NEC N8 Bedienungsanleitung

Service Manual

(Level 3)

NEC Confidential & Proprietary

Introduction

This is the Electronic Service Manual for the N8 Tri Band GSM Digital

Cellular Telephone from NEC. It contains specific information on repair and test

procedures.

For details of user functions, general operation and installation, please

refer to the User Guide.

The Service Manual is set out in the following sections.

1. Precautions for

Repair Work: provides general guidelines for

undertaking safe and efficient repair work.

2. Unit Specification: provides the technical specifications for the

N8 GSM Digital Cellular Telephone.

3. Introduction of Service Level:

a) Service Level 1:describes definition of Service Level 1, equipment and

tools required for this level.

b) Service Level 2:describes definition, equipment and tools required for

Service Level 2.

4. Circuit Description: provides functional details of the circuits, block

diagrams and component purpose descriptions.

5. Servicing : defines the jigs, fixtures and test configurations required for

servicing the product; and describes the processes of assembly and

disassembly.

6. Troubleshooting : provides an aid to fault finding the product. Includes,

using the signal levels and plots at various parts of the circuit.

7. Device Information : provides functional information and pin-outs of most of

the semiconductor devices within the HHP.

8. Circuit Diagrams :

contains all the schematics diagrams.

9. Board Maps : contains all component layout diagrams.

10. Parts List :

provides information for the ordering of replacement parts.

11. Glossary :

terms used in this manual.

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Section 1

Precautions

for Repair Work

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Important

Please read the following cautions, notes and warnings

before progressing through this manual or undertaking

any repair action.

Remember: SAFETY FIRST!

CAUTION:

AC Power Cord:

Care must be taken not to damage the AC power cord as fire or electric shock may

result.

Battery Pack:

Only use the specified batteries and chargers with this equipment.

Do not short the battery terminals together.

Keep the battery pack away from fire and sources of ignition.

Remember to recharge the battery pack after each use.

Before Powering up the Equipment:

•Only switch on the telephone’s power once the test or installation set-up is complete.

•Switching on at the wrong time may result in electric shock or damage to system

components.

•Always ensure that the power is switched off before making connections /

disconnection’s.

•It is important to check that the correct DC voltage is applied to the equipment to

prevent electrical damage.

Component Polarity:

Always check the polarity of connections and components before soldering. Particular

attention must be paid to IC.s, diodes, transistors, capacitors and any other

semiconductor device that is polarity dependent.

Electrostatic Damage (ESD):

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Semiconductor devices are easily damaged by electrostatic discharge. Many of the

procedures detailed in this manual involve disassembly of the equipment and therefore

handling of the printed circuit boards.

To protect these devices from ESD a wrist strap connected to ground must be worn. In

addition to this the work surface must be covered with an anti-electrostatic mat, which

should also be grounded.

If printed circuit boards are to be stored without being re-assembled into their

equipment, then they must be kept in an anti-electrostatic bag.

Grounding:

Each piece of test equipment should be electrically grounded. A third (grounding) pin is

provided as a safety feature. Ensure that the electrical outlet also contains this feature.

Cosmetic Protection during Repair Work:

Always ensure that the working surface is kept clean and free from abrasive materials.

The LCD is very susceptible to scratches and damage. It should be covered with clear

adhesive vinyl while the equipment is disassembled.

Storage of Faulty Components:

Any components that are replaced due to failure should be kept safely in an anti-

electrostatic container. NEC’s Quality or Research & Development Departments may

require them to make quality and reliability investigations.

No Fault Found Equipment:

In some cases the reported symptom may not be apparent. You may subject the

equipment to a controlled amount of stress, vibration and temperature variation to see

if the fault occurs.

Care should be taken not to apply excessive stress or vibration or extreme temperature

variations as further faults may develop.

Soldering and Disordering :

Fast, accurate and high quality soldering is required to minimise the risk of heat damage

to the electronic components.

The soldering tip should not be in contact with components or PCB tracks for longer than

2 seconds.

Heat the pad on the PCB and the lead, quickly apply solder, remove heat and cool.

After soldering is complete, ensure that all solder joints are of good quality - no dry

joints, solder bridges, cracks or excess solder.

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The majority of chip components are machine mounted using solder paste. Removal of

the solder is not sufficient for chip component removal. Each solder point must be

heated simultaneously and quickly (to prevent component and PCB damage). When the

solder has melted, remove the component with tweezers.

Short Circuits:

Care must be taken to avoid short circuits. Soldering, solder dust, screws, metal

clippings, metal wrist watches etc. can cause short circuits on PCBs which may result in

component damage.

Test Equipment Calibration:

Your test equipment should be calibrated before use. Frequent calibration is essential

to ensure high quality and reliable repairs.

