Sharp R-380LS, R-380LW, R-380L Service Manual

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R380L(W)

SERVICE MANUAL

S1701R380LPJW

MICROWAVE OVEN

HEALTHYMENUS

LOWFAT

VEGETABLES

EXPRESS DEFROST

DEFROST

MEAL

SENSORCOOK

EASY

LESS HELP

EXPRESSMENUS

EXPRESS

QUICK&

VEGETARIAN

MEAL

EXPRESS

COOK

MEAL

RICE/

DESSERTS

PASTA

SENSOR

EASY

REHEAT

MODELS

R-380L(S) R-380L(W)

In the interest 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

CHAPTER 2. WARNING TO SERVICE PERSONNEL

CHAPTER 3. PRODUCT SPECIFICATIONS

CHAPTER 4. APPEARANCE VIEW

CHAPTER 5. OPERATION SEQUENCE

CHAPTER 6. FUNCTION OF IMPORTANT COMPONENTS

CHAPTER 7. TROUBLESHOOTING GUIDE

CHAPTER 8. TEST PROCEDURES

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

CHAPTER 10. PRECAUTIONS FOR USING LEADFREE SOLDER

CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

CHAPTER 12. MICROWAVE MEASUREMENT

CHAPTER 13. CIRCUIT DIAGRAMS

Parts List

This document has been published to be used for after sales service only. The contents are subject to change without notice.

Page 2

CONTENTS

CHAPTER 1. BEFORE SERVICING

CHAPTER 2. WARNING TO SERVICE PERSONNEL

CHAPTER 3. PRODUCT SPECIFICATIONS

CHAPTER 4. APPEARANCE VIEW

CHAPTER 5. OPERATION SEQUENCE

[1] OFF CONDITION........................................ 5-1

[2] MICROWAVE COOKING CONDITION....... 5-1

[3] POWER OUTPUT REDUCTION ................ 5-1

[4] SENSOR COOKING CONDITION.............. 5-1

CHAPTER 6. FUNCTION OF IMPORTANT COMPONENTS

[1] DOOR OPEN MECHANISM ....................... 6-1

[2] 1ST. LATCH SWITCH AND 2ND. IN-

TERLOCK RELAY CONTROL SWITCH..... 6-1

[3] MONITOR SWITCH ................................... 6-1

[4] FUSE F10A................................................. 6-1

[5] HIGH VOLTAGE FUSE .............................. 6-1

[6] OVEN TEMPERATURE FUSE ................... 6-1

[7] TURNTABLE MOTOR................................. 6-1

[8] FAN MOTOR............................................... 6-1

[9] NOISE FILTER............................................ 6-1

CHAPTER 7. TROUBLESHOOTING GUIDE

CHAPTER 8. TEST PROCEDURES

[1] A: MAGNETRON (MG) TEST..................... 8-1

[2] B: POWER TRANSFORMER TEST ........... 8-2

[3] C: HIGH VOLTAGE RECTIFIER TEST....... 8-2

[4] D: HIGH VOLTAGE CAPACITOR TEST..... 8-2

[5] E: SWITCH TEST ....................................... 8-3

[6] F: TEMPERATURE FUSE TEST ................ 8-3

[7] G: MOTOR WINDING TEST....................... 8-3

[8] H: FUSE F10A ............................................ 8-3

[9] I: NOISE FILTER TEST .............................. 8-3

[10] J: HIGH VOLTAGE FUSE TEST ................. 8-4

[11] K: TOUCH CONTROL PANEL ASSEM-

BLY TEST ................................................... 8-4

[12] L: KEY UNIT (MEMBRANE SWITCH)

TEST........................................................... 8-4

[13] M: RELAY TEST ......................................... 8-5

[14] N: PROCEDURES TO BE TAKEN

WHEN THE FOIL PATTERN ON THE

PRINTED WIRING BOARD (PWB) IS

OPEN.......................................................... 8-5

[15] O: AH SENSOR TEST................................ 8-5

[3] SERVICING FOR TOUCH CONTROL

PANEL ........................................................ 9-2

CHAPTER 10. PRECAUTIONS FOR USING LEADFREE SOLDER

CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

[1] BEFORE OPERATING ..............................11-1

[2] OUTER CASE REMOVAL .........................11-1

[3] POWER TRANSFORMER REMOVAL ......11-2

[4] HIGH VOLTAGE RECTIFIER ASSEM-

BLY, HIGH VOLTAGE FUSE AND HIGH

VOLTAGE CAPACITOR REMOVAL...........11-2

[5] MAGNETRON REMOVAL .........................11-2

[6] POSITIVE LOCK CONNECTOR (NO-

CASE TYPE) REMOVAL ...........................11-2

[7] CONTROL PANEL ASSEMBLY RE-

MOVAL.......................................................11-3

[8] GRAPHIC SHEET AND MEMBRANE

SWITCH REPLACEMENT .....................

[9] TURNTABLE MOTOR REMOVAL .............11-3

[10] COOLING FAN MOTOR REMOVAL..........11-3

[11] POWER SUPPLY CORD REPLACE-

MENT.........................................................11-4

[12] 1ST. LATCH SWITCH, 2ND. INTER-

LOCK RELAY CONTROL SWITCH AND

MONITOR SWITCH ADJUSTMENT..........11-4

[13] 1ST. LATCH SWITCH, 2ND. INTER-

LOCK RELAY CONTROL SWITCH AND

MONITOR SWITCH ADJUSTMENT..........11-5

[14] DOOR REPLACEMENT ............................11-5

CHAPTER 12. MICROWAVE MEASUREMENT

CHAPTER 13. CIRCUIT DIAGRAMS

[1] Oven Schematic........................................ 13-1

[2] Pictorial Diagram....................................... 13-2

[3] Power Unit Circuit ..................................... 13-3

[4] CPU Unit Circuit........................................ 13-4

[5] LCD Circuit................................................ 13-5

[6] Printed Wiring Board (Figure S-3)............. 13-6

Parts List

....11-3

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

[1] OUTLINE OF TOUCH CONTROL PAN-

EL ............................................................... 9-1

[2] ABSOLUTE HUMIDITY SENSOR CIR-

CUIT............................................................ 9-1

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CHAPTER 1. BEFORE SERVICING

GENERAL IMPORTANT INFORMATION

This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.

It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.

CAUTION MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

Service engineers should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges and gaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide or antenna while the device is energized.

WARNING

Never operate the oven until the following points are ensured.

(A) The door is tightly closed.

(B) The door brackets and hinges are not defective.

(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-AND-YELLOW --------------EARTH BLUE -----------------------------------NEUTRAL BROWN ---------------------------------------LIVE

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CHAPTER 2. WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage harness and High voltage fuse.

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge the high voltage capacitor.

WARNING: AGAINST THE CHARGE OF THE HIGH-VOLTAGE

CAPACITOR

The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the highvoltage capacitor (that is, of the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.

Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may, in some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D

checks and then disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed, carry out 3D

checks

and reconnect the leads to the primary of the power transformer.

REMEMBER TO CHECK 4R

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. Check all functions.

Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the microwave timer for two (2) minutes. Set the power level to HIGH and push the START button. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out 3D

checks and

reexamine 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.

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CHAPTER 3. PRODUCT SPECIFICATIONS

ITEM DESCRIPTION

Power Requirements

230 - 240 Volts 50 Hertz Single phase, 3 wire earthed

Power Consumption 1.67 k W

Power Output

1200 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz

Case Dimensions

Width 520 mm Height 310 mmincluding foot Depth 440 mm

Turntable Diameter 320 mm

Control Complement

Touch Control System Clock (1:00 - 12:59) Timer (0 - 99 minutes 99 seconds) Microwave Power for Variable Cooking Repetition Rate;

100P ..................................................................... Full power throughout the cooking time

70P ....................................................................... approx. 70% of FULL Power

50P ....................................................................... approx. 50% of FULL Power

30P ...................................................................... approx. 30% of FULL Power

10P ....................................................................... approx. 10% of FULL Power

SENSOR COOK pads SENSOR REHEAT pad HEALTHY MENUS pads EXPRESS MENUS pads EASY DEFROST pad QUICK AND EASY pad NUMBER pads POWER LEVEL pad TIMER/CLOCK pad STOP/CLEAR pad INSTANT COOK/START pad LESS/MORE pads HELP pad

Set Weight (Approx.) 17 kg

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CHAPTER 4. APPEARANCE VIEW

OVEN

1. Door open button

2. Door safety latches

3. Removable turntable support

4. Removable turntable tray

5. Oven lamp

6. See through door

7. Ventilation openings

8. Touch control panel

9. Liquid crystal display

10. Coupling

11. Wave guide cover

12. Power supply cord

13. Door hinges

14. Door seal and sealing surfaces

TOUCH CONTROL PANEL

1. HEALTHY MENUS PADS

Press to select “Healthy Menus” menu.

2. NUMBER PADS

Press to enter cooking times, clock time, weight or quantity of food.

