Sharp R930cs Service Manual

							29
R-930CS
(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 Sensor
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 150ûC (302ûF), 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 difference
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 operational amplifier.
(3) Detector Circuit of Absolute Humidity Sensor Circuit
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 AN6 terminal.
ABSOLUTE HUMIDITY SENSOR CIRCUIT
With this voltage 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 R50-1. Changing the
resistance values results in that there is the same potential
at both F-3 terminal of the absolute humidity sensor and
AN7 terminal of the LSI.  The voltage of AN6 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 the bridge circuit is deviated to increase the
voltage available at AN6 terminal of the LSI.
Then the LSI observes that voltage at AN6 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 operation
automatically.
When the LSI starts to detect the initial voltage at AN6
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
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
C
S
R3R1
R2+
-
Operational
amplifier
Output
voltage
S : Thermistor
     open vessel
C : Thermistor
      closed vessel
2Absolute humidity (g/m  )
Output voltage
Absolute humidity vs,
output voltage characteristic

SW2 SW1
SW3
SW4
SW5P30
P31
P32
P33
P34
 LSI
(IC1)
AN7
AN6
620k
300k
150k
75k
37.4k
464
563
6
7
862
61
60
35
26
47k 47k
10k
0.01µF0.015µF0.01µF
360k
+
-
1
12
VA : -15V
VA : -15V
R519
S
F-2
101.8k
F-1
F-3C11
3.57k
3.32k
VC : -5V
0.1
µF
C. Thermistor in 
    closed vesssl
S. Thermistor in
    open vessel
IC2(IZA495DR)
Ventilation
openings
View of sensor case removedSensing part 
(Open vessel)
Sensing part 
(Closed vessel)
Sensing part 
(Open vessel)Sensing part 
(Closed vessel)
Cross section viewSensor 
case Thermistor
elementThermistor
element 
						

							30
R-930CS
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits.
When handling these parts, the following precautions should
be strictly followed. CMOS LSI have extremely high imped-
ance at its input and output terminals. For this reason, it is
easily influenced by the surrounding high voltage power
source, static electricity charge in clothes, etc. and some-
times 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 all 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. Shapes of Electronic Components
3. 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 external power
source.
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MI-
CROWAVE 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 trans-
former.
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 trans-
former.
4) Re-install the outer case (cabinet).
approx. 1M ohm
ECB
ECB
TOUCH CONTROL PANEL SERVICING
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 canÕt
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 long enough that they
may be separated from each other. For those models, 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
activates an operational state that is equivalent to the oven
door being closed. As for the sensor-related controls of the
touch control panel, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls are
used.
(2) Servicing the touch control panel with power supply
from an external 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 activates an
operational state that is equivalent to the oven door being
closed. Connect an external 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).
4. Servicing Tools
Tools required to service the touch control panel assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a grounding
terminal.)
2) Oscilloscope: Single beam, frequency range: DC-10MHz
type or more advanced model.
3) Others: Hand tools
5. 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 connectors 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 terminals.
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.
Transistor
2SB910MTransistor
DTA123ES
KRA101M
KRA223M
KRC243M 
						

							31
R-930CS
To remove the outer case, proceed 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 cabinet using a T20H Torx type or GTXH20-100
screw driver.4. Remove the remaining two (2) screws from rear and one
(1) screw along the right side of outer case.
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 VOLTAGE:
OUTER CASE REMOVAL
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
To prevent an electric shock, take the following pre-
cautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. DonÕt 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, High voltage transformer,
Oven cavity and Heating element.
WARNING FOR WIRING
1. Disconnect the power supply cord.
2. Make sure that a definiteÓ clickÓ 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 ÒclickÕ 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
operating 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.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Moveable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, Open
button, Convection motor, Convection fan,
Convection fan belt, Pulley, Turntable motor, Damper
motor, Damper door assembly.
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.
Please refer to ÔOVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTSÕ, when carrying out any of
the following removal procedures: 
						

