Toshiba A100 VA3 - Satellite - Pentium Dual Core 1.6 GHz Maintenance Manual page 116

3.6 Keyboard Test
PRESS [Enter] KEY
Subtest 05 USB Port 1,2 test
This subtest checks USB. The USB TEST Module (ZD0003P01) and USB Cable
(ZD0003P02) must be connected to the computer.
The following message will appear. Select a port to be tested and press Enter.
Test port number select (1:Port1, 2:Port1, 0:Port1&2) ?
If the test ends successfully, OK is displayed. If nothing is displayed, there may be
a problem with the USB port. Check the wraparound connection and repeat the
test.
PORTEGE A100 Maintenance Manual (960-460)
3 Tests and Diagnostics
3-17