Maintenance and Repair
6. Remove the four nylon nuts holding the LCD display assembly in place, located near
the four corners of the board, using a 5/16″ socket.
CAUTION
Take care not to damage the front-panel overlay or
the display when separating them.
7. Remove the display assembly by carefully pulling it away from the front-panel
overlay.
26 Front-panel Display Installation
1. If the left side panel and front-panel bars are installed, remove them using
Procedure 13.
2. Orient the LCD display assembly so that the header for the display connector is
toward the keypad assembly.
3. Install the LCD display assembly over the studs protruding from the rear of the front
panel. Nylon nuts should already be in place on each of the front-panel studs.
4. Check that the LCD display is flush with the front-panel overlay. While holding the
display against the four nylon nuts, note whether the overlay bulges out or can be
pressed in by lightly touching it next to the display. If either of these is seen, it is not
flush with the front surface of the panel and adjustment is necessary.
5. If adjustment is needed, use a 5/16″ jam-nut wrench to turn the nylon nuts supporting
the LCD display. Make adjustments until the display is just flush with the rear of the
overlay. When finished, all four nylon nuts must touch the display printed circuit
board when it is lightly pressed against the nuts.
6. Install the four additional nylon nuts to hold the LCD display in place. Tighten to
5 in-lb torque.
7. Solder the black and red twisted wires to keypad board. Solder the red wire to the pad
marked A and the black wire to the pad marked K.
8. Install the top cover support bracket using a 5/16″ socket. Tighten to 7 in-lb torque.
9. Install the display connector to the rear of the LCD display assembly. See
Figure 9-12.
10. Follow Procedure 14 for Left Side Panel and Front-panel Bar Installation.
11. Follow Procedure 2 for Top Cover Installation.
9-18
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