Oki ML420 Maintenance Manual
Also see for ML420 Series: Specification sheetUser guideUser guideInstallationInstallation
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Contents
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42113901TH01 Rev.3 130 /Oki Data CONFIDENTIALNo Check the RST circuit on the Control Board.A3. TROUBLESHOOTING FLOWCHART3.1 Before Repairing a FaultBefore servicing the printer, ask the customer in what situation the trouble occurred and recordthe response.Before starting troubleshooting, operate the printer in the same situation as that at the time oftrouble occurrence to see if the same trouble occurs again. If not, perform the printers self testand thoroughly test the printers functionality. If the trouble is reproducible proceed to thetroubleshooting section.3.2 Troubleshooting(1) The data is not received using a serial interface.(2) Using a serial interface, the print data is omitted or the print operation is not performed.1 The data is not received using a serial interface.(A protocol is set to READY/BUSY state, and BUSY LINE is in SSD + state.)Is the OSC oscillation waveform as specified in Figure C-4?No Replace the OSC.Yes Is a RST signal in Q3 is as specified in Figure C-5?Figure C-4Figure C-5VT (ns)+ 4 to + 5V0 to + 1V90ns5V0V |
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