Nec Db2000 User manual

DB2000

Service Manual

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Introduction

This is the Electronic Service Manual for the MP5J1L1 Dual Band GSM Digital

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

test procedures.

For details on 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

MP5J1L1 GSM Digital Cellular Telephone.

3. Circuit Description provides functional details of the circuits, block

diagrams and component purpose descriptions.

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

servicing the product; and describes the processes of assembly and

disassembly.

5. Troubleshooting provides an aid to fault finding the product. Includes;

using the engineering functions, signal levels and plots at various parts

of the circuit and fault codes.

6. Device Information provides functional information and pin-outs of

most of the semiconductor devices within the HHP.

7. Parts provides information for the ordering of replacement parts.

8. Circuit Diagrams and Board Maps contains all the schematics and

component layout diagrams.

9. Glossary,, terms used in this manual.

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Important

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One incorrect adjustment may result in the need for many more and result in extra

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5

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!0

#'89:+2+

**2

""#*

%.

*22



'22

22

+

"**



$'(

;

<'(*2



!.*0

.

$.

22#

*32

'(462

=

'

'2

'(



$#*'

%*"*

*

'

(

'

equipment is heavily soiled a soft cloth dampened with a mild synthetic detergent



2=*

"

23>4

"

!'!('

$!'#

2

#

#*=!



#2



<=6

$2=



2

'

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Main Menu

Section 2

Unit

Specifications

Performance

GeneralGeneral

DB2000 (Standard Battery)

Talktime 150 mins

Standby 300 hours

Dimensions 130 x 45.5 x17.5

Volume 100cc

Weight 130g

SIM Size Plug in SIM

RF power output Class 4 GSM

Transmitting Frequency Range:

Receiving Frequency Range:

TX - RX Duplex Spacing:

Channel Spacing:

Number of Channels:

GSM: 890 - 915 Mhz

PCN: 1710 - 1785 Mhz

GSM: 935 - 960 Mhz

PCN: 1805 - 1880 Mhz

GSM: 45 MHz / PCN: 95Mhz

GSM: 200 Khz / PCN: 200 Khz

GSM: 124 (Numbered 1 to 124)

PCN: 374 (Numbered 512 to 885)

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