Oki ML421 Maintenance Manual - Page 130
Before Repairing a Fault, Troubleshooting
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Oki Data CONFIDENTIAL 3. TROUBLESHOOTING FLOWCHART 3.1 Before Repairing a Fault Before servicing the printer, ask the customer in what situation the trouble occurred and record the response. Before starting troubleshooting, operate the printer in the same situation as that at the time of trouble occurrence to see if the same trouble occurs again. If not, perform the printers self test and thoroughly test the printers functionality. If the trouble is reproducible proceed to the troubleshooting 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? 90ns + 4 to + 5V V T (ns) 0 to + 1V Figure C-4 No Replace the OSC. Yes Is a RST signal in Q3 is as specified in Figure C-5? 5V 0V Figure C-5 No Check the RST circuit on the Control Board. A 42113901 Rev.2 130 /