Sharp R-990KS, R-990KW, R-990K Service Manual

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Page 1

R990K(W)

SERVICE MANUAL

SX517R990KPJW

CONVECTION

MICROWAVE OVEN

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

MODELS

R-990K(S) R-990K(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.

CHAPTER 8. TEST PROCEDURES

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

CHAPTER 10. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

CHAPTER 11. MICROWAVE MEASUREMENT

CHAPTER 12. CIRCUIT DIAGRAMS

Parts List

CHAPTER 7. TROUBLESHOOTING GUIDE

SHARP CORPORATION

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

[1] GENERAL IMPORTANT INFORMATION.....1-1

[2] CAUTION MICROWAVE RADIATION ........1-1

[3] WARNING ..................................................1-1

CHAPTER 2. WARNING TO SERVICE PERSONNEL

CHAPTER 3. PRODUCT SPECIFICATIONS

CHAPTER 4. APPEARANCE VIEW

[1] OVEN .........................................................4-1

[2] TOUCH CONTROL PANEL........................4-1

CHAPTER 5. OPERATION SEQUENCE

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

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

[3] CONVECTION COOKING CONDITION.....5-1

[4] AUTOMATIC MIX COOKING CONDITION.....5-2

[5] ABSOLUTEHUMIDITYSENSOR (AH

SENSOR)COOKING CONDITION .............5-2

[6] AH SENSOR COOKING SEQUENCE .......5-3

[7] MULTI COOK .............................................5-3

[8] EASY DEFROST COOKING......................5-3

[9] FIRE SENSING FEATURE (MICROWAVE

MODE)........................................................5-3

CHAPTER 6. FUNCTION OF IMPORTANT COMPONENTS

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

[2] UPPER LATCH SWITCH, LOWER LATCH

SWITCHAND STOP SWITCH ....................6-1

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

[4] THERMAL CUT-OUT 150C (CONV.) .........6-1

[5] THERMAL CUT-OUT 95C (FAN MOTOR).....6-1

[6] TEMPERATURE FUSE 150C (MG) ...........6-1

[7] FUSE F10A 250V .......................................6-1

[8] THERMISTOR............................................6-1

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

[10] CONVECTION MOTOR .............................6-1

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

[12] CONVECTION HEATER ............................6-1

[13] CONVECTION COOKING SYSTEM..........6-2

[14] DAMPER OPEN-CLOSE MECHANISM.....6-2

[15] HIGH VOLTAGE FUSE ..............................6-2

CHAPTER 7. TROUBLESHOOTING GUIDE

[1] FOREWORD ..............................................7-1

[2] CHART .......................................................7-1

CHAPTER 8. TEST PROCEDURES

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

[2] Procedure B: POWER TRANSFORMER

TEST ..........................................................8-2

[3] Procedure C: HIGH VOLTAGE RECTIFI-

ER TEST ....................................................8-2

[4] Procedure D: HIGH VOLTAGE CAPACI-

TOR TEST..................................................8-2

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

[6] Procedure F: FUSE F10A...........................8-3

[7] Procedure G: TEMPERATURE FUSE

AND TERMAL CUT-OUT TEST ................. 8-3

[8] Procedure H: CONVECTION HEATER

TEST........................................................... 8-3

[9] Procedure I: THERMISTOR TEST ............. 8-3

[10] Procedure J: MOTOR WINDING TEST...... 8-4

[11] Procedure K: HIGH VOLTAGE FUSE

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

[12] Procedure L: NOISE FILTER TEST.......

