bizhub 350 code 4721 need help

[yannii33]

I replace the print controller the mainboard many many boards and I'm still getting this cold 4721

can this be some kind of factory connector issue our connection any help appreciated

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[JR2ALTA]

Whats the code for?

[MCBIG]

Did you swap the IC from the original A board over to the replacement A board? If not, that will cause that code specifically.