CHAPTER 6: Troubleshooting
75
6.2.2 Can’t Switch Ports from Keyboard
A.
Can you do
anything
from the keyboard? If not, the keyboard strand of your
MKM cable has probably come loose. Reconnect it.
B.
The ServSwitch might have lost power for less than three seconds. (This can
cause the keyboard to lock up.) Disconnect the keyboard and plug it back in.
C.
The keyboard might simply have gotten a little off kilter. If the Switch can see
the keyboard at all, try reinitializing the keyboard with the Reset command,
[Ctrl] R (see
Section 4.3.6
).
D.
The keyboard mode that the currently selected CPU port is set for might not
match the mode that the CPU on that port expects. Use the on-screen display to
change the port’s mode (see
Section 5.3.2
). Sometimes this situation can confuse
the CPU or keyboard so badly that it is necessary to reboot the CPU or to reset
the keyboard by unplugging it and plugging it back in.
E.
For PS/2 type equipment, if the keyboard and mouse strands of either the CPU
cable or the MKM cable have been reversed, plug them into the proper ports.
F.
You might be using the keyboard incorrectly. Make sure to use the
left
Control
key to start port-switching commands. Make sure to use the numeric keys at the
top of the keyboard rather than the numeric keypad when you type in port
numbers. Make sure to release the Control key before you start typing in a port
number. Make sure you don’t wait too long before you enter a port number.
Make sure you don’t accidentally hit keys such as Shift, Caps Lock, or Alt.
6.2.3 Typed Characters wrong or Missing
The keyboard mode that the currently selected CPU port is set for might not
match the mode that the CPU on that port expects. See item C under
Section 6.2.2
.
6.2.4 Can’t Switch or Scan to Certain Ports
A.
The “Maximum computers” setting is too low. (If any of the CPUs you
can
access are receiving garbage characters, this is a good indicator.) Set
“Maximum computers” to match the number of CPUs in your system (see
Section 5.2.3
).
B.
The “Expansion units” and/or Expansion width” setting is wrong. To reach all
ports, set Units equal to the number of submasters in your system, and Width
equal to the greatest number of CPUs you have on any submaster (see
Sections 5.2.4
and
5.2.5
).