[13] Procedure M: TOUCH CONTROL PANEL

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

[14] Procedure N: KEY UNIT (MEMBRANE

SWITCH) TEST .......................................... 8-5

[15] Procedure O: RELAY TEST........................ 8-5

[16] Procedure P: PROCEDURES TO BE TAK-

EN WHEN THE FOIL PATTERN ON THE

PRINTED WIRING BOARD (PWB) IS

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

[17] Procedure Q: AH SENSOR TEST .............. 8-6

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

[1] OUTLINE OF TOUCH CONTROL PANEL ..... 9-1

[2] DESCRIPTION OF LSI ............................... 9-1

[3] ABSOLUTE HUMIDITY SENSOR CIR-

CUIT ........................................................... 9-4

[4] SERVICING FOR TOUCH CONTROL

PANEL ........................................................ 9-5

[5] PRECAUTIONS FOR USING LEAD-

FREE SOLDER .......................................... 9-6

CHAPTER 10. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

[1] BEFORE OPERATING ............................. 10-1

[2] OUTER CASE REMOVAL ........................ 10-1

[3] POWER TRANSFORMER REMOVAL..... 10-2

[4] MAGNETRON REMOVAL ........................ 10-2

[5] HIGH VOLTAGE RECTIFIER ASSEMBLY

REMOVAL ................................................ 10-2

[6] HIGH VOLTAGE CAPACITOR REMOVAL... 10-2

[7] OVEN LAMP SOCKET REMOVAL........... 10-2

[8] HEATER UNIT ASSEMBLY REMOVAL

(HEATING ELEMENT/THERMISTOR) ..... 10-2

[9] CONTROL PANEL ASSEMBLY AND

CONTROL UNIT REMOVAL..................... 10-3

[10] TURNTABLE MOTOR AND/OR COU-

PLING REMOVAL..................................... 10-3

[11] CONVECTION MOTOR REMOVAL ......... 10-3

[12] DAMPER ASSEMBLY REMOVAL............ 10-3

[13] FAN MOTOR REPLACEMENT................. 10-3

[14] CORD HOLDER REMOVAL ..................... 10-4

[15] POWER SUPPLY CORD REPLACE-

MENT........................................................ 10-4

[16] STOP SWITCH, UPPER LATCH SWITCH,

LOWER LATCH SWITCH AND MONITOR

SWITCH REMOVAL ................................. 10-5

[17] STOP SWITCH, UPPER LATCH SWITCH,

LOWER LATCH SWITCH AND MONITOR

SWITCH ADJUSTMENT .......................... 10-5

..... 8-4

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Service Manual

CHAPTER 1. BEFORE SERVICING

[1] GENERAL IMPORTANT INFORMATION

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

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

[2] CAUTION MICROWAVE RADIATION

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

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

[3] WARNING

Never operate the oven until the following points are ensured.

(A) The door is tightly closed.

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

(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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R990K(W)

Service Manual

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

TEM DESCRIPTION

Power Requirements

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

Power Consumption

1600 W (Microwave) 1600 W (Convection)

Power Output

900 watts (IE60705C) Operating frequency 2450 MHz

Case Dimensions

Width 627 mm Height 378 mm Depth 487 mm

Control Complement

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

HIGH ................................................................................ Full power throughout the cooking time

MED HIGH ....................................................................... approx. 70% of FULL Power

MED ................................................................................ approx. 50% of FULL Power

MED LOW (DEFROST) .................................................. approx. 30% of FULL Power

LOW ................................................................................ approx. 10% of FULL Power

HELP pad SENSOR INSTANT ACTION pads MULTI COOK pad REHEAT SENSOR pad CONVECTION COOKING FUNCTION pads EASY DEFROST pad NUMBER and TEMPERATURE pads POWER LEVEL pad MEMORY padMORE. LESS pads STOP/CLEAR pad CLOCK pad INSTANT COOK/START pad

Set Weight (Approx.) 29 kg

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CHAPTER 4. APPEARANCE VIEW

[1] OVEN

1. Ventilation opening

2. Oven lamp

3. Door hinges

4. Door safety latches

5. See through door

6. Door seal and sealing surfaces

7. Door open button

8. Touch control panel

9. Digital readout

10.Wave guide cover

11.Coupling

12.Menu label

13.Rating label 14. low rack 15. High rack 16. Power supply cord 17. Turntable 18. Roller stay

[2] TOUCH CONTROL PANEL

NOTE: Some one-touch cooking features such as "INSTANT" Cook are disabled after one minute when the ovenis not in use. These fea-

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

MULTI COOK PAD Press to select Multi Cook

mode.

MORE ( ), LESS ( ) PADS Press to increase/decrease the time in one minute increments during cooking or to alter the doneness for the Sensor Instant Action, Reheat Sensor, Multi Cook or Easy Defrost modes.

POWER LEVEL PAD Press to select microwave power setting. If not pressed, HIGH is automatically selected.

EASY DEFROST PAD Press to defrost meat by entering weight only.

NUMBER AND TEMPERATURE PADS Press to enter cooking times, clock time, convection temperature or to select the Multi Cook menus.

STOP/CLEAR PAD Press to clear during programming. Press once to stop operation of oven during cooking; press twice to cancel cooking program.

CLOCK PAD Press to set Clock

HELP PAD Press to select auto start, information guide on/off, child lock, demonstration modes or info on pad. Press to get cooking information.

REHEAT SENSOR PAD Press to select 3 popular Reheat menu.

SENSOR INSTANT ACTION PADS Press once to cook or reheat 6 popular menus. (See NOTE)

CONVECTION COOKING FUNCTION PADS Press to cook for each function.

MEMORY PAD Press to enter the frequently used cooking program. Press to recall the memorized program.

INSTANT COOK/START PAD Press once to cook for 1 minute at HIGH or increase by 1 minute multiples each time this pad is pressed during Microwave, Convection, Grill or Mix cooking.

(See NOTE)

Indicator

MIX CONV

DEFROST

SENSOR

COOK KG HELP

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CHAPTER 5. OPERATION SEQUENCE

The following is a description of component functions during oven operation.

