HP DesignJet 500 - Manual (Page 234)

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Roller Lubrication Kit
Use this kit If the rollers on the platen are making a
squeaking noise due to the fact they need lubrication.
1. Open the window.
2. Using the bottle of oil which is supplied with this kit
apply 10 drops of oil into the part of the platen
show below:
3. Repeat the process until all of the holes in the
platen have had a 10 drops of oil placed in them
4. Be careful not to spill oil onto the platen. If there is
excess oil on the platen: wipe it away with the cloth
supplied with the kit and close the window.