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R-3A88
SERVICE MANUAL
S3614R3A88PX/
MICROWAVE OVEN
MODEL
R-3A88
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
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
SHARP CORPORATION
R-3A88
R-3A88
SERVICE MANUAL
PRODUCT SPECIFICATIONS
MICROWAVE OVEN
R-3A88
GENERAL IMPORTANT INFORMATION
APPEARANCE VIEW
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.
OPERATING SEQUENCE
FUNCTION OF IMPORTANT
COMPONENTS
SERVICING AND
TROUBLESHOOTING CHART
TEST PROCEDURE
TOUCH CONTROL PANEL
ASSEMBLY
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
MICROWAVE MEASUREMENT
WIRING DIAGRAM
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.
SHARP CORPORATION
OSAKA, JAPAN
1
PARTS LIST
R-3A88
PRODUCT SPECIFICATIONS
ITEM
Power Requirements
Power Consumption
Power Output
Case Dimensions
Cooking Cavity Dimensions
Turntable diameter
Control Complement
Set Weight
DESCRIPTION
220 Volts
50 Hertz
Single phase, 3 wire earthed
1.35 kW
850 watts nominal of RF microwave energy (IEC 705)
Operating fequency 2450 MHz
Width 520 mm
Height 305 mm
Depth 389mm
Width 348 mm
Height 197 mm
Depth 368 mm
325mm
Touch Control System
Clock ( 1:00 - 12:59)
Timer (0 - 99 minutes 99 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
HELP pad, REHEAT pad
RICE COOK pad
STEAM MENU pad
MORE, LESS pads
INTERNATIONAL MENU pads
SLOW COOK pad
EASY DEFROST pad
NUMBER pads,
POWER LEVEL pad
pad
AUTO START/
STOP/CLEAR pad
INSTANT COOK/START pad
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
BLUE
BROWN
2
: EARTH
: NEUTRAL
: LIVE
R-3A88
APPEARANCE VIEW
1.
2.
3.
4.
5.
6.
Ventilation openings
Oven lamp
Door hinges
Door safety latches
See through door
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
6
1
10
14
9
3
8
4
5
7
12
2 11 4
13
TOUCH CONTROL PANEL
a HELP PAD
Touch to select child lock, language or demonstration modes.
Touch to get cooking information.
COOK
b REHEAT PAD
Touch to reheat 3 popular menus.
KG
INTERACTIVE
DISPLAY
c RICE COOK PAD
Touch to cook rice, congee or porridge.
d STEAM MENU PAD
Touch to cook steam menus.
REHEAT
DEF
HELP
a
c
HELP
RICE COOK STEAM MENU
b
e. INTERNATIONAL MENUE OADS
Touch to cook 3 international menus.
f SLOW COOK PAD
Touch to cook slowly and longer time.
Indicator
d
1 Dishes
1 Rice
1 Fish
2 Beverage
2 Congee
2 Meat
3 Bread
3 Porridge
3 Dumpling
g EASY DEFROST PAD
Touch to defrost meat by entering weight.
INTERNATIONAL MENU
e
h MORE ( ), LESS ( ) PADS
Touch to adjust the doneness of food in one minute increments
during cooking or to increase/decrease the time whilst
programming the REHEAT, RICE COOK, STEAM MENU,
INTERNATIONAL MENU or EASY DEFROST modes.
f
i NUMBER PADS
Touch to enter cooking times, clock time, weight or quantity of
food.
Mini pizza Tom Yum Kung
SLOW COOK
Sukiyaki
EASY DEFROST
g
h
j AUTO START/CLOCK PAD
Touch to set clock or Auto Start time.
k POWER LEVEL PAD
Touch to select microwave power setting.
If not touched, HIGH is automatically selected.
l STOP/CLEAR PAD
Touch to clear during programming.
Touch once to stop operation of oven during cooking; touch
twice to cancel cooking programme.
m INSTANT COOK/START PAD
Touch once to cook for 1 minute at HIGH or increase by 1 minute
multiples each time this pad is touched during cooking.
Touch to start oven after setting programmes.
3
1
2
3
4
5
6
7
8
9 O
i
j
AUTO START/
POWER LEVEL
k
l
STOP / CLEAR
INSTANT COOK / START
m
R-3A88
OPERATION SEQUENCE
OFF CONDITION
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.
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.
6.
MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by oven
door, and monitors the operation of the 1st latch switch
and 2nd. interlock relay.
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.
Figure O-1 on page 25
1. The display shows SHARP , MICRO- ,
WAVE
and
OVEN .
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
Oven lamp, Fan motor, Turntable motor
Power transformer
RELAY
RY1
RY2
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
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
SWITCH
CONTACT
CONDITION
DURING
COOKING
1st. latch switch
2nd. interlock relay
control switch
COM-NO
Closed
Open
COM-NO
Closed
Open
Monitor switch
COM-NC
Open
Closed
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
HIGH
24 sec. ON
8 sec. OFF
Approx. 70%
MEDIUM HIGH
18 sec. ON
14 sec. OFF
12 sec. ON
20 sec. OFF
MEDIUM
Approx. 50%
Approx. 30%
MEDIUM LOW
6 sec. ON
LOW
26 sec. OFF
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.
