External Earphone Connections; Internal Audio; Internal Microphone - Nokia NSB-9 Service Manual

NSB-9
System Module and User Interface

External Earphone Connections

Internal Audio

Internal Microphone

The internal microphone module and holder is mounted into the B-cover. Microphone is
omni directional. The internal microphone is connected to the UEM microphone input
MIC1P/N. The microphone input is asymmetric and microphone bias is provided by the
UEM MIC1B. The microphone input on the UEM is ESD protected. Spring contacts are
used to connect the microphone contacts to the main PWB.
UEM
MIC1P
MIC1N
MICB1
Page 40
Figure 12: System connector
Figure 13: Internal microphone connections
2x33nF 2x2k2
4u7
100nF
Nokia Corporation
CCS Technical Documentation
600 Ω Ω Ω Ω @100MHz
2k2
Issue 1 04/03