TEST AND MEASUREMENT
MCUK990801C8
Section 6
Issue 1
Service Manual
– 29 –
Revision 0
6 TEST AND MEASUREMENT
6.1 Introduction
This section provides information on testing the GD90 telephone. The layout is as follows:
1.
Section 6.2 External testing: describes the test equipment required for the repair and calibration of the telephone.
2.
Section 6.3 Complete Unit Test Setup: describes how the items of test equipment are used together and general set up
procedure.
3.
Section 6.4 Channel box test commands: provides detailed explanation of the different commands available using the test
equipment and channel-box software.
4.
Section 6.5 Adjustment mode: describes adjustments available on the GD90 handheld unit.
5.
Section 6.6 Lock code: describes the procedure to check or reset the lock code using the Channel box software.
6.2 External Testing
The GD90 unit 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.
Testing and adjustment of the handheld unit can be performed with the outer case in place and the cradle connected. For in-
depth fault finding, the unit should be disassembled (refer to Section 4), and the two PCBs inserted into the PCB Repair Jig.
Fault finding can then be performed on the PCBs using suitable test equipment, such as spectrum analysers and oscilloscopes.
Before the repaired unit is returned to the customer, it must be tested and calibrated for both frequency bands (900 MHz and
1800 MHz) as well as for the two battery types.
6.2.1 Jigs and Tools
Test Equipment Descriptions
1.
Interface box,
Part Number: IFB003/IFB004
The IFB003 provides:
a.
Voltage regulation for +7.2 V, +5.6 V or 4.8 V DC outputs. The +7.2 V switch setting is used as a supply to Li-Ion type
batteries (compatible for other products), the 5.6 V switch setting is used for PCB testing and the 4.8 V switch setting is
used for testing the complete unit
Interface Box IFB004 is a later version that pr4.8 V, +7.2V and +8.6 V DC outputs. It also allows selection of
external power via the Interface cable.
b.
RS 232 interface. Ensures that the Unit Under Test is supplied with the correct signal levels and format..
Figure 6.1: Interface Box IFB003/IFB004
2.
Personal Computer (PC)
The PC (IBM compatible) is used as a Unit Under Test controller. This in conjunction with the channel box software, allows
all of the test facilities normally provided through the keypad of the Unit Under Test.
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