Sharp R-480J service manual Magnetron Removal, Turntable Motor Removal

R-480J

MAGNETRON REMOVAL

Removal

1.CARRY OUT 3D CHECKS.

2.Disconnect wire leads from magnetron.

3.Remove the two (2) screws holding the magnetron air duct to magnetron. And slide magnetron air duct slightly so that two (2) screws at left hand side of magnetron appear.

4.Carefully remove the four (4) screws holding magnetron to waveguide flange.

5.Remove magnetron with care so that magnetron antenna is not hit by any metal object around antenna.

6.Now, the magnetron is free.

Re-install

1. Re-install the magnetron to waveguide flange with care

so that magnetron antenna is not hit by any metal object.

2.Secure the magnetron with four (4) screws.

3.Hold the magnetron air duct to the magnetron and secure the magnetron air duct with two (2) screws.

4.Re-connect the wire leads to the magnetron. Refer to

"PICTORIAL DIAGRAM".

5.Re-install outer case and check that the oven is operating properly.

CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY

HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL

1.CARRY OUT 3D CHECKS.

2.Disconnect the wire lead from the fan motor.

3.Remove the fan duct from the oven cavity.

4.Remove two (2) screws holding the fan motor to the oven cavity back plate and remove it.

5.Disconnect the wire lead of high voltage rectifier assembly from the magnetron.

6.Disconnect high voltage fuse from the capacitor.

7.Disconnect filament lead of the power transformer from the capacitor.

8.Remove one (1) screw holding the capacitor holder to the bottom plate.

9.Remove one (1) screw holding high voltage rectifier assembly to the capacitor holder.

10.Remove the capacitor holder

11.Disconnect the high voltage rectifier assembly from capacitor.

12.Now, capacitor and rectifier assembly are free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC- TIFIER AND HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

TURNTABLE MOTOR REMOVAL

1.Disconnect oven from power supply.

2.Remove turntable and turntable support from oven cavity.

3.Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four portions.

4.Where the portions have been snipped off bend portions flat. No sharp edge must be evident after removal of the turntable motor cover.

5.Disconnect wire leads from turntable motor. (See "Positive lock connector removal")

6.Remove two (2) screws holding turntable motor to oven cavity.

7.Remove an o-ring and a washer from the turntable motor shaft.

8. Now the turntable motor is free.

HOW TO RE-INSTALL THE TURNTABLE MOTOR COVER

1.Remove the one (1) screw which is fixed on the bottom plate left near by the turntable motor cover. This screw will be used at the following step 3.

2.Insert the two (2) tabs of the turntable motor cover into the two (2) slits of the bottom plate left.

3.Hold the turntable motor cover to the bottom plate left with the one (1) screw which is prepared at the above step 1.

4.Now the turntable motor cover is re-installed.

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

Push the lever of positive lock® connector. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, IN- STALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU (SERVICE PERSON).

Terminal

Positive lock® connector

1

Push

Lever

2

Pull down

Figure C-1 Positive lock®connector

23