3. TIMER/CLOCK PAD

Press to set Timer and Clock.

4. POWER LEVEL PAD

Press to select microwave power setting. If not pressed, 100% is automatically selected.

5. INSTANT COOK/START PAD

Press once to cook for 1 minute on 100% or increase by 1 minute multiples each time this pad is pressed during manual cooking. Press to start oven after setting programmes.

6. STOP/CLEAR PAD

Press to clear during programming. Press once to stop operation of oven during cooking; press twice to cancel cooking programme.

7. EXPRESS MENUS PADS

Press to select “Express Menus” menus.

8. SENSOR COOK PADS

Press to select Sensor Cook menus.

9. SENSOR REHEAT PAD

Press to select a reheat menu.

10.QUICK AND EASY PAD

Press to select Quick and Easy menus.

11.EASY DEFROST PAD

Press to defrost frozen food by entering quantity.

12.MORE, LESS PADS

Press to increase/decrease the time in one minute increments during cooking or to alter the cooking result for the automatic operations.

13.HELP PAD

Press to select auto start, child lock, demonstration modes or info on pads.

Press to get cooking information.

NOTE: Some one-touch cooking features such as “INSTANT COOK” are disabled after one minute when the oven is not in use. These fea-

tures are automatically enabled when the door is opened and closed or the STOP/CLEAR pad is pressed.

EXPRESS MENUS

DEFROST

EXPRESS

COOK

EXPRESS

MEAL

EXPRESS

LESS HELP

SENSOR COOK

QUICK&

EASY

DEFROST

SENSOR REHEAT

RICE/

PAS TA

DESSERTS

VEGETABLES

HEALTHY MENUS

LOW FAT

MEAL

VEGETARIAN

MEAL

10 11

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CHAPTER 5. OPERATION SEQUENCE

[1] OFF CONDITION

Closing the door activates all door interlock switches (1st. latch switch and 2nd. interlock relay control switch).

MPORTANT

When the oven door is closed, the monitor switch contacts (COM-NC) must be open. When the microwave oven is plugged in a wall outlet, rated voltage is supplied to the noise filter and the control unit.

Figure O-1 on page 13-1

1. The display shows “MICRO-, WAVE, OVEN” repeatedly.

2. To set any programmes or set the clock, you must first touch the

STOP/CLEAR pad.

3. “ : “ appears in the display.

NOTE: When the oven door is opened, the oven lamp comes on at

this time.

[2] MICROWAVE COOKING CONDITION

1. HIGH COOKING

Enter a desired cooking time with the touching NUMBER pad and start the oven with touching START pad.

Function sequence

Figure O-2 on page 13-1

1. Rated voltage is supplied to the primary winding of the power trans-

former. The voltage is converted to about 3.3 volts A.C. output on the filament winding and high voltage of approximately 2000 volts A.C. on the secondary winding.

2. The filament winding voltage (3.3 volts) heats the magnetron fila-

ment and the high voltage (2000 volts) is sent to the voltage doubling circuit, where it is doubled to negative voltage of approximately 4000 volts D.C.

3. The 2450 MHz microwave energy produced in the magnetron gen-

erates a wave length of 12.24 cm. This energy is channelled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.

4. When the cooking time is up, a signal tone is heard and the relays

(RY1+RY2) go back to their home position. The circuits to the oven lamp, power transformer, fan motor and turntable motor are cut off.

5. When the door is opened during a cook cycle, the switches come to

the following condition

The circuits to the power transformer, fan motor and turntable motor are cut off when the 1st. latch switch and 2nd. interlock relay control switch are made open. The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because the relay RY1 stays closed. Shown in the display is the remaining time.

6. MONITOR SWITCH CIRCUIT

The monitor switch is mechanically controlled by oven door, and monitors the operation of the 1st. latch switch and 2nd. interlock relay.

1) When the oven door is opened during or after the cycle of a cooking program, the 1st. latch switch and 2nd. interlock relay control switch must open their contacts first. After that the contacts (COM-NC) of the monitor switch can be closed.

2) When the oven door is closed, the contacts (COM-NC) of the monitor switch must be opened. After that the contacts of the 1st. latch switch and 2nd. interlock relay control switch are closed.

3) When the oven door is opened and the contacts of the 1st. latch switch and 2nd. interlock relay remain closed. The fuse F10A will blow, because the monitor switch is closed and a short circuit is caused.

2. MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING

When the microwave oven is preset for variable cooking power, rated voltage is supplied to the power transformer intermittently within a 32second time base through the relay contact which is coupled with the current-limiting relay. The following levels of microwave power are given.

SETTING;

NOTE: The ON/OFF time ratio does not exactly correspond to the

percentage of microwave power, because approx. 3 seconds are needed for heating up the magnetron filament.

[3] POWER OUTPUT REDUCTION

After 100% power cooking mode is carried out for more than 40 minutes, the power out-put is automatically reduced to 70%.

[4] SENSOR COOKING CONDITION

Using the SENSOR function, the food is cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started. The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI.

An example of how sensor works: (POTATOES)

1. Potatoes at room temperature. Vapor is emitted very slowly.

CONNECTED COMPONENTS RELAY Oven lamp, Fan motor, Turntable motor RY1 Power transformer RY2

CONDITION

SWITCH CONTACT

DURING

COOKING

DOOR OPEN

(NO COOKING) 1st. latch switch COM-NO Closed Open 2nd. interlock relay

control switch

COM-NO Closed Open

Monitor switch COM-NC Open Closed

100P

32 sec. ON

70P

Approx. 70%

100%

24 sec. ON 8 sec. OFF

14 sec. OFF

20 sec. OFF

26 sec. OFF

50P Approx. 50%

18 sec. ON

30P

Approx. 30%

12 sec. ON

10P Approx. 10%

6 sec. ON

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2. Heat potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks.;

3. Sensor detects moisture and humidity and calculates cooking time and variable power.

1. Cooking Sequence.

1. 1.Operate the oven in sensor cooking mode by referring to the operation manual.

NOTE: The oven should not be operated on SENSOR immediately

after plugging in the unit. Wait two minutes before cooking on SENSOR.

2. The coil of shut-off relay (RY-1) is energized, the turntable motor, oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.

3. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor.

NOTE: During this first stage, do not open the door or touch STOP/

CLEAR pad.

4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir, turn, or season food.

5. When the timer reaches zero, an audible signal sounds. The shutoff relay and cook relay are de-energized and the power transformer, oven lamp, etc. are turned off.

6. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display and the oven will revert to an OFF condition.

IC R OWA V E

MIC R OW A V E

AH S ENS OR

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CHAPTER 6. FUNCTION OF IMPORTANT COMPONENTS

[1] DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control panel, refer to the Figure D-1.When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.

Figure D-1. Door Open Mechanism

[2] 1ST. LATCH SWITCH AND 2ND. INTERLOCK RELAY CONTROL SWITCH

1. When the oven door is closed, the contacts (COM-NO) must be closed.

2. When the oven door is opened, the contacts (COM-NO) must be opened.

[3] MONITOR SWITCH

1. When the oven door is closed, the contacts (COM-NC) must be opened.

2. When the oven door is opened, the contacts (COM-NC) must be closed.

3. If the oven door is opened and the contacts (COM-NO) of the 1st. latch switch and 2nd. interlock relay fail too pen, the fuse F10A blows simultaneously with closing the contacts (COM-NC) of the monitor switch.

CAUTION: BEFORE REPLACING A BLOWN FUSE F10ATEST THE

1ST. LATCH SWITCH, 2ND.INTERLOCK RELAY, MONITOR SWITCHAND MONITOR RESISTOR FOR PROPEROPERATION.

[4] FUSE F10A

1. The fuse F10A blows when the contacts (COM-NO) oft he 1st. latch switch and 2nd. interlock relay remain closed with the oven door open and when the monitors witch closes.

2. If the wire harness or electrical components are short-circuited, this fuse F10A blows to prevent an electric shock or fire hazard.

[5] HIGH VOLTAGE FUSE

The high voltage fuse blows when the high voltage rectifier or the magnetron is shorted.

[6] OVEN TEMPERATURE FUSE

The temperature fuse, located on the top of the oven cavity, is designed to prevent damage to the oven by fire.If the food load is overcooked, by either error in cook time or defect in the control unit, the temperature fuse will open.Under normal operation, the temperature fuse remains closed. However, when abnormally high temperatures are reached within the oven cavity, the temperature fuse will open at 150°C, causing the oven to shut down.

[7] TURNTABLE MOTOR

The turntable motor drives the turntable roller assembly to rotate the turntable.

[8] FAN MOTOR

The fan motor drives a blade which draws external cool air.This cool air is directed through the air vents surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cavity.

[9] NOISE FILTER

The noise filter prevents the radio frequency interference that might flow back in the power circuit.

Latch Hook

Monitor Switch

2nd. Interlock Relay Control Switch

1st Latch Switch

Latch Heads

Door

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CHAPTER 7. TROUBLESHOOTING GUIDE

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure”section.

