Ricoh MP 7503SP Field Service Manual page 621

24. Separate the motor and base motor bracket.
Re-assembly
Follow this procedure to re-set the 2-direction drive belt.
1. Pick up the hanging belt [1] and pull it straight out.
2. Push swinging pulley [2] up.
3. Thread the black side of the upper half of the belt [3] to the raised pulley
Drum Unit
619