IBM RS6000 - 7026 - H70, Service Manual

Page: 33 / 358

Symptom Action
The system does not respond to the password
being entered or the system login prompt is
displayed when booting in service mode. Verify that the password is being entered from
the ASCII terminal or keyboard defined as the
system console. If so, then the keyboard or its
controller may be faulty.
1. If entering the password from the keyboard
which is attached to the system, replace the
keyboard. If replacing the keyboard does not
fix the problem, replace the I/O planar. (See
notes on 2-1.)
2. If entering the password from a keyboard
which is attached to a ASCII terminal,
suspect the ASCII terminal. Use the
Problem Determination Procedures for the
terminal. Replace the I/O planar if these
procedures do not reveal a problem.
Nothing is displayed on the system console, and
the operator panel is blank. 1. If using a graphic display, go to the Problem
Determination Procedures for the display.
2. If you do not find a problem then replace the
display adapter.
3. Go to “MAP 1540: Minimum Configuration”
on page 2-17.
All display problems. 1. If using a graphics display, go to the
Problem Determination Procedures for the
display.
2. If you do not find a problem then replace the
display adapter.
3. If the problem is with the ASCII terminal:
a. Make sure that the ASCII terminal is
connected to S1.
b. If problems persist, go to the Problem
Determination Procedures for the
terminal.
4. If you do not find a problem then suspect
the I/O planar. Go to “MAP 1540: Minimum
Configuration” on page 2-17.
888 is displayed in the control panel followed by
additional error codes. Go to the Fast Path MAP in the IBM RS/6000
Diagnostic Information for Multiple Bus Systems.
Chapter 2. Maintenance Analysis Procedures
2-3