MX-7001N Jamming

[smithson.brown]

Howdy all,


Got three of these at a large account. Each one runs anywhere from 50K to 100K a month (black and white; color is negligible--less then 500 a month.)

Experiencing rampant jamming problems, mainly POD1_N. Thing is, the jamming is very intermittent. We can be on site and run several thousand copies with no issues but later have the customer call back with jamming again. All machines on dedicated outlets with power filters. Only genuine SHARP supplies used--PM intervals never stretched. Everything done by the book. Customer uses decent paper, not the best, but not the worst.

Customer previously had MX-M700's and loved them--they say these MX-7001N's are jam-o-matic's compared to the 700's.

Any secrets as far as servicing these? What could we be missing? Anyone had any luck with turning down the temp in the fusing unit? We are just out of options at this point. It does seem as if the fusing unit is the crux of most of the issues on this series. We've got tons of other first gen color models (2300's, 3501N's, and new models--2600N, 4100N, etc) and never have had any real issues. It's just these 7001N's that seem to be trouble.

Any help would be appreciated!

Smithson

[igi]

Re: MX-7001N Jamming

Under certain environmental conditions (eg. high humidity & high temperature) or heavy use volume, excess toner may build up on the post-fusing upper PG within the fusing unit which may interfere with a sheet passing through the fusing unit, resulting to a POD1 jam.

cheers

[PASTech]

Re: MX-7001N Jamming

We had an MX6201N with Jamming at random. The problem ended up being that the fuser temp along with the Woman dominant environment which only means that women tend to be colder so have their offices sometimes a lot warmer. These two things cause the toner to still be slightly sticky as it hit the grey exit roller just above the fuser. It would stick there and on certain days as the temp outside got warmer and they refused to turn down the heater the exit rollers got caked with toner and then just started to jam every time. First it was random jam intervals. I reduced the fuser temp by 10 degrees for regular paper.

The factors seemed to be a warmer office, lots of large jobs, and because the paper moves so fast that the fuser seemed not to get the slight 'cooling' that the paper normally does as in it draw a bit of heat out of the fuser.

I would look at that exit roller, if it is a new machine there should be no specs of toner on it, if there is little black specs good chance that is just the beginning of worse things to come. Lower the temperature and then go back in 2-3 days just to check the jam counter and get a feel for if it is working. When lowering the temp, just make sure you check that the toner is still fusing especially on the edges of the paper, if on a one sheet run it fuses then you should be good with that temp.

If I am remembering correctly the roller to watch would be part #35 on page 82 (Fusing Section 1) of the MX7001 parts manual.

Hope this helps,

[mojorolla]

Re: MX-7001N Jamming

The fuser on this thing is a monster. It is almost as if Sharp decided to put a lamp and web in any extra space!
They are known for flat spots and ,as igi mentioned, toner buildup on the fuser exit roller. In these cases, I replace the entire fuser. If you walk up to the machine and it sounds like a horse galloping, replace thew fuser. I have also seen the web drag on one end and cause that code.

These machines do not like low volume or environments with high humidity.

The replacement for this unit, 6240-7040 came out a few month ago.

[Akitu]

Re: MX-7001N Jamming

The fuser on this thing is a monster. It is almost as if Sharp decided to put a lamp and web in any extra space!
They are known for flat spots and ,as igi mentioned, toner buildup on the fuser exit roller. In these cases, I replace the entire fuser. If you walk up to the machine and it sounds like a horse galloping, replace thew fuser. I have also seen the web drag on one end and cause that code.

These machines do not like low volume or environments with high humidity.

The replacement for this unit, 6240-7040 came out a few month ago.

All the rave reviews I've heard from our Southern friend makes it seem like it would be a more than adequate replacement for the 6201/7001 machines...

[smithson.brown]

Re: MX-7001N Jamming

We've got several of the MX-6240N's out in the field so far and they are doing great--they really do seem to be much better then the 6201N/7001N.

I appreciate all the help, we will try lowering the temp in the fuser and see if that helps. This is a similar case where users are mainly women and usage is high volume, multi-copy runs. The deal with women being in control is they also tend to be less reasonable then men when it comes to issues! These machines were all installed brand new, all 2011 production models. Just a shame the customer got them right before the Polaris came out.

I'll post back after lowering temp and see if that helps any.

Thanks again!

[Discountcopiers]

Re: MX-7001N registration issues

I am working on a mx7001n with about 350k on it all the mntc is up to date. at about 250k it intermitently started shifting registration toward the lead edge. I did a registration adjustement to the high end of the spec. all was good till now. the color image shifts intermitently with no error codes . I did a 50-22 and no error but the problem is not fixed . I cleaned the sensors and could not find any phisical obstructions ..noises...codes.. .. any ideas? thanx

[Akitu]

Re: MX-7001N Jamming

Check the primary transfer belt main drive gear. Typically they'll crack in the back where the holding pin locks it into place, the gear will either not spin at all if the break is bad enough, or shift the colour toward the lead edge and have perfect black copies if the break is only a half break or a crack.

[Discountcopiers]

Re: MX-7001N Jamming

thanx...You are refering to the gear on the inboard portion of the machine? or on the other side (back) ? or on the primary transfer assembly itself . it seemed to have more play than before. I was going to order the part before i go back.

[Akitu]

Re: MX-7001N Jamming

thanx...You are refering to the gear on the inboard portion of the machine? or on the other side (back) ? or on the primary transfer assembly itself . it seemed to have more play than before. I was going to order the part before i go back.

The gear on the rear side of the primary transfer belt on the right side, the main drive gear that drives the entire belt. Take it off and look at the back of it and inspect for damage.

[Discountcopiers]

Re: MX-7001N Jamming

I know which one you are talking about.I thought i had replaced one that came with the primary trans kit.?? ill be back ther on thurs to check the problem. thanx for your help.

[Akitu]

Re: MX-7001N Jamming

I know which one you are talking about.I thought i had replaced one that came with the primary trans kit.?? ill be back ther on thurs to check the problem. thanx for your help.

A few months ago I had installed a brand new, never rebuilt, straight from Sharp, MX270U1 transfer belt into a 2700. In the span of a week, barely over 4000 copies, the gear had broken and I didn't notice. I had assumed everything from laser to clutch pack, I wound up kicking myself shortly after double checking the belt...

Lesson learned? Even if it's new, that doesn't mean it won't break immediately without reason.

[Discountcopiers]

Re: MX-7001N Jamming

I have kicked myself many times for the same reason... I ordered the gear and some related parts. ill be back there on tuesday.

[Discountcopiers]

Re: MX-7001N Jamming

just to let everyone know... it was the cracked gear that caused the distorted color shifting.it was cracked on the inside pin coupling side. looked great on the outboard side. thanx again for all your help, arnie

[Akitu]

Re: MX-7001N Jamming

Thanks for the update. I had a sneaking suspicion that's what your problem was...