Roland VersaEXPRESS RF-640 Service Notes page 214

Tighten the two screws shown in the fi gure until they slightly
8
contact with Idle Pulley Holder.
Move on to [4-9 BELT POSITION ADJUSTMENT].
Make sure not to tighten the screws too tight.
It may move the fi xed Idle Pulley Holder.
Screws
4-35
Idle Pulley Holder