SCANNER UNIT
August, 2006
6-38
How is the Dust Detected?
To detect dust on the ARDF exposure glass, the ARDF transport belt turns and the
CCD scans this belt.
The ARDF transport belt has four grooves cut across it in the main scan direction.
These grooves are recessed. Because of this, they are not easily contaminated
with dust, and they are used as reference points during dust detection. Another
part of the belt could have dust on it, and give an incorrect reference.
NOTE: The illustration shows the belt if it were a perfect circle.
To detect dust, the belt turns one time. The IPU (through the CCD) checks for dust.
If a dark spot is detected for 96% of this rotation, the IPU determines that dust is
present on the ARDF exposure glass.
B132D976.WMF
34 mm
4 mm
Belt Circumference: 136 mm
Summary of Contents for e-STUDIO 4500c
Page 722: ...BOARDS August 2006 6 6 6 2 BOARDS 6 2 1 BLOCK DIAGRAM B132D981 WMF ...
Page 871: ...A3 11 x17 PAPER SIZE TRAY Machine Code B331 06 09 ...
Page 873: ......
Page 878: ...LCT LARGE CAPACITY TRAY Machine Code B473 06 09 ...
Page 880: ......
Page 896: ...PAPER END DETECTION September 2006 B473 16 06 09 ...
Page 897: ...Peripherals 2000 3000 SHEET FINISHER Machine Code B700 B701 ...
Page 901: ......
Page 972: ...COVER INTERPOSER TRAY Machine Code B704 06 09 ...
Page 988: ...3000 SHEET FINISHER Machine Code B706 06 09 ...
Page 991: ......
Page 1048: ...9 BIN MAILBOX Machine Code B762 06 09 ...
Page 1050: ......
Page 1062: ...PAPER MISFEED DETECTION TIMING September 2006 B762 12 06 09 ...
Page 1096: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 1 4 ...
Page 1097: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 2 4 ...
Page 1098: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 3 4 ...
Page 1099: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 4 4 ...
Page 1103: ......
Page 1104: ......
Page 1105: ......
Page 1106: ......
Page 1119: ......
Page 1120: ......