User guide

EN Functional checks 201
Half self-test functional check
The electrophotographic process can be subdivided into the following
stages:
 image formation stage (charges the drum and 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)
 cleaning stage (removes excess toner from the drum)
 fusing stage (applies heat and pressure to make the image on
paper permanent)
To perform a half self-test check
The purpose of the half self-test check is to determine which process
is malfunctioning.
1 Print a self-test page. (See “Troubleshooting tools” on page 209.)
2 Open the print cartridge door after the paper advances halfway
through the printer (about five seconds after the motor begins
rotation). The leading edge of the paper should have advanced
past the print cartridge.
3 Remove the print cartridge.
4 Open the print cartridge drum shield to view the drum surface. If a
dark and distinct toner image is present on the drum surface,
assume that the first two functions of the electrophotographic
process are functioning (image formation and development).
Troubleshoot the failure as a transfer or fusing problem.
To perform other checks
If there is no image on the photosensitive drum, perform these
checks:
1 Make sure you removed the entire length of the sealing tape from
the print cartridge before you installed the cartridge.
2 Perform a drum rotation functional check. (See “Drum rotation
functional check” on page 202.)
3 Perform a high-voltage power supply check. (See “High-voltage
power supply check” on page 204.)