Canon NP6621 Service Manual

Also see for NP6621: Service manual Service handbook

Contents

Canon NP6621 Service Manual Manual pdf 177 page image

3–121OPERATIONS AND TIMINGCOPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)VII.SELF DIAGNOSISThe microprocessor on the machine’s DC con-troller is provided with a self diagnosis mechanismwhich checks the condition of the machine (sensorsin particular) and indicates a code to identify theerror it detects.Detecting an error associated with ‘E000’ willautomatically turn OFF the power. (error auto power-off)A. Copier Self DiagnosisPossible cause• Thermistor (TH1; displacement,poor contact, short circuit)• Fixing heater (H1; open circuit,cracking)• Thermal fuse (FU1; malfunction)• DC controller (faulty)• Thermistor (TH1; short circuit)• Triac (faulty)• DC controller (faulty)• Thermistor (TH1; displacement,poor contact, open circuit)• Fixing heater (H1; open circuit,cracking)• Thermal fuse (FU1; activation)• Triac (faulty)• DC controller (faulty)• Thermistor (TH1; displacement,poor contact)• Fixing heater (H1; open circuit,cracking)• Thermal fuse (FU1; activation)• Triac (faulty)• DC controller (faulty)• Triac (faulty)• Heater ON PCB (faulty)• Main motor (M1; faulty)• DC controller (faulty)• Counter (open circuit)• DC controller (faulty)• Deck motor (M1dk; faulty)• Deck lifter clutch (CL4dk; faulty)• Lifter sensor (PS3dk; faulty)Code Description• The detection temperature of the mainthermistor (TH1) does not reach 50°C 15 secafter a press on the Copy Start key.• The detection temperature of the mainthermistor (TH1) exceeds 225°C duringcopying or stand-by.• The detection temperature of the mainthermistor (TH1) does not reach 155°C 25sec after it has reached 50°C during copying.• The detection temperature of the mainthermistor (TH1) is less than 50°C after it hasreached 155°C during copying.The activation of fixing heater (HTON=1) isdetected when the fixing heater drive signal isOFF (HTRD=0).The revolution of the main motor deviates fromthe specified value (MLOCK=0) for 1 sec ormore while the main motor drive signal remainsON (MMD=1).A check is made immediately before thecounter turns ON or OFF and when starting thecount.Normal if the drive signal is ‘0’ when thecounter turns ON. Normal if the drive signal is‘0’ when the counter is OFF.Note: The check is made only if the counter isinstalled.The lifter does not reach the lifter sensor(PS3dk) within 40 sec after the deck lifterclutch (CL4dk) has turned ON.E000E001E002E003E004E010E030E041Download service manual and resetter printer at http://printer1.blogspot.com