"tony sayer" wrote in message
...
One by one, I added 'empty' genuine cartridges, and each time, it read the
cartridge ok. I eventually got to a full house, and all was well. So one
by
one, I put my cheapo cartridges back in, and all remained ok, until the
very
last one, dark magenta, when back came the message that all six cartridges
were missing. I went and got another from my stock and put it in, and all
was still ok.

So I'm guessing that the comms to these cartridges are just a simple 2
wire
bus, and each colour just has its own address to allow the processor to
read
them individually. I'm also guessing that the faulty dark magenta
cartridge,
must have a short on one of the bus lines so that when the processor
issues
the addresses in sequence to read each cartridge at boot up, none of them
are able to reply so the machine assumes that they are not present.

How easy it would have been for the printer to have just got chucked in
the
bin, for what was ultimately a simple problem ...

Arfa


Vairy interesting..

One wonders if there was One naff cap, then what others are lurking?..


I ESR'd all the rest, and they were all good ...

Arfa



Tony Sayer