Nokia 2146 Contents of Transceiver 07
TRANSCEIVER
NHK–4
06/97JR
Technical Documentation
Contents of Transceiver
Transceiver NHK–4 7–2
Introduction 7–2
Functional Description 7–2
Interconnection Diagram 7–3
Exploded View of NHK–4NX (Nokia 2140) 7–4
Assembly Parts of NHK–4NX 7–5
Exploded View of NHK–4NY, –4BT, –4RY (Nokia 2148) 7–6
Assembly Parts of NHK–4NY, –4BT, –4RY 7–7
Exploded View of NHK–4AX (Nokia 2142) 7–8
Assembly Parts of NHK–4AX 7–9
Exploded View of NHK–4BX, –4PT (Nokia 2146) 7–10
Assembly Parts of NHK–4BX, –4PT 7–11
7–1
Copyright Nokia Mobile Phones
TRANSCEIVER
NHK–4
Transceiver NHK–4
Introduction
The NHK–4 is a radio transceiver unit for the PCN network. It is PCN power
class 1 transceiver providing 11 power levels at a maximum power of 1 W.
The transceiver consists of three modules: system module, user interface module and mechanics.
The plug–in SIM (Subscriber Identity Module) card reader is located inside the
phone.
Functional Description
The transceiver electronics consist of radio module (system + RF blocks) and
UIF module. UIF module is connected to radio module with a connector. System blocks and RF blocks are interconnected with PCB wirings. Transceiver
can be connected to accessories with a bottom system connector, which includes charging and accessory control.
06/97JR
Technical Documentation
7–2
Copyright Nokia Mobile Phones
The system blocks provides MCU and DSP environments, logic control IC
(D2CA), memories, audio processing and RF control hardware (RFI). On board
power supply circuitry delivers operating voltage for both system and RF
blocks.
The micro controller unit (MCU), Hitachi H8/536, communicates with DSP, memories and logic control IC (D2CA) with 8 bit data bus.
RF block is designed for a handportable phone; which operates in GSM system. Purpose of the RF block is to receive and demodulate radio frequency signal from the base station and to transmit a modulated RF signal to the base
station.
TRANSCEIVER
NHK–4
06/97JR
Technical Documentation
Interconnection Diagram
SIM Display
524
2
MIC
UI – MODULE
7–3
Copyright Nokia Mobile Phones
2
EARPIECE
2
BUZZER
RADIO – MODULE
16 2+2 2
SYSTEM
CONNECTOR
30
4
BATTERY
CHARGER ANTENNA
TRANSCEIVER
NHK–4
06/97JR
Technical Documentation
Exploded View of NHK–4NX (Nokia 2140)
7–4
Copyright Nokia Mobile Phones
Loading...