Keypads Replacement - GE Corometrics 250cx Series Service Manual

10. Pull out the trim knob and use long nose pliers to remove the encoder washer and the encoder.
11. Reverse steps to re-install.

6.10 Keypads Replacement

SENSITIVE TO ELECTROSTATIC DISCHARGE
This procedure includes ESD sensitive parts. ESD control guidelines must be followed during this
procedure to ensure that static charges are safely conducted to the ground and not through the
sensitive device, to prevent damage to the equipment.
1. Remove the top cover as instructed in section 6.1.
2. Disconnect the inverter cable from the J1 connector on the DSP/Display board (See Figure 6-3).
3. Disconnect the DSP-to-LCD Decoder ribbon cable from the J2 connector on the DSP/Display board (See
Figure 6-4).
4. Disconnect the DSP-to-Keypad ribbon cable from the J5 connector on the DSP/Display board (See Figure
6-5).
5. Use a Phillips screw driver to remove the two screws (on both sides of the monitor) that attach the front
bezel to the chassis (See Figure 6-8).
6. Open the recorder door (When closed, the door will interfere with the bezel movement).
7. Tilt the front bezel forward and away from the chassis (See Figure 6-9).
8. To remove the volume keypad board:
a. Disconnect the Keypad-to-Volume ribbon cable from the connector on the volume keypad board.
b. Use a Phillips screw driver to remove the screw that attach display mounting bracket to the front bezel
(See Figure 6-18) and then remove the screw that attach the bracket to the display assembly (See
Figure 6-19) to remove the bracket.
c. Use a Phillips screw driver to remove the four screws that attach the volume keypad board to the front
bezel and remove the volume keypad board and the pad.
9. To remove the keypad board:
a. Disconnect the Keypad-to-Volume ribbon cable from the connector on the keypad board (See Figure
6-22).
© 2013 by General Electric Company. All rights reserved.
Chapter 6: Repair and Replacement Procedures
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