Nokia 2190 Service Manual Trans
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
Original 26/97
Page 3–2
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
Original 26/97
Page 3–3
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