I. OPERATIONA. OutlineThe upper roller, lower roller, and delivery roller 1 are driven by the main motor (M1),and the delivery roller 2 is driven by the delivery motor (M6).The copier’s upper roller is heated by two fixing heaters (H1 : 750 W (220 / 240 V) /700 W (120 V) ; H2 : 640 W (220 / 240 V) / 600 W (120 V)), and its surface temperatureis monitored by a thermistor (TH1).The DC controller turns on and off the fixing heater drive command (MHRD, SHRD)based on the fixing temperature signal (TH1, analog) from the thermistor.The control temperature and the area of heating during copying are varied accordingto the following:• Copy paper size (width)• Number of copies (continuous copying)Figure 6-101CHAPTER 6 FIXING SYSTEMCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-1SSRThermistor (TH1)Thermoswitch(TSW)H1H2Cleaning beltFixingrollerCleaning beltguide plateDeliveryroller 1Deliveryroller 2One-wayclutchCleaning belt solenoidcleaning belt solenoid drive command (CBSD *)fixing thermistor signal (TH1)+24VB power switch off command (PWOFF*)AC power main heater drivecommand (MHRD)sub heater drivecommand (SHRD)main SSR drivesignal (MSSRD)sub SSR drivesignal (SSSRD)DCcontrollerPCBSL4
