NEC DB2000, Service Manual

Page: 2 / 199

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.