¶ Lid Protection Alarm Triggered at Startup or During Operation
This guide explains how to troubleshoot and resolve the “Lid Protection” alarm that may appear during startup or while the machine is running. It helps identify issues related to safety interlock sensors, wiring faults, or control board failures, and provides a structured diagnostic process to restore normal operation.
A "Lid Protection" warning appears on the control panel when starting a job or mid-process, causing the machine to stop. The alarm persists even after clicking continue, restarting the job, or rebooting the machine.
The "Lid Open" icon is visible in the top-right corner of the control panel. In Menu > Diagnosis, the Lid Protection status button remains Red, confirming the safety interlock is triggered.
Open the bottom-right door panel to access the TL-Timer board. Observe the status LEDs on the board:
Check which specific LED is OFF. This will pinpoint which sensor is reporting the "Open" status. Note: The following steps use the left-side acrylic lid sensor as an example.
Take a separate magnet and place it directly against the sensor. If the signal on the motherboard does not change to "Closed," the sensor or wiring is likely at fault. Please note that you should place the magnet at the sensor location shown in the image below.
If the error follows the sensor to the new side, the sensor itself is faulty. If the error remains on the original side, the sensor is fine; proceed to check the wiring and motherboard.
Use a multimeter set to Continuity Mode to check the wiring corresponding to the inactive LED on the TL-Timer board.
If a short is found: The wiring is damaged and needs repair.
If the wiring tests normal: The TL-Timer board may be malfunctioning.
Please contact ONELASER After-Sales Support with your test results for further diagnostic help or to request warranty parts.
Important Reminder:
If these steps do not resolve the issue, please submit a support ticket on ZOHO: https://zohodesk.1laser.com/portal/en/newticket. A technician will then be able to conduct a more in-depth diagnosis and resolve your problem.
