Nokia 5510 Troubleshooting Manual page 81

PAMS Technical Documentation
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Check the
alignment of
domesheet
Ensure there is no
foreign particles on
the keypad
Check B2B
connector and U501
regulator output
voltage(2.8V)
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Keyboard/Hotkey
Malfunction
NO Side Keys
Malfunction?
Are VBAT, VBB
NO
and UC_VCC voltages
correct?
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UI Module Troubleshooting
YES
Check if SW753,
SW754, SW755, SW756
side keys are intact
Check if pull-down resistors
R701, R703, R704, R705,
and network resistor R702
are correct and properly
soldered
Check 32.768kHz
YES
crystal frequency and
MCU. Replace them
if necessary
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