What does error code U1-2320, U1-2330, or U1-2340 mean and how do I fix it?
These error codes indicate a Fuser Unit Failure. The recommended troubleshooting action is to turn the machine off and then back on. If the issue persists, further service inspection of the fuser unit is required.
From the official HP Samsung Xpress SL M2020 Laser Printer Series manual, page 70
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