Troubleshooting
No Sound Coming from the Headphone Jack
Embedded Touch Screens
Verify that your
headphones are working
by plugging them into a
known good device or
unit.
Are
headphones
good?
Yes
Ensure the volume is high
enough to be heard by
using the increase volume
button on the keypad or by
using the touch screen.
Does indicator on
the screen
increase?
No
No
Replace the keypad or
calibrate the touch screen
Yes
Find working
headphones and
continue.
Is sound
coming from
the jack?
Yes
Problem Resolved
No
Check cable
connections
between the CCB
and touch screen.
No
Follow
instructions in
Check
Sound from
the CCB
Is sound
coming from
CCB?
Verify that there is
sound coming
directly from the
CCB.
Yes
Follow instructions in
Checking CCB to
Screen Cable
Follow
instructions in
Test the
Audio Cable
Test the audio
cable.
Are the cables
good?
No
Is sound
coming from
the CCB?
No
Yes
Reconnect the
audio cable to the
CCB and plug
headphones back
into the jack.
No
Is sound
coming from
the jack?
Replace the audio
cables and test.
Replace the
headphone jack.
Yes
Problem Resolved
Replace the
interface board.
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Yes
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Yes
Is sound
coming from
the jack?
No
637-1424 Rev: A
Troubleshooting
Check Sound from the CCB
1. Remove the bottom cover of the display head (Fig. 1). Disconnect the audio cable from the CCB (Fig. 2).
Fig. 2
Fig. 1
2. Connect the headphones directly to the CCB (Fig. 3).
Fig. 3
3. Return to the flow chart.
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637-1424 Rev: A
Troubleshooting
Checking the CCB to Screen Cable
1. Disconnect the AV cable from the JP3 on the CCB (Fig. 4) and JP5 on the touch screen (Fig. 5).
Fig. 5
Fig. 4
2. Using a multi-meter, do a continuity test on all the wires (Fig. 6)
• If there is no continuity on any of the wires, replace the cable.
Fig. 6
3. Plug the cable back in to the CCB and interface board. Be sure that both cables are plugged in properly.
4. Return to the flowchart.
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637-1424 Rev: A
Troubleshooting
Test the Audio Cable
Using a multi meter, do the following continuity checks on each stereo jack on the audio cable.
1. Check for continuity on the tips of the stereo jack (Fig. 7 & 8).
Fig. 7
Fig. 8
2. Check for continuity between the rings of the stereo jack (Fig. 9 & 10).
Fig. 10
Fig. 9
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637-1424 Rev: A
Troubleshooting
3. Check for continuity above the rings of the stereo jack (Fig. 11 & 12).
Fig. 12
Fig. 11
4. If there is no continuity between any of those sets of wires, replace the audio cable.
5. Return to the flowchart.
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637-1424 Rev: A