HP Officejet Pro K850dn Printer - Manual (Page 70)

Control panel
1. Press and hold (Power button).
2. While holding down the button, do one of the following.
NOTE Perform the next level of cleaning only if results from the previous level are not
satisfactory.
a. For level 1 cleaning: Press (Resume button) five times.
b. For level 2 cleaning: Press (Resume button) six times.
c. For level 3 cleaning: Press (Resume button) seven times.
3. Release (Power button). The printer begins the cleaning process.
To clean the printhead contacts manually
CAUTION Manually clean the printhead contacts only after you have attempted to clean the
printheads automatically. See To clean printheads automatically . Printhead contacts contain
sensitive electronic components that can be damaged easily.
1. Open the top cover.
2. Make sure the printer is turned on.
3. Wait two or three seconds and unplug the printer power cord.
NOTE Do not turn the printer off by pressing (Power button). This causes the print
carriage to move out of reach.
4. Lift to open the printhead latch.
62 Chapter 5 Maintaining and troubleshooting ENWW