Relay and Components Connection

RELAY CONNECTED COMPONENT

RY1 Oven lamp/ Turntable motor

RY2 Power transformer

RY3 Convection heater

RY4 Damper motor

RY5 Convection motor

RY6 Fan motor

[1] OFF CONDITION

Closing the door activates all door interlock switches: upper latch switch, lower latch switch and stop switch. (In this condition, the monitor switch contacts are closed.) When oven is plugged in a wall outlet (230 - 240V, 50Hz), rated voltage is supplied to the control unit.

Figure O-1 on page 12-1

1. The display flashes “SHARP”, “MICRO-”, “WAVE”,'OVEN”.

To set any programmes or set the clock, you must first touch the STOP/CLEAR pad.

“ : “ appears in the display and the time counts up every minute.

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

this time.

2. A signal is input to the control unit, energizing the coil of shut-off

relay (RY4).

RY4 contacts close, completing a circuit to the damper motor. The damper motor now operates moving the damper to the open position, thereby closing the contacts of damper switch inputs a signal to the control unit.

The coil of relay RY4 is de-energized, opening its contacts, thereby turning off the damper motor.

[2] MICROWAVE COOKING CONDITION

1. HIGH COOKING

Enter cooking time by pressing the NUMBER pads and then select microwave cooking and power level by pressing the POWER LEVEL pad. When the START pad is touched, the following operations occur:

1. The contacts of relays are closed and components connected to

relays are turned on (RY1, RY2, RY6).(Figure O-2)

Figure O-2 on page 12-1

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

former. The voltage is converted to about3.3 volts A.C. output on the filament winding and high voltage of approximately 2260 volts A.C. on the high voltage winding.

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

ment and the high voltage (2260 volts) is sent to the voltage doubling circuit.

4. 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.

5. Upon completion of the cooking time, the power transformer, oven

lamp, etc. are turned off and the generation of microwave energy is stopped. The oven will revert to the OFF condition.

6. When the door is opened during a cook cycle, the monitor switch, upper latch switch, lower latch switch and stop switch are activated with the following results.The circuits to the turntable motor, cooling fan motor and high voltage components are de-energized, the oven lamp remains on and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation of the upper latch switch and lower latch switch and is mechanically associated with the door so that it will function in the following sequence.

1) When the door opens from a closed potion, the upper latch

switch and the lower latch switch open their contacts, and then the monitor switch contacts close.

2) When the door is closed, from the open position, the monitor

switch contacts first open, and then the contacts of the upper latch switch and lower latch switch must be closed.

If the common and normal open contacts of upper latch switch and the lower latch switch fail with their contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the fuse, upper latch switch and the lower latch switch, causing the monitor fuse to blow.

2. MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW

COOKING

When variable cooking power is programmed, the rated voltage is supplied to the power transformer intermittently through the contacts of the relay (RY2) which is operated by the control unit within a 32-second time base. Micro-wave power operation is follows:

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] CONVECTION COOKING CONDITION

1. PREHEATING CONDITION

Press the PREHEAT pad and then select preheating temperature by pressing the temperature pad. When the START pad is touched, the following operations occur:

1. The coil of shut-off relays RY1+RY5+RY6 are energized, the oven lamp, cooling fan motor, turntable motor and convection motor are turned on.

2. he coil of relay (RY4) is energized by the CPU unit.The damper is moved to the closed position, opening the damper switch contacts. The opening of the dampers witch contacts sends a signal to the LSI on the CPU unit de-energizing the relay (RY4) and opening the circuit to the damper motor.

3. The coil of heater relay (RY3) is energized by the CPU unit and the main supply voltage is added to the convection heater.

4. When the oven temperature reaches the selected preheat temperature, the following operations occur:

1) The heater relay (RY3) is de-energized by the CPU unit temper-

ature circuit and thermistor, opening the circuit to the convection heater.

VARI MODE ON TIME OFF TIME HIGH (100% power) 32 sec. 0 sec. MED HIGH (approx. 70% power) 24 sec. 8 sec. MED (approx. 50% power) 18 sec. 14sec. MED LOW (approx. 30% power) 12 sec. 20 sec. LOW (approx. 10% power) 6 sec. 26 sec.

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2) The oven will continue to function for 30 minutes, turning the convection heater on and off, as needed to maintain the selected preheat temperature. The oven will shut-down completely after 30 minutes.

2. CONVECTION COOKING CONDITION

When the preheat temperature is reached, a beep signal will sound indicating that the holding temperature has been reached in the oven cavity. Open the door and place the food to be cooked in the oven. Press the CONVEC-TION pad and then enter the cooking temperature by pressing the temperature pad. And then enter the cooking time by pressing the NUMBER pads. When the START pad is touched, the following operations occur:

1. The numbers of the digital read-out start the countdown to zero.

2. The oven lamp, turntable motor, cooling fan motor and convection motor are energized.

3. Heater relay (RY3) is energized (if the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the convection heater to return to the selected cooking temperature.

4. Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and convection motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 116°C, the circuit to(RY6) will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 116°C, at which time the relay will be de-energized, turning off the fan motor.Relay (RY5) will however, open as soon as the convection cycle has ended, turning off the convection fan motor. This will now cool and allow the damper door to open.

5. At the end of the convection cook cycle, shut-off relay(RY4) is energized turning on the damper motor. The damper is returned to the open position, closing the damper switch contacts which send a signal to the control unit, de-energizing shut-off relay (RY4).

[4] AUTOMATIC MIX COOKING CONDITION

Choose the LOW MIX or HIGH MIX by pressing the LOWMIX pad or HIGH MIX pad. And then enter cooking time by pressing the NUMBER pads. When the START pad is touched, the following operations occur:

1. The numbers of the digital read-out start the countdown to zero.

2. The shut-off relay (RY1+RY5+RY6) energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor.

3. The shut-off relay (RY4) is energized.

The damper door is closed from the open position.

4. The heater relay (RY3) is energized, adding the mains supply voltage to the convection heater.

5. Now, the oven is in the convection cooking condition.

6. When the oven temperature reaches the selected temperature, the following operations occur:

1) The power supply voltage is added to the convection heater and

power transformer alternately.

2) The convection heater operates through the heater relay (RY3)

contacts and the power transformer operates through the cook relay (RY2) contacts.

3) These are operated by the CPU unit to supply alternately within

a 48 second time base, convection heat and microwave energy.

The relationship between the convection and microwave power operations are as follows.

NOTE: The ON and OFF time ratio does not correspond with the per-

centage of microwave power, because approx. 2 seconds are needed for heating of the magnetron filament.

NOTE: During alternate Microwave/Convection operation, the con-

vection heater is energized only if the cavity temperature drops below the set temperature.

[5] ABSOLUTEHUMIDITYSENSOR (AH SENSOR)COOKING CONDITION

n case where the AH sensor is used (REHEAT SENSOR or SENSOR INSTANT ACTION), the foods are cooked in microwave cooking mode 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 vapour is developed. The sensor “senses” the vapour 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:

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

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

16 S E C . 32 S E C.

48 S E C .

LOW MIX

HIGH MIX

MICROWAVE POWE R

= APPROX. 30%

CONVECTION

TEMPER ATURE

= 200ûC

MICROWAVE POWE R

= APPROX. 10%

CONVECTION

TEMPER ATURE

= 180ûC

40 S E C .8SEC.

OFF

(MICR O.)

(CO NV E C .)

(MICR O.)

(CO NV E C .)

IC R O W A V E

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

[6] AH SENSOR COOKING SEQUENCE

1. In case the AH sensor cooking condition is started, the coil of shutoff relays (RY1+RY6) are energized, the oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.

NOTE: The oven should not be operated on AH SENSORCOOKING

immediately after plugging in the unit.Wait two minutes before coo

2. After about 16 seconds, the cook relay (RY2) 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 vapour from the oven cavity and sensor.(Figure O-2)

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

CLEAR pad.

3. The oven will go to the Mix Cooking Condition at the2nd. or 3rd. stage when Reheat pie, Casseroles or Desserts has been chosen. (Figure O-3)

4. When the sensor detects the vapour 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 food, turn it or season, etc.

NOTE: In case where a small quantity of food is cooked, the oven will

stop without displaying the remaining cooking time.

5. When the timer reaches zero, an audible signal sounds.The shutoff relay (RY1+RY6) and cook relay (RY2) 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.

[7] MULTI COOK

MULTI COOK will automatically compute and set the oven temperature, microwave power and cooking time for baking and roasting. Set the desired program by touching the MULTI COOK pad, and number pad. Enter the weight by touching the Number pads. When the START pad is touched, the oven works on Mix cooking mode, Convection cooking mode or Preheating mode according to the special cooking sequence.

[8] EASY DEFROST COOKING

The EASY DEFROST key is a special function key to defrost meats and poultry faster and better.EASY DEFROST key has 4 defrost stages.EASY DEFROST automatically defrosts roast beef, etc.When EASY DEFROST is selected and the food weight is entered by using the number pads, the oven will cook according to the special cooking sequence. (Figure O-2)

[9] FIRE SENSING FEATURE (MICROWAVE MODE)

This model incorporates a sensing feature which will stop the oven's operation if there is a fire in the oven cavity during microwave cooking.

