JHL90 Service Manual
To determine if the computer’s built-in speakers are functioning properly,
perform the following procedures. Figure 6-9 outlines the process. First adjust the
speaker volume to an appropriate level. Start with Procedure 1 and continue as
instructed.
• Procedure 1: Audio source test
• Procedure 2: Earphone test
k
eck
10.1
and digital music file) to determine
10.2
se function correctly, go to
k
ures
e
re still not functioning properly, go to Procedure 4.
eck
• Procedure 3: Connection chec
• Procedure 4: Replacement ch
Procedure 1 Audio source test
Try different audio sources (e.g. an audio CD
whether the fault is in the speaker system or not. If not all sources have sound
problems, the problem is in the source devices. If all have the same problem,
continue with Procedure 2.
Procedure 2 Earphone test
Connect a set if earphones or external speakers. If the
Procedure 3. If they do not function correctly, the system board may be defective
or damaged. Replace it with a new one.
10.3 Procedure 3 Connection chec
Disassemble the computer following the steps described Replacement Proced
and make sure the speaker cable is firmly connected to the system board. If th
stereo speakers a
10.4 Procedure 4 Replacement Ch
If the stereo speakers don’t sound properly, the stereo speakers may be defective
or damaged. Replace them with new ones. If the stereo speakers still do not work
properly.
6-24
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