(PSB) assembly used in several classic laser printers, most notably the HP LaserJet 1020 series and the Canon LBP2900
: Because this board handles "live" mains voltage, the schematic highlights the high-voltage sections (the "hot" side) versus the low-voltage logic side, ensuring anyone working on it knows where the danger zones are. Sustainability : In an era of "planned obsolescence," the Rm1-2316 Schematic