HP LaserJet 3500 3550 3700 Maintenance Kit Installation - Cassette pickup roller & separation pad

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Remove the paper tray from the printer.

Look up into the printer cavity and you will find the cassette pickup roller.

Squeeze the pickup roller to the left, and this will free the right side of the roller so that it can drop down and be removed (see picture below)..

Install the new roller in similar order: line up the left side of the new roller first, push it to the left, and then swing the right side of the roller up to lock the new roller in place.

At the front of the paper tray is the black plastic separation pad assembly.

Use a flat blade screwdriver to release the two tabs on the separation pad which secure the pad to the metal plate shown below. Gently work the pad up and away from the metal plate. If it doesn't slide upwards easily, continue pressing the two tabs and slowly work the pad up until it is free.

Reuse the spring on the new separation pad. Place it securely on the bump of the new separation pad.

Line up the spring on the separation pad with the spring pedestal in Tray 2. Slide the separation pad down onto the metal plate in Tray 2. The restraining tabs will click and hold the separation pad in place.