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R-3S68
SHARP CORPORATION
SERVICE MANU AL
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
MODEL
R-3S68
S3612R3S68PX/
MICROWAVE OVEN
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION................................................................................................................. 1
WARNING..............................................................................................................................................................1
PRODUCT SPECIFICATIONS ............................................................................................................................. 2
GENERAL INFORMATION....................................................................................................................................2
APPEARANCE VIEW ........................................................................................................................................... 3
OPERATION SEQUENCE.................................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS ..................................................................................................... 5
SERVICING .......................................................................................................................................................... 6
TEST PROCEDURE ............................................................................................................................................. 8
TOUCH CONTROL PANEL .................................................................................................................................14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................... 18
MICROWAVE MEASUREMENT ........................................................................................................................ 24
WIRING DIAGRAM ............................................................................................................................................. 25
PICTORIAL DIAGRAM ....................................................................................................................................... 26
CONTROL PANEL CIRCUIT ...............................................................................................................................27
PRINTED WIRING BOARD .................................................................................................................................28
PARTS LIST ....................................................................................................................................................... 29
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R-3S68
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R-3S68
1
SERVICE MANUAL
PRODUCT SPECIFICATIONS
SHARP CORPORATION
OSAKA, JAPAN
TEST PROCEDURE
SERVICING AND
TROUBLESHOOTING CHART
FUNCTION OF IMPORTANT
COMPONENTS
OPERATING SEQUENCE
APPEARANCE VIEW
MICROWAVE MEASUREMENT
WIRING DIAGRAM
PARTS LIST
TOUCH CONTROL PANEL
ASSEMBLY
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
MICROWAVE OVEN
R-3S68
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the
entire text of this manual, so they will be qualified to render
satisfactory customer service.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM
THE MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.
Service engineers should not be exposed to the microwave
energy which may radiate from the magnetron or other
microwave generating devices if it is improperly used or
connected. All input and output microwave connections,
waveguides, flanges and gaskets must be secured. Never
operate the device without a microwave energy absorbing
load attached. Never look into an open waveguide or
antenna while the device is energized.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained
service engineers.
All the parts marked "*" on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to potentials above
250V.
All the parts marked "∆" on parts list may cause undue
microwave exposure, by themselves, or when they are damaged, loosened or removed.
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PRODUCT SPECIFICATIONS
ITEM DESCRIPTION
Power Requirements 220 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption 1.37kW
Power Output 850 watts nominal of RF microwave energy (IEC 705)
Operating fequency 2450 MHz
Case Dimensions Width 520 mm
Height 305 mm including foot
Depth 389 mm
Cooking Cavity Dimensions Width 348 mm
Height 197 mm
Depth 368 mm
Turntable diameter 325mm
Control Complement Touch Control System
Clock ( 1:00 - 12:59)
Timer (0 - 99 minutes 90 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
HIGH ...............................................Full power throughout the cooking time
MEDIUM HIGH ..................................................approx. 70% of Full Power
MEDIUM .............................................................approx. 50% of Full Power
MEDIUM LOW ....................................................approx. 30% of Full Power
LOW....................................................................approx. 10% of Full Power
TIME pads
AUTO COOK pad
AUTO DEFROST pad
STOP/CLEAR pad
POWER LEVEL /SERVE pad
INSTANT COOK / START pad
Set Weight Approx. 15 kg
GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPOTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
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APPEARANCE VIEW
1. Ventilation openings
2. Oven lamp
3. Door hinges
4. Door safety latches
5. See through door
6. Door seals and sealing
surfaces
7. Coupling
8. Door open button
9. Touch control panel
10.Digital readout
11.Wave guide cover
12.Power supply cord
13.Rating label
14.Earth wire
8
9
10
4
2
7
13
5
3
6
11 4
1
12
14
TOUCH CONTROL PANEL
1
MIN.
1O
MIN.
1O
SEC.
Rice
Congee / Chicken Sour Soup
Porridge
Noodles
Shark's Fin Soup / Beef Soup
Steamed Fish
Dim Sum Delight
Sticky Rice
AUTO
DEFROST
STOP
CLEAR
POWER
LEVEL
INSTANT
COOK
SERVE
START
AUTO
COOK
A1
A2
A3
A4
A5
A6
A7
A8
TIME PADS
Press to enter cooking time or clock
time.
INSTANT COOK / START PAD
Press once to cook for 1 minute at
100% or increase by 1 minute multiples each time this pad is pressed
during cooking.
Press to start oven after setting programmes.
POWER LEVEL / SERVE PAD
Press to set clock.
Press to select microwave power
setting.
If not pressed; 100% is automatically selected.
Press to enter serves after selecting
AUTO COOK menu or pressing the
AUTO DEFROST pad.
AUTO COOK PAD
Press to select AUTO COOK
menu.
AUTO DEFROST PAD
Press to defrost meat.
STOP/CLEAR PAD
Press to clear during programming. Press once to stop operation of oven during cooking; press twice to cancel cooking programme.
AUTO COOK MENUS
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OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches (1st.
latch switch and 2nd. interlock relay control switch).
IMPORTANT
When the oven door is closed, the monitor switch contacts
(COM-NC) must be open.
When the microwave oven is plugged in a wall outlet, rated
voltage is supplied to the point A3+A5 in the control unit.
Figure O-1 on page 25
1. The display flashes
88:88
.
2. To set any programmes or set the clock, you must first
touch the STOP/CLEAR pad.
3. : appears in the display.
NOTE: When the oven door is opened, the oven lamp
comes on at this time.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter a desired cooking time with the touching NUMBER
pad and start the oven with touching START pad.
Function sequence
Figure O-2 on page 25
CONNECTED COMPONENTS RELAY
Oven lamp, Fan motor, Turntable motor RY1
Power transformer RY2
1. Rated voltage is supplied to the primary winding of the
power transformer. The voltage is converted to about 3.3
volts A.C. output on the filament winding and high
voltage of approximately 2000 volts A.C. on the secondary
winding.
2. The filament winding voltage (3.3 volts) heats the
magnetron filament and the high voltage (2000 volts) is
sent to the voltage doubling circuit, where it is doubled to
negative voltage of approximately 4000 volts D.C..
3. The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm. This
energy is channelled through the waveguide (transport
channel) into the oven cavity, where the food is placed to
be cooked.
4. When the cooking time is up, a signal tone is heard and
the relays RY1+RY2 go back to their home position. The
circuits to the oven lamp, power transformer, fan motor
and turntable motor are cut off.
5. When the door is opened during a cook cycle, the
switches come to the following condition
CONDITION
DURING DOOR OPEN
SWITCH CONTACT COOKING (NO COOKING)
1st. latch switch COM-NO Closed Open
2nd. interlock relay
control switch COM-NO Closed Open
Monitor switch COM-NC Open Closed
The circuits to the power transformer, fan motor and
turntable motor are cut off when the 1st. latch switch and
2nd. interlock relay control switch are made open. The
oven lamp remains on even if the oven door is opened
after the cooking cycle has been interrupted, because
the relay RY1 stays closed. Shown in the display is the
remaining time.
6. MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by oven
door, and monitors the operation of the 1st latch switch.
6-1 When the oven door is opened during or after the cycle
of a cooking program, the 1st. latch switch and 2nd.
interlock relay control switch must open their contacts
first.
After that the contacts (COM-NC) of the monitor switch
can be closed.
6-2. When the oven door is closed, the contacts (COM-NC)
of the monitor switch must be opened. After that the
contacts of the 1st. latch switch and 2nd. interlock relay
control switch are closed.
