IBM Personal Computer XT Manual To Operations page 169

Test 8010
1
Check your wall outlet for proper operation (use
a working lamp).
2
Verify that the Printer Cable is properly
connected to the printer and system unit.
Did you find any problem while doing the above
step?
NO - Go to the next step.
YES- Correct the problem and perform the
system diagnostic tests again.
3
Set the Power switches on the printer and
.~
system unit to Off.
(If
an expansion unit is
attached, also set its Power switch to Off.)
4
Disconnect the Printer Cable.
April 1984
Test 8010-1