Intermediate Transfer Belt: How to Clean the ITB Speed Feedback Sensor
While SC499 (Intermediate transfer control error: Logging SC) is logging to SC499 SC History, ITB Speed Feedback Sensor Control is turned off if SC499 is issued three times.
Check SP2-915-001 (Encoder Sn Ctrl Condition - Scale FB Control Enable) for the ITB Speed Feedback Sensor condition. Clean the ITB Speed Feedback Sensor if the value is set to “0: disabled”.
If ITB feedback control is disabled, shifted images or small pitch banding (streaks) might occur.
When maintaining the machine, check the SP2-915-002: Encoder Sn Ctrl Condition SC499 Occurrences. If the value is not set to “0”, clean the ITB Speed Feedback Sensor.
Pull the ITB unit out to the 2nd stop position.
Raise the two levers [A] of the ITB cleaning unit.
Remove the screw and pull the ITB cleaning unit [B] out slowly unit it stops (
Press the release lever [A] and Pull the ITB cleaning unit [B] out.
Disconnect the front spring and rear spring.
Do not remove these springs. Let them hang free. They will not fall off.
Remove the screw of the belt tension roller assembly [A] (
Slowly lower the belt tension roller assembly [A], while you support the other end of the roller with your other hand [B] under the ITB unit.
Remove the tension roller assembly [C] and tension roller.
Carefully move the ITB [A] to the non-operator side until the sensor [B] is uncovered.
It is recommended to wear gloves when moving the ITB.
Do not move the belt any more after the sensor is uncovered. Doing so could damage the belt.
Clean the transfer belt speed feedback sensor [A].
Use a vacuum cleaner or an air blower to remove dust.
Wipe the sensor with a wet cotton swab. If a cotton swap is not at hand, wipe the sensor with a wet cloth. Use water if necessary, but do not use any solvent (ethanol, etc).
Do not attempt to wipe off the “black prints” on the sensors. These black prints are not dust/dirt but are components of the sensor.
