User Guide

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Buttons: tests the key pad and other buttons.
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Touchscreen: tests the control-panel touchscreen.
For more control-panel diagnostics, see
Control-panel checks on page 77.
Half self-test
Perform a half self-test to determine which image-formation process might be malfunctioning.
NOTE: It might be easier to perform the print/stop test to stop the product during the printing process.
See
Print/stop test on page 108.
1. Print a configuration page from the control panel.
2. Open the cartridge door after the paper advances half-way through the product, which is about 3
to 5 seconds after the main motor begins to rotate. The leading edge of the paper should have
advanced past the toner cartridge.
3. Remove the toner cartridge.
4. Open the toner cartridge drum shield to view the drum surface.
If a dark and distinct toner image is present on the drum surface, assume that the cleaning,
conditioning, writing, and developing functions of the electrophotographic process are functioning
correctly. Troubleshoot the failure as a transfer or fusing problem. If no image is present on the
drum, perform the drum rotation test check. See
Drum rotation test check on page 110.
Drum rotation test check
NOTE: This test is especially important if refilled toner cartridges are in use.
The photosensitive drum, which is located in the toner cartridge, must rotate in order for the print
process to work. The photosensitive drum receives its drive from the main gear assembly. Use this
procedure to determine whether the drum is rotating.
1. Open the cartridge door.
2. Remove the toner cartridge.
3. Mark the cartridge drive gear with a felt-tipped marker. Note the position of the mark.
4. Install the toner cartridge, and then close the cartridge door. The start-up sequence should rotate
the drum enough to move the mark on the gear.
5. Open the product and inspect the mark on the cartridge drive gear.
Verify that the mark moved. If there was no movement, inspect the main gear assembly to make
sure that it connects with the toner-cartridge gears. If the drive gears function but the drum does
not move, replace the toner cartridge.
Component test (special-mode test)
This test activates individual parts independently to isolate problems.
110 Chapter 2 Solve problems ENWW