JHL90 Service Manual
To determine if the computer’s keyboard is functioning properly, perform the
following procedures. Figure 6-5 outlines the process. Start with Procedure 1 a
continue with the other procedures as ins
nd
tructed.
5.1
USB keyboard to one of the computer’s keyboard/mouse ports, then
boot the computer The computer automatically detects the external keyboard.
ons
rnal keyboard appears to have the same problem as the internal
the system board may be damaged.
5.2
st.
f e
pro
is located, go to Procedure 3. If an error does not occur, the keyboard
5.3
The keyboard and/or system board may be disconnected or damaged.
ent Procedures and perform the following checks.
• .
h
The keyboard may be damaged.
stil
The system board may be damaged. Replace it with a new one.
• Procedure 1: External keyboard check
• Procedure 2: Diagnostic check
• Procedure 3: Connector and replacement check
Procedure 1 External keyboard check
Connect a
If the external keyboard works correctly, the internal keyboard or its connecti
may be faulty. Go to Procedure 2.
If the exte
keyboard,
Procedure 2 Diagnostic test
Run the Diagnostic Program, which will automatically execute the Keyboard Te
Re er to Chapter 3, Tests and Diagnostics for more information on how to run th
gram.
If an error
is functioning properly.
Procedure 3 Connector and replacement check
Replacem
Check 1
Make sure the keyboard cable is firmly connected to the system board.
• If the connection is loose, reconnect firmly and repeat Procedure 2.
If there is still an error, go to Check 2
C eck 2
• If the problem l exists, perform Check 3.
Check 3
6-14
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