Before You Replace Any Frus - DEC VAXmate Service Manual

FRU Replacement
IIIII
5.2 Before You Replace Any FRUs
The following rules apply when you are removing or installing VAXmate FRUs.
• You must always turn off the power and unplug all external cables before
you remove any FRUs (Paragraph 5.3.1).
WARNING
When disconnecting the network cable, always follow the procedure
shown in Figure 2-16. Do not disconnect the T-connector at the
terminator or cable. Always disconnect the T-connector from the
VAXmate workstation.
• Always use a grounded wrist strap and grounded work surface when you
open the system unit or expansion box, or handle any internal compo-
nents. Static electricity can damage printed circuit boards and mass stor-
age devices.
• After you replace an FRU, make sure to run the Power-up test, the
Extended Self-Test, and the Service Diagnostics' System test. If you
replace the 2 Mbyte memory, the modem, or any FRU in the Expansion
Box, also make sure to run the individual test for that component.
These tests verify that the new component functions correctly and also
report any additional errors.
• Whenever the expansion box is separated from the system unit the event
timer stops. The event timer, located in the system unit, receives power
from the battery, located in the expansion box. Therefore, when you
attach the expansion box to the system unit, you should run the
Extended Self-Test to check the system configuration.
NOTE
Set the power switch to off and wait 15 seconds for the hard disk to
stop spinning. Set the power switch to on and let the power up test
complete. Then, run the Extended Self-Test.
5-3