MPC 6500 7500 Blowing toner

[msaeger]

Back to the machine. The D014 has that nice stupid closed space between the blades where anything that wears of the lube bar is just stuck there. The B132 had 2 brushes, sure, but it only had 1 blade, and anything in the entire cleaning station could make it to the waste auger (or on top of the lube bar and make it a nice mess to change)

I am pretty sure this will not work but maybe I will be proven wrong. I tried it today on a MPC7500. I replaced the CMY charge rollers, lube bars, and upper cleaning blades I left the lower one out. They made a couple hundred copies then started getting a cyan line. The line was on the drum and on the charge roller. So I pulled of the charge roller and upper blade with the holder and there was a pile of toner building up under there already and a lump on the cleaning blade. I cleaned the blade and the charge roller and the drum appeared to be getting cleaned off. I the watched while they printed 3200 color copies with no lines so we will see but I am not that hopeful after the failure so quickly.

I didn't think about it until now but this thing is really backwards is there an other model that has the brush after the cleaning blade ? They really should have the brush below that lower blade.

What is different about the black vs the colors ? just the lube blade holder ? I never see that pile of toner between the cleaning blades on black.

[Shadow1]

The obvious difference between the K and CMY drums is the charge corona on black, but that shouldn't have anything to do with the buildup. The only other difference I know of is weaker springs on the lube bar. I really don't think the buildup is toner - it seems to be mostly lube with just enough toner dusted in to color it.

Did you swap in the K springs on your test unit? I've also tried using the D082 charge rollers on the D014 machines - They appear identical physically, but it is a different part number (not that that really means much) and I guess it's possible they put some sort of a coating on them. It would do my heart good if I knew they gave the engineer who designed it a bottle of NuFinish and told him to polish up a million of them because a tech had an idea that did more to help than anything he designed.

I'm seriously thinking about drilling "vent holes" in a good supply of drum blades and the mounting plate so the buildup can drain through it - maybe that would work. Its a pain to have to do that, and keep modified parts on hand, but I got major pissed customers I have to think about.

[msaeger]

On a different machine I tried the black lube bar springs that didn't go long until lines showed up. I have just been trying one mod at a time but maybe I need to gang up the mods. I checked out the one I took the cleaning blades out on today and there were no lines but they have only made about 100 prints since yesterday.

The black unit also has a different plate with the cleaning blade that is at a different angle.

I figured the D081 charge rollers are the same and they just changed the number. The service manual does say they are different though. I ordered a D014 ITB and that number was replaced with a D081 one.

On black I never see that pile of toner between the blades and that unit has the same lube bar / brush so what is causing it on the color ones ?

[Shadow1]

But it doesn't have the same lube bar springs - like I said, I think that pile of buildup is mostly excess lube powder just enough toner to make it colored. I didn't know the cleaning blade was at a different angle. May have to try swapping those too - This is turning into a bigger experiment that I'd hoped for, but they run so poorly its worth it.

[msaeger]

I didn't know the cleaning blade was at a different angle.

I think that is what is different anyway you will have to look at the plates and see what you think. The plate top cleaning blade goes on is different between the cmy and k they have them marked and there are different numbers. I am just guessing it makes the angle of the blade different after comparing them a little bit.

[msaeger]

I am pretty sure this will not work but maybe I will be proven wrong. I tried it today on a MPC7500. I replaced the CMY charge rollers, lube bars, and upper cleaning blades I left the lower one out. They made a couple hundred copies then started getting a cyan line. The line was on the drum and on the charge roller. So I pulled of the charge roller and upper blade with the holder and there was a pile of toner building up under there already and a lump on the cleaning blade. I cleaned the blade and the charge roller and the drum appeared to be getting cleaned off. I the watched while they printed 3200 color copies with no lines so we will see but I am not that hopeful after the failure so quickly.

I didn't think about it until now but this thing is really backwards is there an other model that has the brush after the cleaning blade ? They really should have the brush below that lower blade.

What is different about the black vs the colors ? just the lube blade holder ? I never see that pile of toner between the cleaning blades on black.

They are up to 8500 now and have no lines.

[Shadow1]

I'm hoping it was just a fluke getting that line as soon as you put it back together. Keep us posted.

I've been fortunate in that I haven't had one of these darken my door since I posted my last idea, so I haven't been able to experiment... I've probably just jinxed myself.

[msaeger]

Count update now 17K no lines.

[Shadow1]

Without getting my hopes up...


Encouraging, but what was the count average between failures before the mod?

[msaeger]

Not really sure for any specific one they all seemed to be 20K to 50K. I think this one was about every three or four weeks. I won't get excited until I do it on another one. It seems like they fail quicker in the winter too.

This one let me take out the cyan cube bar and solved the problem but as soon as I did that on another one it killed the drum. (now it has all the lube bars in)

[msaeger]

Today the count is 20K with no lines.

[Dusty]

I did a k pcu pm, a ptr pm, and a belt cleaning unit today on a 3260. Machine has 350k black, 250k cmy so far. Would not have done these pms at all yet, except the xfer ate a label and mangled the blade, and put label goo all over the ptr.

The sad thing was it was as clean inside as it was when it was new. I have 3 of these 3260's and each of my 6000/7500s have more calls this year than all the 3260s combined.

[Dusty]

I have a problem D015 that I took the cams out of a couple of months ago. Today I had to put them back on - K, M, and especially C were packed full of dev, and spraying toner throughout the machine. Yellow was fine.

[msaeger]

31,000 no lines.

[Shadow1]

How's it looking now and where's the meter?