The SM320 displays cryptic codes like E-01, E-26, or Ad. Without the service manual, these are just annoying letters. Inside the manual, you will find a full diagnostic table explaining that E-01 indicates an A/D converter failure, while Ad suggests an unstable weight signal.
The service manual provides a comprehensive error list. Here are the most frequent ones:
The Digi SM320 Service Manual is a critical document for component-level repair, but it is difficult to source officially. Use this guide as a functional roadmap: focus on power supply, serial console recovery, and cellular module replacement. For most hardware faults, replacing the mainboard or upgrading to a newer Digi router is more cost-effective than locating the original manual.
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.
Need further help? Provide the exact symptoms (e.g., “Power LED on but no cellular registration” or “Serial port outputs garbage”), and I can give targeted steps from the typical SM320 service logic. digi sm320 service manual
DIGI SM-320 is a dual-function digital scale designed for retail and production, combining electronic cash register (ECR) capabilities with high-speed label printing Core Functionality Dual Operation
: Acts as both a price-computing scale and a point-of-sale terminal with receipt or label printing High-Speed Printer
: Features a built-in thermal head printer with a maximum speed of 105 mm/sec and a lifespan of approximately 100km Capacity Options : Available in multiple weighing ranges: Advanced Memory : Standard 2MB non-volatile memory stores up to 8,300 items (PLUs)
, with optional upgrades to 4MB or 8MB for up to 38,000 items Hardware & Interface The SM320 displays cryptic codes like E-01 , E-26 , or Ad
: Dual-line backlit FSTN LCD (202 x 32 pixels); specifically displays tare (4 digits), weight (5 digits), unit price (6 digits), and total price (7 digits) Keyboard Layouts SM-320B (Bench) : 32 preset keys SM-320P (Pole) : 56 preset keys on a raised display rack SM-320BS (Self-Service) : 120 large quick-selection keys Connectivity : Integrated , and a RJ-11 cash drawer port; optional (802.11a/b/g/n) is available Service & Maintenance Features SM-320 | Retail - DIGI (TERAOKA)
The Digi SM-320 is a retail scale designed for high-speed performance and efficiency in prepacking and storefront operations. While specific full-text service manuals for the SM-320 are often proprietary to authorized dealers, documentation and resources from the DIGI SM-series (including the SM-100, SM-300, and SM-120) provide a consistent framework for servicing and maintenance. Service & Technical Overview
The service documentation typically covers the following critical areas for authorized technicians:
Setup and Mode Changes: Instructions for navigating between Registration, Program, X (Read), and Z (Reset) modes to perform maintenance or reporting. JTAG header (unpopulated, but pads exist for boundary scan)
Memory Initialization: Procedures for clearing scale memory (e.g., using specific key combinations like . + Power ON) to reset specifications or clear data conflicts.
Calibration: Software-based calibration steps to ensure weight accuracy, often involving specific "SPEC" settings (e.g., SPEC 49 or 150 for interface configurations).
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
Servicing the SM-320 involves managing several internal programmable files: DIGI DC-200/300 Service Manual, V1.37
The service manual is distinct from the operator’s manual. While the operator’s manual explains how to use the scale for daily tasks (weighing, printing labels, PLU management), the service manual is intended for qualified technicians. Its primary goals are: