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SCANNER CF5001 Ver.1.0 Sep. 2003
2-8
II UNIT EXPLANATION
1.2.5 APS control
The APS control is performed in the printer control board (PRCB) with signals read by the APS sensor /S
(PS3), the APS sensor /L (PS4), and the CCD sensor when the platen cover or RADF is opened/closed.
The signal is sent via the scanner drive board (SCDB) and the overall control board (OACB) (see the AFR-
20 Service manual for more detailed information on the APS control by AFR-20).
A. APS operation
The APS sensor /S (PS3) and the APS sensor /L (PS4) detect the original size in the sub-scan direction
and the CCD sensor detects the original size in the main scan direction.
B. Relationship between each of the sensors and the original size
C. APS detection timing (platen mode)
The original size in the main scan direction is detected twice. The larger size is regarded as the original
size.
Original size CCD sensor
(Length of detection: mm)
PS3
(ON/OFF)
PS4
(ON/OFF)
Smallest 102 OFF OFF
B5R 182 ON OFF
B5 257 OFF OFF
B4 257 ON ON
A4R 210 ON OFF
A4 297 OFF OFF
A3 297 ON ON
8.5 x 11R 215.9 ON OFF
8.5 x 11 279.4 OFF OFF
8.5 x 14 215.9 ON ON
11 x 17 279.4 ON ON
[1] 1st original size detection
(main scan direction, sub-scan direction)
[2] 2nd original size detection
(main scan direction)
[1] [2]
8050ma2009
APS sensor /S (PS3)
APS sensor /L (PS4)
Exposure lamp (L1)
APS timing sensor (PS2)
DF reset read switch (RS1)