CHAPTER 1. BEFORE SERVICING
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 4. PRODUCT DESCRIPTION
CHAPTER 5. OPERATION
CHAPTER 6. TEST PROCEDURE
CHAPTER 7. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 8. MICROWAVE MEASUREMENT
CHAPTER 9. CIRCUIT DIAGRAMS
Parts Guide
No.S3201AXGX2TR_T
WATER OVEN
AX-GX2T(R)
AX-GX2T(W)
SERVICE MANUAL
AXGX2TR
MODELS
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
TopPage
In the interests of user-safety the oven should be restored to its original condition and only parts identical to those
specified should be used.
CONTENTS
CHAPTER 1. BEFORE SERVICING
[1] GENERAL IMPORTANT INFORMA-
TION ........................................................... 1-1
[2] CAUTION MICROWAVE RADIATION ........ 1-1
[3] WARNING................................................... 1-1
CHAPTER 2. WARNING TO SERVICE PERSON-
NEL
[1] Before Servicing.......................................... 2-1
[2] When the testing is completed,................... 2-1
[3] After repairing.............................................. 2-2
[4] Before replacing the Printed Wiring
Board .......................................................... 2-2
CHAPTER 3. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 4. PRODUCT DESCRIPTION
[1] SPECIFICATIONS ...................................... 4-1
[2] OVEN COMPONENTS ILLUSTRATION..... 4-2
CHAPTER 5. OPERATION
[1] Water supply/drainage schematic............... 5-1
[2] Operation of electric parts in each heat-
ing mode ..................................................... 5-3
[3] OFF CONDITION........................................ 5-4
CHAPTER 6. TEST PROCEDURE
[1] MAGNETRON (MG) TEST ......................... 6-1
[2] SECONDARY INTERLOCK SWITCH
AND PRIMARY INTERLOCK SYSTEM
TEST........................................................... 6-2
[3] MONITOR SWITCH TEST.......................... 6-3
[4] FUSE F20A TEST....................................... 6-3
[5] CHECKING TEMPERATURE IN THE
CONVECTION (Oven) MODE .................... 6-4
[6] ERROR LIST .............................................. 6-4
[7] How to check in the event of an error ......... 6-5
[8] Check and remedy in the event of mal-
function ....................................................... 6-9
[9] TEST MODE ............................................. 6-12
CHAPTER 7. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
[1] WARNINGS ................................................ 7-1
[2] OUTER CASE REMOVAL .......................... 7-1
[3] BACK PLATE REMOVAL............................ 7-1
[4] DOOR ASSEMBLY REPLACEMENT ......... 7-2
[5] DOOR COVER REMOVAL AND DOOR
PACKING INSTALLATION .......................... 7-2
[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
[9] BOTTOM PLATE ASSEMBLY REMOV-
AL................................................................ 7-4
[10] ENGINE UNIT REMOVAL........................... 7-4
[11] TUBE PUMP ASSEMBLY REMOVAL......... 7-5
[12] DC FAN MOTOR (Ventilation) REMOV-
AL................................................................ 7-5
[13] CONVECTION UNIT ASSEMBLY............... 7-6
[14] MAGNETRON REPLACEMENT................. 7-6
[15] SIROCCO MOTOR REMOVAL................... 7-7
[16] ANTENNA MOTOR AND ANTENNA
SWITCH REMOVAL...............................
..... 7-7
[17] POWER SUPPLY CORD REPLACE-
MENT.......................................................... 7-7
[18] INVERTER UNIT ASSEMBLY REMOV-
AL................................................................ 7-8
[19] CONTROL UNIT REMOVAL....................... 7-8
[20] DISPLAY UNIT REPLACEMENT................ 7-8
CHAPTER 8. MICROWAVE MEASUREMENT
CHAPTER 9. CIRCUIT DIAGRAMS
[1] PICTORIAL DIAGRAM ............................... 9-1
[2] MAIN CIRCUIT ........................................... 9-5
[3] INVERTER UNIT CIRCUIT......................... 9-5
[4] CONTROL UNIT CIRCUIT ......................... 9-6
[5] DISPLAY UNIT CIRCUIT ............................ 9-7
Parts Guide
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 ser-
vice.
[2] CAUTION MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CON-
DUCTING 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
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
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 har-
ness 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.
PWB CONNECTOR Symptom
CONTROL UNIT CN-A The oven cannot be powered on.