IMPORTANT:

If the oven becomes inoperative because of a blown fuse F10A in the 1st. latch switch - 2nd. interlock relay - monitor switch circuit, check the 1st. latch switch, 2nd.interlock relay and monitor switch before replacing the fuse F10A.

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

1ST. LATCH SWITCH

2ND. INTERLOCK RELAY CONTROL

SWITCH

MONITOR SWITCH

TEMPERATURE FUSE (OVEN)

FAN MOTOR

TURNTABLE MOTOR

FUSE F10A

TOUCH CONTROL PANEL

KEY UNIT

RELAY (RY-1, RY-2)

FOIL PATERN ON P.W.B.

POWER SUPPLY CORD

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

OVEN LAMP

WALL OUTLET

MISADJUSTMENT SWITCH

HOME FUSE OR BREAKER

BLOCKED COOLING FAN

BLOCKED VENTILATION

NOISE FILTER

HIGH VOLTAGE FUSE

AH SENSOR

TEST PROCEDURE

CK = Check / RE = Replace

ABC

EEEFGGHKLMN

RE CK CK RE CK CK CK CK CK

IJO

CONDITION

PROBLEM

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

SENSO RCOOKING CONDITION

CONDITION

OFF CONDITION

Home fuse blows when power supply cord is plugged into wall outlet.

FUSE F10A blows when power supply cord is plugged into wall outlet.

Display does not show anything when power supply cord is plugged into wall outlet.

Display does not operate properly when STOP/CLEAR pad is touched.

Oven lamp does not light at door opened. (Display appears.)

Oven lamp does not light (Display appears.)

Fan motor does not operate. (Display appears.)

Turntable motor assembly does not operate. (Display appears.)

Oven does not start when the START pad is touched. (Display appears)

Oven or any electrical parts does not stop when cooking time is 0 or STOP/CLEAR pad is touched.

Oven goes into cook cycle but shuts down before end of cooking cycle.

Oven stops at 16 sec. after starting.

AH sensor does not end during Sensor cooking condition. (Oven doesnot shut off after a cup of water is boiling by sensor cooking.)

Oven seems to be operating but littleornoheatisproducedin oven load. (Microwave power level is set at 100%)

Oven does not seems to be operating properly when 70%, 50%, 30% or 10% is set. (Oven operates properly a t 100% and then the STOP/CLEAR pad is touched theovenstops.)

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CHAPTER 8. TEST PROCEDURES

[1] A: 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 120 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 ..................................................... 35 sec. Mass of container (mc) ...................................... 330 g

T2 .................................................... Final Temperature T = T2 - T1 P = 120 x T + 0.55 x mc (T2-T0)/35

Room temperature ................................................................... To = 21°C

Initial temperature ..................................................................... T1 = 11°C

Temperature after (35+ 3) = 38 sec. ..................................... T2 = 21°C

Temperature difference Cold-Warm ( T = T2 - T1) .......... T = 10°C

Measured output power

The equation is "P = 120 x T" .................... P = 120 x 10°C = 1200 Watts

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R380L(W)

8 – 2

[2] B: POWER TRANSFORMER TEST

CARRY OUT 3D CHECKS.

Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three windings. The following readings should be obtained:

If the reading obtained are not stated as above, then the power transformer is probably faulty and should be replaced.

CARRY OUT 4R

CHECKS.

[3] C: HIGH VOLTAGE RECTIFIER TEST

CARRY OUT 3D CHECKS.

Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R

CHECKS.

NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE

A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTION.

[4] D: HIGH VOLTAGE CAPACITOR TEST

CARRY OUT 3D CHECKS.

1. Isolate the high voltage capacitor from the circuit.

2. Continuity check must be carried out with measuring instrument which is set to the highest resistance range.

3. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ after it has been charged.

4. A short-circuited capacitor shows continuity all the time.

5. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance.

6. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.

7. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal.

If incorrect reading are obtained, the high voltage capacitor must be replaced.

CARRY OUT 4R

CHECKS.

WARNING: High voltages and large currents are present at the secondary winding and filament winding of the power transformer. It is

very dangerous to work near this part when the oven is on. NEVER make any voltage measurements of the high-voltage circuits, including the magnetron filament.

RTRN-A756WRZZ RTRN-A709WRZZ

Primary winding approx. 1.34Ω approx. 1.25Ω Secondary winding approx. 104.6Ω approx. 101.9Ω Filament winding less than 1Ω

1000g

T1 C

T2 C

Heat up for 38 sec.

HIGH VOLTAGE RECTIFIER

Page 13

R380L(W)

8 – 3

[5] E: SWITCH TEST

CARRY OUT 3D CHECKS.

Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table.

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT 4R

CHECKS.

[6] F: TEMPERATURE FUSE TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the temperature fuse. Then using an ohmmeter, make a continuity test across the two terminals as described in the below.

If incorrect readings are obtained, replace the temperature fuse.

An open circuit temperature fuse (OVEN) indicates that the foods in the oven may catch fire, this maybe due to over heating produced by improper setting of the cooking time or failure of the control panel.

CARRY OUT 4R

CHECKS.

[7] G: MOTOR WINDING TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R

CHECKS.

[8] H: FUSE F10A

CARRY OUT 3D CHECKS.

1. If the fuse F10A is blown, there could be shorts or ground in electrical parts or wire harness.Check them and replace the defective parts or repair the wire harness.

2. If the fuse F10A is blown when the door is opened, check the 1st. latch switch, 2nd. interlock relay and monitor switch.

If the fuse F10A is blown by incorrect door switching replace the defective switch(s) and the fuseF10A.

CARRY OUT 4R

CHECKS.

CAUTION: ONLY REPLACE FUSE F10A WITH THE CORRECT VALUE REPLACEMENT.

[9] I: NOISE FILTER TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the terminals as described in the following table.

If incorrect readings are obtained, replace the noise filter unit.

CARRY OUT 4R

CHECKS.

Table: Terminal Connection of Switch Plunger Operation Common terminal to Normally open terminal Common terminal to Normally close terminal Released Open circuit Short circuit Depressed Short circuit Open circuit.

Table: Temperature Fuse Test

Parts Name

Temperature of “ON” condition

(closed circuit).

Temperature of “OFF” condition

(open circuit).

Indication of ohmmeter (When room temperature is approx. 20°C.)

Temperature fuse 150°C This is not resetable type. Above 150°C Closed circuit

Table: Resistance of Motor

Motors

Fan motor Turntable motor

RMOTEA405WRZZ RMOTEA390WRE0 RMOTDA253WRZZ RMOTDA265WRZZ RMOTDA173WRE0

Resistance Approximately 388Ω Approximately 252Ω Approximately 14.5kΩ Approximately 14.7kΩ Approximately 12.2kΩ

MEASURING POINT INDICATION OF OHMMETER Between N and L Open circuit Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit

RED

WHT

FUSE

F10A

LINE CROSS CAPACITOR

0.068μ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022μ/AC250V

LINE BYPASS CAPACITOR

0.0022μ/AC250V

Page 14

R380L(W)

8 – 4

[10] J: HIGH VOLTAGE FUSE TEST

CARRY OUT 3D CHECKS.

If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.

Check them and replace the defective parts and the high voltage fuse.

CARRY OUT 4R

CHECKS.

CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACEMENT.

[11] K: TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control Unit and Key Unit, and also the Control Unit is divided into two units, CPU Unit and Power Unit, and troubleshooting by unit replacement is described according to the symptoms indicated.

1. Key Unit. Note: Check key unit ribbon connection before replacement.

The following symptoms indicate a defective key unit. Replace the control unit assembly.

1) When touching the pads, a certain pad produces no signal at all.

2) When touching a number pad, two figures or more are displayed.

3) When touching the pads, sometimes a pad produces no signal.

2. Control Unit.

The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure L) to determine if control unit is faulty.

1) In connection with pads.

a) When touching the pads, a certain group of pads do not produce a signal.

b) When touching the pads, no pads produce a signal.

2) In connection with indicators.

a) At a certain digit, all or some segments do not light up.

b) At a certain digit, brightness is low.

c) Only one indicator does not light up.

d) The corresponding segments of all digits do not light up; or they continue to light up.

e) Wrong figure appears.

f) A certain group of indicators do not light up.

g) The figure of all digits flicker.

3) Other possible troubles caused by defective control unit.

a) Buzzer does not sound or continues to sound.

b) Clock does not operate properly.

c) Cooking is not possible.

[12] L: KEY UNIT (MEMBRANE SWITCH) TEST

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the 2nd. interlock relay control switch operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the 2nd. interlock relay control switch is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the 2nd. interlock relay control switch is closed (either close the door or short the 2nd. interlock relay control switch connector). Use the key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact.If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or keypad is at fault.

