AMT Datasouth FASTMARK 4600 - Manual (Page 59)

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For unstable ribbon roll rotation, check the label path and make sure the head
latch is securely closed.
Poor printout quality:
 The ribbon may not be qualified.
 The media may not be qualified.
 Adjust the Darkness (heat temperature).
 Slow down the print speed.
 Refer to the following and clean the related spare parts.
Recovery
After correcting problems, simply press the CANCEL button or restart the printer.
Make sure the LED’s are not blinking and remember to resend your files.