An image forming apparatus has a photosensitive member, a plurality of corona chargers configured to charge the photosensitive member by corona discharge, a plurality of charge output circuits configured to output a charging voltage being applied to each of the corona chargers, a plurality of abnormal discharge detection circuits configured to output an abnormal discharge detection signal according to abnormal discharge occurring in each of the corona chargers, and a controller configured to have a common input port connected to the abnormal discharge detection circuits wherein the abnormal discharge detection signal output from each of the abnormal discharge detection circuits is input to the controller through the common input port. Each of the abnormal discharge detection circuits is connected to a corresponding one circuit out of the charge output circuits.

A multi-function apparatus includes a body, an image reading unit, a document cover and a locking member. The image reading unit is movable between a closed position and an opened position. The document cover is movable between a closed position and an opened position. The locking member is movable to a first position and a second position and includes a first engagement portion and a second engagement portion. In response to a movement of the document cover to the opened position, the locking member moves to the first position and locks the image reading unit to the closed position. In response to a movement of the image reading unit to the opened position, the locking member moves to the second position and locks the document cover to the closed position.

An image forming apparatus includes an apparatus body having an opening portion, an opening/closing member, a first unit configured to be attachable to and detachable from the apparatus body via the opening portion, a second unit configured to be attachable to and detachable from the apparatus body via the opening portion, an exposure unit provided in the apparatus body, a shutter member provided in the apparatus body and configured to move to a blocking position and a non-blocking position, and an interlocking mechanism provided in the apparatus body and configured to operate in an interlocking manner with the first unit, the second unit, and the opening/closing member. The interlocking mechanism is configured to position the shutter member at the non-blocking position in a state where the first unit and the second unit are attached to the apparatus body and the opening/closing member is positioned at the closed position.

A drum cartridge attachable to and detachable from a main body of an image forming apparatus includes a cleaning frame, a photosensitive drum rotatably supported by the cleaning frame, and an opening provided in the cleaning frame and configured to expose the photosensitive drum. In a factory default state of the drum cartridge, handling caution information is printed in at least part of a region of a surface of the photosensitive drum, the region being exposed from the opening.

An image forming apparatus includes an image bearing member, a developer bearing member, a fixing unit including a heating member, a rotary member which is heated by the heating member, and a nip area where the rotary member comes into contact with a sheet, and configured to perform fixing by heating a developer image transferred to the sheet and fixing the developer image to the sheet in the nip area, and a control unit configured to execute, while the fixing is not performed, a mode in which the image bearing member is rotated with the developer bearing member being in a separated position and the heating member is controlled such that a temperature of a portion of a surface of the rotary member, after the rotary member passes through the nip area, is maintained higher than the temperature of the portion during the fixing.

An intermediate transfer unit is attached to a position in the main body portion from a front side of the main body portion along the depth direction in a detachable manner. A cover portion extends in the depth direction and along a region of the outer circumferential surface of a rotating image carrying member that is more on a downstream side in a rotation direction of the image carrying member than the top region of the rotating image carrying member that is in contact with the intermediate transfer belt. A shield portion is provided on a portion of an upper surface of the cover portion that is closer to a front surface of the main body portion than the intermediate transfer belt. The shield portion has a taper surface that is inclined diagonally downward from a top surface of the shield portion toward the intermediate transfer belt.

A multi-function apparatus includes a body, an image reading unit, a document cover and a locking member. The image reading unit is movable between a closed position and an opened position. The document cover is movable between a closed position and an opened position. The locking member is movable to a first position and a second position and includes a first engagement portion and a second engagement portion. In response to a movement of the document cover to the opened position, the locking member moves to the first position and locks the image reading unit to the closed position. In response to a movement of the image reading unit to the opened position, the locking member moves to the second position and locks the document cover to the closed position.

A solid lubricant application device includes: a rotating body; a solid lubricant applied to the rotating body; a resilient urging member that causes the solid lubricant to abut toward a circumferential surface of the rotating body; and a guide mechanism that guides movement of the solid lubricant. When a straight line parallel to a direction in which the solid lubricant abuts against the rotating body is referred to as a first straight line, and a straight line parallel to a direction in which the resilient urging member and the solid lubricant are connected is referred to as a second straight line, the guide mechanism guides the movement of the solid lubricant such that an intersecting angle, which is a smaller one of angles formed by the first straight line and the second straight line, decreases as the solid lubricant is applied to the rotating body and accordingly changed in shape.

A multi-function apparatus includes a body, an image reading unit, a document cover and a locking member. The image reading unit is movable between a closed position and an opened position. The document cover is movable between a closed position and an opened position. The locking member is movable to a first position and a second position and includes a first engagement portion and a second engagement portion. In response to a movement of the document cover to the opened position, the locking member moves to the first position and locks the image reading unit to the closed position. In response to a movement of the image reading unit to the opened position, the locking member moves to the second position and locks the document cover to the closed position.

An image forming apparatus includes an image bearing member, a developer bearing member, a fixing unit including a heating member, a rotary member which is heated by the heating member, and a nip area where the rotary member comes into contact with a sheet, and configured to perform fixing by heating a developer image transferred to the sheet and fixing the developer image to the sheet in the nip area, and a control unit configured to execute, while the fixing is not performed, a mode in which the image bearing member is rotated with the developer bearing member being in a separated position and the heating member is controlled such that a temperature of a portion of a surface of the rotary member, after the rotary member passes through the nip area, is maintained higher than the temperature of the portion during the fixing.