4: Repair Internal Assemblies — Front Chassis
118
Clock Battery
The rechargeable lithium Clock Battery resides on the Processor PCA, next to the Therapy Knob
connector. A cable tie wrap and a package of ProGold wipes are included in the replacement kit. Make
sure you clean the contact clips and the new battery terminals with a ProGold wipe and replace the cable
tie wrap that holds the battery in place.
Preparation
1 Open and separate the case. See “Opening the Case” on page 87.
2 Pivot the Rear Chassis downward. See “Pivoting Rear Chassis Downward” on page 108.
3 Position the device with the display facing down and the Measurement Module to your left.
Removal and Cleaning
1 Remove the battery from the Processor PCA.
a Use a pair of fine-nose wire cutters to cut and remove the cable tie wrap that holds the battery in
place.
b Remove the battery from the holder.
c Follow local rules and regulations regarding battery disposal.
2 Thoroughly clean the contact clips and new battery terminals with the wipes included in the kit.
Replacement
1 Insert the new battery into the holder.
CAUTION: Make sure that you install the new battery with the correct orientation. Follow the polarity markings on
the battery holder (under the battery).
2 Bend the cable tie wrap to thread it through a small hole to the left of the battery and out of the
square opening to the right.
3 Secure the battery with the cable tie wrap.
Do not overtighten; use your hands, not pliers.
4 Cut off the excess tie wrap.
5 Bring the Rear Chassis into the upright position. See “Pivoting Rear Chassis Downward” on
page 108.
6 Close the case. See “Closing the Case” on page 151.
To Complete the Replacement:
Run Performance Verification and Safety testing as described in the “Performance Verification”
chapter.
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