1680X Chess Computer  (600-2428)     Preparation       Faxback Doc. # 6781

INSTALLING/REPLACING BATTERIES

Your chess computer uses 4 AA  batteries (not included).  Fresh alkaline
batteries, such as Radio Shack Cat. No. 23-552, can provide up to 200
hours of playing time.

1.  Switch I/O to O.

2.  Press down on the battery compartment cover's arrow, then slide the
    cover in the direction of the arrow.

3.  Lift and remove the cover.

4.  If necessary, remove and discard the old batteries.

5.  Insert 4 AA batteries as indicated by the polarity symbols (+ and -)
    inside the compartment.

Caution:  Batteries installed incorrectly might leak and damage the
          computer.

6.  Replace the cover.

Cautions:  Use only fresh batteries of the required size and type.

           Never leave dead or weak batteries in the computer.

           If the computer will not be used for several days, and you do
           not want to save a game, remove the batteries.

           Do not mix old and new batteries.

           Dispose of batteries properly; do not bury or burn them.

If the computer does not function properly, replace the batteries.  If it
continues to function improperly, you may need to reset the computer.

USING AN OPTIONAL AC ADAPTER

With an optional AC adapter, such as Cat. No. 273-1455, you can operate
the computer from household AC power.

Note:  To save game information, you must install batteries in the
       computer even if you are using an optional AC adapter.

Cautions:  You must use an AC adapter that supplies 9 volts and delivers
           at least 100 milliamps.  Its center tip must be set to
           negative, and its plug must correctly fit the 9VDC/100mA jack
           on the back of the computer.  Using an adapter that does not
           meet these specifications could seriously damage the computer
           or the adapter.

           Turn off the Computer by switching I/O to O before you plug or
           unplug the AC adapter or its barrel plug.

           Unplug the AC adapter from the AC outlet before you unplug its
           barrel plug from the computer.

Follow these steps to use an AC adapter.

1.  Switch I/O to O.

2.  Insert the AC adapter's barrel plug into the 9VDC/100mA jack on the
    back of the computer.

3.  Plug the AC adapter into a standard AC outlet.

RESETTING THE GAME

If your computer does not work properly after you replace the batteries,
you might need to reset it.  Insert a pointed object such as a
straightened paper clip into the ACL hole on the bottom of the computer
for about 2 seconds.

(br/all-7/12/94)