[6] DOOR ADJUSTMENT ................................ 7-3
[7] DOOR SENSING SWITCH, SECOND-
ARY INTERLOCK SWITCH AND MONI-
TOR SWITCH REPLACEMENT ................. 7-3
[8] DOOR SENSING SWITCH, SECOND-
ARY INTERLOCK SWITCH AND MONI-
TOR SWITCH ADJUSTMENT .................... 7-4
Parts Guide
Page 3
1 – 1
Service Manual
CHAPTER 1. BEFORE SERVICING
[1] 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.
[2] 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.
[3] 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.
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN----------------------------------EARTH
WHITE -----------------------------------NEUTRAL
BLACK----------------------------------- LIVE
Page 4
2 – 1
Service Manual
CHAPTER 2. WARNING TO SERVICE PERSONNEL
The ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal,
electrical shock.
(Example)
Inverter unit, Magnetron, High Voltage Harness etc..
Read the Service Manual carefully and follow all instructions.
[1] Before Servicing
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
WARNING: RISK OF ELECTRIC SHOCK. DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds.
Whenever troubleshooting is performed the power supply must be disconnected. It may, in some cases, be necessary to connect the power supply
after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. Remove the bottom plate assembly, referring to “BOTOM PLATE ASSEMBLY” in page 8-4.
9. Disconnect the leads to the primary of the inverter unit.
10.Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
11.After that procedure, reconnect the power supply cord.
[2] When the testing is completed,
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
Don't Touch !
Danger High Voltage
Page 5
2 – 2
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. Reconnect all leads removed from components during testing.
9. Reinstall the outer case and the back plate assembly.
10.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
11.Run the oven and check all function.
[3] After repairing
1. Reconnect all leads removed from components during testing.
2. Reinstall the outer case (cabinet) and the back plate assembly.
3. Reconnect the power supply cord after the outer case and the back plate assembly are installed.
4. Run the oven and check all functions.
Super-Steam 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 ceramic
oven floor, close the door and set the power to 100% and set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at
zero) carefully check that the water is now hot. If the water remains cold carry out Before Servicing procedure 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
should be carried out.
[4] Before replacing the Printed Wiring Board
Some normal boards are found in board units that have been returned due to oven failure. So, most of board replacements may arise from poor harness connection. Accordingly, before replacing any board that was judged to require its replacement, use the following procedure to re-check that the
connection terminal of a connector has been properly inserted:
1. When the connectors have been incorrectly inserted to the control unit.
2. When latch switch adjustment is incorrect
When latch switch adjustment is incorrect, symptoms such as no heating, no heating start, no activation even with start button pressed, etc. will occur.
PWBCONNECTORSymptom
CONTROL UNITCN-AThe oven cannot be powered on.
CN-BNo heating can be done (even if the door or thermistor has not been opened). No cooling fan runs.
CN-DNo indication, no key insertion and no buzzer sound.
CN-EThe oven cannot be powered on, no fan motor runs and no oven lamp illuminate.
CN-GNo heating can be done. (Humidity sensor error)
Page 6
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Service Manual
CHAPTER 3. PRECAUTIONS FOR USING LEAD-FREE SOLDER
Employing lead-free solder
The “Main PWB” of this model employs lead-free solder. This is indicated by the “LF” symbol printed on the PWB and in the service manual. The suffixletter indicates the alloy type of the solder.
Example:
Using lead-free wire solder
When repairing a PWB with the “LF” symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may result in cold soldered
joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40?C higher than tin/lead alloy solder, it is recommend that a dedicated bit is used, and that
the iron temperature is adjusted accordingly.
Soldering
AAs the melting point of lead-free solder (Sn-Ag-Cu, Sn-Cu-Ni) is higher and has poorer wettability, (flow), to prevent damage to the land of the PWB,
extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time. Remove the bit as soon as a good flow is
achieved. The high content of tin in lead free solder will cause premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or
turn off the iron when it is not required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their characteristics, making good soldering
more difficult. It will be necessary to clean and replace bits more often when using lead-free solder. To reduce bit wear, care should be taken to clean
the bit thoroughly after each use.
Indicates lead-free solder of tin, silver and copperIndicates lead-free solder of tin, copper and nickel
Page 7
4 – 1
Service Manual
CHAPTER 4. PRODUCT DESCRIPTION
[1] SPECIFICATIONS
* The International Electrotechnical Commission’s standardized method for measuring output wattage. This test method is widely recognized.
If you cook the food over 8 minutes at 800W, the microwave power will be automatically reduced to 500W to avoid overcooking.
*1 After the end of cooking, when the door is kept closed and the temperature is high,the motor will continue to rotate until the temperature falls to the
constant temperature.
If the door is opened, the motor will rotate for 10 min.
*2 The heater will be turned on and off by the temperature control.
*3 After the end of cooking, the motor will rotate at about 2000 rpm for maximum 10 min.
*4 After the magnetron is operated at 800W power level for 8 min., the power level is fallen to 500W.
*5 After the end of preheating, if the door is opened, the motor will rotate for 10 min.
*6 The heater will be turned off 1 min. before the end of cooking.
*7 After the temperature rises to preset one, the heater will be turned on for 1 min.
*8 The heater will be turned on for 1 min. before the end of cooking.
[3] OFF CONDITION
1. When the oven is plugged in with the door closed, the line voltage is supplied to the noise filter. And the display shows nothing.
2. When the door is opened with plugged in, the contacts (COM-NC) of the secondary interlock switch is closed. And the line voltage is supplied to
the T/C transformer and the control unit. Then the contacts of the relay RY-8 are closed and the oven lamp is turned on. And the contacts of the
relay RY-11 are closed. The display shows “0”.
3. When the door is closed, the contacts (COM-NC) of the secondary interlock switch are opened. Because the contacts of the relay RY-11 have
been closed, the line voltage is kept supplying to the T/C transformer and the control unit. But the contacts of the relay RY-8 are opened and the
oven lamp is turned off.
NOTE: Automatic power off function
1) If the following 3 conditions are met, the contacts of the relay RY-11 will be opened and the control unit will be not energized. The oven is
turned off after 1~30min according to the temperature of the oven cavity.
a) The door is closed.
b) The display shows "0".
c) The display does not show " ".
2) Open and close the door, the control unit will resume.
Page 18
6 – 1
Service Manual
CHAPTER 6. TEST PROCEDURE
[1] MAGNETRON (MG) TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.
CARRY OUT 3D
CHECKS.
Isolate the magnetron from the high voltage circuit by removing all leads connected to the 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 a short circuit 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 (1 litre water load)
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 IEC test procedure, 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 (sec-
ond), 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.
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 of the test.
3) Temperature of the water
The initial temperature of the water is (10±1)°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 an 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 heat-up time is not included.
NOTE: The operation time of the microwave oven is “t + 3" sec. 3 sec. is magnetron filament heat-up time.
Measuring method:
1) 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 100% for the temperature of the water rises by a value T of 10°C.
5) Stir the water to equalize temperature throughout the vessel.
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.
JUDGEMENT: The measured output power should be at least ± 15% of the rated output power.
CAUTION: 1°C CORRESPONDS TO 80 WATTS. REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.
The formula is as follows;
P x t / 4.187 = V x T+ 0.55 x mc (T2-T0)/4.187 P (W) = 4.187 x V x T / t + 0.55 x mc (T2-T0)/t
Our condition for water load is as follows:
Room temperature (T0) ......................... around 20°C Power supply ........................... VoltageRated voltage
Water load .........................................................1000 g Initial temperature (T1) .................................... 10±1°C
Heating time ..................................................... 52 sec. Mass of container (mc) ...................................... 330 g
T2 .................................................... Final Temperature T = T2 - T1 P = 80 x T + 0.55 x mc (T2-T0)/52
Room temperature ................................................................... To = 21°C
Initial temperature ..................................................................... T1 = 11°C
Temperature after (52 + 3) = 55 sec. ..................................... T2 = 21°C
Temperature difference Cold-Warm ( T = T2 - T1) .......... T = 10°C
Measured output power
The equation is "P = 80 x T" .................... P = 80 x 10°C = 800 Watts
Page 19
6 – 2
[2] SECONDARY INTERLOCK SWITCH AND PRIMARY INTERLOCK SYSTEM TEST
1. SECONDARY INTERLOCK SWITCH
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an
open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the secondary interlock switch.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
2. PRIMARY INTERLOCK SYSTEM
2.1. DOOR SENSING SWITCH
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an
open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the door sensing switch.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
2.2. PRIMARY INTERLOCK RELAY (RY1)
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
1000g
1000g
1000g
T1 C
T2 C
Heat up for 55 sec.
Page 20
6 – 3
8. Disconnect the wire leads from the fan thermal cut out.
9. Connect the ohmmeter to the red/red terminal of the convection heater and one of the terminal of the convection thermal cut-out. By doing so, the
state of the relay contacts using a ohmmeter can be checked. The meter should indicate an open circuit. Because the relay contacts should be
open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.
10.Reconnect all leads removed from components during testing.
11.Reinstall the outer case and the back plate assembly.
12.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
13.Run the oven and check all function.
[3] MONITOR SWITCH TEST
1. Disconnect the power supply cord, and then remove the outer case and the
back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter
unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated
pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated
completely to avoid an electric shock.
