Daewoo TVZ 1321 Service Manual page 6

LEADLESS(CHIP) INSTRUCTIONS
1.LEADLESS(CHIP) COMPONENT REMOVAL INSTRUCTIONS
• The following procedures are recommended for the replacement of the leadless components used in this unit.
1-1. Preparation for replacement
a. Soldering Iron
Use a pencil-type soldering iron that uses less than 3o
watts.
b. Solder
Eutectic solder (Tin 63%, Lead 37%) is recommended.
c. Soldering time
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).
Note :
a. Leadless components must not be reused after
removal.
b. Excessive mechanical stress and rubbing of the
components electrode must be avoided.
1-2. Removing the leadless component (Resistors,
Capacitors)
Grasp the leadless component body with tweezers and
alternately apply heat to both electrodes. When the solder
on both electrodes is melted, remove leadless components
with a twisting motion.
Note :
a. Do not attempt to lift the component off the board
until the component is completely disconnected
from the board by a twisting action.
b. Take care not to break the copper foil on printed
board.
1-3. Installing the Leadless (chip) Component
1) Presolder the contact points of the circuit board.
2) Press the part downward with tweezers and solder
both electrodes as show below.
Note :
Do not glue the replacement leadless component to
the circuit board.
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