Curve the corners - MP 5002

[UNICORNico]

Hello colleagues.


I have this curious case in an MP 5002, which has been installed for quite some time and for about 15 or 20 days, has begun to curve the corners. Sometimes only one, in others it is two corners.
I discard impurities prior to the arrival of the paper in the areas of Fusion Unit, of the Rollers of the Registry, even of the Duplex. Since the corners as I show you in the photos are not "folded" or rather "dubbed", since they are not crushed, leaving the corner as shown in the image.

4ed1ca8b.jpg f2829aca.jpg


The machine has been disassembled from the Output Unit (starting from the Fusor), to the lower tray of the Finisher. Checking passage areas, guides or surfaces susceptible to burrs or impurities that can cause the paper to stumble.


Changes made:
- Heat roller
- Pressure Roller
- Web Blanket
- The relevant Bearings of the Fusion Unit
- Cleaning of the input and output guides of the Fusion Unit.


At first we attributed it to moisture in the paper, since with tests made with another that we have in the workshop, we have not reproduced the defect. Fun fact, is that this role in other devices that the client has (MP 7500 + MP C2003 + MP C3300) does not happen the same.


Any suggestions?

[slimslob]

Re: Curve the corners - MP 5002

The machine has been disassembled from the Output Unit (starting from the Fusor), to the lower tray of the Finisher. Checking passage areas, guides or surfaces susceptible to burrs or impurities that can cause the paper to stumble.

As part of those passage areas, guides or surfaces did you include the fusing unit strippers? More specifically the that would be closest to the corner of the paper as it leaves the hot roller. A little toner buildup under the stripper will cause that problem.They should be replaced every other fusing unit PM.

[UNICORNico]

Re: Curve the corners - MP 5002

As part of those passage areas, guides or surfaces did you include the fusing unit strippers? More specifically the that would be closest to the corner of the paper as it leaves the hot roller. A little toner buildup under the stripper will cause that problem.They should be replaced every other fusing unit PM.

I'll get another Fusion Unit to try, but I'll keep in mind what you just told me. Although the strippers are in perfect condition.
When I can I report on the situation.

[sandmanmac]

Re: Curve the corners - MP 5002

A lot of replaced parts without first making an effort to identify the area that the fold occurs.
There's No mention of you stopping the machine during the print / copy process at various times to isolate the time that the fold occurs.
This looks to me like a damaged or dislodged vertical guide (those black flaps that get broken all the time).
You mentioned the finisher.....Does this occur if take the finisher and bridge unit out of the equation, and send the output to the inner copy tray?

[emiliorsg]

Re: Curve the corners - MP 5002

Does the same thing happen to you on one side as on two sides? Something similar to double-sided has happened to me in other machines because of the duplex entry guide.

[slimslob]

Re: Curve the corners - MP 5002

Does the same thing happen to you on one side as on two sides? Something similar to double-sided has happened to me in other machines because of the duplex entry guide.

A lot of replaced parts without first making an effort to identify the area that the fold occurs.
There's No mention of you stopping the machine during the print / copy process at various times to isolate the time that the fold occurs.
This looks to me like a damaged or dislodged vertical guide (those black flaps that get broken all the time).
You mentioned the finisher.....Does this occur if take the finisher and bridge unit out of the equation, and send the output to the inner copy tray?

From looking at his images, the folds have not been pressed flat like they would be if the corners got bent over before entering the fusing unit.

[mikadonovan]

Re: Curve the corners - MP 5002

Does this occur if take the finisher and bridge unit out of the equation, and send the output to the inner copy tray?

Excellent question. It does look like post fusing dog ears.

[orestesp]

Re: Curve the corners - MP 5002

You might want to take a look at this thread:

MP 4001 Dog-earing only on duplex

So it looks like I had two issues causing the dog-ear.

1. The metal frame that is in front of the development unit was bent inward by a couple of millimeters. This was causing the rear side of the paper to hit the plastic frame of the PCU, thus causing my "pressed" dog-earing and wrinkling.

2. The second issue was the missing brackets mentioned by Smee. (Thanks Smee!) This was causing my "curled" dog-ears in the finishing unit.

Cause #1 was giving me the trouble seen in the pictures you attached.

