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Hi, my experience with this machine is that the gear that drives the black pcu breaks or cracks. Usually caused by the pcu being too hard to turn. I always turn the developer gear in the pcu before installing it just to loosen the toner.
One of the most common reasons for a Lanier 5222 or 5227 to make dark copies is a problem with the drum unit or developer. Fortunately on those machines, the drum unit and developer are all self-contained in one easily-replacable unit, called the PCU (photoconductor).
If you don't have a new PCU handy, you can order one from the same company you get your toner from. The PCU should generally be replaced every 60,000 copies, but sometimes it may need to be replaced sooner (especially if you run a lot of dark copies or make a lot of copies of images) and it can often run longer than 60,000.
Replacing the PCU is easy -- it sits right next to the toner bottle, and all you have to do is slide the old PCU out and slide the new PCU in (once you remove all of the tape and other trappings from it). Instructions will be included in the box with the new PCU.
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sc363 is a yellow PCU error. Try replacing the toner cartridge and resetting the PCU. If the error comes back, you'll probably need to replace that yellow PCU.
Sorry, You do not need Black toner, you need a Black PCU (Photo Conductor Unit). I have this same printer with the same warning. Unfortunately, This unit seems to be rather expensive. Good Luck
as if the cartridge is new.and colour is printing fine.then its not faulty cartridge or faulty printer.and yes you are absolutely right that it needs proper servicing.in the printer there are lens one lens is for colour and one lens is for black.if there is dust on the lens controlling black you will get lines and patches in black prinouts.but yes if the drum is got lines on it.that it will give same lines in the printouts.also you can get the drun serviced first before getting the printer serviced.a local printer repair shop does this drum servicing.also there comes a liquid to clean drum.you can get it from printer parts store.if want to do manually.but the shop will get it checked after serving in there printer.so it will be confirmed that is it drum or faulty /dusty lens in the printer.
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this will help.thanks.
You could remove the color and black&white drum units and check from below the units to visually observe lines on all the 4 drums. If so, you have to change the drum unit/units. Drums occassionally get damaged before life this way due to solid toner particles inside the toner bottle.Always "shake the toners very well" before replacement, and if you print rarely, then remove the toners and do the shaking to prevent clogging due to inactivity.
Most of the time when I find this happening on a printer, not just Ricoh's it turns out to be the PCU (photo conductor unit). The color PCU is one unit and the black is a seperate unit. Hope this helps.
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