Acoustics Troubleshooting; Introduction To Acoustics Troubleshooting - Nokia RM-555 Service Manual

RM-555
BB Troubleshooting and Manual Tuning Guide

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 includes three basic systems: earpiece,
Integrated Hands Free (IHF) and microphone.
The sound reproduced from the earpiece radiates through a single hole on the front cover (A-cover). The
sound reproduced from the IHF speakers radiate through dual sound holes located at the top and bottom of
the phone. The microphone is located around the 'space' key in the keymat of the phone.
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.
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