Sharp R530es Service Manual

							R530EWT
8 – 8
6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9)  Reconnect the oven to the power supply and check the sensor cook operation as follows:
a) Fill approximately 200 milliliters of tap water in a 1000 milliliter measuring cup.
b)  Place the container on the center of tray in the oven cavity.
c) Close the door.
d) Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pad 1 once.
e) The control panel is in automatic Sensor operation.
f) The oven turns off automatically, and the time for detecting moisture will be displayed.
If new sensor does not operate properly, the problem is with the control unit, and refer to explanation below.
2. CHECKING CONTROL UNIT
1)  Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the sensor connector that is mounted to control panel.
5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
6) Disconnect the leads to the primary of the power transformer.
7) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
8) After that procedure, re-connect the power supply cord.
9) Check the sensor cook operation proceed as follows:
a) Close the door. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pad 1
once.
b) The control panel is in the sensor cooking operation.
c) After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor.
d) After approximately 3 seconds, the display shows “X X. X X “ which is the time for detecting moisture.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
10)Disconnect the power supply cord, and then remove outer case.
11)Open the door and block it open.
12)Discharge high voltage capacitor.
13)Disconnect the dummy resistor circuit from the sensor connector of control panel.
14)Carry out necessary repair.
15)Reconnect all leads removed from components during testing and repairing.
16)Re-install the outer case (cabinet).
17)Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
18)Carry out “Water load cooking test” again and ensure that the oven works properly.
R1,R2:22Ω±1% 1/2W
R3:4.3kΩ±?5% 1/4W
R4:1MΩ±5% 1/4W
                                                                                                                      Sensor Dummy Resistor Circuit
Plunger
NC
NO
COM
COMNO
NC
R3 R4 R1
R2 1
2
3 F-1
F-2
F-3To connector (F)
on Control Unit.
CONNECTOR 
						

							R530EWT
9 – 1
R530EWTService Manual CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY
[1] OUTLINE OF TOUCH CONTROL PANEL 
The touch control section consists of the following units.
(1) Key Unit      
(2) Control Unit (The Control Unit consists of Power Unit and CPU
Unit). 
The principal functions of these units and the signals communicated
among them are explained below.
1. Key Unit
The key unit is composed of a matrix, signals generated in the LSI are
sent to the key unit through P00-P07. When a key pad is touched, a
signal is completed through the key unit and passed back to the LSI
through P17, P16,P15, P14, AIN7 and AIN6 to perform the function
that was requested.
2. Control Unit 
Control unit consists of LSI, reset circuit, indicator circuit, power
source circuit, relay circuit, buzzer circuit, synchronizing signal circuit,
absolute humidity sensor circuit and back light circuit.
1) Reset Circuit
This circuit generates a signal which resets the LSI to the initial
state when power is supplied.
2) Indicator Circuit
This circuit consists of 40 segments and 16 common electrodes
using a Liquid Crystal Display. The Liquid Crystal Display (LCD) is
drived by LCD driver IC3.3) Power Source Circuit
This circuit generates voltages necessary in the control unit from
the AC line voltage.In addition, the synchronizing signal is available
in order to compose a basic standard time in the clock circuit.
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable motor and light
the oven lamp.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit audible
sounds (key touch sound and completion sound).
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in order to com-
pose a basic standard time in the clockcircuit.It accompanies a very
small error because it works on commercial frequency.
7) Door sensing Switch
A switch to “tell” the LSI if the door is open or closed.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD10- LD15).
9) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow its auto-
matic cooking.Symbol Voltage Application
VSS -5V LSI (IC1) 
						

							R530EWT
9 – 2
[2] ABSOLUTE HUMIDITY SENSOR CIRCUIT
1. Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors as shown in the
illustration. One thermistor is housed in the closed vessel filled with dry
air while another in the open vessel. Each sensor is provided with the
protective cover made of metal mesh to be protected from the external
airflow.