DOOR OPEN
(NO COOKING)
4
R-3A88
FUNCTION OF IMPORTANT COMPONENTS
DOOR OPEN MECHANISM
FUSE M8A
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.
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.
LATCH HOOK
THERMAL CUT-OUT TC 145˚C (MG)
LATCH
HEADS
SWITCH
LEVER
2ND. INTERLOCK
RELAY CONTROL
SWITCH
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
voltage 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.
MONITOR
SWITCH
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.
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.
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.
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, 2ND. INTERLOCK RELAY, 2ND. INTERLOCK RELAY
CONTROL SWITCH, MONITOR SWITCH AND
MONITOR RESISTOR FOR PROPER OPERATION.
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
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.
5
R-3A88
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
REMEMBER TO CHECK 4R
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
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.
WARNING: AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
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.
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.
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.
6
R-3A88
CK = Check / RE = Replace
Home fuse blows when power
supply cord is plugged into wall
outlet.
FUSE M8A blows when power
supply cord is plugged into wall
outlet.
OFF
CONDITION
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.
ON
CONDITION
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.
Oven stops as soon as the START
pad is touched.
7
BLOCKED VENTILATION
BLOCKED COOLING FAN
MISADJUSTMENT SWITCH
HOME FUSE OR BREAKER
WALL OUTLET
OVEN LAMP OR SOCKET
SHORTED WIRE HARNESS
OPENED WIRE HARNESS
RECKCKRE CK CKCKCK CK
POWER SUPPLY CORD
RELAY (RY-1, RY-2)
FOIL PATTERN ON P.W.B.
KEY UNIT
TOUCH CONTROL PANEL
TURNTABLE MOTOR
FUSE M8A
FAN MOTOR
MONITOR RESISTOR
THERMAL CUT-OUT 95˚C
THERMAL CUT-OUT 145˚C
PROBLEM
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
CONDITION
MAGNETRON
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
1ST. LATCH SWITCH
2ND. INTERLOCK RELAY
CONTROL SWITCH
MONITOR SWITCH
A B C D E E E G F F H H I K L M N
HIGH VOLTAGE CAPACITOR
TEST PROCEDURE
R-3A88
TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
MAGNETRON TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL
WHILE THE OVEN IS IN OPERATION.
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.
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.
8
R-3A88
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 for51 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.
9
R-3A88
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
C
B
CARRY OUT 4R CHECKS.
HIGH VOLTAGE RECTIFIER
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 10MΩ 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.
COM; Common terminal,
Table: Terminal Connection of Switch
Plunger Operation
Released
Depressed
COM to NO
O.C.
S.C.
COM to NC
S.C.
O.C.
NO;
NC;
S.C.;
O.C.;
Normally open terminal
Normally close terminal
Short,
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
Parts Name
Temperature of "ON" condition
(closed circuit) (˚C)
Temperature of "OFF" condition
(open circuit) (˚C)
Thermal cut-out 145˚C
Thermal cut-out 95˚C
This is not resetable type
Below 75˚C
Above 145˚C
Above 95˚C
Indication ofohmmeter
(When room temperature
is approx. 20˚C)
Closed circuit.
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.
10
R-3A88
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
G
COMPONENT TEST
MONITOR RESISTOR TEST
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.
H
MOTOR WINDING 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.
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.
I
CARRY OUT 4R CHECKS
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 relay control 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 divided into two units, Control Unit and Key
Unit, and troubleshooting by replacement is described according to the symptoms indicated.
1. Key Unit Note : Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Panel
The following symptoms indicate a defective control unit. Before replacing the control unit,
perform the Key unit test (Procedure K) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
11
R-3A88
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 troubles caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
K
KEY UNIT TEST
If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is marking
good contact, 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, disconnecct the flat ribbon cable that connects the key unit to the control unit and make sure
the door sensing switch is closed (either close the door or short the door sensing switch connecter). Use
the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins
that correspond to the STOP/CLEAR pad marking momentary contact. If the control unit responds by
clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it
is 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 key pad is at fault.
G8
G7
G6
G5
G4
G3
G2
G9
5
4
3
2
1
Mini pizza
STEAM MENU
G10
0
9
8
7
6
G11
Sukiyaki
EASY DEFROST
INSTANT
COOK
G12
AUTO START
G1
SLOW COOK RICE COOK
POWER LEVEL
STOP / CLEAR Tom Yum Kung
REHEAT
HELP
START
KEY UNIT
L
RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check the 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 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.
12
R-3A88
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
APPROX. 25.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
APPROX. 25.0V D.C.
