Image System Troubleshooting Half Self Test Functional Check The electrophotographic process can be subdivided into the following stages: G Cleaning (removes excess Toner from Drum surface) G Conditioning (places a uniform electrical charge on Drum) G Writing (laser strikes surface of Drum and creates latent image) G Developing (forms the Toner image on Drum) G Transferring (charge transfers the image to paper) G 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.
7-74 Troubleshooting