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