Power transformer
CARRY OUT 4R CHECKS.
N
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
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
1
OCCURANCE
CAUSE OR CORRECTION
The rated AC voltage is not present at
3
POWER terminal of CPU connector (CN-A).
The rated AC voltage is present at primary
side of low voltage transformer.
Only pattern at "a" is broken.
4
Pattern at "a" and "b" are broken.
2
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and repair.
*Insert jumper wire J1 and solder.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
*Insert the coil RCILF2003YAZZ between "c" and "d".
(CARRY OUT 3D CHECKS BEFORE REPAIR)
LOT NO.
NOTE: *At the time of making these repairs,
make a visual inspection of the varistor.
check for burned damage and examine
the transformer with a tester for the presence of layer short-circuit (check primary
coil resistance). If any abnormal condition is detected, replace the defective
parts.
c
(J2)
CARRY OUT 4R CHECKS.
13
5
1
CN-A
a
(J1)
b
36
d
VRS1
R-3A88
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor and
light the oven lamp.
The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit
8) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a cathode,
a grid and an anode. Usually, the cathode of a Fluorescent
Display is directly heated and the filament serves as
cathode.
The Fluorescent Display has 7-digits, 15-segments are
used for displaying figures.
The principal functions of these units and the signals communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through R10, R11, R12, R13,
R20, R21 and R22.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through R00, R01,
R02 and R03 to perform the function that was requested.
Control Unit
Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit and indicator
circuit.
1) LSI
This LSI controls the key strobe signal, relay driving signal
for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltages necessary in the control
unit.
Symbol
VC
VP
VF1
VF2
Voltage
-5V
-34V
2.2Vac
Application
LSI(IC1)
Fluorescent display tube : Grid
and anode voltage
Filament of fluorescent display
tube
(VF1 to VF2 voltage)
3) 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.
4) ACL Circuit
A circuit to generate a signals which resets the LSI to the
initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
14
R-3A88
DESCRIPTION OF LSI
LSI(IZA683DR)
The I/O signal of the LSI(IZA683DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
1
Vdisp
IN
Anode (segment) of Fluorescent Display light-up voltage: -34V
Vp voltage of power source circuit input.
2
R00
IN
Signal coming from touch key.
When either one of G12 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R00. When no key is touched, the signal is held
at "L" level.
3
R01
IN
Signal coming from touch key.
When either one of G11 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R01. When no key is touched, the signal is held
at "L" level.
4
R02
IN
Signal coming from touch key.
When either one of G10 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R02. When no key is touched, the signal is held
at "L" level.
5
R03
IN
Signal coming from touch key.
When either one of G9 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R03. When no key is touched, the signal is held
at "L" level.
6
TEST
IN
Connected to VC.
7
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to “L”
level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
8
OSC1
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect
to OSC1 terminal.
9
OSC2
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of OSC2.
10/11
GND/AVSS
IN/IN
Connected to VC.
12
AN0
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opend; "L" level signal.
13-14
AN1-AN2
IN
Terminal to change cooking constant.
15
R33
OUT
Oven lamp, turntable motor and cooling fan motor driving signal. (Square Waveform
: 50Hz)
To turn on and off shut-off relay. The square (50Hz) is delivered to the relay driving circuit and
cook relay control circuit.
16
P40
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% power) the signal turns to “H” level and “L” level in repetition according to the power level.
17-19
R41-R43
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 fluorescent display.
20/21
AVCC/VCC
IN/IN
Connected to GND.
22
INT
IN
23-24
D1-D2
OUT
Signal to synchronized with commercial source frequency(50Hz).
This is basic timing for time processing of LSI.
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 fluorescent display.
15
R-3A88
Pin No.
Signal
I/O
Description
25
BUZZ
OUT
Signal to sound buzzer.
A: key touch sound (0.12 sec.).
B: Completion sound (2.4 sec.).
26-27
D4-D5
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 fluorescent display.
28
D6
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G8 line keys on key matrix is touched.
29-30
D7-D8
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 grid of the fluorescent
display.
31-34
R80-R83
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 grid of the fluorescent
display.
35
R10
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 grid of the fluorescent
display.
36
R11
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G7 line keys on key matrix is touched.
37
R12
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G6 line keys on key matrix is touched.
38
R13
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G5 line keys on key matrix is touched.
39
R20
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G4 line keys on key matrix is touched.
40
R21
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G3 line keys on key matrix is touched.
41
R22
OUT
Segment data signal.
Signal similar to P41.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of
G2 line keys on key matrix is touched.
42
R23
OUT
Segment data signal.
Signal similar to P41.
16
R-3A88
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.
jumper, which brings about an operational state that is
equivalent to the oven door being closed. As for the sensorrelated controls of the touch control panel, checking them
is possible if dummy resistor(s) with resistance is 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 sensor-related controls
of the touch control panel by using the dummy resistor(s).
approx. 1M ohm
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
2. Shapes of Electronic Components
E
CB
Transistor
2SA933S
DTA143ES
KRA101M
KRC243M
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.
