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Phaser 8400/8500/8550/8560 Color Printer Service Manual 5-37
Print-Quality Troubleshooting
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The print indicates if the Printhead is producing properly-sized drops of ink
and that the Drum temperature is not too high.
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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.
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Check that the printer is not in High Resolution/Photo or Standard print
mode, and the Printhead drive voltage is set to the default 128.
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.
s8500-051
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Thin line
missing