User's Manual

5.3.9 CONTROL UNIT REMOVAL

1. Remove two oval screws (7) from each side of control unit (8).

2. Separate control unit (8) from main chassis (29).

3. Disconnect red keypad cable assembly (57) from CN3P plug on control unit (14).

4. Disconnect blue microphone cable assembly (56) from CN4P plug on control unit (14).

5.3.10 CONTROL UNIT CIRCUIT BOARD REPLACEMENT

I. Remove control unit (8).

2. Disconnect volume cable assembly (16) from CN4O2P plug on control unit (14).

3. Disconnect speaker cable assembly (23) from CN4OIP plug on control unit (14).

4. Disconnect keypad (1) from CN12P socket on control unit (14).

5. Remove five bind screws (15) from control unit (14).

6. Remove board (14).

7. Install new control board and reverse the steps above to reassemble.

5.3.11 LCD AND BACKLIGHT REPLACEMENT

1. Remove control unit (14).

2. Straighten four metal tabs on the LCD cover (10) which are twisted on the opposite side of the

control unit (14).

3. Remove LCD cover (10).

4. Remove LCD conductive pad (12).

5. Remove LCD display (11).

6. Desolder four tabs on the control unit (14) and remove LCD backlight (13).

7. The LCD display (11) makes contact by mechanical pressure against contacts on the control unit

circuit board (14) and LCD conductive pad (12). Clean all contact surfaces with rubbing alcohol.

8. Install new backlight and solder into place. (This part is symmetrical so it cannot be inserted wrong)

9. Install new LCD display and conductive pad, press firmly against the control unit (14) and twist the

tabs on the LCD cover (10) 1/4 turn. (Arrows on the control module show which way the tabs should

be turned).

5.3.12 KEYPAD REPLACEMENT

1. Remove control unit (14).

2. Use a heat gun or hair dryer to warm the casting behind the keypad. Do not overheat.

3. Using a blunt tool, apply steady pressure to the rear of the keypad (1) through the cable slot and

separate the keypad (1) from the control panel (8).

4. Clean the surface of control panel (8) with rubbing alcohol.

5. Remove paper cover on the tape on the back of new keypad.

6. Install new keypad and reverse the steps above to reassemble.