Toner Cartridge; Laser/Scanner Section; Toner Transfer Section; Fixing Section - Canon FAX-L350 Service Manual

4.1 LASER/Scanner Section

This section comprises a LASER unit, cylindrical lens, 4-faced polygon mirror, scanner motor, imaging lens,
reflection mirror and BD unit. The LASER is driven in accordance with the LASER drive signals that are sent
from the PCNT board. This LASER light passes through the cylindrical lens to fall on the 4-faced polygon
mirror that is rotating at a fixed speed. The LASER light is reflected from the 4-faced polygon mirror and
passes through the imaging lens, and reflects from the reflection mirror to scan the photosensitive drum in the

toner cartridge.

4.2 Toner Cartridge
This cartridge comprises the primary charging roller, developing cylinder, photosensitive drum, cleaner blade,
and toner.
The LASER beam from the LASER/scanner section forms a latent static image on the photosensitive drum
that is charged by the primary charging roller. The photosensitive drum rotates inside the toner cartridge, and
rotation of the developing cylinder causes toner to adhere to the photosensitive drum to form a visible image
which is then transferred to the recording paper at the toner transfer section. Residual toner is then removed
from the surface of the photosensitive drum by the cleaning blade.

4.3 Toner Transfer Section

This section comprises the transfer charging roller and the static eliminator. The recording paper passes be-
tween the photosensitive drum and the transfer charging roller, and the transfer charging roller is charged with
a charge opposite to that of the toner to transfer the toner on the photosensitive drum to the recording paper.
The charge on the rear side of the recording paper is then removed by the static eliminator.

4.4 Fixing Section

This section comprises the fixing ass'y and pressure roller. The fixing section on this machine is an on-
demand system that uses fixing film with low thermal capacity.
The toner that was transferred to the recording paper at the toner transfer section is fused to the paper and fixed
as a permanent image.
The fixing ass'y has a built-in fixing heater and thermistor. The fixing temperature is controlled by the printer
controller on the SCNT board.
FAX-L350 Chapter 2: Technical Reference
2-13