G1 G2 G3 G4 G5 G6 G7 G8

G10

G11

G12

MORE HELP

65 4

LOW FAT

MEAL

POWER

LEVEL

TIMER

CLOCK

QUICK&

EASY

RICE/PASTA

EXPRESS

COOK

VEGETARIAN

MEAL

INSTANT COOK

START

STOP

CLEAR

SENSOR REHEAT

DESSERTS

EXPRESS

MEAL

LESS

EASY

DEFROST

VEGETABLES

EXPRESS DEFROST

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8 – 5

[13] M: RELAY TEST

CARRY OUT 3D CHECKS.

Remove the outer case and check voltage between the cabinet side terminal of the relay RY1 and the lower side terminal of the relay RY2 on the power unit with an A.C. voltmeter. The meter should indicate 230 - 240 volts, if not check oven circuit.

RY1 and RY2 Relay Test

These relays are operated by D.C. voltage

Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

DC. voltage indicated ................................... Defective relay.

DC. voltage not indicated ............................. Check diode which is connected to the relay coil. If diode is good, control unit is defective.

CARRY OUT 4R

CHECKS.

[14] N: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair.

CARRY OUT 3D

CHECKS.

NOTE: *At the time of making these repairs, make a visual inspection of the varistor.

Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance). If any abnormal condition is detected, replace the control unit.

CARRY OUT 4R

CHECKS.

[15] O: AH SENSOR TEST

Checking the initial sensor cooking condition

WARNING: The oven should be fully assembled before following procedure.

1) The oven should be plugged in at least two minutes before sensor cooking.

2) Room temperature should not exceed 35°C.

3) The unit should not be installed in any area where heat and steam are generated. The unit should not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION Instructions”.

4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.

5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel.

6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be at refrigerator temperature and canned soup at room temperature.

7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The sensor will detect the vapor given of by the spray and turn off before food is properly cooked.

8) After the oven is started on sensor cooking condition, if the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.

Water load cooking test

WARNING: The oven should be fully assembled before following procedure.

Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The cabinet should be installed and screws tightened.

1) Fill approximately 200 milliliters of tap water in a 1000 milliliter measuring cup.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. -24V D.C. Oven lamp / Turntable motor / Cooling fan motor RY2 Approx. -24V D.C. Power transformer

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between the cabinet side terminal of the relay RY1and the lower side terminal of the relay RY2.

Check supply voltage and oven power cord.

2 The rated AC voltage is present to primary side of low voltage transformer.

Low voltage transformer or secondary circuit defective.

Check and replace the control unit. 3 Only pattern at “a” is broken. *Insert jumper wire J1 and solder. 4 Pattern at “a” and “b” are broken. Replace the control unit.

RY1

VRS1

RY3

(J1)

Page 16

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8 – 6

2) Place the container on the center of tray in the oven cavity.

3) Close the door.

4) Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pads 1 once and the number pad 4 once. Now, the oven is in the sensor cooking condition, and “AH20”, “SENSOR” and “COOK” will appear in the display.

5) The oven will operate for the first 16 seconds, without generating microwave energy.

When the AH sensor is defective (open or short), ERROR will appear in the display after 16 seconds cleaning time

.If ERROR appears check sensor wire connections and/or AH sensor.

NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of sensor cooking.

6) After approximately 16 seconds, microwave energy is produced

If ERROR is displayed or the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.

1. TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor.

1) Disconnect the power supply cord, and then remove outer case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Remove the AH sensor.

5) Install the new AH sensor.

6) Reconnect all leads removed from components during testing.

7) Re-install the outer case (cabinet).

8) Reconnect the power supply cord after the outer case is installed.

9) Reconnect the oven to the power supply and check the sensor cook operation as follows:

a) Fill approximately 200 milliliters of tap water in a 1000 milliliter measuring cup.

b) Place the container on the center of tray in the oven cavity.

c) Close the door.

d) Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pads 1 once and the

number pad 4 once.

e) The control panel is in automatic Sensor operation.

f) The oven turns off automatically, and the time for detecting moisture will be displayed.

If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation below.

2. CHECKING CONTROL UNIT

1) Disconnect the power supply cord, and then remove outer case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Disconnect the sensor connector that is mounted to control panel.

5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.

6) Disconnect the leads to the primary of the power transformer.

7) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

8) After that procedure, re-connect the power supply cord.

9) Check the sensor cook operation proceed as follows:

a) Close the door. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pads 1

once and the number pad 4 once.

b) The control panel is in the sensor cooking operation.

c) After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor.

d) After approximately 3 seconds, the display shows “X X. X X “ which is the time for detecting moisture.

If the above is not the case, the control unit is probably defective.

If the above is proper, the AH sensor is probably defective.

10)Disconnect the power supply cord, and then remove outer case.

11)Open the door and block it open.

12)Discharge high voltage capacitor.

13)Disconnect the dummy resistor circuit from the sensor connector of control panel.

14)Carry out necessary repair.

Page 17

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8 – 7

15)Reconnect all leads removed from components during testing and repairing.

16)Re-install the outer case (cabinet).

17)Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.

18)Carry out “Water load cooking test” again and ensure that the oven works properly.

Sensor Dummy Resistor Circuit

Plunger

COM

R3 R4

F-1 F-2

F-3

To connector (F) on Control Unit.

CONNECTOR

Page 18

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9 – 1

R380L(W)

Service Manual

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

[1] OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units.

(1) Key Unit

(2) Control Unit (The Control Unit consists of Power Unit and LSI Unit).

The principal functions of these units and the signals communicated among them are explained below.

1. Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P00-P07.When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P68- P71 to perform the function that was requested.

2. Control Unit

Control unit consists of LSI, reset circuit, indicator circuit, power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and back light circuit.

1) Reset Circuit

This circuit generates a signal which resets the LSI to the initial state when power is supplied.

2) Indicator Circuit

This circuit consists of 25 segments and 4 common electrodes using a Liquid Crystal Display.

3) Power Source Circuit

This circuit generates voltages necessary in the control unit from the AC line voltage.In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit.

4) Relay Circuit

A circuit to drive the magnetron, fan motor, turntable motor and light the oven lamp.

5) Buzzer Circuit

The buzzer is responsive to signals from the LSI to emit audible sounds (key touch sound and completion sound).

6) Synchronizing Signal Circuit

The power source synchronizing signal is available in order to compose a basic standard time in the clockcircuit.It accompanies a very small error because it works on commercial frequency.

7) 2nd. Interlock Relay Control Switch

A switch to “tell” the LSI if the door is open or closed.

8) Back Light Circuit

A circuit to drive the back light (Light emitting diodesLD1- LD4).

9) Absolute Humidity Sensor Circuit

This circuit detects moisture of the cooking food to allow its automatic cooking.

[2] ABSOLUTE HUMIDITY SENSOR CIRCUIT

1. Structure of Absolute Humidity Sensor

The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.

2. Operational Principle of Absolute Humidity Sensor

The figure below shows the basic structure of an absolute humidity sensor. A bridge circuit is formed by two thermistors and two resistors (R1 and R2).The output of the bridge circuit is to be amplified by the operational amplifier.Each thermistor is supplied with a current to keep it heated at about 150°C, the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit, the intensity of which is increased as the absolute humidity of the air increases.Since the output is very minute, it is amplified by the operational amplifier.

Ventilation opening for sensing

Sensing part (Open vessel)

Sensing part (Closed vessel)

Thermistors

Page 19

R380L(W)

9 – 2

3. Detector Circuit of Absolute Humidity Sensor Circuit

This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its AN6 terminal.With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R98 ~ R102. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AN5 terminal of the LSI. The voltage of AN6 terminal will indicate about -2.5V. This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN6 terminal of the LSI.

Then the LSI observes that voltage at AN6 terminal and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit goes in the next operationautomatically.When the LSI starts to detect the initial voltage at AN6 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is not possible to balance the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will appear on the display and the cooking is stopped.

1)Absolute humidity sensor circuit

[3] SERVICING FOR TOUCH CONTROL PANEL

1. Precautions for Handling Electronic Components

This unit uses CMOS LSI in the integral part of the circuits.When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc. and sometimes it is not fully protected by the built-in protection circuit.

In order to protect CMOS LSI.

1) When storing and transporting, thoroughly wrap them in aluminium foil. Also wrap all PW boards containing them in aluminium foil.

2) When soldering, ground the technician as shown in the figure and use grounded soldering iron and work table.

2. Servicing of Touch Control Panel

We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so. To perform the servicing, power to the touch control panel is available either from the power line of the oven itself or from an external power source.

