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Model
R-23AM
Pages
40
Size
1.26 MB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Revised (including )
File
r-23am.pdf
Date

Sharp R-23AM Service Manual ▷ View online

R-23AM
23
6. Remove the one (1) screw holding the air duct to the blower
motor.
7. Remove the four (4) screws holding the blower motor angle
to the blower motor.
8. Now, the blower motor is free.
UPPER
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the stirrer motor (upper).
3. Remove the one (1) screw holding the stirrer motor (upper)
to the oven cavity.
4. Turn and lift up the stirrer motor (upper).
5. Now, the stirrer motor (upper) is free.
LOWER
1. Disconnect oven from the power supply.
2. Remove the stirrer motor cover by snipping off the material
STIRRER MOTORS (UPPER AND LOWER) REMOVAL
Procedure
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock
®
 connector, pull down
the connector from the terminal.
3. Now, the connector is free.
CAUTION: WHEN CONNECTING THE POSITIVE
LOCK
®
  CONNECTORS TO THE TERMI-
NALS, CONNECT THE POSITIVE LOCK
®
CONNECTOR SO THAT THE LEVER
FACES YOU.
HOW TO RELEASE THE POSITIVE LOCK
®
 CONNECTOR.
Figure C-2. How to release the positive lock connector.
in four portions.
3. Where the portions have been snipped off bend the portions
flat. No sharp edge must be evident after removal of the stirrer
motor cover.
4. Disconnect the wire leads from the stirrer motor (lower).
5. Remove the one (1) screw holding the stirrer motor (Lower)
to the oven cavity.
6. Now, the stirrer motor (lower) is free.
7. After replacement use one (1) screw (XOTWW40P08000)  to fit
the stirrer motor cover.
Terminal
Push
Pull down
1
Lever
Positive lock®
connector
2
1. CARRY OUT 3D CHECKS.
2. Remove the oven lamp.
3. 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.
4. Lift up the oven lamp socket .
5. Now, the oven lamp socket is free.
OVEN LAMP AND LAMP SOCKET REMOVAL
Figure C-3. Oven lamp socket
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
TERMINAL INSULATOR REPLACEMENT
1. Open covers of the terminal insulator by using small flat type
screw driver.
2. Remove the receptacle from the terminal insulator.
3. Now, the terminal insulator is free.
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown illustlated
below.
CONTROL PANEL ASSEMBLY REMOVAL
The complete control panel should be removed for re-
placement of components. To remove the control panel,
proceed as follows:
1. Disconnect the oven from power supply.
2. Wait for 60 seconds to discharge the high voltage
capacitor.
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
3. Remove the air intake filter assembly from the base
plate.
4. Remove two (2) screws holding the control panel to the
base plate.
5. Pull down the control panel and remove it forward.
6. Disconnect connectors and wire leads from the control unit.
7. Now the control panel assembly is free.
Flat type
screw driver
Terminal 
insulator
RECEPTACLE
COVERS
R-23AM
24
1. CARRY OUT 3D CHECKS.
2. Remove the control panel from the oven cavity referring to
“CONTROL PANEL REMOVAL”.
3. Remove the two (2) screws holding the latch hook to the oven
cavity.
4. Open the door and pull the latch hook out of the oven cavity.
5. For stop switch removal
5-1. Disconnect the wire leads from the switch.
5-2. Push the retaining tabs outward slightly and then pull
the switch forwards and remove it from the latch hook.
INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVAL
6. For interlock or monitor switches removal
6-1. Disconnect the wire leads from the interlock or monitor
switches.
6-2. Remove the single (1) screw and nut holding the
interlock or monitor switches to the latch hook.
CAUTION: IF THE LATCH HOOK IS NEW, WHEN THE
INTERLOCK SWITCHES OR MONITOR
SWITCHES ARE INSTALLED, THE TWO (2)
TABS OF THE LATCH HOOK SHOULD BE
BROKEN.
INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT
Power supply cord
Cord bushing
Screw
Green/Yellow
wire
Brown wire
Blue wire
L
N
Noise filter 
C
AUTION FOR CONTROL PANEL REMOVAL
1) Hold the lower end (Position A, Fig. 1) of the touch control
panel assembly firmly while sliding it down and toward you.
2) If the Touch Control Panel is hard to remove;
(1) Insert a flat head screw driver into space  B . (Fig. 1)
(2) Rotate the screwdriver clockwise while holding position  C of
the Touch Control Panel. (Fig. 2)
TO AVOID DAMAGE TO TOUCH CONTROL PANEL,
COVER THE TIP OF SCREWDRIVER WITH TAPE.
