FlowDiagrams 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. Youmust halt the operating

system and turn off AC power before replacing the clock board.

Figure10-8 Diagnosinga Defective Clock Board
!
INDICATION
System will not boot.
Clock board yellow “service”
LEDdoes not light dur ing
POST or remains lighted
after POST.
Systemand 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
Table9-1
See Figure 10-7.
Section 9.1, “Using a Terminal.”