PAX A920 Android System Recovery Diagnosis - Solar Faults | terminalfaults.org

Technical Background:

The Android System Recovery mode is a failsafe environment used for system updates, data wiping, and troubleshooting. It is triggered by specific key combinations during boot or by critical errors in the Android operating system. Potential causes involve corrupted system partitions, failed OTA updates, or hardware-level signal instability during the boot process. Voltage fluctuations or corrupted bootloaders can invoke this mode.

Symptoms:

The PAX A920 terminal is displaying the 'Android System Recovery' screen upon startup. The device is non-operational for payment processing.

Possible Causes:

Corrupted system partition due to interrupted software update.
Incompatible or faulty software system.
Hardware malfunction causing data corruption during boot.
Low battery voltage during a critical system operation.
External static discharge (ESD) affecting the boot process.
Intermittent power supply issue causing boot failures.

Solution:

1

Perform a soft reset by holding the power button for 10 seconds until the device restarts.
2

If the soft reset fails, attempt to clear the cache partition from the Android System Recovery menu (use volume keys to navigate, power button to select).
3

If clearing the cache fails, check the battery level. Connect the device to a power source and allow it to charge for at least 30 minutes.
4

Retry the soft reset after charging.
5

If the device still boots into recovery mode, contact PAX support or your service provider for a firmware re-flash.
6

Document the steps taken and the results obtained for troubleshooting purposes.
7

Ensure the power adapter is securely connected and functioning correctly.

Safety Warning:

Do not attempt to open the device casing. The PAX A920 is a PCI-PTS certified device, and opening it will trigger tamper detection mechanisms, rendering it permanently unusable. Safe Handling: Unplug the device from the power source before performing any cleaning or external maintenance. Avoid using excessive force when connecting or disconnecting cables.

Prevention:

Regularly clean the touchscreen with a dry, anti-static cloth. Ensure the device is connected to a stable power source during updates. Protect the device from extreme temperatures and humidity. Avoid cable strain on the power adapter and any connected peripherals. Implement ESD prevention measures, especially in dry environments.

Expert Tip:

Try performing a 'factory reset' from the Android System Recovery menu ONLY as a last resort and only if authorized by PAX support. Note that this will erase all data on the device. Connect a USB-OTG keyboard for easier navigation within the recovery menu if touchscreen is unresponsive. Check the power adapter's voltage output with a multimeter to ensure it meets the device's requirements (5V/2A typically).

Frequently Asked Questions

•What are the consequences of flashing the wrong firmware?

Flashing the wrong firmware can brick the device, rendering it unusable. Only use firmware provided by PAX or an authorized service provider.

•How can I prevent ESD damage to the device?

Use anti-static mats and wrist straps when handling the device, especially in dry environments. Ground yourself before touching the device.

•What is the correct procedure for cleaning the touchscreen?

Use a dry, lint-free, anti-static cloth. Avoid using liquids or abrasive cleaners.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the consequences of flashing the wrong firmware?

•How can I prevent ESD damage to the device?

•What is the correct procedure for cleaning the touchscreen?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: