Epson LT-286 - Manual (Page 125)

Diskette Drive Seek Check
The computer checks its diskette drives by testing the drive
mechanism for any malfunction. If any seek errors are found, you
see this message:
601-Diskette error
Hard Disk Controller and Hard Disk Check
The computer next checks the hard disk controller and drive unit.
If a malfunction is found in the hard disk controller, you see this
error number and message:
1782-Disk controller failure
If an error is found in the hard disk drive unit, one of these error
messages appears:
1780-Disk 0 failure
1790-Disk 0 error
C-4 Power-On Diagnostics