Sharp R-4H55 Service Manual page 30

R-4X55
R-4X55B
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MAGNETRON
CARRY OUT 3D CHECKS
Disconnect the H.V. wire A and filament lead(longer
one) of the transformer from the magnetron.
Release the main harness from the tabs of the air duct.
Remove the air duct from the oven cavity.
Carefully remove four (4) screws holding magnetron to
waveguide, when removing the screws holding the
magnetron to prevent it fro falling.
REMOVAL
6. Remove the magnetron from the waveguide with care
so the magnetron antenna should not hit by any metal
object around the antenna
7. Remove the magnetron cushion from the magnetron.
CAUTION: WHEN REPLACING THE MAGNETRON,
BE SURE THE R.F. GASKET IS IN PLACE
.
SCREWS ARE TIGHTENED SECURELY.
OVEN LAMP AND LAMP SOCKET REMOVAL
CARRY OUT 3D CHECKS
Remove the snap of the wire tie holding the wire leads
to the oven lamp from the hole of the oven cavity.
Remove the one (1) screw holding the magnetron air
guide to the oven cavity.
Lift up the tab holding the oven lamp socket.
Remove the oven lamp socket.
Pull the wire leads from the oven lamp socket by push-
ing the terminal hole of the oven lamp socket with the
flat type small screw driver.
Now, the oven lamp socket is free.
Figure C-l Oven lamp socket
TURNTABLE MOTOR REMOVAL
Disconnect the oven from power supply.
Remove the turntable and roller stay from the oven
5. Remove the two (2) screws holding the turntable motor
cavity.
to oven cavity bottom side and remove the turntable
Remove the one (1) screw holding the turntable motor
motor.
cover to the bottom plate and remove the cover.
6. Turntable motor is now free. At this time, o-ring and
Disconnect the wire leads from turntable motor.
washer is removed. Do not loose them.
TURNTABLE COUPLING REMOVAL
Remove the turntable motor, refer to "Turntable Motor
Removal".
At the time turntable coupling will be free.
Figure C-2. Turntable Coupling
FAN MOTOR REPLACEMENT
REMOVAL
1. CARRY OUT 30 CHECKS.
2. Disconnect the wire leads from the fan motor.
3. Disconnect the H.V. wire A and the filament
lead(longer one) of the power transformer from the
magnetron.
4. Release the H.V. wire A and filament lead from the
holes in the fan duct.
5. Remove the snap band of the wire leads connected to
the oven lamp from the hole of the oven cavity.
6. Remove the one (1) screw holding the magnetron air
guide to the oven cavity and remove the magnetron air
guide.
7. Release the tabs of the fan duct from the holes in the
9. Now, the fan motor assembly is free.
1 O.Remove the fan blade from the fan motor shaft accord-
ing the following procedure.
1) Hold the edge of the rotor of the fan motor by using a
pair of groove joint pliers as shown in Figure C-3(a).
CAUTION:
l
Make sure that any pieces do not enter the gap be-
tween 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.
8.
bottom plate and the back plate of the oven cavity.
Release the main wire harness from the hole in the fan
2) Remove the fan blade assembly from the shaft of the
duct.
fan motor by pulling fan retainer clip and rotating the
fan blade with your hand.
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