I. OUTLINE OF OPERATIONSA. OutlineThe upper roller, lower roller, and delivery roller of the fixing assembly are driven bythe main motor through clutches. (See Figure 6-101.)The upper roller has two built-in heaters: after power-on, the sub heater is turned ononly during WMUP, and the main heater is turned on and off during WMUP and duringsubsequent periods for temperature control. (See Figure 6-103.)The surface temperature of the upper roller is monitored by the main thermistor(TH1), and the DC controller PCB controls it so that it remains a specific temperature(target value).The web used to clean the upper fixing roller is of a one-way clutch type, and isoperated by the fixing cleaning belt drive solenoid (SL14).A message is indicated in service mode on the control panel when the fixing webdrive solenoid (SL14) has operated 250,000 times. The cumulative count of how manytimes the fixing web drive solenoid has operated can be checked in service mode (*6*;‘WEB’).The cleaning belt detecting lever remains in direct contact with the cleaning belt, andshifts as the cleaning belt is taken up, causing the control panel to indicate 'E005' whenit blocks the sensor (PS11).The delivery assembly is equipped with a delivery paper deflecting plate. In two-sided/overlay copying, the DC controller PCB generates the delivery flapper solenoiddrive signal to turn on the delivery flapper solenoid (SL2) so that the delivery flapperoperates to forward copy paper to the holding tray.The drive of the fixing cleaning belt drive solenoid (SL14) is used to trigger theexternal delivery sensor (PS10).CHAPTER 6 FIXING SYSTEM6-1COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
