Introduction To Wlan Troubleshooting - Nokia RM-779 Service Manual

Test
Bluetooth Functional Test: BER test
with BT-Box or functional test with
other Bluetooth device
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 of Bluetooth and FM radio receiver and transmitter.
If Bob1.0M-b module has been replaced, the WLAN tuning must be performed to ensure that the
output complies with ETSI/ FCC legal limits.

Introduction to WLAN troubleshooting

The following problems can occur with the WLAN hardware:
Symptom
Unable to switch on WLAN on
phone user interface
Able to turn on WLAN via phone
user interface, but unable to
detect any WLAN APs or other
WLAN devices
Able to turn on WLAN via phone
user interface and find APs and
other WLAN devices, but not able
to connect
Slow download speed when
using WLAN as connection
method
Users may experience the following problems resulting in functional phones being returned to the repair
centre:
Symptom
WLAN does not operate as desired
with another WLAN device
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Test Coverage
Bluetooth antenna circuit
FM receiver antenna circuit
FM receiver audio circuit
Problem
Open circuit solder joints or
component failure of BOB
module
Open circuit solder joints or
component failure of BOB
module or filter
Problem with TX part of WLAN
circuit
System clock possibly degraded
Problem
Other WLAN device is not
conforming to ETSI/FCC
specifications
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BB Troubleshooting and Manual Tuning Guide
Repair of Bluetooth antenna
circuit (including RF filter or
WLAN switch if fitted)
Repair of FM antenna circuit
(between BTHFMWLAN ASIC
and headset connector)
Repair of FM receiver audio
circuit (between BTHFMWLAN
ASIC and headset connector)
Repair solution
Replacement of BOB module
or Host
Replacement of BOB module
or filter
Replacement of BOB module
Change system clock source
Repair solution
Use only certified WLAN
products
RM-779
Repair solution
Issue 1