iR105 with grey background

[OtherTech]

I have 2 105's that have gone quite dark. Have put in new chargers and reduced DENS to 2 or 3 but copies and prints still on the dark side. Not sure what the best approach is? Any suggestions. Have done CCD adjust.

[Kopyrtek]

You may want to start by polishing the drum.Clean or replace all coronas...then go from there.Alot of times it is just the coronas that need to be replaced.

[OtherTech]

Thanks, new chargers included corona's. What do you suggest to polish the drum with?

[Kopyrtek]

Canon has a powder you mix with alcohol and make a paste with.Works ok but i have used Brasso before and seems to work just as well.Will look for a part # if you need it.

[Kopyrtek]

CK-0429-000 is the part # for the drum powder.

[OtherTech]

Thanks, have used toner before. (had a xerox product but it dried out)

[Oze]

Canon has a powder you mix with alcohol and make a paste with.Works ok but i have used Brasso before and seems to work just as well.Will look for a part # if you need it.

Works just as well if you mix it with water.

[srv]

I had this problem a few months ago and polishing the drum with brasso sorted it.{new advertising idea for brasso} it's not just for knobs and knockers you know!

[yourownfree]

Why did both do it? Maybe its a toner issue, like the wrong stuff.
I think you are going about it all wrong. You need to start with door specs, check to make sure someone hasn't tweeked on them. Then check your lamps and mirrors. You might think why, but the light to the drum sets up a reference voltage for the drum for all others to adjust by. Then check your corona wires. did someone rewire them? If so did they get the wire in the proper place on the proper side of the grooves on the blocks and corona height adjusters. Check the height of the wires. make sure the primary grid is clean, windex actually will cut the ozone crud off and look great. Is there toner on the registration guide? if so the pretrans assy needs cleaned. Best if you restring all the corona wires if they are questionable.New units will resolve or at least eliminate the possibility as stated earlier.Whats the counters say in service mode? Is the drum heater turned on? Turn it on it helps, but wont resolve the problem now.Dot on switch in back of copier toward frame is on. if the drum cleaning blade craps out, it will give streaking and background which usually gets progressively worse as more copies are made. In which case polish the drum and then replace the blade at the same time. Clean all filters front and back of machines always, and make sure the transport belt fan holes are clean. This aids in separation, just thought I'd throw that in. shouldn't have to mess with density, leave it centered or put it back and just fix the problem. There is a possibility you lost separation and a piece of paper is up in the cleaning assy, or even one wrapped around the fixing assy roller for that matter. seen that before. for a test you can turn potential control off and see what your copies look like. You could stop the copies at the transport and see if they still are cruddy so you can eliminate the fixing as a problem. You have to narrow down the problem by eliminating possibilities until you reach the problem. Start with the basics first before you dive in and polish a drum. My apologies othertech if i said anything that sounds stupid or offending. I can see you have a vast amount of knowledge, and looks like you are an expert on irc3200's and know how to make drums last. I know who to ask for help on those babies now.

[OtherTech]

Thanks for your comments, you are right about the wrong toner possibility as these machines are currently using Katun toner. We have identified in the past that when Canon toner is mixed with Katun toner this is the result while both brands are in the system. I have cleaned the filters and adjusted Primary wire heights already. Turning potential control off does make the output very light. Still think buffing drums good idea.

[yourownfree]

make sure primary grid wire is clean also or it will give you a mess. check the transfer guide settings, also fuzzy setting. where i live lower number works better. Also check to see if trans-sep setting in service mode is set properly. 0 works best for me, even though it is recycled paper. Its the setting for recycled paper. also check in additional mode register paper type, is it correct? Then head for the dev bias adjustment. Change to a higher value to remove background, that is after you polish drum and replace cl blade. I wouldn't rule out the laser, but since you have two its kinda fishy that toner is issue. Might have to compensate for that.

[OtherTech]

Primary chg is new, Set Fuzzy to 1 (for low humidity, usually about 10% here),Trans/sep voltages at door values, Not sure what you mean about transfer guide? (or setting in service mode) Played with DC bias a bit, wasn't quite sure (solids did get lighter) Does paper type affect voltages (currently set to plain)

[yourownfree]

sorry i didn't get back with you. register paper type does make an effect since it sets up a different set of parameters. also the enviro sensor controls charge, dev, etc. I had one i fought forever. they would always run ncr paper non approved of course.It would gum up the drum, had to clean the drum, replace the duplex reverse roller for swelling, yeah it would send 11x17 paper crooked in its path and catch on return to the duplex guide. I know not your problem. But same machine, drove me nuts. i put in a new improved updated cleaning assy, might try that. I had new corona assys in it, just could not figure it out. finally one day i said the heck with it and adjusted the dev bias until the background went just away. the one setting i forget what it is now, but there about three. I think it was around 200 or 180 then i raised it up a bit to get rid of the background. I would also, i know sounds wrong, but an optic cleaning and white plate cleaning. I made that mistake. also do ccd adjust. anyhow what does that have to do with just printing to copier. It sets the reference point for the copier settings when it adjust itself. up to that point i had never thought about that. I think that solved a problem of the same nature either there or somewhere else, once i realized why. The transfer guide setting is for humidity too. its like trg-sw or something like that. stands for transfer guide switch. Probably not your problem anyway.
I would not rule out a dirty slit glass since that is part of the reference process. look at the voltage in the dark and light readings before and after cleaning the white plate etc. What is it like with pot control off? Believe it or not i was so furious and headed for last resort i measure the pot control board pot with machine off (so i could put it back) then tweeked on that to change pot control. not recommended though. This machine has been working great now for a couple of months with no background problems. So conclusion i think was really the dev unit and optical area cleaning and adjustment. as for the pot adjustment, didn't seem to anything. I was digging for answers so if i was to change its value i would know if it was the problem or not. I am not a tweeker so to speak, but on occasion i will beat the system. Canon sent me a nasty letter one time for modifying the timer circuit not to shut off but allowed the e codes to shut off. Said it changed the ul listing code and was a no no. so i haven't done anything stupid for a while. Yeah somebody squealed on me. Hope some of this helps you. Maybe even check enviro sensor, never had one go out to my knowledge though. I just clean them. with air. I also used a ir 5000 cl blade on this machine to solve the cleaning issue, and increase the cl blade pressure slightly. Now it works with the proper cl blade. Oh and make sure the cleaning assy cleaning roller is turning, one way on front and gear in rear of assy. I also adjust the mylar in the assy, three screws, to clean the metal roller off like a pretrans assy does. seems to me thats what it should do. cant think of anything else, except maybe toner is not the correct stuff.

[roygunawan]

I have experience on this kind of machine. This machine sensitive to the mixed toner. If you mix some brand of toner, usually the copies of this machine will have grey background. So you must clean the developing assembly and put the right toner to this machine. In my country, there are a lot of toner brand but not only a few brand that have a good result.

[yourownfree]

good point. I dont see much of that at all where i work, since all toner needs to be legit Canon toner or they cannot be on a contract. Thats because if they dont use legit toner and have a copy quality problem, then they are not covered by the contract and they will have to pay for the service call and repair. I have seen that before but its been awhile.roygunawan is right about what was said. If that is so you will have to clean out the dev unit and start over. then sell them the good stuff.