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3-48 Installation and Service Guide
Key Lock
Removal
1. Set the power switches of the attached devices to Off.
2. Set the power switch of the system unit to Off.
3. Refer to the illustration of the key lock on page 3-49.
4. If the system unit has a rear cover, do the rear cover removal procedure on page 3-3.
5. Do the top cover removal procedure on page 3-4.
6. Do the front cover removal procedure on page 3-6.
7. Set the key mode switch to the Normal position.
8. Push the ring toward the front of the machine until it uncovers the retaining latches of the
key mode switch.
9. Pull the key mode switch off.
10.Note the position of the retainer and pull the cover lock (cam) straight up. (It may be
necessary to use pliers.)
11. Remove the nut, lock washer, and the key lock.
12. On early system units, remove the ESD ground spring from the key lock.
Note: Ensure that the key in the new key mode switch has been turned fully
counterclockwise and that the retainer is back in its original position.