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Image Formation Troubleshooting
Half Self-Test Functional Check
The electro-photographic 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 Initiate an 05 SELF TEST.
2 Open or switch OFF the printer after the paper advances
halfway through the printer (the leading edge of the paper
should advance at least past the Transfer Charge roller).
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
electro-photographic process are functioning, 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.
• The Drum Rotation Functional Check.
• High voltage Power Supply Check.
Troubleshooting 7-49