Stylus Pro 4880 Field Repair Guide 1/17/08
Paper Feed Timing Belt Adjustment Printer Component, Software Item, LCD Display, Printer Button  Page 158.
apply tension to the Belt.
4. Tighten the Screw, then check the Belt tension with your finger. There should be a deflection of 
approximately 1/8” to 1/16”.
5. If the Belt has too much deflection, loosen the Screw, and add some finger pressure to the Spring 
to increase the tension, and repeat step 4.
Loosen this screw.
This spring will apply 
tension to the belt.
Press here.
Look for 1/8’ to 1/16” deflection