No.51957
GM-P421U
GM-P420UG
50
REPLACEMENT OF CHIP COMPONENT
!
CAUTIONS
1. Avoid heating for more than 3 seconds.
2. Do not rub the electrodes and the resist parts of the pattern.
3. When removing a c hip part, melt the s older adequately.
4. Do not reuse a chip part after removing it.
!
SOLDERING IRON
1. Use a high ins ulation s oldering iron with a thin pointed end of it.
2. A 30w s oldering iron is rec ommended for easily removing parts.
!
REPLACEMENT STEPS
1.
How to remove Chip parts
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Resistors, capacitors, etc
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with tweezers and remove the chip part.
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Transistors, diodes, variable resistors, etc
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove the
chip part.
Note : After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
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Resistors, capacitors, etc
(1) Apply solder to the pattern as indic ated in the figure.
(2) Grasp the chip part with tweezers and plac e it on the s older.
Then heat and melt the solder at both ends of the chip part.
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Transistors, diodes, variable resistors, etc
(1) Apply solder to the pattern as indic ated in the figure.
(2) Grasp the chip part with tweezers and place it on the solder.
(3) First s older lead
A
as indicated in the figure.
(4) Then solder leads
B
and
C
.
SOLDE R
SOLDE R
A
B
C
A
B
C