CN-B No heating can be done (even if the door or thermistor has not been opened). No cooling fan runs.
CN-D No indication, no key insertion and no buzzer sound.
CN-E The oven cannot be powered on, no fan motor runs and no oven lamp illuminate.
CN-G No heating can be done. (Humidity sensor error)
3 – 1
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 suf-
fixletter 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 copper Indicates lead-free solder of tin, copper and nickel
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.
ITEM DESCRIPTION
Power Requirements 110 Volts
60 Hertz
Single phase, 3 wire grounded
Power Consumption Microwave 1400W 13.0A
Oven/Grill 1410W 12.8A
Steam 930W 8.4A
Microwave Power Output
*800 W nominal of RF microwave energy ( )
500 W nominal of RF microwave energy (Steady)
Operating frequency 2450 MHz
Convection Heating Element Output 1350W
Engine Heating Elements Output 900W
Outside Dimensions
Width 555mm
Height 440mm
Depth 485mm
Cooking Cavity Dimensions
Width 359mm
Height 256mm
Depth 339mm
Weight Approx. 23kg
Control Complement
• Heating modes
Water oven
Oven
WAter Grill
Grill
Steam
Microwave
• Temperature control ----- 100°C ~ 250°C
• Microwave power --------- 800W, 600W, 500W, 200W
4 – 2
[2] OVEN COMPONENTS ILLUSTRATION
1. OVEN
4 – 3
4 – 4
2. CONTROL PANEL
4 – 5
4 – 6
• If the engine unit is replaced, carry out the treatment after engine unit replacement on page 7-5.This page shows how to operate in
" “(steam cooking) which is used at the treatment .
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4 – 7
• How to carry out " "(citrate washing)
Carry out " "(citrate washing) if the display unit is replaced.
5 – 1
Service Manual
CHAPTER 5. OPERATION
[1] Water supply/drainage schematic
1. When installing the reservoir
2. When Steam, Water Oven and Water Grill operations
FEED-WATER RESERVOIR
Water level sensor
ENGINE UNIT ASSEMBLY
TUBE PUMP
Water level unit
DEW TRAY
Water supply tube
to the engine as-
sembly
Inserting the reservoir delivers water to the water level unit.
Turning the heater ON generates steam.
Dew condensation water in the oven cavity and the exhaust air
duct is discharged to the dew tray
Activation of the
pump delivers
water to the
engine through
the tube.
5 – 2
3. When removing the reservoir
4. When operating the oven in order to discharge remained water in the engine unit assembly and tube (“Drain
water” mode).
Removing the reservoir discharges remained water in the water level unit to the dew tray.
Remained water
in the tube and
the engine is not
discharged even
with the reservoir
removed.
Remained water in the tube is delivered to the engine.
Then the engine heater turn ON so as evaporate
remained water in the engine unit assembly.
Remained water in the water level unit and dew condensation water in the oven cavity
and the exhaust air duct are discharged to the dew tray.
Make sure to
remove the
reservoir.
Remained water
in the tube is
delivered to the
engine unit.
