COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)2. Fixing Heater Safety Circuit (on the power supply circuit; E808)The fixing heater safety circuit is found in the power supply assembly, and serves tocheck the upper and lower fixing heaters for a fault.a. When the fixing heater safety circuit finds a fault in the upper fixing heater,If the fixing temperature increases abnormally, the power from the power supplyassembly to the upper/lower heater will be cut off.Figure 6-202CHAPTER 6 FIXING SYSTEM6-6Power supplyDC control PCBFixing assemblyFXSTSFXENBFXRONFXUONFXLONACTYPUpper fixingrollerLowerfixing rollerFixing heaterdrive circuit+24V C2RL101Fixing heatersafety circuit12 1021456IC203ExpansionI/OIC202IC201M-CPUD-CPUBUSFXUONSFXLONS603031 30212223242097961819+5V+5VQ204Q20Q237T101FXTHUFXRONFXTHLFXTYPFXSELJP2IC101+5V Q203JP1+5V+5VTHLLowerthermistorTHUUpper thermistor Q10113+5V11108Q11215Q111+5V+5VIC102 IC1029 141110139814Fixing assemblyerror detectioncircuitUpperthermalswitchLowerthermalswitchDownload free service manual at http://printer1.blogspot.com
