Lexmark 4227 Service Manual - Page 42
Start, FRU/Symptom, Action, Bidirectional print adjustment on Printhead-to-platen gap
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4227-300 FRU/Symptom Action 4 The previous suggestions have not corrected the problem The service check has not defined the failure, or the machine is having intermittent failures. The following may cause undefined or intermittent failures: 1. Customer's electrical voltage. Be sure that it is within the tolerance. 2. Loose connector pins or keys that fail to contact. Check the following: a. Reconnect the connectors of all FRUs and printer interface cables. b. Check the continuity of the line cord. 5 Problem occurs only in specific customer applications. 3. Electrical noise. Check the following: a. Power supply ground b. Machine frame ground c. Printer interface cable is grounded or shielded. 4. Undefined data in customer applications. Check the baud rate at the controller. Check that the printer interface cable matches the printer. Perform the Trace Print (hexadecimal printing) by the following procedure and check the data streams. 1. Press Menu. 2. Press Item ↑ to display Trace Mode. 3. Press Start. 4. Have the customer print the failing job. 5. To stop printing, turn the power switch off. If the failure still occurs, perform the "Bidirectional print adjustment" on page 4-3 and the "Printhead-to-platen gap adjustment" on page 4-2. 2-18 Service Manual