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 supply 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; and 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
17
R-3A88
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
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.).
1.
2.
3.
4.
5.
6.
Door does not close firmly.
Door hinge, support or latch hook is damaged.
The door gasket or seal or damaged.
The door is bent or warped.
There are defective parts in the door interlock system.
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.
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 7 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENT
OR WIRING.
MAGNETRON REMOVAL
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".
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
SCREWS
MAGNETRON
WAVEGUIDE
FLANGE
Figure C-1. Magnetron replacement
POWER TRANSFORMER REMOVAL
magnetron and capacitor terminals.
3. Remove four (4) screws holding transformer to bottom
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from power transformer,
18
R-3A88
plate right.
4. Remove transformer from bottom plate right.
5. Remove the one (1) terminal insulator from filament lead
(longer one) of power transformer.
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
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown illustlated
below.
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.
COVERS
Terminal
insulator
Flat type
screw driver
RECEPTACLE
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
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.
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.
POSITIVE LOCK® CONNECTOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock® connector.
3. Pull out the positive lock® connector.
Terminal
Positive lock®
connector
1
Push
Lever
CAUTION: WHEN YOU (SERVICE ENGINEERS) CONNECT THE POSITIVE LOCK® CONNECTORS
TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACE
YOU (SERVICE ENGINEERS).
2
Pull down
Figure C-2. Positive lock® connector
CONTROL PANEL ASSEMBLY REMOVAL
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.
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, remove
remaining adhesive on the control panel frame
19
R-3A88
TURNTABLE MOTOR 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.
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")
COOLING FAN MOTOR REMOVAL
9. Remove the two (2) screws holding the fan motor to the
fan duct.
10.Now, the fan motor is free.
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.
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 center 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.
Coil
Groove joint pliers
Shaft
Stator
These are the position
where should be
pinched with pliers
Axis
Gap
Bracket
Shaft
Rotor
Stator
Rotor
Rear View
Side View
20
Table
Center of
bracket
R-3A88
OVEN LAMP AND LAMP SOCKET REMOVAL
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.
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
Figure C-3. Oven lamp socket
POWER SUPPLY CORD REPLACEMENT
Removal
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.
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.
Blue wire lead of power supply cord
15 mm
Re-install
Wire lead of the
main wire harness
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.
Connector
CE-230
Conductor:
Stripped portion
Connector
CE-230
Figure C-4. Power supply cord replacement
1ST. LATCH SWITCH, 2ND. INTERLOCK RERAY CONTROL SWITCH AND MONITOR SWITCH REMOVAL
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.
1ST. LATCH SWITCH, 2ND. INTERLOCK RERAY CONTROL SWITCH AND MONITOR SWITCH
ADJUSTMENT
cavity front flange.
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
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
21
R-3A88
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.)
should be less than 0.5mm. The vertical position of the
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.
LATCH HOOK
2ND. INTERLOCK
RELAY CONTROL
SWITCH
LATCH
HEADS
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.
MONITOR
SWITCH
SWITCH
LEVER
1ST. LATCH
SWITCH
Figure C-5. Latch Switch Adjustments
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.
10
9
11
8
12
7
Choke Cover
1
Putty Knife
6
2
5
4
3
Door frame
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.
22
R-3A88
SEALER FILM
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.
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
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved 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.
Backing film
Adhesive tape
Figure C-8. Sealer film
PIN
UPPER
OVEN HINGE
DDOR PANEL
CHOKE
COVER
PIN
LOWER
OVEN
HINGE
Figure C-7. Door Replacement
23
R-3A88
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.
2.
3.
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.
4.
5.
6.
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
Place the oven tray into the oven cavity.
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.
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.
Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
The microwave radiation emission should be measured
at any point of 5cm or more from the external surface of
the oven.
SHARP
mW cm 2
mW cm 2
Microwave leakage measurement at 5 cm distance
24
BLU
2ND. INTERLOCK RELAY
CONTROL SWITCH
THERMAL CUT-OUT
95˚C (FAN)
25
1ST. LATCH
SWITCH
Figure O-2. Oven Schematic-Cooking Condition
MAGNETRON
POWER TRANSFORMER
MONITOR
RESISTOR
0.8/20W
N.O.
H.V. RECTIFIER
TTM
FM
TTM
FM
OL
CONTROL
UNIT
H.V. RECTIFIER
CAPACITOR
1.07µ
AC2100V
MONITOR SWITCH
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
B2
B1
A3
A5
A1
MAGNETRON
POWER TRANSFORMER
MONITOR
RESISTOR
0.8/20W
RY-1
RY-2
THERMAL
CUT-OUT
145˚C
(OVEN)
THERMAL
CUT-OUT
145˚(MG)
FUSE
M8A
2ND.
INTERLOCK
RELAY
N.O.
