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HP Designjet 500 plus - magenta ink fails - but only on long prints

Discussion in 'Hewlett Packard HP InkJet Printers' started by guymark, May 7, 2019.

  1. May 7, 2019
    guymark

    guymark Printing Ninja

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    Hello.

    I am wondering of anyone can guide me a little on this please. I have an HP Designjet 500 which is running still on original HP inks (albeit old ones) and generally speaking the printer produces excellent quality prints all things considered.

    About a month ago, for the first time ever it decided an almost full magenta cartridge was basically empty. Chip not loose, brimming with ink. Frustrating but not massively annoyed as I had several spares and had bought them as a job lot for a very reasonable price.

    Resumed printing odds and ends with the replaced cartridge and everything seemed perfectly fine. I dismissed the problem with the old cartridge as simply a "dud one".

    Today (unlike most of my prints), I was printing some large photos for a friend and after the first couple, I noticed that towards the end of the print, the magenta was failing - and the overall hue of the photos obviously changed.

    I have run diagnostics (printed fine) but "lied" to the printer to make it do a printhead clean on the magenta just in case. Re-printed diagnostics and (still) perfect.

    I re-loaded the glossy media and printed a photo. JUST before it completed it, the magenta "ran out" again.

    Glossy paper taken out, plain paper put in and I sent a huge magenta block to the printer. I was waylaid for a few minutes (I think this might be important), and when I finally returned to the the printer and sent the image, it seemed to work fine at first - but after printing about 6 inches * 20 inches of solid magenta, once again the banding came in, and became progressively worse.

    I have removed the magenta cartridge, cleaned the "piercing pin" with a soft toothbrush and isopropyl alcohol - refitted the cartridge and printed again. In essence, no change - it works for a while and then "runs out" of ink until it has had a rest.

    If I leave the printer for a long time (an hour or more), I can print 1 photograph.

    It is as though either the pipe is partly blocked or something else is starving the printhead of ink. When the printhead finally gets ink however, the print is PERFECT - so I have doubts about it being the print head.

    I am not sure what to do next.

    I do have a refillable cartridge set which I could load with a mild printhead cleaner to "flush the pipes" but I thought I would check in here before I did anything else in case someone knows what it is likely to be.

    Sorry for a rather lengthy message, but I wanted to explain the steps I have taken so far and the one "clue" that happened a month or more back when the printer clearly thought a cartridge was empty when in fact it was brimming!

    Very many thanks

    Mark
     
  2. May 8, 2019
    PeterBJ

    PeterBJ Printer VIP Platinum Printer Member

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    This post by @MrBird has the service manual for your printer attached. See page 3-1 and on for ink supplies troubleshooting.
     
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  3. May 8, 2019
    guymark

    guymark Printing Ninja

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    Thanks for that. I do have the manual but although it refers to "recovering the printheads" I cannot find the specified procedure. I am guessing it is the printhead at fault now - as they have a built in reservoir and filter - so I am guessing the filter is blocked - even though it is not yet supposed to be at the end of its life.

    Thanks again for taking the time to find the for me link though :)
     
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