Replace The Battery As Follows - Keithley 2750 Service Manual

Model 2750 Multimeter/Switch System Service Manual
WARNING

Replace the battery as follows:

1. Before replacing the battery, refer to the troubleshooting procedures in
Section 4
2. Remove the Model 2750 top cover using the disassembly procedures in
3. Locate battery BT100 using the motherboard component layout drawing at the end
of
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
reverse order.
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.
to determine if the battery requires replacement
Section 6.
Routine Maintenance
Table 4-4
Section
Section 5 in
3-7
in
5.