Chapter 11. Component Replacement And; Before Operating; Outer Case Cabinet Removal; Adjustment Procedure 1] Before Operating - Sharp R-890SLM Service Manual

CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

[1] BEFORE OPERATING

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in
severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, High Voltage Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Avoid possible exposure to microwave energy. Please follow the instructions below before operating
WARNING:
the oven.
1. Disconnect the power supply cord.
2. 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;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
To prevent an electric shock, take the following manners.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door and block it 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:
Grill heating element, Oven lamp, Magnetron, High
voltage transformer and Oven cavity.
Please refer to 'OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS', when carrying out any of the following
removal procedures:

[2] OUTER CASE CABINET REMOVAL

To remove the outer case cabinet, 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 nine (9) screws from rear and along the side
edge of outer case cabinet.
Service_R-890SLM.indd 23
WARNING AGAINST HIGH VOLTAGE:
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)
4)
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 do not come off
even if the wire leads are pulled.
5. To prevent an error function, connect the wire leads correctly,
referring to the Pictorial Diagram.
7. Slide the entire case back about 3 cm to free it from retaining
clips on the cavity face plate.
8. Lift the entire outer case cabinet from the oven.
9. Discharge the H.V. capacitor before carrying out any further work.
10. Do not operate the oven with the outer case cabinet removed.
NOTE: Step 1, 2 and 9 form the basis of the 3D checks.
CAUTION: D I S C H A R G E H I G H V O LTA G E C A PA C I TO R
CAUTION: W H E N T H E O U T E R C A S E C A B I N E T I S
11 - 1
Sharp edge:
Bottom plate, Oven cavity, Waveguide flange, Chassis
support and other metallic plate.
Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Turntable motor, Convection
motor.
BEFORE TOUCHING ANY OVEN COMPONENT
OR WIRING.
REINSTALLED, INSTALL IT BEFORE THE BACK
PLATE IS INSTALLED, OR THE OUTER CASE
CABINET WILL BE DEFORMED.
R-890SLM
4/25/09 10:55:31 AM