This accomplished by the LSI repeatedly measures the voltage across the temperature measurement circuit (thermistor) during it's 32-seconds time base comparing the obtained voltage measurements. If the most recent volt-age measured is 300mV grater than the previous voltage measured, the LSI judges it as a fire in the oven cavity and switches off the relays to the power transformer, fan motor and convection motor. The LSI also stops counting down and closes the damper door so that no fresh air will enter the oven cavity. Please refer to the following section for a more detailed description.

Operation

Please refer to the timing diagrams below.

1. The thermistor operates within a 32-seconds time base and it is energized for three (3) seconds and off for 29seconds. Two (2) seconds after the thermistor is energized, the voltage across the temperature measurement circuit is sampled by the LSI and twenty one (21) seconds after the thermistor is cut off the LSI turns on the cooling fan for six (6) seconds.

2. The above procedure is repeated. If the difference between the first voltage measured (in step 1) and the voltage measured when the procedure is repeated (step 2) is greater than 300mV the LSI makes the judgment that there is a fire in the oven cavity and will switch off the relays to the power transformer, fan motor and convection motor. The LSI also stops counting down and closes the damper door so that no fresh air will enter the oven cavity.

3. Once the fire sensor feature has shut the unit down, the programmed cooking cycle may be resumed by pressing the “START” pad or the unit may be reset by pressing the “CLEAR” pad.

IMPORTANT:

During sensor cooking operation, the fire sensing operation sequence will not begin until the AH sensor has detected vapours and initiated a sensor cooking cycle. This is because the operation of the convection fan would interfere with the AH sensor's vapour detection.

MIC R OW A V E

AH S E NS OR

CONVECTION

MOT O R

THERMISTOR

Sensing

Voltage

OFF

0 23 24 30 32(sec.) 64(sec.)

3sec.

S ens ing the voltage across tempe rature mea surement circ uit.

6sec.

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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 lever 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] UPPER LATCH SWITCH, LOWER LATCH SWITCH AND STOP 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

The monitor switch is mounted on the latch hook. It is activated (the contacts opened) by the lower latch head when the door is closed. The switch is intended to render the oven inoperative by means of blowning the fuse when the contacts of the common and normal open contacts of upper latch switch and lower latch switch fail to open when the door is opened.

Functions:

1. When the door is opened, the monitor switch contacts close (to the ON condition) due to their being normally closed. At this time the common and normal open contacts of upper latch switch and lower latch switch are in the OFF condition (contacts open) due to their being normally open contacts switch.

2. WAs the door goes to a closed position, the monitors witch contacts are first opened and then the common and normal open contacts of upper latch switch close.(On opening the door, each of these switches operate inversely.)

3. If the door is opened during cooking, and the common and normal open contacts of upper latch switch and lower latch switch fail to open, the fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN FUSETEST THE

UPPER LATCH SWITCH, LOWERLATCH SWITCH AND MONITOR SWITCHFOR PROPER OPERATION. (REFER TOCHAPTER “TEST PROCEDURE”)

[4] THERMAL CUT-OUT 150C (CONV.)

The oven thermal cut-out located on the left side of the thermal protection plate is designed to prevent damage to the convection heater unit if an overheated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc. Under normal operation, the oven thermal cut-out remains closed. How-ever, when abnormally high temperatures are reached within the heater unit, the oven thermal cut-out will open, causing the oven to shut down. When the oven has cooled temperature, the oven thermal cut-out closes.

[5] THERMAL CUT-OUT 95C (FAN MOTOR)

The thermal cut-out protect the fan motor against over-heating. If its temperature goes up higher than 95°C because the fan motor is locked or the ventilation operating are blocked, the contacts of the thermal cut-out will open and switch off the oven. When the thermal cut-out cools itself down to 75°C, the contacts of the thermal cut-out will close again.

[6] TEMPERATURE FUSE 150C (MG)

This fuse protects the magnetron against overheating. If the temperature goes up higher than 150°C because the fan motor is interrupted, the air inlet duct is blocked or the ventilation openings are obstructed, the fuse blows and cuts off the power supplying to the power transformer. The defective fuse must be replaced with new rated one.

[7] FUSE F10A 250V

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

2. The fuse also blows when upper latch switch and lower latch switch remain closed with the oven door open and when the monitor switch closes.

[8] THERMISTOR

The thermistor is a negative temperature coefficient type.The temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the heating element relay to operate, thus the current to the heating element is turned ON/OFF.

[9] TURNTABLE MOTOR

The turntable motor drives the turntable supporting plate to rotate the turntable.

[10] CONVECTION MOTOR

The convection motor drives the convection fan and provides the heated air.

[11] FAN MOTOR

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

[12] CONVECTION HEATER

The convection heater is located at the rear of the oven cavity. It is intended to heat air driven by the convection fan. The heated air is kept in the oven and force-circulated and reheated by the convection heater.

