User's Manual

9-2 UltraEnterprise6000/5000/4000 Systems Manual—November1996

5. Turn the keyswitch to the diagnostic position ( ).

The system will turn on. The diagnostic position puts POST in interactive

mode and enables extensive POST tests.

Figure 9-1 TTY Serial Port A

9.2 HardwareIndicators

Use the LEDs on the system front panel or the clock board to determine if the

system is operating normally. Use the LEDs on individual boards and power

supplies to locate specific malfunctions.

Many of the LED codes listed in Table 9-1 are common to the system front

panel and various types of boards. See Table 9-2 for exceptions for LED codes

for system boards.

TTY Serial Port A