Panasonic KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT Service Manual ▷ View online
30 HOW TO REPLACE FLAT
PACKAGE IC
30.1. Preparation
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PbF (: Pb free) Solder
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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.
expert may be able to use a 60 to 80 Watt iron where
someone with less experience could overheat and damage
the PCB foil.
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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).
(P.4).
30.2. Procedure
1. Tack the flat pack IC to the PCB by temporarily soldering
two diagonally opposite pins in the correct positions on the
PCB.
PCB.
Be certain each pin is located over the
correct pad on the PCB.
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.
enough solder to the tip so that it flows under the pins as
they are heated.
30.3. Modification Procedure of
Bridge
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.
101
KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
31 CABINET AND ELECTRICAL PARTS LOCATION (BASE
UNIT)
102
KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
32 CABINET AND ELECTRICAL PARTS LOCATION
(CORDLESS HANDSET)
103
KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
33 CABINET AND ELECTRICAL PARTS LOCATION
(CHARGER UNIT)
104
KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
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