Compaq Armada V300 Compaq Armada E500 and Armada V300 Series Maintenance and S - Page 73

Table 2-19, Solving USB, Problems

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Problem External device connected to a USB connector does not work. External device connected to USB connector does not work during startup (before Windows 95 loads). External devices in lower tiers do not work. Table 2-19 Solving USB Problems Possible Cause Solution The operating Reduce the number of system limits connected external USB external devices devices to no more than connected by USB to two hubs on the first tier, two tiers that can and no more than one include no more than keyboard and one two hubs on the first pointing device on the tier and no more first or second tier. than one keyboard and one pointing device on the first or second tier. During startup, only two tiers are supported by the USB port. These tiers can include no more than two hubs on the first tier and no more than one keyboard and one pointing device on the first or second tier. Use the external device only after Windows 95 or Windows 98 has loaded. Reduce the number of connected external USB devices to no more than two hubs on the first tier, and no more than one keyboard and one pointing device on the first or second tier. An unpowered hub is Use only powered hubs. connected to another Make sure that all unpowered hub. unpowered hubs are immediately preceded by powered hubs in the USB chain. 2-38 Troubleshooting

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2-38
Troubleshooting
Table 2-19
Solving USB
Problems
Problem
Possible Cause
Solution
External device
connected to a USB
connector does not
work.
The operating
system limits
external devices
connected by USB to
two tiers that can
include no more than
two hubs on the first
tier and no more
than one keyboard
and one pointing
device on the first or
second tier.
Reduce the number of
connected external USB
devices to no more than
two hubs on the first tier,
and no more than one
keyboard and one
pointing device on the
first or second tier.
External device
connected to USB
connector does not
work during startup
(before Windows 95
loads).
During startup, only
two tiers are
supported by the
USB port. These
tiers can include no
more than two hubs
on the first tier and
no more than one
keyboard and one
pointing device on
the first or second
tier.
Use the external device
only after Windows 95 or
Windows 98 has loaded.
Reduce the number of
connected external USB
devices to no more than
two hubs on the first tier,
and no more than one
keyboard and one
pointing device on the
first or second tier.
External devices in
lower tiers do not
work.
An unpowered hub is
connected to another
unpowered hub.
Use only powered hubs.
Make sure that all
unpowered hubs are
immediately preceded by
powered hubs in the USB
chain.