8. Before performing this test, make sure that the secondary interlock switch
and the primary interlock relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor
switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a
closed circuit. When the monitor switch actuator is pushed by a screw driver through the right latch hole on the front plate of the oven cavity with
the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation
is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check
the continuity of the monitor circuit.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
[4] FUSE F20A TEST
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. If the fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the
“TEST PROCEDURE” for those switches before replacing the blown fuse.
CAUTION: BEFORE REPLACING A BLOWN FUSE, TEST THE PRIMARY INTERLOCK RELAY, SECONDARY INTERLOCK SWITCH, DOOR
SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
Monitor switch
N.C.
COM.
Page 21
6 – 4
[5] CHECKING TEMPERATURE IN THE CONVECTION (Oven) MODE
The following test procedure should be carried out with the oven is a fully assembled condition (outer case fitted).
It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type temperature tester must be used. A low priced
bi-metal type thermometer is not reliable or accurate. Position the thermocouple in the center of the oven cavity. The temperature should be checked
with outer case cabinet installed and set the oven temperature to 250°C in the convection mode (Oven). Approx. 15 minutes after the oven is started,
the temperature experienced may be approx. 15°C more or less than set temperature, however, in most cases the food cooking results will be satisfactory. Difference in power supply voltage will also affect the oven temperature. The Household power supply voltage may sometimes become lower
than the rated voltage and cause under-cooking. If the power supply voltage is 10% lower than the rated voltage, longer cooking time is required by
10% to 20%.
[6] ERROR LIST
EE code
EE code is memorized in the EEPROM address 04h as error history.
Only antenna error code is memorized in the EEPROM address 05h.
To check the EE code, carry out the test mode No.2 as follows.
Error
display
EE
code
Detail of errorError conditionApplication
menu
Check
method
Check timing
from heating
start
Note
U0404
Oven temperature
is high.
Oven temperature is too
high
fermentation
defrost
Thermistor
(Oven)
After 1sec.
" " is blinking in the display.
When oven temperature is turned
under 90C, error is released.
U110B
Water exist in the
water tank
Water exist in the water
tank at drain mode
drain mode
Water level
sensor
After 1sec
U150FWater tank is frozen
Engine heater temperature is too low.
Steam mode
water oven
water grill
Thermister
(Oven)
immediately
" "
blinking
0AShortage of Water
Water in the water tank
isn't enough.
Steam mode
water oven
water grill
Water level
sensor
Auto mode:
after 30 sec
manual mode:
within 7 sec
Error
dis-
play
EE
code
Detail of errorError conditionApplication menuCheck timingNote
C00Matching errorThe control unit and/or display unit is not for this model.Plug in
C01
<=>
888
11
Thermister (Oven)
error
Thermister (Oven) is short or
open.
Oven mode
Grill mode
Immediately
C02
<=>
888
12
Humidity sensor
error
Humidity sensor is short or
open.
Microwave mode
(Humidity sensor menu)
After 16 sec
C05
<=>
888
15
Engine heater
error
Engine heater temperature is
too high.
Steam mode
Water oven
Water grill
Always
C07
<=>
888
17
Relay monitor
error
error condition
microwave mode: when convection heater or engine heater
operate.
all relay is off: when convection heater or engine heater
operate both convection heater and engine heater operate.
Microwave mode:
immediately
Oven, Grill mode:
when heater is off
01(Ad
dress
05)
Antenna errorAntenna motor or antenna switch does not work.Microwave mode
When antenna error
is detected,
outout of miccrowave
is stopped.
C12
<=>
888
1C
Thermister
(Engine) error
Thermister (Engine) is open.
Steam mode
Water oven
Water grill
When engine heater
operates
more than 30sec.
C14
EEPROM error
(EEPROM data
verification error)
EERROM Read data is not
same as EEPROM write data.
PWB short check program
Short check program
Plug in
(reset)
Something is burning in the oven.
Humidity ladder level is too
low.
After 7 min
Power on and door closed[][][][Door open]Version No. is displayed.
Select test number 2 by encoder)[](Select address 04h or o5h by [])
Page 22
6 – 5
[7] How to check in the event of an error
NOTE: HOW TO SET THE TEST MODE
1. How to check water supply performance
1) Check of water level sensor performance
Within 2 sec.
(Power on and door closed )
[][][][OPEN DOOR]Version No. is displayed.(Test number is selected by encoder)[]
[
or push direct select key
]
End
Check
2) Check of tube pump performance
1) Check of water level sensor performance
End
NO
NO
NO
NO
NO
NO
NO
YES
YES
NO
YES
YES
YES
YES
YES
YES
NO
YES
Power ON after disconnecting the
water tank from the unit.
Fill the tank with water to the water
level 2 and set it to the main body.
Has the WL unit been filled with water?
Are there disconnection and short circuit in the water level sensor
connectors, connecting between the board and the sensor section?
Are there disconnection and short circuit in the water level sensor
connectors, connecting between the board and the sensor section?
Measure resistance of a set of the three (3) water level sensors with the
sensor connecting connector pulled out of the board.
Measure resistance of a set of the three (3) water level
sensors with the sensor connecting connector pulled out of
the board. (with the water tank filled with water)
Is the measured resistance value of
the set infinite?
Is the measured resistance value
of the set infinite?
Replace the control board or
the display board.
Replace the control board or the display board.
Check/replace the connection between the tank and the WL unit.
Do the H-side and L-side water level sensors
indicate 01 or more in the test mode?
Is ion-changed or pure water being used?
Use common water suitable for drinking.
(Filtered)
After confirming that the water level sensor wiring
of the water tank is OK, replace the WL unit.
After confirming that the water level sensor wiring of the water tank is OK,
replace the WL unit.
Is the unit in the following conditions?
Test mode: 00 (See Note)
H-side water level sensor: 00h~05h
L-side water level sensor: 00h~05h
Is the unit in the following conditions?
Test mode: 00
(See Note)
H-side water level sensor: 80 (h) or more
L-side water level sensor: 80 (h) or more
Repair connector.
Repair connector.
Note1 Note 1. If the display unit is replaced,
˴˴˴carry out "ࠢࠛࡦ㉄ᵞᵺ(citrate washing)".
Page 23
6 – 6
2) Check of tube pump performance
2. How to check performance of sensors (Humidity sensor, Water level sensors and Engine thermistor)
NO
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
YES
Measure the weight of the water tank filled with
water to water level 2.(this weight is A)
Is the connector
between the motor terminal and
board disconnected?
After stopping the operation,
connect/repair the connector.
Press the STOP/CLEAR key
to stop the operation.
Replace the control board.
Replace or repair the tube.
Replace the motor or the pump unit.
Press the STOP/CLEAR key to stop the operation.
Hole of the angle base for the motor
of the tube pump unit
Is it confirmed that the roller, which is observed
through the hole of the angle base for the motor of
the tube pump unit, is rotating?
NOTE: The motor of tube pump operates On
and Off.
Set the water tank to the set and power ON.
Start 11-minute steaming operation.
The 11-minute steam operation is finished (For the last one (1)
minute, the tube pump does not run for dew dissipation.)
Open the door and drop water remaining in the main body into the drip tray. Then close the door again.
Ensure that the drip tray is empty and set it to the main body.
After 20 seconds, remove the drip tray and return accumulated water in the tray to the water tank.
Remove the water tank from the main body.
Confirm that water is flowing at the feed-water inlet
of the engine.
YES
Is there breakage or clogging in the tube?
(Stop the operation.)
Normal
Measure weight of the water tank. (Weight after the operation is B g.)
Is the weight reduction (= A - B) equal to or more than 150 (g)?
Is there a voltage of 110V AC at the motor terminal?
* If the display shows "11 11" during operation, the humidity sensor,
water level sensor and engine thermistor are normal.
So, press the "" key and finish the operation.
YES
YES
NO
YES
NO
NO
Set the water tank, which has been filled with water to the water level 2, to the set and power ON.
(Confirm that there is no water remaining in the oven cavity.)
Set the test mode to 10. (See How to set test mode on page 6-5)
Press the START key.
Microwave heating (for one (1) minute) starts and the Humidity sensor is checked.
C12: Proceed to checking the engine thermistor for failure.
Is Humidity sensor failure (- - 10) indicated?
C02: Proceed to checking the Humidity sensor for failure.
Is water level sensor failure (10 10,10 01, 10 11 or 10 00) indicated?
Go to 1) Checking performance of the water level sensor
in page 6-5.
Normal termination (Indication: 11 11)
Page 24
6 – 7
3. How to check sensor (oven thermistor) performance
4. C01 Oven thermistor failure
I Before starting the P.W.B. unit replacement, make sure to refer to “Before replacing the Printed Wiring Board” in page 2-2.
5. C02 Humidity sensor failure
I Before starting the P.W.B. unit replacement, make sure to refer to “Before replacing the Printed Wiring Board” in page 2-2.
YES
NO
YES
NO
C01: Proceed to checking the oven thermistor for failure.
Power ON the main body.
Press the START key.
Does a measured value for the oven thermistor change as oven heating proceeds?
Is the measured value within ±10 bits with respect to the
reference value after about eight (8) minutes?
Press the [] key to finish the operation.
(This action is required when everything is OK.)
Set the test mode to 03.
