IBM R30 Operator's Manual page 198

Step 6
(From Steps 3, 4, 5, 7)
This step loads the diagnostics.
1. Set the mode switch to the Service position.
2. Be sure the power switches of the attached devices are set to On.
3. Set the power switch on the system unit to On.
4. If c31 is displayed, follow the displayed instructions to select a console display. If you
do not have a console display, set the key mode switch to the Normal position and then
set it to the Service position to indicate to the diagnostics there is no console display.
If you cannot select a console display, go to Step 20. Otherwise, continue to the next
substep.
5. Wait until one of the following conditions occurs, then go to the next substep:
The power-on light does not come on, or it comes on and does not stay on.
The same number is displayed in the operator panel display for longer than three
minutes, and the power-on light is on.
The number 888 is flashing in the operator panel display.
The operator panel display is blank.
The system stops with two or more numbers between 221 and 296 alternating in the
operator panel display.
The words DIAGNOSTIC OPERATING INSTRUCTIONS are displayed.
11-4
Operator Guide