System Board Test; Caps Lock Key Fails To Flash On And Off During Post - Sun Microsystems SPARC classic Service Manual

4.2.2

System Board Test

1. Connect a terminal to serial port A or use a tip connection to another workstation
to receive additional POST failure information.
To set up a tip connection to another workstation, see Section 3.4.1 "Setting Up a
tip Connection to Another Workstation."
2. Press and hold the Stop-d keys. While holding the keys down, turn the system
power switch on. Watch the keyboard LEDs.
a. The Caps Lock key on the keyboard should flash on and off, indicating that the
system is running the Power-On Self-Test (POST).
If the Caps Lock key fails to flash on and off after you have pressed and held the
Stop-d keys, POST failed.
b. To further troubleshoot the system board, see Section 4.2.2.1 "Caps Lock Key
Fails to Flash On and Off During POST."
3. Observe the keyboard LEDs.
If a failure occurs during POST, an LED may light up.
"Power-On Self-Test (POST), describes types of problems that occur when an LED
on the keyboard lights up.
4. Replace the defective part indicated.
4.2.2.1

Caps Lock Key Fails to Flash On and Off During POST

1. Remove optional SBus cards and SIMMs.
Leave a pair of SIMMs in Bank 1.
2. Run POST again before replacing the system board.
Remove all other parts to eliminate the possibility that parts you removed could
cause the POST failure.
in Chapter 3
TABLE 3-1
Chapter 4 Troubleshooting Procedures 4-5