CAPACITOR
1.07µ
AC2100V
MONITOR SWITCH
TURNTABLE MOTOR
FAN MOTOR
OL
A1
COM.
RY-1
2ND. INTERLOCK RELAY
CONTROL SWITCH
OVEN LAMP
CONTROL
UNIT
RY-2
THERMAL CUT-OUT
95˚C (FAN)
2ND.
INTERLOCK
RELAY
THERMAL
CUT-OUT
145˚C
(OVEN)
EARTH
G-Y
BRN
COM.
B2
A5
THERMAL
CUT-OUT
145˚(MG)
FUSE
M8A
BLU
220 V ˜ 50Hz
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
B1
A3
EARTH
G-Y
BRN
220 V ˜ 50Hz
R-3A88
NOTE: " " indicates components with potentials above 250V.
1ST. LATCH
SWITCH
Figure O-1. Oven Schematic-OFF Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. START KEY TOUCHED
1
2
3
26
RY2
CN-A
5
1
CN-B
2
1
RY1
5
4
3 GRY
2
1 ORG
CN-A
2 GRN
1 GRY
CN-B
G
RED
CN-G
LSI
N.C.
COM.
GRY
4
NO
5
GRY
GRY
MONITOR
RESISTOR
TURNTABLE
MOTOR
BLK
ORG
GRY
RED
RED
WHT
RED
WHT
BRN
FUSE
M8A
LIVE
BRN
BLU
NEUTRAL
HIGH VOLTAGE
TRANSFORMER
G
/
Y
EARTH
POWER
SUPPLY
CORD
HIGH
VOLTAGE
CAPACITOR
HIGH VOLTAGE
WIRE B
MAGNETRON
HIGH VOLTAGE COMPONENTS
RED
WHT
5
D
Figure S-1. Pictorial Diagram
RED
BLK
RED
E
WHT
GRY
WHT
WHT
WHT
THERMAL CUT-OUT
(MAGNETRON)
WHT
THERMAL CUT-OUT
(FAN)
GRY
WHT
NOTE:
Live (RED) wire must be
connected to the terminal
with blue mark on the
oven light socket.
BLUE MARK
4
COM.
1ST
LATCH
SWITCH
GRY
WHT
GRY
GRN
BLK
3
MONITOR
SWITCH
GRN
GRN
COM.
N.O.
F
BLK
BLK
A
RED
FAN MOTOR
2
BLK
H
CONTROL UNIT
2ND INTERLOCK
RELAY CONTROL
SWITCH
B
OVEN LAMP
AND SOCKET
1
H.V.
RECTIFIER
C
THERMAL CUT-OUT
(OVEN)
R-3A88
6
A
B
C
6
D
E
F
G
H
3
27
4
B1
B2
NO
VRS1
b
Note :
c
d
RY2
RY1
2
4
Q22
DTA143ES
(J5)
(J3)
-
+
R11 56K
C30
(J6)
(J4)
R31 4.7K
-
+
5
IF NOT SPECIFIED, 0.01µF/16V
IF NOT SPECIFIED, 1SS270A
VC
(D)
-
+
C4
VC
Q1
2SA933
R4
1K
ZD2
HZ4C3
(B)
R54 15K
R53 15K
R52 15K
R51 15K
R50
150K x 4
(C)
(A)
Q72
Q70~Q72
Q70 Q71
2SA933
R73 100K
C50
330p x 4
Vdsp 1
R00
R01
R02
R03 5
TEST
RST
OSC1
OSC2
GND 10
AVSS
AN0
AN1
AN2
R33 15
R40
R41
R42
R43
AVCC 20
VCC 21
(C)
(B)
(A)
CONTROL UNIT
R74 100K
(D)
R75 100K
22
25
30
35
G12
G11
G10
G9
R40 1K
R20
R13
R12
R11
R10
R83
R82
R81
R80
D8
D7
D6
D5
D4
BUZZ
D2
D1
INT
40 R21
R22
42 R23
KG
DEF HELP
4
9
5
0
EASY DEFROST
G7
G8
INSTANT
COOK
START
8
3
G6
AUTO START
Sukiyaki
7
2
G5
STEAM MENU
STOP/CLEAR Tom Yum Kung
HELP
POWER LEVEL REHEAT
SLOW COOK RICE COOK
Mini pizza
1
6
G3
G4
G2
G1
F F P P P P P P P P 7 6 5 4 3 2 1 P PP P P P P F F
28 2 2 15 14 13 12 1110 9 8 G G G G G G G 7 6 5 4 3 2 1 1 1 1
COOK
5
C3 47µ/16V
Figure S-2. Contrl Panel Circuit
R3
820
1/2W
R2
820
1/2W
Q20
KRA101M
-
+
C2 330µ/35V
C7
0.1µ/50V
4
IF NOT SPECIFIED, 1/4W ± 5%
D30
Q21
KRC243M
J35
510
D1 S1NB10
- C6
+ 47µ/16V
3
DOOR
SWITCH
A1
A5
COM
POWER
TRANSFORMER
FAN MOTOR
TURNTABLE
MOTOR
OVEN LAMP
AC220V
50Hz
(J1)
(J2)
3
D20
J27 150
D21
R5
4.7K
R70 4.7K
R6 12 1/2W
D50
6
5
C5
FLUORESCENT DISPLAY TUBE