(See How to set test mode on page 6-5)
NO
YES
YES
NO
Measure the oven thermistor resistance using a tester with the thermistor connecting
connector pulled out of the board.
The oven thermistor resistance is within its appropriate range.
Is the connector between the oven thermistor and board either disconnected or shorted?
Connect or repair the connector.
Replace the oven thermistor or the harness.
Replace the control unit or the display unit.
Note1
Note 1. If the display unit is replaced,
˴˴˴carry out "ࠢࠛࡦ㉄ᵞᵺ(citrate washing)".
YES
YES
YES
YES
NO
NO
NO
NO
Measure element resistance between the opened and sealed sides of the humid-
ity sensor with the humidity sensor connector disconnected from the board.
Normal resistance of the humidity sensor:
Has the humidity sensor connector been disconnected from the control board?
Connect the connector.
Is the resistance 0?
Replace the humidity sensor.
Replace the humidity sensor.
Replace the humidity sensor.
Is the resistance infinite?
Is the resistance normal?
Replace the control board.
Page 25
6 – 8
6. CO5 Engine high temperature failure
I Before starting the P.W.B. unit replacement, make sure to refer to “Before replacing the Printed Wiring Board” in page 2-2.
7. C12 Engine thermistor failure
I Before starting the P.W.B. unit replacement, make sure to refer to “Before replacing the Printed Wiring Board” in page 2-2.
YES
YES
NO
NO
Measure the engine thermistor resistance using a tester with the thermistor connector
pulled out of the board.
Connect/repair the connector(s) or replace the
thermistor/harness.
The oven thermistor resistance is within its appropriate range.
Is the connectors between the engine thermistor, board and engine mounting section
disconnected or short circuited?
Replace the engine thermistor or the harness.
Replace the control unit and the engine unit
Note 2. If the engine unit is replaced, carry out
"Treatment after engine unit replacement".
Note 2
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
Measure the engine thermistor resistance using a tester with the thermistor
connector pulled out of the board.
Are there disconnection, breakage and short circuit in the engine heater
connections (the engine terminals and board)?
Is the engine heater normal to meet the following requirements?
Insulation resistance: One (1) M or more at 500 VDC
Dielectric strength: 1000 V for one (1) minute
Leakage current: 0.3 mA or less
Resistance (in cold condition): 10.45 to 11.26
Connect/repair the connector(s) or replace the
thermistor/harness.
The latch switch is in the door
open position.
Is there a voltage of
230 - 240V AC
at
each terminal of the E thermostat?
Adjust the latch.
Replace the Engine
thermostat.
Is the connectors between the engine thermistor, board and engine mounting section
disconnected or short circuited?
Connect/repair the terminal(s) or replace the harness.
Replace the engine thermistor or the harness.
Replace the engine unit.
Replace the control board, the display board or the harness.
The engine thermistor resistance is within its appropriate range.
About 200 kW at
About 10 kW at
About 1 kW at
Is there a voltage of 110V AC between the engine heater terminals?
Note 2. If the engine unit is replaced, carry out "Treatment after engine unit replacement".
Note 1. If the display unit is replaced, carry out "ࠢࠛࡦ㉄ᵞᵺ(citrate washing)".
Note 1Note 2
Page 26
6 – 9
[8] Check and remedy in the event of malfunction
1. List
I Before starting the P.W.B. unit replacement, make sure to refer to “Before replacing the Printed Wiring Board” in page 2-2.
OperationTrouble
YES:
Action
Even
with plugged in
When
heating
operation
started
No display
Is there a voltage of about
110V
between the oven lamp terminals.
YES: Replace the oven lamp.
NO: Replace the control unit.
Has the harness between the control unit (CN-D) and the display unit (WH-A) been connected?
NO: Connect the harness.
The door switch is in the door open position (Even with the door closed, the oven lamp does not go out.).
YES: Adjust the door switch.
NO: Replace the control unit or display unit.
Is there a voltage of
110 V
fortheACfanor24VfortheDCfan?
YES: Replace the fan motor.
NO: Replace the control unit.
YES: Adjust the latch.
NO: The latch switch is in the door open position.
The rotary knob does not
function.
No sound
The "˴˴˴˴"key
does not function.
Is there a voltage of about
110V
between the tube pump motor terminals.
YES: Replace the pump unit assembly.(Check the tube pump motor.)
NO: Replace the control unit.
The tube pump motor does
not run.
Has the water tank been inserted all the way?
NO: Insert the water tank or replace the tank or the tank spring.
Replace the control unit.
Reset occurs.
Is there a voltage of about
110V
between the terminals of each of the engine heater and convection heater?
Replace the engine unit assembly (when the engine heater does not function.
Replace the convection heater (when the convection heater does not function).
The engine heater does not
function.
The convention does not
function.
The fan motor does not run.
The oven lamp does not illuminate.
(Note that the lamp
goes out after three (3) minutes
from opening the door.)
(Note that the lamp is off during
fermention mode.)
No backlight for display
illuminates
No key is valid.
Even with the water tank filled
with water, "" is
indicated and heating does not
start.
Has the oven been not operated for 1~30 minutes or more?
Others
NO: Replace the control unit.
Replace the display unit.
Replace the display unit.
Replace the display unit.
YES: Open and close the door.
NO: Has the fuse 20A blown?
YES: Refer to
"
Check in the event of 20A fuse blowing".
NO: Check the display unit, fan motor thermal cut-out,
convection thermal cut-out and engine thermal cut-out.
YES: Replace the control unit or display unit.
YES: Replace the WL joint or the control unit.
YES: Do not use distiled water (ion charged water/ pure water) or Ro water.
Use water suitable for drinking (filtered).
Note 2. If the engine unit is replaced, carry out "Treatment after engine unit replacement". (See page 7-5.)
Note 1. If the display unit is replaced, carry out "ࠢࠛࡦ㉄ᵞᵺ(citrate washing)". (See page 4-7.)
Page 27
6 – 10
2. Check in the event of a fuse 20A blowing
When the fuse F10A was blown, observe the following instruction:
There are many high voltage components in the oven, therefore, except for performing operational check, unplug the power cable before starting
work. For the harness, check for poor caulking, poor connection, etc.
3. Check in the event of no microwave cooking
Check of high voltage sections is very dangerous. Therefore, after the inverter boards (M and AC3) and 110V at the primary terminal are confirmed to
be satisfactory, disconnect the main power and wait for at least one (1) minute before starting the check.
Check of individual components is done with the high voltage circuit wiring disconnected.
*1 Disconnect only the inverter unit terminals M and AC3. Then measure voltage between CN-A pins #1 and #3 (between PD 100 2P and 1P) with an
analog tester while performing heating operation.
*2 If a value measured by a digital tester is unstable, connect a resistor of 10 kΩ to 100 kΩ between the pins #1 and #3 to measure the value.
NO
YES
YES
NO
Replace the inverter unit.
(Function is normal.)
Check is finished.
(The fuse has blown.)
Replace the secondary interlock switch.
Replace the monitor switch and fuse 20A.
Poor insulation of the low voltage parts,
Is there continuity between the COM and NO terminals of the secondary interlock switch when the
door is opened?
Is there continuity between the monitor switch terminals when the door is closed?
Disconnect the 110 volt supply (terminals AC3 and M) to the inverter unit. Operate the oven
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
NO
YESYES
YES
NO
NO
NO
Check
(Inverter unit M, AC3, CN-A and F&FA, and magnetron F and FA)
(Function is normal.)
(Function is normal.)
(Function is not normal.)
(Function is not normal.)
Is there a voltage of 110V between the primary
terminal ends of the inverter unit?
Replace the control unit.
Is there a voltage of about 0.4 - 0.5V DC between the
inverter CN-A pins #1(negative) and #3 (positive)?
*1,*
2
Adjust the latch base angle.
Check the secondary interlock switch.
In this case, check the high-voltage
diodes (D120 and D121) of the
inverter unit for a short circuit.
Replace the magnetron.
Check is finished.
Is the secondary interlock switch ON?
Is there a continuity between the antenna switch
terminals?
Is there a history of the antenna motor rotation
error in the test mode 02?
Antenna motor rotates.
Replace the antenna motor.Replace the antenna switch.
Is the fan motor running?
Is there a voltage of about 110V between the fan
motor terminal ends?
Replace the fan motor.
Is wiring on the high voltage side correct?
Have the terminals been completely inserted?
Correct the wiring.
Completely insert the harnesses.
Is there continuity between the magnetron terminals?
Is there a short circuit between the magnetron heater
terminal and any metal part of the magnetron body?
Are the magnetron cooling fins easily deformed?
Has the magnet cracked?
Replace the inverter unit.
Page 28
6 – 11
4. How to check input voltage at the primary terminal of the inverter board
Measure voltage between the terminal (BLU/BLU) and the terminal (RED) of the inverter unit.
