Here’s a visual representation of the Formatter Board (Logic Card/Main PCB Board) used in the Canon LBP‑2900/B series printers—commonly referenced by part numbers like RM1‑3126, RM1‑3078, and RM1‑3079. These boards look very similar across various listings for compatible or refurbished units.

What Is the Formatter Board (LBP‑2900)?

Core Function

The formatter board—also known as the logic board or main PCB—acts as the printer’s central processing unit, converting data from your computer into commands that the printer hardware can execute. It’s the bridge between your printing software and the physical printing components.

Common Part Numbers

RM1‑3126

RM1‑3078

RM1‑3079

Also sometimes referenced as RM1‑2404 or RM1‑3125 in various catalogs

Compatible Printer Models

Primarily used in Canon LBP‑2900B, but often compatible with older LBP‑2900 models. Always verify physical board layout before replacing.

Additional Terminology

The board may be referred to in listings as:

Formatter Card

Logic Board / Logic Card

USB Board

Main Board / Motherboard / Main PCB Assembly

Specifications & Availability

Why It Matters

Essential for operation: Without a functioning formatter board, the printer cannot interpret commands from your computer—leading to errors like “Printer not detected” or total print failure(Garg 

Fixes key issues: Common replacement part when diagnosing USB instability, communication failures, or other logic-level errors

Cost-effective alternative: Replacing the formatter board can be a practical alternative to buying a new printer—especially in environments with ongoing printing needs.

Summary

The LBP‑2900 Formatter Board (RM1‑3126 / RM1‑3078 / RM1‑3079) is a critical component in Canon LBP‑2900 series printers that processes and relays print data via USB. Available as refurbished, imported, or compatible units, the board is compact and typically offers a short warranty period. Replacing a faulty formatter board is often an efficient way to restore printing functionality.