Lexmark 4227 Service Manual - Page 54
Ribbon drive service check, Service Manual, In normal operation
UPC - 734646117104
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4227-300 FRU/Symptom Action 8 Main Logic Board If no other problem is found, replace the main logic board, retaining the old board for reinstallation if the problem is not fixed. Perform the "Bidirectional print adjustment" on page 4-3 and the "Printhead-to-platen gap adjustment" on page 4-2. Ribbon drive service check In normal operation, the ribbon knob rotates counterclockwise whenever the carrier moves to the left. FRU/Symptom 1 Ribbon Drive Gear Train 2 Ribbon Motor Action Remove and inspect the ribbon. Make sure the knob turns with even, moderate force and the ribbon feeds correctly. Inspect the gear train from the ribbon motor to the ribbon drive post. Check the "Printhead-to-platen gap adjustment" on page 4-2. If printing seems normal, but the ribbon is not moving, remove the ribbon and turn power on. The ribbon drive post should turn several times during POST. Disconnect the ribbon motor connector CN19 from the main logic board. The winding resistance should be 118 ohms ± 5 between pins: 1 and 5, 3 and 5, 2 and 6, 4 and 6. Pin 5 should show an open circuit to pins 2, 4 and 6. Pin 6 should show an open circuit to pins 1, 3, and 5. 2-30 Service Manual