1. Servicing the touch control panel with power supply of the oven:

Operational amplifie r

Output voltage

S:Thermistor

open vessel

C:Thermistor

closed vessel

Ab s o lu te h um idity ( g /m )

tvoltage

Ab s o lu te h um idity v s , output voltage cha rac teris tic

SW1

SW2

SW3

SW4

SW5

P40

P41

P42

P43

P44

LSI

(IC1)

AN5

AN6

620k

300k

150k

75k

37.4k

15k

4.7k

1234

8765

0.01uF

0.015uF

0.01

VA : -15V

R90

C90

C91

C93

C92

F-2

1.8k

IC2

F-1

F-3

3.57k

3.32k

VC : -5V

0.1

C. Thermistor in

closed vessel

S. Thermistor in

open vessel

R98

R99

R96

R91

360k

R93

R92

R94

R95

D90

R100

R101

R102

R97

appro x. 1M ohm

Page 20

R380L(W)

9 – 3

CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZ-

ARD.

Therefore, before checking the performance of the touch control panel,

1) Disconnect the power supply cord, and then remove outer case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Disconnect the leads to the primary of the power transformer.

5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

6) After that procedure, re-connect the power supply cord.

After checking the performance of the touch control panel,

1) 1)Disconnect the power supply cord.

2) Open the door and block it open.

3) Re-connect the leads to the primary of the power transformer.

4) Re-install the outer case (cabinet).

5) Re-connect the power supply cord after the outer case is installed.

6) Run the oven and check all functions.

a) On some models, the power supply cord between the touch control panel and the oven itself is so short that the two can’t be separated. For

those models, check and repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the oven.

b) On some models, the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from

each other. For those models, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which activates an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

2. Servicing the touch control panel with power supply from an external power source:

Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which activates an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s).

3. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 60W

(It is recommended to use a soldering iron with a grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC - 10MHz type or more advanced model.

3) Others: Hand tools

4. Other Precautions

1) Before turning on the power source of the control unit, remove the aluminium foil applied for preventing static electricity.

2) Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

3) After aluminium foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.

5) Be sure to use specified components where high precision is required.

Page 21

R380L(W)

10 – 1

R380L(W)

Service Manual

CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. 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 suffix letter indicates the alloy type of the solder.

Example:

2. 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.

3. Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) 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

Page 22

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11 – 1

R380L(W)

Service Manual

CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCE-

DURE

[1] BEFORE OPERATING

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock.

(Example)

High Voltage Capacitor, power transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage fuse, High Voltage Harness etc.

WARNING:

Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven.

1) Disconnect the power supply cord.

2) Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click” as the door switches operate.)

3) Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).

Carry out any remedial work that is necessary before operating the oven.

Do not operate the oven if any of the following conditions exist;

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.

Please refer to ”OVEN PARTS, CABINET PARTS, DOOR PARTS”, when carrying out any of the following removal procedures:

To prevent an electric shock, take the following precautions.

1. Before wiring,

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) Discharge the high voltage capacitor and wait for 60 seconds.

2. Don't let the wire leads touch to the following parts;

1) High voltage parts:

Magnetron, Power transformer, High voltage capacitor, High voltage rectifier assembly and High voltage fuse.

2) Hot parts:

Convection heater, Oven lamp, Magnetron, High voltage transformer and Oven cavity.

3) Sharp edge:

Bottom plate, Oven cavity, Weveguide flange, Chassis support and other metallic plate.

4) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch, Switch lever, Open button.

3. Do not catch the wire leads in the outer case cabinet.

4. Insert the positive lock connector certainly until its pin is locked. And make sure that the wire leads should not come off even if the wire leads is pulled.

5. To prevent an error function, connect the wire leads correctly, referring to the Pictorial Diagram.

[2] OUTER CASE REMOVAL

To remove the outer case, procedure as follows.

1. Disconnect the oven from power supply.

2. Open the oven door and wedge it open.

3. Remove five (5) screws from rear and one (1) screw along the right side edge of case.

4. Slide the entire case back out about 1 inch (3 cm) to free it from retaining clips on the cavity face plate.

5. Lift entire case from the unit.

6. Discharge the H. V. capacitor before carrying out any further work.

7. Do not operate the oven with the outer case removed.

NOTE: Step 1, 2 and 6 form the basis of the 3D

checks.

CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE

TOUCHING ANY OVEN COMPONENTS OR WIRING.

WARNING AGAINST HIGH VOLTAGE:

WARNING FOR WIRING

REMEMBER TO CHECK 3D

1) Disconnect the supply. 3)Discharge high voltage capacitor.

2)Door opened, and wedged open.

Page 23

R380L(W)

11 – 2

[3] POWER TRANSFORMER REMOVAL

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads (primary) from the power transformer.

3. Disconnect the high voltage fuse from the power transformer.

4. Disconnect the filament leads from the magnetron and the high voltage capacitor.

5. Remove four (4) screws (two (2) screws from the upper side and two (2) screws from bottom side) holding transformer to bottom plate.

6. Remove transformer from bottom plate.

2. RE-INSTALL

1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate.

2. Secure transformer with four (4) screws (two (2) screws from the upper side and two (2) screws from bottom side) to bottom plate.

3. Reconnect wire leads (primary) to power transformer and filament leads of transformer to magnetron and high voltage capacitor. And reconnect the high voltage fuse to the power transformer. Refer to “PICTORIALDIAGRAM”.

4. Reinstall outer case and check that oven is operating properly.

[4] HIGH VOLTAGE RECTIFIER ASSEMBLY, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the high voltage fuse from the power transformer.

3. Disconnect the high voltage wire of high voltage rectifier assembly from the magnetron.

4. Disconnect the filament lead (short one) of the power transformer from the high voltage capacitor.

5. Remove the one (1) screw holding capacitor holder to bottom plate.

6. Remove one (1) screw holding high voltage rectifier assembly to capacitor holder.

7. Disconnect rectifier terminal from capacitor.

High voltage rectifier assembly is now free.

8. Disconnect the high voltage fuse from the capacitor.

The high voltage fuse is now free.

9. Remove capacitor holder. Capacitor is now free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC-TIFIER AND

HIGH VOLTAGE CAPACITOR,GROUND SIDE TERMINAL OF THE HIGHVOLTAGE RECTIFIER MUST BE SECUREDFIRMLY WITH A GROUNDING SCREW.

[5] MAGNETRON REMOVAL

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect all wire leads from magnetron.

3. Remove the one (1) screw holding the chassis support to the magnetron.

4. Release the chassis support from the hole of the oven cavity front flange.

5. Remove the two (2) screws holding air duct to magnetron and oven cavity top plate.

6. Remove the air duct from oven.

7. Carefully remove the four (4) screws holding magnetron to waveguide flange.

8. Remove magnetron with care so that magnetron antenna is not hit by any metal object around antenna.

9. Now, the magnetron is free.

2. REINSTALLATION

1. Reinstall the magnetron to waveguide flange with the four (4) screws.

2. Reinstall the air duct to the oven cavity top plate and the magnetron with two (2) screws.

3. Insert the end of the chassis support into the hole of the oven cavity front flange.

4. Hold the other end of the chassis support to the magnetron with the one (1) screw.

5. Reconnect the wire leads to the magnetron. Refer to ”PICTORIAL DIAGRAM”.

6. Reinstall outer case and check that the oven is operating properly.

CAUTION: WHEN REPLACING MAGNETRON, BESURE THE R.F.

GASKET IS IN PLACE ANDMOUNTING SCREWS ARE TIGHTENEDSECURELY.

[6] POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL

1. CARRY OUT 3D CHECKS.

2. Push the lever of positive lock® connector.

3. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNEC-

TORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU.

Figure C-1. Positive lock, connector

Terminal

Push

Pull down

Lever

Positive lock¨ connector

Page 24

R380L(W)

11 – 3

[7] CONTROL PANEL ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the leads from the control unit.

3. Remove the one (1) screw holding the control panel assembly to the oven flange.

4. Slide the control panel assembly upward and remove it.

5. Now, individual components can be removed.

[8] GRAPHIC SHEET AND MEMBRANE SWITCH REPLACEMENT

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the control panel assembly, referring to chapter of CONTROL PANEL ASSEMBLY REMOVAL.

3. Remove the four (4) screws holding the control unit to the control panel frame. And remove the control unit.

4. Tear away the graphic sheet from the control panel frame.

5. Tear away the membrane switch from the control panel frame.

2. REINSTALL

1. Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol.

2. Tear the backing paper from the new membrane switch.

3. Insert the ribbon cable of the membrane switch into the slit of the control panel frame.

4. Adjust the upper edge and right edge of the membrane switch to the small depression on the surface of the control panel frame.

5. Attach the membrane switch to the control panel frame by rubbing with a soft cloth not to scratch.

6. Tear the backing paper from the new graphic sheet.

7. Adjust the upper edge and right edge of the graphic sheet to the large depression on the surface of the control panel frame.

8. Attach the graphic sheet to the control panel frame by rubbing with a soft cloth not to scratch.

9. Insert the ribbon cable into the slit of the control unit.

10.Reinstall the control unit to the control panel frame with four (4) screws.

11.Connect membrane switch’s ribbon cable to the connector CN-G of the control unit.

Figure C-2.Graphic Sheet and Membrane Switch Replacement

[9] TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Remove turntable and turntable support from oven cavity.

3. Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four corners.

