Sun Microsystems SPARCstation 20, Service Manual

Page: 47 / 266

Chapter 23
POST Error Messages
Most POST error messages are displayed at the system monitor and are self-
explanatory. Use the error messages returned by POST to troubleshoot the system.
CODE EXAMPLE 3-4
lists typical POST error messages.
Note –
In
CODE EXAMPLE 3-4
, the last error message indicates that an MBus
processor module with external cache has been installed into the system with an
MBus module with no external cache. This is not a supported configuration.
Status LEDs and Indicators
The system LED is located on the right front side of the chassis and lights when the
system is operating.
FIGURE 3-1
shows the location of the system LED.
TABLE 4-1
on
page 27 suggests corrective actions when the system LED is not lit.
CODE EXAMPLE 3-4
Typical POST Error Messages
STATUS : Power-On SelfTest FAILED ... SIMM <J0201> Not Installed
STATUS : Power-On SelfTest FAILED ... Replace MBUS0 Module
STATUS : Power-On SelfTest FAILED ... Replace MBUS1 Module
STATUS : Power-On SelfTest FAILED ... Replace Main Logic Board
STATUS : TMS390Z55 and TMS390Z50 Modules can NOT be mixed. No POST
run.