Nokia 5510 Troubleshooting Manual page 83

PAMS Technical Documentation
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FMR Malfunction
Is
MP3 functioning
OK?
YES
Check if
FMR_VCC(U504)
voltage is
correct
YES
Ensure C633 is
properly soldered
Check if
75kHz (Y801) crystal
frequency is
correct
YES
Check if
there is analog
signals at pin5 and
pin14 of U602
YES
Check if there is
analog signals at pin13
and pin3 of U602
YES
Check connectivity
at L601, L602,
R613, R614,
C609,C610 and
J602
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Go to MP3
NO
Troubleshooting
section.
NO
Change U504
NO
Change crystal
NO
NO
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UI Module Troubleshooting
Are pin 9 and
YES
pin 10 of U602
voltages correct?
NO
Check MCU
NPM-5
FMR Manual
Tuning Malfunction
Check C815
voltage
If C815 voltage is
not correct,
VR801, D801 or
D802 is defective
Change U602
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