Troubleshooting
Half Self Test Functional Check
Half Self Test Functional Check
The electrophotographic process can be subdivided into the
following stages:
Cleaning (Physical and Electrostatic).
● Conditioning (Primary Charge Roller).
. Writing (Laser Modulation).
● Development (Formation of the Toner Image).
. Transfer (Charge to transfer the image to paper).
The purpose of the Half Self Test Check is to determine which
process is malfunctioning. Perform the test as follows:
1.
2.
3.
4.
Initiate a printer front panel self test.
Open the printer’s Top Door after the paper advances half-way
through the printer (about ten seconds after the Main Motor
begins rotation). The leading edge of the paper should have
advanced past the toner cartridge.
Remove the toner cartridge.
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 three functions of the electrophotographic
process are functioning (conditioning, writing and developing - see
chapter
5), and troubleshoot the failure as a transfer problem.
If NO image is present on the photoconductive drum, perform the
checks shown on the following pages.
7-39
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