10. Disconnect the connectors (G) and (E) from the control
unit.
11. Remove four (4) screws holding the control unit to the
panel frame assembly.
12. Now, the control unit and control panel frame (with switch
unit) are free.
CAUTION:
At installing control panel unit assembly to main body set:
1. Ensure the installation of wiring-related parts without
negligence.
2. When inserting wire cable to main body set, ensure
them free from caught-in trouble. In addition, when
installing the control panel assembly to base plate
with screws, be sure of pushing the control panel unit
upward to fix with screws firmly.
3. Do not allow any wire leads to come near the varistor
works, because it will explode and the wire leads near
by the varistor will be damaged.
SWITCH UNIT
13. Remove the three (3) screws holding the switch unit
(Main) to the control panel frame.
14. Remove the two (2) screws holding the  switch unit (Sub.)
to the control panel frame.
15. Now,  the switch unit is free
ROTARY ENCODER UNIT
13. Remove the two (2) screws holding the rotary encoder
unit to the control panel frame.
14. Remove the knob from the rotary encoder shaft.
15. Remove the one (1) special nut holding the rotary encoder
to the rotary encoder mounting plate.
16. Now,  the rotary encoder is free.
POWER SUPPLY CORD REPLACEMENT
1. CARRY OUT 3D CHECKS
B
A
C
B
Fig. 1
Fig. 2
TOUCH CONTROL PANEL
SCREW DRIVER
2. Release the cord bushing from the rear cabinet.
3. Disconnect the brown and blue wires of the power supply
cord from the noise filter.
4. Remove the single (1) screw holding the earth wire of power
supply cord.
5. Remove the power supply cord.
Re-install
1. Insert the power supply cord into the cord bushing.
2. Connect the brown and blue wires of power supply cord into
the terminals of noise filter, referring to pictorial diagram.
3. Install the green/yellow wire of power supply cord with the
one (1) screw.
4. Re-install the cord bushing to the rear cabinet.
5. CARRY OUT 4R CHECKS.
Figure C-4. Power supply cord replacement
Replacement of individual component is as follows:
CONTROL UNIT AND CONTROL PANEL FRAME (WITH
SWITCH UNIT)
8. Remove three (3) screws holding the control panel
mounting angle to the panel frame.
9. Lift up the control panel mounting angle from the panel
frame.
In case interlock switches, stop switch and monitor switches do
not operate properly due to a mis-adjustment, the following
adjustment should be made.
1. Loosen the two (2) screws holding the latch hook.
2. With the door closed, adjust the latch hook by moving it back
and forward, or up and down. In and out play of the door
R-23AM
25
allowed by the latch hook should be less than 0.5mm. The
vertical position of the latch hook should be placed where the
stop switch and interlock switches have activated with the
door closed.
The horizontal position of the latch hook should be placed
where the monitor switches have activated with the door
closed.
3. Secure the screws with washers firmly.
4. Make sure of the interlock switches, stop switch, and monitor
switches operation. If those switches have not activated with
the door closed, loose two (2) screws holding latch hook and
adjust the latch hook position.
After adjustment, make sure of the following:
1. In and out play of door remains less than 0.5mm when in the
latched position.
2. The stop switch and interlock switches interrupt the circuit
before the door open when the door release lever is pulled,
and then and monitor switch close the circuit when the door
is opened.
3. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Figure C-5 Latch Switch Adjustments
DOOR REPLACEMENT AND ADJUSTMENT
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the two (2) screws holding each of the upper and
lower oven hinges to the oven cavity.
3. Remove door assembly with upper and lower oven hinges by
pulling it forward.
4. Release upper and lower oven hinges from door assembly.
5. Now, door assembly is free.
NOTE: When individual parts are replaced, refer to "Door
Disassembly".
RE-INSTALL
1. Insert the upper and lower oven hinges into door hinge pins.
2. Insert the upper and lower oven hinges with door assembly
into rectangular holes of oven cavity front plate.
3. Make sure that the door is parallel with oven face lines (left
and upper side line) and door latch heads pass through the
latch holes correctly.
4. Fasten upper and lower oven hinges firmly to oven cavity with
two (2) screws on each hinge.
Note: After any service to the door;
(A) Make sure that interlock switches, stop switch and
monitor switches are operating properly. (Refer to
chapter "Test Procedures".).
(B) An approved microwave survey meter should be used
to assure compliance with proper microwave radiation
emission limitation standards.
