Troubleshooting Guide
BTHFMTXRDS3.0b Troubleshooting Guide Description
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)
Symptom, Problem and Repair Solution
The following problems can occur with the Bluetooth and FM radio hardware:
Symptom Problem Repair Solution
Unable to switch on Bluetooth on
phone user interface
Open circuit solder joints or
component failure of BTH/FM
ASIC/module BB ASICs or SMD
components.
Replacement of Bluetooth/FM
ASIC/module
RM-497
BTHFMTXRDS3.0b
Issue 1 COMPANY CONFIDENTIAL Page 6 – 5
Copyright © 2010 Nokia. All rights reserved.
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