PRESS 1052 line

[blackcat4866]

Here's the best part: per the enduser, it only occurs about every 5000 pages!

From the samples, the line is always 32mm from the leading edge, in the crossfeed direction.

The closest I could get to the 32mm interval was at the fuser inlet guide. I'm guessing that occasionally a page levitates over the transfer belt, and when the page hits the bite of the fuser rollers, the page briefly touches the top inlet guide.

The interval is not right for the drum claws. Has anybody seen this one? =^..^=

Line on PRESS 1052.JPG

[wseyller]

Re: PRESS 1052 line

5,000 lmfao. And I thought my day was hell.

I notice it happens exactly at the spot where it starts laying down toner for the image. Is that just a coincidence?

[allan]

Re: PRESS 1052 line

Look at the voided areas around the lettering. Its monetary arching or loosing charge?
Is it in the same position every time. Its probably happening more often than 5000 pages that is probably the only pages that gets noticed.

[blackcat4866]

Re: PRESS 1052 line

5,000 lmfao. And I thought my day was hell.

I notice it happens exactly at the spot where it starts laying down toner for the image. Is that just a coincidence?

It's just a coincidence. Every sample is at 32mm.

Look at the voided areas around the lettering. Its monetary arching or loosing charge?
Is it in the same position every time. Its probably happening more often than 5000 pages that is probably the only pages that gets noticed.

Possibly arcing. Yes always exactly 32mm from the leading edge, and usually the first page of a stapled set. But arcing where, to what?

This machine does between 25K and 30K a day, so that's ~6 events per day. Maybe more. Oh yes, 2.5M prints and rising daily.
My enduser said that they stopped using this machine because of the problem, yet did 70K in 3 days on said machine. =^..^=

[Zackuth]

Re: PRESS 1052 line

I've just fought a similar problem on a 1051. Replaced charge grid and wires. The voids around the prints as Allan pointed out lead to this fix.

[allan]

Re: PRESS 1052 line

Its one of those inspector Cluzo cases.
Is that the first page of a stapled set regardless of the page count per set. I would intentional bump the machine to see if i can recreate it.
Thinking that the stapler could cause a jitter is way out there.

I feel your frustration.

[blackcat4866]

Re: PRESS 1052 line

I've just fought a similar problem on a 1051. Replaced charge grid and wires. The voids around the prints as Allan pointed out lead to this fix.

I'll do the wires and grid Monday (yes they called back).

Its one of those inspector Cluzo cases.
Is that the first page of a stapled set regardless of the page count per set. I would intentional bump the machine to see if i can recreate it.
Thinking that the stapler could cause a jitter is way out there.

I feel your frustration.

like you, I can't imagine the stapler causing a jitter from a meter away. Not enough samples to be very sure of anything. =^..^=

[JR2ALTA]

Re: PRESS 1052 line

My instructor said it is very common for end users to turn of the main power before turning off the subpower. The subpower allows for a gradual temp reduction that can last as long as 30 minutes.

He warned this action will cause toner to harden and cake up in the transfer cleaning area resulting in image issues, noises and a heck of a clean up.

just a thought

[blackcat4866]

Re: PRESS 1052 line

My instructor said it is very common for end users to turn of the main power before turning off the subpower. The subpower allows for a gradual temp reduction that can last as long as 30 minutes.

He warned this action will cause toner to harden and cake up in the transfer cleaning area resulting in image issues, noises and a heck of a clean up.

just a thought

It's worth looking at. Thanks Junior. I'll take it apart and see what's there. On the sister machine it frayed the rear side of the transfer belt at 1.6M, so I've been in there. Curiously, the belt still walks a little to the rear, and I doubt it will meet a 12M yield expectation. =^..^=

[Mick01]

Re: PRESS 1052 line

Hi,
I would check the earthing of the fur brush inside the cleaning unit. I have had issues on the previous models where the shaft needs to be cleaned that drives the fur brush roller that caused similar problems.
hope this helps.

