Epson EQUITY 386/33 PLUS - Manual (Page 172)

Math Coprocessor Problems
If your math coprocessor does not seem to be operating
properly, check the following:
1. Run the SETUP program and check to make sure that the
math coprocessor is listed as Installed on the SETUP
display. If it is Listed as Not installed, you or your
dealer may have installed the coprocessor incorrectly. See
Chapter 2 of the Setup Guide and Chapter 4 of this manual
for more information.
your dealer for information about a special extraction
tool; do not attempt to remove it without this tool.
2. If your math coprocessor is listed as Installed 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.
C-24 Troubleshoofing