Service manual

The Control Board Assembly

5-17

5The Control Board Assembly

This section describes how to remove and replace the control board assembly. This

procedure applies to all units.

Removing the Control Board Assembly

To remove the control board assembly:

Use an electrostatic wrist band or other approved method for protection against

electrostatic discharge when disconnecting cables from and handling the control board

assembly.

1. Perform the procedures Removing the Battery and Removing the Keyboard Assembly.

2. Perform the procedure Opening and Removing the Top Cover Assembly.

Connectors J301 and J302 are very tight. A firm grasp is necessary to disconnect them.

3. Disconnect control board connector J301 by grasping all the wires of the connector

and pulling straight out. Repeat with connector J302.

4. Disconnect control board connector J305 by lifting the capacitor board up and off its

mounting posts. Then grasp the large ferrite bead and pull straight up from J305.

5. Using a wide thin-bladed flat-tip screwdriver, remove the two jack nuts securing the

patient cable connector on the front of the unit.

6. Slide the control board toward the rear of the unit and lift out.

Replacing the Control Board Assembly

To replace the control board assembly, perform the above procedure in reverse order.

Make sure the jack screws are tight.

CAUTION

NOTE