HP Officejet Pro K850dn Printer - Manual (Page 72)

6. Carefully remove any ink from the contact pads on the printhead using a dry cotton swab or a
soft, dry, lint-free cloth that will not come apart or leave fibers behind.
CAUTION Only wipe the contact pads. Wiping the nozzles (located on the underside of
the printhead) can cause severe damage to the printhead.
7. If some residue remains, slightly moisten the swab with distilled, filtered, or bottled water, and
continue wiping until the contacts are clean.
CAUTION Avoid using drinking water or alcohol, which could damage the printheads.
8. After cleaning, place the printhead on a sheet of paper or paper towel.
9. Clean the contact points in the printhead slot inside the printer with a dampened cotton swab.
Before re-inserting the printheads, make sure all the electrical contacts have had at least five
minutes to dry.
10
. Plug in the power cord and turn on the printer. The control panel should still indicate that a
printhead is missing.
11
. Insert the printhead into its color-coded slot. Press down firmly on the printhead to ensure proper
contact.
NOTE If you are installing a new printhead, remove the new printhead from its package,
and then remove its protective tape.
12
. Pull the printhead latch all the way forward, and then press down to ensure that the latch is
properly engaged. You might have to apply some pressure to engage the latch.
64 Chapter 5 Maintaining and troubleshooting ENWW