							32
R-930CS
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 high voltage wire leads and rectifier
HIGH VOLTAGE CAPACITOR REMOVAL HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL
5. Disconnect the rectifier assembly from the capacitor and
magnetron.
CAUTION: WHEN REPLACING THE SILICON RECTIFIER
ASSEMBLY, THE GROUND SIDE TERMINAL
MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW. 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. Remove one (1) screw holding the rectifier assembly to
the capacitor holder.
MAGNETRON 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 filament lead of transformer from magnetron.
5. Disconnect high voltage wire lead from magnetron.
6. Carefully remove four (4) mounting screws hold the
magnetron to waveguide, when removing the screws
holding the magnetron to prevent it from falling.7. Remove the magnetron from the unit with care so the
magnetron tube should not hit by any metal object
around the tube.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS
ARE TIGHTENED SECURELY. 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 filament leads of transformer from the
magnetron and capacitor.
5. Disconnect high voltage lead of capacitor from the
transformer.
6. Disconnect wire leads from the transformer.
7. Remove two (2) screws holding the transformer to the
base cabinet.
Re-install
1. Rest the transformer on the base cabinet with its primary
terminals toward rear cabinet.
2. Insert the two edges of the transformer into two metal
tabs of the base cabinet.3. Make sure the transformer is mounted correctly to the
corners underneath those tabs.
4. After re-installing the transformer, secure the transformer
with two screws to the base cabinet, one is with outer
tooth washer and the other is without outer-tooth washer.
5. Re-connect the wire leads (primary and high voltage)
and high voltage lead to the transformer and filament
leads of transformer to the magnetron and capacitor,
referring to the ÒPictorial DiagramÓ.
6. Re-install the outer case and check that the oven is
operating properly.
NOTE HOT (ORANGE) WIRE MUST BE CONNECTED
TO THE POWER TRANSFORMER TERMINAL
NEAREST TO THE TRANSFORMER MOUNTING
SCREW.
assembly from high voltage capacitor and magnetron.
5. Disconnect filament lead of transformer from high voltage
capacitor.
6. Disconnect high voltage wire lead of capacitor from
transformer.
POWER TRANSFORMER REMOVAL
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CA-
PACITOR 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.
Special screw
Screw Driver
(Type: TORX T20 H or 
GTXH20-100) 
						

							33
R-930CS
1. Disconnect the power supply cord.
2. Remove the turntable tray, and the turntable support out
of the oven cavity.
3. Turn the oven upside down and remove one (1) screw
holding the turntable motor cover to the base plate and
take off the turntable motor cover.
TURNTABLE MOTOR REMOVAL
4. Disconnect wire lead from the turntable motor.
5. Remove the two (2) screws holding the turntable motor
and coupling mounting plate to the oven cavity bottom.
6. Turntable motor, Coupling mounting plate and Thermal
protection plate bottom will be free.
DAMPER ASSEMBLY 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 wire leads from damper motor and damper
switch.
5. Remove two (2) oven side screws holding damper motorangle to thermal protection plate (right).
6. Damper assembly is free.
7. Remove one (1) screw holding damper motor to damper
motor angle and one (1) screw holding damper switch to
damper motor angle.
8. Damper motor and switch are free.
OVEN LAMP AND LAMP SOCKET REMOVAL
Figure C-3. Oven lamp socket
POSITIVE LOCK¨  CONNECTOR (NO-CASE TYPE) 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. Push the lever of positive lock
¨ connector.
5. Pull down on the positive lock¨ connector.
CAUTION: WHEN YOU CONNECTING THE POSITIVE
LOCK
¨ CONNECTORS TO THE TERMINALS,
INSTALL THE POSITIVE LOCK¨ SO THAT
THE LEVER FACES YOU.
Figure C-2.  Positive lock
¨connector
CONVECTION MOTOR 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 wire leads from the convection motor.
5. Remove the convection fan belt.
6. Remove two (2) screws holding the convection motormounting angle to the heater duct and base cabinet.
7. Take out the convection motor assembly from the unit.
The convection motor assembly is now free.
8. Remove two (2) screws and nuts holding the motor to
mounting angle.
9 Remove pulley (M) from the motor shaft. Convection
motor is now free.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
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. Bend the tab of the air guide holding the lamp socket.
5. Lift up the oven lamp socket.
6. 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.
7. Now, the oven lamp socket is free. 7. Remove one (1) screw and washer holding the rectifier
from the capacitor holder.
8. Remove one (1) screw holding the capacitor holder tothe rear cabinet.
9. Remove the capacitor from the holder.
Terminal
Push
Pull down1
2
Lever Positive lock®
connector 
						

