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Old 12-23-2021, 06:24 PM   #3
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Join Date: Jun 2012
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Default Re: Reusing power supply from HP LaserJet RM1-5315

Based on the picture you provided (from amazon) there is no way to tell. Post clear hi res pictures of both sides of YOUR board and we may be able to trace the circuit.
There are two optocouplers on this board, one is likely for power supply feedback regulation, the other one could be the one that powers on the supply.

Last edited by R_J; 12-23-2021 at 06:38 PM..
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