[UNICORNico]

Re: Curve the corners - MP 5002

A lot of replaced parts without first making an effort to identify the area that the fold occurs.
There's No mention of you stopping the machine during the print / copy process at various times to isolate the time that the fold occurs.
This looks to me like a damaged or dislodged vertical guide (those black flaps that get broken all the time).
You mentioned the finisher.....Does this occur if take the finisher and bridge unit out of the equation, and send the output to the inner copy tray?

Does the same thing happen to you on one side as on two sides? Something similar to double-sided has happened to me in other machines because of the duplex entry guide.

Yes in the 2 corners. When this happens the traffic jams are confirmed.

dfe71b6b_2.jpg

Originally Posted by sandmanmac
Does this occur if take the finisher and bridge unit out of the equation, and send the output to the inner copy tray?

Excellent question. It does look like post fusing dog ears.

After testing yesterday, for 2 hours, the fold is caused between the Bridge Unit and the Exit Unit, only in works on 2 sides (duplex), at no time on one side.
That's right, as I show in the photo to the answer of comrade emiliorsg

You might want to take a look at this thread:

MP 4001 Dog-earing only on duplex
Originally Posted by Ricoh-ono
So it looks like I had two issues causing the dog-ear.
1. The metal frame that is in front of the development unit was bent inward by a couple of millimeters. This was causing the rear side of the paper to hit the plastic frame of the PCU, thus causing my "pressed" dog-earing and wrinkling.
2. The second issue was the missing brackets mentioned by Smee. (Thanks Smee!) This was causing my "curled" dog-ears in the finishing unit.

Cause #1 was giving me the trouble seen in the pictures you attached.

Discard any area, prior to the fuser, because it is not crushed. Still, it's good to know that.

[Zaxxon]

Re: Curve the corners - MP 5002

This could be moist paper, did you try a fresh packet from your office in the machine?

Also check paper path for stickiness.

[Gift]

Re: Curve the corners - MP 5002

This could be moist paper, did you try a fresh packet from your office in the machine?

Also check paper path for stickiness.

Yeah it's always a good decision to bring a realm of paper to test it against the customers quality.

This MFP is pretty old, even if the surfaces / gates above the fuser and upper parts of the right door "feels" OK, I bet these parts are all most likely more or less warped.

[UNICORNico]

Re: Curve the corners - MP 5002

Yeah it's always a good decision to bring a realm of paper to test it against the customers quality.
This MFP is pretty old, even if the surfaces / gates above the fuser and upper parts of the right door "feels" OK, I bet these parts are all most likely more or less warped.

That test has already been performed. I think I'll leave it explained at the end of the first post.
But the strange thing is that if the humidity, why only with this device?, the client has 3 more devices and in none it reproduces.
If it is I should check the Exit Unit more thoroughly, although I am also leaving time to discard the theory that by lowering the temperature of the Fuser Unit, it began to perform the defect less frequently.
Let's see what the client tells me in a few days...

[GIUBOSS]

Re: Curve the corners - MP 5002

That test has already been performed. I think I'll leave it explained at the end of the first post.
But the strange thing is that if the humidity, why only with this device?, the client has 3 more devices and in none it reproduces.
If it is I should check the Exit Unit more thoroughly, although I am also leaving time to discard the theory that by lowering the temperature of the Fuser Unit, it began to perform the defect less frequently.
Let's see what the client tells me in a few days...

Keep in mind that these models you mentioned (MP 7500 + MP C2003 + MP C3300) do not have the exact same paper path, fusers etc. One test I would make the paper exit from the internal tray.

[emiliorsg]

Re: Curve the corners - MP 5002

On the MP 7500 C3300 they have fewer problems with paper humidity. On the other hand, the c2003 copies usually come out rolled up.

[UNICORNico]

Re: Curve the corners - MP 5002

Keep in mind that these models you mentioned (MP 7500 + MP C2003 + MP C3300) do not have the exact same paper path, fusers etc. One test I would do is get the paper out of the internal tray.

Yes, it is proved, papel in the internat tray, no problem.

On the MP 7500 C3300 they have fewer problems with paper humidity. On the other hand, the c2003 copies usually come out rolled up.

Ahm... Yes, I know.