Samsung VXK-306 - Page 6

4.
Installing
the
Leadless
(chip)
Component
5,
Removing
of
Flate
ICs
1-4,
REPLACEMENT
PROCEDURE
FOR
LEADLESS
(CHIP)
COMPONENT
(Recommendable
manner)
Dae
ik.
ad
tact
points
of
the
circuit
board.
*
The
following
procedures
are
recommended
for
the
replacement
of
the
leadless
components
used
in
this
unit.
1)
Presolder
the
contact
poin
1)
For
removing
solder
chips
from
IC's
pins,
use
a
solder
remover or a wiry solder absorber.
1. Preparation for replacement 3. Removing the chip component (Transistors, Diodes) 2) Heat the IC's tips evenly by moving the chip IC
replacing
tool
around
them,
and
detach
the
IC's
leads
a. Soldering Iron "Ty Melt the solder of one lead. with a tool in the way of using a lever.
Use
a
pencil-type
soldering
iron
that
uses
less
than
ZL.
Soldering
Iron
3)
Do
not
reuse
ICs
removed
once
(Discard
them).
30 watts.
b. Solder Presolder
Eutectic solder (Tin 63%, Lead 37%) is recommended.
c. Soldering time Tweezers
Do not apply heat more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before
installation.
(130°
C~150°
C,
for
about
two
minutes).
2)
Press
the
part
downward
with
tweezers
and
solder
both
electrodes as shown below.
y Chip IC replacing tool
Note ;
a, Leadless component must not be reused after removal. ; . Note:
b.
Excessive
mechanical
stress
and
rubbing
of
the
2)
Lift
the
side
of
that
lead
upward.
Do
not
glue
the
replacement
leadless
component
to
the
circuit board.
component electrode must be avoided.”
2. Removing the leadless component
(Resistors, Capacitors)
oy,
Grasp the leadless component body with tweezers and Tweezers
alternately apply heat to both electrodes. When the Pan
solder on both electrodes is melted, remove leadiess < ‘ : Ge Soldering Iron
component with a twisting motion. Solder
Note: :
a. Do not attempt to lift the component off the board until
the component is completely disconnected from the
board by'a twising action.
b. Take care not to break the copper foil on printed board.
3) Simultaneously heat solder of the two remaining leads
and lift part to remove.
Tweezers
Soldering Iron: