Canon PC981 Service Manual - Page 213
Original Lengths and Operation Sequences, Identifying the Length of the Original,
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CHAPTER 8 ADF 2. Identifying the Length of the Original The registration paper sensor (PI2) is used to identify the length of the original, if any. The ADF controller computes the length of the original based on the time it takes for the original to move past the registration paper sensor (PI2). Using the result of the computation, the ADF controller determines whether the size of the original is A4/LTR or smaller or LGL, thereby switching to the appropriate ADF operation. Table 8-101 shows the lengths of originals that determines ADF operation sequence. Original Original tray PI2 PI3 Registration paper detection signal (PDP2) ADF controller PCB Figure 8-107 Original Lengths and Operation Sequences Length ~313cm 314cm~ Sequence For A4/LTR originals For LGL originals Table 8-101 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-7
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