Sun Microsystems Ultra 1 140 Service Manual page 60

4
4.8 System Board Test
4-14
Example:
ok probe-scsi-all
/sbus@1f,0/dma@1,81000/esp@1,80000
Target 2
Unit 0 Disk
/sbus@1f,0/espdma@e,8400000/esp@e,8800000
Target 0
Unit 0 Disk
Target 1
Unit 0 Disk
Target 6
Unit 0 Removable Read Only device
5301TASUN4XCD1735
On the keyboard, press and hold the Stop and D keys. While holding the keys
down, turn the system's power switch on and watch the lights on the
keyboard.
This action puts the system into Power-On Self-Test (POST) mode. The Caps
Lock key on the keyboard should flash on and off, indicating that the system is
running the built-in tests.
If a failure occurs during POST, one of the other keys on the keyboard may
light, indicating a failed system part. See Section 3.5, "System and Keyboard
LEDs" for the meaning of the failure codes. If a failure code appears, replace
the defective part indicated by the code.
If the Caps Lock key fails to flash on and off after you have pressed and held
the Stop and D keys, POST has failed. The most probable cause of this type of
failure is the system board.
However, other optional parts in the system could cause POST to fail in this
way. Before replacing the system board, you should remove any optional SBus
cards and memory and run the test again. The system only requires two
DSIMMs in slot U0701 and U0601, the main logic board, the power supply, and
the keyboard to be installed. By removing the other parts and testing the
system again, you eliminate the possibility that those parts are causing the
failure.
Sun Ultra 1 Series Service Manual—November 1995
SEAGATE ST41600N SUN1.3G00286965
SEAGATE ST31200W SUN1.058724
SEAGATE ST5660N SUN05350638
TOSHIBA XM-