IBM 3270 Maintenance Manual page 86

1.
Get the Diagnostics diskette from the back' of
this manual. -
2. Insert the Diagnostics diskette into drive A
and push the load lever down.
3.
Set the Power switch for the system unit (and
expansion unit, if attached) to Off (0) and
wait five seconds.
4.
If you have an expansion unit, set its Power
switch to On
(I).
5. Set the Power switch for the system unit to
On
(I).
DID YOU GET A LONG PAUSE AND ONLY
ONE BEEP?
YES Go to "Coprocessor Check 85" on
page 3-85-1.
NO
October 1984 3-25-11