Mpc2051 - half page have bad toner transfer

[luca72]

Hello everyone, today I visited a customer with mpc2051, I state that he had not explained the defect well, and I had only common spare parts with me.
practically prints half sheet with bad transfer from belt to paper (not random).
I disassembled and checked the complete itb, I replaced the PTR roller, I stopped the mc during printing, at the point of the defect, and the image on the transfer belt is there, so it's half an image does not transfer to the paper
I also tried to change the socket, you never know, some electrical noise, but nothing


I'll be back tomorrow with:
-ITB complete unit (used)
-complete PTR unit with stand, and all (used)
- PTR approach mechanism / motor. (used)
-power pack TTS (pcb16)


if you want to suggest me something else, welcome

has it already happened to someone?

01T.jpg

[slimslob]

Re: Mpc2051 - half page have bad toner transfer

Hello everyone, today I visited a customer with mpc2051, I state that he had not explained the defect well, and I had only common spare parts with me.
practically prints half sheet with bad transfer from belt to paper (not random).
I disassembled and checked the complete itb, I replaced the PTR roller, I stopped the mc during printing, at the point of the defect, and the image on the transfer belt is there, so it's half an image does not transfer to the paper
I also tried to change the socket, you never know, some electrical noise, but nothing


I'll be back tomorrow with:
-ITB complete unit (used)
-complete PTR unit with stand, and all (used)
- PTR approach mechanism / motor. (used)
-power pack TTS (pcb16)


if you want to suggest me something else, welcome

has it already happened to someone?

[ATTACH=CONFIG]53393[/ATTACH]

It has been years since I have worked on a C2051, but they had a tendency of breaking PTR latches allowing pressure on one side to be reduced.

[8T2]

Re: Mpc2051 - half page have bad toner transfer

Cursed by working on a site that still has a boatload of these and 99% certain you have a busted transfer lock lever

D0396229 LEVER:SET:FRONT
D0396230 LEVER:SET:REAR

Usually it's just the little tabs on the levers that snap off and I got tired of replacing them and started repairing them by making my own tabs, if the ring didn't split, with a product available over here called Q-Bond, basically good quality superglue/crazy glue that comes with its own powders but glue and bicarbonate of soda or salt does a good enough job too.

Make sure both springs are still present too because they somehow disappear whenever the levers break.

Sent from my SM-A305F using Tapatalk

[luca72]

Re: Mpc2051 - half page have bad toner transfer

Cursed by working on a site that still has a boatload of these and 99% certain you have a busted transfer lock lever

D0396229 LEVER:SET:FRONT
D0396230 LEVER:SET:REAR

Usually it's just the little tabs on the levers that snap off and I got tired of replacing them and started repairing them by making my own tabs, if the ring didn't split, with a product available over here called Q-Bond, basically good quality superglue/crazy glue that comes with its own powders but glue and bicarbonate of soda or salt does a good enough job too.

Make sure both springs are still present too because they somehow disappear whenever the levers break.

Sent from my SM-A305F using Tapatalk

Hello, I understood what you are talking about, at the beginning I changed them too, then since even from new they have the tendency to freeze giving boredom to both me and the customer, I started to remove the whole mechanism, spring, hooks, levers, everything in short, everything is close with the duplex, (mp4000 style) and on dozens of machines, I have never had any problems, this problem, least of all.

[dalewb74]

Re: Mpc2051 - half page have bad toner transfer

clean ITB sensors?

[luca72]

Re: Mpc2051 - half page have bad toner transfer

clean ITB sensors?

Yes, clean First of reinstall the itb

[8T2]

Re: Mpc2051 - half page have bad toner transfer

Hello, I understood what you are talking about, at the beginning I changed them too, then since even from new they have the tendency to freeze giving boredom to both me and the customer, I started to remove the whole mechanism, spring, hooks, levers, everything in short, everything is close with the duplex, (mp4000 style) and on dozens of machines, I have never had any problems, this problem, least of all.

I honestly never tried it with both levers removed. I was afraid it will cause equally light prints on both sides but now that you mention it it makes sense that it won't raise the 1 side if there is no lever/spring applying pressure on the other side. Will give it a try next time thanx

Sent from my SM-A305F using Tapatalk

[8T2]

Re: Mpc2051 - half page have bad toner transfer

I honestly never tried it with both levers removed. I was afraid it will cause equally light prints on both sides but now that you mention it it makes sense that it won't raise the 1 side if there is no lever/spring applying pressure on the other side. Will give it a try next time thanx

Sent from my SM-A305F using Tapatalk

Off topic but the duplex open/close gate that always breaks on these can also be removed completely in lots of cases and the machine works fine. Still trying to pinpoint the cause on the machines that don't want to work without it installed but these days I just remove it and will only replace if it causes problems

Sent from my SM-A305F using Tapatalk

[luca72]

Re: Mpc2051 - half page have bad toner transfer

hi, this morning I went back to the customer, and I replaced in sequence, one at time a follow part
- complete PTR unit (used) = NG
- transfer & PTR HVT board = NG
- complete ITB unit = quasi ok

in the end it was almost okay, but on the one hand there was still a bad transfer.
so, I broke my balls, and we decided to replace the machine with another 2051 that I am overhauling now.
unfortunately time is money, so we preferred to avoid other exits.

thanks for your cooperation, see you next time

[UNICORNico]

Re: Mpc2051 - half page have bad toner transfer

I had a similar case just over 1 year ago, with an MPC2030. The defect was very similar, but in my case it was all over the page and I did it in a staggered way (like a pedestrian crossing).
It turned out that the transfer band was replaced and installed incorrectly, in the orientation that it was not. I was required to disassemble the entire ITB, put the transfer belt in the correct orientation, take advantage and clean all the rollers to ensure both traction and avoid impurities, which will affect the quality.
The problem was fixed.

[GIUBOSS]

Re: Mpc2051 - half page have bad toner transfer

check if the paper is damp

[luca72]

Re: Mpc2051 - half page have bad toner transfer

check if the paper is damp

no, it is a very dry environment, then the machine has been there for 4 years, now that we replace it with another mpc2051 revisionated, I bring that here to the laboratory, and I will find out what the problem is, (I have here 4 mpc2051 semi-complete for try parts)

[luca72]

Re: Mpc2051 - half page have bad toner transfer

Cursed by working on a site that still has a boatload of these and 99% certain you have a busted transfer lock lever

D0396229 LEVER:SET:FRONT
D0396230 LEVER:SET:REAR

Usually it's just the little tabs on the levers that snap off and I got tired of replacing them and started repairing them by making my own tabs, if the ring didn't split, with a product available over here called Q-Bond, basically good quality superglue/crazy glue that comes with its own powders but glue and bicarbonate of soda or salt does a good enough job too.

Make sure both springs are still present too because they somehow disappear whenever the levers break.

Sent from my SM-A305F using Tapatalk

And you were right man, after several tests here in the laboratory, it turned out that the machine had a double problem, the first was the ITB with some elettric dispersion, I'll investigate, the second problem was just those two plastic hooks, the thing is really strange, because as I said I usually remove all the mechanism, and I never had any problems, even the one we had here last year in administration, without hooks and mechanism, I myself have printed some photos of excellent quality
anyway thank you all for your cooperation