Component Replacement And Adjustment Procedure - Sharp R-450B Service Manual

R-450B

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

Avoid possible exposure to microwave energy. Please follow the instructions below before
WARNING:
operating the oven.
1. Disconnect the oven from the 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
operating the oven.
Do not operate the oven if any of the following conditions
exist;
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
manners.
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
voltage capacitor and High voltage rectifier
assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage
REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the door stopper and the choke cover to
free engaging parts as shown in Figure C-7.
4. Try the principles of the lever and lift up the door
stopper.
5. Now, the door stopper is free from the door assembly.
6. Release two (2) pins of door panel from two (2) holes
of upper and lower oven hinges by lifting up.
7. Now, door assembly is free from oven cavity.
8. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-7 to free engaging parts.
9. Try the principles of the lever and lift up the choke cover
by inserting a putty knife as shown Figure C-7.
10.Release choke cover from door panel.
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
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.
WARNING FOR WIRING
3) Sharp edge:
4) Movable parts (to prevent a fault)
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.
DOOR REPLACEMENT
11.Now choke cover is free.
12.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
13.Now, latch head and latch spring are free.
10
transformer and Oven cavity.
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
Fan blade, Fan motor, Switch, Switch lever,
Open button.
Door stopper
1
2
13
12
11
10 5
6
9
7
8
Choke Cover
Figure C-7. Door Disassembly
3
4
Door Frame
Putty Knife