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Fault diagnosis

Answer a few questions to narrow down the cause. The steps follow the order technicians actually use: rule things out from the outside in, from cheap to expensive.

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What to do

Suspect hardware failure or interference

  1. Check connectors and screw terminals — vibration loosens them over time
  2. Test continuity along the whole run, especially where it shares a cable tray with power wiring
  3. Try the device on another COM port of the machine to tell a bad port from a bad device
  4. Intermittent errors point to interference — consider optically isolated ports

Tried everything and still stuck?

Describe the symptoms and what you have tried — an engineer will call back to help.

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Symptom: Suspect hardware failure or interference

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Before opening the machine. Disconnect power, wait for capacitors to discharge, and photograph the current wiring. If the machine is under warranty, call us first — opening it yourself may void the warranty.