3-40 Service Manual
5025-2xx, 4xx
Step 3: Develop
Once the laser exposes the photoconductor, the high-voltage power supply sends charge to the developer
roll (C). For each color, the toner cartridge engages the photoconductor so it applies toner to the surface.
Because of the charge difference between the toner on the developer roll and the electrostatic image created by
the laser, the toner will cling to the PC. The toner will only stick where the laser exposed the surface.
This process would be similar to using glue to write on a can and then rolling it over glitter. The glitter sticks to
the glue but won’t stick to the rest of the can.
Service tips:
• Never touch the surface of the developer roller with your bare hand. The oil from your skin may cause a
charge differential on the surface and toner will not stick properly. The result would be repeating blotches
of voids/light print on a page. Then the affected cartridge will have to be replaced.
• If the developer roll is damaged, it will not contact the surface of the photoconductor properly. The result
could be repeating marks, thin vertical voids or thin vertical lines of color on the printed page. Check the
surface of the developer for damage.
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