Symptom Problem Repair solution
Able to perform scans to detect
local FM radio stations with
functional Nokia headset
inserted, but unable to hear FM
audio through headset
Open circuit solder joints or
detached component in FM
audio path between Bluetooth/
FM ASIC and headset
Repair of FM audio circuit
Users may experience the following problems resulting in functional phones being returned to the repair
centre:
Symptom Problem Repair solution
Bluetooth feature does not
operate as desired with another
Bluetooth device
Bluetooth Profile implemented
in Bluetooth accessory not
supported in Nokia phone
Use Bluetooth accessory with
Bluetooth profiles supported
by phone
Poor FM radio reception (unable
to detect many radio stations)
Nokia headset not being used Use Nokia headset
Test coverage
The tests listed in the table below should be performed to verify whether the Bluetooth and FM receiver and
transmitter are functional. The use of Self Tests are described in section
BT and FM Self Tests in Phoenix
Test Test Coverage Repair solution
Blueooth Self Test: ST_LPRF_IF_TEST Bluetooth-FM ASIC UART interface
(controls Bluetooth and FM
receiver and transmitter)
Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Bluetooth Self Test:
ST_BT_WAKEUP_TEST
Bluetooth ASIC interrupt control
interface
Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Bluetooth Self Test:
ST_LPRF_AUDIO_LINES_TEST
Bluetooth ASIC PCM interface Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Bluetooth Functional Test: BER test
with BT-Box or functional test with
other Bluetooth device
Bluetooth antenna circuit Repair of Bluetooth antenna
circuit (including RF filter or
WLAN switch if fitted)
FM Radio Self Test: ST_RADIO_TEST FM Radio I2C interface Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
FM Radio Functional Test: Perform
scan for local radio stations and
check station list displayed on
phone
FM receiver antenna circuit Repair of FM antenna circuit
(between BTHFM ASIC and
headset connector)
FM Radio Functional Test: Listen to
local radio station
FM receiver audio circuit Repair of FM receiver audio
circuit (between BTHFM ASIC
and headset connector)
The self tests run from Phoenix software are used for fault diagnosis.
If Phoenix software is not available the functional tests with phone accessories are sufficient to verify the
functionality Bluetooth and FM radio receiver and transmitter.
RM-484; RM-485; RM-486
BB Troubleshooting
Page 3 –54 COMPANY CONFIDENTIAL Issue 1
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