2. Operational Principle of Absolute Humidity Sen-
sor
The figure below shows the basic structure of an absolute humidity
sensor. A bridge circuit is formed by two thermistors and two resistors
(R1 and R2).The output of the bridge circuit is to be amplified by the
operational amplifier.Each thermistor is supplied with a current to keep
it heated at about 150°C, the resultant heat is dissipated in the air and
if the two thermistors are placed in different humidity conditions they
show different degrees of heat conductivity leading to a potential differ-
ence between them causing an output voltage from the bridge circuit,
the intensity of which is increased as the absolute humidity of the air
increases.Since the output is very minute, it is amplified by the opera-
tional amplifier.
3. Detector Circuit of Absolute Humidity Sensor Cir-
cuit
This detector circuit is used to detect the output voltage of the absolute
humidity circuit to allow the LSI to control sensor cooking of the unit.
When the unit is set in the sensor cooking mode, 16 seconds clearing
cycle occurs than the detector circuit starts to function and the LSI
observes the initial voltage available at its AIN5 terminal.With this volt-
age given, the switches SW1 to SW5 in the LSI are turned on in such a
way as to change the resistance values in parallel with R98 ~ R102.
Changing the resistance values results in that there is the same poten-
tial at both F-3 terminal of the absolute humidity sensor and AIN4 ter-
minal of the LSI. The voltage of AIN5 terminal will indicate about -2.5V.
This initial balancing is set up about 16 seconds after the unit is put in
the Sensor Cooking mode. As the sensor cooking proceeds, the food
is heated to generate moisture by which the resistance balance of the
bridge circuit is deviated to increase the voltage available at AIN5 ter-
minal of theLSI.
Then the LSI observes that voltage at AIN5 terminal and compares it
with its initial value, and when the comparison rate reaches the preset
value (fixed for each menu to be cooked), the LSI causes the unit to
stop sensor cooking; thereafter, the unit goes in the next operationau-
tomatically.When the LSI starts to detect the initial voltage at
AN1terminal 16 seconds after the unit has been put in the Sensor
Cooking mode, if it is not possible to balance the bridge circuit due to
disconnection of the absolute humidity sensor, ERROR will appear on
the display and the cooking is stopped.1)Absolute humidity sensor circuit
Ventilation opening for sensingSensing part
(Open vessel)Sensing part
(Closed vessel) Thermistors
C
S
R3R1
R2+
-
Operational
a mplifie r
Output
volta ge
S:Thermistor
open vessel
C:Thermistor
closed vessel
2A bs o lu te h u m idity ( g/m )
Ou
tp
u
tvoltage
A bs o lu te h u m idity v s ,
output volta ge cha ra cteris tic
SW1
SW2
SW3
SW4
SW5P20
P21
P22
P23
P24
LSI
(IC1)
AIN4
AIN5
620k
300k
150k
75k
37.4k
26
23
22
50
49
24
25
47k 47k10k1234 8765
0.01uF0.015uF0.01u
F
VA : -15VVA : -15V
R90
C90
C91C93
C92S
F-2
1.8kIC2
F-1
F-3C
3.57k
3.32k
VC : -5V
0.1
uF
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
R98
R99
R96
R91
360kR93 R92R94
R95
D90
R100
R101
R102
R97 
						

							R530EWT
9 – 3
[3] SERVICING FOR TOUCH CONTROL PANEL
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits. When han-
dling these parts, the following precautions should be strictly followed.
CMOS LSI have extremely high impedance at its input and output ter-
minals. For this reason, it is easily influenced by the surrounding high
voltage power source, static electricity charge in clothes, etc., and
sometimes it is not fully protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in aluminium
foil. Also wrap PW boards containing them in aluminium foil.
2) When soldering, ground the technician as shown in the figure and
use grounded soldering iron and work table.
2. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the touch control
panel of the microwave oven and the precautions you must take when
doing so. To perform the servicing, power to the touch control panel is
available either from the power line of the oven itself or from an exter-
nal power source.
1. Servicing the touch control panel with power supply of the oven:
CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICRO-
WAVE OVEN IS STILL LIVE DURING SERVICING AND
PRESENTS A HAZARD.
Therefore, before checking the performance of the touch control
panel,
1) Disconnect the power supply cord and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components
and oven chassis by using insulation tape.
6) After that procedure, re-connect the power supply cord.
After checking the performance of the touch control panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power transformer.
4) Re-install the outer case (cabinet).
5) Re-connect the power supply cord after the outer case is
installed.
6) Run the oven and check all functions.
a) On some models, the power supply cord between the touch
control panel and the oven itself is so short that the two cant
be separated. For those models, check and repair all the
controls (sensor-related ones included) of the touch control
panel while keeping it connected to the oven.b) On some models, the power supply cord between the touch
control panel and the oven proper is so long enough that
they may be separated from each other. For those models,
therefore, it is possible to check and repair the controls of the
touch control panel while keeping it apart from the oven
proper; in this case you must short both ends of the door
sensing switch (on PWB) of the touch control panel with a
jumper, which brings about an operational state that is equiv-
alent to the oven door being closed. As for the sensor-
related controls of the touch control panel, checking them is
possible if the dummy resistor(s) with resistance equal to
that of the controls are used.
2. Servicing the touch control panel with power supply from an exter-
nal power source:
Disconnect the touch control panel completely from the oven
proper, and short both ends of the door sensing switch (on PWB) of
the touch control panel, which brings about an operational state
that is equivalent to the oven door being closed. Connect an exter-
nal power source to the power input terminal of the touch control
panel, then it is possible to check and repair the controls of the
touch control panel; it is also possible to check the sensor-related
controls of the touch control panel by using the dummy resistor(s).
3. Servicing Tools
Tools required to service the touch control panel assembly.
1) Soldering iron: 60W
(It is recommended to use a soldering iron with a grounding termi-
nal.)
2) Oscilloscope: Single beam, frequency range: DC - 10MHz type or
more advanced model.
3) Others: Hand tools
4. Other Precautions
1) Before turning on the power source of the control unit, remove the
aluminium foil applied for preventing static electricity.
2) Connect the connector of the key unit to the control unit being sure
that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal voltage
due to static electricity etc. is not applied to the input or output ter-
minals.
4) Attach connectors, electrolytic capacitors, etc. to PWB, making
sure that all connections are tight.
5) Be sure to use specified components where high precision is
required.
approx. 1M ohm 
						

							R530EWT
10 – 1
R530EWTService Manual CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER
Employing lead-free solder
The “Main PWB” of this model employs lead-free solder. This is indicated by the “LF” symbol printed on the PWB and in the service manual. The suffix
letter indicates the alloy type of the solder.
          Example:
Using lead-free wire solder
When repairing a PWB with the “LF” symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may result in cold soldered
joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40°C higher than tin/lead alloy solder, it is recommend that a dedicated bit is used, and that
the iron temperature is adjusted accordingly.
Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wet ability, (flow), to prevent damage to the land of the PWB, extreme
care should be taken not to leave the bit in contact with the PWB for an extended period of time. Remove the bit as soon as a good flow is achieved.
The high content of tin in lead free solder will cause premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the
iron when it is not required. 
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their characteristics, making good soldering
more difficult. It will be necessary to clean and replace bits more often when using lead-free solder. To reduce bit wear, care should be taken to clean
the bit thoroughly after each use.
Indicates lead-free solder of tin, silver and copper 
						

							R530EWT
11  –  1
R530EWTService Manual CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCE-
DURE
[1] WARNINGS
Please refer to “OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS”, when carrying out any of the following removal proce-
dures:
[2] OUTER CASE REMOVAL
To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) screws from the lower portion of the rear cabi-
net using a T20H Torx type or GTXH20-100 screw driver.4. Remove the remaining three (3) screws from rear.
