Le pignon ne s'allume pas

@Alainahallam123, Welcome to the HP Support Community!
 
Make sure the Sprocket is charged for at least 30-60 minutes before powering ON.
 
Reset the sprocket

Remove the paper cover.

Locate the Reset button.

With a paperclip or pin, press and hold the Reset button until the Charging Indicator light turns off.

Replace the paper cover, and then turn on the printer.

 
Let me know how this goes.
 
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