LATCH HOOK

LATCH HE ADS

STOP SWITCH

MON IT OR S WIT C H

LOWE R LATCH S WITC H

SWITCH LEVER

OPE N LE VE R

DOOR OP E N BUTTON

UPPER LATCH S WITCH

Page 11

R990K(W)

6 – 2

[13] CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated by the convection heater, but is heated by forced circulation of the hot air produced by the convection heater. The air heated by the convection heater is circulated through the convection passage provided on the outer casing of the oven cavity by means of the convection fan which is driven by the convection motor. It then enters the inside of the oven through the vent holes provided on the left side of the oven. Next, the hot air heats the food on the turntable and leaves the oven cavity through the vent in the oven cavity left side wall. Without leaving the oven, this hot air is reheated by the convection heater, passes through the convection passage and enters the inside of the oven cavity again, in a continuing cycle. In this way, the hot air circulates inside the oven cavity to raise its temperature and, at the same time, comes into contact with the food being cooked. When the temperature inside the oven cavity reaches the selected temperature, the convection heater is de-energized. When the temperature inside the oven cavity drops below the selected temperature, the convection heater is energized again. In this way, the inside of the oven cavity is maintained at approximately the selected temperature.When the convection time reaches 0, the convection heater is de-energized and the convection fan stops operating and the oven shuts off. Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and convection motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 116°C, the circuit to RY6will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 116°C, at which time the relay will be de-energized, turning off the fan motor. Relay RY5 will how-ever, open as soon as the convection cycle has ended, turning off the convection fan motor. This will now cool and allow the damper door to open.

[14] DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except during convection cooking.Damper position is set automatically by damper motor, damper switch, motor cam and damper shaft.These components are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the CPU unit.

1. Microwave Cooking:

Damper is in the open position, because a portion of cooling air is channelled through the cavity to removes team and vapours given off from the heating foods.It is then exhausted at the top of the oven cavity into a condensation compartment.

2. Convection Cooking:

Damper is in the closed position, so that no hot air will be allowed to leak out the oven cavity.

3. Damper Operation

1. When power supply cord is plugged in:

1) When power supply cord is plugged in, a signal is sensed in the control unit, and operates shut-off relay(RY4).

2) Contacts of shut-off relay (RY4) close, the damper motor is energized, opening the damper door.

3) When the damper is moved to the open position by the damper cam, damper switch is closed (ON position).

4) The signal of damper switch is re-sensed in the control unit and shut-off relay (RY4) is turned off.

5) The rated voltage to the damper motor is stopped and the motor turns off.

2. When oven is microwave cooking:

Damper is in the open position

3. When oven is convection cooking:

1) Damper motor is energized by touching the convection, temperature and START pads.

2) When damper is in the closed position (dampers witch is OFF), its signal is sensed by the control unit, and shut-off relay (RY4) is de-energized.

3) The damper is held in the closed position during the convection cooking operation.

4) .At the end of the convection cooking, shut-off relay (RY4) is energized, and the damper is returned to the open position.

NOTE: If the damper door is not in the proper position, closed during

convection or open during microwave, the control unit will stop oven operation after 1 minute.

Figure D-2. Damper Mechanism

[15] HIGH VOLTAGE FUSE

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

Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Sensor cooking OPEN Automatic mix cooking CLOSE Grill cooking CLOSE Slow cooking CLOSE

DAMPE R DUC T

DAMPE R

DAMPE R C AM

DAMP E R MO TO R

DAMPE R S WIT C H

DAMPE R S HAF T

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R990K(W)

Service Manual

CHAPTER 7. TROUBLESHOOTING GUIDE

[1] FOREWORD

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 upper latch switch - lower latch switch - monitor switch circuit, check the upper latch switch, lower latch switch and monitor switch before replacing the fuse F10A.

[2] CHART

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

LATCH AND STOP SWITCHES

MONITOR SWITCH

DAMPER SWITCH

MAIN FUSE

TEMPERATURE FUSE 150C

THERMAL CUT-OUT

CONVECTION HEATER

THERMISTOR

FAN MOTOR

TURNTABLE MOTOR

CONVECTION MOTOR

DAMPER MOTOR

HIGH VOLTAGE FUSE

TOUCH CONTROL PANEL

KEY UNIT

RELAY (RY-1)

RELAY (RY-2)

RELAY (RY-3)

RELAY (RY-4)

RELAY (RY-5)

RELAY (RY-6)

FOIL PATERN ON P.W.B.

AH. SENSOR

OVEN LAMP OR SOCKET

PENED OR SHORTED WIRE HARNESS

WALL OUTLET

LOW POWER SUPPLY VOLTAGE

SHORTED POWER CORD

NOISE FILTER

CK = Check / RE = Replace

OFF CONDITION

ABCDEEEF GGHI J J J J K MNOOOOOOPQRE CKCK CK RE L

COOKING CONDITION

(MICROWAVE)

PROBLEM

CONDITION

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

(AH. SENSOR)

(CONVECTION)

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

Fuse M8A blows when power cord is plugged into wall outlet.

