HP IIISi: "50 SERVICE"

Hi It is the cartridge but not the photo sensitive drum. This is almost 100% caused by the PCR ( primary charge roller ). If the Photo drum fails, it is missing toner or fading text. The PCR is deep inside the cartridge but can be replaced. They normal go for around $10 someplace. I'm told that one can clean them but I've not tried it. It is a rubber like material and is suppose to carry the charge off the photo drum. There is also a scrapper that can fail. If it gets junk in it, it will let toner get by and contaminate the PCR. It is a self intensifying process. The more the PCR get contaminated, the more gets by the scrapper. More that gets by, the more that builds on the PCR, the less it is able to remove charge, the more builds on the drum. There is normally a thin flim of toner on the drum. This is normal. One needs to learn how to open the cartridges. I also have a 4SI ( used to have a 3SI ). These use the Canon NX cartridge. After searching the net, I finally found these pages showing how to open the cartridge: http://sklepamm.super.sklep.pl/pdf/NXTechGuide.pdf In picture 1 they show a special tool to remove the plastic pin. I found a screw that just goes into it and a pair of pliers works well( I forget the screw size ). Also look at: http://www.futuregraphicsllc.com/lit/tg/nx.pdf Remember, don't touch any of the surfaces with fingers. The oil will mess things up. Dwight ---------------------------------------- _________________________________________________________________ Windows Live? Hotmail??more than just e-mail. http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t2_hm_justgotbetter_how…