Component Replacement And Adjustment Procedure - Sharp R-895(AL)M Service Manual

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. 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;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
Please refer to 'OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS', when carrying out any
of the following removal procedures:
To prevent an electric shock, take the following
measures.
1. Before wiring,
1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for
60 seconds.
2. Don't let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High volt-
age capacitor and High voltage rectifier assem-
bly.
2) Hot parts:
Top heating element, Bottom heating element,
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 two (2) screws holding the back plate to
the oven cavity rear plate. Remove the back plate
4. Remove the air duct assembly from the oven cavity
rear plate.
5. Remove the air duct assembly
6. Remove the eight (8) screws from rear and along the
side edge of case.
7. Slide the entire case back about 3 cm to free it from
retaining clips on the cavity face plate.
8. Lift the entire case from the oven.
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the filament lead of the high voltage trans-
former and the high voltage transformer secondary
wire from the high voltage capacitor.
3. Disconnect the high voltage wire B from the magnetron.
4. Remove one (1) screw holding earth side terminal of
the high voltage rectifier assembly.
5. Remove one (1) screw holding fan duct to the oven
cavity rear plate.
6. Remove one (1) screw holding capacitor holder to the
oven cavity rear plate.
7. Release the capacitor holder from the fan duct.
WARNING FOR WIRING
OUTER CASE REMOVAL
HIGH VOLTAGE COMPONENTS REMOVAL
R-895M - 24
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
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.
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Turntable motor.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its pin
is locked. And make sure that the wire leads should
not come off even if the wire leads is pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
9. Discharge the H.V. capacitor before carrying out any
further work.
10.Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 9 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENT OR WIRING.
CAUTION: WHEN THE OUTER CASE CABINET IS RE-
INSTALLED, INSTALL IT BEFORE THE
BACK PLATE IS INSTALLED, OR THE
OUTER CASE CABINET WILL BE DE-
FORMED.
8. Remove the high voltage capacitor from the capacitor
holder.
9. Disconnect the high voltage wire B and the high voltage
rectifier assembly from the high voltage capacitor.
10.Disconnect the high voltage rectifier assembly from the
high voltage wire B.
11.Now, the high voltage rectifier assembly and the high
voltage capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RETIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION
IS SECURELY FIXED TO THE CAPACITOR.