Got me baffled. I partially-disassembled a used Epson cart. for an RX-580, and what I found made little sense. Also curious how "chip resetters" work.
Sorry if this has been recently answered. [inkjet cartridge] at the Repair FAQ came up null.
TIA, indeed!
Regards,
-- Nicabod =+= Waltham, Mass. eternally curious
Most of them don't. They store the ink level in the chip (100%). As the ink gets used, the computer updates the chip with the amount left by subtracting about what it thinks was used.
There have been all sorts of software mechanisms (and lawsuits about them) to prevent someone from updating the chip to reflect filling the ink well.
HP used a different mechanism, I don't know what they use now. They had a chip permanently programed with the serial number of the cartridge and the printer kept track of them. It could only hold 3 in memory, so if you had 4 cartridges, or used tape to change the reading of the serial number (blocking contacts), you could reset it.
Geoff.
-- Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM
left by subtracting about what it thinks was used.
Aha! Reminds me of laptop battery "charge remaining" estimators.
Thanks much!
Argh -- lawsuits, no less. Although the **AA are almost (?) terrorist orgs., I don't consider ink cart. vendors to be quite as bad.
-- Nicabod =+= Waltham, Mass.
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