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Troubleshooting
3.5 Troubleshooting
This section covers some of the possible difficulties that might be encountered
with platform operation.
The platform is connected to an external power source for V CC and a
voltage regulator EVM is installed in U6. Neither LED is lit and the EVM
modules are not receiving power.
Check that platform power switch S1 is set on ON
Check that JP1 or JP2 or JP3 is jumpered and corresponds to the
power source
Check fuse F1; replace it if it is found to be open
Check platform power switch S1; replace it if it is found to be faulty
The platform is connected to an external power source for V CC and a
voltage regulator EVM is installed in U6. Only LED1 (V CC ) is lit. There is
no V DD at JP5 and the installed EVMs do not function properly.
Check that the voltage regulator EVM is fully seated in socket U6 and
that none of the pins are bent over
Substitute a known-good voltage regulator EVM for the module in U6
The platform is connected to an external power source for V DD at J6. LED2
(V DD ) is dark and V DD is not reaching the EVMs.
Check for correct V DD input supply voltage
Check fuse F2; replace it if it is found to be open
Power amplifier EVMs installed in U2, U3, and/or U4 are powered correct-
ly but produce no sound.
Consult the User ’s Guide for the installed power amplifier and
determine 1) if the EVM is mute active-high or mute active-low, and 2)
which pin on the module is the mute control input. Measure the voltage
at the mute control input pin of the installed module with no plug
inserted in headphone jack J10. If the EVM is mute active-high and the
mute pin of the EVM measures V DD , the EVM is being held in the mute
mode. Jumper the other pin on JP8 to reverse the mute control line
polarity.
The power amplifier EVM installed in U5 is powered correctly, but there is
no sound from headphones when plugged into headphone jack J10.
Check that the headphone jack source select switch (S3) is set to the
U5 position
Consult the User ’s Guide for the installed power amplifier and
determine 1) if the EVM is mute active-high or mute active-low, and 2)
which pin on the module is the mute control input. Measure the voltage
at the mute control input pin of the installed module with the
headphone plug inserted in jack J10. If the EVM is mute active-high
and the mute pin of the EVM measures V DD , the EVM is being held in
the mute mode. Jumper the other pin on JP7 to reverse the mute
control line polarity.
Details
3-13
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