6-3. When the oven door is opened and the contacts of the
1st. latch switch and 2nd. interlock relay remain closed.
The fuse M8A will blow, because the monitor switch is
closed and a short circuit is caused.
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When the microwave oven is preset for variable cooking
power, rated voltage is supplied to the power transformer
intermittently within a 32-second time base through the
relay contact which is coupled with the current-limiting relay.
The following levels of microwave power are given.
SETTING;
32 sec. ON
24 sec. ON
18 sec. ON
12 sec. ON
6 sec. ON
8 sec. OFF
14 sec. OFF
20 sec. OFF
26 sec. OFF
HIGH
MEDIUM HIGH
MEDIUM
MEDIUM LOW
LOW
Approx. 70%
Approx. 50%
Approx. 30%
Approx. 10%
NOTE: The ON/OFF time ratio does not exactly correspond
to the percentage of microwave power, because
approx. 2 seconds are needed for heating up the
magnetron filament.
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FUNCTION OF IMPORTANT COMPONENTS
DOOR OPEN MECHANISM
The door is opened by pushing the open button on the
control panel, refer to the Figure D-1.
When the open button is pushed, the open button pushes up
the switch lever, and then the switch lever pushes up the
latch head. The latch heads are moved upward and released from latch hook. Now the door will open.
LATCH
HEADS
LATCH HOOK
2ND. INTERLOCK
RELAY CONTROL
SWITCH
MONITOR
SWITCH
SWITCH
LEVER
1ST. LATCH
SWITCH
Figure D-1. Door Open Mechanism
1ST. LATCH SWITCH AND 2ND. INTERLOCK RELAY CONTROL SWITCH
1. When the oven door is closed, the contacts COM-NO)
must be closed.
2. When the oven door is opened, the contacts .(COM-NO)
must be opened.
MONITOR SWITCH
1. When the oven door is closed, the contacts (COM-NC)
must be opened.
2. When the oven door is opened, the contacts (COM-NC)
must be closed.
3. If the oven door is opened and the contacts (COM-NO)
of the 1st. latch switch and 2nd. interlock relay fail to
open, the fuse M8A blows simultaneously with closing
the contacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE M8A
TEST THE 1ST. LATCH SWITCH, MONITOR
SWITCH, 2ND. INTERLOCK RELAY, 2ND.
INTERLOCK RELAY CONTROL SWITCH AND
MONITOR RESISTOR FOR PROPER OPERATION.
MONITOR RESISTOR R 0.8Ω 20W
The monitor resistor prevents the fuse M8A bursting when
the fuse M8A blows due to the operation of the monitor
switch.
FUSE M8A
1. The fuse M8A blows when the contacts (COM-NO) of the
1st. latch switch and 2nd. interlock relay remain closed
with the oven door open and when the monitor switch
closes.
2. If the wire harness or electrical components are shortcircuited, this fuse M8A blows to prevent an electric
shock or fire hazard.
THERMAL CUT-OUT TC 145˚C (MG)
This thermal cut-out protects the magnetron against overheating. If the temperature goes up higher than 145˚C
because the fan motor is interrupted, the ventilation openings are blocked, the thermal cut-out will open and the line
voltages to the power transformer will be cut off and the
operation of the magnetron will be stopped.
The defective thermal cut-out must be replaced with new
one.
THERMAL CUT-OUT TC 145˚C (OVEN)
The thermal cut-out located on the top of the oven cavity is
designed to prevent damage to the oven if the foods in the
oven catch fire due to over heating produced by improper
setting of cook time or failure of control unit. Under normal
operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached
within the oven cavity, the oven thermal cut-out will open at
145˚C, causing the oven to shut down. The defective
thermal cut-out must be replace with new one.
THERMAL CUT-OUT 95˚C (FAN MOTOR)
The thermal cut-out protect the fan motor against overheating. If its temperature goes up higher than 95˚C because the
fan motor is locked or the ventilation operating are blocked,
the contacts of the thermal cut-out will open and switch off
the oven. When the oven cools itself down to 75˚C, the
contacts of the thermal cut-out will close again.
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to
rotate the turntable.
FAN MOTOR
The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vanes surrounding
the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted
through the exhausting air vents at the oven cavity
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SERVICING
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the
high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage
rectifier assembly, High voltage harness.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
WARNING: AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
The high-voltage capacitor remains charged about
60 seconds after the oven has been switched off.
Wait for 60 seconds and then short-circuit the connection of the high-voltage capacitor (that is, of the
connecting lead of the high-voltage rectifier) against
the chassis with the use of an insulated screwdriver.
Sharp recommend that wherever possible fault-finding
is carried out with the supply disconnected. It may in,
some cases, be necessary to connect the supply after
the outer case has been removed, in this event carry out
3D checks and then disconnect the leads to the primary
of the power transformer. Ensure that these leads remain isolated from other components and the oven
chassis. (Use insulation tape if necessary.) When the
testing is completed carry out 3D checks and reconnect
the leads to the primary of the power transformer.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components during
testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens should not be run empty. To test for
the presence of microwave energy within a cavity, place
a cup of cold water on the oven turntable, close the door
and set the microwave timer for two (2) minutes. Set the
power level to HIGH and push the START button. When
the two minutes has elapsed (timer at zero) carefully
check that the water is now hot. If the water remains cold
carry out 3D checks and re-examine the connections to
the component being tested.
When all service work is completed, and the oven is fully assembled, the microwave power output should be checked
and microwave leakage test carried out
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the
checks. Many of the possible causes of trouble will require
that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test
Procedure"section.
IMPORTANT: If the oven becomes inoperative because
of a blown fuse M8A in the 1st. latch switch
- 2nd. interlock relay - monitor switch monitor resistor circuit, check the 1st. latch
switch, 2nd. interlock relay, 2nd. interlock
relay control switch, monitor switch and
monitor resistor before replacing the fuse
M8A.
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MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
1ST. LATCH SWITCH
2ND. INTERLOCK RELAY
CONTROL SWITCH
MONITOR SWITCH
MONITOR RESISTOR
THERMAL CUT-OUT 95˚C
THERMAL CUT-OUT 145˚C
FAN MOTOR
TURNTABLE MOTOR
FUSE M8A
TOUCH CONTROL PANEL
TACT SWITCH
RELAY (RY-1, RY-2)
FOIL PATERN ON P.W.B.
POWER SUPPLY CORD
SHORTED WIRE HARNESS
OPENED WIRE HARNESS
OVEN LAMP OR SOCKET
WALL OUTLET
MISADJUSTMENT SWITCH
HOME FUSE OR BREAKER
BLOCKED COOLING FAN
BLOCKED VENTILATION
Home fuse blows when power
supply cord is plugged into wall
outlet.
FUSE M8A blows when power
supply cord is plugged into wall
outlet.
Display does not show anything
when power supply cord is plugged
into wall outlet.
Display does not operate properly when STOP/CLEAR pad is
touched.
Oven lamp does not light at door
opened. (Display appears.)
Oven does not start when the
START pad is touched. (Display
appears)
Oven lamp does not light (Display
appears.)
Fan motor does not operate. (Display appears.)
Turntable motor assembly does
not operate. (Display appears.)
Oven or any electrical parts does
not stop when cooking time is 0 or
STOP/CLEAR pad is touched.
Oven seems to be operating but
little or no heat is produced in
oven load. (Microwave power level
is set at HIGH)
Oven does not seems to be operating properly when MEDIUM
HIGH, MEDIUM, MEDIUM LOW
or LOW is set. (Oven operates
properly at HIGH and when the
STOP/CLEAR pad is touched the
oven stops.)
