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Flow Diagrams for Troubleshooting 10-9
10
10.8 Defective Clock Board
There is one clock board in the system.
Caution – The clock board is not hot-pluggable. You must halt the operating
system and turn off AC power before replacing the clock board.
Figure 10-8 Diagnosing a Defective Clock Board
!
INDICATION
System will not boot.
Clock board yellow “service”
LED does not light during
POST or remains lighted
after POST.
System and board LEDs do not
flash, or fail POST
repeatedly with random
LED patterns.
TTY port A does not respond.
Begin
End
TEST/PROCEDURE
Examine LED displays.
Check clock board.
Check clock board and power
supplies.
Check settings for the port.
Replace peripheral power supply.
REFERENCE
Table 9-1
See Figure 10-7.
Section 9.1, “Using a Terminal.”