Canon PC921 Service Manual - Page 209
Inputs to and Outputs from the ADF Controller PCB,
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CHAPTER 8 ADF 2. Inputs to and Outputs from the ADF Controller PCB a. Inputs to and Outputs from the ADF Controller PCB (1/1) ADF switch MS1 Delivery sensor PI1 +24V J6-1 ADF controller PCB -2 ADFC When ADF is opened, '1'. +5V J5-1 -3 PDP1 When original is detected, '1'. -2 (when light-blocking plate is at sensor) Registration paper sensor PI2 Original placement sensor PI3 Belt motor M1 Pickup motor M2 +5V J105 J5-4 -6 PDP2 When original is detected, '0'. -5 (when light-blocking plate is at sensor) +5V J5-7 -9 PDP3 When original is detected, '0'. -8 (when light-blocking plate is at sensor) J3-1 -2 -3 -4 See p. 8-15. -5 J3-6 -7 See p. 8-14. J114 J202 J2 Serial communication Copier *Negative logic. Figure 8-103 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-3