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7 Service and Maintenance
Battery Replacement
SHOCK HAZARD Only qualified, service-trained personnel who are aware of the
hazards involved should remove instrument covers. Always disconnect the power
cable and any external circuits before removing the instrument cover. Some circuits
are active and have power for a short time even when the power switch is turned off.
The internal battery powers the real-time clock. The primary function of the clock it to provide time
stamp information for the Keysight 14585A Control and Analysis Software. If the battery fails, the time
will not be available for the software. No other instrument functions are affected.
Under normal use at room temperature, the lithium battery has a life expectancy between seven and
ten years. Note that battery life will be reduced if the instrument is stored for a prolonged period at
temperatures above 40 degrees C.
The part number of the battery is Panasonic CR 2032.
Replacement Procedure
1. Remove the instrument cover as described under Disassembly.
2. Remove the Control board as described under Disassembly.
3. The battery is located on the Constellation board under the ribbon cable.
4. To access the battery, release the ribbon cables by pulling up on the locking tab.
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Keysight RP7900 Series Operating and Service Guide
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