DOOR ADJUSTMENT
When removing and/or loosening hinges such as in door re-
placement, the following adjustment criteria are taken. Door
adjustment is performed with the door properly installed and
closed and while the oven hinges are loose.
1. Loosen upper and lower oven hinges with phillips head screw
driver.
2. Adjust the door by moving it vertically so that the top right
hand corner of the door is in line with the top of the control
panel frame assembly.
3. Tighten the upper and lower oven hinge screws.
After adjustment, make sure of the following:
1. Door latch heads smoothly catch the latch hook through the
latch holes, and the latch head goes through the center of the
latch hole.
2. Deviation of the door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. The door is positioned with its face depressed toward the
cavity face plate.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Note:
The door on a microwave oven is designed to act as an
electronic seal preventing the leakage of microwave
energy from oven cavity during cook cycle. This function
does not require that door be air-tight, moisture (con-
densation)-tight or light-tight. Therefore, occasional
appearance of moisture, light or sensing of gentle warm
air movement around oven door is not abnormal and do
not of themselves, indicate a leakage of microwave
energy from oven cavity. If such were the case, your
oven could not be equipped with a vent, the very
purpose of which is to exhaust the vapor-laden air from
the oven cavity.
Figure C-6. Door Replacement
Latch head
SW4: Monitor switch
(Oven side)
SW3: Monitor switch
Latch hook
SW1: Interlock switch
SW2: Interlock switch
(Oven side)
SW5: Stop switch
Latch head
Joint lever
Door release
lever
Head lever
OUTER CASE
CABINET 
UPPER
OVEN HINGE
LOWER
OVEN HINGE
LATCH
HEADS
R-23AM
26
SERVICE INFORMATION
IMPORTANT: When the magnetron MG1 and/or MG2 is replacing, the relays (RY3 and RY4) on control unit must
be replaced at the same time. Because if the magnetron's life has been over, the relay's life may
also be over.
CHOKE COVER REMOVAL
1. Open the door and insert a putty knife (thickness of about
0.5mm) in gap between the choke cover and corner portion
of door panel to free engaging parts. Refer to Fig. C-7.
NOTE: As the choke cover and door panel are engage at 16
places, do not force any perticular part.
2. Remove the choke cover carefully. (If choke cover is broken,
replace with a new one.)
Figure C-7. Choke cover
DOOR COMPONENTS REMOVAL
UPPER AND LOWER OVEN HINGES REMOVAL
1. Remove the door assembly from oven cavity, referring to
"REMOVAL" of "DOOR REPLACEMENT AND ADJUST-
MENT".
2. Remove choke cover, referring to "CHOKE COVER RE-
MOVAL".
3. Release the oven hinges from the door panel.
4. Now, the oven hinges are free.
DOOR DISASSEMBLY
UPPER 
OVEN HINGE
LOWER 
OVEN HINGE
CHOKE COVER
DOOR 
HANDLE
LATCH HEAD
BENT
2
1
PUTTY KNIFE
PUTTY KNIFE
CHOKE COVER
DOOR PANEL
FRONT
BENT
DOOR HANDLE REMOVAL
1
. Remove the door assembly from oven cavity, "REMOVAL" of
"DOOR REPLACEMENT AND ADJUSTMENT".
2. Place door assembly on a soft cloth with latches facing up.
3. Remove choke cover from door panel, referring to "CHOKE
COVER REMOVAL".
4.  Remove two (2) screws holding the door handle to door.
5. Remove the door handle from door panel.
6. Now, door handle is free.
UPPER AND LOWER LATCH HEADS REMOVAL
7. Remove the door release lever from the door assembly.
8. Remove the three (3) screws holding the joint plate to the
door panel.
9. Release the latch spring from the tab of the joint lever and
joint plate.
10. Release the latch heads from joint lever and joint plate.
11. Now, the latch heads are free.
DOOR CASE REMOVAL
1. Remove the door assembly from oven cavity, referring to
"REMOVAL" of "DOOR REPLACEMENT AND ADJUST-
MENT".
2. Remove choke cover from door panel, referring to "CHOKE
COVER REMOVAL".
3. Remove door handle from door panel, referring to "DOOR
HANDLE REMOVAL".
4. Bend up four (4) nails of door case.
5. Remove door case from door panel.
6. Now, the door case is free.
DOOR GLASS REMOVAL
7. Remove the four (4) screws holding two (2) outside window
fixing plates to door panel.
8. Now, the door glass is free.
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