Canon fax basic 2000 サービスマニュアル

RECORDING SECTION

4–46

4.7

Toner Cartridge

Fig. 4-56 shows the structure of the toner cartridge. This toner cartridge

contains the primary charging roller, photosensitive drum and developing

cylinder.

Fig. 4-56   Structure of Toner Cartridge

Next, let’s describe the types of toner cartridges and toner detection meth-

ods used in facsimile products.

• Antenna sensor method

The developing cylinder and antenna sensor are electrostatically joined.

When a voltage is applied to the developing cylinder, a voltage is also gen-

erated to the antenna sensor. The voltage generated to the antenna sensor

changes according to the amount of toner.  Toner is judged to be absent

when the amount of toner falls and the output voltage of the antenna sensor

falls below a certain stipulated value.

• LED method

Light is irradiated on a photo-transistor on the outside of the cartridge from

the LED under the cartridge. Toner is judged to be absent when the output

voltage of the photo-transistor falls below a certain stipulated value.

Cartridge Type

Toner Detection Method

FX-V/FX-VII

Antenna sensor method

FX-1/FX-2

LED method

FX-3/FX-4

Magnetic sensor method

Photosensitive drum

Waste toner
container

Cleaner blade

Developing cylinder

Toner container

Blade

Primary charging roller