JHL90 Service Manual
To determine if the computer’s external USB devices are functioning properly
perform the following procedures. Figure 6-5 outlines the process. Start with
Procedure 1 and continu
,
e as instructed.
nection check
nection check
Make sure USB device cable is firmly plugged into one of the USB sockets.
• If the cable is connected correctly, go to Check 2.
SB device into another USB socket (there are three in all).
ected to another USB port, go to
3.
the system board of the
computer.
oard may be damaged. Go to
one of the computer’s USB ports, and then
etects the external device.
ay be
alternative USB device appears to have the same problem as the original
o to Procedure 2.
6.2 Procedure 2
• Procedure 1: External device and con
• Procedure 2: Replace system board
6.1 Procedure 1 External device and con
The USB device may be damaged or the connection may be faulty. Perform
Check 1.
Check 1
Check 2
Plug the U
• If the USB device still does not work, go to Check 4.
• If the device functions correctly when conn
Check
Check 3
Make sure that the USB socket is firmly secured to
• If the malfunction remains, the system b
Procedure 2.
Check 4
Connect an alternative USB device to
boot the computer. The computer automatically d
• If the alternative USB device works correctly, the original device m
damaged and should be replaced.
• If the
device, the system board may be damaged. G
Replace system board
If the error persists, the system board may be damaged.
6-16
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