Nokia 2160 Service Manual transcr

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TRANSCEIVER

NHC–4

11/97JR Technical Documentation

Contents of Transceiver

Transceiver 7–2 Introduction 7–2 Technical Specifictions 7–4 Modes of Operation 7–4 Control Channel Operation 7–4 Exploded View of NHC–4NX, –4HX, –4NE, –4EE and –4NV 7–5 Assembly Parts of NHC–4NX, –4HX, –4NE and –4NV 7–6 Exploded View of NHC–4NB and NHC–4HB 7–7 Assembly Parts of NHC–4NB and NHC–4HB 7–8

7–1

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TRANSCEIVER

NHC–4

Transceiver

Introduction

11/97JR Technical Documentation

3C 0500397 expl. view of NHC–4NX/HX/NE/NV 3C 0500398 expl. view of NHC–4NB/HB 6E 0260659 ass. parts of NHC–4NX/HX/NE/NV 6E 0260871 ass. parts of NHC–4NB/HB

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

7–2

The NHC–4 is a dual mode handportable Cellular phone for North American dual mode TDMA system. Reference for specifications are IS–55A ”Recommended Minimum Performance Standards for 800 MHz Dual–Mode Mobile Stations” and IS–54B ”Dual–mode Mobile station – Base station Compatibility Standard”, RSS128 ”800 MHz Dual–Mode Cellular Radiotelephones” and ”CTIA Certification program”.

NHC–4 offers analog mode and digital mode full rate speech services defined in IS–55A and analog mode asynchronous data services. It provides nine transmission power levels in digital mode and six in analog mode at a maximum power level of 0.6 W +2/–4 dB in power class IV. The transceiver has a retractable antenna and a connector for external antenna. User communicates with phone via LCD–display, keybord and some audible tones.

NHC–4 can be connected to different accessories e.g. chargers, holders, hands–free units, data–adapters and handset through the bottom system connector. NHC–4 can also be connected to a RF booster, which increases transmit power to full mobile power level class I. NHC–4 supports three different battery options: NiCd standard and NiMH high capacity and slim battery.

The transceiver consist of four modules: UIF module, system module, battery pack and mechanics.

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TRANSCEIVER

NHC–4

BATTERY

PACK

11/97JR Technical Documentation

SYSTEM / RF MODULE

UIF MODULE

LCD

KEYBOARD

7–3

TO/FROM ACCESSORIES CHARGER EXT. ANTENNA

MICROPHONE EARPIECE BUZZER

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TRANSCEIVER

NHC–4

11/97JR Technical Documentation

Technical Specifictions

Modes of Operation

NHC–4 operates in three modes:

1. In AMPS mode it operates in analog control and traffic channel

2. In digital mode in digital traffic channel

3. Test mode, which is used by Production and After Sales.

Control Channel Operation

In normal standby the terminal receiver, UHF frequency synthesizer and MCU are powerd on continously and the receiver is monitoring the incoming signal constantly. DSPs and MCU are in clock stop sleep. MCU is woken up every

46.3 ms by the RX modem. In extended standby the terminal receiver and UHF frequency sythesizer are

powered on only for the time of incoming data bit and frame synchronization and for the time of the first data repeat. DSP and MCU are in clock stop sleep. MCU is woken up and DSP and MCU clocks are switched on twice every 46.3 ms by the RX modem. If the parity check of the first repeat of the incoming data is correct, MCU and RF receiver and sythesizer are powered down untill the next interrupt. If the parity check shows errors, the extended stanby mode is disrupted and normal standby mode is resumed until several correct consecutive frames have been received.

7–4

Out of range operation (OOR) is used, when terminal fails to syncronize to any control channel after 15 s of scanning. During the scan the terminal receiver, UHF frequency sythesizer and MCU are powerd and clocked as in normal standby and in sleep they are power down like in extended standby. After being 40 s in the OOR mode the terminal scans control channels for 2.6 s. If synchronization is aquired then stanby mode and SERV are resumed. if no synchronization is found, then the terminal goes to OOR state for another 40 s etc. If any button of the terminal user interface is pressed during OOR mode, the terminal performs a rescan. OOR mode is not entered, when the terminal is connected to any charging device.

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NHC–4

11/97JR Technical Documentation

Exploded View of NHC–4NX, –4HX, –4NE, –4EE and –4NV

7–5

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NHC–4

11/97JR Technical Documentation

7–6

Assembly Parts of NHC–4NX, –4HX, –4NE, –4EE and –4NV

ITEM Q’TY CODE DESCRIPTION VALUE, TYPE

1 9450265 Front cover 2D 23953 2 9457268 Window 3C 25790 5 9790055 Side keymat 3D 22995 6 9790062 Power keypad 4C 23396 7 9790149 Keypad 3C 25789 8 9460152 A–shield 1D 24508 9 9540009 B–shield 0D 24509 10 9380264 Continuous sheet 4D 23435 12 4 6291662 PT screw 1.8x8 FeZn torx6 14 9450592 Back cover 1D 25643 15 2 6290060 Screw M2x5–BT ZNB torx6 16 0660101 Antenna AHA–12 JTI/DAMPS 824–894 MHz 17 2 9460109 Plug 4D 23622 18 9457112 Connector cover 3D 23772 T1 0200175 UIF module DU4 T2 0200674 System module GR4

2 6291662 PT screw 1.8x8 FeZn torx6 2 6291664 PT screw 1.8x16 FeZn torx6

9560038 Edge clip 4D 26284

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NHC–4

11/97JR Technical Documentation

Exploded View of NHC–4NB and NHC–4HB

7–7

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NHC–4

11/97JR Technical Documentation

7–8

Assembly Parts of NHC–4NB and NHC–4HB

ITEM Q’TY CODE DESCRIPTION VALUE, TYPE

1 9457224 Front cover 2C 24657 2 9450762 Window 3C 26272 5 9790055 Side keymat 3D 22995 6 9790128 Power keypad 4D 25043 7 9790200 Keypad 4C 26258 8 9460152 A–shield 1D 24508 9 9540009 B–shield 0D 24509 10 9380264 Continuous sheet 4D 23435 12 4 6291662 PT screw 1.8x8 FeZn torx6 14 9450592 Back cover 1D 25643 15 2 6290060 Screw M2x5–BT ZNB torx6 16 0660101 Antenna AHA–12 JTI/DAMPS 824–894 MHz 17 2 9460109 Plug 4D 23622 18 9457112 Connector cover 3D 23772 T1 0200629 UIF module GU3 T2 0200674 System module GR4

2 6291662 PT screw 1.8x8 FeZn torx6 2 6291664 PT screw 1.8x16 FeZn torx6

9560038 Edge clip 4D 26284

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NHC–4

11/97JR Technical Documentation

7–9

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