Question about HP Deskjet 6940 InkJet Printer

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Repair damaged circuitry to black ink cartridge

I have just aquired a 6940 printer. However, there is some damage to the ribbon circuit that feeds the black print cartridge. It appears that the metal spring holding the cartridge in place has become dislodged and has pierced the ribbon circuit breaking one of the tracks. I would like to know the best/easiest way of removing this part of the circuit so that I can make repairs to it.

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  • belmont31 Nov 07, 2008

    Thanks for the advice frcs68, however I have managed a repair. I was able to scrape away the top coating of the broken track thus exposing the circuit below, and using some fine copper wire and a very steady hand I was able to solder the wire across the break, and cover up the repair with some electrical tape. I was also able to do this with the ribbon still in the printer by just removing the housing for the cartridges. The printer is now working 100%


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The ribbon i sprinted on a flex. it is non-repairable.
if you want. get some of the older ribbon (used for the IDE hard drive). but you need to unsolder the connecting connector and solder the ribbon directly to the ckt board. not a easy task, specially the components and feed through is getting smaller.

Posted on Nov 07, 2008

  • Frank
    Frank Nov 07, 2008

    good deal!


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My epson stylus rx595 is printing lines on evrything how can i correct this issue asap

I'm assuming these are lines going across the paper and are regularly spaced about the distance covered by one pass of the ink cartridge carrier.

The most common cause is a problem with an ink cartridge. The quickest solution is to replace the ink cartridge(s) if you have new ones on hand. Well-defined, one pixel-wide lines of a particular color are caused by a leaky ink jet (sometimes if the leak is severe they will spread out or have blotches along the line. Smeary lines are caused by lint on the bottom of the head. Blank lines, or lines missing a color, are caused by a clogged jet.

The next most effective solution is to clean the bottom of the ink cartridge by gently wiping it with a cotton swab soaked in isopropyl alcohol (available at drug stores). Unfortunately, most Epson printers will refuse to use a cartridge that has been removed and put back in the printer. You may be able to fool the printer by opening the cartridge cover, then pulling the power plug and USB cable as soon as the cartridges move to the middle for changing. Then you can remove, clean and replace the cartridges before your reconnect the cables. While you have the cartridges out, polish the electrical contacts on the cartridges and inside the printer, using a clean, soft white pencil eraser of the type typically found on mechanical pencils (especially if you are getting blank lines).

Occasionally, a blank line is caused by a bad connection between the traveling cartridge ribbon cable and the printer logic board. In this case, a new cartridge will have exactly the same problem as the old one. This can sometimes be repaired by disconnecting and cleaning the ribbon cable at the logic board if it has a removable connector with a pencil eraser. (Note - if the connector has a locking slide collar or flip-up latch you need to unlock it before pulling the ribbon; otherwise, the ribbon simply pulls out). Some printers use crimp-on fittings instead of a removable connector; the only thing you do for this is squeeze the crimps a bit tighter with pliers and hope it works. The hardest part is disassembling the printer so you can get at the other end of the cable. This can take quite some time, so you'll have to decide whether it's worth the effort.

Note: do not touch the electrical contacts in the cable or the cartridges with your fingers. Static electricity discharge from your body can damage the circuitry. Similarly, if you end up trying to clean the other end of the cable, avoid touching the circuitry on the circuit board, or the contacts on the cable if the ink cartridges are installed.

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How do you get the ink cartridge out of the printer

  1. Unplug your Kodak Photo Dock's power cord. Pull the black tab on the right side of the printer down to open the ink cartridge door.
  2. 2 Push up on the green cartridge release tab in the upper center of the ink cartridge to release the old cartridge. Pull the old ink cartridge carefully from the Photo Dock.
  3. 3 Rotate the new ink cartridge's ribbon wheel on the side of the cartridge clockwise with your finger to remove any slack in the film. Do not rotate the wheel too much---this will damage the cartridge.
  4. 4 Insert the new ink cartridge into the Photo Dock with ribbon film facing down until you hear the cartridge click in place. The ink cartridge will only go in one way.

    Do not touch the ribbon with your fingers. Handle the cartridge by its edges.
  5. 5 Close the ink cartridge door and plug in your Kodak Photo Dock's power cord.
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1. replace a new one or secure other cartridge w/ same spec of ur current cartridge.

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