Sharp R-4A68, Service Manual

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19
R-4A68
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 wire B from the capacitor.
7. Disconnect filament lead of the power transformer from
the high voltage 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
10.Disconnect the high voltage rectifier assembly from
capacitor.
12.Now, capacitor and rectifier assembly are free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER 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.
OVEN LAMP AND LAMP SOCKET REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove one (1) screw holding the chassis support to the
magnetron and magnetron air duct.
3. Remove one (1) screw holding the chassis support to the
oven cavity front plate.
4. Remove the chassis support from the oven cavity.
5. Release the magnetron air duct from the oven cavity.
6. Remove the oven lamp socket from the magnetron air
duct by bending the small tab of magnetron air duct.
7. Pull the wire leads from the oven lamp socket by pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
8. Remove the oven lamp from the oven lamp socket by
turning the oven lamp.
9. Now, the oven lamp and lamp socket are free.
Figure C-1. Oven lamp socket
Oven lamp
socket
Terminal
Wire lead
Flat type small
screw driver
Terminal hole
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).
Figure C-2 Positive lock ® connector
Terminal
Push
Pull down
1
2
Lever
Positive lock®
connector