We park a Konica Minolta bizhub PRO C500 equipment that at some point all had to reset (to reset the memory and Board) as it burned laser engine gave me no engine code. I changed the engine angled drive after installing laser black but my security streaks appeared and can not get rid of them. One copy is on magenta , one copy is on cyan.- descriptions security lines. in service mode the machine printing ok. in the working mode prin, copies in black (monocrom) copies is ok. color copies or color printig is on lines (security lines). please help

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