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HP DesignJet T1500 36-in PostScript Printer

I have a DesignJet T1500 printer. Over the past couple months, I've had an issue with every Photo Black cartridge (727). When I put a new OEM cartridge in, it works for a few days, then randomly pops up with "Ink Cartridge Faulty" error message. I replace with a new OEM cartridge and go through it all over again: works for a few days then error message. I've been through six cartridges so far. I've tried the "turning it off, turning it on again." The firmware is up to date. I just bought some after market cartridges off ebay to see if the problem is in the new cartridges, but I'm not holding my breath. Any thoughts? Thanks!

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