A technician brought in a LaserJet 4250 this morning. He'd put a maintenance kit in it yesterday, and ever since he'd been getting 13.01 errors -- 'jam in tray 2'.
I looked in the back of tray 2 as the machine attempted a pickup cycle. The pickup roller didn't turn; it just twitched a bit. I pulled out tray 2 and looked in the front; the pickup roller was in the wrong way around. 'Corrected it and the machine worked fine.
And the lesson is, whenever a problem crops up right after you've worked on a machine, RETRACE YOUR STEPS. Had he simply done that, the technician would have had the job done profitably, and spared himself a lot of needless travel.
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