COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 10 TROUBLESHOOTING10-31CauseUpper thermis-tor (short cir-cuit)Lower thermis-tor (short cir-cuit)Power supply(printer unit)Step123Yes/NoYESYESYESNOActionCheck the wiring fromthe connector J222 onthe DC controller PCBto the upper thermistor;if normal, replace theupper thermistor.Check the wiring fromthe connector J222 onthe DC controller PCBto the lower thermistor;if normal, replace thelower thermistor.End.Replace the DC con-troller PCB.ChecksWith the fixing assembly removed,measure the resistance between theconnectors J26F-A4 (FXTHU) andJ26F-A3 (GND) on the fixing assem-bly side. Is it 2 K or less?Measure the resistance between theconnectors J26F-A2 (FXTHL) andJ26F-A1 (GND) on the fixing assem-bly side. Is it 2 K or less?Replace the power supply unit of theprinter unit. Is the problemcorrected?2 E001CauseUpper fixingheater/Upperthermal switch(open circuit)Lower fixingheater, Lowerthermal switch(open circuit)ConnectorsPower supply(printer unit)Step1234Yes/NoNONONOYESNOActionCheck the upper fixingheater and the upperthermal switch.Replace the problemparts.Check the lower fixingheater and the lowerthermal switch.Replace the problemparts.Connect the connec-tors securely.End.Replace the DC con-troller PCB.ChecksWith the fixing assembly removed, isthere electrical continuity betweenthe connectors J27F-3 (HTUH) andJ27F-4 (HTUC) on the fixing assem-bly side?Is there electrical continuity betweenthe connectors J26F-3 (HTLH) andJ26F-4 (HTLC) on the fixing assem-bly side?Are the connector J222 on the DCcontroller PCB, connector J26 of thefixing assembly, and connector J101of the printer unit power supply con-nected securely?Replace the power supply of theprinter unit. Is the problemcorrected?3 E004If E001 or E003 is indicated, be sure to discharge the error memory capacitor (C259)on the DC controller PCB after troubleshooting the problem, as it may contain errormemory. (Short JP201 on the DC controller PCB to discharge C259.)Caution:Download free service manual at http://printer1.blogspot.com
