Troubleshooting Guide; Bthfmtxrds3.0B Troubleshooting Guide Description; Symptom, Problem And Repair Solution - Nokia RM-497 Service Manual

Table of Contents

RM-497

BTHFMTXRDS3.0b

Troubleshooting Guide

Introduction

The Bluetooth and FM radio receiver and transmitter are combined in the same ASIC, so these features are

all checked when troubleshooting (if supported). If the phone does not support the FM transmitter feature

there will be no FM TX discrete components or antenna.

Component Placement

The placement of Bluetooth and FM components and test probe points is shown below.

The Bluetooth antenna is product specific (PWB track, SMD antenna, clip on antenna, or antenna integrated

into phone covers) and is typically located near the side of the PWB.

The FM receiver RF signal is routed through a product specific FM antenna matching circuit to the phone

headset connector. Typically, the FM receiver antenna matching circuit is located near to the phone headset

connector. The FM receiver audio signal is routed to the headset connector through the BB ASIC shared by

the phone audio functions.

Figure 55 Test points in Bluetooth-FM ASIC circuit – BTHFMTXRDS3.0b (TI BL6450)

The following problems can occur with the Bluetooth and FM radio hardware:

Symptom

Unable to switch on Bluetooth on

phone user interface

Issue 1

Problem

Open circuit solder joints or

component failure of BTH/FM

ASIC/module BB ASICs or SMD

components.

COMPANY CONFIDENTIAL

Repair Solution

Replacement of Bluetooth/FM

ASIC/module

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