Cooling Fan Motor Removal; Convection Motor Removal - Sharp R-820BK Service Manual

REMOVAL
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor.
5. Remove the one (1) screw holding the capacitor holder
to the oven cavity rear plate.
6. Remove the one (1) screw holding the fan duct to the
oven cavity rear plate.
7. Release the tabs of the capacitor holder from fan duct.
8. Remove the fan duct from the oven.
9. Remove the fan blade from the fan motor shaft according
to the following procedure.
10.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
* Make sure that no metal pieces enter the gap
between the rotor and the stator of the fan motor
because the rotor is easily 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 disfigure the bracket by touching with the
pliers.
11.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
12. Now, the fan blade will be free.
Coil
Groove joint pliers
Stator
Gap
Bracket
Rotor
Rear View
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Now, the back plate with the sub back plate should be
removed.
5. Disconnect the wire leads from the convection motor.
6. Remove the two (2) screws holding the conv. thermal
cover to the oven cavity rear plate.
7. Remove the four (4) screws holding the convection
duct to the oven cavity rear plate.
8. Remove the convection duct assembly from the oven
cavity rear plate.
9. Remove the one (1) nut and the two (2) washers holding
the convection fan to the convection motor shaft.
10.Remove the convection fan.

COOLING FAN MOTOR REMOVAL

Shaft
Axis
Stator
Rotor
Side View

CONVECTION MOTOR REMOVAL

33
CAUTION:
* Do not reuse the removed fan blade because the
hole (for shaft) may be larger than normal.
13.Remove the two (2) screws holding the fan motor to the
fan duct.
14.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws.
2. Install the fan blade to the fan motor shaft according to
the following procedure.
3. Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
4. Install the fan blade to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.
CAUTION:
* Do not hit the fan blade hard when installing because
the bracket may be disfigured.
* Make sure that the fan blade rotates smooth after
installation.
* Make sure that the axis of the shaft is not slanted.
5. Install the fan duct to the oven cavity rear plate with the
one (1) screw.
6. Insert the tabs of the capacitor holder to the fan duct.
7. Install the capacitor holder to the oven cavity rear plate
with the one (1) screw.
8. Re-connect the wire leads to the fan motor.
These are the positions
that should be pinched
with pliers
11.Remove the three (3) screws holding the convection
duct to the conv. thermal cover.
12.Remove the convection duct with the conv. air angles
from the conv. thermal cover.
13.Remove the thermal insulation.
14.Remove the one (1) pipe holding the cooling fan to the
convection motor shaft.
15.Remove the cooling fan and the one (1) washer from the
convection motor shaft.
16.Remove the two (2) screws holding the convection motor
to the conv. thermal cover.
17.Remove the convection motor from the conv. thermal
cover.
18.Remove the one (1) ring from the convection motor
shaft.
19.Now, the convection motor is free.
R-820BK
R-820BW
Shaft
Center of
Table
bracket