3500/93 SYSTEM DISPLAY
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Step 2. If you are replacing the LCD module only, and not upgrading the
firmware then skip section 7.3.2.3 and 7.3.2.4 and proceed to section 7.3.2.5.
Carefully lift up the right (keypad side) of the display approximately 4 inches.
Note that the keypad is connected to the main PWA by a flexible “pigtail” flat flex
wire harness. Using your right index finger and thumb push the pigtail connector
to the left completely out of the mating receptacle (J2). The display cover can
now be completely separated from the back plate.
7.3.2.3
Remove the original EPROMs from the DU PWA.
Step 1. Locate the EPROMs in the area shown on the DU PWA. Insert the small
flathead screwdriver under the lip of either end of the chip. Slightly lift the one
end of the chip by gently prying with the screwdriver. Move to the other end of
the chip and repeat. Continue this process until the chip comes loose from the
socket. Repeat for the remaining original EPROM.
Summary of Contents for 3500/93
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