Nokia N900 Service Manual page 94

Symptom
Bluetooth feature does not
operate as desired with another
Bluetooth device
Poor FM radio reception (unable
to detect many radio stations)
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
Test
Blueooth Self Test: ST_LPRF_IF_TEST
Bluetooth Self Test:
ST_BT_WAKEUP_TEST
Bluetooth Self Test:
ST_LPRF_AUDIO_LINES_TEST
Bluetooth Functional Test: BER test
with BT-Box or functional test with
other Bluetooth device
FM Radio Self Test: ST_RADIO_TEST
FM Radio Functional Test: Perform
scan for local radio stations and
check station list displayed on
phone
FM Radio Functional Test: Listen to
local radio station
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.
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Problem
Bluetooth Profile implemented
in Bluetooth accessory not
supported in Nokia phone
Nokia headset not being used
Test Coverage
Bluetooth-FM ASIC UART interface
(controls Bluetooth and FM
receiver and transmitter)
Bluetooth ASIC interrupt control
interface
Bluetooth ASIC PCM interface
Bluetooth antenna circuit
FM Radio I2C interface
FM receiver antenna circuit
FM receiver audio circuit
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BB Troubleshooting
Repair solution
Use Bluetooth accessory with
Bluetooth profiles supported
by phone
Use Nokia headset
BT and FM Self Tests in Phoenix
Repair solution
Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Repair of Bluetooth antenna
circuit (including RF filter or
WLAN switch if fitted)
Replacement of Bluetooth/FM
ASIC (or repair of phone BB)
Repair of FM antenna circuit
(between BTHFM ASIC and
headset connector)
Repair of FM receiver audio
circuit (between BTHFM ASIC
and headset connector)
RX-51
Issue 1