Power Supply Removal; Power Supply Fan Removal; Print Unit Removal - Lexmark 4227 - Forms Printer B/W Dot-matrix Service Manual

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
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
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.
"Top cover removal" on page
"Top cover removal" on page
Repair information
4-5.
4-5.
4-29