Lexmark 4227 Service Manual - Page 85
Lower pinch roller removal, Main logic board removal, To reinstall:
UPC - 734646117104
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Page 85 highlights
4227-300 Lower pinch roller removal 1. Remove the ribbon cover and the ribbon. 2. Remove the U-shaped ground spring (1). 3. Release the left and right pinch roller springs (2). 4. Move the carrier to the right as far as it will go. 5. Lift the left end of the lower pinch roller and move it to the left until the right end clears the carrier. Be sure not to lose the right bearing. 6. Remove the shaft to the right. Main logic board removal 1. Remove the top cover. See "Top cover removal" on page 4-5. 2. Disconnect all cables connected to the main logic board. 3. Remove the three screws at the rear edge of the board, and then remove the board. 4. Remove the EPROM from the old board and install it on the new one. To reinstall: After replacing the main logic board, recheck the "Bidirectional print adjustment" on page 4-3 and the "Printhead-to-platen gap adjustment" on page 4-2. Repair information 4-21