Audrey Terminal: Intermittent Power Issue Diagnostic... | terminalfaults.org

Technical Background:

Grounding issues in electronic devices can cause erratic behaviour or prevent proper operation. Differential mode noise coupling can occur through the network cable shield when a ground loop exists. Insufficient or improper grounding can lead to voltage potential differences, causing current leakage and component malfunction. EMV/NFC readers are particularly sensitive to ESD, which can damage internal components.

Symptoms:

The Audrey terminal fails to power on when the network cable is connected. The terminal powers on normally when the network cable is disconnected.

Possible Causes:

Faulty network cable shield causing a ground loop.
Defective power supply unit (PSU) unable to provide stable voltage under load when the network cable is connected.
Loose or corroded grounding connection within the terminal's internal circuitry.
Electrostatic discharge (ESD) damage to the terminal's power management circuitry.
Signal interference from nearby electronic devices due to inadequate shielding.
Network cable introducing a voltage potential difference relative to the terminal's ground.

Solution:

1

Power cycle the terminal: Disconnect the power adapter for at least 60 seconds, then reconnect.
2

Inspect the network cable: Check for physical damage (e.g., cuts, bends) and ensure the RJ45 connectors are securely attached.
3

Replace the network cable: Use a known-good, shielded Cat5e or Cat6 cable.
4

Test a different network port: Connect the terminal to a different network port or switch to rule out network infrastructure issues.
5

Clean the terminal's exterior: Use a clean, dry, anti-static cloth to wipe down the terminal, including the power and network ports. Pay special attention to the touchscreen.
6

Relocate the terminal: Move the terminal away from other electronic devices that might be causing interference.
7

Inspect and if possible, replace the power adapter with a known-good unit of the correct voltage and amperage rating. Ensure it meets the manufacturer's specifications. Reference the device's regulatory label for correct specifications.

Safety Warning:

Do not attempt to open or disassemble the terminal. Doing so will void the warranty and may damage the device's tamper-evident security features, potentially compromising payment security and PCI compliance. Safe Handling: Always disconnect the power adapter before inspecting or cleaning the terminal and its cables. Ensure your hands are dry and the work surface is also dry to avoid electrical shock. Avoid working near liquids. Note: Lockout/Tagout (LOTO) procedures are not applicable in a Retail-Store environment; use Safe Handling practices instead.

Prevention:

Regularly inspect all cables for damage and strain. Clean the terminal's exterior with an anti-static cloth. Ensure adequate ventilation to prevent overheating. Use surge protectors to protect against power fluctuations. Implement cable strain relief measures to minimize stress on connectors. Employ shielded network cables to reduce EMI. Ensure the checkout area is properly grounded according to electrical safety codes.

Expert Tip:

Try a different power outlet. Sometimes, a faulty outlet can introduce noise or grounding issues. Also, try installing a ferrite choke on the network cable near the terminal to filter out high-frequency noise. If the terminal has a USB port, temporarily connect a USB-to-Ethernet adapter to bypass the internal network interface and see if the problem persists.

Frequently Asked Questions

•Was there any recent electrical work or modifications done in the store?

Recent electrical modifications can introduce ground loops or wiring errors.

•Are other devices on the same network experiencing similar issues?

Widespread network issues suggest a problem with the network infrastructure rather than the terminal itself.

•Has the terminal been exposed to excessive humidity or temperature fluctuations?

Environmental factors can contribute to corrosion and component failure.

Audrey Terminal: Intermittent Power Issue Diagnostic Report

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Was there any recent electrical work or modifications done in the store?

•Are other devices on the same network experiencing similar issues?

•Has the terminal been exposed to excessive humidity or temperature fluctuations?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: