U6-1 The main PWB failed checking the ROM.
Shut down and restart the copier. If it appears again U6-1, replace the main PWB.
U6-2 The main PWB failed checking the RAM.
Shut down and restart the copier. If it appears again U6-2, replace the main PWB.
U6-3 and U6-4 The main PWB failed to check the battery MNV (U6-3). Or the main PWB does not properly initialize the NVM (U6-4).
Follow the procedure in the development of memory to initialize the NVM, code 20-96. Shut down and restart the copier.
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