Epson Equity 286 PLUS - Manual (Page 219)

If you see one of the following errors, there may be a problem
with the controller or the test cable:
Error - Break detected
Error - Framing error
Error - Overrun error
Error - Parity error
Error - Time out!
Check to make sure that the test connector is securely
connected to the port. If the error persists, contact your dealer.
Exiting System Diagnostics
To exit from the System diagnostics program, press E SC You see
the following prompt:
DO YOU want to exit diag (Y/N)? N
Before you press a key, remove the Reference diskette from drive
A. If you do not have a hard disk, insert your MS-DOS Startup
diskette in the drive. Then press Y and
Enter to exit the
program. You see this message:
Stand by while system is rebooting.
The computer loads MS-DOS and you see either the C> or A>
prompt.
Performing System Diugnostics C-25