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This prevents other customers from accidentally swiping a card reader on a machine that is already running. The Technician Card has a unique feature that allows resetting the cycle time to stop and restart a machine for testing purposes.
To reset the cycle time:
Insert the Technician card while the machine is running and quickly remove it. After a few moments, the cycle time will reset and the card reader will be ready to accept another card.
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Note that this process only works if thebTechnicianthe Technician's card that started the machine is trying to stop it. Otherwise, you must go to the X-Changer to stop a machine's timer.