Oki ML421 Maintenance Manual
Also see for ML420 Series: Specification sheetUser guideUser guideInstallationInstallation
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Contents
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42113901 Rev.2 133 / 133Oki Data CONFIDENTIALEquivalent to Cannon DB-25PTDRDRTSCTSCDSSDDTRDSR23458112063.3 Local Test3.3.1 Circuit test mode3.3.1.1 Setting(1) Diagnostic test (set by menu)(2) Test connectorConnect the test connector shown in Figure C-9 to the interface connectorFigure C-9 Test Connector Connection Diagram3.3.1.2 FunctionAfter the settings outlined in Section 3.3.1.1 are completed and power is turned on, the serialinterface checks the message buffer memory and interface driver/receiver circuit. It then printscharacters.To start and stop this test, push the SEL switch on the front of the printer.Details of this test are explained on below.(1) The program revision using two numerical characters is printed.(2) “LOOP TEST” is printed.(3) Memory is checked for the message buffer.(4) Prints “OK” is printed if the memory check is OK and “BAD” is printed if the memory checkfails.(5) Output level to DTR, RTS, and SSD signals is dropped low. If DSR, CTS, or CD signalsis High, “IF BAD” is printed. If DSR, CTS, and CD signals are all Low, “IF OK” is printed.(6) Output level to DTR, RTS, and SSD signals is raised high. If DSR, CTS, or CD signalsis Low, “IF BAD” is printed. If DSR, CTS, and CD signals are all High, “IF OK” is printed.(7) Transmits characters codes from 20H to 7FH is transmitted by SD signal. At the sametime, characters are received by the RD signal and stored in the message buffer.(8) The characters that were stored in the message buffer as indicated in (7) are printed.(9) Steps (1) through (8) are repeated until test is interrrupted. |
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