Lexmark 4227 Service Manual - Page 93
Power supply removal, Print unit removal, CN4, CN7, CN8, CN9, CN10,
UPC - 734646117104
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4227-300 Power supply removal CAUTION: The power supply may be hot. 1. Turn off the printer and disconnect the power cord at both ends. 2. Remove the top cover. See "Top cover removal" on page 4-5. 3. Disconnect the power connectors from the sub logic board and main logic board. 4. Remove the five mounting screws and the ground wire screw. 5. Lift the rear edge of the supply and remove it from the printer. Power supply fan removal 1. Remove the power supply. 2. Remove the four screws holding the power supply board to the cover. 3. Pivot the board out of the cover far enough to disconnect the fan connector. 4. Remove the three screws holding the fan to the cover. Print unit removal 1. Remove the top cover. See "Top cover removal" on page 4-5. 2. Disconnect the tractor connector. 3. Disconnect the flexible signal cable and the power cable from the sub logic card. 4. Remove the ground leads from the four corners of the print unit. 5. Disconnect the following connectors from the main logic board: CN4, CN7, CN8, CN9, CN10, CN15, CN17, CN18, CN19, and CN20. 6. Remove the upper screw from the serial port card mounting bracket. Repair information 4-29