4. Where the corners have been snipped off bend corner areas flat. No sharp edges must be evident after removal of the turntable motor cover.

5. Disconnect wire leads from turntable motor.

(See “Positive lock connector removal”)

6. Remove one (1) screw holding turntable motor to oven cavity.

7. Now the turntable motor is free.

8. After replacement use the one (1) screw (XHPS740P08K00) to fit the turntable motor cover.

[10] COOLING FAN MOTOR REMOVAL

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the fan motor.

3. Remove the two (2) screws holding the fan motor to the oven cavity back plate.

4. Remove the fan blade from the fan motor shaft according to the following procedure.

5. Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.

CAUTION: • Make sure that no metal pieces enter the gap between

the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced.

• Do not touch the pliers to the coil of the fan motor because the coil may be cut or injured.

• Do not disfigure the bracket by touching with the pliers.

6. Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand.

7. Now, the fan blade will be free.

CAUTION: Do not reuse the removed fan blade because the hole (for

shaft) may be larger than normal.

8. Now, the fan motor is free.

2. INSTALLATION

1. Install the fan blade to the fan motor shaft according to the following procedure.

Small depression

Large depression

Membrane switch

Control panel frame

Graphic sheet

Page 25

R380L(W)

11 – 4

2. Hold the center of the bracket which supports the shaft of the fan motor on the flat table.

3. Apply the screw lock tight into the hole (for shaft) of the fan blade.

4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet.

5. Install the fan motor assembly to the oven cavity back plate with two (2) screws.

CAUTION: • Do not hit the fan blade strongly when installed because

the bracket may be disfigured.

• Make sure that the fan blade rotates smooth afterinstallation.

• Make sure that the axis of the shaft is not slanted.

6. Connect the wire leads to the magnetron and fan motor, referring to the pictorial diagram.

[11] POWER SUPPLY CORD REPLACEMENT

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the single (1) screw holding the green/yellow wire to the oven cavity back plate.

3. Disconnect the leads of the power supply cord from the noise filter, referring to the Figure C-3(a).

4. Release the moulding cord stopper of the power supply cord from the square hole of the oven cavity back plate, referring to the Figure C-3(b).

5. Now, the power supply cord is free.

Figure C-3(a) Power Supply Cord Replacement

2. REINSTALL

1. Insert the moulding cord stopper of power supply cord into the square hole of the rear cabinet, referring to the Figure C-3 (b).

2. Install the earth wire lead of power supply cord to the oven cavity back plate with one (1) screw and tight the screw.

3. Connect the brown and blue wire leads of power supply cord to the noise filter correctly, referring to the Pictorial Diagram.

4. Re-install outer case and check that the oven is operating properly.

Figure C-3(b) Power Supply Cord Replacement

[12] 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from the switches.

3. Remove two (2) screws holding latch hook to oven flange.

4. Remove latch hook assembly from oven flange.

5. Push outward on the two (2) retaining tabs holding switch in place.

6. Switch is now free. At this time switch lever will be free, do not lose it.

2. REINSTALL

1. Reinstall each switch in its place. The 1st. latch and monitor switches are in the lower position and the2nd. interlock relay control switch is in the upper position.

2. Reconnect wire leads to each switch. Refer to pictorial diagram.

3. Secure latch hook (with two (2) mounting screws) to oven flange.

4. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit. Refer to chapter “Test Procedure” and Adjustment procedure.

Gap

Rotor

Bracket

Stator

Groove joint pliers

Coil

Shaft

Axis

Stator

Rotor

These are the positions that should be pinched with pliers.

Shaft

Table

Center of bracket

Rear View

Side View

Power Supply Cord

Oven Cavity Back Plate

Screw

Green/Yellow Wire

Brown Wire

Blue Wire

Noise Filter

WHT

RED

Power Supply Cord

Oven Cavity Back Plate

Square Hole

Moulding Cord Stopper

Page 26

R380L(W)

11 – 5

[13] 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT

1. Adjustment

If the 1st. latch switch, 2nd. interlock relay control switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

1. Loosen the two (2) screws holding latch hook to the oven cavity front flange.

2. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the 1st.latch switch and 2nd. interlock relay control switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.

3. Secure the screws with washers firmly.

4. Check all switches operation. If each switch has not activated with the door closed, loosen screw and adjust the latch hook position.

2. After adjustment, check the following.

1. n and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm.

2. The 1st. latch switch and 2nd. interlock relay controls witch interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. Reinstall outer case and check for microwave leakage around door with an approved microwave survey meter.(Refer to Microwave Measurement Procedure.)

Figure C-4. Latch Switch Adjustments

[14] DOOR REPLACEMENT

1. REMOVAL

1. Disconnect the power supply cord.

2. Open the door slightly.

3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-5 to free engaging parts.

4. Pry the choke cover by inserting a putty knife as shown Figure C-5.

5. Release choke cover from door panel.

6. Now choke cover is free.

NOTE: When carrying out any repair to the door, do not bend or

warp the slit choke (tabs on the door panel assembly) to prevent microwave leakage.

Figure C-5. Door Disassembly

7. Release two (2) pins of door panel from two (2) holes of upper and lower oven hinges by lifting up.

8. Now, door panel with door frame is free from oven cavity.

9. Release door panel from ten (10) tabs of door frame.

10.Now, door panel with sealer film is free.

11.Tear sealer film from door panel.

12.Now, door panel is free.

13.Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.

14.Now, latch head and latch spring are free.

15.Remove door screen from door frame.

16.Now, door screen is free.

2. REINSTALL

1. Re-install door screen to door frame.

2. Reinstall the latch spring to the latch head. Reinstall the latch spring to the door frame. Reinstall latch head to door frame.

3. Reinstall door panel to door frame by fitting ten (10)tabs of door frame to ten (10) holes of door panel.

4. Put sealer film on door panel. Refer to “Sealer Film” about how to handle new one.

5. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges.

6. Re-install choke cover to door panel by pushing.

NOTE: After any service to the door;

1) Make sure that 1st. latch switch, 2nd. interlock relay control switch and monitor switch are operating properly. (Refer to chapter “Test Procedures”.).

2) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.

Latch Hook

Monitor Switch

2nd. Interlock Relay Control Switch

1st Latch Switch

Latch Heads

Door

Choke Cover

Door Frame

Putty Knife

Page 27

R380L(W)

11 – 6

3. After any service, make sure of the following:

1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole.

2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm.

3. Door is positioned with its face pressed toward cavity face plate.

4. Check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

NOTE: The door on a microwave oven is designed to act as an

electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be air-tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from oven cavity.

Figure C-7. Door Replacement

4. SEALER FILM

1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-7

2. Tear the backing film by pulling the adhesive tape.

3. Put the pasted side of the sealer film on the door panel

Figure C-7. Sealer film

Upper Oven Hinge

Lower Oven

Hinge

Lower Oven Hinge

Slit choke of door panel

Choke Cover

Sealer film

Backing film

Adhesive tape

Page 28

R380L(W)

12 – 1

R380L(W)

Service Manual

CHAPTER 12. 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

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

Page 29

R380L(W)

13 – 1

R380L(W)

Service Manual

CHAPTER 13. CIRCUIT DIAGRAMS

[1] Oven Schematic

Figure O-1 Oven Schematic-OFF Condition

Figure O-2 Oven Schematic-ON Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START KEY TOUCHED.

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

H. V. FUSE

0.8A

CAPACITOR

1.13μ AC2300V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. LATCH SWITCH

2ND. INTERLOCK RELAY

MONITOR SWITCH

CONTROL UNIT

TTM

TEMPERATURE FUSE 150ºC (OVEN)

RY-2

RY-1

NOISE FILTER

EARTH

BLU

BRN

NEUTRAL

LIVE

G-Y

FUSE F10A

LINE CROSS CAPACITOR

0.068μ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022μ/AC250V

LINE BYPASS CAPACITOR

0.0022μ/AC250V

AH SENSOR

F-3

F-2

F-1

230-240V 50Hz

AH SENSOR

F-3

F-2

F-1

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

H. V. FUSE

0.8A

CAPACITOR

1.13μ AC2300V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. LATCH SWITCH

2ND. INTERLOCK RELAY

MONITOR SWITCH

CONTROL UNIT

TTM

TEMPERATURE FUSE 150ºC (OVEN)

RY-2

RY-1

NOISE FILTER

EARTH

BLU

BRN

230-240V 50Hz

NEUTRAL

LIVE

G-Y

FUSE F10A

LINE CROSS CAPACITOR

0.068μ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022μ/AC250V

LINE BYPASS CAPACITOR

0.0022μ/AC250V

Page 30

R380L(W)

13 – 2

[2] Pictorial Diagram

Figure S-1. Pictorial Diagram

HIGH VOLTAGE

CAPACITOR

H.V. RECTIFIER

HIGH VOLTAGE COMPONENTS

MAGNETRON

FERRITE

CORE

COM.

MONITOR

SWITCH

COM.

