Digital Equipment VAXstation 3100 Maintenance Manual page 266

Diagnostic LED Definitions 245
described in each step in the following procedure until the system does power
up normally. Once the system does power-up normally, the last FRU you
disconnected is th. e failing FRU. Replace the failing FRU and retest the system
for any further problems.
1. Power down the system. Remove the system box cover, disconnect the
cable connecting the system module to the MSC module, and disconnect
the power cables to the drives. This disconnects the MSC module and all
of the drives from the system.
2. Power up the system with the MSC module disconnected.
If
the system
still does not power up properly, the problem js not with the drives or the
MSC module, proceed to step 3.
If
the system does power up successfully
after disconnecting the MSC module, replace the MSC module and retest
the system.
3. Power down the system, remove drive mounting panel(s) from the system,
and remove the graphics module from the system module.
lf
the graphics
module was not installed, proceed to step 5. When you power up the
system after removing the graphics module, you must either connect an
alternate console terminal to the printer port and set
@fil
to the up position
(9600 baud rate) or watch the LEDs to see if the system does or does not
power up successfully. The alternate console is used to display the video
because there is no video signal output to the monitor when the graphics
module is disconnected.
4. Power up the system with the graphics module disconnected.
If
the system
still does not power up properly, the problem is not
in
the graphics module,
proceed to step 5. lf the system does power up successfully, replace the
graphics module and retest the system.
5.
Power down the system, remove the memory module from the system
module.
6. Power up the system with the memory module disconnected.
lf
the system
does not power up properly, the problem is not the memory module,
proceed to step 7. ff the system does power up successfully, replace the
memory module and retest the system.
7. Power down the system. Replace the system module and power up the
system again. ff the system still does not power up properly after replacing
the system module, replace the power supply.