Canon FAXPHONE L75 Service Manual

Also see for FAXPHONE L75: User guide Specifications Setup sheet Software user's guide

Contents

Canon FAXPHONE L75 Service Manual Manual pdf 52 page image

2-11LASER CLASS 1060P Chapter 2: Technical Reference4.1 LASER/Scanner Section ÆÆÆÆÆ See Page 2-12This 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 sentfrom the SCNT board. This LASER light passes through the cylindrical lens to fall on the 4-faced polygonmirror that is rotating at a fixed speed. The LASER light is reflected from the 4-faced polygon mirror andpasses through the imaging lens, and reflects from the reflection mirror to scan the photosensitive drum in thetoner cartridge.4.2 Toner Cartridge ÆÆÆÆÆ See Page 2-12This 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 drumthat is charged by the primary charging roller. The photosensitive drum rotates inside the toner cartridge, androtation of the developing cylinder causes toner to adhere to the photosensitive drum to form a visible imagewhich is then transferred to the recording paper at the toner transfer section. Residual toner is then removedfrom the surface of the photosensitive drum by the cleaning blade.4.3 Toner Transfer SectionThis 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 witha 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 ÆÆÆÆÆ See Page 2-13This 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 andfixed as a permanent image.The fixing ass’y has a built-in fixing heater and thermistor. The fixing temperature is controlled by the printercontroller on the PCNT board.4.5 Paper Feed/Eject Section ÆÆÆÆÆ See Page 2-13After toner is fixed in the fixing section, the recording paper is fed to either the face-up delivery slot or theface-down delivery slot that is switched by the flapper. The user selects the setting of the flapper by the paperdelivery selector at the bottom left of the front panel.All rollers from paper feed through paper ejection are driven by the main motor.