							34
R-930CS
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
To remove the control panel, procedure as follows:
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 connector CN-A, CN-E and CN-F from the
control unit.
5. Disconnect the wire leads from the relays RY1, RY2 and
RY3.
6. Remove one (1) screw holding the control panel back
plate to the chassis support.
7. Remove two (2) screws holding the bottom edge of the
back plate to the cabinet base.
8. Remove one (1) screw holding the back plate to the oven
cavity flange.
9. Lift up and pull the control panel assembly forward.
Replacement of individual component is as follows;CONTROL UNIT AND KEY UNIT
1. Disconnect the wire connector from the control unit.
2. Remove the four (4) screws holding the panel frame to
the back plate.
3. Separate the panel frame and back plate.
4. Remove the three (3) screws holding the control unit to
the panel frame.
5. Lift up the control unit and disconnect the key connector
from the control unit.
6. Now, the control unit and frame assembly are separated.
NOTE; 1. Before attaching a new key unit, remove remaining
adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.
2. When a attaching the key unit to the control
panel frame, adjust the lower edge and right
edge of the key unit to the correct position of the
control panel frame.
3. Stick the key unit firmly to the control panel
frame by rubbing with soft cloth not to scratch.
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 fan motor.
5. Remove one (1) screw holding the fan motor grounding
wire to the air guide (Right).
6. Remove three (3) screws holding the chassis support to
the rear cabinet, waveguide and control panel back plate.
7. Remove the chassis support from the oven.
8. Remove one (1) screw holding the magnetron air guideto the waveguide.
9. Remove the magnetron air guide from the waveguide.
10. Disconnect wire leads from the fan motor.
11.  Release the main harness from the hole of the fan duct.
12.  Release the thermistor harness from the hole of the fan
duct.
13.  Release one (1) tab holding the fan duct to the rear
cabinet.
14.  Release one (1) tab holding the fan duct to the  air guide
(Right).
15. Remove the fan duct assembly from the oven.
Long nose plier
Heating element 
holder
Heating 
element 
FAN MOTOR REMOVAL
THERMISTOR 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 wire leads from H.V. capacitor and remove
four (4) screws holding rear cabinet to bottom plate and
three (3) screws holding to heater unit assembly and two
(2) screws holding steam duct to top of oven cavity.
Disconnect wire leads from power supply cord terminals.
5. Disconnect wire leads from thermistor. Remove two (2)
screws from thermistor.
6. Disconnect wire leads from convection motor, thermal
cut-out and heater element.
7. Remove nine (9) screws holding heater duct to the oven
cavity.
8. Remove two (2) screws holding heater duct to base
cabinet. Release two (2) snap bands holding wire harness
to the thermal cover (convection).
9. The heater unit is now free.
HEATING ELEMENT REMOVAL
10.Remove two (2) screws holding heating element to
heater duct.
11.Loosen two (2) screws holding holders to heater duct
and take heating element out of heating element holders.
12.Heating element is free.
NOTE: After installed the heating element completely,
bent top of the heating element holder to inside
using by long nose pliers as shown following
illustration.
HEATER UNIT ASSEMBLY REMOVAL
(HEATING ELEMENT/CONVECTION FAN/CONVECTION MOTOR/THERMISTOR) 
						

