Acoustics Troubleshooting; Introduction To Acoustics Troubleshooting - Nokia RM-529 Service Manual

RM-529; RM-530; RM-584
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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 these basic systems: earpiece,
integrated handsfree (IHF), EANC error microphone, EANC reference microphone and two digital uplink
microphones.
The sound reproduced from the earpiece readiates through a single hole on the front cover (A-cover). The
sound reproduced from the IHF speaker radiates from the sound holes located on the bottom part of the
back cover. The EANC error microphone is located in the opening in the front of the earpiece. The reference
microphone is located at the bottom side and its sound hole is near the camera. The uplink microphones are
located on the top side of the PWB. The sound hole of the primary microphone is in the bottom, left corner.
The sound hole of the secondary microphone is in the keyboard near the Q-key.
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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