GBC AdvancedPunch Pro Service Manual page 217

ADJ 1.4.3 M1, M6, M7 Stepper belt adjustment (134T belt)
Use this procedure to adjust the Belt tension of 134T timing belt.
1. Disconnect the Power Cord.
2. Do REP 1.6 to remove the Rear Cover.
3. Loosen the the tensioner.
4. Adjust the belt tension such that there is a deflection of 3~5mm.
GBC AdvancedPunch Pro
5. Tighten the tensioner
6. Do REP 1.6 to install the Rear Cover.
7. Connect the Power cord.
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Repairs/Adjustments