v Under some conditions the system may stop, with instructions displayed on attacheddisplays and terminals. Follow the instructions to select a console display.Running Diagnostics from a TTY TerminalConsider the following when you run diagnostics using a TTY-type terminal as theconsole display:v See the operator manual for your type of TTY terminal to find the key sequences youneed to respond to the diagnostics. For the 3151, refer to the3151 ASCII DisplayStation Guide to Operations, form number GA18-2633. For the 3164, refer to the3164 ASCII Color Display Station Description, form number GA18-2617.v When the diagnostics present display information through the S1 port, certainattributes are used. These attributes are set as if the diagnostics were using a 3161display terminal. Refer to the tables in “Appendix D. General Attributes RequiredWhen Using a TTY Terminal” on page 165 for a list of attributes for the 3161 ASCIIDisplay Terminal and for two other ASCII display terminals commonly used with thesystem.v If you have a TTY terminal other than a 3151, 3161, or 3164 attached to the S1 port,your terminal may have different names for the attributes. Refer to the tables in“Appendix D. General Attributes Required When Using a TTY Terminal” on page 165.Use the attribute descriptions listed there to determine the settings for your terminal.Online Diagnostics ModesThe Online diagnostics can be run in three modes:v Service Mode allows checking of most system resources.v Concurrent Mode allows the normal system functions to continue while selectedresources are being checked.v Maintenance Mode allows checking of most system resources.Service ModeService mode provides the most complete checkout of the system resources. Thismode also requires that no other programs be running on the system. All systemresources except the SCSI adapter and the disk drives used for paging can be tested.However, note that system memory and the processor are only tested during POST.Error log analysis is done in service mode when you select the Problem Determinationoption on the DIAGNOSTIC MODE SELECTION menu.To run Online diagnostics in service mode, use the following steps:1. Stop all programs, including the AIX operating system.2. Remove all tapes, diskettes, and CD-ROM discs.3. Turn off the system unit’s power.4. Turn on the system unit’s power.5. After the first POST indicator displays on the system unit’s console, press F6 onthe directly attached keyboard or 6 on the TTY keyboard to indicate thatdiagnostics are to be loaded.Chapter 5. Using the Standalone and Online Diagnostics 109
