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Sharp SJ-C20 SL Series - Precautions for Lead-Free Solder

Sharp SJ-C20 SL Series
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1 . E mplo yin g le ad-f r ee s o ld e r
T h e P W B o f t hi s mode l e m p loys l e a d - f re e sold e r . T h i s i s i n d i ca t ed b y t h e " L F " s y mbo l pr i n t e d on t he P W B a n d i n t h e s e rv i ce ma n u al . T h e s u f f i x le t t e r
indica t es t h e a l l o y t y p e o f t h e s o l d e r .
E xa m p l e:
2 . Using l e ad - f r ee w i re s o lder
W h en r e p a i r i n g a P W B w i t h t he " L F " s y m bo l , o n l y l ea d - f r ee so l d e r sh o u l d b e u se d . (U s i n g n o r m a l t i n / l e a d a l l o y s o l de r ma y r e s u l t i n c o l d so l d er e d
joi n t s a n d dam a ge t o pr i n t e d pa t t ern s . )
A s t he me l t i n g p o in t o f l e a d- f r e e s o l d e r i s a p p r ox i ma t e l y 4 0 ° C hi ghe r t ha n t i n / l ea d al l o y s o l d e r , i t i s r e co m m e nd t h a t a d e d i c a t e d bi t i s
us e d , a n d t h a t
t h e i r o n t e m pe ra t ur e i s a d j us t ed a c co r d i n g l y .
3 . Sold e ring
A s t he me l t i n g p o i n t o f l e a d - f r e e s o l de r ( S n - A g - Cu ) is h i g h er a nd h a s poo r e r w e t t a b i l i t y , ( f l o w) , t o p r e ve n t d a m a g e t o t h e la n d o f t h e P W B , ex t r em e
c a r e s h o u l d b e t a k e n n o t t o l ea v e t h e bi t i n con t a c t wi t h t he P W B f o r a n e x t e n d ed p er i od o f t i me . Rem o v e t h e b i t a s s o o n a s a g ood f l o w is a c h i e v ed .
T he hi gh c o n t e n t o f t i n i n le a d f r e e sol d e r will c a u s e p r em a t ur e c o r r o s i o n o f t h e b i t . T o r e d u c e w e ar o n t he b i t , r e d u c e t he t e mp e ra t ure or t u r n o f f t h e
i r o n when i t i s n o t re q u i r e d .
L e a v i n g d i f f e r e n t t y p e s o f s o l d e r on t h e b i t wi l l c a u s e c o n t a
m i n a t i o n o f t h e d i f f e r e n t a l l o ys , w h i c h wil l a l t e r t h e i r c h a r a c t e r i s t i cs , m a k i n g g o o d s o ld e r in g
m o r e d i ff i c u l t . I t will b e n e c e s sar y t o cl e a n a n d r e p l ac e b i t s m o r e o f t e n w hen u s i ng l e a d - f r e e s ol d e r . T o r e du c e b i t w e a r , c a r e s h ou l d b e t a k e n t o c l ea n
t h e b i t t horo ug h l y a f t e r e a c h use .
Indicate s lead-fre e solde r o f tin , silve r an d copper
[3] PRECAUTIONS FOR USING LEAD-FREE SOLDER
5 - 3
SJ-C19SS/C20XX

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