User Guide

RH-37
System Module Nokia Customer Care
Page 24 Nokia Corporation Issue 1 07/04
Block diagram of IHF.
For RH-37, the Integrated Hands Free Speaker is used to generate hands free speech, and
also polyphonic ringing tones. The speaker capsule is mounted into the A Cover, and
spring contacts are used to connect the IHF Speaker contacts to the PWB.
The IHF is furthermore used to generate alerting and warning tones.
External audio
RH-37 is designed to support a fully differential external audio accessory connection. A
headset can be directly connected to the PopPort
TM
system connector. Stereo audio is
not supported by RH-37. A stereo headset can be connected to RH-37, since left and
right paths are connected in parallel at the PopPort
TM
connector.
External microphone connection
The external microphone input is fully differential and lines are connected to the UEMEK
microphone input MIC2P/N. The UEMEK (MICB2) provides bias voltage. Microphone
input lines are ESD protected.
Headset connections
Headset implementation uses separate microphone and earpiece signals. The accessory is
detected by the ACI signal when the plug is inserted.
Test possibilities
Phoenix audio test
For troubleshooting see Audio faults in Baseband Troubleshooting Instructions.
Camera
RH-37 incudes a VGA camera module. The camera supports a video preview mode, with
integrated colour processing, and high quality still image mode, which utilizes the exist-
ing memory and the processing resources of the phone.