[blackcat4866]

Re: PRESS 1052 line

Hi,
I would check the earthing of the fur brush inside the cleaning unit. I have had issues on the previous models where the shaft needs to be cleaned that drives the fur brush roller that caused similar problems.
hope this helps.

Thanks Mick. I changed the fur brush recently, but cannot remember exactly what the grounding looked like. Do you know how this translates into the 32mm interval from the leading edge? A reasonable guess might be that the discharge during a previous cleaned image cycles around to overlay the next page ...

On recollection, there is a roll pin drive at the rear. And at the front a white plastic bearing holder, felt seal, bearing, gear, and clip. If there is a ground contact, it must a spring clip in the front or rear imaging drawer frame. There was no black grease that I can recall seeing. I'll check that. =^..^=

[Mick01]

Re: PRESS 1052 line

Hi,
The earthing is through the rear shaft bearing. The drive shaft gets dirty (and even wears where it goes through the bearing). I recommend every time the fur brush roller gets replaced that the shaft is pulled out, inspected and cleaned. I am unsure about the process at the 32mm lead edge interval, I can only assume that with the increased resistance on the roller you are getting drum neutralising issues. sorry my explanation is a bit vague, I specialise on our colour devices normally and dont get involved much with B&W problems.

Again hope this helps.

[blackcat4866]

Re: PRESS 1052 line

OK, so here are my observations.

Primary: There was some light toner dusting on both sides of the grid, and light ozone coating on the housing. Replaced primary wires and grid.

Cleaning Unit: Like most rolling ground contacts you don't see a steady reading. When I started I found:
0.02 Ω ground to inner roller
0.55 Ω ground to the brush
After the addition of conductive grease and a few shims I got:
0.02 Ω ground to the inner roller
0.06 Ω ground to the brush

Transfer Unit:
I think I found something here:
3.0 Ω ground to the driven roller
2.0 Ω ground to the transfer roller
0.6 Ω ground to the belt idler
After the addition of conductive grease and a few shims I got:
0.06 Ω ground to the driven roller
0.6 Ω ground to transfer roller
0.5 Ω ground to belt idler

There was noticeable toner dusting on the bottom of the drum claw guide (which I had cleaned only a few days before). My theory is that is where the image is getting smudged: pre-fusing. It only seems to occur on the 2nd side printed (or the first side image of the originals), and now can be seen on every page of a set (naturally in the samples only. I still can't get it to present for me).
Ordinarily I shun the shotgun approach to troubleshooting, but I'm getting tired of this machine kicking my ass. And it won't present the symptom for me anyway. Time will tell.

Thanks for the help. =^..^=

[blackcat4866]

Re: PRESS 1052 line

Callback again, but this time the lines are considerable more faint. The drum claw guide remained clean.

I thought I'd take a different approach today. Since it's affecting duplex copying/printing, I thought perhaps I might find some unfused toner dumped in the inverter path, and getting picked up while inverting. The inverter was packed with paper dust, and a dozen shreds of paper from previous jams, but no toner. Some of it is fairly easy to clean, but the area under the fuser is inaccessible without a total teardown. As a compromise I took a heavy transparency, wrapped it with a stretch-N-dust, and rolled it through the inverter path. The rollers and sensors cleaned up easily.

Not really expecting to see the problem I ran 120 duplex. Toward the end of the test I did start to see the faintest hint of the line.

My plan "B" for today was to swap the transfer belt assy with the sister machine across the isleway to see if I can move the problem. After the swap both machines ran 300 duplex without the symptom. We'll know for sure tomorrow, when they will print another 30K. If it's truly gone, I'll replace the bad transfer belt assy. I would like to know exactly what was causing it, but enough is enough. =^..^=

[blackcat4866]

Re: PRESS 1052 line

It was the plan "B" that bore fruit. I created the issue on the sister machine, so the transfer belt assy is part of the problem. It took 5 days for it to come back to the original machine. I interpret that to mean that the transfer cleaning unit is suspect also.

As a plan "C" I see that there are HVT contacts to the transfer cleaning unit. Maybe HVT next? =^..^=