4: Repair External Assemblies
86
Therapy Knob
Preparation
1 Turn the device off.
If the Knob is broken or lost, use pliers to turn the device off. The shaft should be positioned as
shown in Figure 47. If the Shutting Down in ... seconds message is displayed, then the Therapy
Switch is in the Off position.
2 Disconnect all external power and remove the battery.
Removal and Replacement
1 Pull the Knob off its shaft.
Grasp the Knob and pull straight out from the front of the device. Use pliers if necessary, however be
careful not to damage the Knob if you are going to reuse it.
NOTE: Do not remove the screw under the Knob.
2 Align the flat side of the copper clip inside the Knob with the flat surface on the shaft and press the
Knob into place.
Make sure the Knob is pressed fully into place and its rim is almost flush with the front panel.
3 Make sure the Knob rotates freely and that it points to the correct markings on the front panel.
4 Make sure the Knob does not rotate beyond the last marking on the label.
To Complete the Replacement:
1 Perform Performance Verification and Safety testing as described in the “Performance Verification”
chapter.
2 Perform the “Controls Test” on page 162.
Figure 47 Therapy Knob Replacement
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