Banding at HP T11xx

[vishop]

Re: Banding at HP T11xx

so far it is printing well. When it happens again, might check on that tube replacement.

[theengel]

Re: Banding at HP T11xx

If this is the second time that happened, then you're probably gonna have to replace the tubes.

[vishop]

Re: Banding at HP T11xx

If you've replaced the print head AND the ink cartridge with new ones, and still have the problem, then I would replace the tube assembly at this point.

Kiran

Replaced the Gray Ink, syringe out atleast 5ml of ink, then replaced the G-PK printhead, and print came out well.

[Kiran Otter]

Re: Banding at HP T11xx

If you've replaced the print head AND the ink cartridge with new ones, and still have the problem, then I would replace the tube assembly at this point.

Kiran

[theengel]

Re: Banding at HP T11xx

I can't recall what kinds of diagnostics images are on this printer, but I think they'd be more help than just regular print outs. What you really need is a large block of each specific color, so you can tell exactly which ones are banding.

[vishop]

Re: Banding at HP T11xx

A good news and a bad news...

I dismantled the machine we have here in the shop to the level of removing the ink tubing, the pipe or whatever it is called. Just want to visually check for any leaks, any air packet or anything unusual where air might come in. I was able to remove the pipe on the side of the ink tank and check visually.

Hello everyone,

I'm back on this, and so is the problem. Again there is banding on the print, exact same scenario as my initial post. Banding starts somewhere in the center of the prints. And this time, still the gray.

The thing i did above didn't worked though, but as suggested, just manually primed the gray tube, sucked out almost 5ml and immediately replaced the printhead G-PK.

Thank you by the way to all who have shared their ideas on this especially (Kiran,engel). Good thing i have this thread before. Helped me the 2nd time around

thank you everyone

[theengel]

Re: Banding at HP T11xx

Using the syringe is even easier than taking it apart. Just pull the heads off and do it. It literally take less than a minute.

You wouldn't be able to find a leak. The only way you would know there was a leak is if ink leaked out (this happens occasionally) or if air leaked in (this happens often). And many times, the only way to tell if air is in the line is to suck up about half of that syringe full of ink. If, while you're sucking, you get air bubbles, then you know your problem.

[vishop]

Re: Banding at HP T11xx

A good news and a bad news...

I dismantled the machine we have here in the shop to the level of removing the ink tubing, the pipe or whatever it is called. Just want to visually check for any leaks, any air packet or anything unusual where air might come in. I was able to remove the pipe on the side of the ink tank and check visually. On the side of the carriage/printhead, i did not bother continuing as the tubes are covered from the center going to that side, i removed the printhead though. I just assemble everything back and planned to use the syringe to suck in ink along with any air on the tubes if there is. The good news, i made a test first after i assembled everything and the problem of banding was gone. I made several pages including the very same file i printed before, no more banding. The bad news is there is one more machine that's having the same problem and i don't know what fixed it or if it is really fixed in the first place.

[vishop]

Re: Banding at HP T11xx

Yeah, i wasn't around when our users replaced the heads when the machine prompted them to. Anyway, replacing them again if needed to is not an issue at all.

[theengel]

Re: Banding at HP T11xx

Probably should have used the syringe first. You want to get the air out of the lines first, so that it doesn't make its way to the heads. But you're probably fine. It's just that if there's air still in the lines, and you replace the head, and then the air gets to the head, you have to replace the head again.

[vishop]

Re: Banding at HP T11xx

Hey Kiran,

Did the IDS diagnostics and everything went OK. Those bongo or lifters are properly lifting up and goes back in place. It prompted for a head replacement the other day and users replaced the Gray -PK and MK-Yellow. But when i tried to print an image with a more concentration on gray or light black, the same banding still happens, for any other color it does not. There is no way to visually check the pipes for air bubbles as they are covered.

We are using genuine HP inks, this all comes from our US branch, with all the box intact and sealed.

I dont know what is my next move is, i guess im gonna try that syringe thing. See if there is any progress.

[Kiran Otter]

Re: Banding at HP T11xx

Ah, somehow I missed that, sorry!

[Iowatech]

Re: Banding at HP T11xx

Also, I would like to know (as I've asked twice now) are you using original, genuine HP ink cartridges?? Or are they refills/refillable 3rd party inks?

Please check again, that question has been answered. I'm not sure how you read CTN, but the answer was in the last post on page two of this thread for me.

[Kiran Otter]

Re: Banding at HP T11xx

Also, I would like to know (as I've asked twice now) are you using original, genuine HP ink cartridges?? Or are they refills/refillable 3rd party inks?

[Kiran Otter]

Re: Banding at HP T11xx

I recommend the syringe method over the setup printhead method. The setup printheads are designed to allow air to escape until the ink reaches it, so if you have air in the middle of the tube but some ink towards the head, that ink will hit the setup printhead and stop it from allowing any more air out. Plus the syringe is reusable over and over.

If you're really desperate, I've seen these things on ebay for 'cleaning' a printhead.. and it should allow someone to prime the actual head.. but I think it would be much easier to simply replace the head.

For HP72 88 940 HP Z2100 Z6100 T610 T1100 Printhead Cleaning Kit Maintenance Kit | eBay

Plus I don't know where you're supposed to get the ink from. Another ink cartridge perhaps that you sucked the ink out of. Sounds like a recipe for a complete mess if you ask me.

Kiran

PS - Note what the ebay listing mentions: This tool is mainly for the problem of air-entering to the print head 、vertical and horizontal blank stripe printing.