I have a L4-05 code for color developer drive motor. Sharp support assured me the PCU was the source of the problem after we replaced the motor without success. PCU was not a fix so we replaced dv units, drums, transfer belt in sequence to try to isolate the source. All dv units are turning properly. LSU test OK but 64-5 produces only black but there is a 1" band of M and Y on the transfer belt after the print. We are heading to shop for HV PWB. Has anyone else seen this issue?