Oven goes into cook cycle but
shuts down before end of cooking
cycle.
OFF
CONDITION
PROBLEM
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
TEST PROCEDURE
ON
CONDITION
CK = Check / RE = Replace
ABCDE E EG FFH HI KLMN RECKCKRE CK CKCKCK CK
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TEST PROCEDURES
PROCEDURE
LETTER
CARRY OUT 3D CHECK.
Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron
filament terminals, the meter should show a reading of less than 1 ohm.
To test for short filament to anode condition, connect ohmmeter between one of the filament terminals
and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or
zero resistance reading is obtained then the magnetron should be replaced.
MICROWAVE OUTPUT POWER (IEC 705)
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted). Microwave output power from the magnetron can be measured by way of
IEC 705, i.e. it can be measured by using water load how much it can be absorbed by the water load.
To measure the microwave output power in the microwave oven, the relation of calorie and watt is used.
When P(W) heating works for t(second), approximately P x t/4.187 calorie is generated. On the other
hand, if the temperature of the water with V(ml) rises ∆T (°C) during this microwave heating period, the
calorie of the water is V x ∆T.
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL
WHILE THE OVEN IS IN OPERATION.
A MAGNETRON TEST
The formula is as follows;
P x t / 4.187 = V x ∆ T P (W) = 4.187 x V x ∆T / t
Our condition for water load is as follows:
Room temperature..............around 20°C Power supply Voltage.........Rated voltage
Water load.........1000 g Initial temperature...........10±2°C Heating time.........49 sec.
P = 85 x ∆T
Measuring condition:
1. Container
The water container must be a cylindrical borosilicate glass vessel having a maximum material
thickness of 3 mm and an outside diameter of approximately 190 mm.
2. Temperature of the oven and vessel
The oven and the empty vessel are at ambient temperature prior to the start the test.
3. Temperature of the water
The initial temperature of the water is (10±2)°C.
4. Select the initial and final water temperature so that the maximum difference between the final water
temperature and the ambient temperature is 5˚C.
5. Select stirring devices and measuring instruments in order to minimize addition or removal of heat.
6. The graduation of the thermometer must be scaled by 0.1°C at minimum and accurate thermometer.
7. The water load must be (1000±5) g.
8. “t” is measured while the microwave generator is operating at full power. Magnetron filament heatup time is not included.
NOTE:The operation time of the microwave oven is “t + 2” sec. 2 sec. is magnetron filament heat-up time.
Measuring method:
1. Measure the initial temperature of the water before the water is added to the vessel.
(Example: The initial temperature T1 = 11°C)
2. Add the 1 litre water to the vessel.
3. Place the load on the centre of the shelf.
4. Operate the microwave oven at HIGH for the temperature of the water rises by a value ∆ T of
(10 ± 2)˚C.
5. Stir the water to equalize temperature throughout the vessel.
COMPONENT TEST
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
6. Measure the final water temperature. (Example: The final temperature T2 = 21°C)
7. Calculate the microwave power output P in watts from above formula.
Initial temperature .................................................................................................. T1 = 11°C
Temperature after (49 + 2) = 51 sec. ..................................................................... T2 = 21°C
Temperature difference Cold-Warm.................................................................... ∆T1 = 10°C
Measured output power
The equation is “P = 85 x ∆T” ...................................................... P = 85 x 10°C = 850 Watts
JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 85 WATTS REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
1000g
1000g
1000g
T1˚C
T2˚C
Heat up for 51 sec.
B POWER TRANSFORMER TEST
WARNING: High voltages and large currents are present at the secondary winding and filament
winding of the power transformer. It is very dangerous to work near this part when
the oven is on. NEVER make any voltage measurements of the high-voltage
circuits, including the magnetron filament.
CARRY OUT 3D CHECKS.
Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and
secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range,
it is possible to check the continuity of all three windings. The following readings should be obtained:
a. Primary winding ....................approx. 1.4 Ω
b. Secondary winding ...............approx. 98 Ω
c. Filament winding...................less than 1Ω
If the reading obtained are not stated as above, then the power transformer is probably faulty and should
be replaced.
CARRY OUT 4R CHECKS.
C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST
HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS.
Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested
using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high
voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading.
The normal resistance is infinite in one direction and more than 100 kΩ in the other direction.
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TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
B
C
HIGH VOLTAGE RECTIFIER
CARRY OUT 4R CHECKS.
NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE
MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE
OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
D HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 3D CHECKS.
A. Isolate the high voltage capacitor from the circuit.
B. Continuity check must be carried out with measuring instrument which is set to the highest resistance
range.
C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10M Ω after it has
been charged.
D. A short-circuited capacitor shows continuity all the time.
E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance.
F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.
G. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal.
If incorrect reading are obtained, the high voltage capacitor must be replaced.
CARRY OUT
4R CHECKS.
E SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the
following table.
Table: Terminal Connection of Switch
Plunger Operation COM to NO COM to NC
Released O.C. S.C.
Depressed S.C. O.C.
COM; Common terminal,
NO; Normally open terminal
NC; Normally close terminal
S.C.; Short,
O.C.; Open circuit
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT
4R CHECKS.
F THERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a
continuity test across the two terminals as described in the table below.
CARRY OUT 4R CHECKS
.Table: Thermal cut-out Test
Temperature of "ON" condition Temperature of "OFF" condition Indication ofohmmeter
Parts Name (closed circuit) (˚C) (open circuit) (˚C) (When room temperature
is approx. 20˚C)
Thermal cut-out 145˚C This is not resetable type Above 145˚C Closed circuit.
Thermal cut-out 95˚C Below 75˚C Above 95˚C Closed circuit.
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out 145˚C (MG) indicates that the magnetron has overheated, this may be
due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.
An open circuit thermal cut-out 145˚C (OVEN) indicates that the foods in the oven may catch fire, this
may be due to over heating produced by improper setting of the cooking time or failure of the control
panel.
An open circuit thermal cut-out 95˚C (FAN) indicates that the fan motor winding has overheated, this
may be due to blocked ventilation or locked cooling fan.
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PROCEDURE
LETTER
COMPONENT TEST
TEST PROCEDURES (CONT'D)
CARRY OUT 3D CHECKS.
Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check between
the terminals of the monitor resistor.
The resistance of monitor resistor is approx. 0.8 ohms.
If incorrect readings are obtained, replace the monitor resistor.
CARRY OUT 4R CHECKS.
G MONITOR RESISTOR TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor.
Using an ohmmeter, check the resistance between the two terminals as described in the table below.
H MOTOR WINDING TEST
Table: Resistance of Motor
Motors Resistance
Fan motor Approximately 370 Ω
Turntable motor Approximately 16.08 kΩ
If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS
I BLOWN FUSE F M8A
CARRY OUT 3D CHECKS.
1. If the fuse M8A is blown, there could be shorts or ground in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
2. If the fuse M8A is blown when the door is opened, check the 1st. latch switch, 2nd. interlock relay,
2nd. interlock relaycontrol switch, monitor switch and monitor resistor.
If the fuse M8A is blown by incorrect door switching replace the defective switch(s) and the fuse M8A.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE FUSE M8A WITH THE CORRECT VALUE REPLACEMENT.
J TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter.
In this service manual, the touch control panel assembly is in one unit, and troubleshooting by unit
replacement is described according to the symptoms indicated.
1. Tact Switch.
The following symptoms indicate a defective tact switch. Replace the tact switch.
a) When touching the tact switches, a certain tact switch produces no signal at all.
b) When touching the tact switches, sometimes a tact switch produces no signal.
