Model 2750 Multimeter/Switch System Service Manual Routine Maintenance 3-7
Routine Maintenance
WARNING The precautions below must be followed to avoid personal injury.
• Wear safety glasses or goggles when working with lithium
batteries.
• Do not short the battery terminals together.
• Keep lithium batteries away from all liquids.
• Do not attempt to recharge lithium batteries.
• Observe proper polarity when installing the battery.
• Do not incinerate or otherwise expose the battery to excessive heat
(>60°C).
• Bulk quantities of lithium batteries should be disposed of as hazardous
waste.
• Dispose of used batteries according to all federal, state, and local laws.
Replace the battery as follows:
1. Before replacing the battery, refer to the troubleshooting procedures in Table 4-4 in
Section 4 to determine if the battery requires replacement
2. Remove the Model 2750 top cover using the disassembly procedures in Section 5.
3. Locate battery BT100 using the motherboard component layout drawing at the end
of Section 6.
4. De-solder the battery from the top side of the circuit board.
5. Install a new battery, Keithley part number BA-51, taking care to observe proper
polarity.
6. Solder the battery connection to the circuit board using organic (OA-based) flux
solder.
7. After soldering, remove all flux using a foam-tipped swab or brush dipped in pure
water. Blow dry the board with dry nitrogen gas, then allow the board to dry for
several hours in a 50°C, low-humidity environment before use.
8. Reinstall the top cover by following the disassembly procedures in Section 5 in
reverse order.
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