Epson Progression U12 - Manual (Page 176)

3. If you still have trouble with your SIMMs, write down any
error messages that appear and contact your dealer.
Math Coprocessor Problems
If the math coprocessor in your system does not seem to be
operating properly, check the following:
1. Run the SETUP program to make sure the math coprocessor
is listed as Yes in the Installed equipment information. If it
is listed as No (not installed), you or your dealer may have
installed the math coprocessor incorrectly. See Chapter 2 of
the Setup Guide and Chapter 3 of this manual for more
information.
2. If your math coprocessor is listed correctly in SETUP but
still does not seem to be working, test it by running the
Numeric coprocessor diagnostic test described in Chapter 5.
Caution
If you need to remove a math coprocessor, contact your
dealer; you must not attempt to remove it without a
special extraction tool.
7-24 Troubleshooting