Nokia NHL-4 7210 Service Manual page 185

CCS Technical Documentation
External Accessory Regulator................................................................................. 34
External Audio ...........................................................................................................34
External Microphone Connection ........................................................................... 34
External Earphone Connections .............................................................................. 35
Internal Audio ............................................................................................................36
IHF Speaker & Stereo Audio Amplifier ................................................................. 36
Internal Microphone................................................................................................ 36
Internal Speaker....................................................................................................... 36
IHF Speaker & Stereo Audio Amplifier ................................................................. 37
Memory Block ...........................................................................................................38
Security.................................................................................................................... 38
Clock distribution ......................................................................................................38
Audio Control.......................................................................................................... 39
Accessory identification and Power Supply............................................................ 39
Backup Battery........................................................................................................ 40
RF Module Introduction............................................................................................... 41
RF Frequency Plan ....................................................................................................42
DC characteristics ......................................................................................................43
Regulators................................................................................................................ 43
Typical current consumption................................................................................... 44
Power Distribution .................................................................................................. 45
RF characteristics ......................................................................................................... 46
Channel Numbers and Frequencies......................................................................... 46
Main RF characteristics........................................................................................... 46
Transmitter characteristics ...................................................................................... 46
Receiver characteristics........................................................................................... 47
RF Block Diagram .................................................................................................. 47
RF Block Diagram NHL-4...................................................................................... 48
Frequency Synthesizers .............................................................................................49
Receiver .....................................................................................................................49
Transmitter .................................................................................................................49
Front End................................................................................................................. 49
Power Amplifier...................................................................................................... 50
RF ASIC Helga ....................................................................................................... 51
AFC function........................................................................................................... 51
Antenna .................................................................................................................. 51
User Interface Modules ................................................................................................ 52
UI Board TK4 ............................................................................................................52
Keyboard ................................................................................................................. 52
Display .................................................................................................................... 53
LCD & Keypad Illumination................................................................................... 54
Internal Speaker....................................................................................................... 54
Buzzer...................................................................................................................... 54
Internal Microphone................................................................................................ 54
IR Module ..................................................................................................................55
Vibra ..........................................................................................................................55
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