How do I replace a toner cartridge?
To replace the toner cartridge, access it by pressing the front door release button and remove old cartridges gently without damaging contacts. Insert new genuine HP toner cartridges in designated slot, close the front panel securely. Detailed instructions are on pages 40 and 52.
From the official HP Laserjet Pro Mfp M428 M429 manual, page 41
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