Lexmark Forms Printer 2400 Service Manual - Page 38
Perform the Hex Trace Print hexadecimal, Tractor, FRU/Symptom, Action
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24xx FRU/Symptom Action 4 If the prior suggestions have not corrected the problem. 5 Problem occurs only in specific user applications. The following may cause undefined or intermittent failures: 1.Loose connector pins that fail to contact. Check the following: • Reconnect the connectors of all FRUs and printer interface cables. • Check the continuity of the line cord. 2.Electrical noise. Check the following: • Power supply ground. • Printer frame ground. • Printer interface cable is grounded or shielded. 3.Undefined data in user applications. Check the baud rate at the controller. Check that the printer interface cable matches the printer. Perform the Hex Trace Print (hexadecimal printing) by the following procedure and check the data streams. Go to "Hex Trace Mode" on page 3-4. 1. Turn the printer off. 2. Press and hold Tractor and turn the printer on. 3. Have the user print the failing job. 4. To stop printing, turn the power off. If the failure still occurs, replace the logic board. Be sure to reset the bidirectional print adjustment. See "Bidirectional Print Adjustment" on page 4-4. 2-20 Service Manual