Page 29 of 29

Re: Hacking the Xaar 128 printhead

Posted: Sat Aug 10, 2019 6:08 pm
by BlueTurtle
Okay sounds good. I’ve read your posts and as far as I understand you are using a vacuum pump and seal the head against it to vacuum the ink. I was thinking about using something similar.

Re: Hacking the Xaar 128 printhead

Posted: Fri Sep 27, 2019 3:55 pm
by Dretzz
Hello everyone, just a simples quention about the Xaar 128: I need two separate 36v power supply, or if i had one power supply with two outputs with 36v, can i use just one?

Re: Hacking the Xaar 128 printhead

Posted: Sat Sep 28, 2019 9:20 am
by Wonko
I used a single supply with a single output, but decoupled them. One supply should be as stable as possible at 36V, but does not need much power at all. The other one needs more amps, but is allowed to fluctuate more.

Separating is easy: split the 36V at the supply, run each supply through a diode first, then put a large capacitor and a few smaller ones between each line and GND. If line 2 needs a lot of power, the capacitors protect the supply, and the diodes decouple 1 and 2.

In a powersupply with two outputs, they may do just that inside. You can check that with a multimeter. If 36V.A and B have close to 0 Ohm between them, they are simply two connectors on the same supply. If they have 100kOhm or more, they are decoupled.

Re: Hacking the Xaar 128 printhead

Posted: Sat Sep 28, 2019 9:23 am
by davidk
I may advise to use a supply with adjustable output. My setup works best at 26...28V. If I raise the voltage I have too much satellite drops. Best voltage depends of ink viscosity. Yes, single supply with common ground. In fact all supplies (5V, 24V and 26...35V) have common ground. For high head voltage I use a dc/dc booster.

I use the same head from february with very good results!

Re: Hacking the Xaar 128 printhead

Posted: Wed Oct 02, 2019 5:54 pm
by Dretzz
Wonko wrote:
Sat Sep 28, 2019 9:20 am
I used a single supply with a single output, but decoupled them. One supply should be as stable as possible at 36V, but does not need much power at all. The other one needs more amps, but is allowed to fluctuate more.
And how much current would be the supplies? Should be sufficient one 1A and other 5A ?

Re: Hacking the Xaar 128 printhead

Posted: Wed Oct 02, 2019 6:52 pm
by davidk
I have a booster from 24V to 25...35V 3A max. But the head draws a very small current. Max 5W I suppose.

Re: Hacking the Xaar 128 printhead

Posted: Sun Oct 06, 2019 7:53 pm
by Braden
Hi everyone,

I am having some issues and was wondering if anyone else has run into something similar. If I let my Xaar setup sit for a while then come back to start working on it again, I can't get it to print. Then if I change some of the Arduino pin definitions it will start working again. Specifically I have had this happen with the READY pin and the nRESET pin on two different occasions. After switching to a new pin it starts printing again and then I can move it back to the old pin and still have it work. Any thoughts? I am wondering if its a problem on the Arduino side of things or the print head because READY is an input into the Arduino from the print head and nREADY is an output from the Arduino to the print head.. I want to move off the breadboard on to something more permanent but if I keep having to re define my pins every time I let it sit for too long then I'm stuck on the breadboard.

Re: Hacking the Xaar 128 printhead

Posted: Thu Oct 10, 2019 6:18 pm
by BlueTurtle
davidk wrote:
Tue May 21, 2019 9:33 am
Hi,

This is my setup. You can see the damper above the head, the capping station I built (with a silicone band gasket and peristaltic pump), the reservoir and of course a print sample. The sample print is 8 times overprint microweaved. My head has a full blocked nozzle and many nozzles are deflecting badly.
I have a brand new head but didn't install yet.

Priming was donme very easy, with the head pressed by capping gasket. Pump was sucking ink for about 10...15s in two times. After this I wiped manually with a tissue and it's ready for use.
Hey David, would you mind telling where did you find the fittings for that little reservoir and what they are called? I bought a couple of those but couldn’t get them to fill up with ink so I’m sure I’m doing something wrong.