Sharp MX-2300N printing quality problem

[Jack79]

Hello

I am not a technician and I am sorry about my english. I would like to ask experienced friendly technicians how to resolve my problem. I bought used Sharp 2300n which was probably not in use and was sitting in a warehouse. It starts great, I tried print some pages and some letters were light. I saw also toner on the paper which I can removed by finger.

I made a picture

Sharp2300printqualityproblem.jpg
and I mark place where print is not good. The same page printed again give better and then worse quality.

I changed black toner cartridge but it didn't solve this problem.
I have Service Manual and I can provide more information form sym if required but please explain me what and how should I check it.

I remove developer units and they are clean so I would like to ask for a help.

[igi]

Re: Sharp MX-2300N printing quality problem

hi
if other colours give you similar problem, then most likely belt

if not then black drum unit

[faxman28]

Re: Sharp MX-2300N printing quality problem

if copier is not making a thumping noise as it runs(coming from right side) the fuser pressure levers are probably up, so fuser rollers don't flat spot when copier was stored. That's what your copy sample looks like.

Run about 100 copies or more and see if quality gets better(after checking fuser ) . If quality doesn't improve you may have to replace drums and developers due to age. Your example doesn't show very many pages have been printed. also the machine has not been calibrated. I would have a Sharp tech check out the copier and at least do the calibrations.

[Jack79]

Re: Sharp MX-2300N printing quality problem

Thank you for your advise.
I attached new picture.
IMG_4620.jpg

As you can see colour letters look ok. Only on top of the page black letters are horrible. I have replace black letter with blue and instead of yellow I put black and there is a problem. 1 picture has some black toner left on the paper. I will try replace black drum unit and then I will back to forum.
Why bad prints are on top and sometimes on bottom of the page? In the middle of the page everythin look ok.

Is it possible that anything else can solve my problem?

[Jack79]

Re: Sharp MX-2300N printing quality problem

if copier is not making a thumping noise as it runs(coming from right side) the fuser pressure levers are probably up, so fuser rollers don't flat spot when copier was stored. That's what your copy sample looks like.

Thank you for that but I am not sure what does flat spot mean. Machine is not making noise. How can I check levers (I am not sure what levers are you talking about). If you are right how can I solve this problem please?

[faxman28]

Re: Sharp MX-2300N printing quality problem

Thank you for your advise.
I attached new picture.
[ATTACH=CONFIG]25849[/ATTACH]

As you can see colour letters look ok. Only on top of the page black letters are horrible. I have replace black letter with blue and instead of yellow I put black and there is a problem. 1 picture has some black toner left on the paper. I will try replace black drum unit and then I will back to forum.
Why bad prints are on top and sometimes on bottom of the page? In the middle of the page everythin look ok.

Is it possible that anything else can solve my problem?

no seeing color samples, check the black drum unit, and check your fuser rollers, some of the black spots looks like toner not fusing properly, Is it Sharp toner in copier or generic(both toners old and new one you put in.) Or there is black toner built up in machine somewhere dropping on to paper ?

[faxman28]

Re: Sharp MX-2300N printing quality problem

Thank you for that but I am not sure what does flat spot mean. Machine is not making noise. How can I check levers (I am not sure what levers are you talking about). If you are right how can I solve this problem please?

The fuser rollers (unit is in right side of copier) are made from a rubber type material and are pressed together, when machine sits with fuser rollers pressed together they get flat spot, and when copier runs you hear thumping sound come from right side. If you look at section N fusing unit of service manual it shows fusing unit and pressure levers.

[Jhonjon]

Re: Sharp MX-2300N printing quality problem

Thank you for that but I am not sure what does flat spot mean. Machine is not making noise. How can I check levers (I am not sure what levers are you talking about). If you are right how can I solve this problem please?

It is better to call a qualified technician to isolate the problem of the machine. If we will recommend to you to replace things specially consumables (DR,DV and blade) it will be difficult for you, second you need also to perform some programs.

[Jack79]

Re: Sharp MX-2300N printing quality problem

no seeing color samples, check the black drum unit, and check your fuser rollers, some of the black spots looks like toner not fusing properly, Is it Sharp toner in copier or generic(both toners old and new one you put in.) Or there is black toner built up in machine somewhere dropping on to paper ?

I printed colour picture (CMY sample) and this picture is ok (clear without light print) but some black toner dots left on the paper. I remove them by finger.
Both toners do not have Sharp label so I think they are compatible.
if I replace (for a test) drum unit do I have to calibrate machine?

[Akitu]

Re: Sharp MX-2300N printing quality problem

That machine should probably be calibrated anyways. User colour calibration can be performed under the copy and printer settings, respectively titled "Auto Colour Calibration".

With the right door open if you look at the fuser, on the left and right sides above the grey levers you'll see two black/blue arms sticking out just over top, there may or may not be an envelope sticker around that area. If those pressure tabs are left up, as others have said, it will cause conditions that do not permit toner to fuse properly.

[Jack79]

Re: Sharp MX-2300N printing quality problem

That machine should probably be calibrated anyways. User colour calibration can be performed under the copy and printer settings, respectively titled "Auto Colour Calibration".

With the right door open if you look at the fuser, on the left and right sides above the grey levers you'll see two black/blue arms sticking out just over top, there may or may not be an envelope sticker around that area. If those pressure tabs are left up, as others have said, it will cause conditions that do not permit toner to fuse properly.

You are genius. Those pressure tabs were left up.
Problem solved.
Thanks for that.

[Akitu]

Re: Sharp MX-2300N printing quality problem

You are genius. Those pressure tabs were left up.
Problem solved.
Thanks for that.

I wasn't the first to say it, just the first to describe it; credit should be going elsewhere.