[Jamming] MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling roller?

[emo]

I've seen this before, don't know how to fix it.

These 2 machines at one site do a very large mono run one day per week (approx 10,000 B/W copies without a rest)

The problem arrises when the cooling/decurl roller on the exit side of the fusing unit gets so hot towards the rear of the machine that toner must be coming off the paper and sticking to it. As the toner is soft and tacky due to the heat on the roller it causes dog earing and paper jams.

Rest the machine for a while, roller cools down. Begin copying again and it works fine for a couple of thousand pages, until the toner becomes tacky (rinse and repeat).

Obviously cleaning the roller helps for a little while but the toner returns during the next big print run.

My thinking is that the roller has a heat sink and fan at the front, but not at the back, hence why it only happens at the rear.

Has anyone seen this and found a solution? In my opinion it is a design fault, but most places never encounter this issue because they don't do huge runs on them?

HELP!

[Polo-022]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

Well, i have seen that a couple of times in the same machine but it is an MP-C 7500. Unfortunately, i did not find a solution till now!

[Captain Scott]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

Has this only recently started to occur? For example were they doing this run when machine was new and had no issues? Is it when copying or is it a print job?

[Max]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

Long shot but try reducing the temp by 5-7 degrees C and adjusting vt ref so there is less toner in the dev tank. You might want to chek ricoh website for bulletine on toner amount/controll and how to set it up.Adjust fuser stripper fingers with the gauge provided (very important) see service manual. Or perhabs convice cust to change for 2 mpc 5000 1/3 of the price.

[butcher]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

I agree with Max- MPC6501/7501 is a dog of a machine!!

[turbojetboy]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

I agree with Max- MPC6501/7501 is a dog of a machine!!

Hey butcher, between these ones and the Pro c machines...............you need a holiday!

[butcher]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

Hey Turbojetboy,

Yes I am looking forward to a holiday and hope you are enjoying yours.Hopefully you got onto some snapper!!

[iambeetle84]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

we have a mpc 7500 that is getting the same jam, but it is getting caught in the front of the fuser. we have changed all the parts in the exit of the fuser. even put in a new fuser($1775). still the same jamming within a few days. customer will run sets (of quilt patterns) of about 1200 at a time. not allot but shes calling twice a week and she not that pleasant. so now they have been sending us out every 2weeks to change the cleaning rollers...fun

[banginbishop]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

we have a mpc 7500 that is getting the same jam, but it is getting caught in the front of the fuser. we have changed all the parts in the exit of the fuser. even put in a new fuser($1775). still the same jamming within a few days. customer will run sets (of quilt patterns) of about 1200 at a time. not allot but shes calling twice a week and she not that pleasant. so now they have been sending us out every 2weeks to change the cleaning rollers...fun

been told by my old service manager these machines must have the filters cleaned on regular basis or they cause no end of problems. Might not sort yours out but no harm in cleaning the filters out - oh dont ask me where as ive looked and can only find a few.

[Gary Bowen]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

You do realize that the Stripper Pawls are adjustable on the MP C6501? There is a GO/NO GO Shim provided on the Fuser Unit. The Fuser Unit has to be out of the machine and separated to do this adjustment. I had one that started to dogear 11 X 17 paper (letter and legal seemed fine) after a couiple of months at a customer site. Once I completed the adjustment for the Stripper Pawls no more jams!

[teebee1234]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

been told by my old service manager these machines must have the filters cleaned on regular basis or they cause no end of problems. Might not sort yours out but no harm in cleaning the filters out - oh dont ask me where as ive looked and can only find a few.

This is actually a big deal and should be an automatic check on service calls. Look in the back under the controller interface and you will see a cover with a slotted plastic plug. Turn that and pop it out and remove the cover. If it hasn't been checked in a while then you will see toner pouring out of it before you remove the 4 filters (3 cloth and 1 ozone). Hold your vacuum nozzle under the opening as you remove them. Remember how they are facing as the tabs are keyed to slots in the cover. Blocked filters will cause the air flow to decrease or stop passing over the cooling fins on the decurler, which will lead to your problem and general dusting inside. Check the other filters on the exit side of the machine in the rear also. Also make sure the fans are functioning at normal speed as toner builds up and bonds on the blades, causing them to stall or stop. There are either 2 or 4 fans on the exit side of the machine (pull away the finisher) and check those. You will have an error code if they stop running but if they are running slow then replace them.

[blanka]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

Teebee, dont know how long you have been doing this but you are good!! Are you technical support cause i have seen some of your replies and you are always on the money and you have also helped me in the past as well. Good on you. Thanks.

[emo]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

I solved this issue of toner sticking to the decurl roller by having the roller coated with Teflon at a professional coater factory. This worked 100% and the roller never gets toner on it anymore.
Cost was around $50.

It is worth noting that the two machines with this issue were brand new and all the fans and filters etc were 100% clean and functional.

Thanks for the replies

[tcs04]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

I solved this issue of toner sticking to the decurl roller by having the roller coated with Teflon at a professional coater factory. This worked 100% and the roller never gets toner on it anymore.
Cost was around $50.

It is worth noting that the two machines with this issue were brand new and all the fans and filters etc were 100% clean and functional.

Thanks for the replies

!!! Send that one to Ricoh!!

There is a bulletin out for the corner folding problem advising you to check / adjust the fuser nip as this increases over time, causing curl. There was a similar problem on the MP1100 / pro series machines.

Of course, the stripper adjustment is the first step.

[Bantams]

Re: MPC6501/7501 Jamming and dog ears, fuser exit, toner building up on cooling rolle

I've found removing the end brown claws from the pick off assembly stops the folding of the corners