Canon FAX-L350 Service Manual

Also see for FAX-L350: Simplified guide Service manual

Contents

Canon FAX-L350 Service Manual Manual pdf 130 page image

3-19FAX-L350 Chapter 3: Maintenance and Service4.3.2 Printing problems• Faulty printing (Evaluation criteria: Test print is faulty.)• The paper is not fed correctly. (Evaluation criteria: Look at the actual unit.)The main motor does not run.(1) Check the voltage (+12 V) at both terminals of C501 located on the MCNT board.(2) Check the main motor's resistance. 1.62 ~ 1.98 W/1 phase is normal. (Fig. 3-4)(3) Replace the main motor.(4) Replace the SCNT board.(5) Replace the MCNT board.Figure 3-4 Main Motor ConnectorThe paper is not picked up from the auto sheet feeder/cassette.(1) Check whether the recommended paper is used.(2) Check whether more than 100 sheets (0.39" (10 mm)) or less of paper have been loaded in the autosheet feeder, be sure that the curling, if any, appreciable.(3) Check whether more than 250 sheets (1.08" (27.5 mm)) or less of paper have been loaded in thecassette.(4) Check whether the paper has been loaded into the sheet feeder correctly.(5) Check the connection between the paper pickup solenoid and the MCNT board (J501/J508).(6) Replace the paper pickup solenoid.(7) Clean the separation pad.(8) Replace the separation pad.(9) Replace the separation pad spring or the lifting spring.(10 )Replace the SCNT board.The paper skews.(1) Check whether the recommended paper is used.(2) Check whether more than 100 sheets (0.39" (10 mm)) or less of paper have been loaded in the autosheet feeder, be sure that the curling, if any, appreciable.(3) Check whether more than 250 sheets (1.08" (27.5 mm)) or less of paper have been loaded in thecassette.(4) Check whether the paper has been loaded into the sheet feeder correctly.(5) Check whether dust or paper debris have built up inside the auto sheet feeder.(6) Check whether the paper pickup roller, or any other rollers, are damaged or scratched.• The printing operation is abnormal.The unit indicates there is a paper jam when there is no paper jam.(1) Check the connection from the paper edge sensor to the SCNT board (J507).(2) Check whether the paper edge sensor and actuator and the paper eject sensor actuator are in theircorrect positions.(3) In test mode check whether the paper edge sensor and the paper eject sensor are operating correctly.(4) Check the connection between the main motor and the SCNT board (J507).(5) Replace the main motor.(6) Replace the SCNT board.14Main motor connector1-2 : 1.62~1.983-4 : 1.62~1.98ΩΩMain motor