Terminal (BLU/BLU) of the inverter unit
Terminal (RED) of the inverter unit
Page 29
6 – 12
[9] TEST MODE
How to operate test mode
No.Test nameDetail of testOutputExample of display
0 A/D data monitorFollowing A/D data is displayed.OFFWater level sensor :high
The display of A/D data is changed by pushing 䇼ᚻേടᾲ䇽key.㵘䋱䋰㵘䌘䌘Measurement data㵘XXBit
䉡䉤䊷䉺䊷
(1) water level sensor: high
㸣Water level sensor :low
(2) water level sensor: low㵘䋲䋰㵘䌘䌘Measurement data㵘XXBit
㸣䉡䉤䊷䉺䊷
(3) oven thermister䋨oven mode and fermentation mode䋩
㸣
Oven thermister level
(4) engine thermister㵘䌘䌘㵘䌙䌙Oven mode㵘XXBit㸣䉥䊷䊑䊮Fermentation mode YYBit
return to (1)
Engine thermister level
㵘䋴䋰㵘䌘䌘Measurement data㵘XXBit
䉫䊥䊦
1 Frequency of power supplyFrequency of power supply is displayed.OFF
Frequency of power supply
Buzzer beeps for 2 sec after checking frequency.
㵘䌟䌟㵘䋶䋰60Hz
(The display is kept.)
Address setup mode
2 EEPROM data
by pushing 䇼ᚻേടᾲ䇽EEPROM check sum is displayed.
Address
02
by pushing 䇼ᚻേടᾲ䇽㹢䇼䉴䉺䊷䊃䇽EEPROM data is written and
㵘䋰䋲㵘䌄䋰Data
䌄䋰
updated checksum is displayed.(address range is 10h-FFh.)
䊧䊮䉳
by pushing 䇼䈏䉍䂦䇽address is incresed.(+1)
by pushing 䇼䈏䉍䂰䇽address is decresed.(-1).
*Reference address range is 00h to FFh.
by pushing䇼䉴䉺䊷䊃䇽setup moves EEPROM data edit mode
EEPROM data edit mode
by pushing 䇼䈏䉍䂦䇽data is incresed.(+1)
Address
02
by pushing 䇼䈏䉍䂰䇽data is decresed.(-1)
㵘䋰䋲㵘䌄䋰Data
䌄䋰
by pushing 䇼䉴䉺䊷䊃䇽data is written into EEPROM and return address setup mode.
㵘㵘䉥䊷䊑䊮
Convection heater
3 Thermister(oven) checkThe oven heating at 170㷄 start and the display shows
CMStandard data㵘XXBit
standard data and measurement data of oven thermister at 170㷄.
(OL) AM㵘䌘䌘㵘䌙䌙Measurement data㵘YYBit
DC fan(cooling)
Exhaust fan
RY1, (OL)
4 Safety checkCook relay and fan work for 60sec.
FM, AM
For Insulation resistance inspection
The oven lamp key works.
DC fan(cooling)㵘䋰䋰㵘䋰䋰
and withstanding voltage test
DC fan(ventilation)㵘㵘㵘㵘ടᾲ
Exhaust fan
5 software versionSoftware version is displayed.
OFFVersion
᳒XųXX䌘XXX
Engine heater, (OL),AM
6 water drainPushing 䇼䈅䈢䈢䉄䉴䉺䊷䊃䇽 key water draining works.
PM, RY1ถط
If water exist in the water tank, display appeares"U 11.".
FMų Ყ᳙ų᳙᳙
DC fan(cooling)ųųųųь༏ɶ
Exhaust fanųųஜ˳൦৷Ɩ
Water draining finishes for 80sec.. (max. working time is 7min 20sec.)OFF
ų ᳙᳙ų᳙Ც
ųųஜ˳൦৷Ɩ
7 CONSUMPTION CHECKOutput switches by key operation.
䌏䌆䌆
direct select key :䇼䈏䉍䂦䇽
If no key operation continues for 60sec, output turns off .
㵘䋰䋰㵘䋰䋰Waiting condition
㵘㵘㵘㵘
䇼䈏䉍䂦䇽keyEngine heater, RY1
䊶Engine heater mode with temperature control by Engine thermistorFM䋬(OL)
DC fan(cooling)㵘䋰䋰㵘䋰䋱
Exhaust fan⫳䈚‛㵘㵘ടᾲ
PM,AM
䇼䉴䉺䊷䊃䇽key
Convection heater, RY1
CM,(OL)
䊶C01 is displayed when oven thermister is defect.
DC fan(cooling)ų ᲫᲫųᲪᲪ
Exhaust fanǪȸȖȳࢊь༏ɶ
AM
䇼ᚻേടᾲ䇽key
Convection heater, RY1
CM,(OL)
䊶C01 is displayed when oven thermister is defect.
DC fan(cooling)㵘䋰䋱㵘䋰䋰
Exhaust fan䉥䊷䊑䊮㵘ടᾲ
AM
Oven thermister error
㵘㵘䌃㵘䋰䋱
䇼ᐶౝἮ䇽keyInverter unit
FM䋬(OL),AM
DC fan(cooling)㵘䋱䋰㵘䋰䋰
DC fan(ventilation)䊧䊮䉳㵘ടᾲ
Exhaust fan, RY1
Within 2 sec.
(Power on and door closed )
[][][][OPEN DOOR]Version No. is displayed.(Test number is selected by encoder)[]
[
or push direct select key
]
䊶Convection heater mode with temperature control at 250㷄.
䊶Convection heater mode with temperature control at 45㷄.
䊶Microwave mode at full power.
Page 30
6 – 13
8
䋭
9t
10
I
A
11
12
Monitor key, 60tim es speed key and s tage cancel key are ava ilabl e until
power turn off.
Without cleaning cycle
Microwave mode w orks for 1 mi n and dis play s hows H umidity s ensor lev el.
After 1 mi n Judgment appears i n the displ ay.
䊶Acceptable l evel: less than 10 bit
䊶When Humidity sensor is defect "1111"appears in the dis play.
After 16 sec Humidity ladder adjustment starts.㵘㵘
㸣㵘Humidity sensor max. level for 1sec is displayed.
"䋭䋭㵘䋰䋱" appears when AM or Antenna switch is defect.
And test mode doesn't continue.
After 1min judgment OK: less than 16 bit. Turn to steam mode.
NG: more than 16bit
"䋭䋭㵘䋱䋰" appears when AH sensor is defect or
Humidity sensor level is more than 16bit.㵘
And test mode doesn't continue.
FM䋬(OL)
DC fan(cooling)
DC fan(ventilation)
Exhaust fan, RY1
AM
Inverter unit
FM䋬(OL)
DC fan(cooling)
DC fan(ventilation)
Exhaust fan, RY1
AM
Engine heater
PM
FM, (OL)
DC fan(cooling)
DC fan(ventilation)
Exhaust fan
RY1
AM
(2)steam mode
Steam mode(high) works for 20min.(water tank level is high.)
㵘㵘䊶Check the water level when operation starts.
㵘㵘䊶Check if the water level change from high to low.
㵘㵘䊶Check the engine thermister works correctly.(open / short check)
㵘㵘䊶Check if Humidity sensor level is more then 16 bit.
㵘㵘䊶"䉦䊨䊥䊷䉻䉡䊮" display appears after EEPEOM(2) min.
(3)Judgement
OK11 11 Water level sensor, Engine thermistor and Humidity sonsor is OK.
OFF
Regarding NG, please refer to the below table "The detail of judgment
䋨test no.10)".
Humidity sensor check
without load 㹢
steam mode check
(water level sensor check)
direct select key :䇼ᐶౝἮ䇽
how to operate at production line
power on
㸣
䇼䈏䉍䂰䇽
㸣
䇼ᚻേടᾲ䇽
㸣
䇼ᚻേടᾲ䇽
㸣
䇼ᐶౝἮ䇽
㸣
test start
(4)Shortcut to the test mode 06
When OK display (1111) and "䉦䊨䊥䊷䉻䉡䊮" display appears,
stand-by mode of test mode turns by opening the door
Before pushing 䇼䈅䈢䈢䉄䉴䉺䊷䊃䇽 key, water tank should be removed.(Refer
to test mode 06)
By push 䇼䈅䈢䈢䉄䉴䉺䊷䊃䇽Microwave leakage test starts.
Antenna works continuously for 90 secs.
If testmode 11 is left for 90secs at some mode,
test mode 11 finishes and turn to 0 display.
Microwave mode at full power works for 5 min.
When 䇼䈏䉍䂦䇽 or 䇼䈏䉍䂰䇽 key is pushed during heating PWM signal
is changes as follows;
䋨By pushing "ขᶖ䈚" key, oven lamp lighting mode is memorized into EEPROM.䋩
When EEPROM is defect display shows "C14".
Adjustment of full power
at microwave mode
direct select key :䇼ᚻേടᾲ䇽
Microwave leakage test
Caution:
Make sure the followings before
operation.
1.Temperature in the oven
is low.
㵘Oven thermistor level
in lower than 12(h).
2.Something is put in the oven.
Inverter unit
FM䋬(OL)
DC fan(cooling)
DC fan(ventilation)
Exhaust fan, RY1
AM
Inverter unit
FM䋬(OL)
DC fan(cooling)
DC fan(ventilation)
Exhaust fan, RY1
AM
OFF
monitor mode
Humidity sensor check without
load
direct select key :䇼䈏䉍䂰䇽
䋭
Inverter unit
FM䋬(OL),AM
DC fan(cooling)
DC fan(ventilation)
Exhaust fan, RY1
OFF
No.