2. Control Panel
The following symptoms may indicate a defective control unit. Before replacing the control unit,
perform the tact switch test (Procedure K) to determine if control unit is faulty.
2-1 In connection with tact switches.
a) When touching the tact switches, a certain group of tact switches do not produce a signal.
b) When touching the tact switches, no tact switches produce a signal.
Page 14
R-3S68
12
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Cooking is not possible.
K TACT SWITCH TEST
If the display fails to clear when the STOP/CLEAR tact switch is depressed, first verify that the door
sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed
and open when the door is open. If the door sensing switch (stop switch) is good, make sure the door
sensing switch is closed (either close the door or short the door sensing switch connecter). Use the tact
switch matrix indicated on the control panel schematic and place a jumper wire between the pins that
correspond to the STOP/CLEAR tact switch making momentary contact. If the control unit responds by
clearing with a beep, the tact switch is faulty and must be replaced. If the control unit does not respond,
it is a faulty and must be replaced. If a specific pad does not respond, the above method may be used
(after clearing the control unit) to determine if the control unit or tact switch is at fault.
SW1
10
MIN.
AUTO COOK
AUTO DEFROST
INSTANT
COOK
START
1
MIN.
10
SEC.
STOP
CLEAR
SW2
SW3
SW4
SW6
SW7
SW5
SW8
POWER
LEVEL
SERVE
L RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 3 and 5 of the 3 pin connector (A) on the
control unit with an A.C. voltmeter.
The meter should indicate 220 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking or convection cooking
operation.
DC. voltage indicated.................... Defective relay.
DC. voltage not indicated . ............ Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 APPROX. 19.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 APPROX. 18.0V D.C. Power transformer
CARRY OUT 4R CHECKS.
Page 15
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13
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
NOTE: At the time of these repairs, make a visual
inspection of the varistor for burning
damage and examine the transformer
with tester for the presence of layer shortcircuit (check primary coil resistance). If
any abnormal condition is detected,
replace the defective parts.
CARRY OUT 4R CHECKS.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given
below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
STEPS OCCURANCE CAUSE OR CORRECTION
1 The rated voltage is not applied to POWER Check supply voltage and oven main unit.
terminal of CPU connector (CN-A).
2 The rated voltage is applied to primary side Low voltage transformer or secondary circuit defective.
of low voltage transformer. Check and repair.
3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
(CARRY OUT
3D CHECKS BEFORE REPAIR)
4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
(CARRY OUT 3D CHECKS BEFORE REPAIR)
RY2
RY1
2
(J1)
CN - A
D22
VRS1
LEAD
WIRE
LEAD WIRE
GREEN
1
3
5
POWER OL TTM
b
a
c
d
M PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
Page 16
14
R-3S68
Control Unit
Control unit consists of tact switches, LSI, power source
circuit, synchronizing signal circuit, ACL circuit, buzzer
circuit and indicator circuit.
1) Tact Switches
The tact switches are composed of a matrix, signals
generated in the LSI are sent to the tact switches through
R61-R63. When a tact switches is touched, a signal is
completed through the tact switches and passed back to
the LSI through R81-R83 to perform the function that
was requested.
2) LSI
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit.
Symbol Voltage Application
VC -5V LSI(IC1)
4) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
5) ACL Circuit
A circuit to generate a signals which resets the LSI to the
initial state when power is supplied.
6) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
noticing sounds (key touch sound and completion sound).
7) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
8) Relay Circuit
To drive the magnetron, fan motor, turntable motor and
light the oven lamp.
9) Indicator Circuit
Indicator element is a Light-emitting diode.
Basically, a Light-emitting diode is triode having a cathode
and an anode.
The Light-emitting diode has 4-digits, 9-segments are
used for displaying figures.
Page 17
15
R-3S68
1 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
2 XIN IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XIN terminal.
3 RESET IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set to “L” level the moment power is supplied, at this time the LSI is set. Thereafter set
at “H” level.
4 R70 OUT Segment data signal.
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal period, and
input to the anode of the light -emitting diode.
5 PULSE OUT Signal to sound buzzer.
A: key touch sound(0.12 sec.).
B: Completion sound(2.4 sec.).
6 R72 OUT Digit selection signal.
Refer to the touch control panel circuit about the relation between signals and digits.
Normally, one pulse is output in every synchronized signal period, and input to the light
-emitting diode.
7-9 R40-R42 OUT Digit selection signal.
Refer to the touch control panel circuit about the relation between signals and digits.
Normally, one pulse is output in every synchronized signal period, and input to the light
-emitting diode.
10 AIN3 IN Terminal to change cooking constant.
11 R50 OUT Segment data signal.
Signal similar to R70.
12-13 R51-R52 OUT Segment data signal.
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal period, and
input to the anode of the light -emitting diode.
14 VSS IN Connected to VC.
15 R53 OUT Segment data signal.
Signal similar to R70.
16 R60 OUT Segment data signal.
Signal similar to R70.
17 R61 OUT Segment data signal.
Signal similar to R70.
Switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81, R82 and R83
terminal while one of diode D56 line switches on switch matrix is touched.
18 R62 OUT Segment data signal.
Signal similar to R70.
Switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81, R82 and R83
terminal while one of diode D57 line switches on switch matrix is touched.
DESCRIPTION OF LSI
LSI(IZA677DR)
The I/O signal of the LSI(IZA677DR) is detailed in the following table.
Pin No. Signal I/O Description
Page 18
16
R-3S68
Pin No. Signal I/O Description
19 R63 OUT Segment data signal.
Signal similar to R70.
Switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81, R82 and R83
terminal while one of diode D58 line switches on switch matrix is touched.
20 INT2 IN Signal synchronized with commercial source frequency(50Hz).
This is basic timing for time processing of LSI.
21 R81 IN Signal coming from touch tact switch.
When either one of resistor R80 line switches on switch matrix is touched, a
corresponding signal out of R61-R63 will be input into R81. When no key is touched,
the signal is held at "L" level.
22 R82 IN Signal coming from touch tact switch.
When either one of resistor R81 line switches on switch matrix is touched, a
corresponding signal out of R61-R63 will be input into R82.
23 R83 IN Signal coming from touch tact switch.
When either one of resistor R82 line switches on switch matrix is touched, a
corresponding signal out of R61-R63 will be input into R83.
24 R90 OUT Terminal not used.
25 R91 OUT Oven lamp, turntable motor and cooling fan motor driving signal. (Square
Waveform : 50Hz)
To turn on and off the control relay. The pulse signal (50Hz) is delivered to the control
relay driving circuit and cook relay control circuit.
26 R92 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power operation, the signals holds “L” level
during microwave cooking and “H” level while not cooking. In other cooking modes
(10%, 30%, 50%, 70%) the signal turns to “H” level and “L” level in repetition according
to the power level.
27 KE0 IN Input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal.
Door opened; “L” level signal.
28 VDD IN Connected to GND.
Page 19
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R-3S68
SERVICING
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 impedance 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 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 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 MICROWAVE OVEN IS STILL LIVE DURING SERVICING PRESENTS A HAZARD.
Therefore, when checking the performance of the touch
control panel, put the outer cabinet on the oven to avoid
touching the high voltage transformer, or unplug the
primary terminal (connector) of the high voltage transformer to turn it off; the end of such connector must be
insulated with an insulating tape. After servicing, be sure
to replace the leads to their original locations.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that the
two can’t 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, 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 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 brings
about 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 sensorrelated 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) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
3) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
4) Be sure to use specified components where high precision is required.
approx. 1M ohm
E
C
B
3
2
1
IC
LM7905CT
Transistor
KRA101M
KRA222M
KRA223M
KRC243M
Page 20
18
R-3S68
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or 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.