5 – 3
[2] Operation of electric parts in each heating mode
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㪚㫆㫅㫍㪼㪺㫋㫀㫆㫅㩷㪿㪼㪸㫋㪼㫉㩷㩿㪈㪊㪌㪇 㪮㪀
㪜㫅㪾㫀㫅㪼㩷㪿㪼㪸㫋㪼㫉㩷㩿㪐㪇㪇㪮㪀
㪁㪎
㪚㫆㫅㫍㪼㪺㫋㫀㫆㫅㩷㫄㫆㫋㫆㫉 㪁㪌
㪚㫆㫆㫃㫀㫅㪾㩷㪽㪸㫅㩷㫄㫆㫋㫆㫉 㪁㪌
㪭㪼㫅㫋㫀㫃㪸㫋㫀㫆㫅㩷㪽㪸㫅㩷㫄㫆㫋㫆㫉
㪜㫏㪿㪸㫌㫊㫋㩷㪽㪸㫅㩷㫄㫆㫋㫆㫉㩷㩿㫊㫀㫉㫆㪺㪺㫆㪀 㪁㪌
㪧㫌㫄㫇㩷㫄㫆㫋㫆㫉
㪘㫅㫋㪼㫅㫅㪸㩷㫄㫆㫋㫆㫉
㪚㫆㫅㫍㪼㪺㫋㫀㫆㫅㩷㪿㪼㪸㫋㪼㫉㩷㩿㪈㪊㪌㪇 㪮㪀 㪁㪏
㪜㫅㪾㫀㫅㪼㩷㪿㪼㪸㫋㪼㫉㩷㩿㪐㪇㪇㪮㪀 㪁㪍
㪚㫆㫅㫍㪼㪺㫋㫀㫆㫅㩷㫄㫆㫋㫆㫉 㪁㪈
㪚㫆㫆㫃㫀㫅㪾㩷㪽㪸㫅㩷㫄㫆㫋㫆㫉 㪁㪈
㪭㪼㫅㫋㫀㫃㪸㫋㫀㫆㫅㩷㪽㪸㫅㩷㫄㫆㫋㫆㫉
㪜㫏㪿㪸㫌㫊㫋㩷㪽㪸㫅㩷㫄㫆㫋㫆㫉㩷㩿㫊㫀㫉㫆㪺㪺㫆㪀 㪁㪈
㪧㫌㫄㫇㩷㫄㫆㫋㫆㫉
㪘㫅㫋㪼㫅㫅㪸㩷㫄㫆㫋㫆㫉
㪝㪸㫅㩷㫄㫆㫋㫆㫉 㪁㪊
㪤㪸㪾㫅㪼㫋㫉㫆㫅
㪤㪸㪾㫅㪼㫋㫉㫆㫅
㪝㪸㫅㩷㫄㫆㫋㫆㫉
㪤㪸㪾㫅㪼㫋㫉㫆㫅
㪤㪸㪾㫅㪼㫋㫉㫆㫅
㪝㪸㫅㩷㫄㫆㫋㫆㫉 㪁㪊
㪤㪸㪾㫅㪼㫋㫉㫆㫅
㪝㪸㫅㩷㫄㫆㫋㫆㫉 㪁㪊
㪝㪸㫅㩷㫄㫆㫋㫆㫉
㪦 㫍 㪼㫅 㩷㪆 㩷㪞 㫉㫀 㫃㫃
㩿㪧㫉㪼㪿㪼㪸㫋㪀
㪦 㫍㪼 㫅 㩷㩿 㪤㪸 㫀㫅 㩷㪿 㪼 㪸 㫋㫀 㫅 㪾㪀
㪮 㪸㫋 㪼 㫉㩷㪦 㫍㪼 㫅 㩷㪆 㩷㪮 㪸㫋 㪼 㫉㩷㪞 㫉㫀 㫃㫃
㩿㪧㫉㪼㪿㪼㪸㫋㪀
㪮㪸 㫋㪼 㫉 㩷㪦 㫍㪼 㫅 㩷㪆 㩷㪮 㪸㫋㪼 㫉㩷㪞㫉㫀 㫃㫃
㩿㪤㪸㫀㫅㩷㪿㪼㪸㫋㫀㫅㪾㪀
㪞㫉㫀㫃㫃㩷㩿㪤㪸㫀㫅㩷㪿㪼㪸㫋㫀㫅㪾㪀
㪧㫉㪼㫊㪼㫋㩷
㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㩷
㪸㫋㫋㪸㫀㫅㫄㪼㫅㫋㩷
㪈㩷㫄㫀㫅㪅㩷㪹㪼㪽㫆㫉㪼㩷㪼㫅㪻㩷㫆㪽㩷㪺㫆㫆㫂㫀㫅㪾
㪙㪼㪼㫇㩷㫊㫆㫌㫅㪻
㪙㪼㪼㫇㩷㫊㫆㫌㫅㪻
㪝㪸㫅㩷㫄㫆㫋㫆㫉㩷㫎㫀㫃㫃㩷㫊㫋㫆㫇㩷㪽㫆㫉㩷㪌㩷
㫄㫀㫅㪅㩷㪹㫐㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㩷
㪺㫆㫅㫋㫉㫆㫃㪅
㪝㪸㫅㩷㫄㫆㫋㫆㫉㩷㫎㫀㫃㫃㩷㫊㫋㫆㫇㩷㪽㫆㫉㩷
㪌㩷㫄㫀㫅㪅㩷㪹㫐㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㩷㪺㫆㫅㫋㫉㫆㫃㪅
5 – 4
*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.
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
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.
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 magne-
tron 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 discharg-
ing.
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.
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