Specifications

Troubleshooting Print Quality Problems - 9
P-7 Horizontal Streaks
Step Actions and Questions
Action
(When There Is Problem)
Toner cartridge
Is the problem solved by replacing the toner cartridge with a
new one?
Replace the toner cartridge.
Drum ground
Is the toner cartridge drum grounded securely?
* Check the drum ground path: drum > drum shaft pin >
Restore the continuity of the
drum ground path.
Charging
Use a sheet of paper to cover the window through which the
laser beam is emitted from the laser/scanner assembly.
Does the problem still occur?
Replace power supply
assembly. If problem
persists, replace DC
controller board.
Charging and development
Is the toner image on the drum normally developed?
* Switch off the printer power while the development is in
progress, and visually check the toner image on the drum (the
area upstream of the transfer step).
Replace power supply
assembly. If problem
persists, replace DC
controller board.
Transfer roller assembly
Are there foreign objects or contamination on the roller
portion of the transfer roller assembly?
Replace the transfer roller
assembly.
Fuser heater roller and fuser pressure roller
Are there scratches, contamination, or foreign objects on the
fuser heater roller or the fuser pressure roller?
Replace the roller.
Problem
There are black lines running horizontally across the page.
Initial Analysis
Inspect the following components. Are they compatible with your printer ver-
sion, correctly installed, not damaged, deformed or contaminated, or free of
foreign objects sticking?
• Toner Cartridge • Power Supply Assy • Transfer Roller Assy
• Mirror Assembly • Laser/Scanner Assy • DC Controller Board
• Fuser Assembly • Fuser Pressure Roller • Static Eliminator
• Top Cover