Test mode
Detail of test
outputExample of display
䋭
Checking
Detected Humidity
㵘䋰䌁㵘䋰䋳sensor level: 3 Bit
䊧䊮䉳㵘ടᾲ
Check end䋨Passing䋩
Detected Humidity
㵘䋰䌁㵘䋰䋳
sensor level: 3 Bit
䊧䊮䉳㵘㵘㜞
Check end䋨Failing䋩
㵘䋱䋱㵘䋱䋱
䊧䊮䉳㵘㜞More than 10 Bit
Error
Humidity judgment level is displayed.
㵘䋱䋰㵘䋰䋰
ടᾲ
AH level is displayed.
Judgment㵘16 bit
㵘䋱䋰㵘䋰䋹Example:Detection 9 bit
䊧䊮䉳ടᾲ
The maximum value is
displayed by the hexadecimal
Error display
number.
㵘䋭䋭㵘䋱䋰
More than 16 Bit
㵘䋰䋰㵘1䋰
⫳䈚‛ടᾲ
Judgment
ᴎᴳᴰᴈᴘᴶᴋᴵ
OK
㵘䋱䋱㵘䋱䋱
⫳䈚‛ടᾲ
NG
㵘䋰䋱㵘䋰䋰Water level sensor (high)
is defect.
ᴎᴳᴰᴈᴘᴶᴋᴵ
ųᲫᲫųᲫᲫ
ᔕƠཋ ь༏ɶ
ų ᳙ᲫųᲬᲭ
ų ᳙᳙ų᳙Ძ
ȬȳǸ ь༏ɶ
㵘䌟䋭㵘䋰䋰
ടᾲ 䊧䊮䉳㵘ᒙ
When 䇼䈏䉍䂦䇽key pushed 3 times.
ȓǿȟȳ܍
After offset is written into
㵘䌟䌟㵘䌟䋳
EEPROM
ടᾲ 䊧䊮䉳㵘ᒝ
(1)Humidity sensor check without load
By push 䇼䈅䈢䈢䉄䉴䉺䊷䊃䇽Humidity sensor check starts.
"䋭䋭㵘01" appears when Antenna is defect.
And test mode doesn't continue.
䋭-㵘䋱䋰immediate steam heatingnot judgednot judgedNGOKHumidity sensor is defect.
䋭-㵘䋰䋱micro heating works for 16 sec not judgednot judgednot judgedNGAntenna motor or switch is defect.
䋰䋰㵘䋰䋰during steam heating modeunder checkingNGunder checkingOKEngine heater is defect when error appears after 30 sec.
䋰䋰㵘䋰䋰during steam heating modeunder checkingNGnot judgedOK䌅ngine thermistor is defect(short)
䋱䋱㵘䋰䋰during steam heating modeOKNGnot judgedOK䌅ngine thermistor is defect(short/open)
䋱䋱㵘䋰䋱during steam heating modeOKNGOKOK䌅nginethermisotrisdefect(short/open)
䋰䋰㵘䋱䋰during steam heating modeunder checkingunder checkingunder checkingOKOven thermistor is defect(open)
䋱䋰㵘䋰䋰immediate steam heatingno waternot judgedunder checkingOKNo water
䋱䋰㵘䋱䋰during steam heating modeNGOKunder checkingOKBoth water level sensor is off at the same time.
䋱䋰㵘䋰䋱during steam heating modeNGunder checkingOKOKBoth water level sensor is off at the same time.
䋱䋰㵘䋱䋱during steam heating modeNGOKOKOKBoth water level sensor is off at the same time.
䋰䋱㵘䋰䋰immediate steam heatingshortage of water not judgednot judgedOKWater shortage
䋱䋰㵘䋰䋰during steam heating modeNGunder checkingunder checkingOKWater sensor level change is inverted 䋨H:ON䇮䌌:OFF䋩
䋱䋱㵘䋱䋰steam heating works for 20 min OKOKNGOKHumidity sensor does not detect steam.
Antena motor
or switch
No.Test modeDetail of testOutput
13 Last menu monitorThe last operation is displayed.䌏䌆䌆
Power detect standby.
by push 䇼䉴䉺䊷䊃䇽Microwave pawer detect starts.
15 Descale number of timesD escalenum berdisplay m ode䌏䌆䌆
of executionDescale number is dissplayed.
by push 䇼䉴䉺䊷䊃䇽setup moves descale number clear mode.
D escale num berclearm ode䌏䌆䌆
by pushing 䇼䉴䉺䊷䊃䇽number is cleared and return descale number display mode.
Example of display
ȬȳǸMicrowave
ų ᳙ᲯЎᲪ0 ᅺ5min
Ჲ00W 800W
ȬȳǸ
ų ᲫᲮЎᲭᲪᅺ
ь༏ɶ ȬȳǸ
ų᳙4Ў00ᅺ
800W
ų᳙᳙ų1010 times
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Service Manual
CHAPTER 7. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
[1] WARNINGS
Please refer to “OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS”, when carrying out any of the following removal procedures:
[2] OUTER CASE REMOVAL
To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
3. Open the oven door and block it open.
4. Remove the one (1) screw holding the steam cap to the outer case
cabinet (back side).
5. Remove the seven (7) screws from the rear side of outer case.
6. Slide the entire outer case back out about 1 inch (3 cm) to free it
from retaining clips on the cavity face plate.
7. Lift entire outer case from the unit.
8. Now, the outer case with the steam cap is free.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
WAIT FOR 60 SECONDS BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
[3] BACK PLATE REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE
REMOVAL”.
3. Open the oven door and block it open.
4. Remove the one (1) screw holding the side angle to the back plate.
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result
in severe, possibly fatal, electric shock.
(Example) Inverter unit, Magnetron, High Voltage Harness etc..
WARNING:
Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
WARNING AGAINST HIGH VOLTAGE :
1. Disconnect the power supply cord.
2. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operating the oven.
Do not operate the oven if any of the following conditions exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
To prevent an electric shock, take the following precautions.
1. Before wiring,
2. Do not let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, Inverter unit and High voltage capacitor .
2) Hot parts:
Oven lamp, Magnetron, Inverter unit and Oven
cavity.
WARNING FOR WIRING
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange and
other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked and
make sure that the wire leads do not come off even if the
wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Circuit Diagram.
1) Disconnect the power supply cord, and then remove
the outer case and the back plate assembly.
2) Open the door and block it open.
3) Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4) Disconnect the high voltage wire from the magnetron
terminal with insulated pliers.
5) Make the terminal (metal part) of the high voltage wire
contact to the magnetron body with insulated pliers.
6) Now, the capacitors of the inverter unit are discharged.
7) Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING : Use the pliers that the portions of their
handles are insulated completely to
avoid an electric shock.
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7 – 2
5. Remove the two (2) screws holding the back plate to the rear
angle.
6. Remove the four (4) screws fixing the back plate.
7. Now, the back plate with exhaust cover is free.
[4] DOOR ASSEMBLY REPLACEMENT
1. REMOVAL
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
3. Remove the outer case cabinet, referring to “OUTER CASE
REMOVAL”.
4. Remove the dew tray
5. Disconnect the 12-pin connector of the control panel harness.
6. With the door open 45°, push the door cam down and back and
then slowly open the door to remove it.
7. With the door open more than 106°, slide the door left from the
hinge pin slot to remove it.
NOTE: Be careful not to make the 12-pin harness caught in the
square hole of the oven.
Be careful when installing the door, since the door cam is easily pulled in the back of the oven.
After replacing the door or loosening/removing the hinge
screws, make sure to adjust the door.
2. REINSTALL
1. To facilitate reinstallation, first put the hinge pin in the right hinge.
CAUTION: If bent, the comb-shaped teeth should be straighten (other-
wise, microwave leakage may result.)
After replacing or repairing the door, ensure that there is no
microwave leakage (otherwise, microwave leakage may
result).
Always make latch adjustment (otherwise, malfunction may
result)
3. After any service to the door
1) Make sure that the door sensing switch, the secondary interlock
switch and the monitor switch are operating properly. (Refer to
chapter “Test Procedure”.)
2) An approved microwave survey meter should be used to assure
compliance with proper microwave radiation emission limitation
standards.
[5] DOOR COVER REMOVAL AND DOOR PACKING INSTALLATION
1. DOOR COVER REMOVAL
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
3. Put a putty knife (thickness of about 0.5mm) into the gap between
the door cover and the door frame (for tab positions, refer to photo).
First disengage four(4) tags on the right side, four(4) tags on the left
side, and six(6) tags on the front side.
4. Lift up the this side of the door cover. And disengage the center tab
and the seven (7) tabs on the back side. If it is difficult to disengage
the seven (7) tabs on the back side, remove the door packing.
5. Remove the door packing from the door cover.
6. Following the above steps 3, 4 and 5 can remove the door cover
without breaking it.
NOTE: * Embed the entire circumference of the door packing in the
door cover and then fit the door packing with the door
frame.
* After assembling, press the entire circumference of the
door packing so that the door packing is in a uniform condition without protrusion.
* Be careful not to damage the surface.
* After assembling, check that there is no microwave/steam
leakage from the door.
2. DOOR PACKING INSTALLATION
1. Turn the door cover over.
2. Install the four (4) corners of the door packing into the four (4) corners of the door cover opening.
3. As the cross section of the door cover opening is T character type,
put the door packing over the door cover opening.
