Banding at HP T11xx

[fixthecopier]

Re: Banding at HP T11xx

[ATTACH=CONFIG]29525[/ATTACH]


The one on top is from our shop, the one below is from our client, both banding is happening, it means that both of them are having the same problem?

If you can print other prints on these machines that are fine, you do not have a machine problem. The issue is with the file, the firmware or the drivers. Unless someone can explain how a machine can mess up for one file, logic says it is the file.

[Kiran Otter]

Re: Banding at HP T11xx

KIRAN, where is this bongo pumps/filter you're talking about, how to check them?

And i am looking on a starvation on the gray ink?

iss.jpg

(They are lifters, not filters.) They are located in the ISS underneath the ink cartridges. They push upwards into that rubber bulb in the bottom of the ink cartridge and pump the ink from the cartridge into the tube assembly. If you remove all the ink cartridges and turn the printer on, during the initialization it will move these up and down once.

Have you physically checked each ink cartridge to make sure none are empty? Are you using genuine HP inks, and not refilled/refillable cartridges? This is extremely important.

Run the IDS diagnostic, it will also test the bongos, checking that they move up and down when expected, then you hold down each one and have it test the movement. Just follow the service manual.

Kiran

[Iowatech]

Re: Banding at HP T11xx

I agree with fixthecopier. And as you have changed the firmware and drivers and nothing happened, I'd be suspicious of the file format. I'm a little more suspicious that the print defect happens on two machines when printing the exact same file. Especially as both machines apparently print everything else without that print defect.
The fact that you could print the images with no problem on the 4000 makes me even a little more suspicious. While not always the case, machines with larger model numbers can sometimes be more advanced and can handle more file types than machines with smaller model numbers.
If possible, could you let us know what kind of file is causing this print defect?
If you have already shared that, I missed it like a dummy and I apologize.
And now, for something completely different - have you tried unplugging the machine's power cord for a while? Sometimes fluctuations in the power supplied from the wall outlet can cause machines to behave really weirdly. This is kind of a long shot, but you might wish to consider trying that if there have been energetic storms or construction in the area.

[vishop]

Re: Banding at HP T11xx

Hi,

I checked the machine base on the doubt that this may be due to ink starvation. I looked for a file that is the same or almost same amount of color as my test file is. There it is, banding happens a quarter part after starting the print.

Sorry for the confusion, as i have mentioned earlier, i no longer used my test file as reference for troubleshooting. As per Kiran's analysis of ink starvation, i looked for another file that is almost the same color quantity as my test file.

Test File = PDF format, full image, can be seen on my initial post.
Second File = JPG format, full image, recent post

I may have troubleshoot the printer wrongly as i printed the internal demo page which is a map and is more on cyan and yellow. And the other file i have printed before was of different color concentration.

When i printed now another file with almost same color comparison, i also got the banding.

right now im concentrating repair on our machine as both are showing same symptoms, i think if i fix this one, i could also apply the same thing and fix the client's machine.

please bear with me. totally confused.

[vishop]

Re: Banding at HP T11xx

[ATTACH=CONFIG]29528[/ATTACH]

(They are lifters, not filters.) They are located in the ISS underneath the ink cartridges. They push upwards into that rubber bulb in the bottom of the ink cartridge and pump the ink from the cartridge into the tube assembly. If you remove all the ink cartridges and turn the printer on, during the initialization it will move these up and down once.

Have you physically checked each ink cartridge to make sure none are empty? Are you using genuine HP inks, and not refilled/refillable cartridges? This is extremely important.

Run the IDS diagnostic, it will also test the bongos, checking that they move up and down when expected, then you hold down each one and have it test the movement. Just follow the service manual.

Kiran

None are empty, all are genuine HP inks fresh from the box, sealed coming from our US office. I'll have a check on that bongos...

thanks

[vishop]

Re: Banding at HP T11xx

And now, for something completely different - have you tried unplugging the machine's power cord for a while? Sometimes fluctuations in the power supplied from the wall outlet can cause machines to behave really weirdly. This is kind of a long shot, but you might wish to consider trying that if there have been energetic storms or construction in the area.

Yeah it is a long shot, but ill try it anyway.

[theengel]

Re: Banding at HP T11xx

I had not seen the example you showed in the first post... sorry.

I would say ink starvation or air in the printhead. I've had heads with air in them that would print fine and then slowly die out. It looks like banding, but it's more that the nozzels are missing rather than the lines overlapping.

If the ink tubes are primed, I would replace the printheads. Looks like grey.

In fact, grey would make sense because not all prints have that color in them. So it would show up more in some than others.

[vishop]

Re: Banding at HP T11xx

Hi,

How do i prime heads? do i still need a priming heads for it? or i can use the working printheads in there?

[fixthecopier]

Re: Banding at HP T11xx

Hi,

How do i prime heads? do i still need a priming heads for it? or i can use the working printheads in there?

You must use set up heads to prime.

[theengel]

Re: Banding at HP T11xx

If you have air bubbles in the ink tubes, you'll probably have to replace them. I don't know if you can prime those with a syringe or you have to buy the set-up heads, but one of those should come with new tubes. Try the rebuilt ones from LPS. But you'll also have to buy a new grey printhead, because as far as I know, there's no way to get air out of the printhead itself.

But before any of that, you'll want to check the stuff Kiran went over.

Actually, looking back at the thread, it was Kiran's first suggestion. There's even a link pointing to the syringe. That's for air in the lines. Get the air out of the lines, and then if it's still happening, replace the heads. This thread is way too long for this problem.

[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.

[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?

[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

Ah, somehow I missed that, sorry!

[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.