[Misc] Problem MPC4503 in papel SRA3 to 250gms

[UNICORNico]

Dear Technical Colleagues:


The defect is generated (although in my opinion it is how it is best detected) from works done in 250g "A3 Plus" (SRA3) format. At the end of the writing I will provide images of the defect, in some it is marked. Unfortunately since the "Ricoh Technical Assistance in Spain" do not know how to give us any viable solution to this defect.


Different printing tests have been carried out, starting from the options that the specific drivers (PCL 6 for updated MP C4503 model, from the RICOH website), such as "Thick Paper 3" and "Thick Paper 4", selecting maximum pixel quality "4800 x 1200 DPI", to favor favor favor a slower pace through the device. The defect is only appreciated as a decrease in single print if the device has an "x" period of inactivity in use, but null in multiple printing (more than 1 print) the defect became more visible, and this rule was not always met.


Despite the tests carried out, it was detected that the defect was not only in blue tones but in the rest of the colors.


The defect has symmetry in all tests performed, despite variations in the composition of the image or file used for them, either in "bypass" or in the relevant drawer with the pre-configured configuration, for said type of paper.
All detailed configurations are required by specific work requirements that the customer requires, since with "conventional" weight paper (80g) with different sizes (A4, A3 and A3+) this defect is not presented. Except when performing the "Printer Mode" test pattern from "SP Mode".

SUBSTITUTED PARTS:
-CIAN Drum Unit
-CIAN Reveal Unit
-Black Reveal Unit
-Fusion Unit (Fuser Fixin Film)
-Transfer Unit (Full)
-Laser unit (including polygonal motor)

EXTERNAL SETTINGS:
-Surge in the springs of the fusion system
-Lowering the tension of the springs of the fusion system
-Color calibration parameters settings

https://drive.google . com/drive/folders/1oVhQZJvS76nMKIx_S3Bb1_cU6p2Blh5y?usp=sharing


We appreciate any help or possibility to rule out this problem since by different inquiries, it seems to be a degenerative problem in this model, and as the age is increasing.
A cordial greeting.

[8T2]

Re: Problem MPC4503 in papel SRA3 to 250gms

I would try a new Magenta PCU and development unit. Problem is that chances are the Yellow will need replacing soon also.

How many prints on the machine? And what are the PM counters on for the PCU's and Development units?

Sent from my WAS-LX1 using Tapatalk

[UNICORNico]

Re: Problem MPC4503 in papel SRA3 to 250gms

I would try a new Magenta PCU and development unit. Problem is that chances are the Yellow will need replacing soon also.

How many prints on the machine? And what are the PM counters on for the PCU's and Development units?

Sent from my WAS-LX1 using Tapatalk

I appreciate the answer, buddy.


But the Black Developer Unit and Developer Cyan, have already been changed as indicated at the beginning of the post, and this did not solve the problem as you can see.


I'm afraid that even if you changed all the full image units (Drum Unit + Developer Unit) this defect would not be fixed. In the images I left of sample are based on these tests with the Cyan Color, and the defect remains.
From our Ricoh Technical Support department in Spain to distributors, they still do not provide us with solutions and refer us to parts that have already been changed, such as the Transfer Unit.

[TonerMunkeh]

Re: Problem MPC4503 in papel SRA3 to 250gms

I've run into this before. It's shock jitter between the PTR and the fusing unit. Unfortunately, there is nothing that can be done about it, it is a known limitation of this model.

[GIUBOSS]

Re: Problem MPC4503 in papel SRA3 to 250gms

increase the temperature gradually by +5 and try, then again. The roller tension springs return to the original or higher position. Another thing, are the toners original? the paper is well preserved and must be smooth to the touch. Film fusers do not fix very well with porous thick paper.

[UNICORNico]

Re: Problem MPC4503 in papel SRA3 to 250gms

I've run into this before. It's shock jitter between the PTR and the fusing unit. Unfortunately, there is nothing that can be done about it, it is a known limitation of this model.

It's what we were afraid of, that it was a degenerative defect. I'd still appreciate it if you'd explain to me a little more about what you've said and forgive my English, I support myself a little in the translator, but what is jitter?

increase the temperature gradually by +5 and try, then again. The roller tension springs return to the original or higher position. Another thing, are the toners original? the paper is well preserved and must be smooth to the touch. Film fusers do not fix very well with porous thick paper.

Apart from the "fuser fixing film" the entire Fusing Unit has been replaced, in order to discard motifs in this defect.
On the toner, it is original, but I do not design defective remittance, to happen other times, consult with our Ricoh Technical Support.
The temperatures issue has already been tested, there are no relevant changes.
Still, thank you.