Cleaning:

Before cleaning ensure that the telephone is switched off and disconnected from the

power source. Cleaning should be done using a soft dry cloth. If the equipment is

heavily soiled a soft cloth soaked in a mild synthetic detergent diluted in water may be

used.

Never use benzene or any other chemicals to clean the equipment.

RF Shielding:

It is advisable to carry out detailed measurements and repair (in particular RX) in a

shielded area to minimise RF interference.

AC Adapter and Battery Charger:

The AC adapter and battery chargers are for indoor use only. Ensure that the devices

are not exposed to rain or moisture.

Electrical Safety:

Electrical equipment is hazardous if misused. Any repairs must be carried out with care

and only by authorised personnel.

Ensure all power sources are switched off and power cords removed before undertaking

any repairs.

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Hazardous Waste:

The battery pack, if incorrectly disposed of, is an environmental hazard. It must be

disposed of in accordance with the regulations of the country concerned.

Never dispose of the battery pack in fire or water.

Confidentiality:

The circuitry within this equipment contains several components that are regarded as

company confidential. Only use NEC specified parts as replacements.

RF Injury:

To avoid RF injury, direct exposure to radio frequency energy should be avoided. In

particular, exposed parts of your body (especially the eyes and face) should not come

into contact with the antenna while the equipment is transmitting.

Storage Conditions:

It is recommended that the following storage conditions should be avoided to prevent

damage to the equipment: -

Dusty.

Humid.

Near to magnetic equipment

In direct sunlight

Ventilation:

Repair areas should be well ventilated and fume extraction systems should be installed

where necessary. Potential hazardous substances are solder fumes, flux, alcohol etc.

PCB Handling:

It is recommend that cotton gloves are worn during repair work. This is to protect your

hands from chemical contamination and to protect the PCBs from fingerprints and

humidity.

SIM Card:

•Do not bend.

•Clean by using a soft dry cloth.

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Section 2

Unit Specifications

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PRODUCT FEATURE AND SPECIFICATION

Weight Approx. 112g

Volume Approx. 93cc

Form Factor Clamshell

Active flip Yes

LCD 120 x 160 TFT 65536(16bit) colours

2nd LCD 80 x 108 4096 colours

Antenna Build in

Navigation 4 way navigation key

Design

Camera 352Hx288V resolution

Type Li-ion

Voltage 3.7V (Max4.2V Min3.2V)

Capacity 780mAH (Min), 810mAh (Typ.)

Talk time Approx. 130 - 200 min *

Battery

Standby time Approx. 100 - 200 Hours *

Band GSM 900, DCS1800, DCS1900

GPRS Class 8

Voice codec FR, HR, EFR,

Multi-party Yes

Network

ALS Yes

Ring tones 23 pre-stored, 10 download

Ring tone format MIDI

Text input T9

Browser WML/xHTML/cHTML

Application

Phone book 500 + SIM

Harmony Ringer 40 PolyphonicMulti Media

Ring tone download Yes

* Battery life is Network dependent; variations may occur.

The N8800 HHP works closely with the network and the standby and talk times achieved

depend upon this. In particular the location of the HHP within the network, the type of

SIM, reception of area messages, the use of AMR, Full Rate speech, Half Rate speech or

Enhanced Full Rate speech and other factors will affect both standby and talk times.

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Transmitting Frequency

Range:

GSM : 890 - 915MHz

EGSM : 880 - 915MHz

DCS1800 : 1710 - 1785MHz

DCS1900 : 1850 - 1910MHz

Receiving Frequency Range:GSM : 935 - 960MHz

EGSM : 925 - 960MHz

DCS1800 : 1805 - 1880MHz

DCS1900 : 1930 - 1990MHz

TX - RX Duplex Spacing:GSM/EGSM : 45MHz

DCS1800 : 95MHz

DCS1900 : 80MHz

Channel Spacing:GSM/EGSM : 200KHz

DCS1800 : 200KHz

DCS1900 : 200KHz

Number of Channels:GSM : 124 (Numbered 1 to 124)

EGSM : 50 (Numbered 975 to 1023 & 0)

DCS1800 : 374 (Numbered 512 to 885)

DCS1900 : 299 (Numbered 512 to 810)

Power Class: GSM/EGSM : Class 4 (33 +/- 2dBm)

DCS1800 : Class 1 (30 +/- 2dBm)

DCS1900 : Class 1 (30 +/- 2dBm)

Data Rates (Packet): GSM/EGSM/DCS1800/DCS1900 :

Uplink : Up to 42.8Kbps (2 slot)

Downlink : Up to 85.6Kbps (4 slots)

Data Rates

(Circuit Switch):

GSM/EGSM/DCS1800/DCS1900 : Up to 14.4 Kbps

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