HP 6L pro, 6L Gold manual Half self-test functional check, Drum rotation functional check

Half self-test functional check

The electrophotographic process can be subdivided into the following stages:

lCleaning (removing excess toner from drum surface)

lConditioning (placing a uniform electrical charge on drum)

lWriting (laser strikes surface of drum to create latent image)

lDevelopment (formation of the toner image on drum)

lTransfer (charge to transfer the image to paper)

lFusing (heat and pressure to produce a permanent image)

The purpose of the Half Self-Test Check is to determine which process is malfunctioning. Perform the test as follows:

1Initiate a self-test.

2Open the Printer Door after the paper advances half-way through the printer (about eight seconds after the Motor begins rotation). The leading edge of the paper should have advanced past the toner cartridge.

3Remove the toner cartridge.

4Open the toner cartridge’s drum shield to view the drum’s surface.

If a dark and distinct toner image is present on the drum’s surface, assume that the first four functions of the electrophotographic process are functioning (cleaning, conditioning, writing and developing - see Chapter 5.) Troubleshoot the failure as a transfer or fusing problem.

If NO image is present on the photosensitive drum, perform the following functional checks:

1Make sure you have removed the entire length of the sealing tape from the toner cartridge before you installed the cartridge.

2Drum Rotation Functional Check.

3High Voltage Power Supply Check.

Drum rotation functional 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. To verify whether the drum is rotating:

1Open the Printer Door.

2Remove the toner cartridge.

3Mark the cartridge’s drive gear with a felt-tipped marker. Note the position of the mark.

4Install the toner cartridge and close the Printer Door. The start-up sequence should rotate the drum enough to move the mark.

5Open the printer and inspect the gear that was marked in step 3. Verify that the mark moved.

If the mark did not move, inspect the Main Drive assembly to ensure that it is meshing with the toner cartridge gears. If the drive gears appear functional, and the drum does not move, replace the toner cartridge.

Note This test is especially important if refilled toner cartridges have been used.

134 Troubleshooting EN