5. Slide the entire outer case back out about 1 inch (3 cm) to free it
from retaining clips on the cavity face plate.
6. Lift entire outer case from the unit.
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result
in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
WARNING:Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
WARNING AGAINST HIGH VOLTAG E :
1. Disconnect the power supply cord.
2. Make sure that a definite "click" can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch leads to rise, it
is then possible to hear a "click" as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operat-
ing the oven.
Do not operate the oven if any of the following conditions exist;
1. Door does not close firmly.2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
To prevent an electric shock, take the following precau-
tions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Wait for 60 seconds, then discharge the high voltage
capacitor.
2. Do not let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, Power transformer and Oven
cavity.
WARNING FOR WIRING
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked and
make sure that the wire leads do not come off even if the
wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram. 
						

							R530EWT
11  –  2
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
DISCHARGE THE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
NOTE:When replacing the outer case, the 2 special Torx screws
must be reinstalled in the same locations.
[3] POWER TRANSFORMER REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads (primary) from power transformer and the fil-
ament leads from the magnetron and capacitor terminals.
5. Disconnect high voltage lead of the power transformer from the
high voltage capacitor.
6. Remove two (2) screws holding transformer to bottom plate.
7. Remove transformer from bottom plate.
2. REINSTALLATION
1. Rest transformer on the bottom plate with its primary terminals
toward the oven face plate.
2. Secure transformer with two (2) screws to bottom plate.
3. Reconnect the wire leads (primary) to power transformer and fila-
ment leads of transformer to magnetron and high voltage capacitor.
4. Reconnect the high voltage lead of the power transformer to the
high voltage capacitor. Refer to “PICTORIAL DIAGRAM”.
5. Reinstall outer case and check that oven is operating properly.
[4] HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire of the power transformer from the
high voltage capacitor.
5. Disconnect the high voltage wire of high voltage rectifier assembly
from the magnetron.
6. Disconnect the filament lead (short one) of the power transformer
from the high voltage capacitor.7. Remove the one (1) screw holding capacitor holder to the base
plate.
8. Remove the one (1) screw holding high voltage rectifier to the
capacitor holder.
9. Disconnect rectifier terminal from capacitor. high voltage rectifier
assembly is now free.
10.Remove capacitor holder. Capacitor is now free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND
HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMI-
NAL OF THE HIGH VOLTAGE RECTIFIER MUST BE
SECURED FIRMLY WITH A GROUNDING SCREW. 
[5] MAGNETRON REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect all wire leads from magnetron.
5. Remove the two (2) screws holding the chassis support to the mag-
netron and the oven cavity front flange.
6. Slide the magnetron duct slightly so that the two (2)screws at left
hand side of the magnetron appear.
7. Carefully remove the four (4) screws holding magnetron to
waveguide flange. 
8. Remove magnetron with care so that magnetron antenna is not hit
by any metal object around the antenna.
9. Now, the magnetron is free.
2. REINSTALLATION
1. Re-install the magnetron to waveguide flange with car to prevent
damage to the magnetron antenna. 
2. Secure the magnetron with the four (4) screws.
3. Hold the chassis support to the oven cavity front plate and the mag-
netron with the two (2) screws.
4. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL
DIAGRAM”.
5. Reinstall 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.
Special screw
Screw Driver
(Type: TORX T20 H or
GTXH20-100) 
						

							R530EWT
11  –  3
[6] OVEN LAMP REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the oven lamp.
5. Remove the one (1) screw holding the oven lamp to the magnetron
duct.
