Epson 3865X Plus - Manual (Page 291)

Math Coprocessor Problems
If your math coprocessor does not seem to be operating
properly, check the following:
1. Run the Setup program on your Reference diskette and
check to make sure that the math coprocessor is listed as
installed on the Exit display. If it is listed as not
installed, you or your dealer may have installed the
math coprocessor incorrectly. See Chapter 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 the coprocessor.
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 the math coprocessor for any
additional procedures you may need to perform or any
troubleshooting information.
3. If you are still having trouble with your math coprocessor,
test the coprocessor by running the System diagnostics
program on your Reference diskette. See Appendix E for
instructions. If your math coprocessor came with its own
diagnostic programs, check the documentation that came
with it and run those tests also.
D-30 Troubleshooting