N.O.

N.C.

2ND. INTERLOCK

RELAY CONTROL

SWITCH

TURNTABLE

MOTOR

POWER

TRANSFORMER

WHT

GRY

EARTH

NEUTRAL

LIVE

RED

GRY

BLK

GRY

GRN

GRY

GRN

BLK

GRY

BLU

PNK

GRY

FAN MOTOR

OVEN CAVITY

BACK PLATE

POWER SUPPLY CORD

TEMPERATURE

FUSE (OVEN)

RED

GRY

1ST. LATCH

SWITCH

COM.

GRY

WHT

RED

BRN

WHT

RED

CN-B

BLK

CN-A

OVEN

LAMP

RED

PNK

RED

PNK

GRN

HIGH VOLTAGE FUSE

NOISE FILTER

WHT

RED

G/Y

PNK

BLK

RED

GRY

WHT

RY2

RY1

SP1

IC1

2ND.

INTERLOCK

RELAY

CN-A

CN-B

CN-G

CN-C

N.O.

COM.

CONTROL UNIT

(CPU UNIT)

(POWER UNIT)

(Lower)

(Upper)

(Oven side)

(Cabinet side)

RED

CN-F

BLK

AH SENSOR

RED

WHT

123

CN-F

Page 31

R380L(W)

13 – 3

[3] Power Unit Circuit

Figure S-2(a). Power Unit Circuit

CN-A

TTM

MICRO

VRS1

10G471K

PA112DR

1N4002 x 4

D1 - D4

RY1

0.1uF/50V

1000uF/35V

10uF/35V

ZD1

HZ16-1

2.4K

(R9)

(J1)

(D10)

SP1

CN-C

GND

INT

BUZZER

OL,FM,

TTM

MICRO

2ND. INTERLOCK RELAY CONTROL SWITCH

OMIF-S-124LM

DU24D1-1P(M)-R

2SB1238

680 1/2W

510 1/2W

R6 3.3K

D5 D6

2SB1238

C10

4.7K

DTD143ES

C11

Hz Free

LED

B02B-XASK-1

CN-B

B2P-VH-B

:IFNOTSPECIFIED1/4W±5%

:IFNOTSPECIFIED1SS133 or 1SS270A

:IFNOTSPECIFIED0.1uF/50V

(CN-D)

NOTE:

C12

Page 32

R380L(W)

13 – 4

[4] CPU Unit Circuit

Figure S-2(b). CPU Unit Circuit

Figure S-2(c)

Page 33

R380L(W)

13 – 5

[5] LCD Circuit

Figure S-2(c). LCD Circuit

VDD

OSC4

OSC3

VD1

OSC2

OSC1

VSS

COM0

COM1

COM2

COM3

COM4

COM5

COM6

COM7

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

VC1

VC2

VC3

VC4

VC5

COM8

COM9

COM10

COM11

COM12

COM13

COM14

COM15

COM16

SEG39

SEG38

SEG37

SEG36

SEG22

SEG21

SEG20

SEG19

SEG18

SEG17

SEG16

SEG15

Page 34

R380L(W)

13 – 6

[6] Printed Wiring Board (Figure S-3)

Figure S-3. Printed Wiring Board of Power Unit

DIP

SP1

RY2

RY1

VRS1

RY3

(D20)

(J2)

(J1)

(D10)

(R9)

ZD1

CN-C

CN - A

(CN - B)

(CN-D)

SH-B SH-A

(RED) (GREEN)

Sn-Ag-Cu

Page 35

PARTS LIST

HOW TO ORDER REPLACEMENT PARTS

To have your order filled promptly and correctly, please furnish the following information.

1. MODEL NUMBER

2. REF. NO.

3. PART NO.

4. DESCRIPTION

Parts marked "*" may cause undue microwave exposure. Parts marked " " are used in voltage more than 250V.

MODELS

CONTENTS

R380L(W)

MICROWAVE OVEN

R-380L(S) R-380L(W)

PartsGuide

[1] OVEN PARTS

INTO THE OVEN CAVITY

DOOR PROTECTION SHEET

SPADPA204WRE0

6-6 INSTRUCTION BOOK

6-2 TURNTABLE TRAY

6-1 TURNRTABLE SUPPORT

[2] DOOR AND CONTROL PANEL

PARTS

 INDEX

TOP PAD ASSEMBLY

FPADBA663WRKZ

PLASTIC BAG

SSAKHA034WRE0

BOTTOM PAD ASSEMBLY

FPADBA664WRKZ

Not replaceable items.

TRAY PAD ASSY

(CPADBA317WRKZ)

PACKING CASE

SPAKCE479WREZ [R380L(W)] SPAKCE482WREZ [R380L(S)]

This document has been published to be used for after sales service only. The contents are subject to change without notice.

Page 36

R380L(W)

[1] OVEN PARTS

7-10

7-2

7-10

7-6

1-15

6-3

4-13

4-4

4-20

4-17

1-7

2-1

4-12

4-9

4-3

7-11

7-8

7-3

1-13

7-1

1-12

4-15

1-6

7-8

4-16

7-1

7-8

1-3

7-10

4-19

7-3

7-10

7-2

7-10

7-9

6-4

7-10

1-8

7-7

4-8

4-7

7-2

6-1

6-2

2-3

6-5

4-12

7-2

1-9

7-1

2-2

2-3

7-2

2-3

4-10

1-10

7-1

7-4

7-1

4-21

4-11

4-14

7-5

4-18

7-8

1-4

4-2

1-5

4-5

2-3

4-6

1-11

7-7

4-1

1-1

1-2

1-1

1-14

4-12

7-5

Page 37

R380L(W)

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PAR T

RANK

[1] OVEN PARTS

ELECTRIC PARTS

1-1 QSW-MA085WRE0 AF 1st. latch / 2nd. interlock relay control switch 1-1 QSW-MA147WRZZ AG 1st. latch / 2nd. interlock relay control switch (Interchangeable) 1-1 QSW-MA137WRE0 AH 1st. latch / 2nd. interlock relay control switch (Interchangeable) 1-2 QSW-MA086WRE0 AF Monitor switch 1-2 QSW-MA148WRZZ AF Monitor switch (Intercangeable) 1-2 QSW-MA138WRE0 AH Monitor switch (Intercangeable) 1-3 QACC-A142WRZZ AQ Power supply cord 1-3 QACC-A139WRZZ -- Power supply cord for production (Intercahngeable) 1-3 QACC-A156WRZZ -- Power supply cord for production (Intercahngeable)

* 4-1 PHOK-A131WRFZ AL Latch hook

* 4-4 FOVN-A536WRTZ BF Oven cavity

1-4 FH-DZA111WRKZ AU High voltage rectifier assembly 1-4 FH-DZA127WRKZ -- High voltage rectifier assembly for production (Interchangeable) 1-5 RC-QZA273WRZZ AU High voltage capacitor 1-5 RC-QZA293WRZZ AV High voltage capacitor (Interchangeable) 1-5 RC-QZA338WRZZ -- High voltage capacitor for production (Interchangeable) 1-6 RMOTEA405WRZZ AX Fan motor 1-6 RMOTEA390WRE0 AW Fan motor (Interchangeable) 1-7 QFS-TA014WRE0 AG Temperature fuse 150deg.C (oven) 1-8 RLMPTA088WRZZ AN Oven lamp 1-8 RLMPTA083WRZZ AM Oven lamp (Interchangeable) 1-9 RMOTDA253WRZZ AV Turntable motor 1-9 RMOTDA265WRZZ AS Turntable motor (Interchangeable) 1-9 RMOTDA173WRE0 AX Turntable motor (Interchangeable)

1-9 RMOTDA230WRE0 AS Turntable motor (Interchangeable) 1-10 RTRN-A756WRZZ BR Power transformer 1-10 RTRN-A709WRZZ BM Power transformer (Interchangeable)

1-11 RV-MZA295WRE0 BF Magnetron

1-12 FPWBFA426WRKZ AU Noise filter 1-13 QFS-CA026WRZZ AH Fuse F10A 1-14 QFS-IA011WRZZ AQ High voltage fuse 0.80A 1-15 FDTCTA230WRKZ AX AH sensor assembly

CABINET PARTS

2-1 GCABUA883WRPZ BF Outer case cabinet [R-380L(W)]

2-1 GCABUA935WRPZ BD Outer case cabinet [R-380L(S)]

