Sharp R-8R51 - Page 13

R-8R51(W}
R-8R51{B)
SERVICING
lowing parts:
REMEMBER
TO
CHECK
3D
High
voltage
capacitor,
Power
transformer,
Magnetron,
WARNING
TO
SERVICE
PERSONNEL
Microwave
ovens
contain
circuitry
capable
of
producing
very
high
voltage
and
current,
contact
with
fol-
High voltage rectifier assembly, High voltage harness.
REMEMBER TO CHECK 4R
1)
Di
fai
|
1)
Reconnect
all
leads
removed
from
components
isconnect
the
supply.
during
testing.
2)
Door
opened,
and
wedged
open.
2)
Retlece
the
ee
case
(cabinet).
p
3)
Discharge
high
voltage
capacitor.
3)
Reconnect
the
supply.
WARNING
AGAINST
THE
CHARGE
OF
THE
4)
Run
the
oven.
Check
all!
functions.
HIGH-VOLTAGE
CAPACITOR
seers
:
;
4
Microwave
ovens
should
not
be
run
empty.
To
test
Ce
aes
ee
aio
oven
fas
boo
for
the
presence
of
microwave
energy
within
a
switched
off.
Wait
for
60
seconds
and
then
cavity,
place
a
cup
of
cold
water
on
the
ake
short-circuit.
the
connection
of
_
the
turntable,
close
the
door
and
set
the
microwave
high-voltage
capacitor
(that
is,
of
the
con-
timer
for
two
(2)
minutes.
Set
the
power
level
to
necting
lead
of
the
high-voltage
rectifier)
HIGH
and
push
the
START
button.
When
the
two
against
the
chassis
with
the
use
of
an
insu-
minutes
has
elapsed
(timer
at
zero)
carefully
check
lated
screwdriver.
that
the
water
is
now
hot.
If
the
water
remains
cold
carry
out
3D
checks
and
re-examine
the
con-
Sharp
recommend
that
wherever
possible
nections
to
the
component
being
tested.
fault-finding
is
carried
out
with
the
supply
discon-
nected.
It
may
in,
some
cases,
be
necessary
to
connect
the
supply
after
the
outer
case
has
been
removed,
in
this
event
carry
out
3D
checks
and
then
disconnect
the
leads
to
the
primary
of
the
power
transformer.
Ensure
that
these
leads
remain
isolated
from
other
components
and
the
oven
chassis.
(Use
insulation
tape
if
necessary.)
When
the
testing
is
completed
carry
out
3D
checks
and
reconnect
the
leads
to
the
primary
of
the
power
transformer.
4]
When
all
service
work
is
completed,
and
the
oven
is
fully
assembied,
the
microwave
power
output
should
be
checked
and
a
microwave
leakage
test
carried
out.
(RD81601 H}
TROUBLESHOOTING
GUIDE
IMPORTANT:
If
the
oven
becomes
inoperative
be-
cause
of
a
blown
fuse
F1
(F6.3A)
in
the
istd
latch
switch
-
monitor
switch
-
monitor
resisitor
circuit,
check
the
1std
latch
switch,
monitor
switch
and
monitor
resistor
before
replacing
the
fuse
F1
(F6.3A).
When
troubleshooting
the
microwave
oven,
it
is
helpfull
to
follow
the
Sequence
of
Operation
in
per-
forming
the
checks.
Many
of
the
possible
causes
of
trouble
will
require
that
a
specific
test
be
performed.
These
tests
are
given
a
procedure
letter
which
will
be
found
in
the
"Test
Procedure’section.
ot ee a ee
11