Digital Equipment DECstation 5000/100 Series, Maintenance Manual

Page: 84 / 392

WS33M091
Start
Yes
No
Yes
No
Yes
No
Do all the LEDs
display 1111 1111 as soon
as the power turns on?
Is a replacement CPU
module available?
Replace the CPU module.
Remove all TURBOchannel modules.
If the LEDs still display 1111 1111,
obtain a replacement system module
and CPU module.
Do the LEDs still
display 1111 1111?
Install the original CPU
module. Then remove any
TURBOchannel modules.
Yes
Replace the system module.
No
Refer to "Troubleshooting When ULTRIX
Is Running but There Is No DIsplay on
the Monitor."
display 1111 1111?
Do the LEDs still
End
(Continued)
Figure 4-2. Troubleshooting when the LED display is 1111 1111,
0011 1111, 0011 1110, or 0011 1101
4–6 Identifying Failed FRUs