6. Remove the oven lamp from the magnetron duct.7. Now, the oven lamp is free.
 Figure C-1. Oven lamp
[7] POSITIVE LOCK  CONNECTOR (NO-CASE TYPE) REMOVAL
1. Disconnect the power supply cord, and remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock® connector. 
5. Pull down on the positive lock® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®
CONNECTORS TO THE TERMINALS,
INSTALL THE POSITIVE LOCK® SO THAT
THE LEVER FACES YOU
[8] CONTROL PANEL ASSEMBLY REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from panel components.
5. Remove the one (1) screw holding the control panel assembly to
the oven cavity front plate.
6. Slide the control panel assembly upward and remove it.
7. Now, individual components can be removed.
NOTE: 1) Before attaching a new key unit, wipe off remaining adhe-
sive on the control panel frame surfaces completely with a
soft cloth soaked in alcohol.
2) When attaching the key unit to the control panel frame,
adjust the upper edge and right edge of the key unit to the
correct position of control panel frame.
3) Stick the key unit firmly to the control panel frame by rub-
bing with soft cloth so not to scratch.1. CPU UNIT
NOTE: Handle the CPU unit carefully so that there is no excessive
force applied to the ribbon connection.
CPU unit
[9] TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Remove turntable and turntable support from oven cavity.
3. Lay the oven on its backside. Remove the turntable motor cover by
snipping off the material in four corners.
4. Where the corners have been snipped off bend corner areas flat.
No sharp edges must be evident after removal of the turntable
motor cover.5. Disconnect wire leads from turntable motor.
(See “Positive lock® connector removal”)
6. Remove one (1) screw holding turntable motor to oven cavity.
7. Now, the turntable motor is free.
8. After replacement use the one (1) screw XOTS740P10000 to fit the
turntable motor cover.
[10] COOLING FAN MOTOR REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor.5. Remove the two (2) screws holding the fan motor to the oven cavity
back plate.
6. Remove the fan blade from the fan motor shaft according to the fol-
lowing procedure. 
7. Hold the edge of the rotor of the fan motor by using a pair of groove
joint pliers.
Oven lamp
Terminal
Terminal
Push
Pull down1
2
Lever Positive lock¨
connector
Figure C-1.  Positive lock® connector
Printed wiring board
of CPU unit Liquid Crystal
Display (LCD)
Ribbon cable 
						

							R530EWT
11  –  4
CAUTION:Make sure that no metal pieces enter the gap between
the rotor and the stator of the fan motor because the
rotor is easily 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 disfigure the bracket by touching with the pli-
ers.
8. Remove the fan blade assembly from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
9. Now, the fan blade will be free.
CAUTION:Do not reuse the removed fan blade because the hole
(for shaft) may be larger than normal.
2. REINSTALLATION
1. Install the fan blade to the fan motor shaft according to the following
procedure.2. Hold the center of the bracket which supports the shaft of the fan
motor on the flat table.
3. Apply the screw lock tight into the hole (for shaft) of the fan blade.
4. 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 disfigured.
Make sure that the fan blade rotates smooth after
installation.
Make sure that the axis of the shaft is not slanted.
5. Install the fan motor assembly to the oven cavity back plate with
two (2) screws. 
6. Connect the wire leads to the magnetron and fan motor, referring to
the pictorial diagram.
[11] DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from the switches.
5. Remove two (2) screws holding latch hook to oven flange.
6. Remove latch hook assembly from oven flange.
7. Push outward on the two (2) retaining tabs holding switch in place.
8. Switch is now free. At this time switch lever will be free, do not lose it.2. REINSTALLATION
1. Re-install each switch in its place. The secondary interlock/ monitor
switches are in the lower position and the door sensing switch is in
the upper position.
2. Reconnect wire leads to each switch. Refer to pictorial diagram.
3. Secure latch hook (with two (2) mounting screws) to oven flange.
4. Make sure that the monitor switch is operating properly and check
continuity of the monitor circuit. Refer to chapter “Test Procedure”
and Adjustment procedure.
