Rm1-2316 Schematic Link

is the primary Low Voltage Power Supply (LVPS) Board for several popular entry-level monochrome laser printers, most notably the HP LaserJet 1020 Canon LBP2900

The RM1-2316 is the official part number for the 220V–240V Power Supply Board (also known as the Low Voltage Power Supply or Engine Control Board) used in several popular monochrome laser printers, most notably the HP LaserJet 1020 and the Canon LBP2900 series.

If you can provide a photo of the component or the surrounding PCB traces, a definitive pin-to-pin replacement can be identified.

AC Line → Bridge Rectifier → Bulk Capacitor (C1, 100µF/400V)
                                |
                                +---> R_start (2x 150kΩ series) --> Pin 8 (HV)
                                |
                                +---> R_brownout (1.2MΩ) --+--> Pin 5 (B/O)
                                |                          |
                                +--- R_brownout2 (100kΩ) ---+--- GND
                                |
Pin 7 (OUT) --- R_gate (22Ω) ---+--- Gate of MOSFET (Q1, e.g., 4N60)
                                |
Pin 3 (CS) --- R_sense (0.33Ω) ---+--- Source of MOSFET
                                |
Pin 6 (SS) --- C_ss (1µF) --- GND

Common Myths About the Rm1-2316 Schematic

Myth 1: "It's just a transistor."
Reality: The schematic includes matching, feedback, and decoupling—essential for stable operation.
Myth 2: "Any RF amp with the same pin count will work."
Reality: Different modules have different gain slopes, bias voltages, and maximum power. Using the wrong one causes oscillation or burnout.
Myth 3: "The schematic is impossible to find."
Reality: Difficult, yes. Impossible, no. Many obscure modules have been documented by hobbyists.

Compatible New: Third-party manufactured boards, such as those from RODEX or AB Power Supply, which are often more budget-friendly.

depending on the region) into lower DC voltages required for the DC Controller, Formatter, and various motors. Manufacturer: HP Inc. (Original Equipment Manufacturer)

8. How to Obtain the Original Rm1-2316 Schematic PDF

Complete, original schematics are available from:

A proprietary hybrid IC module used in older Hewlett-Packard (now Keysight) test equipment, particularly spectrum analyzers and signal generators from the late 1980s to early 2000s.
A DC-DC converter control block that integrates power switches, a voltage reference, and error amplifiers into a single multi-pin package.
A component with no direct modern equivalent, making its schematic essential for reverse engineering.