Lexmark 4227 Service Manual - Page 61
Interface selection, Operation with the top cover removed, Service Menu
UPC - 734646117104
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4227-300 Interface selection Serial or parallel attachment can be selected from the User Menu under Interface Options. If serial attachment is selected, RS-232 or RS-422 can be selected with the switch that is accessible through the rear cover. Serial attachment parameters are set in the Interface Options menu. Operation with the top cover removed After you remove the top cover, the printer can be operated for service purposes by positioning the cover near the main logic board and reconnecting the operator panel cable. The ribbon cover must be in place on the top cover. Or, you can remove the operator panel and cable, jumper the two pins of the ribbon cover sensor connector CN1 together on the back of the panel, and reconnect the operator panel flex cable to the main logic board. Note: Printing without the top cover affects print quality and may cause paper jams, since the upper feed rollers on the ribbon cover do not help restrain and feed paper. Service Menu Enter the Service Menu by pressing Menu/Quit during POR. Release the button when the carrier strikes the left side frame. Exit the Service Menu by pressing Menu/Quit. • Sensor Test 1: Tests PSet, Jam, PE & TOF sensors. • Sensor Test 2: Tests Paper Select, Gap Home, and Cover sensors. These tests display an underline (_) if the sensor is open or a block (■) if the sensor is blocked. Use paper, tools, or fingers to block and unblock the sensors to verify that each is functional. Return to the Service Menu by pressing Menu/Quit. Diagnostic aids 3-3