Panasonic KX-F900 Service Manual page 66

KX-F900 I
(6) CHECK SOLDERING
We should check soldering at first.
Because many problem are caused by a defective soldering.
I How to Visual-Check the soldering I
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.
I A basis of soldering is skirfl I
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
SMT (QFP. SOP) parts : ASIC, MDM, SRAM
skirt
SMT (PLCC) parts : CODEC
./__ skirt
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i |
Leaded parts
Chip parts Resistor array
sJirt
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