Digital Equipment DEC 10000, Руководство по обслуживанию, Страница: 33 / 70

Servicing the CPU 2-7
After you have removed and replaced the defective module, following the
instructions in Chapter 1, take the following steps:
1. Power up the system. Self-test is run and you need to decide whether
the new CPU module is functioning properly. If it is not, try reseating
the new CPU and/or refer to the Advanced Troubleshooting manual;
otherwise continue.
2. Retrieve the console printout of environment variables, system serial
number, custom boot paths, and any other system-specific configura-
tions saved in the Site Management Guide .
If this information has not been saved, you can find the system serial
number on the barcode at the back of the system cabinet on the sur-
face just below the AC input box. Details on boot paths and changed
console environment variables you will need to get from the system
manager.
3. Once you have collected the data you need, enter the console com-
mands shown in Example 2-1 that you need. For example, you may
or may not need to use the
show device
command, which sizes the
system and can be used to see what devices are available. The fields
after the device name indicate the path to the device and are neces-
sary when specifying the
bootdef_dev
environment variable.
a. You will definitely need to set the system serial number.
b. You will definitely need to set the
bootdef_dev.
c. For example, you may need to set the
boot_osflags
depending
upon the operating system used and how the system manager nor-
mally boots the system.
d. If you have a list of environment variables from the Site Manage-
ment Guide , you will want to compare it against the output given
by the
show *
command. If there are differences, you will want to
change the variables using commands similar to those that follow.
e. You may need to set one or more special boot paths depending
upon how the system manager configures the system.
4. Once the console environment is set up, verify the repair by booting
the system. If there are alternative boot paths, you will want to make
sure that all boot paths function properly.
5. Use the
set eeprom field
command to enter the 8-digit LARS number
and a short message (up to 68 characters), stating the date and reason
for service, into the EEPROM.
6. Boot the system and return control to the customer.