Tools for troubleshooting: Engine diagnostics
Engine-test button
The engine test produces a single-sided sheet with horizontal lines when you perform the engine test.
To perform the test, use a small-pointed object, for example a straightened paper clip, to push the engine
test button (accessed through a small hole in the rear cover). If the engine is functioning properly, the
product will initialize and then print the test page.
Figure 2-2 Engine test button access
Drum rotational check
The photosensitive drum, located in the toner cartridge, must rotate for the print process to work. The
photosensitive drum receives its drive from the main drive assembly.
NOTE: This test is especially important if refilled toner cartridges have been used.
1. Open the toner-cartridge door.
2. Remove the toner cartridge.
3. Mark the drive gear on the cartridge with a felt-tipped marker. Note the position of the mark.
4. Replace the toner cartridge and close the toner-cartridge door. The startup sequence should rotate the
drum enough to move the mark.
5. Open the toner-cartridge door and inspect the gear that was marked in step 3. Verify that the mark
moved.
ENWW Tools for troubleshooting 47
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