Panasonic PT53TW53G - 53" PROJECTION TV HD, Service Manual, Page: 4 / 246

2. About lead free solder (PbF)
NOTE
Lead is listed as (Pb) in the periodic table of elements. / In the information below, Pb will refer to
lead solder, and PbF will refer to Lead Free Solder. / The lead free solder used in our
manufacturing process and discussed below is (Sn+Ag+Cu). / Thatis Tin (Sn), Silver (Ag) and
Copper (Cu) although other types are available.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For
/ service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may
be / used. / PCBs manufacturedusing lead free solder will have the “PbF” or a leaf symbol
stamped on the / back of PCB.
CAUTION
- Pb free solder has a higher melting point than standard solder.
Typically the melting point is 50 ~ 70 °F (30 ~ 40 °C) higher. Please
use a high temperature soldering iron and set it to 700 ± 20 °F (370
± 10 °C).
- Pb free solder will tend to splash when heated too high (about 1100
°F or 600 °C). / If you must use Pb solder, please completely
remove all of the Pb free solder on the pins or solder area before
applying Pb solder. If thisis not practical, be sure to heat the Pb
free solder until it melts, before applying Pb solder.
- After applying PbF solder to double layered boards, please check
the component side for excess solder which may flow onto the
opposite side.
4