Ricoh Di-C1 Manual page 213

Di-C1 Training
Replacement – Image Transfer Unit (3)
Image Transfer Belt
The belt has a rim at the front and a rim at the rear. All the
rollers in the ITB unit must be between these two rims. The
rims must not be riding on the rollers.
Rim
OK
Roller
NG
Slide 213
The diagram gives you a general idea – it isn't particularly accurate.
213