Konica Minolta bizhub C658 Service Manual page 1809

bizhub C658/C558/C458/C368/C308/C258
[3] Transport motor (M1)
5.2.2 Developing section/Y, M, C drive mechanism
• Rotation of the developing motor transmits drive to the developing drive gear Y, M, C, which drives each of the developing rollers.
The following illustration is for bizhub C368/C308/C258.
[3]
[2]
[1]
[1] Developing roller/Y
[3] Developing drive gear/M
[5] Developing drive gear/C
[7] Developing roller/M
5.3 Operation
5.3.1 Developing unit pressure/releases mechanism
• A mechanism is provided that releases the developing unit from the PC drum to prevent the photo conductor from being damaged when the
drum unit is to be removed.
• Rotating the release lever clockwise will cause the rib fixed to the lever to fit into the groove in the developing unit, so that the developing
unit is pressed against the drum unit.
• Rotating the release lever counterclockwise will cause the rib fixed to the lever to leave the groove in the developing unit, so that the
developing unit is released from the drum unit.
[4]
[1] Photo conductor
[3] Release lever
5.3.2 Developer flow
1. Toner replenished via the toner replenishing port located at the front side of the main body is fed to the toner supply screw 1.
2. The developer is conveyed toward the rear of the unit, while being agitated and electrically charged, by the toner supply screw 1.
3. The TCR sensor is equipped on the underside of the developing unit detects toner to carrier (T/C) ratio during this time. If the T/C ratio is
lower than a predetermined value, toner is replenished.
4. The developer, fed to the rear of the developing unit, is conveyed further onto the toner supply screw 2.
5. The developer fed to the toner supply screw 2 is conveyed onto the developing roller because of the magnetic pole positioning of the
developing roller.
6. The doctor blade then controls the height of the developer brush to ensure that the developer on the developing roller levels out.
[4]
[5]
[6]
[1]
[2]
[3]
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 5.
[4] Developing roller/K
[7]
[2] Developing drive gear/Y
[4] Developing motor (M21)
[6] Developing roller/C
- -
[2]
[2] Rib
[4] Groove
O-34
DEVELOPING SECTION