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7-74 Troubleshooting
Image System Troubleshooting
Half Self Test Functional Check
The electrophotographic process can be subdivided into the following
stages:
●
Cleaning (removes excess Toner from Drum surface)
●
Conditioning (places a uniform electrical charge on Drum)
●
Writing (laser strikes surface of Drum and creates latent image)
●
Developing (forms the Toner image on Drum)
●
Transferring (charge transfers the image to paper)
●
Fusing (heat and pressure produces a permanent image)
The purpose of the Half Self Test Check is to determine which stage
is malfunctioning. Perform the test as follows:
1 Print a Configuration Page from the Control Panel Information
Menu.
2 Open the Top Cover after the paper advances half-way through
the printer (about five seconds after the main motor begins
rotation). The leading edge of the paper should have advanced
past the Toner Cartridge.
3 Remove the Toner Cartridge.
4 Open 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), and troubleshoot the failure as a transfer or fusing
problem.
If no image is present on the Photosensitive Drum, perform all the
following functional checks.