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[DTG Brand] K3 slowing down after 4-5 shirts.. need help!

 
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Old May 23rd, 2011 May 23, 2011 5:45:07 AM -   #31 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

It is not the viscosity of the ink that would be causing the problem - more likely it is the fact that you print much more ink when printing white than when printing colors - thus causing the head to work more. I would suggest changing the head.
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Old May 23rd, 2011 May 23, 2011 7:41:51 AM -   #32 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Quote:
Originally Posted by Don-ColDesi
It is not the viscosity of the ink that would be causing the problem - more likely it is the fact that you print much more ink when printing white than when printing colors - thus causing the head to work more. I would suggest changing the head.
Sorry Don but you are wrong, if the visc is wrong the head will overheat quicker than when the visc is correct. Yes more white is used but it is designed to run at the correct temperature.

We have tested it here, above and below are as bad as each other, when its correct the head will run fine without overheating. Or the thermister is shot and its a red herring.
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Old May 23rd, 2011 May 23, 2011 3:09:47 PM -   #33 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Quote:
Sorry Don but you are wrong, if the visc is wrong the head will overheat quicker than when the visc is correct.
Oh, sorry Colin, I didn't realize they were using your ink.
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Old May 24th, 2011 May 24, 2011 6:43:42 AM -   #34 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

The point is, it might be correct at manufacture but could have changed during storage/transport causing the problem. This does happen with all brands of waterbased ink.

I have actually witnessed this "not my ink :-)" so it is a valid point.

No attack intended.
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Last edited by Rodney; May 24th, 2011 at 11:01 AM.. Reason: cleanup
 
Old May 24th, 2011 May 24, 2011 11:02:48 AM -   #35 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Thread note: some posts have been moved out of this thread. There is no need for crass language here to reply to questions. Let's keep things professional please.
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Old May 25th, 2011 May 25, 2011 7:33:14 AM -   #36 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

ok, again this is not a head problem.. Its the CR motor overheating. Clean the CR drive bar. Clean with lightweight oil. Clean it good. If the damage has already been done to motor then you will need a new motor. Also sometimes the main board start overheating if the motor poops out. If the head overheats on a k3 it stops printing.
 
Old May 25th, 2011 May 25, 2011 10:56:47 PM -   #37 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Quote:
Originally Posted by ubertech
ok, again this is not a head problem.. Its the CR motor overheating. Clean the CR drive bar. Clean with lightweight oil. Clean it good. If the damage has already been done to motor then you will need a new motor. Also sometimes the main board start overheating if the motor poops out. If the head overheats on a k3 it stops printing.
I tried cleaning the CR drive bar and replaced the motor. It didn't help so that is not the solution. I didn't replace the mainboard because I didn't have one but will try next time. What part of the maniboard do you think is overheating?
Also you should be aware that the printer started printing normally when I switched to printing white t-shirts, and it started slowing down again after few hours.
 
Old May 25th, 2011 May 25, 2011 11:01:10 PM -   #38 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Quote:
Originally Posted by Inkster UK
The point is, it might be correct at manufacture but could have changed during storage/transport causing the problem. This does happen with all brands of waterbased ink.

I have actually witnessed this "not my ink :-)" so it is a valid point.

No attack intended.
He is right here, we had a problem with Dupont ink probably being old or not stored at proper conditions. It wasn't the white it was magenta, and it clogged a completely new printhead! We flushed it and replaced the ink with new one and it works fine. We still use Dupont ink and have no problems with it!
 
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Old May 26th, 2011 May 26, 2011 3:36:40 AM -   #39 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

I do not see how the motherboard could cause a heat slow down problem. I would say the either one of the motors or the print head is causing the heating problem. The reason being that the printer works fine for a period of time, this lead to a heat (current) draw changing as either the pizzos are firring and not being cooled by the liquid passing over them or a motor heating up changing the resistance of its winding.
 
Old May 28th, 2011 May 28, 2011 3:58:28 AM -   #40 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

FYI, The issue of slowing down the firing rate when the head overheats I think is only going to occur on a 48XX machine and above, the smaller format machines which do not have built in Mircoweaving do not have this feature.
At least that is my understanding, while its the same head its the controller board that actually changes the firing rate.
So I dont think its the head.

On the viscosity of the ink causing more overheating, possibly different inks could make this worse or better, but I dont think so.
I actually reported this issue to Epson (took me 9 months to get a reply) and when I did I had the problem with Epson own ink (printing film separations), its due to the fact that we are overdriving the heads (its why Epson do not use these resolutions in there own driver) and soems some heads are more susepctable to this than others, just depends where it comes off the manufacturing line.

I have seen the issue on the 1800 and 1900 and its always been something else.

Best regards

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Old May 28th, 2011 May 28, 2011 5:59:49 AM -   #41 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

A mysterious "slowing down" problem actually drove a lot of folks crazy on the K3 for a while (1900 based). It turned out to be that the rail was getting "dry". A bit of oil on the rail on which the head rides cures the problem. If the rail is not sufficiently lubricated, the drive motor overheats and goes into an automatic slow-down mode.
Once the rail was lubricated it never happened again.

As far as resolutions, the Epson native driver (the one that comes with the printer) drives both the 1800 and 1900 at 1440x720, 1440x1440 and 2880x1440dpi. Support for these is also mentioned in the programming guide. These resolutions will not overdrive the head. I think most RIP products adhere to these.

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Old May 28th, 2011 May 28, 2011 6:21:34 AM -   #42 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Sorry Fred, I probably wasnt clear in my e-mail.

I reported the issue on the 4800 to Epson, Epson do not use 1440x1440 on this machine with there driver and I am sure you are well aware of the text in the programmers guide about its use by developers (I think the words are up to you to test) and it was at this resloution on this machine I was refering to not the 1800 or 1900 which as I said I have never seen having this issue.

I am simply stating what Epson told me about the 48xx series.

Best regards

-David
 
Old May 28th, 2011 May 28, 2011 9:10:30 AM -   #43 (permalink)
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Default Re: K3 slowing down after 4-5 shirts.. need help!

Quote:
Originally Posted by cavedave
Sorry Fred, I probably wasnt clear in my e-mail.

I reported the issue on the 4800 to Epson, Epson do not use 1440x1440 on this machine with there driver and I am sure you are well aware of the text in the programmers guide about its use by developers (I think the words are up to you to test) and it was at this resloution on this machine I was refering to not the 1800 or 1900 which as I said I have never seen having this issue.

I am simply stating what Epson told me about the 48xx series.

Best regards

-David
Yeah. That's what it says. Lol. Typical Epson ;-)
The fact is all those printers use the DX5 print head so the same rules apply. Without divulging any Epson confidential info (you know, the stuff they disseminate at the developer's meetings) I cant say "why" I know those resolutions are also perfectly fine on 48x0 series printers... But they are ;-)

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