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TROUBLESHOOTING GUIDE
KX-F680BX/KX-F2681BX
(7) CHECK SOLDERING
We should check soldering at first.
Because many problem are caused by a defective soldering.
How to Visual-Check the soldering
Defective soldering (shorted, un-welded, oxidized...) doesn't have a good looking outward.
In order words outward (gloss, brightness, form) is important for soldering. So we should do visual inspection.
A basis of soldering is skirt!
Smooth skirt is shaped by surface tension as melting cream solder in reflow machine or lifting P.C. Board
from DIP.
Section of Soldering Skirt
skirt
Leaded parts
SMT (QFP. SOP) parts : ASIC, MDM, SRAM SMT (PLCC) parts : CODEC
Chip parts Resistor array
skirt
skirt
skirt
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