Xerographics - Xerox VersaLink B7025 Service Manual

Xerographics

Overview
The Xerox® VersaLink® B7025/B7030/B7035 employs a direct transfer monochrome print
engine, which utilizes the xerographic process described below:
1. Charge: A negative charge is uniformly distributed over the surface of the photoreceptor
drum by a bias charge roll (BCR).
2. Expose: A laser print head (LPH) creates a latent image on the photoreceptor drum by
exposing it with a laser beam emitted from a semiconductor laser.
3. Develop: Toner is transported from the toner cartridge to the drum cartridge and via the
magnetic developer roll onto the photoreceptor drum. The toner particles are attracted to
the latent image that was formed on the photoreceptor drum by the exposure process.
4. Transfer: The bias transfer roll (BTR) transfers the toner image from the photoreceptor
drum to the surface of the paper.
5. Clean: The surface of the photoreceptor drum is cleaned by a cleaning mechanism
located within the drum cartridge.
NOTE: . The print engine employs the "Write Black" xerography principle; when develop-
ing the image, the discharged areas of the photoreceptor drum attract toner.
The print engine uses the following components in the xerographic process, refer to
• Toner cartridge (customer replaceable unit).
• Toner dispenser assembly.
• Drum cartridge (customer replaceable unit).
• Laser Print Head (LPH).
• Bias Transfer Roller (BTR) (customer replaceable unit).
• HVPS.
Figure 1 Main xerographic components
Launch Issue
Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
Toner Cartridge
The toner cartridge is a customer replaceable unit (CRU) with sufficient toner capacity for up to
30 000 feeds. Refer to Figure
The toner cartridge does not include a toner empty sensor. Toner level is monitored by a com-
bination of feedback from the automatic toner control (ATC) sensor and pixel counting. The
machine monitors toner level and informs the user when it reaches these states:
• Pre-Near End-of-Life: the toner cartridge is approximately 25% full
• Near End-of-Life: the dispense motor is on but the ATC sensor detects no increase in
toner in the drum cartridge.
• End-of-Life: the ATC sensor detects no toner in the drum cartridge. The machine hard
stops at this point.
NOTE: The toner cartridge is a CRU and is not serviceable.
Figure 1.
April 2017
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2.
Figure 2 Toner Cartridge
Product Technical Overview