IBM 3270 Maintenance Manual page 321

3-1800-6
1.
Set the Power switch on the system unit and
expansion unit to Off.
2. Connect the expansion cable at the system
unit, if you removed it in an earlier step.
3.
Remove all option adapters from the
expansion unit, except the receiver card.
4.
Make sure the Diagnostics diskette is
inserted.
5.
Set the Power switch on the expansion unit to
On.
6. Set the Power switch on the system unit to
On.
7.
When the
1801
error code appears, press PFI
to continue.
CONTINUE
Maintenance Information