Replacing Non-Volatile Ram Battery - Keithley 2701 Service Manual

3-6 Routine Maintenance
8.
9.

Replacing non-volatile RAM battery

The Model 2701 has a rechargeable lithium ion battery for non-volatile RAM. Use the pro-
cedure below to replace the battery, if required. Refer to the disassembly procedures in
Section 5
information.
WARNING
WARNING
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2.
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5.
Carefully clean the repaired area of the circuit board with a foam tipped swab or brush
dipped in pure water, then blow dry the board with dry nitrogen gas. Allow the board to
dry for several hours in a 50°C low-humidity environment before use.
Re-install the circuit board into the plastic housing, then close the top cover.
and the parts list and component layout drawings at the end of
There is a danger of explosion if the battery is incorrectly replaced.
Replace only with the part designated by the corresponding Keithley part
number. Dispose of used batteries according to the manufacturer's
instructions.
The following procedure is intended only for qualified service personnel.
Do not perform this procedure unless you are qualified to do so.
Disconnect the line cord and all connecting wires from the Model 2701
before removing the top cover.
The precautions below must be followed to avoid personal injury.
• Wear safety glasses or goggles when working with lithium ion
batteries.
• Do not short the battery terminals together.
• Keep lithium ion batteries away from all liquids.
• Observe proper polarity when installing the battery.
• Do not incinerate or otherwise expose the battery to excessive heat
(>60°C).
• Bulk quantities of lithium ion batteries should be disposed of as haz-
ardous waste.
Before replacing the battery, refer to the troubleshooting procedures in
Section 4 to determine if the battery requires replacement
Remove the Model 2701 top cover and motherboard using the disassembly procedures
in Section 5.
Remove the battery from its holder on the bottom of the case near the front panel.
Install a new battery, Keithley part number BA-52.
Re-install the motherboard and top cover by following the disassembly procedures in
Section 5 in reverse order. Be sure to plug in all cables including the cable that connects
the battery to the motherboard at J900.
Model 2701 Service Manual
Section 6 for more
Table 4-4 in