Lexmark 4227 Service Manual - Page 51
Print quality service check, Printhead-to-platen gap, adjustment
UPC - 734646117104
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4227-300 Print quality service check FRU Action 1 Ribbon and Shield Be sure the ribbon is not worn and feeds smoothly when the knob is turned. Inspect the ribbon shield for dirt or damage. 2 Ribbon Drive Be sure the ribbon drive post rotates when printing. 3 Auto Gap Check the "Printhead-to-platen gap adjustment" on page 4-2. If Auto Gap is off, be sure the manual position setting is appropriate for the paper used. Auto Gap Motor Bracket If the failure remains, replace the Auto Gap motor bracket. 4 Printhead Cables Inspect both ends of the printhead cables for proper connection. 5 Carrier Belt Adjustment Loosen and tighten the tension pulley plate screws to make sure the carrier belt is tight. 6 Carrier Movement With the power off, manually move the carrier from side to side to inspect for drag or binds. 7 Bidirectional Print Perform the "Bidirectional print adjustment" Adjustment on page 4-3. 8 Carrier Motor The carrier motor should turn smoothly and quietly when printing. 9 Paper Feed Gears Inspect the paper feed gears for wear and tear. 10 Paper Feed Motor The paper feed motor should turn smoothly and quietly when printing. 11 Tractors Inspect the tractors for damage or looseness. 12 Feed Roller Surfaces Inspect the feed roller surfaces for dirt or wear. Diagnostic information 2-27