Service manual

36 VAXstation 3100 (Model 76) System
The position of the Ethernet switch determines which of the Ethernet
ports provides IEEE 802.3 network communications. An LED is lit next
to the enabled port. The keyboard may only be connected to the keyboard
port on the back of the system box. The mouse may only be connected to
the mouse port on the back of the system box. The external SCSI port is
for connecting external mass storage devices to the system. The monitor
or an external mass storage device can be plugged into the switched ac
outlet.
The S3 switch next to the LEDs on the back of the system module controls
the console port. When the S3 switch is in the down position, it enables
the monitor connected to the monitor port to be the console. When the S3
switch is in the up position, it enables a terminal connected to the printer
port to be the console.
4.2 FRU Removal and Replacement
This section describes the removal and replacement procedures for the
FRUs in the VAXstation 3100 Model 76 system.
CAUTION
Do not remove or unplug the keyboard, mouse, printer, or
terminator without turning the power OFF. If the system is up
and running, use the proper shutdown procedure prior to halting
the system.
Figure 4–2 shows the location of the major FRUs. To use this section, find
the name of the FRU that needs replacing in Table 4–1, then go to the
section listed beside the FRU. Follow the steps in the section to remove
the FRU and reverse the procedure to replace the FRU. Always test the
replaced device for proper operation.
CAUTION
Wear an antistatic wriststrap and use an antistatic mat when
replacing FRUs.