Oki ML420 Maintenance Manual
Also see for ML420 Series: Specification sheetUser guideUser guideInstallationInstallation
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Contents
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42113901TH01 Rev.3 95 /Oki Data CONFIDENTIAL6. TROUBLESHOOTING AND REPAIR6.1 Items to Check Before Repair(1) Check the inspection items specified in the instruction manual.(2) Find out as many details of the trouble as possible from the customer.(3) Inspect in the conditions as close as possible to those at the time the trouble occurred.(4) Proceed with the repair as follows:Check the trouble status according to Table 6.1 for the details of the trouble. Then, locatethe trouble position according to the detailed flowchart.(5) Carry out a thorough test after the repair to check for correct functioning.6.2 Troubleshooting TableTable 6.1Status Trouble Contents TroubleshootingFlowchart No. Surmise of Trouble• Power is not supplied.• No spacing operation12Power Supply Board,Control Board, Transformer Assy.Space Motor, Carriage Cable,Printhead.• Homing does not end normally. 3Space Motor, Carriage Cable,Power Supply Board,Control Board, Spacing MechanismTrouble uponpower on• Paper jam while paper insertion 4 Pressure Roller Mechanism, Pull UpRoller Cover.• Smearing/Missing dots 5 Printhead, Control Board, SpaceMotor, Carriage Cable• Faint or dark print 6 Printhead, Ribbon Feed Assembly,Control Board• Ribbon feed trouble 7 Ribbon Feed Assembly, SpaceMotor, Control Board• Line feed trouble 8 LF Motor, Platen Assy, LFMechanism, Control Board• Malfunction of switch onoperation panel 9 Operation Panel Board,Control Board• Data receiving failure 0 Control Board, (RS232C I/F Board),I/F Cable, Menu SettingTrouble duringprinting |
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