D51
1
C21
10µ/35V
A3
R10 47K
D22
R41 3.3K
R7 150
SP40
C1 0.1µ/50V
C10
0.01µ/25V
R30 15K
2
C20 0.1µ/50V
H
CF1 4MHz
D2
D52
1
D53
G
D54
F
D55
E
R60
1M
C
D56
D
2
R71 4.7K
1
R72 4.7K
A
IC1 IZA683DR
B
T1
R-3A88
6
A
B
C
6
D
E
F
G
H
KEY UNIT
a
R-3A88
1
2
4
3
5
6
QKITPB014MRE0
A
A
FLR. DISPLAY
TAPE
B
DIP
B
5
1
15
20
25
R6
R73
R74
R75 E
(R80)
21
B
Q72
Q71
E
Q70
B
25
IC1
R60
D
26
C7
(J3)
(J5)
28
C30
C5
E
(R7)
R2
35
C20
B
Q21
D30
D22
C4
C3
31
Q1
E
CN - G
32
E
R41
R40
R4
Q22
30
29
B
B
SP40
R30 R31
R3
27
1
R5
ZD2
21
(J4)
(J6)
CE1
R51
R52
R53
R54
B
R70
R72
R71
1
D
C
1
2
(R81)
42
D57
(D56)
(D55)
D54
D53
D52
D51
D50
28
3
4
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
C
10
(J7)
34
E
B
33
E
C21
POWER
D20
D2
F
C1
R10
(D3)
(D5)
(D4)
C2
CN - B
LOT NO.
R11
1
E
2
C10
C6
Q20
R50
C50
12
DOOR
SW
FM TTM OL
F
5
1
D1
CN - A
(D6)
36
(J1)
RY1
VRS1
BFB
F
(J2)
2
1
G
G
T1
RY2
P
S2
SMCA
SATL
6
S1
5
4
3
D21
H
H
Figure S-3. Printed Wiring Board
1
2
4
3
28
5
6
R-3A88
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
1- 1
1- 2
1- 3
1- 4
1- 5
1- 6
1- 7
1- 8
1- 9
1-10
1-11
1-12
1-13
1-14
1-15
1-16
1-17
QSW-MA110WRE0
QSW-MA111WRE0
RV-MZA197WRE0
RTHM-A080WRE0
FH-DZA047WRK0
RC-QZA172WRE0
RMOTEA265WRE0
RTHM-A072WRE0
QACC-A065WRE0
QFS-CA010WRE0
QFSHDA019WRE0
QSOCLA022WRE0
RLMPTA069WRE0
RMOTDA169WRE0
RR-WZA003WRE0
RTRN-A480WRE0
QPLGAA018WRE0
1st. latch and 2nd. Iinterlock relay control switches
Monitor switch
Magnetron
Thermal cut-out 145˚C
High voltage rectifier assambly
High voltage capacitor
Cooling fan motor
Thermal cut-out 95˚C
Power supply cord
Fuse (M8A)
Fuse holder
Oven lamp socket
Oven lamp
Turntable motor
Monitor resistor
0.8Ω
20W
Power transformer
AC plug
2222-
GCABUA522WRT0
FDAI-A171WRY0
GDAI-A261WRW0
GLEGPA019WRE0
Outer case cabinet
Bottom plate right
Bottom plate left
Foot
Q'TY
CODE
2
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
AK
AK
BN
AP
AQ
AY
AZ
AM
AS
AE
AH
AG
AK
AW
AG
BP
AL
1
1
1
4
AT
AT
AP
AD
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
3
1
7
1
1
1
1
1
3
2
1
1
1
1
1
1
1
1
1
1
1
4
1
3
3
1
BM
AC
AB
AF
AX
AC
AC
AA
AH
AA
AC
AA
AB
AB
AH
AE
AD
AG
AA
AA
AA
AA
AU
AB
AB
AB
AB
AB
AD
AA
AA
AB
AA
AA
AA
AA
AA
AA
AA
AC
AA
AA
AA
AA
AA
ELECTRICAL PARTS
∆ *
*
*
*
CABINET PARTS
1
2
3
4
CONTROL PANEL PARTS
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
C1
C2
C3
C4-5
C6
C7
C10
C20
C21
C30
C50
CF1
D1
D2
D20-22
D30
D50-56
IC1
Q1
Q20
Q21
Q22
Q70-72
R2-3
R4
R5
R6
R7
R10
R11
R30
R31
R40
R41
R50
R51-54
R60
R70-72
R73-75
(J27)
CPWBFA684WRK0
QCNCMA234DRE0
QCNCMA275DRE0
QCNCWA057DRE0
RV-KXA069DRE0
RC-KZA132DRE0
VCEAB31VW337M
VCEAB31CW476M
VCKYD11CY103N
VCEAB31CW476M
RC-KZA132DRE0
VCKYB11EX103N
VCEAB31HW104M
VCEAB31VW106M
VCKYD11CY103N
RMPTEA009DRE0
RCRS-A012DRE0
