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UI Module Troubleshooting PAMS Technical Documentation
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USB Detection
Malfunction
Is MP3/FM
working?
Go to MP3/FM
Troubleshooting section
Plug in USB cable
with PC turned on
Is
USB_DET_INT
voltage
correct?
Check R409, R410
NO
YES
YES
NO
YES
Does pin 22 of
U401has 6MHz clock
frequency?
Are
DVCC, CVCC,
AVCC turned
on?
Does pin 2
of U403 have
11.995MHz
frequency?
Check connection
between pin 2 of U403
and pin 4 of U102
Change U403
NOYES
NO YES
YES
NO
Is
USB_VCC
(U506) turned
on?
YESNO
Is pin3
of U301
(USB_ON) around
2.8V?
Check
USB_ON
connectivity
to U506
YES
NO
Change U506
3.1V regulator
Reprogram the
Nand Flash
Memory. USB
program could be
corrupted
Check
USB_DET_INT
line connection to
U301
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