Epson Equity 286 PLUS - Manual (Page 239)

Battery Problems
The battery in your computer is a 3.6 volt, lithium battery. It
should last from three to five years before you need to replace it.
When the battery’s life is exhausted, you may see an error
message.
After you purchase a new battery pack, follow the instructions in
Chapter 5 to install it. (You may want your dealer to install it
for you.)
Math Coprocessor Problems
If your math coprocessor does not seem to be operating properly,
check the following:
1.
2.
3.
Run the SETUP program and check to make sure that the
math coprocessor is listed as
Insta11ed on the SETUP
display. If it is listed as Not installed, you or your
dealer may have installed the coprocessor incorrectly. See
Chapters 2 and 5 for more information.
Caution
Do not attempt to remove the math coprocessor yourself.
Contact your dealer for information about a special
extraction tool that is needed to remove it.
If your math coprocessor is listed as Instal1ed in the
SETUP program but still does not seem to be working,
check the manual that came with it for troubleshooting
information and for any diagnostic procedures you can
perform.
Did you or your dealer set jumper J2 to indicate whether the
math coprocessor is 8 MHz or 10 MHz? See Chapter 5 for
more information.
D-20 Troubleshooting