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Hi @nguyentai,
1) Turn the printer off.
2) Unplug the power cable from both sides (printer and outlet)
3) Hold the power-on button for 10 seconds and then release it.
4) Plug the printer directly to a wall-socket.
5) Turn the printer on.
If the error message reappears then the engine control PCA needs replacing.
https://support.hp.com/in-en/product/hp-laserjet-pro-m501-series/7837159/document/c05049258/
I hope that helps,
Cheers!
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