Don't typically work on scanners and am having a (maybe) strange issue with a Canon DR-7550C. The pickup roller isn't rotating while the feed and seperation rollers are. When the tray lifts and actuates the sensor (I cleaned it), the pickup roller lifts slightly (not contacting the media to be scanned). I could see there is a plunger type solenoid that "drives" that roller (just had an issue with duplexing on a CP4525 that uses plunger type solenoids). I downloaded the service manual, parts list and driver for this scanner. It looks like the diagnostic application gets installed with the driver. Haven't been back yet. Was just wondering if anyone has worked on these and has seen something similar.