Nokia 6610i Service Manual
CCS Technical Documentation
7-System Module and User Interface
Company confidential
RM-37
Issue 1 04/2004
©Nokia Corporation.
Page 37
Internal Audio
IHF Speaker & Stereo Audio Amplifier
Integrated Hands Free Speaker, 16mm MALT, is used to generate speech audio, alerting
and warning tones in RM-37. Audio amplifier is controlled by the UPP. Speaker capsule is
mounted in the C-cover. Spring contacts are used to connect the IHF Speaker contacts to
the main PWB.
and warning tones in RM-37. Audio amplifier is controlled by the UPP. Speaker capsule is
mounted in the C-cover. Spring contacts are used to connect the IHF Speaker contacts to
the main PWB.
Figure 11: IHF speaker and amplifier
Internal Microphone
The internal microphone capsule is mounted to in the UI-frame. The microphone is omni-
directional and it’s connected to the UEM microphone input MIC1P/N. The microphone
input is asymmetric and the UEM (MICB1) provides bias voltage. The microphone input
on the UEM is ESD protected. Spring contacts are used to connect the microphone to the
mainPWB.
directional and it’s connected to the UEM microphone input MIC1P/N. The microphone
input is asymmetric and the UEM (MICB1) provides bias voltage. The microphone input
on the UEM is ESD protected. Spring contacts are used to connect the microphone to the
mainPWB.
Figure 12: Internal microphone
Internal Speaker
The internal earpiece is a dynamic earpiece with impedance of 32 ohms. The earpiece
must be low impedance one since the sound pressure is to be generated using current
and not voltage as the supply voltage is restricted to 2.7V. The earpiece is driven directly
must be low impedance one since the sound pressure is to be generated using current
and not voltage as the supply voltage is restricted to 2.7V. The earpiece is driven directly
IHF speaker
2 x var 14V
2x 22p
1k
Ω @ 100MHz
Stereo
audio
Amplifier
audio
Amplifier
UEM
FM
radio
radio
XEAR
Stereo Audio
UPP
Control
Interface
Interface
VBAT