Panasonic KX-TG2220BXB, Руководство по обслуживанию, Страница: 62 / 86

23 HOW TO REPLACE A
FLAT PACKAGE IC
23.1. Preparation
• • • •
PbF (: Pb free) Solder
•
• •
•
Soldering Iron
Tip Temperature of 700°F ± 20°F (370°C ± 10°C)
Note: We recommend a 30 to 40 Watt soldering iron. An
expert may be able to use a 60 to 80 Watt iron where
someone with less experience could overheat and damage
the PCB foil.
•
• •
•
Flux
Recommended Flux: Specific Gravity
→
0.82.
Type
→
RMA (lower residue, non-cleaning type)
Note: See ABOUT LEAD FREE SOLDER (PbF: Pb free)
(P.4).
23.2. Procedure
1. Tack the flat pack IC to the PCB by temporarily soldering
two diagonally opposite pins in the correct positions on the
PCB.
Be certain each pin is located over the
correct pad on the PCB.
2. Apply flux to all of the pins on the IC.
3. Being careful to not unsolder the tack points, slide the
soldering iron along the tips of the pins while feeding
enough solder to the tip so that it flows under the pins as
they are heated.
23.3. Removing Solder from
Between Pins
1. Add a small amount of solder to the bridged pins.
2. With a hot iron, use a sweeping motion along the flat part of
the pin to draw the solder from between the adjacent pads.
62
KX-TG2220BXB / KX-TG2220B XF / KX-TG2220B XS / KX-TGA226BXB / KX-TGA226BXF / KX-TGA226BXS