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TEST AND MEASUREMENT
Hot-Air Blower
The blower air temperature should be at:
295 °C ±5 °C for an application time of 120 seconds or less,
or:
395 °C ±5 °C for an application time of 30 seconds or less.
Removal and re-mounting of components should be performed only once at any component position.
Note:
To avoid land detachment, do NOT apply excessive force on the soldering iron when heating the board. Ensure
that the solder has melted sufficiently to allow component removal without damaging the board.
Re-flowing / Re-touching
1.
Re-touching by soldering iron:
HAKKO 928 soldering iron is recommended.
900S-T-B tip for thicker solder joints and 900M-T-LB tip for thinner solder joints are recommended
2.
Tip temperature/time
Normal pad : 325±10°C, less than five seconds
Large Pad : 400±10°C, less than five seconds
3.
Pressure at solder tip
· Weight of soldering iron, (50gm) + 100gm to 150gm
· Do not exert pressure in the horizontal direction
4.
Retouching small components
Pinch the component using two soldering irons and retouch within four seconds
6.3. External Testing
6.3.1
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.
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 first be disassembled, as detailed in Section 4, and then the PCB Repair Jig used to
connect the PCBs together externally as they would be found in normal use. Fault tracing can then be performed on the PCBs
using suitable test equipment, such as spectrum analysers and oscilloscopes.
The unit must now be tested and calibrated for both frequency bands (900 MHz and 1800 MHz).
6.3.2
Jigs and Tools
Interface Box (Part No. IFB003 / IFB004)
The Interface box provides:
IFB003: 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 provides +4.8 V, +7.2V and +8.2 V DC outputs. It also allows selection of external
power via the Interface cable.
RS 232 interface. Ensures that the Unit Under Test is supplied with the correct signal levels and format.
Issue B
Revision 0
Section 6
– 30 –
MCUK011201C8
Service Manual
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