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Functional tests
Engine test
The purpose of the engine test is to determine which image-formation process is malfunctioning. The
image-formation process can be divided into the following stages:
Conditioning stage (charges the drum)
Writing stage (writes a latent image to the drum with the laser)
Development stage (forms a toner image on the drum)
Transfer stage (transfers the image to paper)
Separation stage (separates the media from the drum)
Fusing stage (applies heat and pressure to make the image on paper permanent)
Cleaning stage (removes excess toner from the drum)
The engine test switch is inside tray 1, on the left side, just below the front cover.
To print an engine test:
1 Turn off the device.
2 Turn on the device.
3 Open tray 1 and load paper.
NOTE If tray 1 is empty, the device will not perform an engine test. You cannot perform
an engine test from optional tray 2.
4 Press the engine-test switch (shown below).
NOTE The formatter must be connected to the power supply cover plate to perform an
engine test. Otherwise, the device does not print the engine test.
Figure 6-1 Location of the engine-test switch
The device prints an engine-test page that contains four columns of horizontal lines, with each
column corresponding to one of the print cartridge colors.
ENWW Functional tests 295
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