Epson 486SX - Manual (Page 195)

System diagnostics tests (continued)
Device
Dot matrix printer
Hard disk drive(s)
and controller
Parallel port on a
video adapter
Alternate parallel
port
Tests available
Seek check
Write, read check
Read, verify check
Run all above checks
Description
Tests the operation of a
dot matrix printer in
several modes; requires
the printer to be
loaded with paper
Tests the operation of
the hard disk drive(s)
Tests the secondary
parallel port; similar to
primary parallel port test
Tests the parallel port
included on a video
adapter; requires a
loop-back connector
(contact your dealer)
Error Messages
The following table lists all the error messages that may appear
during System diagnostics testing.
System diagnostics error messages
Error code Message
System board
101 CPU error
102 ROM checksum error
103 Timer counter register error
104 Timer counter error
105 Refresh error
106 DMA page register error
C-10 Performing System Diagnostics