Panel R
Handle
Slide to left
Door Cam
Door Cam
106º
Door Cover
Door packing
This side
Positions of tabs
Right sideLeft side
Door cover
Center tab
Magnified picture of the door packing
Groove of
the door packing
Door packing
Reverse side of the door cover
T character part of the door cover
Magnified picture of the door cover
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7 – 3
4. Carry out the procedure of item 3 around all the circumferences of
the door cover opening.
5. Turn the door cover over again.
6. Put the door packing over the door cover opening if there are any
portions that the door packing is not put correctly.
7. Make sure that the door packing is not tight or not slack. And make
sure that the door packing is put uniformly around all the circumferences of the door cover opening.
NOTE: 1) Do not scratch the door cover and the door packing.
2) After the door and the oven are assembled, carry out the
microwave leakage measurement test and make sure that
there is no leakage of steam.
[6] DOOR ADJUSTMENT
When removing and/or loosening the oven hinges such as in door
replacement, the following adjustment criteria are taken.
Door adjustment is performed with the door properly installed and
closed and while the oven hinges are loose.
1. Loosen the screws holding the oven hinge right and the oven hinge
left to the bottom plate with screwdriver.
2. Insert a spacer of 0.8mm in thickness between the door sealer section (lower portion) and the front plate.
3. Adjust the door by moving it so that the door is parallel with the
oven cavity front plate lines (right and left side lines) and the door
latch heads pass through the latch holes correctly.
4. Tighten the screws holding the right oven hinge to the bottom plate.
Then tighten the screws holding the left oven hinge to the bottom
plate.
5. Adjust the latch (see [8]).
NOTE: In order to prevent deformation of parts, lay a soft mat and
then turn the unit on it.
1. After adjustment, make sure of the following:
1. The door latch heads smoothly catch the latch hooks through latch
holes and the latch heads goes through center of latch holes.
2. The door is positioned with its face pressed toward oven cavity
front plate.
3. Reinstall the outer case cabinet and check for microwave leakage
around the 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 elec-
tronic seal preventing the leakage of microwave energy from
the oven cavity during cook cycle. This function does not
require that the door be airtight, moisture (condensation)-tight
or light-tight. Therefore, occasional appearance of moisture,
light or sensing of gentle warm air movement around the oven
door is not abnormal and do not of themselves indicate a leakage of microwave energy from the oven cavity. If such were
the case, your oven could not be equipped with a vent, the
very purpose of which is exhaust the vapor-laden air from the
oven cavity.
[7] DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
REPLACEMENT
1. REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Wait for 60 seconds to discharge the high voltage capacitor of the
inverter unit.
5. Disconnect the wire leads from the switch.
6. Keep extending the two stopper tabs holding the switch to the latch
base angle and revolve the switch on the pole.
7. Remove the switch from the latch base angle.
8. Now, the switch is free.
2. REINSTALLATION
1. Reinstall the switch in its place. The door sensing switch is in the
upper position of the latch base angle. The monitor switch is in the
lower position of the latch base angle. The secondary interlock
switch is in the middle position of the latch base angle.
2. Reconnect the wire leads to the switch.
3. Make sure that the monitor switch is operating properly and check
continuity of the monitor circuit. Refer to chapter “Test Procedure
and Adjustment” procedure.
Screws
Screws
Door cam
Door cam
Sealer
Oven
cavity
front
Spacer
Stopper tab
Stopper tab
Stopper tab
Door sensing switch
Secondary interlock switch
Monitor switch
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[8] DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
ADJUSTMENT
1. Adjustment
If the door sensing switch, secondary interlock switch and monitor
switch do not operate properly due to a misadjustment, the following
adjustment should be made.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE
REMOVAL”.
3. Open the oven door and block it open.
4. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
5. Loosen two (2) screws holding the latch base angle to the oven
cavity front plate.
6. With door closed, adjust the latch base angle by moving them back
and forth, and up and down. In and out play of the door allowed by
the latch base angle should be less than 0.5 mm.
The position of the latch base angle should be adjusted so that the
plungers of the door sensing switch, the secondary interlock switch
and the monitor switch are pushed with the door closed.
7. Secure the screws firmly.
8. Check all of the switches operation. If each switch plunger has not
been pushed with the door closed, loosen the screws and adjust
the position of the latch base angle.
2. After adjustment, check the following.
1. In and out play of the door remains less than 0.5 mm when in the
latched position. First check the position of the latch base angle
pushing and pulling right portion of the door toward the oven face.
Then check the position of the latch base angle, pushing and pulling left portion of the door toward the oven face. Both results (play
in the door) should be less than 0.5 mm.
2. The door sensing switch and the secondary interlock switch open
within 3.0mm gap between the oven door and cavity face.
3. The monitor switch contacts (NC and COM) close when the door is
opened.
4. Reinstall the outer case cabinet and check for microwave leakage
around the door with an approved microwave survey meter. (Refer
to Microwave Measurement Procedure.)
[9] BOTTOM PLATE ASSEMBLY REMOVAL
Before the control unit, noise filter unit, inverter unit, fan motor and
magnetron are replaced, removal of the bottom plate is required.
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
7. Pull the reservoir (feed reservoir assembly) out of the set.
8. Remove the dew tray and drain accumulated water from the tray.
9. Disconnect the wire leads from the convection motor, the thermal
cut-out (convection) and the thermal cut-out (Fan).
10.Remove the motor angle from the filter cover by removing the one
(1) screw and releasing the one (1) tab.
11.In order to remove the bottom plate assembly, turn over the unit.
NOTE: When turning over the unit, first place its left or right side
down and then the top side down (otherwise, the convection motor and/or convection duct will be damaged).
12.Remove the nine (9) screws fixing the bottom plate assembly (bottom face) to the left heat shield plate, the right heat shield plate, the
left hinge assembly, the right hinge assembly and the front plate of
the oven.
13.Place the oven right side down. And open the bottom plate assembly from the oven.
14.Disconnect the two (2) blue connectors from the blue connectors of
the control harness and the main harness which are installed in the
heat cover R assembly.
15.Take the snap bands tying the harnesses out of the hole of the bottom plate.
16.Lift the bottom plate assembly to remove it from the oven body.
NOTE: In order to prevent the fan duct covering around the mag-
netron terminal from hitting the terminal, slightly shift the
bottom plate assembly toward the left hinge assembly
and then lift the bottom plate assembly.
[10] ENGINE UNIT REMOVAL
1. ENGINE UNIT REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
Mounting screws of bottom plate assembly
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7 – 5
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
7. Remove the water tube from the engine unit assembly.
CAUTION: When the water tube is removed from the engine unit,
remained water may bleed from the engine unit.
8. Remove the two (2) screws holding the latch base angle.
And remove the latch base angle.
9. Remove the wire harness from the heater terminal of engine unit
assembly by removing the two (2) screws.
10.Disconnect the engine thermistor from the wire harness.
11.Remove the one (1) screw holding the thermo mounting plate to the
heat cover-right assembly.
12.Remove the one (1) screw holding the engine unit assembly to the
heat cover-right assembly.
13.Remove the three (3) screws which are holding the engine unit
assembly from inside of the oven cavity.
14.Now, the engine unit assembly is free.
CAUTION: When the new engine unit is installed, the thermistor
(engine) and engine packing B should be reinstalled.
2. TREATMENT AFTER ENGINE UNIT REPLACE-
MENT
After the new engine unit assembly is installed, carry out the following
three procedures to avoid the error operation.
1. At first, fill the tank assembly with water and carry out
“ (steam cooking)” with manual operation for about five (5)
minutes, referring to operation manual.
2. Then, carry out “ (drain water function)”.
3. At last, fill the tank assembly with water and carry out
“ (steam cooking)” again for about ten (10) minutes. And
check that the error does not appear on the display.
4. If the error is appeared and the oven stops at above step 1, carry
out step 2 and step 3.
REASON
Inside walls of the engine unit assembly have been painted to protect
the engine unit assembly with special paint. And special paint will shed
water initially. By carrying out Steam cooking, paint can be accustomed to water. If this operation is not carried out, the oven will judge
that there is no water in the tank assembly. And the display will show
the error and then the oven will stop.
Because this oven judges that there is water or not by checking on/off
time ratio of the engine unit assembly.
If paint is not accustomed to water, off time will become longer than on
time. At this time, the oven will judge no water.
[11] TUBE PUMP ASSEMBLY REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
7. Remove the four (4) screws holding the side angle.
8. Remove the side angle.
9. Remove the two (2) screws holding the latch base angle.
10.Remove the latch base angle.
11.Remove the wire harness from the oven lamp, pump motor and WL
joint (Upper).
12.Remove the engine unit assembly, referring to “ENGINE UNIT
ASSEMBLY REMOVAL.”
13.Disconnect the DC fan motor (cooling) connector. Then remove the
motor angle mounting the DC fan motor (cooling) from the filter
cover (by removing the one (1) screw).
14.Straighten the tags of the front plate of the oven fixing the panel R.
If screw clamping has been applied, remove the one (1) screw.
15.Open the door
16.Pull the right panel R upward and remove it from the front plate of
the oven.
17.Remove the one (1) screw fixing the tank cover to the front plate of
the oven from the front.
18.Remove the one (1) screw fixing the tank cover to the right heat
shield plate assembly.
19.Remove the one (1) screw fixing the tube pump assembly to the
right heat shield plate assembly.
20.Disconnect the display board harness from the control harness.
21.Disengage the control harness connector from the tank cover tags.