1. Disconnect oven from power supply.
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
operating the oven.
Do not operate the oven if any of the following conditions
exist;
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
OUTER CASE REMOVAL
To remove the outer case proceed as follows.
1. Disconnect oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the six (6) screws from rear and along the right
side edge of case.
4. Slide the entire case back about 3cm to free it from
retaining clips on the cavity face plate.
5. Lift the entire case from the unit.
6. Discharge the H.V. capacitor before carrying out any
further work.
7. Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 6 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENT
OR WIRING.
MAGNETRON REMOVAL
4. Re-install 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
Figure C-1. Magnetron replacement
WAVEGUIDE
FLANGE
SCREWS
MAGNETRON
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from magnetron.
3. Remove the two (2) screws holding chassis support to
oven cavity front plate and magnetron.
4. Remove the chassis support from oven.
5. Carefully remove the two (2) screws holding magnetron
to waveguide flange.
6. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
7. Now, the magnetron is free.
Re-install
1. Re-install the magnetron to waveguide flange with the
two (2) screws diagonally as shown in Figure C-1.
2. Re-install the chassis support to oven cavity front plate
and magnetron with the two (2) screws.
3. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
POWER TRANSFORMER REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from power transformer,
magnetron and capacitor terminals.
3. Remove four (4) screws holding transformer to bottom
plate right.
4. Remove transformer from bottom plate right.
5. Remove the one (1) terminal insulator from filament lead
(longer one) of power transformer.
Page 21
19
R-3S68
Re-install
1. Insert tube into filament lead (longer one) of power
transformer.
2. Install the terminal insulator to receptacle of filament
lead (longer one) of power transformer.
3. Rest transformer on the bottom plate right with its primary
terminals toward the oven face plate.
4.
Secure transformer with four screws to bottom plate right.
5. Re-connect wire leads (primary and high voltage) to
power transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM".
6. Re-install outer case and check that oven is operating
properly.
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 illustrated
below.
RECEPTACLE
COVERS
Terminal
insulator
Flat type
screw driver
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
7. Disconnect wire leads from capacitor and remove
capacitor holder.
8. Now, high voltage capacitor is free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH VOLTAGE
RECTIFIER MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage wire of the high voltage
rectifier assembly from the magnetron.
3. Remove one (1) screw holding capacitor holder to oven
cavity rear plate.
4. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
5. Disconnect rectifier terminal from capacitor.
6. Now, high voltage rectifier assembly is free.
POSITIVE LOCK® CONNECTOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock® connector.
3. Pull out the positive lock® connector.
CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-
NECT THE POSITIVE LOCK® CONNECTORS
TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACE
YOU (SERVICE ENGINEERS).
Figure C-2. Positive lock® connector
Terminal
Push
Pull down
1
2
Lever
Positive lock®
connector
CONTROL PANEL ASSEMBLY REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from panel components.
3. Release one (1) nail holding the control panel assembly
to the oven flange.
4. Remove control panel assembly and slide upward.
5 . Now, individual components can be removed.
NOTE: 1. Before attaching a new key sheet, wipe off
remaining adhesive on the control panel frame
surfaces completely with a soft cloth soaked in
alcohol.
2. When attaching the key sheet to the control panel
frame, adjust the upper edge and right edge of
the key sheet to the correct position of control
panel frame.
3. Stick the key sheet firmly to the control panel
frame by rubbing with soft cloth not to scratch.
Page 22
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R-3S68
TURNTABLE MOTOR REMOVAL
Coil
Gap
Rotor
Bracket
Stator
Groove joint pliers
Shaft
Axis
Stator
These are the position
where should be
pinched with pliers
Rotor
Side ViewRear View
Shaft
Table
Center of
bracket
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 corner.
4. Where the corners have been snipped off bend corner
areas 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. Now the turntable motor is free.
8. After replacement use the one (1) screw to fit the
turntable motor cover.
NOTE: The one (1) screw to fit the turntable motor cover
should be XOTSD40P12000, XOTSD40P10000 or
XOTSD40P08000.
COOLING FAN MOTOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the fan motor, thermal
cut-out (FAN) and magnetron.
3. Remove two (2) screws holding the chassis support to
oven cavity front plate and magnetron. And remove
chassis support.
4. Remove two (2) screws holding the magnetron to
waveguide flange. And remove the magnetron.
5. Remove one (1) screw holding the fan duct assembly to
oven cavity.
6. Release the fan duct assembly from the oven cavity.
7. Remove one (1) screw holding the thermal cut-out angle
to the fan motor.
8. Remove the fan blade from the fan motor shaft according
the following procedure.
1) Hold the edge of the rotor of the fan motor by using a pair
of grove joint pliers.
CAUTION:
* Make sure that any pieces do not 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.
2) Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
3) Now, the fan blade will be free.
CAUTION:
* Do not use this removed fan blade again because the
hole (for shaft) of it may become bigger than a
standard one.
9. Remove the two (2) screws holding the fan motor to the
fan duct.
10.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws.
2. Install the fan blade to the fan motor shaft according the
following procedure.
1) Hold the centre of the bracket which supports the shaft
of the fan motor on the flat table.
2) Apply the screw lock tight into the hole (for shaft) of the
fan blade.
3) 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.
3. Install the thermal cut-out angle to the fan motor with one
(1) screw.
4. Catch two holes of fan duct on two tabs of the waveguide
flange.
5. Install the fan duct assembly to the oven cavity with the
one (1) screw.
6. Install the magnetron to waveguide flange with two (2)
screws.
7. Install one (1) tab of the chassis support to oven cavity
front plate and install another tab of it to rear plate. And
then screw chassis support to oven cavity front plate and
magnetron with two (2) screws.
8. Connect the wire leads to the fan motor, magnetron and
thermal cut-out (FAN), referring to the pictorial diagram.
Page 23
21
R-3S68
OVEN LAMP AND LAMP SOCKET REMOVAL
Figure C-3. Oven lamp socket
1. CARRY OUT 3D CHECKS.
2. 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.
3. Bend the tab of the oven cavity holding the lamp socket.
4. Lift up the oven lamp socket.
5. Now, the oven lamp socket is free.
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from the switches.
3. Remove two (2) screws holding latch hook to oven
flange.
4. Remove latch hook assembly from oven flange.
5. Push outward on the two (2) retaining tabs holding each
switch in place.
6. Switches are now free. At this time switch lever will be
free, do not lose it.
Re-install
1. Re-install each switch and switch lever in its place.
The 1st. latch switch and monitor switch are in the lower
position and 2nd. interlock relay control switch is in the
upper position.
2. Re-connect 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.
Removal
1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the green/yellow wire
to the bottom plate right.
3. Disconnect the brown wire lead of the power supply cord
from the fuse holder.
4. Cut away the connector.
5. Release the power supply cord from the rear cabinet.
6. Now, the power supply cord is free.
Re-install
1. Insert the moulding cord stopper of power supply cord
into the square hole of the rear cabinet.
2. Install the earth wire lead of power supply cord to the
bottom plate rirgt with one (1) screw and tight the screw.
3. Connect the brown wire lead of power supply cord to the
fuse holder correctly, referring to the Pictorial Diagram.
4. Strip the blue wire lead of the power supply cord and
white wire lead of the main wire harness for 15mm lengh
from their end.
