Lexmark 4049LMO Service Manual - Page 49

4049-XXX If the displayed error is 977, verify that the network card is installed and grounded correctly. Remove the network card and check for +5 VDC at pin B24 of RIP board J6 or J12 (whichever the network card was connected to). If the voltage is incorrect replace the engine board; if there is +5 VDC replace the network card. Network Wrap Tests Token-Ring with Shielded Twisted-Pair Cable: Disconnect the LAN cable from the electrical outlet, leaving it connected to the printer network card. Ethernet 10BASE2: Attach a 50 Ohm BNC terminator cap to each end of the T-connector. The customer may be able to provide this cap. There is no wrap test for Token-Ring with Unshielded Twisted-Pair cable or for Ethernet 10Base -T. POR the printer. If the printer completes POR successfully, the printer, network card, and the port to the LAN are working correctly. If the customer still has a problem printing, see "LAN Problems" on page 2-21. Output Bin Sensor Examine the bin area for obstructions or damage. Run the diagnostic sensor test. Make sure the plastic bails and guide are in good condition and that they guide the sensor flag out of and into the sensor as paper passes into the bin. On the sensor, the voltage from pin 2 to pin 3 (pin 1 is the bottom pin) should change from 0 to +5 VDC as the sensor is blocked and unblocked. Pin 1 should always measure +5 VDC. Replace the sensor, the sensor card or the operator panel/bin sensor cable as necessary. Operator Panel Problem Note: If the printer is in "Menus Disabled" mode, you can activate the menus by powering on the printer with the Return button and the top button pressed. Repeat the POR procedure to disable the menus again after service. Diagnostic Information 2-22