[Herrmann]

Re: Problem MPC4503 in papel SRA3 to 250gms

I could not see an example, so this here is a complete shot in the dark, but maybe it will help you. Your description sounds for me, that the problem happens, when the heavy stock leaves the registration roller, which held it straight until it leaves the rollers. The reason for this is, that the fuser is only driven from one side (the backside, if i remember correctly) and the additional mechanical power the fuser needs to drive the heavy stock leads to more friction between the gears which forces the fusing unit a bit upwards on the driven side taking the sheet with it.

This helps me years ago on a earlier model:

CALLING ALL McGYVER'S

Ps.: You should not run great amounts of heavy stock on this model

[blackcat4866]

Re: Problem MPC4503 in papel SRA3 to 250gms

I don't know this model, but I'll offer a theory. Your defect appears to be in the cross-feed direction, always the same distance from lead or trail edge. I suspect the heavy stock shakes as the leading edge enters the bite of the fusing rollers, blurring the latent image at the leading edge. In the same way the heavy stock can get shaken as it leaves the registration rollers, blurring the latent image at the trail edge.

I saw this often on Okidata printers. The customer was running 300gsm glossy stock (the maximum weight for that printer). When he asked me how heavy a stock he could run, I said this is how to tell. If it blurs it's too heavy.

This customer continued to ignore my advise. They were printing business cards and just tossed out the ones that had the blurs.
=^..^=

[UNICORNico]

Re: Problem MPC4503 in papel SRA3 to 250gms

I could not see an example, so this here is a complete shot in the dark, but maybe it will help you. Your description sounds for me, that the problem happens, when the heavy stock leaves the registration roller, which held it straight until it leaves the rollers. The reason for this is, that the fuser is only driven from one side (the backside, if i remember correctly) and the additional mechanical power the fuser needs to drive the heavy stock leads to more friction between the gears which forces the fusing unit a bit upwards on the driven side taking the sheet with it.

This helps me years ago on a earlier model:

CALLING ALL McGYVER'S

Ps.: You should not run great amounts of heavy stock on this model

Dude Hermann, and seen the post, you and other are high-level engineers, there are things that I wouldn't dare or crazy, my knowledge of electronics is not so advanced.
Some of the "Made In McGyver repairs" are praised and something has ever been done to me.


On the subject of the example smy defect are in this link of "Google Drive" but has some spaces to prevent the web from blocking the link.
CASO COPISTERIA - Google Drive

[slimslob]

Re: Problem MPC4503 in papel SRA3 to 250gms

Dude Hermann, and seen the post, you and other are high-level engineers, there are things that I wouldn't dare or crazy, my knowledge of electronics is not so advanced.
Some of the "Made In McGyver repairs" are praised and something has ever been done to me.


On the subject of the example smy defect are in this link of "Google Drive" but has some spaces to prevent the web from blocking the link.
https://drive.google. com/drive/folders/1oVhQZJvS76nMKIx_S3Bb1_cU6p2Blh5y?usp-sharing

You still have a space where it should not be. Between the 'DOT' and the 'com'

[UNICORNico]

Re: Problem MPC4503 in papel SRA3 to 250gms

OK, it's already fixed in all posts, it didn't want to create problems with the topic of "external links" to the forum, in case these could be blocked.

[Herrmann]

Re: Problem MPC4503 in papel SRA3 to 250gms

What i forgot to mention: This Model had a lot of Firmware issues, sure, that your Firmware is the latest and greatest?
Try a lower Resolution, does the error disappear?

OK, it's already fixed in all posts, it didn't want to create problems with the topic of "external links" to the forum, in case these could be blocked.

Its fine for me, now i can see the error. This has not to do with the Fuser, IMHO its a Problem in the Transfer region, caused due to Vibrations. There was a Technical Report for this, try
SP1-801-133/134/135 , change values from -20 to -280, after that sp2-111-004 engage

[UNICORNico]

Re: Problem MPC4503 in papel SRA3 to 250gms

What i forgot to mention: This Model had a lot of Firmware issues, sure, that your Firmware is the latest and greatest?
Try a lower Resolution, does the error disappear?



Its fine for me, now i can see the error. This has not to do with the Fuser, IMHO its a Problem in the Transfer region, caused due to Vibrations. There was a Technical Report for this, try
SP1-801-133/134/135 , change values from -20 to -280, after that sp2-111-004 engage

I appreciate this information very much, partner.
In the "Technical Bulletins" of Spain there is nothing to reference this defect and that consulting with brothers in arms, in this forum and was able to save more of a problem.
I hope that the Technical Department of Spain will stop marketing to sell and do more to give better attention to its distributors and authorized technicians.
I will test what you have told me, as a data, all the models that we install, we do it with the latest firmware published by RICOH.

[UNICORNico]

Re: Problem MPC4503 in papel SRA3 to 250gms

Victory!!!
Problem solved, although in printing with saturated mass, you can still see some "pandeo". But nothing to do with the main problem.
My sincere thanks to all.

[blackcat4866]

Re: Problem MPC4503 in papel SRA3 to 250gms

May I ask?: How did you fix it? =^..^=