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Yes, I think you are right. Canon's code could be cracked but it would need a lot of data readings taken from different machines with as assortment of cartridges to do so.

Canonfodder, It is probably an IR device similar to an opto-isolator. If so, then the receiver would be a transistor switch that it would be possible to take a high impedance feed from without disturbing Canon's existing circuitry. It could be used to trigger a 555 timer to make an LED flash...

If the sensors are not being used, would they even be fitted?

Cannonfodders pin identification seems the more logical one. I can see from that how the LED is powered and the chip clocked. But I am not sure on a couple of points. 1. Why is the resistor connected to the middle soldered pin under the LED? There cannot be a fuse between the bottom (A) and...

Once again grandad is to be congratulated on providing a very comprehensive write-up. I have been forming my own views on this subject for some time but without a specimen to go on, they have been pure conjecture. What you have proposed makes very good sense, but there are a couple of things I...

Photographers whose customers are prepared to pay anything for a picture supplied in less than two minutes! :-)

I wouldn't be surprised if Canon have left the back door open for a modification to their printers if legislation in Europe or the US forces them to backtrack on their chipped carts. This might take the form of a device retrofitted in the cable feed to the heads, and it might be quite a cheap...

Even Steve's site has got it wrong. http://www.steves-digicams.com/2004_reviews/canon_ip4000_pg2.html In fact, IR light shines up through the cart base into the prism. When there is ink present, the light beam hits the ink/plastic-case interface and because there is little difference between...

ghwellsjr, Thanks for your very good explanation.

Thanks for the link. The writer is trying to differentiate between sponge and foam. But a sponge is an animal so what he is really saying is there are different types of foam made from different materials and with different textures and properties some are hydrophilic and others are...

It may possibly be a leaky black cartridge. To prove the point, try what I do when I refill. Blot the outlet and leave it uncapped. Then suspend the cart just above a piece of tissue and leave for five minutes. The cart should not shed a single drip during that time.

I've tried the Inkprocess site you mentioned and only found Mick Carlotta's statements knocking the opposition. I found nothing of the article on Sponges in Cartridges that you mention. How do I access them?

You talk of filling the cart 'properly' yet you have not described the 'proper' method. Should I assume you drill and fill through the top above the sponge, while leaving the reservoir vent open?

I'm using a Canon IP4000 which uses BCI-3bk, and BCI-6bk and colour. BS-print provides pigment for the 3bk and dye based for the BCI-6 carts. As I recall, they ask for your printer type when you order. FYI, I use 'Think' matt paper from Choice Supplies, and 'Unicorn' Photo Glossy' from Lidl. I...

I am using ink from these people. I've had no problems with it and I cannot see any discernable difference compared to OEM. http://www.bs-print.co.uk/canon-ink-refill.htm

I was wondering if you could fill when half empty (before the optical light triggered) to defeat the message, but apparently you cannot.

Websnail, Assuming you are now up and running with your IP4200 fitted with CIS, have you found out yet if it comes up with a low ink warning when it *thinks* it has run out of ink?

I think printer manufacturers will continue to make cheap printers and expensive ink as long as they can get away with it. When more of the public realise that there is much cheaper ink available and not at inflated OEM prices, then the manufacturers may have to rethink their policy. Can you...

I think the proposed resetting of the eeprom refered to the main one that's part of the microcomputer operating system for the printer and part of the main board. That is probably the one holding the warning messages. I think it probable that the chips on the carts will be slave micros that...

It's back again - on sale from 6th July.