Source Technologies STM.58B - Manual (Page 9)

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Insert and swipe the card in the direction of the arrow as shown in the
picture.
3-11 MSR usage
Optional
When the printer is installed initially or when you face a problem, you can run the
self test and check the information about
-Control Circuit, Mechanism, Print Quality, ROM Version
After checking with self-test and no issues are found, you can examine other
devices and software. This function is working independent of devices and software.
The sample of self test printout
♣ Motor protection from being overheated
The motor should be stopped and cooled about more than 30 seconds after
continuous printing 1.5 meter