Konica Minolta SD-501 - Manual (Page 13)

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Cleaning Conveyance Belt of Saddle Stitcher Tray
The conveyance belt of saddle stitcher tray should be kept clean, otherwise soil
marks may be copied. Follow the procedure below to clean the conveyance belt.
In order to maintain optimum copy quality, we recommend to clean it every time
before using the saddle stitcher tray.
If any soil marks are found while printing, perform this cleaning procedure
immediately.
1.
Fully withdraw the Saddle stitcher tray, then open the tray stand.
Never fail to open the tray stand, otherwise the machine may be damaged.