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Sharp R-961 (W) - Page 30

Sharp R-961 (W)
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TOUCH
CONTROL
PANEL
ASSEMBLY
SERVICING
1.
Precautions
for
Handling
Electronic
Components
This
unit
uses
CMOS
LSI
in
the
integral
part
of
the
circuits.
When
handling
these
parts,
the
following
precautions
should
be
strictly
followed.
CMOS
LS!
have
extremely
high
impedance
at
its
input
and
output
terminals.
For
this
reason,
it
is
easily
influenced
by
the
surrounding
high
voltage
power
source,
static
electricity
charge
in
clothes,
etc.,
and
sometimes
it
is
not
fully
protected
by
the
built-in
protection
circuit.
In
order
to
protect
CMOS
LSI.
1)
When
storing
andtransporting,
thoroughly
wrap
them
in
aluminium
foil.
Also
wrap
PW
boards
containing
them
in
aluminium
foil.
2)
When
soldering,
ground
the
technician
as
shown
in
the
figure
and
use
grounded
soldering
iron
and
work
table.
approx.
1M
ohm
on
.
Shapes
of
Electronic
Components
Cc
B
E
Transistor
p
DTA123ES
Transistor
Ec
KRA101M
2SB81238
KRC243M
.
Servicing
of
Touch
Control
Panel
We
describe
the
procedures
to
permit
servicing
of
the
touch
control
panel
of
the
microwave
oven
and
the
precautions
you
must
take
when
doing
so.
To
perform
the
servicing,
power
to
the
touch
control
panel
is
available
either
from
the
power
line
of
the
oven
itself
or
from
an
external
power
source.
(1)
Servicing
the
touch
control
panel
with
power
supply
of
the
oven
:
CAUTION:
THE
HIGH
VOLTAGE
TRANSFORMER
OF
THE
MICROWAVE
OVENIS
STILL
LIVE
DURING
SERV-
ICING
AND
PRESENTS
A
HAZARD
.
Therefore,
when
checking
the
performance
of
the
touchcontrol
panel,
put
the
outer
cabinet
on
the
oven
to
avoid
touching
the
high
voltage
transformer,
or
unplug
the
primary
terminal
(connector)
of
the
high
voltage
transformer
to
turn
it
off;
the
end
of
such
connector
must
be
insulated
with
an
insulating
tape.
After
servicing,
be
sure
to
replace
the
leads
to
their
Original
locations.
A.
Onsome
models,
the
power
supply
cord
between
the
touch
control
panel
and
the
oven
itself
is
so
short
that
the
two
can't
be
separated.
For
those
models,
check
and
repair
all
the
controls
R-961
-
28
(sensor-related
ones
included)
of
the
touch
contro!
panel
while
keeping
it
connected
to
the
oven.
B.
On
some
models,
the
power
supply
cord
between
the
touch
control
panel
and
the
oven
proper
is
so
long
enough
that
they
may
be
separated
from
each
other.
For
those
models,
therefore,
it
is
possible
to
check
and
repair
the
controls
of
the
touch
control
panel
while
keeping
it
apart
from
the
oven
proper;
in
this
case
you
must
short
both
ends
of
the
door
sensing
switch
(on
PWB)
of
the
touch
control
panel
with
a
jumper,
which
brings
about
an
operational
state
that
is
equivalent
to
the
oven
door
being
closed.
As
for
the
sensor-related
controls
of
the
touch
control
panel,
checking
them
is
possible
if
the
dummy
resistor(s)
with
resistance
equal
to
that
of
the
controls
are
used.
(2)
Servicing
the
touch
control
panel
with
power
supply
from
an
external
power
source:
Disconnect
the
touch
control
panel
completely
from
the
oven
proper,
and
short
both
ends
of
the
door
sensing
switch
(on
PWB)
of
the
touch
control
panel,
which
brings
about
an
operational
state
that
is
equivalent
to
the
oven
door
being
closed.
Connect
an
external
power
source
to
the
power
input
terminal
of
the
touch
control
panel,
then
it
is
possible
to
check
and
repair
the
controls
of
the
touch
control
panel;
it
is
also
possible
to
check
the
sensor-related
controls
of
the
touch
control
panel
by
using
the
dummy
resistor(s).
4.
Servicing
Tools
Tools
required
to
service
the
touch
control
panel
assembly.
1)
Soldering
iron:
30W
(It
is
recommended
to
use
a
soldering
iron
with
a
grounding
terminal.)
2)
Oscilloscope:
Single
beam,
frequency
range:
DC
-
10MHz
type
or
more
advanced
model.
3)
Others:
Hand
tools
.
Other
Precautions
1)
Before
turning
on
the
power
source
of
the
control
unit,
remove
the
aluminium
foil
applied
for
preventing
static
electricity.
Connect
the
connector
of
the
key
unitto
the
control
unit
being
sure
that
the
lead
wires
are
not
twisted.
3)
After
aluminium
foil
is
removed,
be
careful
that
abnormal
voltage
due
to
static
electricity
etc.
is
not
applied
to
the
input
or
output
terminals.
4)
Attach
connectors,
electrolytic
capacitors,
etc.
to
PWB,
making
sure
that
all
connections
are
tight.
5)
Be
sure
to
use
specified
components
where
high
precision
is
required.
Le)
—

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