Digi Sm320 Service Manual Jun 2026

Remove the weights, restart the scale normally, and verify accuracy at various load increments. Error Codes & Diagnostic Workflows

If your labels have white streaks or faded text, the thermal head likely has adhesive buildup. Always shut down the scale before cleaning.

Span calibration must be performed after replacing the main PCB, load cell, or when the scale displays weight inaccuracies. Step-by-Step Calibration Workflow

The SM-320 will display specific error codes when something goes wrong. The service manual interprets these codes: digi sm320 service manual

To maintain accuracy (legal-for-trade), the scale must be calibrated regularly. The manual outlines the entry procedure (usually via a specific key sequence upon powering on) to access:

Relocate the scale away from AC vents. Install a power surge protector. Factory Reset & RAM Clearing

Digi periodically releases firmware updates to fix bugs or add features (e.g., new label formats). Before updating: Remove the weights, restart the scale normally, and

Calibration is critical for legal-for-trade operation. You will need certified test weights (e.g., 1kg, 5kg, 10kg depending on your SM320 model).

Disclaimer: Always follow safety guidelines, and if you are not a certified technician, consider contacting a professional for complex repairs to avoid damaging the equipment.

In service mode, look for PRINT DARKNESS or ENERGY setting. Typical range: 80-120. Higher values increase contrast but reduce head life. Span calibration must be performed after replacing the

When replacing components on the Main PCB, ensure the following core connections are checked:

Press and hold down the and [RECON] keys simultaneously (or equivalent keys depending on regional firmware versions). Turn the power switch ON while continuing to hold the keys.

Standard interfaces include 1x RJ45, 1x RS232, and 1x RJ9 cash drawer port. Operational Setup & Maintenance

Remove weight immediately. Check if the platter is rubbing against the housing. Recalibrate. or U_LOAD Underflow / Underload Platter is missing; or negative zero offset.