Panasonic KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT Service Manual ▷ View online
1 ABOUT LEAD FREE SOLDER (PbF: Pb free)
Note:
In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that
contains lead.
contains lead.
We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn),
Silver (Ag), and Copper (Cu).
Silver (Ag), and Copper (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder although, with some precautions, standard Pb solder can also be used.
work we suggest using the same type of solder although, with some precautions, standard Pb solder can also be used.
Caution
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•
•
•
PbF solder has a melting point that is 50°F ~70°F (30°C ~ 40°C) higher than Pb solder. Please use a soldering iron with
temperature control and adjust it to 700°F ± 20°F (370°C ± 10°C). In case of using high temperature soldering iron, please
be careful not to heat too long.
temperature control and adjust it to 700°F ± 20°F (370°C ± 10°C). In case of using high temperature soldering iron, please
be careful not to heat too long.
•
•
•
•
PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100°F (600°C).
•
•
•
•
If you must use Pb solder on a PCB manufactured using PbF solder, remove as much of the original PbF solder as possible
and be sure that any remaining is melted prior to applying the Pb solder.
and be sure that any remaining is melted prior to applying the Pb solder.
•
•
•
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When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the
opposite side (See the figure below).
opposite side (See the figure below).
1.1. Suggested PbF Solder
There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper
(Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu) or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufac
turer’s specific instructions for the melting points of their products and any precautions for using their product with other
materials.
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.
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KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
1.2. How to recognize that Pb Free solder is used
1.2.1. Base Unit PCB
1.2.1.1. Main
48
25
IC7
IC2
64
65
RFM1
IC6
11
1
22
1
1
1
128
103
102
24
38
39
44
23
18
PbF
Marked
(Component View)
1
PbF
TP14
ANT1
TP49
TP5
TP4
4 2
5
6
TP9
TP222
TP7
TP19
TP21
TP20
TP29
TP24
TP22
TP15
TP3
TP200
TP100
TP108
TP109
HSSP
SP
URX
UTX
GND
MIC1
TP101
TP102
TP103
TP223
TP224
MIC
Marked
(Flow Solder Side View)
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KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
1.2.1.2. Operation
SW531
PbF
Marked
(Component View)
1
4
7
2
5
8
0
SP
3
6
9
#
X1
X2
X3
MUTE
EXIT
GREET
ING
ANSWER
STOP
CLEAR
LEFT
TALK
STOP
DOWN
RIGHT
UP
M1
M2
M3
PbF
Marked
(Flow Solder Side View)
Note:
The location of the “PbF“ mark is subject to change without notice.
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KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
1.2.2. Cordless Handset PCB
IC3
IC2
IC1
IC10
PbF
Marked
(Component View)
MIC
INT
#
9
6
3
MAIL
SP
SW1
SOFT_A
CLEAR
TALK
S1
0
8
5
2
7
4
1
R
LED7
LED4
LED9
IC4
IC5
LED6
LED5
PbF
Marked
(Flow Solder Side View)
Note:
The location of the “PbF“ mark is subject to change without notice.
1.2.3. Charger Unit PCB
PbF
D1
J1
Marked
PbF
R1
R2
TP4
TP1
TP2
TP3
Marked
(Component View)
(Flow Solder Side View)
Note:
The location of the “PbF“ mark is subject to change without notice.
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KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
