High-voltage power supply circuit The printer contains three high-voltage PCAs (shown in figure 46) that are directly controlled by the controller board: Developer/imaging drum bias supply, which controls: • cartridge motor (M3) • imaging drum bias • black developing bias • color developing bias High-voltage power supply, which controls: • transfer drum • cleaning roller • transfer belt • post charging unit • upper fusing roller Separation discharge high-voltage converter PCA which controls: • transfer charger EN Electrical systems 167