HP Deskjet 3420 Color Inkjet Printer - Manual (Page 41)

replacing print cartridges
Before buying replacement print cartridges, verify the correct part numbers. For the
correct part numbers, see print cartridges .
When a print cartridge is empty, leave the empty print cartridge in the print cartridge
cradle until it is replaced.
To replace a print cartridge:
1. Press the Power button to turn on the printer.
2. Open the top cover.
The cradle moves to the center of the printer.
3. Push down on the print cartridge and slide it out of the print cartridge cradle.
1. press Power button 2. lift top cover
3. push down on print cartridge 4. slide print cartridge out of cradle
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