RSRCDA013DRE0
VHD1SS270A/-1
VHD1SS270A/-1
VHD1SS270A/-1
VHD1SS270A/-1
RH-IZA683DRE0
VS2SA933S//-3
VSKRA101M//-3
VSKRC243M//-3
VSDTA143ES/1B
VS2SA933S//-3
VRD-B12HF821J
VRD-B12EF102J
VRD-B12EF472J
VRD-B12HF120J
VRD-B12EF151J
VRD-B12EF473J
VRD-B12EF563J
VRD-B12EF153J
VRD-B12EF472J
VRD-B12EF102J
VRD-B12EF332J
RR-DZA143DRE0
VRD-B12EF153J
VRD-B12EF105J
VRD-B12EF472J
VRD-B12EF104J
VRD-B12EF151J
Control unit
3-pin connector (CN-A)
2-pin connector (CN-B)
12-pin connector (CN-G)
Fluorescent display tube
Capacitor
0.1uF 50V
Capacitor
330uF 35V
Capacitor
47uF 16V
Capacitor 0.01uF 16V
Capacitor
47uF 16V
Capacitor
0.1uF 50V
Capacitor 0.01uF 25V
Capacitor
0.1uF 50V
Capacitor
10uF 35V
Capacitor 0.01uF 16V
Capacitor array 330pF x 4
Ceramic resonator (CST4.00MGW)
Diode bridge (S1NB10)
Diode (1SS270ATA)
Diode (1SS270ATA)
Diode (1SS270ATA)
Diode (1SS270ATA)
LSI
Transistor (2SA933S)
Transistor (KRA101M)
Transistor (KRC243M)
Transistor (DTA143ES)
Transistor (2SA933S)
Resistor
820 ohm 1/2W
Resistor 1.0k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor
12 ohm 1/2W
Resistor
150 ohm 1/4W
Resistor
47k ohm 1/4W
Resistor
56k ohm 1/4W
Resistor
15k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 1.0k ohm 1/4W
Resistor 3.3k ohm 1/4W
Resistor array 150k ohm x 4
Resistor
15k ohm 1/4W
Resistor
1M ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 100k ohm 1/4W
Resistor
150 ohm 1/4W
29
R-3A88
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO.
(J35)
RY1
RY2
SP40
T1
VRS1
ZD2
3- 2
3- 2-1
3- 3
3- 4
3- 5
PART NO.
VRD-B12EF511J
RRLY-A080DRE0
RRLY-A076DRE0
RALM-A014DRE0
RTRNPA098DRE0
RH-VZA032DRE0
VHEHZ4C3///-1
FPNLCB225WRK0
FUNTKA753WRE0
JBTN-A927WRF0
MSPRCA050WRE0
XEPSD30P08XS0
DESCRIPTION
Resistor
510 ohm 1/4W
Relay (OJ-SS-124LM)
Relay (OMIF-S-124LM)
Buzzer (PKM22EPT-THAI)
Transformer
Varistor (10G471K)
Zener diode (HZ4C-3)
Control panel frame with key unit
Key unit
Open button
Open button spring
Screw : 3mm x 8mm
Q'TY
1
1
1
1
1
1
1
1
1
1
1
2
CODE
AA
AG
AK
AG
AT
AE
AA
AZ
AV
AF
AB
AA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AN
AM
AL
AK
BD
AG
AG
AH
AR
AG
AC
AG
AF
AF
AL
AK
AL
AK
AC
1
1
1
1
1
1
1
2
AY
AH
AM
AN
AT
AF
AB
AA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AQ
AR
AQ
AH
AW
AF
AB
AC
AM
AE
AB
AA
AZ
AK
AG
AQ
9
2
3
1
14
9
1
1
AA
AA
AA
AA
AA
AA
AA
AA
OVEN PARTS
∆
PHOK-A095WRF0
LBNDKA095WRP0
NFANJA029WRE0
PDUC-A599WRP0
FOVN-A333WRT0
LANGFA171WRP0
MLEVPA194WRF0
NCPL-A045WRF0
PCOVPA275WRE0
PCUSGA339WRP0
PCUSUA329WRP0
PDUC-A597WRF0
PFILWA041WRE0
PPACGA084WRF0
LANGQA368WRP0
LANGQA343WRP0
PCUSGA378WRP0
PCUSGA388WRP0
PCUSUA278WRP0
Latch hook
Capacitor holder
Fan blade
Fan duct
Oven cavity
Chassis support
Switch lever
Coupling
Waveguide cover
Cushion