22.Remove the drain tube from the exhaust fan motor (sirocco motor)
by loosening the hose band.
23.Remove the tank cover (tank cover assembly) with the tube pump
assembly installed from the set.
24.Remove the one (1) screw fixing the tube pump assembly to the
tank cover.
25.Pull the tube pump assembly out of the tank cover.
26.Disconnect the drain tube from the tube pump assembly by loosening the hose band.
NOTE: Before installing the tube pump assembly, ensure that the
water supply tube and the drain tube have been connected to
the pipes of the tube pump assembly.
[12] DC FAN MOTOR (Ventilation) REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
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7 – 6
7. Reconnect the high voltage wire to the magnetron terminal after
discharging.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
8. Remove the four (4) screws holding the side angle.
9. Remove the side angle.
10.Remove the two (2) screws holding the latch base angle.
11.Remove the latch base angle.
12.Remove the tube pump assembly, referring to “TUBE PUMP
ASSEMBLY REMOVAL”.
However, the tube pump assembly does not need to remove from
the tank cover.
13.Remove the two (2) screws holding the DC fan motor to the heat
cover right assembly.
[13] CONVECTION UNIT ASSEMBLY
1. CONVECTION UNIT REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after
discharging.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
8. Remove the wire harness from the convection heater by removing
the two (2) screws.
9. Remove the wire harness from the convection motor.
10.Remove the two (2) screws holding the water proof angle to the
oven cavity.
11.Remove the ten (10) nuts holding the convection unit to the oven
cavity assembly.
12.Now, the convection unit is free
2. CONVECTION HEATER REMOVAL
1. Remove the convection unit from oven the cavity assembly, referring to “CONVECTION UNIT REMOVAL”.
2. Remove the two (2) screws holding the convection heater to convection duct.
3. Remove the convection heater from the two (2) heater mounting
plates.
4. Remove the convection heater from the convection duct.
5. Now the convection heater is free.
3. CONVECTION MOTOR REMOVAL
1. Remove the convection unit from oven the cavity assembly, referring to “CONVECTION UNIT REMOVAL”.
2. Remove the duct divide plate from the convection cover.(Remove
the one (1) mounting screw.)
3. Remove the convection cover angle assembly from the convection
cover. (Release the tab and remove the one (1) mounting screw)
4. Remove the convection cover angle C from the convection cover.
(Release the tab and remove the one (1) mounting screw)
5. Remove the fan blade from the convection motor shaft by removing
the one (1) nut, three (3) washer and one (1) spacer.
6. Remove the convection motor mounting angle from the convection
cover by removing the two (2) screws.
7. Remove the convection motor from the convection mounting angle
by removing the two (2) screws.
8. Remove the one (1) ring from the convection motor shaft.
NOTE: If the ring, when removed, has been deformed, replace it with
new one. Using any deformed ring causes unbalanced rotation of the cooling fan.
9. Now, the convection motor is free
[14] MAGNETRON REPLACEMENT
1. REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
7. Remove the bottom plate, referring to “BOTTOM PLATE
REMOVAL”.
8. Disconnect the wire leads from magnetron.
9. Remove the two (2) screws holding the bottom shield plate to the
oven cavity with the magnetron.
10.Remove the two (2) screws holding the magnetron to the
waveguide.
11.Remove the magnetron from waveguide.
12.Now, the magnetron is free.
2. REINSTALLTION
1. Reinstall the magnetron to waveguide flange with the two (2)
screws.
2. Reinstall the bottom shield plate with magnetron by the two (2)
screws.
3. Reinstall the bottom plate assembly to the oven with eleven (11)
screws.
4. Reconnect the wire leads to the magnetron, convection heater,
convection motor and thermal cut-outs.
5. Reinstall outer case and check that the oven is operating properly.
CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE THE
R.F. GASKET IS IN PLACE AND THE MAGNETRON
MOUNTING SCREWS ARE TIGHTENED SECURELY.
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7 – 7
[15] SIROCCO MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
3. Remove the outer case cabinet, referring to “OUTER CASE
REMOVAL”.
4. Remove the one (1) screw fixing the sirocco motor to the steam
duct ORG.
5. Hold the left end of the sirocco motor and pull it toward you to
remove it from the steam duct.
6. Remove the drain tube from the sirocco motor by loosening the
hose band.
[16] ANTENNA MOTOR AND ANTENNA SWITCH REMOVAL
The antenna motor and the antenna switch can be changed with the
cabinet installed.
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
3. With the unit upside down, cut the six (6) ribs of the bottom plate so
as to partly cut off the bottom plate.
NOTE: When installing, install some cut parts by adding the two (2)
screws (XHTS740P08000).
1. ANTENNA MOTOR REMOVAL
4. Disconnect the terminal from the antenna motor.
5. Remove the two (2) antenna motor screws and remove the antenna
motor.
2. ANTENNA SWITCH REMOVAL
4. Disconnect the terminals from the antenna motor and the antenna
switch.
5. Remove the two (2) screws holding the TT motor mounting angle to
the oven cavity bottom plate.
6. Remove the TT motor mounting angle (with antenna motor and
antenna switch) from the oven cavity bottom plate.
7. Remove the one (1) screw holding the antenna switch to the TT
motor mounting angle.
[17] POWER SUPPLY CORD REPLACEMENT
1. Removal
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are
insulated completely to avoid an electric shock.
7. Remove the bottom plate assembly, referring to “BOTTOM PLATE
ASSEMBLY REMOVAL”.
8. Remove the one (1) screw holding the filter cover to the bottom
plate.
9. Straighten the tab of the bottom plate holding the filter cover to the
bottom plate.
10.Remove the filter cover from the bottom plate.
11.Remove the one (1) nut holding the earth wire of the power supply
cord to the bottom plate.
12.Disconnect the wire leads of the power supply cord from the noise
filter unit.
13.Remove the power supply cord from the square hole of the bottom
plate.
2. Installation
1. Insert the moulding cord stopper of the power supply cord into the
square hole of the bottom plate, referring to the figure.
2. After inserting the moulding cord stopper, slide it to the right side.
3. Install the earth wire lead of the power supply cord to the bottom
plate with the one (1) nut. And tight the nut.
4. Connect the wire leads of the power supply cord to the noise filter
unit correctly, referring to “CIRCUIT DIAGRAMS”.
5. Reinstall the filter cover to the bottom plate with the one (1) screw.
6. Hold the filter cover to the bottom plate by bending the tab of the
bottom plate.
7. Reinstall the bottom plate assembly to the oven.
8. Reconnect all leads removed from components during testing.
9. Reinstall the outer case and the back plate assembly.
10.Reconnect the power supply cord after the outer case and the back
plate assembly are installed.
11.Run the oven and check all function.
Steam duct ORG
Steam duct cover ORG
Steam duct angle
Screw
Sirocco motor
1
2
Power supply cord
Bottom plate
Square hole
Moulding cord stopper
Page 39
7 – 8
[18] INVERTER UNIT ASSEMBLY REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are insu-
lated completely to avoid an electric shock.
7. Remove the bottom plate, referring to “BOTTOM PLATE
REMOVAL”.
8. Disconnect the wire leads and the connectors from the inverter unit
assembly.
9. Remove the one (1) screw earthing the inverter unit assembly to
the bottom plate.
10.Remove the two (2) screws holding the inverter unit assembly to
the bottom plate.
11.Remove the inverter unit assembly from the bottom plate.
12.Now, the inverter unit assembly is free.
[19] CONTROL UNIT REMOVAL
1. Disconnect the power supply cord, and then remove the outer case
and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with
insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to
the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNING: Use the pliers that the portions of their handles are insu-
lated completely to avoid an electric shock.
7. Remove the bottom plate, referring to ÅgBOTTOM PLATE
REMOVALÅh.
8. Disconnect the wire leads and the connectors from the control unit.
9. Remove the one (1) screw earthing the control unit to the bottom
plate.
10.Remove the two (2) screws holding the control unit the PWB
holder.
11.Remove the control unit from the PWB holder.
12.Now, the control unit is free.
NOTE: After the control unit is reinstalled, make sure that the main
harness, the control harness and the humidity sensor harness
are held with the one (1) wire holder and the one (1) purse
lock LL as shown in the picture.
[20] DISPLAY UNIT REPLACEMENT
When the display unit is replaced, carry out " “ citrate
washing).
Because If the display unit is replaced, the number of times for
" “(citrate washing) is not taken over to new display unit.
Screw
Screw of earting
Bottom plate assembly
Wire holder
Purse lock LL
Control unit
Screw
Screw of
earting
Inverter unit
aseembly
Screw
Page 40
8 – 1
Service Manual
CHAPTER 8. 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/cm
2
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.
