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Tin Ho: OK, you were right. Eventually the infamous warning was given and the LED went off. So that leaves only the easy ink level check. Have fun, Bert

Closer inspection if my ip4200 reveiled another optical sensor, located left, behind the front. See http://members.lycos.nl/dmjbijzboek/Electronics/CLI-8-light-guide-sensor.jpg Its vertical position matches the top of the tapered lightguide or the CLI-8 and PGI-5 cartridges. This top ends in an...

Pictures: http://members.lycos.nl/dmjbijzboek/Electronics/CLI-8-inklevel.jpg Top: CLI-8 cartridge with light guide cut away Bottom: checking the ink level is easy now

Tin Ho I never disputed the function of the chip. I was aware of the function of the prism. However, I don't see the relevance of your remarks regarding the original thread, because you ignore the fact that my ip4200 does not respond in the regular way when confronted with a refilled cartridge...

The device denotes "Fusible Link" is a LED and has nohing to do with a fuse. On all my empty cartridges the gold wire is unaffected.

In reply to Tin Ho: You state in the same paragraph "The printer never detects ink level low, high or full. There isn't any mechanism there to do such detection" and "There is an optical sensor in the printer which can detect emptiness of the ink cartridges. When a cartridge is completely empty...

You missed the point. The normal behavior is that the printer nags about a refilled cartridge, resumes printing after 5 sec pressing the resume button and turning off the cartridge LED, etc. In this case it does not detect a refilled cartridge, althoug it really was. The tapered plastic part...

I used such a modified cartridge for the first time and it was not recognised as refilled, but a warning was given that it was found completely empty. that printing could be continueded by pressing the resume button and that the cartridge should be replaced a.s.a.p. 3 HQ A4 fotos were printed in...

By removing the tapered piece of plastic between the clip and the reservoir, the inklevel becomes visible when looking behind the clip. This should be possible when the catridge is mounted in the printer. Removing is done by bending the clip completely downward and then sawing just above the...