Electronics Repair Questions? Ask an Electronics Technician
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Try replacing the ribbon cartridge, also.
If that does not work - or esp., if the printer is not moving mechanically, obviously not imprinting onto the tape, then you have a defective printer portion, that will need servicing/repairs.
If you need to know where to take, or where to send, your SAM4S register or is printer portion for service-repair, let me know your local zip code, please.