Some previous A1 users have reported system failures, most of which were caused by driver malfunctions (burned-out or faulty drivers, resulting in 24V high voltage entering the MCU logic circuit through the damaged driver, which likely also damaged other drivers and components).
The PP-A1 circuitry lacked sufficient protection against this type of failure; it wasn’t until the new V3.X motherboard and the new CC1 header board that a satisfactory solution was implemented.
The new protection circuitry ensures that if a driver burns out, it will not affect other circuit components; in the worst-case scenario, only 2–3 nearby stepstick type drivers (which are easy to purchase and replace) will be affected.
To help previous PP-A1 users avoid these failures, I will soon update the designs of the older A1 header board and Y-carriage board by adding protective parts and make some PCBs. This will likely take 7–10 days from now.
If you have already encountered similar issues, please contact me by email to request replacement boards; if your system is currently functioning properly, you may also request spare parts, but your request will be handled later.
In your request: Please specify the motherboard version (V2.x/V3.x) and header board version (V1.x/V2.0); describe the symptoms/cause of the malfunction and the damaged components;
Cost: All previous A1 users are offered one opportunity to receive the new PCB free of charge ; You only need to provide your previous order number, detailed shipping information (including a phone number), and cover the shipping costs, which are typically 10–20 USD.