[12] DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
ADJUSTMENT
1. Adjustment
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
If the door sensing switch, secondary interlock switch and monitor
switch do not operate properly due to a misadjustment, the following
adjustment should be made.
4. Loosen the two (2) screws holding latch hook to the oven cavity
front flange.5. With door closed, adjust latch hook by moving it back and forth,
and up and down. In and out play of the door allowed by the upper
and lower position of the latch hook should be less than 0.5mm.
The vertical position of the latch hook should be adjusted so that
the door sensing switch and secondary interlock switch are acti-
vated with the door closed. The horizontal position of the latch hook
should be adjusted so that the plunger of the monitor switch is
pressed with the door closed.
6. Secure the screws with washers firmly.
7. Check the operation of all switches. If each switch has not activated
with the door closed, loosen screw and adjust the latch hook posi-
tion.
Gap
Rotor Bracket StatorGroove joint pliers
Coil
Shaft
Axis
Stator
Rotor
These are the positions
that should be pinched
with pliers.
Shaft
Table
Center of
bracket
Rear ViewSide View 
						

							R530EWT
11  –  5 2. After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in the
latched position. First check upper position of latch hook, pushing
and pulling upper portion of door toward the oven face. 
Then check lower portion of the latch hook, pushing and pulling
lower portion of the door toward the oven face. Both results (play in
the door) should be less than 0.5mm.
2. The door sensing switch and secondary interlock switch interrupt
the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage around
door with an approved microwave survey meter. (Refer to Micro-
wave Measurement Procedure.)
                          Figure C-3. Latch Switch Adjustments
[13] DOOR REPLACEMENT
1. REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the gap
between the choke cover and door frame as shown in Figure C-4 to
free engaging parts.
4. Pry the choke cover by inserting a putty knife as shown Figure C-4.
5. Release choke cover from door panel.
6. Now choke cover is free.
NOTE:When carrying out any repair to the door, do not bend or
warp the slit choke (tabs on the door panel assembly) to
prevent microwave leakage.
                               Figure C-4. Door Disassembly
7. Slide latch head upward and remove it from door frame with releas-
ing latch spring from door frame and latch head.
8. Now, latch head and latch spring are free.
9. Release door panel from tweleve (12) tabs of door frame.
10.Now, door panel with sealer film is free.
11. Tear sealer film from door panel.
12.Now, door panel is free.
13.Remove door screen from door frame.
14.Now, door screen is free.
2. REINSTALLATION
1. Reinstall door screen to door frame.
2. Put sealer film on door panel. Refer to “Sealer Film” about how to
handle new one.
3. Reinstall door panel to door frame by fitting tweleve (12) tabs of
door frame to tweleve (12) holes of door panel.
4. Reinstall the latch spring to the latch head. Reinstall the latch
spring to the door frame. Reinstall latch head to door frame.
5. Catch two (2) pins of door panel on two (2) hole of upper and lower
oven hinges as shown Figure C-5.6. Reinstall choke cover to door panel by pushing
NOTE:After any service to the door;
1)Make sure that door sensing switch and secondary interlock
switch are operating properly. (Refer to chapter “Test Proce-
dures”.).
2)An approved microwave survey meter should be used to
assure compliance with proper microwave radiation emission
limitation standards.
3. After any service, make sure of the following:
1. Door latch heads smoothly catch latch hook through latch holes
and that latch head goes through center of latch hole.
2. Deviation of door alignment from horizontal line of cavity face plate
is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity face plate.
4. Check for microwave leakage around door with an approved micro-
wave 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 (conden-
sation)-tight or light-tight. Therefore, occasional appear-
ance 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. 
           Figure C-5. Door Replacement
Door Sensing
Switch
Monitor Switch
Switch Lever
Secondary Interlock
Switch
Latch Heads
Door
Door FramePutty Knife Choke Cover
Pin
PinUpper oven hinge
Lower
oven
hingeLower
oven hinge
Choke cover Door
assembly