Programmes After Market Services (PAMS)
Technical Documentation
NHB–3 Series Transceiver
Chapter 3
TRANSCEIVER
OVERVIEW
PAMS
Technical Documentation
CHAPTER 3 – TRANSCEIVER OVERVIEW
Contents
Transceiver 3–3
Introduction 3–3
Basic Construction 3–3
Interconnection Diagram 3–4
Functional Description 3–5
Circuit Description 3–5
Block Diagram 3–5
Power Distribution 3–6
Exploded View of NHB–3NB and NHB–3ND 3–7
Assembly Parts of NHB–3NB and NHB–3ND 3–8
NHB–3
Transceiver
Page No
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PAMS
Technical Documentation
Transceiver
Introduction
Basic Construction
There are 7 basic parts:
– electronics module (radio module + shields)
– UI Module (flex)
– A–cover with key mats
– B–cover
– window
– antenna
– battery pack
NHB–3
Transceiver
3C 0500225 expl. view of NHC–3XN
6E 0260349 ass. parts of NHC–3XN
3C 0500226 expl. view of NHC–3AA
6E 0260350 ass. parts of NHC–3AA
3C 0500227 expl. view of NHC–3XB
6E 0260351 ass. parts of NHC–3XB
Electronics Module
The Electronics module includes a 2–sided (components) pcb and 2 shielding
covers (metallized plastic and moulded magnesium shields). Screws (3 pcs)
and snaps are used for fixing the shields together.
UI Module
The UI module contains the following parts: electronics, mic with rubber cushion, earpiece with seals, buzzer with a seal, display, display driver, light guide,
reflector, UIM reader, metal dome keyboard, illumination LEDs and connections
to the Radio Module.
There are 2 versions of UI modules
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Technical Documentation
Interconnection Diagram
NHB–3
Transceiver
MIC
UIM
524
2
Display
UI MODULE
30
RADIO MODULE
16 2+2 1
SYSTEM
CONNECTOR
CHARGER ANTENNA
2
EARPIECE
2
BUZZER
4
BATTERY
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Technical Documentation
Functional Description
Circuit Description
The transceiver electronics consist of the Radio Module (RF + System blocks)
and the UIF Module. The UIF Module is connected to the Radio Module with a
connector. System blocks and RF blocks are interconnected with PCB wiring.
The Transceiver is connected to accessories via a bottom system connector
with charging and accessory control.
The System blocks provide the MCU and DSP environments, Logic control IC
(D2CA), memories, audio processing and RF control hardware (RFI). On board
power supply circuitry delivers operating voltages for both System and RF
blocks.
The general purpose microcontroller, Hitachi H8, communicates with the DSP,
memories and Logic control IC (D2CA) with an 8–bit data bus.
The RF block is designed for a handportable phone which operates in the
DCS1900 system. The purpose of the RF block is to receive and demodulate
the radio frequency signal from the base station and to transmit a modulated
RF signal to the base station.
NHB–3
Transceiver
Block Diagram
DUPLEX
FILTER
RF BLOCK
RX
RX
SYNTE
SYNTE
TX
TX
IF 13 M
Clk 26 M
AFC
TXI,TXQ
TXC
RF CONTROL
RFI
Clk
13 M
SYSTEM BLOCK
UIF
SYSTEM
ASIC
D2CA
Clk
26 M
UIM
MCU
DBUS
DSP
Clk 512 k, Clk 8 k
M2BUS
AUDIO
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Technical Documentation
Power Distribution
The power supply is based on the ASIC circuit PSL+ for a baseband circuitry
and on CRFCONT for RF. PSL+ consists of regulators and control circuits providing functions like power up, reset and watchdog. External buffering is required to provide more current. CRFCONT consists of eight separate regulators.
The MCU and the PSL+ circuits control charging together, detection being carried out by the PSL+ and higher level intelligent control by the MCU. The MCU
measures battery and charger voltages as well as the temperature and size of
the battery by means of the MCU internal ADC to sense the condition of the
battery.
Detailed power distribution diagrams appear in Baseband block and RF block
documents.
NHB–3
Transceiver
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Technical Documentation
Exploded View of NHB–3NB
NHB–3
Transceiver
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Technical Documentation
NHB–3
Transceiver
Assembly Parts of NHB–3NB
ITEM Q’TY CODE DESCRIPTION VALUE, TYPE
1 9450269 A cover 2D 24116 (NHB–3NB)
1 9457376 A cover 2C 26240
2 9457079 Window 3C 23086 (Nokia 2190)
5 9790055 Sidekeymat 3D 22995
6 9790062 Power keymat 4C 23396
7 9790154 Keypad 4C 25878
8 9450656 A shield 1D 26104
9 9510299 B shield 1D 24198 B
10 9380115 Continuous sheet
12 6 6291662 PT screw 1.8x8 FeZn TX6
13 9450434 B cover 1D 24212
14 6 6290060 PT screw M2x5–BT ZNB TORX6
15 9450230 SIM cover 3D 23018
16 0660111 Antenna JTI/PCS1850–1990 MHz
17 9510286 Edge clip 4D 26101
T1 0200819 UIF module DU8C
T2 0200943 System module DB6
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Technical Documentation
NHB–3
Transceiver
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