Digi Sm320 Service Manual __link__ -

The Digi SM-320 is a high-speed thermal printing scale designed for retail environments, featuring both label printing and electronic cash register (ECR) functions

4.3 Cellular Module Isolation

• Remove the module (if socketed) and power on. Does the mainboard boot and LEDs show partial status? If yes, module is faulty.
• Replace module with a known-working MC8775 (or MC8790 with reflashed firmware).

If you must repair, combine this guide with generic cellular terminal service knowledge and careful probing. Always start with the serial console—it reveals 80% of SM320 firmware and boot issues.

Connectivity: Technical specs for Ethernet (Coaxial/Twisted Cable) and RS232C interfaces used for linking the scale to POS systems or label printers. Common Service Files & Programming