Canon PC720 Service Manual - Page 111
VIII., DIAGNOSIS, crins
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OPERATIONS AND TIMINGIMII VIII. SELF DIAGNOSIS The copier's DC controller PCB is equipped with a microprocessor that checks the state of the machine (sensors in particular); when it identifies an error, it indicates it in the copy counter on the control panel. In the case of `E001', `E0' and '01' are flashed alternately. Code E Cause Indicated when the fixing film is being corrected for displacement. H Fixing heater (overheating) EC Problems associated with `E000', `E001', 'E002', or 'E003' has occurred. crins, • Thermistor (TH1, TH2; faulty) U.LILOLI • Fixing heater (H1; faulty) • Thermal fuse (FU1; melted) • Triac (faulty) • DC controller PCB (faulty) Description • The fixing film displacement sensor (PS4) detects the fixing film at power-on and, in addition, the thermistor (TH1) temperature is less than 100°C. • The thermistor (TH2) temperature exceeds 225°C during copying operation. • The power switch has been turned off and on immediately after an error (E000, E001, E002, E003). • The thermistor (TH1) temperature fails to reach 65°C 1.5 sec after a press on the Copy Start key. • The thermistor (TH1) temperature fails to reach 150°C in 4 sec after a press on the Copy Start key. • The thermistor (TH2) temperature fails to reach 65°C in 4 sec after a press on the Copy Start key. COPYRIGHT © 1994 CANON INC. CANON PC720/7401750I770 REVD AUG.1994 PRINTED IN JAPAN (imPRimt AU JAPON) 3 - 71