Canon ip5000 logic board problem

I have a canon ip5000 that's reporting an error code 6C00, for which the service manual simply sez "replace the main logic board..." Does anyone have experience with this fault? Any troubleshooting to be done for a root cause? Love this printer.. (platonically, of course) and hate to see it die. Also hate the thought of a couple hundred bux fer da board, if something else might be at fault.

Paul Nelson W5GNF              "When I go, I want to go quietly, in my
Ames, Iowa                     sleep, like my grandfather- not
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Paul Nelson
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