Appendix B. Disassembly Instructions
Caution: These servicing instructions are for use by qualified personnel only. To
avoid electric shock do not perform any servicing other than that contained in the
operating instructions portion of this manual unless you are qualified to do so.
Refer all servicing to qualified service personnel.
Warning: Lethal voltages are present inside the chassis. Perform all service
work with the unit disconnected from all AC power.
Tools Required
1. #2 Phillips screwdriver.
2. 5/64" allen wrench.
Top Cover Removal
1. Ensure that the 425 is disconnected from the AC power source.
2. Remove four 6-32 x 1/2 inch screws from the rear-panel.
3. Remove two 6-32 x 1/2 inch screws from each side of the chassis.
4. Remove one 6-32 x 1/2 inch screw from the top-middle of the front panel. Use caution to
prevent the screwdriver from slipping and marring the front panel.
5. Lift the top cover free of the chassis.
Circuit Board Removal
1. Ensure that the 425 is disconnected from the AC power source.
2. Remove the top cover using the procedure described previously.
3. Remove the four screws from the four corners of the front panel and one screw in the
bottom-center of the front panel.
4. Locate the LED board near the front panel.
5. Remove the LED board by removing the two screws located at the ends of the board,
then applying upward pressure at the connector located at the middle-rear of the board
to disengage the board.
6. Remove four 6-32 x 1/4 inch SEMS machine screws from the printed circuit board.
Three are located near the front panel, the remaining screw is located near J13.
7. Remove the two 6-32 x 1/2 inch machine screws that fasten the IEC power connector to
the chassis.
8. Remove four 6-32 x 1/2 inch screws from the ends of the front panel (two on left, two on
right).
9. Disconnect the green safety ground wire at the chassis screw terminal by removing the
nut. Ensure that this wire is reconnected when reassembling the 425.
10. Lift the circuit board, with the front panel attached clear of the chassis.
B-1
Rev 2.0, 10/29/93
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