
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