
PROM Installation Guide
ECC NO. 468 Page 373J019 REV. B
Procedure Continued
5. Locate U4, the M3 PROM. Remove and replace the PROM. Be careful to correctly align Pin
1 and properly seat the PROM, see Figure 3.
Warning
Use an IC inserter to remove and replace the PROM. If one is not available, use a small slotted
screwdriver. Insert the screwdriver under the PROM, twist slightly and gently lift up. Inserting the
screwdriver incorrectly could damage surrounding components.
Figure 3. M3 PROM Location
6. Replace the ACG card if applicable. Connect the end of the ribbon cable into J3, the Option
Cards Expansion Connector, on the main board. On the M3 Option Card, insert the
connector closest to the ACG card into J1, the Option Cards Expansion Connector. Make
sure the cable is lying flat across the slots in the brackets.
7. Tilt and slide the card into the groove along the top of the left side rail. Position the
connectors into the appropriate cutouts in the back panel. Insert the two phillips screws
through the ACG Card into the bracket standoffs and tighten.
8. Replace the cover on the System Unit. Insert and tighten the six phillips screws. Reconnect
the cables and turn on the power. The System Unit will automatically detect the new
software version. To verify that the upgraded software is operating, press SYS on the
Keyboard Unit, the new software version numbers will be displayed.