Sharp R-990C Service Manual page 30

R-990C(S)
2. Remove the four (4) screws holding the panel frame to
the back plate.
3. Separate the panel frame and back plate.
4. Remove the three (3) screws holding the control unit to
the panel frame.
5. Lift up the control unit .
6. Now, the control unit and frame assembly are separated.
TURNTABLE MOTOR AND/OR COUPLING REMOVAL
1. Disconnect the oven from power supply.
2. Remove one (1) screw holding the turntable motor cover
to the base cabinet and take off the turntable motor cover.
3. Disconnect wire lead from the turntable motor.
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from the convection motor.
Remove the convection fan belt and pulley(M).
3. Remove two (2) screws holding the convection motor
mounting angle to the heater duct and base cabinet.
1. CARRY OUT 3D CHECKS.
2. Remove cooling fan motor and magnetron refer to
"Cooling Fan Motor Removal" and "Magnetron
Removal".
3. Disconnect wire leads from damper motor and damper
switch.
4. Remove two(2) ovenside screws holding damper motor
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the fan motor and
thermal cut-out.
3. Remove the three (3) screws holding the chassis
support to rear cabinet, control panel back plate and
waveguide.
4 Remove one (1) tab holding the fan duct to air guide .
5. Remove the fan motor assembly from the oven cavity.
6. Remove the fan blade assembly from the fan motor
shaft according the following procedure.
1) Hold the edge of the rotor of the fan motor by using a
pair of grove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor.
Because the rotor is easy to be shaven by pliers
and metal pieces may be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
* Do not transform the bracket by touching with the
pliers.
2) Remove the fan blade assembly from the shaft of the
fan motor by pulling fan retainer clip and rotating the fan
blade with your hand.
3) Now, the fan blade will be free.
CAUTION:
* Do not use this removed fan blade again.Because
the hole(for shaft) of it may become bigger than a
NOTE: 1. Before attaching a new key unit, remove remaining
4. Remove the two (2) screws holding the turntable motor
5. Pull the turntable coupling out of the oven cavity.
6. Turntable coupling and motor will be free.
CONVECTION MOTOR REMOVAL
4. Take out the convection motor assembly from the unit.
5. Remove two (2) screws and nuts holding the motor to
6. Convection motor is now free.
DAMPER ASSEMBLY REMOVAL
5. Damper assembly is free.
6. Remove one (1) screw holding damper motor to damper
7. Damper motor and switch are free.
FAN MOTOR REPLACEMENT
7. Remove the two (2) screws and nuts holding the fan
8. Now, the fan motor is free.
INSTALLATION
1. Install the fan motor and thermal cut-out angle to the
2. Install the fan blade assembly to the fan motor shaft
1) Hold the center of the bracket which supports the shaft
2) Apply the screw lock tight into the hole(for shaft) of the
3) Install the fan blade assemby to the shaft of fan motor
CAUTION:
* Do not hit the fan blade strongly when installed
* Make sure that the fan blade rotates smooth after
* Make sure that the axis of the shaft is not slanted.
3. Install the fan duct to the air guide.
4. Install the chassis support to the oven cavity with three
5. Connect the wire leads to the fan motor and the thermal
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adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.
2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of the
key unit to the correct position of control panel frame.
3. Stick the key unit firmly to the control panel
frame by rubbing with soft cloth not to scratch.
to the mounting plate of the oven cavity bottom.
The convection motor assembly is now free.
mounting angle.
angle to thermal protection plate (right).
motor angle and one (1) screw holding damper switch
to damper motor angle.
standard one.
motor and thermal cut-out mounting angle from the fan
duct.
fan duct with the two (2) screws and nuts.
according the following procedure.
of the fan motor on the flat table.
fan blade.
by pushing the fan blade with a small, light weight, ball
peen hammer or rubber mallet.
because the bracket may be transformed.
installed.
(3) screws.
cut-out, referring to the pictorial diagram.