Epson 20 - Manual (Page 176)

Error codes and messages (continued)
Error code Message
Alternate serial port
1201 control
signal ALWAYS LOW
1201
control signal ALWAYS HIGH
1202 TIMEOUT ERROR
1203 VERIFY ERROR
Dot-matrix printer
1401 status
Hard disk drives and controller
1701 SEEK ERROR
1702 WRITE ERROR
1703 READ ERROR
1704 HEAD ERROR
1705 ERROR DETECTION ERROR
1706 ERROR CORRECTION ERROR
Alternate parallel port
2101 ERROR PIN p
C-32 Performing System Diagnostics