![Compaq Armada 7800 6266 T 5000 D 0 1 Скачать руководство пользователя страница 64](http://html.mh-extra.com/html/compaq/armada-7800-6266-t-5000-d-0-1/armada-7800-6266-t-5000-d-0-1_maintenance-and-service-manual_2645536064.webp)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-38
Troubleshooting
Solving USB Problems
Table 2-29
Solving USB Problems
Problem
Probable Cause
Recommended Action(s)
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 a
USB connector does not work
during startup (before
Windows 95 loads).
During startup, only two tiers
are supported by the USB
connector. 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 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.