POWER SUPPLY CORD REPLACEMENT
5. Wind the conductor of the blue wire lead of the power
supply cord and the conductor of the wire lead of the
main wire harness each other.
6. Insert them into the connector. And clamp it.
7. CARRY OUT 4R CHECKS.
15 mm
Connector
CE-230
Blue wire lead of power supply cord
Wire lead of the
main wire harness
Conductor:
Stripped portion
Connector
CE-230
Figure C-4. Power supply cord replacement
1ST. LATCH SWICTH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH REMOVAL
If each switch does not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
1ST. LATCH SWICTH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT
2. 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
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
Page 24
22
R-3S68
latch hook should be adjusted so that the 1st. latch
switch 2nd. interlock relay control switch are activated
with the door closed. The horizontal position of the latch
hook should be adjusted so that the monitor switch is
activated with the door closed.
3. Secure the screws with washers firmly.
4. Check the operation of all switches. If any switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
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 1st. latch switch and 2nd. interlock relay control
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.)
LATCH
HEADS
LATCH HOOK
2ND. INTERLOCK
RELAY CONTROL
SWITCH
MONITOR
SWITCH
SWITCH
LEVER
1ST. LATCH
SWITCH
Figure C-5. Latch Switch Adjustments
Putty Knife
Door frame
Choke Cover
12
11
10
9
8
7
6
5
4
3
2
1
Figure C-6. Door Disassembly
RE-INSTALL
1. Re-install door screen to door frame by fitting two (2) tabs
of door frame to two (2) holes of door screen.
2. Re-install latch spring to the head. Re-install latch spring
to the door frame. Re-install latch head to the door frame.
3. Re-install door panel to door frame by fitting nine (9) tabs
of door frame to nine (9) holes of door panel.
4. Hold the door panel to the door frame with two (2)
screws.
5. Put sealer film on door panel. Refer to "Sealer Film"
about how to handle new one.
6. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
7. Re-install choke cover to door panel by pushing.
DOOR REPLACEMENT
REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of door
frame as shown Figure C-6 to free engaging parts.
4. Try the principles of the lever and lift up the choke cover
by inserting a putty knife as shown Figure C-6.
5. Release choke cover from door panel.
6. Now choke cover is free.
7. Release two (2) pins of door panel from two (2) hole of
upper and lower oven hinges by lifting up.
8. Now, door panel is free from oven cavity.
9. Remove the two (2) screws holding the door panel to the
door frame.
10.Release door panel from nine (9) tabs of door frame by
sliding door panel downward.
11.Now, door panel with sealer film is free.
12.Tear sealer film from door panel.
13.Now, door panel is free.
14.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
15.Now, latch head and latch spring are free.
16.Remove door screen from door frame by releasing two
(2) tabs.
17.Now, door screen is free.
Page 25
23
R-3S68
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.
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 centre 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 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.
UPPER
OVEN HINGE
PIN
DDOR PANEL
CHOKE
COVER
PIN
LOWER
OVEN
HINGE
Figure C-7. Door Replacement
SEALER FILM
Installation
1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-8.
2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel
Sealer film
Backing film
Adhesive tape
Figure C-8. Sealer film
Page 26
24
R-3S68
MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor switch
and door are completed individually or collectively, the
following leakage test must be performed with a survey
instrument and it must be confirmed that the result meets
the requirements of the performance standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from
external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed as
follows;
1. Make sure that the test instrument is operating normally
as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for
instrumentations as prescribed by the performance
standard for microwave ovens must be used for testing.
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275 ± 15ml of water initially at 20 ±
5˚C in the centre of the oven tray. The water container
should be a low form of 600 ml beaker with inside
diameter of approx. 8.5cm and made of an electrically
non-conductive material such as glass or plastic.
The placing of this standard load in the oven is important
not only to protect the oven, but also to insure that any
leakage is measured accurately.
4. Close the door and turn the oven ON with the timer set
for several minutes. If the water begins to boil before the
survey is completed, replace it with 275ml of cool water.
5. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
6. The microwave radiation emission should be measured
at any point of 5cm or more from the external surface of
the oven.
mW cm
2
mW cm
2
Microwave leakage measurement at 5 cm distance
SHARP
Page 27
25
R-3S68
SCHEMATIC
NOTE: CONDITION OF OVEN
1.DOOR CLOSED
2.CLOCK APPEARS ON DISPLAY
NOTE: " " indicates components with potentials above 250V.
Figure O-1. Oven Schematic-OFF Condition
Figure O-2. Oven Schematic-Cooking Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. START KEY TOUCHED
POWER TRANSFORMER
MAGNETRON
H.V. RECTIFIER
CAPACITOR
1.07µ
AC2100V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
145˚(MG)
THERMAL CUT-OUT
95˚C (FAN)
1ST. LATCH
SWITCH
B1
B2
A5
A3
EARTH
BLU
BRN
220 V
˜
50Hz
OL
FM
TTM
N.O.
RY-1
G-Y
COM.
FUSE
M8A
A1
THERMAL
CUT-OUT
145˚C
(OVEN)
RY-2
MONITOR
RESISTOR
0.8/20W
2ND. INTERLOCK RELAY
CONTROL SWITCH
2ND.
INTERLOCK
RELAY
POWER TRANSFORMER
MAGNETRON
H.V. RECTIFIER
CAPACITOR
1.07µ
AC2100V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
145˚(MG)
B1
B2
A5
A3
EARTH
BLU
BRN
OL
FM
TTM
N.O.
RY-1
G-Y
COM.
FUSE
M8A
A1
THERMAL
CUT-OUT
145˚C
(OVEN)
RY-2
MONITOR
RESISTOR
0.8/20W
THERMAL CUT-OUT
95˚C (FAN)
1ST. LATCH
SWITCH
220 V
˜
50Hz
2ND. INTERLOCK RELAY
CONTROL SWITCH
2ND.
INTERLOCK
RELAY
Page 28
26
R-3S68
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
OVEN LAMP
AND SOCKET
COM.
COM.
N.O.
N.C.
2ND INTERLOCK
RELAY CONTROL
SWITCH
1ST
LATCH
SWITCH
TURNTABLE
MOTOR
NOTE:
Live (RED) wire must be
connected to the terminal
with blue mark on the
oven light socket.
CONTROL UNIT
COM.
NO
CN-B
RY2
2
1
GRN
GRY
CN-A
12345
WHT
RED
GRY
ORG
BLK
GRY
GRN
GRY
WHT
GRY
BLK
GRY
BLUE MARK
BLKBLK
THERMAL CUT-OUT
(OVEN)
FAN MOTOR
RED
BLK
WHT
GRY
CN-B
WHT
WHT
GRN
GRN
51
ORG
GRY
GRY
(OVEN SIDE)
WHT
WHT
THERMAL CUT-OUT
(FAN)
BLKRED
THERMAL
CUT-OUT
(MAGNETRON)
WHT
MONITOR
RESISTOR
RED
GRY
RED
BRN
FUSE
M8A
CN-A
WHT
RED
MONITOR SWITCH
BLU
BRN
EARTH
HIGH VOLTAGE COMPONENTS
NEUTRAL
LIVE
G
/
Y
POWER
SUPPLY
CORD
WHT
RED
RED
HIGH
VOLTAGE
CAPACITOR
H.V.
