3500/93 SYSTEM DISPLAY
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7.3.2.5
Display Unit LCD Module Replacement
Step1. Remove the LCD module. Use a nutdriver to remove the four 6-32 x ¼
hex nuts from the LCD mounting studs. Carefully lift up the LCD module, about
an inch or two, so that you can see the flex connector pigtail. Note how the
pigtail(s) is/are routed. Withdraw the pigtail connector from receptacle J3. If the
LCD module has a backlight then you will need to lift up the module further to
expose the backlight pigtail connector at receptacle J4. Remove the backlight
pigtail from J4. The LCD module is now free from the assembly and can be
removed.
Step 2. Install the upgrade LCD module. To install the new LCD module you will
need to reverse the procedure in Step 1. Route the LCD pigtail and the backlight
pigtail so that they do not get pinched between the LCD and components on the
main PWA.
7.3.2.6
Replace the Display Unit case.
Step 1. Replace the Display Unit case. Insert the keypad pigtail connector into
the receptacle J2. Align the screw holes in the cover with the PWA standoffs.
Check and adjust the display pigtail cable so that it is positioned in the cover
notch and does not get pinched when the cover is pressed down flush with the
back plate. Check and if necessary, adjust the LCD module backlight pigtail
cable to make sure it positioned as to not get pinched between the cover and
backplate.
Step 2. Replace the eight 6-32 x 1 ¼ Phillips head screws to secure the cover to
the back plate.
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