Epson LT-286 - Manual (Page 131)

System Board Check
Use this option to check the operation of each major component
on the system board, including:
l
The 80286 CPU chip
l
The system ROM
l
The real-time clock, CMOS RAM, and battery
l
The main integrated circuits.
The checks made on the 80286 CPU chip are very comprehensive
and ensure that the CPU instruction set, including protected-mode
operation, is functioning correctly. If an error occurs, write down
the error message, or print it out, and contact your Epson dealer.
Attempting to correct system board errors yourself may violate your
warranty agreement.
Memory Check
Use this option to check the memory installed in your computer,
including expansion memory.
For this check, the program writes specific data into memory and
then reads it back. The data is written and read in blocks of 64KB.
A parity check is also made on each block. A count of memory is
displayed after each block that is tested without an error. The final
message is usually:
000640KB OK
If an error occurs, write down the error message, or print it out, and
contact your Epson dealer. Attempting to correct memory errors
yourself may violate your warranty agreement.
Note
Extended memory above 640KB, which is normally not available
to MS-DOS, is checked using the protected mode of the 80286
CPU chip.
D-6 Performing System Diagnostics