The U6-02 is a tray #4 lift error, and totally unrelated to your NIC troubles. The most common causes of a lift error are:
1) that the paper guides are not snugged up to the paper. You see, the paper empty sensor is at the far left of the paper tray, and drops through that hole in the lift plate when paper is empty. If paper is present in the tray, but not contacting the paper empty sensor, the lift motor will continue lifting until it either tries to push the paper through the tray above and overloads, or it just times out after a certain number of seconds.
2) paper may be behind the tray interfering with the engagement of the lift drive coupler. Just remove the tray and look all the way to the back for paper jammed into the lift drive coupler.
To clear out the error: P * C*, 15, Start, 1: Yes, Start, CA
It does sound as if you have a defective NIC. =^..^=
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