Vertical Banding on Brand new Mimaki UJV55-320

[Aris]

We just bought a brand new Mimaki UJV55-320 and we have severe and strange vertical banding in 2 passes and 4 passes .
Very disappointed with Mimaki since it’s been 4 days the machine is installed and still no solution!!!!

 

[Gino]

Do you have any pictures of it, close up and a little distance ??

 

[Aris]

Do you have any pictures of it, close up and a little distance ??

please see pics. Thanks

 

[ToTo]

Which RIP u are using?
Try first with Rasterlink.
Who sold the machine and RIP? They are responsible for any warranty.

 

[Aris]

Rasterlink. Mimaki official distributor sold us the machine! But they do not know what’s wrong!

 

[André Silva]

This is with all materials that you are printing or jus some of them?

 

[Aris]

Unfortunately with all material. Actually before we purchased the printer we tested the same materials on exactly the same printer in Greece and there were no issues/problems

 

[ToTo]

If it’s on all media I would try to get help from Mimaki through the sales company. If they can’t solve it machine needs to be replaced immediately.
Have bou the machine with „soft media kit“?

 

[André Silva]

Try to print whith unidirectional mode to check if is making. but i think the problem will be in the lamps that are not working ok.

 

[Aris]

We are already in touch with the representative in Cyprus. They keep receiving instructions from Mimaki Europe to do some tests. All the tests performed so far have not led to any conclusion.....
I do not beleive they know whats wrong so we will demand for a replacement, but I am sure they will try to avoid this...
I do not think that the soft media kit will make any difference, After all the printer we tested the materials in Greece, with no problem, did not have one

 

[Aris]

Tried that same problem.

 

[André Silva]

So could be the lamps. The machine can print without lamps?

 

[Aris]

Did not check without lamps .

 

[Gino]

I'm not an expert on Mimaki, but if a machine uses UV lamps for curing, I would venture to say they'll never cure for about 8 months if they're turned off and you put the signs out in the sun for a long time.

To me, it looks as if your signal is constantly being interrupted while sending. Not randomly, but constantly. I'd check cables and inputs, ethernet and signals for possible losses. Something must be interfering with your signal. Is your electric clean ??

 

[André Silva]

Yes the ink will never cure or dry without the lamps. But the question here is not to use the machine without lamps is just to check if is the lamps or not that are causing the vertical banding. When the lamps are not working fine it cause a bad cure of the ink and it possible to see anomalies in the color and printing. Normally vertical banding is cause for problems in the X-assis of the machine (encoder, encoder sensor, engine etc..) but once this machine also the lamps that is going in x-assis its easy to start to check this

 

[Gino]

Good luck with that scenario. It'll only work in your own head.

 

[Aris]

Thank you for your positive thoughts

 

[Hamster]

I've seen this problem on many printers.
problem may be in input electrical power supply, the voltage drops when loaded.
In this happening needed check input electrical circuit.

Another cause in motor speed. Need programming servo driver for electricity in acceleration, work mode and bracking

 

[Aris]

I've seen this problem on many printers.
problem may be in input electrical power supply, the voltage drops when loaded.
In this happening needed check input electrical circuit.

Another cause in motor speed. Need programming servo driver for electricity in acceleration, work mode and bracking

Problem with input electrical power is not possible since the machine is connected to UPS.

 

[Warpspace]

I once spoke someone who had vertical banding and it took them 4 months to solve the problem. The problem turned out to be some kind of imbalance in the lamp fans causing the carriage to vibrate during print. Replacing the fans solved that one.

Perhaps try without the lamps fans on JUST FOR A VERY SHORT TIME, and see if it helps. If the problem goes away, replace the fans.