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Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: Microman
Date: February 15, 2021 06:49AM
I am following a video on how to take apart a printhead that is getting an error, that it is not there.

It shows cleaning those 8 contact points where the springs sit. I notice that the one towards the top left shows a lot of green, and not a lot of the copper color. Is it toast, or is there a way to make those springs make contact with the circuit board?

Following this 13 minute video, guy uses what looks like an erasure and then maybe sandpaper at about 5 minutes into the video.

[www.youtube.com]

Thanks..





Edited 2 time(s). Last edit at 02/15/2021 06:54AM by Microman.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: Robert M
Date: February 15, 2021 07:00AM
Micro,

What make and model printer? For many, the print head is a consumable that requires replacement after X amount of time. The Officejet Pro 86xx series comes to mind. HP sells replacement print heads but they aren't cheap. The cost of the new print head can easily be more than the printer itself is worth.

Robert
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: space-time
Date: February 15, 2021 07:08AM
try a Q-tip with IPA to clean the pads and sand paper to clean the springs.

The guy does not show what is on the other end of the spring, in the bottom of those 8 holes. Is there another PCB there? how do you clean that? at least take the springs out and inspect, blow some canned air and the put the springs back.

and find a place without flies.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: cbelt3
Date: February 15, 2021 07:26AM
contact cleaning involves first 90% alcohol.
If still a problem. an ink eraser or 600 grit wet sandpaper will work, then clean with the alcohol. I"ve also used toothpaste and a small toothbrush in a pinch.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: Microman
Date: February 15, 2021 07:29AM
Those springs don't seem to show any sign of what they would do on the other end. On another exact printer like that HP 6700, all I see is the nipple for the ink cart. So maybe its a mechanical movement of some kind to show the cart is there at all.

Yes Flies.... mentioned in comments as sell on the YouTube site.

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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: mikebw
Date: February 15, 2021 08:02AM
Pencil eraser is a good place to start since most people have easy access to that. There are also contact cleaner sprays, which are handy to have around for various potentiometer (volume knob) cleaning needs.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: Microman
Date: February 15, 2021 09:08AM
I have eraser, and I have contact cleaner. Just worried that that one is really missing the copper contact and is really a circle of dark, Not sure if the spring will make contact. Mine don't look as good as YouTube video., but no flies

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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: mikebw
Date: February 15, 2021 09:22AM
Hmm, is there any way you could bend the spring to make it contact the area of copper that remains? I'm thinking maybe insert a bit of plastic/glue as a wedge to make the spring tilt to the side just a touch?

Otherwise try to put on a spot of solder after cleaning?
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: mikebw
Date: February 15, 2021 09:25AM
I wonder what would happen if you just bridged the springs, closing the circuit? No?
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: space-time
Date: February 15, 2021 09:37AM
Quote
mikebw
I wonder what would happen if you just bridged the springs, closing the circuit? No?

that's a good idea. Those 2 pads enclosed on the same rectangle (J8 - J12) look like part fo a circuit, and yes I could investigate to see what the springs are doing on the other side (*) and bridge the gap with a soldering iron if you know what you are doing.

* is there a metallic contact on the cartridge?

and were J11?
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: Microman
Date: February 15, 2021 10:51AM
I did the best I could, then reassembled. Think it has a new problem.... As it says the ink unit cant move, but it does move to the left. Each time I try, and then it bangs into the left side... Got it back together, and had the experience and felt I did what I could, no telling what might be wrong. or how close I came. I could keep it for some parts, but not necessarily the whole ink cart holder thingy...

Any recommendation on a printer that is reasonable on INK, and accepts 3rd party ink readily? I still will be using my other HP6700 and my daughters HP6700, as they seem to work great.

Thanks for the responses...



Edited 1 time(s). Last edit at 02/15/2021 11:08AM by Microman.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: space-time
Date: February 15, 2021 11:49AM
I have no idea how much ink costs on these printers. I know Robert M is the HP Inkjet expert here, LOL. Maybe.

Anyway if I had to get an inkjet these days, I would look into an Epson Ecotank since they take large ink bottles or pouches and the cost per page is supposed to blower than other inkjet. I think Brother also came out with a model with large ink cartridges to compete but I never looked into details.

I so hope the razor blade model goes away and we pay the real price for printers and ink. It's better for our wallets and for the planet in the long term.

[www.brother-usa.com]

[no, I do not have experience with these models, all I know is they probably want to compete with epson Ecotank, I guess]



Edited 1 time(s). Last edit at 02/15/2021 11:51AM by space-time.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: btfc
Date: February 15, 2021 12:44PM
A rear window defroster kit might work for the contact repair.
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Re: Fixing Printer Printhead, Suggestions on Copper Trace
Posted by: space-time
Date: February 15, 2021 12:54PM
Quote
btfc
A rear window defroster kit might work for the contact repair.

but is it worth investing if the change of success is not known?
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