Sharp R-4P58 - Page 25

ae
COMPONENT
REPLACEMENT
AND
ADJUSTMENT
PROCEDURE
WARNING:
Avoid
possible
exposure
to
microwave
energy.
Please
follow
the
instructions
below
before operating the oven.
1. Disconnect oven from power supply. .
2,
Make
sure
that
a
definite”
click”
can
be
heard
when
the
microwave
oven
door
is
unlatched.
(Hold
the
door
in
a
closed
position
with
one
hand,
then
push
the
door
open
button
with
the
other,
this
causes
the
latch
leads
to
rise,
itis
then
possible
to
hear
a
“click’
as
the
door
switches
operate.)
3.
Visually
check
the
door
and
cavity
face
plate
for
dam-
age
(dents,
cracks,
signs
of
arcing
etc.).
Carry
out
any
remedial
work
that
is
necessary
before
operating
the
oven.
Do not operate the oven if any of the following conditions
exist;
. Door does not close firmly.
. Door hinge, support or latch hook is damaged.
. The door gasket or seal or damaged.
. The door is bent or warped.
. There are defective parts in the door interlock system.
. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
noahohds—
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. \f the outer case (cabinet) is not fitted.
Please
refer
to
‘OVEN
PARTS,
CABINET
PARTS,
CONTROL
PANEL
PARTS,
DOOR
PARTS’,
when
carrying
out
any
of the following removal procedures:
OUTER CASE REMOVAL
To remove the outer case proceed as follows.
1. Disconnect oven from power supply.
2.
Open
the
oven
door
and
wedge
it
open.
3.
Remove
the
screws
from
rear
and
along
the
side
edge
of
case.
4,
Slide
the
entire
case
back
about
3
cm
to
free
it
fram
retaining
clips
on
the
cavity
face
plate.
5. Lift the entire case from the oven.
6.
Discharge
the
H.V.
capacitor
before
carrying
out
any
further
work.
7.
Do
not
operate
the
oven
with
the
outer
case
removed.
N.B.;
Step
1,
2
and
6
form
the
basis
of
the
3D
checks.
CAUTION:
DISCHARGE
HIGH
VOLTAGE
CAPACI
TOR
BEFORE
TOUCHING
ANY
OVEN
COMPONENT
OR
WIRING.
HIGH
VOLTAGE
COMPONENTS
REMOVAL
(HIGH
VOLTAGE
CAPACITOR
AND
HIGH
VOLTAGE
RECTIFIER
ASSEMBLY)
To
remove
the
components,
proceed
as
follows.
1. CARRY OUT 3D CHECKS.
2.
Disconnect
all
the
leads
and
terminals
of
high
voltage
rectifier
assembly
from
the
high
voltage
capacitor.
3,
Remove
one
(1)
screw
holding
earth
side
terminal
of
the
high
voltage
rectifier
assembly.
4,
Remove
one
(1)
screw
holding
capacitor
holder
to
the
oven cavity.
.
Release
the
capacitor
holder
from
the
duct.
.
Remove
the
capacitor
from
the
capacitor
hoider.
Oy O1
7.
Now,
the
high
voltage
rectifier
assembly
and
the
ca-
pacitor
should
be
free.
CAUTION:
WHEN
REPLACING
HIGH
VOLTAGE
REC-
TIFIER
ASSEMBLY,
ENSURE
THAT
THE
CATHODE
(EARTH)
CONNECTION
IS
SECURELY
FIXED
TO
THE
CAPACITOR
HOLDER
AND
BASE
PLATE
WITH
AN
EARTHING SCREW.
HIGH
VOLTAGE
TRANSFORMER
REMOVAL
1. CARRY OUT 3D CHECKS.
2.
Disconnect
the
filament
leads
of
high
voltage
trans-
former
from
high
voltage
capacitor
and
the
magnetron.
3.
Disconnect
the
H.V.
wire
A
from
the
high
voltage
transformer.
4.
Disconnect
the
main
wire
harness
from
the
high
volt-
age transformer.
5.
Remove
the
four
(2)
screws
and
one
(1)
washer
holding
the
transformer
to
base
plate.
6. Remove the transformer.
7. Now the high voltage transformer is free.
MAGNETRON REMOVAL
1. CARRY OUT 3D CHECKS.
2.
Release
the
tabs
of
air
intake
duct
from
the
chassis
support
and
the
oven
cavity.
8
Disconnect
the
H.V. wire
B
and
filament
lead
of
the
transformer
from
the
magnetron.
4,
Remove
the
one
(1)
screw
holding
the
chassis
support
to
the
magnetron.
5. Move the air intake duct to left.
6. Carefully remove four (4) screws holding magnetron to
waveguide, when removing the screws hold the mag-
netron to prevent it from falling.