2-2 FDAI-A269WRYZ AW Bottom plate

2-3 GLEGPA074WRE0 AC Foot

OVEN PARTS

4-2 LBNDKA172WRPZ AM Capacitor holder

4-3 NFANJA053WRFZ AG Fan blade

4-5 MLEVPA233WRF0 AG Switch lever

4-6 GCOVHA470WRFZ AG Cover

4-7 PCOVPA394WREZ AK Waveguide cover

4-8 PDUC-A833WRPZ AM Air duct

4-9 PDUC-A854WRPZ AL Fan duct 4-10 PPACGA176WREZ AC TTM packing 4-11 PCUSGA693WRPZ AF Cushion 4-12 PCUSUA278WRP0 AB Cushion 4-13 PDUC-A842WRPZ AP Sensor duct 4-14 PCUSGA614WRPZ AE Cushion 4-15 PCUSGA615WRPZ AE Cushion 4-16 MROD-A019WREZ AN Chassis support 4-17 PCUSUA212WRP0 AB Cushion 4-18 PCUSGA620WRPZ AF Cushion 4-19 PSPAJA007WRFZ AF Spacer 4-20 PCUSGA388WRP0 AK Cushion 4-21 PCUSGA707WRPZ AC Cushion

MISCELLANEOUS

6-1 FROLPA101WRKZ AR Turntable support

6-2 NTNT-A117WREZ AS Turntable

6-3 TCAUHA343WRRZ AF Micro caution

6-4 TCAUHA214WRR0 AC K caution label

6-5 TLABMB142WRRZ AK Menu label

SCREWS

7-1 XHPS740P08K00 AB Screw : 4mm x 8mm

7-2 XOTS740P12RV0 AA Screw : 4mm x 12mm

7-3 LX-CZA073WRE0 AC Special screw

7-4 LX-CZ0052WRE0 AA Special screw

7-5 XOTS740P12000 AA Screw : 4mm x 12mm

7-6 XHPS730P06000 AB Screw : 3mm x 6mm

7-7 XHPS740P08000 AB Screw : 4mm x 8mm

7-8 XHTS740P08RV0 AG Screw : 4mm x 8mm

7-9 XHTS740P08000 AC Screw : 4mm x 8mm 7-10 XOTS740P08000 AA Screw : 4mm x 8mm 7-11 XETS740P10000 AA Screw : 4mm x 10mm

DESCRIPTION

Page 38

R380L(W)

[2] DOOR AND CONTROL PANEL PARTS

5-1

5-3

5-7

5-2

5-4

3-2-1

3-2

5-6

5-5

3-1

3-5

6-6

6-7

3-4

3-3

3-2-2

6-8

Page 39

R380L(W)

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PAR T

RANK

[2] DOOR AND CONTROL PANEL PARTS

CONTROL PANEL PARTS

3-1 DPWB-A462DRKZ BR Control unit

3-2 FPNLCB933WRKZ BA Panel sub assembly [R-380L(W)]

3-2 FPNLCB936WRKZ BB Panel sub assembly [R-380L(S)]

3-2-1 PSHEPB233WREZ AP Graphic sheet [R-380L(W)] 3-2-1 PSHEPB236WREZ AP Graphic sheet [R-380L(S)] 3-2-2 QSW-KA075DRZZ AQ Membrane switch

3-3 JBTN-B384WRFZ AG Open button [R-380L(W)]

3-3 JBTN-B385WRTZ AM Open button [R-380L(S)]

3-4 MSPRCA050WRE0 AB Button spring

3-5 XEPS730P08XS0 AB Screw : 3mm x 8mm

DOOR PARTS

* 5-1 FDORFA403WRTZ BF Door panel

* 5-3 GWAKPB075WRFZ AU Door frame [R-380L(W)] * 5-3 GWAKPB076WRTZ BA Door frame [R-380L(S)]

* 5-5 LSTPPA188WRF0 AG Latch head

* 5-7 GCOVHA450WRFZ AG Choke cover

5-2 PSHEPA382WRE0 AH Sealer film

5-4 HPNL-A882WRRZ AU Door screen [R-380L(W)]

5-4 HPNL-A887WRRZ AU Door screen [R-380L(S)]

5-6 MSPRTA187WRE0 AC Spring

MISCELLANEOUS

6-6 TINSEB134WRRZ AP Instruction book

6-7 FW-VZB888WREZ AU Switch harness

6-8 FW-VZC125WREZ AT Main wire harness

DESCRIPTION

Page 40

R380L(W)

INDEX

PARTS CODE No.

[ D ]

DPWB-A462DRKZ 2-3-1 BR

[ F ] FDAI-A269WRYZ 1-2-2 AW FDORFA403WRTZ 2-5-1 BF FDTCTA230WRKZ 1-1-15 AX FH-DZA111WRKZ 1-1-4 AU FH-DZA127WRKZ 1-1-4 -FOVN-A536WRTZ 1-4-4 BF FPNLCB933WRKZ 2-3-2 BA FPNLCB936WRKZ 2-3-2 BB FPWBFA426WRKZ 1-1-12 AU FROLPA101WRKZ 1-6-1 AR FW-VZB888WREZ 2-6-7 AU FW-VZC125WREZ 2-6-8 AT

[ G ] GCABUA883WRPZ 1-2-1 BF GCABUA935WRPZ 1-2-1 BD GCOVHA450WRFZ 2-5-7 AG GCOVHA470WRFZ 1-4-6 AG GLEGPA074WRE0 1-2-3 AC GWAKPB075WRFZ 2-5-3 AU GWAKPB076WRTZ 2-5-3 BA

[ H ] HPNL-A882WRRZ 2-5-4 AU HPNL-A887WRRZ 2-5-4 AU

[ J ] JBTN-B384WRFZ 2-3-3 AG JBTN-B385WRTZ 2-3-3 AM

[ L ] LBNDKA172WRPZ 1-4-2 AM LSTPPA188WRF0 2-5-5 AG LX-CZ0052WRE0 1-7-4 AA LX-CZA073WRE0 1-7-3 AC

[ M ] MLEVPA233WRF0 1-4-5 AG MROD-A019WREZ 1-4-16 AN MSPRCA050WRE0 2-3-4 AB MSPRTA187WRE0 2-5-6 AC

[ N ] NFANJA053WRFZ 1-4-3 AG NTNT-A117WREZ 1-6-2 AS

[ P ] PCOVPA394WREZ 1-4-7 AK PCUSGA388WRP0 1-4-20 AK PCUSGA614WRPZ 1-4-14 AE PCUSGA615WRPZ 1-4-15 AE PCUSGA620WRPZ 1-4-18 AF PCUSGA693WRPZ 1-4-11 AF PCUSGA707WRPZ 1-4-21 AC PCUSUA212WRP0 1-4-17 AB PCUSUA278WRP0 1-4-12 AB PDUC-A833WRPZ 1-4-8 AM

PRICE RANK

NEW

MARK

PAR T

RANK

PARTS CODE No.

PDUC-A842WRPZ 1-4-13 AP PDUC-A854WRPZ 1-4-9 AL PHOK-A131WRFZ 1-4-1 AL PPACGA176WREZ 1-4-10 AC PSHEPA382WRE0 2-5-2 AH PSHEPB233WREZ 2-3-2-1 AP PSHEPB236WREZ 2-3-2-1 AP PSPAJA007WRFZ 1-4-19 AF

[ Q ] QACC-A139WRZZ 1-1-3 -QACC-A142WRZZ 1-1-3 AQ QACC-A156WRZZ 1-1-3 -QFS-CA026WRZZ 1-1-13 AH QFS-IA011WRZZ 1-1-14 AQ QFS-TA014WRE0 1-1-7 AG QSW-KA075DRZZ 2-3-2-2 AQ QSW-MA085WRE0 1-1-1 AF QSW-MA086WRE0 1-1-2 AF QSW-MA137WRE0 1-1-1 AH QSW-MA138WRE0 1-1-2 AH QSW-MA147WRZZ 1-1-1 AG QSW-MA148WRZZ 1-1-2 AF

[ R ] RC-QZA273WRZZ 1-1-5 AU RC-QZA293WRZZ 1-1-5 AV RC-QZA338WRZZ 1-1-5 -RLMPTA083WRZZ 1-1-8 AM RLMPTA088WRZZ 1-1-8 AN RMOTDA173WRE0 1-1-9 AX RMOTDA230WRE0 1-1-9 AS RMOTDA253WRZZ 1-1-9 AV RMOTDA265WRZZ 1-1-9 AS RMOTEA390WRE0 1-1-6 AW RMOTEA405WRZZ 1-1-6 AX RTRN-A709WRZZ 1-1-10 BM RTRN-A756WRZZ 1-1-10 BR RV-MZA295WRE0 1-1-11 BF

[ T ] TCAUHA214WRR0 1-6-4 AC TCAUHA343WRRZ 1-6-3 AF TINSEB134WRRZ 2-6-6 AP TLABMB142WRRZ 1-6-5 AK

[ X ] XEPS730P08XS0 2-3-5 AB XETS740P10000 1-7-11 AA XHPS730P06000 1-7-6 AB XHPS740P08000 1-7-7 AB XHPS740P08K00 1-7-1 AB XHTS740P08000 1-7-9 AC XHTS740P08RV0 1-7-8 AG XOTS740P08000 1-7-10 AA XOTS740P12000 1-7-5 AA XOTS740P12RV0 1-7-2 AA

PRICE RANK

NEW

MARK

PART

RANK

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