Sharp MX-M264N, Service Manual, Page: 254 / 256

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T h e P W B ’ s o f th is m o d el e mp loys le ad-f ree sol d er . T h e “ LF ” ma r k s in d i cat e d on th e P W B ’ s a n d th e Ser v i c e Ma n ua l m e a n “ Le ad- Free ” sol d er .
LEAD - FREE S OLDER
T h e a l phab e t f ollo w in g th e LF ma r k s h o w s th e k in d o f le ad-f ree sol d er .
( 1 ) NOTE FOR THE U S E OF LEAD - FREE S OLDER THREAD
Wh en re pa irin g a le ad-f ree sol d er P W B , u se le ad-f ree sol d er th re ad.
Ne v er u se c on v en t ion a l le ad sol d er th re ad, wh i ch ma y cau se a b re akd o w n or a n acc i d en t.
Sin c e th e m el t in g-p oin t o f le ad-f ree sol d er th re ad is ab o ut 4 0 ° C h i gh er tha n that o f c on v en t ion a l le ad sol d er th re ad, th e u se o f th e
e xc l u si v e -u se sol d erin g iron is re c o mm en d e d.
( 2 ) NOTE FOR S OLDER I NG WORK
Sin c e th e m el t in g-p oin t o f le ad-f ree sol d er is ab o ut 220 ° C , wh i ch is ab o ut 4 0 ° C h i gh er tha n that o f c on v en t ion a l le ad sol d er , a n d i t s sol d erin g
capac i t y is in f erior t o c on v en t ion a l one , i t is apt t o k ee p th e sol d erin g iron in c on tact w i th th e P W B f or lon g er t i m e . T h is ma y cau se l a n d
se pa r at ion or ma y e xc ee d th e h e at- resis t i v e t e mp er atu re o f c o mp onen t s . Use eno ugh ca re t o se pa r at e th e sol d erin g iron f ro m th e P W B wh en
c o mp le t ion o f sol d erin g is c on f ir m e d.
Sin c e le ad-f ree sol d er in c l ud es a g re at er qua n t i t y o f t in , th e iron t i p ma y c orro d e e a sily . T u rn ON/OFF th e sol d erin g iron p o w er f re qu en t ly .
I f d i ff eren t-k in d sol d er re ma ins on th e sol d erin g iron t i p, i t is m el t e d t o g e th er w i th le ad-f ree sol d er . To av oi d th is , c le a n th e sol d erin g iron
t i p aft er c o mp le t ion o f sol d erin g w or k.
I f th e sol d erin g iron t i p is d is c olore d b l ack du rin g sol d erin g w or k, c le a n a n d f ile th e t i p w i th s t eel w ool or a f ine f iler .
Example:
5mm
Le ad- Free
Sol d er c o mp osi t ion
c o d e (Re f er t o th e
tab le at th e ri ght. )
< S older composition code of lead - free solder>
Sol d er c o mp osi t ion
Sn - A g- C u
Sn - A g- Bi
Sn - A g- Bi - C u
Sn -Z n - Bi
Sn - In - A g- Bi
Sn - C u- Ni
Sn - A g- S b
Bi - Sn - A g- P
Bi - Sn - A g
a
b
z
i
n
s
p
Sol d er c o mp osi t ion c o d e
a