Nokia 5510 - Page 83

PAMS Technical Documentation UI Module Troubleshooting
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FMR Malfunction
Is
MP3 functioning
OK?
Go to MP3
Troubleshooting
section.
NO
Change U504
Check if
75kHz (Y801) crystal
frequency is
correct
Change crystal
YES
NO
NO
YES
Check if
there is analog
signals at pin5 and
pin14 of U602
Check if there is
analog signals at pin13
and pin3 of U602
Check connectivity
at L601, L602,
R613, R614,
C609,C610 and
J602
YES
YES
YES
NO
NO
Check if
FMR_VCC(U504)
voltage is
correct
Change U602
FMR Manual
Tuning Malfunction
Check C815
voltage
If C815 voltage is
not correct,
VR801, D801 or
D802 is defective
Are pin 9 and
pin 10 of U602
voltages correct?
Check MCU
NO
YES
Ensure C633 is
properly soldered