Oven lamp does not light with door opened.

Oven lamp does not light at all

Cooling fan motor does not operate.

The oven stops after1 minute.

Oven lamp light, but turntable motor does not operate.

Oven does not go into a cook cycle, when START pad is touched.

Function of variable cooking does not operate properly except HIGH power.

Oven is in the sensor cook-ing condition but AH sensor does not end 1st. stage or does not stop cooking cycle or the oven stops soon.

CONV indicator lights, but heating element does not heat.

Temperature in the oven cavity is lower or higher than preset.

Convection cycle runs 1 minute then the oven shuts down.

Convection cycle runs 3 minutes then the oven shuts down.

Extremely uneven heating is produced in oven load (food).

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

Display does not operate properly when STOP/ CLEAR pad is touched. (The time of day should appear on the display with beep sound during normal condition.)

Low or no power is produced during microwave cooking (The food is heated incom-pletely or not heated at all)

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Service Manual

CHAPTER 8. TEST PROCEDURES

[1] Procedure 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 90 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 ..................................................... 47 sec. Mass of container (mc) ...................................... 330 g

T2 .................................................... Final Temperature T = T2 - T1 P = 90 x T + 0.55 x mc (T2-T0)/47

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

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

Temperature after (47 + 3) = 50 sec ...................................... T2 = 21°C

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

Measured output power

The equation is "P = 90 x T" .................... P = 90 x 10°C = 900 Watts

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8 – 2

[2] Procedure B: POWER TRANSFORMER TEST

1. CARRY OUT 3D CHECKS.

2. 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 winding. The following readings should be obtained:

a.Primary winding -------------------- approx. 1.2Ω

b.Secondary winding ----------------- approx. 66Ω

c.Filament winding -------------------less than 1Ω

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

3. Also, the power transformer has the thermal cut-out in the primary coil. The thermal cut-out will open when the temperature of the thermal cut-out in the primary coil reaches approximately 150°C. The thermal cut-out resets automatically at 130°C. If an ohmmeter indicates an open circuit under normal condition, replace the power transformer because the primary coil (thermal cut-out) has opened. An open primary coil (thermal cutout) indicates overheating of the power transformer. Check for restricted air flow to the power transformer, especially the ventilation opening.

4. CARRY OUT 4R

CHECKS.

[3] Procedure 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] Procedure 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.

1000g

T1 C

T2 C

Heat up for 50 sec.

HIGH VOLTAGE RECTIFIER

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8 – 3

[5] Procedure 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] Procedure F: FUSE F10A

CARRY OUT 3D CHECKS.

1. If the fuse F10A is blown, there could be shorts or grounds 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 upper latch switch, lower latch switch and monitor switch.

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

CARRY OUT 4R

CHECKS.

CAUTION: Only replace fuse with the correct value replacement.

[7] Procedure G: TEMPERATURE FUSE AND TERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the temp. fuse or thermal cut-out. Then using an ohmmeter, make a continuity test across the two terminals as described in the table below.

If incorrect readings are obtained, replace the temp. fuse or thermal cut-out.;

An open circuit temperature fuse 150°C (MG)/ thermal cut-out 145°C (MG) indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out 150°C (CONV.) indicates that the convection motor has over heated, this may be due to convection motor locked.

An open circuit thermal cut-out 95°C (FM) indicates that the fan motor winding has overheated, this may be due to blocked ventilation or locked cool- ing fan.

CARRY OUT 4R

CHECKS.

[8] Procedure H: CONVECTION HEATER TEST

CARRY OUT 3D CHECKS.

Before carrying out the following tests make sure the heater is fully cool.

1. Resistance of heater

Disconnect the wire leads to the heater to be tested. Using ohmmeter with low resistance range.

Check the resistance across the terminals of the heater.

The resistance of heater is approximately 37.5 ohms.

2. Insulation resistance

Disconnect the wire leads to the heater to be tested. Check the insulation resistance between the element and cavity using a 500V - 100M ohms insulation tester. The insulation resistance should be more than 10M ohms in the cold start.

If the results of above test 1 and/or 2 are out of above specifications, the heater is probably faulty and should be replaced.

CARRY OUT 4R

CHECKS.

[9] Procedure I: THERMISTOR TEST

CARRY OUT 3D CHECKS.

Disconnect connector-E from the CPU unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4 of the thermistor harness.

