[Misc] Riso RZ220 - black vertical lines on master as well on copies, need your help for fix

[maetsuen]

Good to you all.

My Riso RZ220 has a problem and I have no idea on how to get it fixed.
I usually handle our company's Canon Digital Copiers and a Riso machine is all new to me.

The problem of the Riso machine is that the copies have a black vertical line around 7mm on the entire page from top to bottom.
I have check the master and it appears it have this exact same line as well.


I have attached 2 pictures I have taken.
I hope you could point me in the direction so I can fix this.

Thanks in advance guys!

Please see Copy.jpgmaster.jpg

[maetsuen]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Hello again, I have made 2 more masters and they all still have that black vertical line.
The same as the one I have on the attachment photo.

Thanks again guys!

[Iowatech]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Based on the second picture you shared, it looks like there is ink getting on the pressure roller (the roller directly under the drum). That is because there is some ink on the part of the trail edge of the master on the drum that should be blank. If there is any chance you could show us what is happening on the other side of the drum? That would be helpful.

[maetsuen]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Based on the second picture you shared, it looks like there is ink getting on the pressure roller (the roller directly under the drum). That is because there is some ink on the part of the trail edge of the master on the drum that should be blank. If there is any chance you could show us what is happening on the other side of the drum? That would be helpful.

Thanks for the reply Iowatech.
Here another photo I have, I hope this will do.
It's early morning here & I'll be with this machine after lunch, I'll look for that pressure roller & check it.

Really appreciate the help bro, just pointing me to the right direction means a lot.

12027127_1174966619184714_9135353440444845041_o.jpg

[maetsuen]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Update:

I cleaned the pressure roller directly under the drum which was indeed stained in the exact spot as the master copy's vertical black line.

After cleaning the roller made now a new master copy & made prints. To my disappointment the results were still the same. The pressure roller that I cleaned prior to making a new master is once again stained on that same spot . As expected the prints also had that same black vertical line in 7mm.

I was guessing now it's in the master making process that is problem. I just couldn't figure where to go from here.

I hope for any idea from you guys.

[ennadhe]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

hi, is the original coming from scanning or came from PC?, if it is coming scanning, there is a possibility that your original glass or adf glass is dirty, that maybe a reason why you having this kind of line.

[Iowatech]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Update:

I cleaned the pressure roller directly under the drum which was indeed stained in the exact spot as the master copy's vertical black line.

After cleaning the roller made now a new master copy & made prints. To my disappointment the results were still the same. The pressure roller that I cleaned prior to making a new master is once again stained on that same spot . As expected the prints also had that same black vertical line in 7mm.

I was guessing now it's in the master making process that is problem. I just couldn't figure where to go from here.

I hope for any idea from you guys.

Well, if the problem is in the master making process, look for defects in the master that are outside of the expected print area. The paper absorbs the ink inside the expected print area.
One other thing, as much ink as there is on the master clamp on that drum, you might look at the master disposal area to see if there is something stuck there. The more I think about that, the more it looks like there may be a chunk of master or paper or something there that is rubbing the drum and collecting the ink that is showing up outside the normal print area. There is a chance that could be anywhere in the drum cavity though, so if time permits it wouldn't hurt to look around and see if there is something in there that shouldn't be there.

[NeoMatrix]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

I haven't seen a Riso machine in donkeys years.

I can't know for sure with out looking at the master close up.
I'm leaning towards dirty scanner optics, thermal print head ?

Have you change the roller of master ? Could it be a bad batch of master media ?

The line on the print appears too neat and clean for foreign object rubbing.
Does the problem line on the print move around to different positions ?

[maetsuen]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

I haven't seen a Riso machine in donkeys years.

I can't know for sure with out looking at the master close up.
I'm leaning towards dirty scanner optics, thermal print head ?

Have you change the roller of master ? Could it be a bad batch of master media ?

The line on the print appears too neat and clean for foreign object rubbing.
Does the problem line on the print move around to different positions ?

Hi, I will swap components today from a working machine. I'll see if I can pinpoint the component that's causing this vertical line.
The master used at the moment is now more than half used, when it started to get this vertical black line so suddenly.

Also the vertical black line on the print is permanent on that particular spot, as of now I've done around 6 masters and all vertical lines are on the same spot.

[maetsuen]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Well, if the problem is in the master making process, look for defects in the master that are outside of the expected print area. The paper absorbs the ink inside the expected print area.
One other thing, as much ink as there is on the master clamp on that drum, you might look at the master disposal area to see if there is something stuck there. The more I think about that, the more it looks like there may be a chunk of master or paper or something there that is rubbing the drum and collecting the ink that is showing up outside the normal print area. There is a chance that could be anywhere in the drum cavity though, so if time permits it wouldn't hurt to look around and see if there is something in there that shouldn't be there.

Ok, I'll look into this. I really hope I see something there. Gonna do some component swap today from a working unit. Hopefully I'll pinpoint the faulty component.

[jermyth]

Re: Riso RZ220 - black vertical lines on master as well on copies, need your help for

Have you tried a confidential master? This eliminates thermal print head and scanner for causes. Good luck.