Machine Overview; Firmware; Print Engine; Paper Feed Mechanism - Ricoh BP20 Service Manual

6.2 MACHINE OVERVIEW

6.2.1 FIRMWARE

The machine firmware controls the printing process.

6.2.2 PRINT ENGINE

Paper Feed Mechanism

The paper feed mechanism consists of the following:
1) 250 sheet paper feed unit
2) By-pass tray
3) Pick-up rollers, friction pads and feed rollers.
Together with sensors in the feed path, these mechanisms serve to control paper
registration and guide the paper through the image transfer, image development,
image fusing and exit assemblies. The paper path has an anti-static connection to
ground, which eliminates paper feed problems due to static charge on the paper.

Drive Mechanism

The main drive mechanism uses a 2-phase motor. It drives the OPC, paper pick-
up, and paper feed rollers using a gear train mechanism.

Laser Scanning Unit

The machine uses the laser scanning unit (LSU) of the mechanism to create
images on the OPC drum.
Laser Scanning Unit
The machine uses the laser scanning unit (LSU) of the mechanism to create
images on the OPC drum.

Development Unit

The development unit adds toner to the latent image on the OPC drum.

Fusing Unit

The fusing unit bonds the toner image onto the paper. This is achieved with a
temperature controlled heating unit.
SM 6-5
MACHINE OVERVIEW
G144/G145