Mitsubishi Electric HP120TNU-A Service Handbook page 359

[9-4 Maintenance LED Display and Troubleshooting ]
(5) Maintenance LED displays "Er02."
(Meaning or Cause)
Software rewrite is suspended due to a problem with the USB memory stick during the software rewrite process.
For example, if the USB memory stick is disconnected during data storage, this display appears on the maintenance LED.
(Solution)
Check the connection of the USB memory stick.
If no problems are found, follow the procedure starting with the step explained in 1. Operation procedure (1) Starting software
rewrite mode under [9-3-2 Rewriting Software].
(6) Maintenance LED displays "Er10" or "Er11."
(Meaning or Cause)
Because there was a problem in the control board during the software rewrite process, software rewrite has not been com-
pleted.
(Solution)
Try rewriting the software again by following the procedure detailed in 1. Operation procedure (1) Starting software rewrite
mode under Section [9-3-2 Rewriting Software]. If the problem persists, rewrite the software, using a ROM writer.
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