Image forming devices including electrification control units

An image forming device configured to perform image formation by transferring, onto a recording sheet, developer images respectively formed with electrostatic latent images developed with developers of multiple colors, comprising:

• a first electrostatic latent image holding body configured to hold, on surfaces thereof, a first electrostatic latent image to be developed with developer of a first color;
• a second electrostatic latent image holding body configured to hold, on surfaces thereof, a first second electrostatic latent image to be developed with developer of a second color;
• a first electrification control unit configured to face the first electrostatic latent image holding body and to charge or discharge the surfaces of the first electrostatic latent image holding body;
• a second electrification control unit configured to face the second electrostatic latent image holding body and to charge or discharge the surfaces of the second electrostatic latent image holding body;
• a current controller comprising:
• a first drive circuit configured to control electric currents, which are supplied between the first electrostatic latent image holding body and the first electrification control unit, to be a first constant target current, and
• a second drive circuit configured to control electric currents, which are supplied between the second electrostatic latent image holding body and the second electrification control unit, to be a second constant target current;
• and
• a malfunction detector comprising:
• a single voltage detector,
• a first voltage monitor coupled to the single voltage detector via a first diode, and
• a second voltage monitor coupled to the single voltage detector via a second diode,
• wherein the malfunction detector is configured to detect malfunction of at least one of the first and second electrification control units when a voltage detected by the single voltage detector exceeds a predetermined value.