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Canon i550 Service Error 5100 Message

Gota' Canon S-9000, issuing a "7-blink error code"-
#1. How do I enter the Service Codes reset area?

#2. Where can I get a definitions & reset 'menu' for all the error codes on my S-9000?

Page 2.

The
problem started with ink clogs in the printhead. I bought another one
from Canon (about $65.00 cuts), it went OK for 6 mo. then another clog
problem - I could see, this was going to get expensive!

I pulled
out the old Printhead to do experimental 'brain surgery' on it. I [very
carefully] unscrewed the (actual) printing head from the bottom of the
inktank cartridge and carefully lifted it back. There were the (6) Ink
Ports!

I litely cleaned (and flushed) all 6 nozzle ports clear
of all ink residue (plus the strainer ports above), and re-assembled.
Installed (6) new ink tanks [and waited a 1/2 hour for ink to purge air
out of head ports].

Powered-up and of course got the "7" fatal error code blinks and no action from the printhead. "Good Grief"!

Last question on this run - In removing the actual