Magnetron Removal; Fan Motor Replacement - Sharp R-7N76(B)M Service Manual

R-7N76(W)M
R-7N76(B)M
1. CARRY OUT 3D CHECKS.
2. Remove the air separate duct B from the chassis support
and the air intake duct.
3. Disconnect the H.V. wire B and filament lead of the
transformer from the magnetron.
4. Remove the one (1) screw holding the chassis support to
the magnetron.
5. Move the air intake duct to left.
6. Remove the air deflector from the magnetron.
7. Carefully remove four (4) screws holding magnetron to
waveguide, when removing the screws hold the magnetron
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the noise filter to the
chassis support.
3. Release the noise filter from the tabs of the fan duct.
4. Disconnect the wire leads from the fan duct.
5. Remove the one (1) screw holding the capacitor holder
to the oven cavity back plate.
6. Release the tabs of the capacitor holder from the fan
duct.
7. Remove the one (1) screw holding the fan duct to the
oven cavity back plate.
8. Remove the fan duct from the oven.
9. Remove the fan duct 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 groove joint pliers.
CAUTION:
• Make sure that any pieces do not enter the gap
between the rotor and the starter 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 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
become bigger than a standard one.
Coil
Groove joint pliers
Stator
Gap
Rotor
Bracket
Rear view

MAGNETRON REMOVAL

FAN MOTOR REPLACEMENT

the hole (for shaft) of it may
Shaft
Axis
Stator
Rotor
Side view
to prevent it from falling.
8. Remove the magnetron from the waveguide with care so
the magnetron antenna is not hit by any metal object
around the antenna.
9. Remove the magnetron cushion from the magnetron.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS ARE
TIGHTENED SECURELY.
10. Remove the two (2) screws and two (2) nuts holding the
fan motor to the fan duct.
11. Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws and two (2) nuts.
2. Install the fan blade to the fan motor shaft according the
following procedure.
1) Hold the centre of the bracket which supports the shaft
of the fan motor on the flat table.
2) Apply the screw lock tight into the hole (for shaft) of the
fan blade.
3) 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 strongly when installed
because the bracket may be transformed.
• Make sure that the fan blade rotates smooth after
installed.
• Make sure that the axis of the shaft is not slanted.
3. Install the fan duct to the oven cavity back plate with the
one (1) screw.
4. Insert the tabs of the capacitor holder to the fan duct.
5. Install the capacitor holder to the oven cavity back plate
with the one (1) screw.
6. Install the noise filter to the fan duct and the chassis
support with the one (1) screw.
7. Re-connect the wire leads to the fan motor.
These are the positions
that should be pinched
with pliers.
30
Shaft
Table Center of
bracket