I have been curious about a phenomenon that happens once in a blue moon where a unit will have the pinch roller arm loose in the machine. This usually has caused a shorted PCB or worse a damaged headstack! I think that this can happen if the unit was not left in the "Ship ready" condition before shipping. This moves the pinch roller to a place where it will not come loose if subjected to a heavy jolt while in transit.
Hold input 1 and 7 down when powering up machine and the first thing in self test mode is "0 SHIP". DO NOT PRESS ANYTHING ELSE BUT- Press play and it will move the transport until "ship rdy" appears. Unplug machine and don't power on again . (Power on returns it to normal condition.) Now it will ship safely!
Please keep this in mind when boxing ADATXTs and remind your customers to do this before shipping!
P.S. Unfortunately Original ADATs do not have a user setting for this and it only can be done by a technician. -GPB