User Guide

RH-12/RH-28
Baseband Troubleshooting Instructions CCS Technical Documentation
Page 32 Nokia Corporation Issue 1 02/04
Downlink noise in audio signal
Loose speaker or
other component
inside telephone
Start
Music Player
Is noise
electrical or
mechanical?
Bad music file
Defective FM
module
Electrical
Mechanical
Is noise
associated with
FM tuner or with
Music Player?
Is noise
associated with
accessory?
Defective
accessory. Repair
or Replace
accessory
Yes
No
FM radio
Is noise
associated with
earpiece/IHF
(hand portable
mode)?
Yes
Defective
speaker.
Does error
occur both in
earpiece and
IHF?
Software error.
Defective or badly
tuned antenna.
No
No
Yes