Canon NP6621 Service Handbook

Also see for NP6621: Service manual Service manual

8–5SELF DIAGNOSISCode Cause• Data communication withcopier (faulty)• Pick-up motor (faulty)• Pick-up roller home positionsensor (faulty)• Belt motor (faulty)• Belt motor clock sensor(S11; faulty)• Feeding motor (faulty)• Slip sensor (faulty)• Delivery motor (faulty)• Delivery motor clock sensor(faulty)• Registration sensor (faulty)• Original sensor (faulty)Description• Communication breaks for 5 sec ormore. (The communication is monitoredat all times.)• The state of the sensor remains un-changed even after the pick-up motorhas been driven for 2 sec or more.• The number of belt motor clock pulses isbelow a specific value for 100 ms.• The number of slip clock pulses is belowa specific value for 100 ms.• The number of delivery motor clockpulses is below a specific value for 200ms.• The output of each sensor in the ab-sence of paper is more than a specificvalue.E400C. RDF/ADF Self DiagnosisE402E401E403E404E411Caution:1. When the self-diagnosis mechanism has turned ON, you may reset the machine by turning OFF andthen ON the copier’s power switch.2. You may make copies even while the RF remains out of order by placing originals on the copy paper.