							35
R-930CS
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH 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. Remove the control panel assembly, refer to Control
Panel Removal.
5. Disconnect wire leads from each of the switches and
fuse holder.
6. Remove two (2) screws holding latch hook to oven
flange.
7. Remove latch hook assembly from oven flange.
8. Push outward on the one (1) stopper tabs holding each
of switches place.
9. Switch is now free.At this time switch lever will be free, do not lose it.
Re-install
1. Re-install switch lever and each interlock switch in its
place. The secondary interlock switch is in the lower
position and the door sensing switch is in the upper
position and the monitor switch is in the middle position.
2. Re-connect wire leads to each switches and fuse holder.
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.
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
16.Remove the fan blade from the fan motor shaft according
the following procedure.
17.Hold the edge of the rotor of the fan motor by using a pair
of grove joint pliers.
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
pliers.
18.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
19. 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.
20.Remove the two (2) screws and nuts holding the fan
motor to the fan duct.
21.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws and nuts.
2. Install the fan blade to the fan motor shaft according the
following procedure.3. Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
4. Apply the screw lock tight into the hole (for shaft) of the
fan blade.
5. 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.
6. Reset the fan duct assembly to its place.
7. Install the tabs of fan duct to the rear cabinet and air
guide.
8. Install the magnetron air guide with the one (1) screw.
9. Reinstall the main harness and thermistor harness to
each hole of the fan duct.
10.Reinstall the chassis support to the control panel back
plate, waveguide and rear cabinet with the three (3)
screws.
11.Re-connect the wire leads to the fan motor, referring to
the pictorial diagram.
12.Re-install the fan motor grounding wire to the air guide
(Right) with one (1) screw.
Rear ViewSide View
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
3. Discharge high voltage capacitor.
If the door sensing switch, secondary interlock switch and
monitor switch do not operate properly due to a 
						

							36
R-930CS
RE-INSTALL
RE-INSTALL
LOWER OVEN HINGEUPPER OVEN HINGE
DOOR ASSEMBLY
LATCH
HEADS
DOOR REPLACEMENT AND ADJUSTMENT
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. Remove turntable tray and turntable support from oven
cavity.
5. Remove three (3) screws holding lower oven hinge.
6. Remove the lower oven hinge from oven cavity bottom
flange.
7. Remove door assembly from upper oven hinge on the
oven.
8. Door assembly is now free.
Note: When the individual parts are replaced, refer to
Door Disassembly.
9. On re-installing door, insert the upper oven hinge into the
door hinge pin. Then while holding door in place.
10.Make sure the door is parallel with oven face lines (left
and upper side lines) and door latch heads pass through
latch holes correctly.
11.Insert the lower oven hinge into oven cavity bottom
flange and then engaged the door hinge pin. Then
secure the lower oven hinge firmly with tree (3) mounting
screws.
Note: After any service to the door;
(A) Make sure that door sensing switch and secondary
interlock switch 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
The door can be adjusted by keeping screws of each hinge
loose.
After adjustment, make sure of the following :
1. Door latch heads smoothly catch latch hook throughlatch 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. 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
airtight, moisture (condensation)-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.
DOOR SENSING
SWITCH
MONITOR FUSE
MONITOR SWITCH
SECONDARY
INTERLOCK
SWITCH
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 latch hook should be less than 0.5mm.
6. Secure the screws with washers firmly.
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm at the
latched position.
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 Microwave Measurement Procedure.)
Figure C-4. Latch Switch Adjustments
Figure C-5. Door Replacement and adjustment 
						

