Canon PC940 Service Manual - Page 43

CHAPTER 2 BASIC OPERATION E. Inputs to and Outputs from the DC Controller 1. Inputs to the DC Control (1/2) Scanner home position sensor Lens home position sensor +5V J101-1 -3 SCHP PS1 -2 +5V J109-11 -10 LHP PS2 -9 DC controller PCB When the scanner is in the home position, '1'. (The light-blocking plate is at PS1, '1'.) When the lens is in the home position, '1'. (The light-blocking plate is at PS2, '1'.) Delivery sensor Vertical path roller paper sensor J62 J102-7 DIG3 PS3 -9 -8 DPD +5V J132-3 PS4 -5 -4 PDP When PS3 has detected paper, '0'. (The light-blocking plate is at PS3, '1'.) When PS4 has detected paper, '1'. (The light-blocking plate is at PS4, '1'.) Single-feeder paper sensor PS5 (Single-feeder type only) Pre-registration roller paper sensor Q751 Sensor PCB J113-1 -3 -2 DIG2 SFPD +5V J108-4 -3 -5 RPD Fixing thermistor TH1 J433 J62 J102-1 TH1 -6 TH2 Scanner thermistor J131-1 TH2 -2 When PS5 has detected paper, '0'. (The light-blocking plate is at PS5, '1'.) When Q751 has detected paper, '1'. (The light-blocking plate is at PS751, '0'.) When the surface temperature of the fixing heater increases, the voltage decreases. (analog signal) When the temperature of the scanner increases, the voltage decreases. (analog signal) Figure 2-105 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-7