RECTIFIER
MAGNETRON
HIGH VOLTAGE
TRANSFORMER
HIGH VOLTAGE
WIRE B
Page 29
27
R-3S68
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-2. Contrl Panel Circuit
+
–
+–+
–
+
–
+
–
+
–
A3
A5
A1
COM
NO
B1
B2
AC220V
50Hz
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
POWER
TRANSFORMER
DOOR SWITCH
ab
c
d
(J1)
VRS1
10G471K
T1
RY1
RY2
D20
D21
D22
D30
D2
D3
C4
C5
D1 : S1NB10
C1 470µ/16v
C2 47µ/16v
1
23
C11
C10 0.01µ/50v
Q10
KRA101M
Q2
KRA101M
ZD1
HZ4A-2
R10 15k
R1 15k
C3
VC
C6 0.1µ/50v
(J3) (J2)
Q60~63
KRA222M
Q60
Q61
Q62
Q63
R69 3.3k
Q64
KRC101M
VC
C12 0.1µ/50v
CF1
4MHz
Q40
KRA101M
R40 3.3k
SP40
C20
0.1µ/50v
C21
10µ/35v
Q20
KRA101M
Q21
KRC243M
Q22
KRA223M
R20 15k
R31 4.7k
R30 15k
C30 0.1µ/50v
R60 150
R61 150
R62 150
R63 150
R64 150
R65 150
R66 150
R67 150
R68 120
4321abcdef ghi
D58
D57
D56
SW1
10
MIN.
1
MIN.
10
SEC.
AUTO COOK
STOP
CLEAR
SERVE
POWER
LEVEL
AUTO DEFROST
SW2
SW3
SW4
SW5
SW6
SW7
SW8
R80 100k
R81 100k
R82 100k
R53
R60
R61
R62
R63
INT2
R81
R82
R83
R90
R91
R92
KE0
VDD
VSS
PULSE
R52
R51
R50
AIN3
R42
R41
R40
R72
R70
RESET
XIN
XOUT
1
5
10
1415
20
25
28
IC1 IZA677DR
LIGHT EMITTING DIODE
CONTROL UNIT
KEY SHEET
NOTE :
IF NOT SPECIFIED, 1/4w ± 5%
IF NOT SPECIFIED, 1SS270A
IF NOT SPECIFIED, 0.01µF/16v
Q1
LM7905CT
5
1
2
3
4
11ES1 x 2
C4~5
100µ/35v x 2
COOK SERVE CHECK DEF
g
START
INSTANT
COOK
Page 30
28
R-3S68
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-3. Printed Wiring Board
13 1
1
2
, F
Lot No
R60
3
4
5
SW2
SW1
SW3
D57
D58
R63
R62
R61
D56
E
B
Q64
7
8
E
B
Q60
E
E
E
DIP
(J2)
B
B
B
Q61
Q62
Q63
R69
B
E
Q2
ZD1
R1
C3
6
C13
C12
1
R64
R65
R66
R67
R68
R30
9
10
28 15
14
IC1
CF1
11
SW4
12
13
14
(J3)
C6
R10
R20
C15
15
16
17
18
SW5
R80
R81
R82
SW6
SW7
SW8
R31
19
20
21
E
B
Q40
B
E
Q10
C11
C10
C30
22
23
24
25
C14
C8
RY2
2728293031
32
R40
SP40
Q1
33
34
C5
C7
D1
C1
D3
D2
E
Q22
B
C2
C4
C21
Q21
E
B
D20
B
E
Q20
C20
RY1
36
35
D21
12
543
T1
(J1)
CN - A
D22
VRS1
CN - B
2
1
D30
LEAD
WIRE
LEAD WIRE
GREEN
1
3
5
POWER OL TTM FM
26
Page 31
29
R-3S68
PARTS LIST
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
*
*
*
*
∆
ELECTRICAL PARTS
1- 1 QSW-MA110WRE0 1st. latch and 2nd. Iinterlock relay control switches 2 AK
1- 2 QSW-MA111WRE0 Monitor switch 1 AK
1- 3 RV-MZA197WRE0 Magnetron 1 BN
1- 4 RTHM-A080WRE0 Thermal cut-out 145˚C 2 AP
1- 5 FH-DZA047WRK0 High voltage rectifier assambly 1 AQ
1- 6 RC-QZA172WRE0 High voltage capacitor 1 AY
1- 7 RMOTEA265WRE0 Cooling fan motor 1 AZ
1- 8 RTHM-A072WRE0 Thermal cut-out 95˚C 1 AM
1- 9 QACC-A065WRE0 Power supply cord 1 AS
1-10 QFS-CA010WRE0 Fuse (M8A) 1 AE
1-11 QFSHDA019WRE0 Fuse holder 1 AH
1-12 QSOCLA022WRE0 Oven lamp socket 1 AG
1-13 RLMPTA069WRE0 Oven lamp 1 AK
1-14 RMOTDA169WRE0 Turntable motor 1 AW
1-15 RR-WZA003WRE0 Monitor resistor 0.8Ω 20W 1 AG
1-16 RTRN-A480WRE0 Power transformer 1 BP
1-17 QPLGAA018WRE0 AC plug 1 AL
CABINET PARTS
2- 1 GCABUA522WRT0 Outer case cabinet 1 AT
2- 2 FDAI-A171WRY0 Bottom plate right 1 AT
2- 3 GDAI-A261WRW0 Bottom plate left 1 AP
2- 4 GLEGPA019WRE0 Foot 4 AD
CONTROL PANEL PARTS
3- 1 CPWBFA687WRK0 Control unit 1 BH
3- 1A QCNCMA234DRE0 3-pin connector (A) 1 AC
3- 1B QCNCMA275DRE0 2-pin connector (B) 1 AB
C1 VCEAB31CW477M Capacitor 470uF 16V 1 AB
C2 VCEAB31CW476M Capacitor 47uF 16V 1 AA
C3 VCKYD11CY103N Capacitor 0.01uF 16V 1 AH
C4-5 VCEAB31VW107M Capacitor 100uF 35V 2 AB
C6 RC-KZA132DRE0 Capacitor 0.1uF 50V 1 AC
C10 VCTYF31HF103Z Capacitor 0.01uF 50V 1 AB
C11 VCKYD11CY103N Capacitor 0.01uF 16V 1 AH
C12 RC-KZA132DRE0 Capacitor 0.1uF 50V 1 AC
C20 VCEAB31HW104M Capacitor 0.1uF 50V 1 AM
C21 VCEAB31VW106M Capacitor 10uF 35V 1 AB
C30 RC-KZA132DRE0 Capacitor 0.1uF 50V 1 AC
CF1 RCRS-A012DRE0 Ceramic resonator (CST4.00MGW) 1 AD
D1 RSRCDA013DRE0 Diode bridge (S1NB10) 1 AG
D2-3 VHD11ES1///-1 Diode (11ES1) 2 AB
D20-22 VHD1SS270A/-1 Diode (1SS270A) 3 AA
D30 VHD1SS270A/-1 Diode (1SS270A) 1 AA
D56-58 VHD1SS270A/-1 Diode (1SS270A) 3 AA
IC1 RH-IZA677DRE0 LSI 1 AN
LED VHPSL3965T/1B Light emitting diode (SL-3965T-01) 1 AV
Q1 RH-IZA401DRE0 Integrated circuit (LM7905CT) 1 AE
Q2 VSKRA101M//-3 Transistor (KRA101M) 1 AB
Q10 VSKRA101M//-3 Transistor (KRA101M) 1 AB
Q20 VSKRA101M//-3 Transistor (KRA101M) 1 AB
Q21 VSKRC243M//-3 Transistor (KRC243M) 1 AB
Q22 VSKRA223M//-3 Transistor (KRA223M) 1 AB
Q40 VSKRA101M//-3 Transistor (KRA101M) 1 AB
Q60-63 VSKRA222M//-3 Transistor (KRA222M) 4 AB
Q64 VSKRC101M//-3 Transistor (KRC101M) 1 AB
R1 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA
R10 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA
R20 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA
R30 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA
R31 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA
R40 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA
R60-67 VRD-B12EF151J Resistor 150 ohm 1/4W 8 AA
R68 VRD-B12EF121J Resistor 120 ohm 1/4W 1 AA
R69 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA
R80-82 VRD-B12EF104J Resistor 100k ohm 1/4W 3 AA
RY1 RRLY-A078DRE0 Relay (OJ-SH-118LM) 1 AG
RY2 RRLY-A083DRE0 Relay (OMIF-S-118LM) 1 AK
SP40 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG
SW1-8 QSW-PA016DRE0 Tact switch (SKHVBD) 8 AB
Page 32
30
R-3S68
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
∆
∆
∆
∆
∆
*
T1 RTRNPA088DRE0 Transformer 1 AT
VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AH
ZD1 VHEHZ4A2///-1 Zener diode (HZ4A2) 1 AA
3- 2 FPNLCB223WRK0 Control panel frame with key sheet 1 AX
3- 2-1 PSHEPA559WRE0 Key sheet 1 AQ
3- 3 JBTN-A921WRF0 Open button 1 AF
3- 4 MSPRCA050WRE0 Open button spring 1 AB
3- 5 XEPSD30P08XS0 Screw; Control unit mtg. 8 AA
OVEN PARTS
4- 1 PHOK-A095WRF0 Latch hook 1 AN
4- 2 LBNDKA095WRP0 Capacitor holder 1 AM
4- 3 NFANJA029WRE0 Fan blade 1 AL
4- 4 PDUC-A599WRP0 Fan duct 1 AK
4- 5 FOVN-A333WRT0 Oven cavity 1 BD
4- 6 LANGFA171WRP0 Chassis support 1 AG
4- 7 MLEVPA194WRF0 Switch lever 1 AG
4- 8 NCPL-A045WRF0 Coupling 1 AH
4- 9 PCOVPA275WRE0 Waveguide cover 1 AR
4-10 PCUSGA339WRP0 Cushion 1 AG
4-11 PCUSUA329WRP0 Cushion 1 AC
4-12 PDUC-A597WRF0 Air guide 1 AG
4-13 PFILWA041WRE0 Lamp filter 1 AF
4-14 PPACGA084WRF0 TTM packing 1 AF
4-15 LANGQA368WRP0 Fuse angle 1 AL
4-16 LANGQA343WRP0 Thermal cut-out (Fan) mounting angle 1 AK
4-17 PCUSGA378WRP0 Cushion 1 AL
4-18 PCUSGA388WRP0 Cushion 1 AK
4-19 PCUSUA278WRP0 Cushion 1 AC
DOOR PARTS
5- 1 FDORFA283WRT0 Door panel 1 AY
5- 2 PSHEPA382WRE0 Sealer film 1 AH
5- 3 GCOVHA342WRF0 Choke cover 1 AM
5- 4 GWAKPA348WRR0 Door frame 1 AN
5- 5 HPNL-A586WRE0 Door screen 1 AQ
5- 6 LSTPPA139WRF0 Latch head 1 AF
5- 7 MSPRTA084WRE0 Latch spring 1 AB
5- 8 PCUSUA452WRP0 Cushion 2 AB
5- 9 XCPSD40P06000 Screw; 4mm x 6mm 2 AA
MISCELLANEOUS
6- 1 FROLPA057WRK0 Roller stay 1 AQ
6- 2 NTNT-A051WRE0 Turntable tray 1 AR
6- 3 TINS-A565WRR0 Operation manual (English) 1 AR
6- 3 TINS-A564WRR0 Operation manual (Thai) 1 AL
6- 4 FW-VZB045WRE0 Switch harness 1 AH
6- 5 FW-VZB494WRE0 Main wire harness 1 AW
6- 6 QW-QZA150WRE0 High voltage wire B 1 AF
6- 7 LHLDWA011WRE0 Purse lock “M” 1 AB
6- 8 TCAUHA214WRR0 Caution label 1 AC
6- 9 PSHE-A068WRR0 Menu label 1 AM
6-10 TSPCNC322WRR0 Name plate 1 AC
6-11 PZET-A012WRE0 Terminal insulator 1 AB
6-12 QTANP0020YBE0 Connector 1 AA
6-13 TCADCA565WRR0 Cook book (Thai) 1 AZ
6-14 QW-QZA177WRE0 Earth wire 1 AK
6-15 TLABPA032WRR0 Grounding label 1 AG
SCREWS,NUTS AND WASHERS
7- 1 XFPSD40P08K00 Screw : 4mm x 8mm 9 AA
7- 2 XFPSD30P06000 Screw : 3mm x 6mm 2 AA
7- 3 XHTSD40P08RV0 Screw : 4mm x 8mm 3 AA
7- 4 XHTSD40P08000 Screw; 4mm x 8mm 1 AA
7- 5 XOTSD40P12RV0 Screw : 4mm x 12mm 14 AA
7- 6 XOTSD40P12000 Screw : 4mm x 12mm 9 AA
7- 7 XVPSD40P20000 Screw; 4mm x 20mm 1 AA
7- 8 XFPSD30P10000 Screw; 3mm x 10mm 1 AA
Page 33
31
R-3S68
PACKING AND ACCESSORIES
HOW TO ORDER REPLACEMENT PARTS
To have your order filled prompty and correctly, please furnish the following information.
1. MODEL NUMBER 2. REF. NO.
3. PART NO. 4. DESCRIPTION
DOOR PROTECTION SHEET
SPADPA204WRE0
TOP PAD ASSEMBLY
FPADBA311WRK0
PLASTIC BAG
SSAKHA034WRE0
Not replaceable items.
PACKING CASE
SPAKCC764 WRE0
BOTTOM PAD ASSEMBLY
FPADBA312WRK0
TURNTABLE TRAY
OPERATION MANUAL
ROLLER STAY
SHRINK WRAP BAG
TRAY PAD
SPADFA257WRE0
INTO THE
OVEN CAVITY
COOK BOOK
WARRANTY CARD
VIDEO TAPE
Page 34
32
R-3S68
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
OVEN AND CABINET PARTS
2-1
7-5
7-5
7-5
7-5
7-6
7-6
1-13
1-12
4-13
4-12
4-11
1-4
7-1
1-3
7-6
6-10
7-6
7-3
6-14
1-9
1-17
4-2
7-2
1-5
1-1
7-6
4-6
7-3
1-4
4-10
1-1
1-2
7-5
7-5
4-1
7-1
4-3
7-1
4-4
6-2
6-1
1-7
1-16
6-11
4-7
2-4
7-5
7-57-6
2-2
2-4
7-5
2-3
4-9
7-1
1-14
4-14
4-8
4-5
7-4
1-11
7-8
1-10
4-18
4-19
6-15
7-1
1-9
4-17
x2
1-15
7-3
7-1
4-15
4-16
1-8
7-2
7-7
A
A
7-6
1-6
6-8
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R-3S68
CONTROL PANEL PARTS
3-2-1
3- 3
3- 4
3- 2
3- 1
3- 5
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
MISCELLANEOUS
DOOR PARTS
5-2
5-3
5-1
5-5
5-6
5-7
5-4
5-9
5-9
5-8
5-8
Actual wire harness may be different from illustration.
6-4
6-12
6-7
6-5
6-6
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R-3S68
'96SHARP CORP. (3U0.07E) Printed in Japan
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