you should also have a look at the retaining ring on the driving roller near the drive coupling. if it becomes loose, you can get a 2220 and also 4520, 4521, 4522.
in addition, i post here a chapter from the troubleshooting guide, it refers more to drum drive errors, as 2214 per example, but maybe you should give it a try:
[Symptom] C-22xx Drum drive error occurs
[Probable causes and solutions]
1) Difference of line speed between intermediate transfer belt and drum is too large. As the result, the torque becomes lighter. To correct it, perform following
a) Check the value of belt line speed Service mode => [01 Machine Adjustment] => [01Printer Adjustment] =>[08 Belt Line Speed Adj.]: Check the value of belt line speed. It should be within -5 to -35. If the adjustment result does not correspond to the adjustment value stated in the Service Manual with the setting -5 to -35, Please also perform FD-Mag. Adjustment. Service mode => [01 Machine Adjustment] => [01Printer Adjustment] =>[03 FD-Mag. Adjustment]
* Please refer to Service manual [10.3.3 FD-Mag. Adjustment] and [10.3.8 Belt Line Speed Adjustment] for details. The adjustment range is +/- 0.1.
b) Even belt line speed is re-adjusted, drum drive error recurs or if the setting value is within -5 to -35, perform fine adjustment of the drum line speed.
Service mode => [03 System Setting] => [01 Software SW Setting]
DipSW21-6, 7
Bit6 Bit7
0 0

efault
1 0 :0.1% up
0 1 :0.2% up (recommended setting)
1 1 :0.3% up
good luck
