Without the manual, you would have guessed, ordered the wrong part, or broken the plastic clips. Given that the IR 2420 is an older analog machine (pre-2010), some may ask: Why bother?

Furthermore, parts for the IR 2420 (drum units, fuser films, rollers) are cheap and plentiful on eBay or AliExpress. With the service manual, you can keep this printer running for another decade. The Canon IR 2420 Service Manual PDF is an indispensable tool for anyone looking to extend the life of their printer without breaking the bank. It transforms a confusing brick of plastic and metal into a logical, repairable machine.

The manual provides the torque specs (do not over-tighten) and the adjustment procedure for the paper height sensor.

The manual instructs you to enter Service Mode > COPIER > FUNCTION > PART-CHK to run the pickup solenoid cycle without printing.

The manual tells you that the Separation Pad (Part #FB6-6942-000) is likely worn. It also notes that the pickup roller might be glazed.

Look up "Multifeed" or "Separation" in the PDF index. You are directed to Chapter 7 (Feeder System) and Chapter 9 (Troubleshooting).