This new Canon C5550 has intermittently been displaying a message "Cannot recognize drum, may not be a Canon product". Sometimes all 4 drums, but can be any combination. Alarm codes 900010, 900011,900012,900013 show depending on which drums were not recognized.
Sometimes the message goes away when the machine is turned off and on. Machine works normally even with the message displayed. Durable counter goes to zero for whichever drums alarmed as though the drums were replaced.
I called Canon and replaced two boards they recommended, connection pwb and front driver pwb. Firmware is up to date. Haven't replaced drums since they are expensive and it doesn't seem to be one drum in particular.
If anyone has ideas I am interested.
Thanks
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