User Guide

CCS Technical Documentation System Module and User Interface
NSB-9
Issue 1 04/03 Nokia Corporation Page 29
FM-radio audio connections
FM-radio audio output signals are fed to stereo audio amplifier Rin and Lin inputs and
UEM microphone input MIC3. Amplification of the audio signal is made by the audio cir-
cuitry inside the UEM (IHF mode) and stereo audio amplifier. In IHF mode the left audio
signal is looped internally in UEM from MIC input to XEAR output, which is connected to
stereo audio amplifier Phone input (Phone InHS and Phone InIHF). Amplified audio signal
is fed to IHF speaker or headset, which is also used as an antenna input for the radio. FM
radio audio output is muted during the search operation.
Figure 4: FM radio audio and antenna connections
Keyboards
NSB-9 keyboard consists of engine keyboard and separate FLIP keyboard. Flip module is
connected to main PWB through 4pcs 2-pole pogo pin connectors. Flip position detec-
tion is implemented with HALL sensor switch. The switch is connected to UEM KEYB1 A/
D channel. Magnet is located inside the flip. According to the position detection, parts of
flip keyboards are enabled/disabled.
Engine Keyboard
6x6 matrix keyboard is used in engine side. Key pressing is detected by scanning proce-
dure. Keypad signals are connected UPP keyboard interface. Side keys are included to
matrix. Engine shift key is connected to UPP GenI/O19. Power key is working as the third
SW key when flip is open.
System
Connector
UEM
TEA5767
600Ω
600Ω600Ω
600Ω
@100MHz
Stereo
Amplifier
VAFL
VAFR Rin
Lout
Rout
RFin
IHF
HSEAR P
HSEAR N
HSEAR R P
HSEAR R N
MIC3
XEAR
Phone_in
Lin
SPKRout +
SPKRout -
Phone_in
IHF
HS