Acoustics troubleshooting
Introduction to acoustics troubleshooting
Acoustics design ensures that the sound is detected correctly with a microphone and properly radiated to
the outside of the device by the speaker. The acoustics of the phone include three basic systems: earpiece,
mono integrated handsfree speaker (IHF) and two digital microphones (primary and secondary).
The sound reproduced from the earpiece comes through a hole on the front cover window. The IHF sound
hole is located on the back of the phone, near the bottom area. The primary microphone sound hole is on
the front side below the home key. The secondary microphone sound hole is on the backside, close to the
IHF outlet hole.
For a correct functionality of the phone, all sound holes must be always open. When the phone is used, care
must be taken not to close any of those holes with a hand or fingers. The phone should be dry and clean,
and no objects must be located in such a way that they close any of the holes.
RM-779
BB Troubleshooting and Manual Tuning Guide
Issue 1
COMPANY CONFIDENTIAL
Page 3 – 37
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