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JV33 Major head strike after media roll end
Just thought I would post this as a warning and perhaps something is not quite right with my JV33:
Printer: Mimaki JV33 130
Media used when problem occured: MD7
Problem:
Printer was left to print 5 meters at 760 wide. at 2.3 meters the media came to the end of the roll. It was attached to the tube, so consequently the media stopped feeding through and printed 1.2 meters in the same place, buckling the media and causing multiple head strikes.Test print directly after problem occurred revealed only the magenta head was firing and only on 35%:
Head wash, 2 x hard cleans 1 x normal and 1 x soft plus manual head clean has (to my relief) completely recovered the head to 100% print. So you can imagine my anxiety while trying to recover the head, with my wifes finger hovering over the "add to cart" button for a new £950 head in case it was completely foooked!
Has my machine developed a problem with a sensor, or did it do this because the media didn’t detach from the roll?
Advice would be good, as I was almost considering sending the bill for a new head to the media supplier! Fortunately they are safe from both myself and my insurance company.
Finally, is there and insurance policy we can take out in case of major machine problems in addition to a maintenance contract or will a MT contract cover it?
Answers on a postcard please to:
NeedAcleanPairOfPants
PO Box TFFT!
KentBigMo
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9 Replies
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Had that as well. There doesnt appear to be any sort of sensor to tell the machine to stop printing over and over the same bit.
Ours did it for about 10-15 mins before I noticed but a nozzle wash of about 20 mins brought it back 100%.
I heard someone had this happen once after leaving the machine printing during a Bank Holiday weekend!
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The sensor works if the media just runs out… but unlike my rolands it doesnt give a motor error if it cant pull any through..
Taking longer to clean out my pants than it did you recover the head 😳
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Definitely scared the beejeezus out of me but its testament to the quality of the machine that it can be sorted out with a good clean.
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quote Jon Marshall:Definitely scared the beejeezus out of me but its testament to the quality of the machine that it can be sorted out with a good clean.
does give me more faith i must admit, but i’m in love with it anyway…. we can get through anything lol
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I already had similar problem on my CJV30 but there was a X (or Y) current overrun error detecting a problem for feeding the vinyl (the end of the roll was taped to the cardboard core) so printing stopped.
What I see on your JV33 is that it did not detected this current overrun. The behavior should not be different between CJV30 and JV33 so why is your printer not detecting a motor error? I would investigate in this area.
Hope you will find (cheap!) solution to recover your head.
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Thanks Fabrice…. Head fine…. So there is a problem then?
Perhaps Stafford will see this and share his vast technical expertise!
Big Mo
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This is too common an occurrence unfortunately. I’ve seen this happen on JV3’s before where the build-up was so bad, it stopped the head assembly in the middle of the carriage, heaters stayed on and all the media and vinyl melted itself into the 4 printheads, meaning all 4 had to be replaced. Other times, it’s lifted the media guide enough to make contact with the printhead and caused enough damage to buckle the metal plate around the head (JV33/CJV DX5) which has then gone back to the capping position and mangled the cap up for good measure!!
As for the motor, Fabrice makes a very good point. It could be that the printer is not holding the media tight enough to cause an X current (feed direction) error and the platen is slipping underneath the media so the printer is actually unaware that the media is jammed.
The only Mimaki’s I know that has the ‘head jam’ sensor is the JV5 and JF flatbed (probably JFX too).
Maintenace contract wise, although I will cover a machine for accidental and/or physical damage, I don’t think I would cover this, as it’s technically not a printer breakdown, it’s the fault of the media manufacturer. I would probably offer the labour and callout FOC but you or your supplier would have to pay for the part.
Fortunately you were able to get the printhead running again Mo, there have been many cases where the head/heads have been unrecoverable.
Stafford
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Thanks Stafford…. Have noticed though that the print isn’t as sharp now on smaller stuff, so I possibly think I may need to adjust the drop position again… But as far as the test print goes….. It’s fine…
Stafford, call me when you get a chance and let’s talk mt contracts… Need one ASAP..
Cheers buddy
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You got it Mo, I’ll give you a buzz in the morning if you’re about.
Try running the drop adjust in the morning as you say, if not I’ll tell you how to do it in service mode. Easy Peasy 😉
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