> > This is why I suspect the newest cartridges now have one of those
> > serial number chips in it. If it was an EPROM with the count in it,
>
> The refiller I've been talking about is a franchisee, and she and the
> others have sussed out the Epson cartridges and how to reset them
> after refilling. They have tried and failed to do the same with the HP
> cartridges, so an ID chip sounds likely
>
Hmmm, maybe there are two mechanisms. An ID chip would identify
the cartridge to the printer, but not the state of fill. And a refilled one
works perfectly well in any other printer, so it isn't damaged. I think I
should ask her to try and get a cartridge to go under the knife. Dare I
ask HP why my refilled cartridge doesn't work ?

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