I have HP Designjet T520 when I switch it on it has error 42:10 and then I deside to change CQ890-67023 AmpXL Main PCA Pro
and then problem still persist and then I change CQ890-67006 AmpXL 24 Carriage motor SV/Unity But still problem is the same please help me to know what could be the problem!!!!!!!!!!??
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