Sharp GF-7500H - TRANSFORMERS; FILTERS

CGB)
Tubular-shaped chip jumper
Ordinary jumper Tubular-shaped chip
VWRASAS-— ---- VRD-MF2EE000C
Electrode
Appearance
Attach-
PWB
ment
on
PWB
Adhesive
Solder
Symbol on
wiring
diagram
LJ
Table 23-1
SERVICING OF LEADLESS TYPE RESISTORS AND
CAPACITORS
Here’s their servicing method different from that for the
ordinary type of resistors and capacitors.
Removal of the Tubular-Shaped Chip
1. Using a soldering iron, heat the solder at each terminal of
the chip to get it absorbed into a braided wire applied
thereon. See Fig. 23-1.
2. Holding the chip with a pincette, take if off gently using the
soldering iron’s heat applied on each terminal of it. See
Fig. 23-2.
Cautions on removal:
1. When handling the soldering iron, use a proper force and
keep a careful manner.
2. When removing the chip, do not use undue force with the
pincette.
3. The soldering iron in use should operate on AC mains;
it is best if provided with a thermal contro! (240° or so).
4. The chip once removed must not be used again.
Brajded
Tubular chip wire
Soldering iron
Copper foil
surface Solder
is)
~—
P.W.B.
Adhesive
Figure 23—1
Pincette
Tubular chip
Copper foil Soldering iron
surface
r
P.W.B. Adhesive
Figure 23-2
Attachment of Tubular-Shaped Chip
1. Temporarily solder one terminal of the chip on the copper
foil surface. See Fig. 23—3.
2. Holding one end of the chip with a pincette, completely
solter both terminals of it one after another. See Fig. 23—4.
Cautions on attachment:
1. When soldering the chip terminals, do not touch them
directly with the soldering iron. The soldering must be as
quick as possible being careful not to hurt the terminals and
the body itself.
2. When touching the chip with a pincette, hold its terminal
but never its body. See Fig. 23—4.
3. Keep the chip’s body in contact with the P.W.B. when
soldering.
4. The soldering iron in use should operate on AC mains;
it is best if provided with a thermal control (240° or so).
5. The soldering amount must be enough but not be outside
the specified area.
General Cautions on Handling and Storage
1. Oxidization on the chip’s terminals results in poor soldering.
Do not handle them with bare hands.
2. For storage, avoid the following places where oxidization
will occur and their capacitance or resistance will be
deteriorated.
1) Sulfur or chlorine gas floating places
2) Directly sunlit places
3) High temperature/high humidity places
Soldering iron
Solder
Copper foil
surface
as
P.W.B.
Figure 23-3
Soldering iron
Pincette NS
Solder
Copper foil
surface
+
P.W.B. Tubular chip
Figure 23—4
—23—