Preparation Before Manual Soldering; Figure 3: Holding In Reverse - SimCom SIM300DZ Manuallines

SMT module de-soldering and rework Guidelines

3 Preparation before manual soldering

Assemble the customized square hot air tip on to the
assure it is immovably.
Power on the hot air soldering gun and the smoke absorber, keep a distance about 15cm
between the smoke absorber and PCBA.
It is recommended to set the temperature of the hot air to about 400℃ ± 20℃, the volume
of the air flow to 4.5 ± 0.5.
Caution should be taken for the ESD protection. The operator should take the anti
electrostatic discharge wristband for avoiding damage by static discharge when contact to the
components on PCBA.
If there are some big size DIP package components nearby the SIM300DZ module such as
electrolytic capacitors, potentiometers which intervenes the SIM300DZ module to be heating
by hot air soldering gun. They can be removed by soldering iron in advance. In addition, if
some components are not heat resistant, they can be screened from the hot air.
The correct posture of holding the hot air soldering gun by hand is shown as following figure
Module de-soldering and rework _UGD_V1.01

Figure 3: Holding in reverse

8
HAKKO850 and tighten the screw to
07.12.2009