Laser printers, especially older HP's, draw a lot of current. In my last job in IT support I was responsible for supporting over 2000 printers all across the US, Canada and Mexico from the corporate office. Whenever we moved a laser printer we always consulted the in house electrician to make sure the printer was not overloading the circuit. More than once I had seen the lights blink in a row of cubes every time the heat element cycled on a laser printer. That in itself can trip the arc faults.
VG
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