Toshiba e-STUDIO4500c Service Manual page 846

PAPER FEED
The amount of light received by the double-feed detection sensor is referred to a
lookup table that stores the values of the translucence of paper types.
Paper type check. If the amount of light measured is within the range of
translucence for the paper selected for the copy job, no action is taken. If the
value is out of range, the machine stops the job.
Double-feed check. The translucence of the paper at the registration roller is
compared to the reading of the previous sheet. If the translucence of the sheet at
the registration rollers is less than that of the previous sheet (greater opacity), the
CPU determines that a double-feed has occurred and stops the job.
In either case, after the job halts, the sheets must be cleared, just as if a jam
occurred at the registration rollers.
SP1110 001-012 enables/disables double-feed and paper type detection for the
paper feed sources (trays 1 to 3, the LCT, and bypass tray). For more, see
Section "5. Service Tables".
You can also switch these features on and with User Tool settings:
[User Tools/Counter]> System Settings> Tray Paper Setting> Next (3 times)>
Double Feed Detect/Paper Type Detect> Off (or On)> for Bypass Tray; Tray 1, 2,
3; or LCT.
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August 2006