Panasonic Palmcorder VHSC PalmSight PV-L759 Service Manual page 47

Replacement procedure for
Leadless (Chip) Component
The following procedures are recommended for the replace-
ment of the leadless components used in this Unit.
1. Preparation for replacement
a. Soldering Iron
Use a pencil-type soldering iron using less than 30
watts.
b. Solder
Eutectic Solder (Tin 63%, Lead 37%) is recom-
mended.
c. Soldering time
Do not apply heat for more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before
installation.
(130°C ~ 150°C, for about two minutes.)
Note :
a. Leadless component must not be reused after
removal.
b. Excessive mechanical stress and rubbing of the
component electrode must be avoided.
2. Removing the leadless component
Grasp the leadless component body with tweezers and
alternately apply heat to both electrodes. When the
solder on both electrodes is melted, remove leadless
component 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. The leadless compo-
nent is attached to the PCB with glue. So carefully
twist the component when removing it so as not to
break or damage any fail under the component.
b. Take care not to break the copper foil on the printed
board.
Chip
Soldering Iron
3. Installation of the leadless component
a. Presolder the contact points of the circuit board.
b. Press the part downward with tweezers and solder
both electrodes as shown below.
Tweezers
Soldering Iron
Presolder
Note :
Do not glue the replacement leadless component to the
circuit board.
SPECIAL NOTE
All integrated circuits and many other semiconductor
devices are electrostatically sensitive and therefore require
the special handlings techniques described under the
"ELECTROSTATICALLY SENSITIVE (ES) DEVICES"
section of this service manual.
MODEL NO. IDENTIFICATION MARK
Use Marks shown in the chart below to distinguish the
different models included in this Service Manual.
MODEL
PV-L759
PV-L779
PV-L859
NOT USED
Note:
Refer to Item 3 of Schematic Diagram Notes of Schematic
Diagram and Circuit Board Layout Notes, for Mark "Z."
1-26
Tweezers
Solder
Soldering Iron
MARK
A
B
C
Z