SMD
COMPONENT
REPLACEMENT
©
Cyrus
Audio
Ltd
Jun
2014
6
Cyrus
6
DAC,
Cyrus
8
DAC
service
manual
Issue
1
Use
tin/silver
solder
which
has
a
lower
melting
point.
Tin/silver
solder
paste
or
small
gauge
solder
(26SWG)
is
recommended.
Do
not
use
solder
containing
lead
when
servicing
these
products.
When
using
solder
paste
a
pressure
dispenser
should
be
used
to
ensure
the
correct
amount
of
solder
is
applied
to
each
pad.
Solder
paste
should
not
be
used
with
direct
heating
methods
as
the
solder
between
component
pins
may
not
be
melted.
If
necessary,
remove
excess
solder
paste
with
solder
braid.
Removing
SMD
resistors
and
capacitors
from
the
PCB
with
a
soldering
iron
1.
Fit
the
soldering
iron
with
a
tip
large
enough
to
bridge
both
ends
of
the
component.
2.
Place
the
soldering
iron
so
that
its
flat
tip
will
heat
both
ends
of
the
component
at
once.
3.
When
the
solder
melts,
remove
the
component
with
tweezers.
4.
Allow
the
PCB
to
cool
for
a
few
minutes,
removing
any
excess
solder
with
desoldering
braid.
Fitting
replacement
SMD
resistors
and
capacitors
to
the
PCB
with
a
soldering
iron
1.
Apply
a
little
flux
to
the
connections.
2.
Place
the
component
in
position.
3.
Tin
the
soldering
iron,
bring
the
tip
into
contact
with
the
PCB
pad
and
flow
solder
to
the
joint.
Avoid
bringing
the
soldering
iron
tip
directly
into
contact
with
the
component.
Removing
SMD
ICs
from
the
PCB
1.
Using
fine
tipped
side
cutters
or
tweezer
cutters,
snip
all
the
leads
of
the
device
and
remove
the
IC
body.
2.
Desolder
the
leads
from
the
PCB
pads.
3.
Clean
up
the
PCB
with
solder
braid.
Removing
SMD
ICs
with
a
hot
air
SMD
tool
1.
Fit
a
suitable
size
tip
for
the
IC
being
removed.
2.
Heat
the
IC
evenly
until
the
solder
melts.
3.
Remove
the
IC
with
tweezers.
Fitting
replacement
ICs
to
the
PCB
with
a
soldering
iron
1.
Check
that
the
pins
of
the
IC
are
not
distorted.
2.
Using
tweezers,
position
the
IC
over
the
footprint.
3.
Check
that
all
the
IC
pins
are
correctly
aligned
with
the
pads.
4.
With
a
very
fine
tip
soldering
iron,
solder
in
the
pins
at
the
corners
of
the
IC.
5.
Re
‐
check
the
alignment
and
correct
if
necessary.
6.
When
the
alignment
is
OK,
solder
the
remaining
pins
of
the
IC
to
the
PCB.
