– 7–1 –
7. REPAIR PROCEDURES
7.1. Introduction
This section provides information on testing the telephone. Thelayout is as follows:
Adjustment Procedure are described in Section 8.
7.2. Lead Free (PbF) solder
7.3. External Testing
7.3.1. General Information
The handset can be connected to a compatible personal computer for electronic adjustment and fault diagnosis. This section
provides a description of the equipment required to perform those tasks.
Prior to testing and adjustment, the unit should first be disassembled, as detailed in Section 6, and then the PCB connected to
the PCB Repair Jig. Fault tracing can be performed on the PCB using suitable test equipment, such as spectrum analysers
and oscilloscope.
The unit must be tested and calibrated for all frequency bands (900 MHz and 1900 MHz).
Section 7.2. :
Lead Free (PbF) solder: Identification and repair of PCBs using PbF solder.
Section 7.3. :
External testing: describes equipment requirements and general set up procedure.
Section 7.4. :
Complete Unit Test Setup: Describes how the items of test equipment are used together and general set
up procedure.
CAUTION
The Printed Circuit Board (PCB) used in this telephone has been manufactured using Lead Free solder.
(SPARKLE ECO SOLDE : Part No. ESC F3 M705 0.3)
Lead Free solder has a higher melting point than Lead solder - typically 30 - 40
°
C higher. Always use a high temperature soldering iron
When using a soldering iron with temperature control, it should be set to 370
±
10
°
C (700
±
20
°
F).
When using lead solder, all PbF solder must be removed from the solder area. Where this is not possible, heat the PbF solder until it
melts before applying lead solder.
Avoid over heating PbF solder as it has a tendency to splash at temperatures above 600
°
C (1100
°
F).
Personal Computer (PC)
The PC (IBM compatible) is used as a Unit Under Test controller.
Power Supply
Provides 3.8 V DC supply to RF Adaptor and PCB Repair Jig.
Содержание EBG60 - CELL PHONE
Страница 19: ... 5 2 5 1 2 RF Function Block Figure 5 1 RF Function Block Diagram ...
Страница 35: ... 5 18 5 15 POWER SUPPLIES 5 15 1 Introduction ...
Страница 77: ... 8 19 Modify Cable lose ...
Страница 89: ... 11 1 11 LAYOUT DIAGRAMS 11 1 Main PCB ...
Страница 90: ... 11 2 11 2 Key PCB ...