Xerox Phaser 8400 Service Manual page 233

Test Print Examples (Continued)
4: Reverse Text
The print indicates if the printhead is producing
properly-sized drops of ink and that the drum
temperature is not too high.
NOTE This print should be made with the
printer covers closed and in place. The
heat loss without the covers can hide the
"too-hot" thermal problem. Also print the
test print in Enhanced print mode.
Look for: Legibility in the lines of 6-point text;
particularly in the primary colors. If the letters
are closed or badly "plugged" with ink, the
printhead is laying down too much ink. A good-
quality print shows five vertical parallel lines of
different thicknesses on the left and right side of
the print. If the thinnest line is missing, the
printhead is outputting too much ink or the drum
temperature is too high.
Causes: Check the thermal regulation of the
printhead and of the drum. Make sure that the
drum temperature sensor is correctly mounted
and in proper, even contact with the drum. If
necessary, remove the sensor and check it for
an accumulation of debris at its contact point.
Replace the drum temperature sensor.
Ensure the printhead drive voltage is set to the
default 128. Ensure the printer is not in High
Resolution/Photo or Standard print mode.
5: Big Bands OHP
This print allows you to evaluate transparency
printing. It prints two transparencies from
Tray 1, one with primary color fills and one with
secondary color fills and a band of 50% blue, as
this is a popular background color for overhead
transparencies.
Look for: Scratching on the print. Uniformity of
fill with no scratching.
Evaluate the print on an overhead projector.
Some print artifacts visible on the print do not
show when projected. Likewise, some defects
do not show until projected.
Causes: Confirm that you are using the
transparency that is supported for this printer.
Clean or replace the paper release blade. For
more information about scratches, see
"Scratches Parallel to the Long Axis of Printing,
Particularly with Film" on page 5-20.
5-8
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
1234567890
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
Thin line
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
missing
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
10 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890
8 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
6 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
5 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
4 point Times-Roman ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*
Phaser 8400 Printer Service Manual
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