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C1543M-A (7/04) 3
CIRCUIT
BOARD
U4
U12
U5
U2
NOTCHED END
OF EPROM
ALIGNMENT
NOTCH
U3
U3 EPROM CHIP
6. Remove the existing U3 EPROM chip (refer to Figure 2) from its socket using the provided extraction tool. Remove the chip
slowly to avoid damaging the socket.
7. Remove the replacement EPROM chip from the electrostatic bag, and inspect the chip to confirm that the pins are
straight.
8. As illustrated in Figure 2, orient the chip using the alignment notch as a guide. Verify pin-to-socket alignment, and then
carefully press the chip into its socket until the chip is completely seated.
9. Reattach the bottom cover to the KBD using the nine Phillips screws.
10. Reset the keyboard to factory default settings by doing the following:
a. With the KBD remaining powered off, set DIP switches 1, 2, and 8 to the ON position.
b. Power on the KBD by reconnecting the cable to the COM 1 port.
The Diagnostics mode display appears.
c. Power off the KBD by disconnecting the cable from the COM 1 port.
d. Set DIP switches 1 and 8 to the OFF position.
e. Power on the KBD by reconnecting the cable to the COM 1 port.
Figure 2. U3 EPROM Chip