External Assemblies 4: Repair
89
Therapy Knob / Smart Select Knob
Preparation
1 Tu r n t h e d e v i c e o f f .
2 Disconnect all external power and remove the battery.
Removal and Replacement
1 Pull the Knob off its shaft.
Use pliers to grab the center of the Knob and pull it straight out shaft. Make sure that the plier lips
have smooth surface which will not damage the cosmetics of the Knob.
NOTE: Do not remove the screw under the Therapy Knob.
2 Align the flat side of the copper clip in the Knob with the flat surface on the shaft and press the
Knob into place until it is fully seated.
Make sure the Knob’s rim is almost flush with the front panel.
3 Make sure the Knob rotates freely and that the Therapy Knob points to the correct markings on the
front panel.
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 160.
Figure 55 Knob Replacement
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