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p21 is stabilization failure. Try and clean the IDC sensors that sit below the transfer belt. also you can initialize and stabilize a few times in service mode as sometimes this can rectify a P21 issue. If all fails then it could be the actual ITB causing the issue
P 21 Color shift test pattern failure.Relevant electrical parts is the image transfer belt unit. Wipe clean the surface of the transfer belt with a soft cloth if it is dirty.Change the image transfer belt unit if the transfer belt is damaged.Clean the 2 sensors located upper side of unit.
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