MX-2640N, MX-2640NR, MX-2640FN, MX-3140N, MX-3140NR, MX-3140FN, MX-3640N, MX-3640NR, MX-3640FN (serv.man177). COUNTERMEASURE FOR NOISE FROM MAIN DRIVE UNIT - Sharp Copying Equipment Technical Bulletin (repair manual). Page 4

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Work procedure:
1. Remove DV drive belt BK and Pulley 22P(x2).
 *Be careful not to drop the parallel pins.
 *Check the number of Poly slider (2pcs).
2. Replace Pulley 22P (x2) with non-defective ones, and then mount them with DV drive belt BK.
 *Make sure that the parallel pins are inserted into the axises.
Be careful 
not to drop the parallel pins.
NOTE:
There are two Poly sliders.
Remove DV drive belt BK and Pulley 22P(x2) 
and then replace Pulley 22P (x2) 
with non-defective ones.
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