Connect a third party solution to the internal USB port, and then verify it correctly functions.
Step 1: Remove the formatter cover
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Remove two thumb screws (callout 1), and then slide the cover o of the printer to remove it (callout 2).
NOTE: The thumb screws are not captive and are easily lost.
Figure 1-996 Remove the formatter cover
Step 2: Unpack the replacement assembly
1. Dispose of the defective part.
NOTE: HP recommends responsible disposal of the defective part.
http://www8.hp.com/us/en/hp-information/environment/product-recycling.html
ENWW Removal and replacement procedures 607