Half-Self Test Functional Check
The electrophotographic process can be subdivided into the following stages:
• Cleaning (removing excess toner from drum surface)
• Conditioning (placing a uniform electrical charge on drum)
• Writing (laser strikes surface of drum to create latent image)
• Development (formation of the toner image on drum)
• Transfer (charge to transfer the image to paper)
• Fusing (heat and pressure to produce a permanent image)
The purpose of the Half-Self Test Check is to determine which process is
malfunctioning. Perform the test as follows:
1 Initiate a self test.
2 Open the Printer Door after the paper advances half-way through the printer (about
8 seconds after the 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.) Troubleshoot the failure as a
transfer or fusing problem.
If NO image is present on the photosensitive drum, perform the following functional
checks:
1 Make sure you have removed the entire length of the sealing tape from the toner
cartridge before you installed the cartridge.
2 Drum Rotation Functional Check.
3 High Voltage Power Supply Check.
7-22 Troubleshooting
