Symphonic WF27F4 Service Manual page 9

3. The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when remov-
ing it.
CBA
Masking
Tape
Tweezers
With Soldering Iron:
(1) Using desoldering braid, remove the solder from
Hot-air
Flat Pack-IC
Desoldering
Machine
Flat Pack-IC
(2) Lift each lead of the flat pack-IC upward one by
Fig. S-1-2
(3) Bottom of the flat pack-IC is fixed with glue to the
(4) Release the flat pack-IC from the CBA using twee-
With Iron Wire:
(1) Using desoldering braid, remove the solder from
(2) Affix the wire to a workbench or solid mounting
(3) While heating the pins using a fine tip soldering
3-2
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
Desoldering Braid
Flat Pack-IC
one, using a sharp pin or wire to which solder will
not adhere (iron wire). When heating the pins, use
a fine tip soldering iron or a hot air desoldering ma-
chine.(Fig. S-1-4)
Fine Tip
Soldering Iron
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
zers. (Fig. S-1-6)
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
point, as shown in Fig. S-1-5.
iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA con-
tact pads as shown in Fig. S-1-5.
Soldering Iron
Fig. S-1-3
Sharp
Pin
Fig. S-1-4
L14STA