For successful printhead assembly replacement, it is important to make sure the electrical contacts inside the product are as clean as possible.
The replacement printhead assembly comes with pre-moistened wipes.
Figure : Pre-moistened wipes
Use these wipes to clean the electrical contacts inside the product. As the wipes become dirty, discard them and use new ones.
caution:
Wiping the electrical contacts up and down or from side to side might damage the product. Wipe from the top of the electrical contact to the bottom of the electrical contact, in one direction only.
Figure : Clean the contacts