Cushion
Air guide
Lamp filter
TTM packing
Fuse angle
Thermal cut-out (Fan) mounting angle
Cushion
Cushion
Cushion
1
2
3
4
5
6
7
8
FDORFA283WRT0
PSHEPA382WRE0
GCOVHA342WRF0
GWAKPA354WRF0
HPNL-A657WRR0
LSTPPA139WRF0
MSPRTA084WRE0
XCPSD40P06000
Door panel
Sealer film
Choke cover
Door frame
Door screen
Latch head
Latch spring
Screw; 4mm x
6- 1
6- 2
6- 3
6- 4
6- 5
* 6- 6
6- 7
6- 8
6- 9
6-10
6-11
6-12
6-13
6-14
6-15
6-16
FROLPA057WRK0
NTNT-A051WRE0
TINS-A568WRR0
FW-VZB045WRE0
FW-VZB494WRE0
QW-QZA150WRE0
LHLDWA011WRE0
TCAUHA214WRR0
PSHE-A069WRR0
TSPCNC326WRR0
PZET-A012WRE0
QTANP0020YBE0
TCADCA565WRR0
QW-QZA177WRE0
TLABPA032WRR0
TINS-A567WRR0
Roller stay
Turntable tray
Operation manual (English)
Switch harness
Main wire harness
High voltage wire B
Purse lock “M”
Caution label
Menu label
Name plate
Terminal insulator
Connector
Cook book (Thai)
Earth wire
Grounding label
Operation manual (Thai)
∆
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
DOOR PARTS
∆ 555∆ 55∆ 555-
6mm
MISCELLANEOUS
SCREWS,NUTS AND WASHERS
77777777-
1
2
3
4
5
6
7
8
XFPSD40P08K00
XFPSD30P06000
XHTSD40P08RV0
XHTSD40P08000
XOTSD40P12RV0
XOTSD40P12000
XVPSD40P20000
XFPSD30P10000
Screw : 4mm x 8mm
Screw : 3mm x 6mm
Screw : 4mm x 8mm
Screw; 4mm x 8mm
Screw : 4mm x 12mm
Screw : 4mm x 12mm
Screw; 4mm x 20mm
Screw; 3mm x 10mm
30
R-3A88
HOW TO ORDER REPLACEMENT PARTS
To have your order filled prompty and correctly, please furnish the following information.
1. MODEL NUMBER
3. PART NO.
2. REF. NO.
4. DESCRIPTION
PACKING AND ACCESSORIES
TOP PAD ASSEMBLY
FPADBA311WRK0
DOOR PROTECTION SHEET
SPADPA204WRE0
PLASTIC BAG
SSAKHA034WRE0
MENU LABEL
WARRANTY CARD
OPERATION MANUAL (THAI)
OPERATION MANUAL (ENGLISH)
TRAY HOLDER
SPADFA340WRE0
BOTTOM PAD ASSEMBLY
FPADBA312WRK0
TURNTABLE TRAY
COOK BOOK
VIDEO TAPE
ROLLER STAY
GLASS COOK WARE
INTO THE
OVEN CAVITY
TRAY PAD
PACKING CASE
SPAKCC767 WRE0
Not replaceable items.
31
R-3A88
2
1
4
3
6
5
7-5
OVEN AND CABINET PARTS
7-5
6-2
2-1
A
A
7-5
1-13
1-12
6-1
4-13
7-5
B
B
1-4
4-12
7-1
6-8
4-11
C
C
7-6
1-3
6-10
7-6
6-15
7-6
D
4-19
4-5
D
7-6
6-14
7-3
A
1-17
1-9
E
E
4-8
4-10
7-5
1-5
1-1
7-1
4-9
7-2
1-4
7-5
4-14
1-6
7-1
4-18
1-2
F
4-1
2-3
1-14
7-1
4-6
4-2
4-3
4-15
6-11
7-4
7-1
x2
F
7-6
1-1
4-7
7-3
4-4
1-10
7-6
1-16
G
4-17
7-3
1-15
2-4
7-8
7-7
1-9
7-5
G
1-11
A
7-1
1-7
4-16
1-8
7-2
2-2
7-5
H
H
2-4
7-6
1
2
7-5
4
3
32
5
6
R-3A88
2
1
4
3
6
5
3- 2
A
CONTROL PANEL PARTS
A
3- 1
3- 5
B
B
3-2-1
DOOR PARTS
C
C
5-3
3- 3
5-2
3- 4
D
D
5-1
5-4
E
E
5-6
F
F
5-7
5-5
MISCELLANEOUS
6-5
G
G
6-4
Actual wire harness may be different from illustration.
H
6-7
6-6
1
2
4
3
33
5
H
6-12
6
R-3A88
'96SHARP CORP. (3U0.07E) Printed in Japan
34
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