Bizhub Pro 920

[hosbiz]

I'm having this Code SC 90 -01 on Bizhub 920.Check the ICP's on Main Board and ADU board and found them all OK. Checked also the voltages going to the ADU board -all are Ok. Any suggestions please.

[blaze2000]

If ADU is good, you may be looking at replacing PRCB.

[O sentinela]

clean the memory ddr or charge de firmware!!

[otomatic]

got the 90-01 on one of our machines and swapped out the adu board and the code cleared but now the fuser will not light up and stuck on copier warming up

if I put the old board back in and start the machine in tech rep the fuser works but nothing on the adu works I exit tech rep and it kicks the code again

I did find a blown fuse on the old board and replaced it but still did not work

is there some sort of reset I must do when changing these boards?
I also have changed the printer control board to no avail