Konica Minolta C7000 toner not sticking to paper (one side)

[Honpress]

Hi!

I have a another problem with our printer Konica Minolta C7000. Really happy I fixed most of the problems, but can't have a break of course.

When I make a print the toner isn't sticking on 1 side on the paper, I can wipe most of the paper. I've added o photo of the print and the fuser belt (see that the toner is still on it especially what created the thick toner missing streak on the print)

Like it's not heating on one side? I don't get any error also. I've replaced the fuser belt a while back, bought it from Alibaba (compatible, but not original one). Sometimes something smells weird when the printer is on. No idea if it's the belt or one of the rolls. Don't know if that has anything to do with this problem. But at the same time I've the idea the fuser is getting too hot??

I had a look at the fuser unit lamp, seems OK. The thermistor was really dirty almost black, don't know why so I cleaned that. Not sure if cleaning it is good enough.. The thermistor is on the side, where the toner isn't sticking. Don't know if that matters.

I really hope somebody can help me with this! ?

Ilse

[Synthohol]

id put a slice of paper between the rollers, turn the pressure motor to close the gap and make sure there is even pressure on both sides.
the upper bearing looks a bit dark from heat too.
check the web and web roller.

[copyman]

Agree with synth it looks like fuser bearing or bushing on one side is bad. Which means there will be a space between rollers preventing proper fusing.

[wjurls]

Do as suggested above. If that doesn't help, you may have a buildup of silicon oil on either the upper, lower or both rollers inside the belt. I've had this oil buildup cause some strange image quality issues. If that's the case, Don't waste time cleaning them. Just replace the rollers and belt.

[Ziggy]

When you replaced the fuser belt did you also replace the rollers inside of belt? If not that may be your problem. But I agree with post above, looks like either a bearing is not sitting right or one of the heat sleeves is broke

[blackcat4866]

When you replaced the fuser belt did you also replace the rollers inside of belt? If not that may be your problem. But I agree with post above, looks like either a bearing is not sitting right or one of the heat sleeves is broke

On a machine this old it is very common to find broken bushings, or bearings not properly seated, or the shoulder screws not properly seated in the split frame, all of which affect how much pressure you're getting at each side. Examine those items more closely.

[Honpress]

Hi everyone! Thank you for your responses! Don't know how to tag (if possible) names in this message.?

I got out the fuser unit and it was clearly visible that the 2 upper rolls with belt were slanting (if that's the correct word for it). The fuser bearing somehow popped out of his 'fitting' (see picture).

bearing.jpg

Couldn't see anything what caused this, no loose screws anywhere... Or someone knows what it could have been?
So I put the roll with bearing back in place and added some screws around it to hold it in it's place, so it won't pop out that way again. Don't think it will hurt? For now the problem is solved

[Synthohol]

that bearing color and ick on the belt thats what ive seen a bunch of times.
ive seen toner build up on the web slowing that side of the belt making the bearing work harder till it fails in one way or the other.
happy to see its an easy fix.
just to ask, was there a chunk of toner on the web? i hate that, it burnishes the belt and toner just starts sticking like DV to a mag roller

[Ziggy]

Hi everyone! Thank you for your responses! Don't know how to tag (if possible) names in this message.?

I got out the fuser unit and it was clearly visible that the 2 upper rolls with belt were slanting (if that's the correct word for it). The fuser bearing somehow popped out of his 'fitting' (see picture).

bearing.jpg

Couldn't see anything what caused this, no loose screws anywhere... Or someone knows what it could have been?
So I put the roll with bearing back in place and added some screws around it to hold it in it's place, so it won't pop out that way again. Don't think it will hurt? For now the problem is solved

I believe the bearings have a metal ring on them to hold them in place. If you put them on backwards they will pop out of place

[Ziggy]

I believe the bearings have a metal ring on them to hold them in place. If you put them on backwards they will pop out of place

Looking at your picture and parts manual looks like you do have the bearing on the lower of the belt on wrong. attaching page from parts manual Edit to add look at item 17

[Honpress]

that bearing color and ick on the belt thats what ive seen a bunch of times.
ive seen toner build up on the web slowing that side of the belt making the bearing work harder till it fails in one way or the other.
happy to see its an easy fix.
just to ask, was there a chunk of toner on the web? i hate that, it burnishes the belt and toner just starts sticking like DV to a mag roller

Hi, as Markks said it were the bearings on that lower roll which were placed wrong! Really stupid, probably happened when I replaced the fuser belt and put them on wrong (the same way like the upper roller bearings) I always make photo's when I take something a part, but guess I didn't see it, while it's pretty obvious..
Should be happy the whole thing still works, only the upper roll is pretty messed up on one side, but outside the printing area.

But what do you mean with web? When you say 'just to ask, was there a chunk of toner on the web?'. Sorry if that's a dumb question ?

[Honpress]

Looking at your picture and parts manual looks like you do have the bearing on the lower of the belt on wrong. attaching page from parts manual Edit to add look at item 17

Thank you! It indeed were the bearings put on backwards, really dumb! Obviously they would pop out like this... So fixed that and thank you for the technical drawing? I have 2 manuals of the C7000 but none of these drawings.

[Synthohol]

But what do you mean with web? When you say 'just to ask, was there a chunk of toner on the web?'. Sorry if that's a dumb question ?

you're not dumb, im dumb.for some reason i thought the 7000 still had a fuser web. like the 1200, looking at the burnish stripe on the belt is a clear indicator on other models that there is a chunk of toner trapped behind the web scraping the belt.
21 months from the last copier i fixed im mixing my models up.
my apologies for the confusion.

[Ziggy]

Thank you! It indeed were the bearings put on backwards, really dumb! Obviously they would pop out like this... So fixed that and thank you for the technical drawing? I have 2 manuals of the C7000 but none of these drawings.

No ones dumb, we all learn from and help each other out. If you are ever in doubt on how things go back together refer to the parts manual . It will usually show you the correct orientation of most parts.