Maintenance and Repair
4. Remove the keypad connector from the rear of the keypad assembly. See
Figure 9-5.
5. Remove the encoder connector from the rear of the keypad assembly. See
Figure 9-5.
6. Unsolder the black and red twisted wires (marked A and K) from the keypad board.
7. Remove the six mounting nuts and lock washers retaining the keypad board using a
3/16″ socket.
8. Remove the keypad assembly and elastomeric KEYPAD.
16 Keypad Installation
1. Install the elastomeric KEYPAD from the rear of the front panel. Line up the holes
with the small studs.
2. Install the keypad printed circuit board on top of the KEYPAD. Line up the holes in the
printed circuit board with the small studs. See Figure 9-5.
3. Install the six keypad board mounting nuts and lock washers using a 3/16″ socket.
Tighten to 2.0 in-lb torque.
4. Solder the black and red twisted wires from the display assembly onto the keypad
printed circuit board. Solder the red wire to the pad marked A, and the black wire to
the pad marked K.
5. Install the encoder connector and the keypad connector to the rear of the keypad
assembly. Ensure proper polarity, with Pin 1 (the edge of the cable with a brown wire)
of each cable toward the left side of the unit. See Figure 9-5.
6. Install the display connector to the rear of the LCD display assembly. Ensure proper
polarity, with Pin 1 (the edge of the cable with a brown wire) of the cable toward the
top of the unit.
7. Follow Procedure 14 for Left Side Panel and Front-panel Bar Installation.
8. Follow Procedure 2 for Top Cover Installation.
17 Analog Assembly Removal
1. Follow Procedure 1 for Top Cover Removal.
2. Follow Procedure 13 for Left Side Panel and Front-panel Bar Removal.
3. Unplug the two interconnect ribbon cables from the analog assembly. See Figure 9-7.
4. Remove the temperature sensor wires from the plus and minus binding posts by
grasping the heat-shrink tubing of the temperature sensor wires and gently pulling
straight back to remove the sensor from each binding post. See Figure 9-8.
Note: The RTV adhesive holding the temperature sensors in the binding posts will
break as each sensor is removed.
5. Remove the four analog assembly mounting screws and lock washers, located near
the four corners of the board, using a #2 Phillips screwdriver. This allows the analog
assembly to slide back for better access to the binding post printed circuit board.
9-10
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