About Lead Free Solder (Pbf); Suggest Pbf Solder; How To Recognize That Pb Free Solder Is Used - Panasonic TC-21FX30LA Service Manual

ABOUT LEAD FREE SOLDER (PbF)

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.
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).
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.
Caution
• PbF solder has a melting point that is 50° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with
temperature control and adjust it to 700° ± 20° F, (370° ± 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 much as possible the original PbF solder and be
sure that any remaining is melted prior to applying the Pb solder.
• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the
opposite side (See figure, below).
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.

HOW TO RECOGNIZE THAT PB FREE SOLDER IS USED

P.C.Boards marked as "PbF" use Pb Free solder. (See the figure below.) Pb Free is not used the Power Supply Board of this
unit.
(Example : Digital Board)
Q609
L624
L625 C738
76 75
L626
L658
51
100
IC605
50
L653 1
RA610
CH
L654
L642
25 26
RA609
C666
D602
S
RA602
BAT600
PFUP1330YA
DIGITAL BOARD COMPONENT VIEW
C672
CN612
8 1
C728
C668
Q613
1 16
E
R737
+3.3V/BAT
E
Q620
IC610
J600
D608
C726
8 9
D607
PbF
+24V
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TC-21FX30LA/LP / TC-29FX30LA/LP
Marked