What voltage does the HP LaserJet Managed MFP E42540 require?
The printer uses 100-127 Vac or 220-240 Vac and 50/60 Hz. You should make sure your power source is adequate for the printer voltage rating, which is listed on the printer label. (Page 3)
From the official HP Laserjet Managed Mfp E42540 manual, page 3
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