							37
R-930CS
Remove door assembly, refer to Door Replacement.
Replacement of door components are as follows:
CHOKE COVER
1. Place door assembly on a soft cloth with latches facing
up.
Note: As the engaging part of choke cover and door panel
are provided at several places, do not force any particular
part.
2. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of door
panel as shown Figure C-6 to free engaging parts.
3. Lift up choke cover.
4. Now choke cover is free from door panel.
DOOR DISASSEMBLY
CHOKE COVERPUTTY KNIFE
FRONTINSIDE
Upper
Lower
Bent
Door
PanelChoke 
cover
1   BENT2   LIFT UP
DOOR PANEL
5. Remove the twelve (12) screws holding the door panel
to the door frame.
NOTE: The one (1) screw of the twelve (12) screws also
holds the earth terminal of the door decoration to the
door frame.
6. Remove the door panel from the door frame. Now the
door panel is free.
DOOR GLASS
7. Remove the two (2) screws holding the thermal plate U
to the door frame.
8. Remove the two (2) screws holding the thermal plate R
to the door frame.
9. Remove the thermal plate U and the thermal plate R from
the door frame.
10.Slide the door glass leftward.
11.Slide the door glass upward.
12.Remove the door glass from the door frame. Now the
door glass is free.
DOOR DECORATION AND DOOR FRAME
13.Straighten all tabs of the door decoration.
14.Remove the door decoration from the door frame.
15.Now the door decoration and door frame are free.
Figure C-6. Door Disassembly 
						

							38
R-930CS
6
45
12
3
6
45
12
3 A
B
C
D
E
F
G
HA
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
TURNTABLE 
MOTOR
GRY
BRN ORG
GRN
RED BLK
DAMPER 
MOTORCOOLING
FAN 
MOTOR
REDBLK OVEN
THERMAL
CUT-OUT MAGNETRON
TEMPERATURE
FUSE
GRY
IC-1
RED1 2 3 4 5 6
PNK
RED
GRN
WHTPPL1
2
3
4
5
6
7
8
9ORG
RY1 RY2 RY3 CN-FCN-E
CN-ACN-A
N.O.
COM COM
CN-E
ORG
BLK BLKAH SENSOR
RED
WHT 1
2
3CN-F
SECONDARY
INTERLOCK
SWITCH
G
R
Y

CONTROL PANEL
HEATING
ELEMENT MONITOR
SWITCH
CONVECTION MOTOR
POWER SUPPLY CORD
120V 60Hz
GRN
NOTE:
The grounding conductor of 
the power supply cord has 
been grounded by power 
supply cord fixing screw.
The screw must be kept 
allways tight.
NOTE:
The neutral (GRY) wire 
must be connected to 
the terminal with N 
mark on the power 
supply cord.
OVEN LAMP
& SOCKET
N.O.
PNK
N H
G
R
Y

R
E
D
THERMISTOR
1 2
RED
REDRED
RED
MONITOR FUSE
& FUSE HOLDERPNK
MAGNETRONHIGH VOLTAGE COMPONENTS
HIGH VOLTAGE
CAPACITOR HIGH 
VOLTAGE
WIRE B
POWER TRANSFORMER
P
P
L
BLK
WHT
WHT
GRY
ORG
RY6RY4RY5
CN-G
RY1 (COM.)
RY1 (N.O.)
BRN RY2 (COM.)ORG
ORG RY2 (N.O.)
RY3 (COM.)
RED
RED RY3 (N.O.)BRNBRNBRN
PNKGRY
GRY PNK
W
H
TW
H
T
G
R
Y
ORG
NOTE:
Hot (ORG) wire must be connected to the 
power transformer terminal nearest to the 
transformer mounting screw.
DOOR
SENSING
SWITCH
GRNGRN
COM N.C.WHTORG
BRN
T1
COM.
N.O.
COM.
N.O.
COM.
N.O.1 1 3
3 6
2 4 5
1
3
5
7
9
WHTWHT
PNKPNK
DAMPER
SWITCHCOM N.O.
GRY
W
H
T
NOTE:
Hot (YLW & PNK) wire 
must be connected to the 
terminal with blue mark 
on the oven light socket.
GRYPNK
BLUE MARK
REDWHT