3–87OPERATIONS AND TIMINGCOPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)I. Fixing/Delivery Assembly1. Controlling the Fixing Roller Tem-peratureThe upper and lower rollers of the fixing assemblyand the delivery roller of the delivery unit are drivenby the main motor (M1).The upper roller is heated by a heater (H1:900W)built in it.The DC controller monitors the surfacetemperature of the upper roller by means of twothermistor (TH1, TH2) so as to control thetemperature to a specific value.The temperature of the upper fixing roller iscontrolled as follows (paper area):160°C (at standby, during copy operation)175°C (during copy operation)To prevent drops in the temperature of the upperroller during continuous copy operation, the controltemperature is as follow, measured with main ther-mistor (TH1) Located out of paper area.Aux themistor (TH2) is at same position of mainthermistor and is checking correct function of TH1.
