Tandy 3000  (250-4001)              Battery             Faxback Doc. # 1365


For replacement, order the appropriate part from National Parts.

Part Number   Voltage     Description

CS 0232       3.6 volt    Lithium Clock Battery (3 pin connector)
CS 0092       7 volt      Lithium Clock Battery (4 pin connector)

Note: If the battery is marked 6.8 volts, the 7.0 volt battery is the
      correct replacement.

With normal system use, the battery that powers the Tandy 3000 CMOS chip
should last at least three years before you need to replace it.

Note: If you are storing the computer for long periods of time, you can 
extend the life of the battery by unplugging it from the main board until you
are ready to use the computer again.

If the battery ever fails and the CMOS memory is erased the following prompt
is displayed when you turn on the computer.

     INVALID CONFIGURATION INFORMATION -- PLEASE RUN
     SETUP PROGRAM
     STRIKE THE F1 KEY TO CONTINUE

Insert the Utilities diskette, and follow the instructions.

Note: If you have a battery problem that cannot be immediately corrected, 
you can still use the computer by running the Setup program each time you 
turn on the computer.

To remove and replace the battery:

1. Remove the system unit cover.
2. Locate the battery.
3. Follow the wires from the battery to the connector on the Main Logic
   Board.
4. Remove the lock-type connector from the main logic board by pushing the
   lock-lip away from the internal drive and, at the same time, lifting the
   connector.
5. Be careful when disposing of this battery!

WARNING: Improper handling of this special lithium battery can cause a
fire, explosion, or severe burns. Never recharge, disassemble, or heat the
battery above 100øC (212øF). Never solder directly to the battery, or expose
the contents of the battery to water.

6.  Insert the new battery's connector on the Main Logic Board.
7.  Attach the new battery to the Velcro strip on the side of the drive tower.
8.  Replace the system unit cover.