Sharp R-961 (W) - Page 31

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,
it is then possible to hear a “click’ as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before oper-
ating 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.
. There is visible damage to the oven.
Onahwh
N
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. If the outer case (cabinet) is not fitted.
Please
refer
to
‘OVEN
AND
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 3cm to free it from
retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
HIGH VOLTAGE COMPONENTS REMOVAL
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 CAPACITOR
BEFORE TOUCHING ANY OVEN
COMPONENT OR WIRING.
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS
2. Disconnect the brown wire and blue wire of the power
supply cord from the noise filter.
3. Disconnect all the leads from the high voltage capacitor.
4. Remove one (1) screw holding capacitor holder to the
back plate.
5. Release the capacitor holder with the high voltage
capacitor from back plate.
6. Remove one (1) screwholding earth side terminal of high
voltage rectifier assembly.
HIGH VOLTAGE TRANSFORMER REMOVAL
. CARRY OUT 3D CHECKS
2. Disconnect the main wire harness from the high voltage
transformer.
3. Disconnectthe filament leads of high voltage transformer
from high voltage capacitor and the magnetron.
4. Disconnect the H.V. wire A from the magnetron and high
voltage capacitor.
_
CONTROL PANEL REMOVAL
1. CARRY OUT 3D CHECKS
2. Disconnect the connectors from the control unit.
3. Remove the two (2) screws holding the control panel to
the oven cavity and remove the control panel.
R-961 - 29
7. Disconnect the terminal of high voltage rectifier assembly
from the high voltage capacitor.
8. Now high voltage rectifier assembly is free.
9. Remove the capacitor from the capacitor holder.
10. Now high voltage capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION IS
SECURELY FIXED TO THE CAPACITOR
HOLDER WITH AN EARTHING SCREW.
5. Remove the tube inserted to the H.V. wire A and the
filament leads.
6. Disconnect the H.V. wire B from the high voltage
transformer.
7, Remove the two (2) screws and one (1) washer holding
the transformer to base plate.
8. Remove the transformer from the base plaie.
9. Now the high voltage transformer is free.
4. Liftup the control panel assembly and pull itfp ward. Now
the control panel assembly is free.
NOTE:
1. Before attaching a new key unit, remove remaining