Internal Microphone Troubleshooting; Acoustics Troubleshooting; Introduction To Acoustics Troubleshooting - Nokia RM-627 Service Manual

RM-627
BB Troubleshooting and Manual Tuning Guide

Internal microphone troubleshooting

Troubleshooting flow

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,
integrated handsfree (IHF) and microphone.
The sound reproduced from the earpiece eradiates through a single hole on the front cover (A-cover). The
sound reproduced from the IHF speaker radiates from the sound hole located on the bottom of the phone.
The inlet for the microphone is found on the edge of the QWERTY keymat next to Q and A.
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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