Microwave leakage measurement at 5 cm distance
mW cm
2
mW cm
2
Page 41
9 – 1
Service Manual
CHAPTER 9. CIRCUIT DIAGRAMS
[1] PICTORIAL DIAGRAM
1. CONTROL UNIT
2. DISPLAY UNIT
JP1
JP2
JP24
JP24
JP43
C7
IC2
C3
C1
R3
R148
Q45
E
B
R2
R1
I
E
B
Q1
0
ADJ
JP25
JP23
JP26
JP45
JP27
JP8
JP9
JP10
JP11
JP12
JPA
C5
IC1
0
G
I
C12
CNA
CNH
CNE
13
CNC
CR7
9
1
1
1
11
3
JP21
JP19
JP3
1
1
6
1
7
32
33
48
4
9
122
111
JP34
JP38
BZ1
CND
JP33
JP6
R51
JP14
JP15
CF100
CNG
3
JP5
JP7
ZD1
DIP
JP4
JP16
JP17
JP18
JP20
JP22
JP32
JP30
JP41
JP42
JP44
JP28
JP13
D3
RY5
WHT WHT
GRY
D1
D4
VRS1
CR6
CR10
CR9 CR8
2.5A
FUSE1
D2
D8
D7
D9
D6
JP29
JP39
1
1
19
20
D71
D70
2
JP40
JP37
CNB
RY3
RY2
RY1
JP36
JP35
JP31
R96
R97
RY4
BLU
BLU
RED
REDRED
BRN
BRN
BRN
WHT
GRY
RED
GRY
WHT
RY3 RY2 RY1
R5
R4
RY11
RY6
RY7
RY8
C11
RY9
RY5
RY10
RY4
2
4
6
8
10
12
CND
CNB
BLK
RED
BLK
RED
BLK
RED
GRY
RED
BLK
RED
BLU
BLK
BLK
WHT
RED
GRN
BRN
BLU
BLK
WHT
YLW
BLK
WHT
GRY
WHT
GRY
WHT
GRY
1
3
5
7
9
11
BLK
RED
ORG
BRN
BLK
1
2
3
4
5
6
7
8
9
10
11
CNE
GRY
WHT
1
2
3
CN-H
19
17
15
13
11
9
7
5
3
1
to Display Unit (WHA)
RED/BRN
RED/RED
WHT
GRY/WHT
WHT/BLU
WHT
20
18
16
14
12
10
8
6
4
2
RED
RED/RED
WHT/WHT
WHT
from Touch Control Transformer
12
11
10
9
8
7
6
5
4
3
2
1
RED
GRY
BLK
WHT
RED
GRY
BLK
WHT
RED
GRY
BLK
WHT
Control harness
Pin
connector
Control unit CND
Page 42
9 – 2
3. OTHER COMPONENTS
Pump motor
RED
BLU
BLU
N.O
COM.
N.O
N.C
COM.
N.C
COM.
RED
RED
BLU
GRN
321
CN-A
Ground
Door Sensing
Switch
Monitor
Switch
WL joint upper
(Water sensor)
Secondary
Interlock
Switch
INVERTER UNIT
LATCH SWITCHES
NOISE FILTER UNIT
RED
BLK
B
L
K
W
H
T
Y
L
W
GRY
GRY
GRY
WHT
BLU
WHT
RED
WHT
WHT
Main wire harness
Power Supply Cord
GRN
EARTH
BLK
WHT
WHT
RED
Thermal cut-out (Engine)
Humidity sensor harness
Main harness
Pump motor
GRY / BLU
WHT
BLK
Control harness
Purse lock LL
WHT/ WHT
Page 43
9 – 3
Convection motor
Connectors to the antenna motor harness and antenna switch harness
Magnetron
Thermal cut-out (Convection)
RED
WHT
RED
RED
Convection heater
Convection motor
Thermal cut-out (Fan)
RED
RED
WHT
RED/
RED
Control harness
Main harness
Heat cover R assembly
Bottom plate assembly
Page 44
9 – 4
Antenna motor and antenna switch
Purse lock LL and wire holder
BLK for antenna
switch NO. terminal
Antenna motor
RED for antenna
motor terminal
WHT for antenna
motor terminal
BLU for antenna
switch COM. terminal
Wire holder
Purse lock LL
Inverter unit
assembly
Control unit
Bottom plate assembly
Page 45
9 – 5
[2] MAIN CIRCUIT
[3] INVERTER UNIT CIRCUIT
A1
A3
B10
B14
E11E1E3E5 E7
B11B12B13B15 G1G2 G3B20B9B1B2B3B4B5B6B8B7
A1
A3
VRS1
FUSE
A9
A8
A7
A6
H1
H3
RY3
RY4RY2
RY8
RY7
RY6
RY10
CR10
POWER
SAVING
RELAY
CR6 CR7 CR8
RY11
RY1
DOOR
SENSING
SWITCH
THERMISTOR
(OVEN)
THERMISTOR
(ENGINE)
ANTENNA
SWITCH
WATER
SENSOR
FAN M OTOR
PUMP MOTOR
CONVECTION MOTOR
ANTENNA MOTOR
OVEN LAMP
MONITOR SWITCH
MAGNETRON
VENTILATION
FAN
HUMIDITY SENSOR
INVERTER
UNIT
T/C TRANSFORMER
PRIMARY
INTERLOCK
RELAY
CONTROL UNIT
CONVECTION
HEATER
(1350W)
ENGIN HEATER
(900W)
(DC24V) (DC24V)
COOLING
FAN
EXHAUST
FAN
(DC24V
SIROCCO FAN)
FAN MOTOR
THERMAL CUT-OUT
ENGINE
THERMAL
CUT-OUT
CONVECTION
THERMAL CUT-OUT
SECONDARY
INTERLOCK SWITCH
NOISE SUPRESSION COIL
LINE CROSS CAPACITOR 3.3
LINE BYPASS CAPACITOR
10000pF/250V
LINE BYPASS CAPACITOR
10000pF/250V
FUSE
F20A
㧸
㧺
AC 110V
60HZ
NOISE FILTER UNIT
RESISTOR 150k
VRS100
D110
D100
R100
5W/1.8k
ZD100ZD101
10V x2
+
C100
100u/35V
C110
6.8u/200V
L110
VRS110
C111
0.33u/580V
P1
P2
R113
H1
H2
D121
UX-F5B
C121
4800p
3100V
D120
UX-F5B
C120
3000p
2800V
R120
120M(M)
1.3W
PD100
1
2
3
4
F
FA
39K
Q110
CN-A
1/2W
120kG
1/4W 200kG
R110
R114
R115
T110
CT100
1.1kF
1/4W
R101
BLUE
RED
PWM
VS
3
2
1
F
FA
R116
1/2W 47K1/2W 47K
11
9
8
310
21
4
567
A060DR
15A
TH111
60A/900V
J1
1/4W 820
ZD10
5.1V
R10
R117
1/4W 15k
1/2W1.2K
(HIC1)
ZD110
Page 46
9 – 6
[4] CONTROL UNIT CIRCUIT
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Page 47
9 – 7
[5] DISPLAY UNIT CIRCUIT
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㩿㪚㪋㪇㪋㪀
㩿㪩㪋㪇㪈㪀
㩿㪚㪋㪇㪊㪀
㩿㪚㪋㪇㪌㪀
㩿㪩㪋㪇㪉㪀
㩿㪩㪋㪇㪊㪀
㪚㪈㪐㪊
㪌㪇㪭㪆㪇㪅㪈㫌
㪉㪌㪭㪆㪈㫌
㪚㪊㪇㪇
㪚㪊㪇㪈
㩿㪩㪋㪇㪋㪀
-
㪩㪉㪇㪉
㪩㪉㪇㪊
㪣㪛㪉
ᚻേቯ
㪩㪉㪇㪋 㪩㪉㪇㪌
㪣㪛㪊
㒰⩶
㩿㪩㪉㪈㪉㪀
㩿㪚㪉㪇㪇㪀
㩿㪚㪋㪇㪍㪀
㪪㪚㪢㪇㪇
㪪㪦㪇㪇
㪪㪠㪇㪇
㪩㪈㪎㪊
㪩㪈㪎㪋
㪩㪈㪎㪌
㪩㪈㪎㪍
㪩㪈㪎㪏
㪩㪈㪎㪎
㪣㪛㪄
㪭㪛㪛
㪩㪪㪫
㪤㪦㪪㪠
㩿㪩㪋㪇㪌㪀
㩿㪩㪋㪇㪍㪀
㩿㪨㪉㪇㪋㪀
㩿㪩㪉㪈㪊㪀 㩿㪩㪉㪈㪋㪀
㩿㪣㪛㪋㪀
⸃ಓ
46
㩿㪚㪋㪇㪎㪀
㪈㪅㪍㪢㪈㪅㪍㪢
㪈㪅㪍㪢㪈㪅㪍㪢
㪈㪅㪍㪢㪈㪅㪍㪢
㪉㪌㪭㪆㪈㫌
㪍㪅㪊㪭㪆㪉㪅㪉㫌㪍㪅㪊㪭㪆㪉㪅㪉㫌
㪈㪇㪤
㪈㪍㪭㪆㪇㪅㪊㪊㫌
Page 48
PartsGuide
PARTS LIST
WATER OVEN
MODELS
AX-GX2T(R)
AX-GX2T(W)
Parts marked "*" may cause undue microwave exposure.
Parts marked "" are used in voltage more than 250V.
[1]OVEN PARTS
[2]CABINET PARTS
[3]DOOR PARTS
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please
furnish the following information.
CONTENTS
[4]ACCESSORY PARTS AND
PACKING
[5]OTHER PARTS
INDEX
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
Parts marked with "" are important for maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and performance of the set.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
No part of this publication may be reproduced, stored
in retrieval systems, or transmitted in anyform or by
any means, electronic, mechanical, photocopying, recording, or other wise, without prior written permission
of the publisher.
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