Early this week, at a time when the 7900 was not in use, I noticed the machine was awake, light from its LCD glowing through the machine's cover. I'd not used the printer in several days.
The message on the LCD indicated the left ink bay door was unlatched. And it was. This has happened twice before (noted here, and most recently, here), both times with the left bay door. The printer has not been moved, bounced, rattled, or otherwise agitated, we've had no earthquakes lately. There's no external reason the door should unlatch.
I have to assume there's an issue with the locking pin (or its solenoid). Perhaps the pin is a bit shorter than nominal, or the solenoid (or whatever actuator is used) is slightly out of optimal alignment. Or, there's a ghost in the machine.
In any case, I've found the left bay door unlatched three times since April, 2013.
Simply pushing the door fully closed solves the problem. The LCD returns to its normal status display, and the machine goes to sleep as it should.
--Jay
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