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 and Thermal cut-out 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 (MG) This is not resetable type. Above 150°C Closed circuit Thermal cut-out 145°C (MG) This is not resetable type. Above 145°C Closed circuit Thermal cut-out 150°C (CONV.) Below 130°C Above 150°C Closed circuit Thermal cut-out 95°C (FAN) Below 75°C Above 95°C Closed circuit

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R990K(W)

8 – 4

Room Temp...................20°C - 30°C

Resistance.....................Approx. 350kΩ - 155kΩ

If the meter does not indicate above resistance, replace the thermistor.

CARRY OUT 4R

CHECKS.

[10] Procedure J: 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.

[11] Procedure K: 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.

[12] Procedure L: 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.

[13] Procedure M: TOUCH CONTROL PANEL ASSEMBLY TEST

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

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. Replace the control unit. Before replacing the control unit, perform the Key unit test (Procedure N) 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.

Table: Resistance of Motor

Motors Resistance Fan motor Approximately 295 Ω Turntable motor Approximately 19.2 kΩ Convection fan motor Approximately 210 Ω Damper motor Approximately 11 kΩ

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

FUSE F10A

LINE CROSS CAPACITOR 0.22μ / AC 250V

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022μ /AC 250V

LINE BYPASS CAPACITOR

0.0022μ /AC 250V

NOISE FILTER

WHT

RED

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R990K(W)

8 – 5

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.

[14] Procedure N: 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 door sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch 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.

[15] Procedure O: RELAY TEST

CARRY OUT 3D CHECKS.

Remove the outer case and check voltage between Pin No 9 of the 5-pin connector (A) and the common terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should indicate230 - 240 volts, if not check oven circuit.

Shut-off, Cook and Heater 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 or convection cooking operation.

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

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

CARRY OUT 4R

CHECKS.

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

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

Problem: POWER ON, indicator does not light up.

CARRY OUT 3D

CHECKS.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 APPROX. 21.0V D.C. Oven lamp / Turntable motor

RY2(COOK) APPROX. 21.0V D.C. Power transformer

RY3(HEATER) APPROX. 20.0V D.C. Heating element

RY4 APPROX. 21.0V D.C. Damper motor RY5 APPROX. 21.0V D.C. Convection motor RY6 APPROX. 21.0V D.C. Cooling fan motor

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated voltage is not applied between Pin No. 9 of the 5-pin connector (A) and the common terminal of the relay RY1.

Check supply voltage and oven power cord.

890

STOP

CLEAR

REHEAT

PIE

EASY

DEFROST

LESS

POWER

LEVEL

40°C

70°C

130°C

150°C

160°C

180°C

200°C

220°C 230°C

250°C

HIGH MIX

LOW MIX

CONVEC

GRILL

MEMORY

PREHEAT

CLOCK

HELP

REHEAT SENSOR

MULTI COOK

FROZEN

VEGETABLES

FRESH

VEGETABLES

DESSERTS

JACKET

POTATO

INSTANT COOK

START

CASSEROLES

G5 G6 G7 G8 G9 G10 G11 G12

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8 – 6

NOTE: *At the time of making these repairs, make a visual inspection of the varis-

tor.check for burned damage and examine the transformer with an ohmmeter for the presence of layer short-circuit (check primary coil resistance). If any abnormal condition is detected, replace the defective parts.

CARRY OUT 4R

CHECKS.

[17] Procedure Q: AH SENSOR TEST

Checking the initial sensor cooking condition

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

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 (7.2 oz.) of tap water in a 1000 milliliter measuring cup.

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

3) Close the door.

4) Touch REHEAT SENSOR pad twice and touch INSTANT COOK/START pad. Now, the oven is in the sensor cooking condition and “SOUP”, “SENSOR” and “REHEAT” 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, and the display should start to count down the remaining cooking time and oven should turn off after water is boiling (bubbling).If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanationbelow.

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 oven from power supply and remove outer case.

2) Discharge the high voltage capacitor.

3) Remove the AH sensor.

4) Install the new AH sensor.

5) Re-install the outer case.

6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as follows:

a) Fill approximately 200 milliliters (7.2 oz.) 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 REHEAT SENSOR pad twice and touch the INSTANT COOK/START pad.

e) The control panel is in automatic Sensor operation.

2 The rated voltage is applied to primary side of power transformer.

Power transformer or secondary circuit defective.

Check and repair. 3 Only pattern at “a” is broken. *Insert jumper wire J1 and solder. 4 Pattern at “a” and “b” are broken. *Insert the coil RCILF2003YAZZ between “c” and “d”.

357 9

CN - A

VRS 1

CONV M FAN M POWER

(J1)

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R990K(W)

8 – 7

f) The display will start to count down the remaining cooking time, and the oven will turn off automatically after the water is boiling (babbling).

If new sensor dose not operate properly, the problem is with the control unit.

2. CHECKING CONTROL UNIT

1) Disconnect oven from power supply and remove outer case.

2) Discharge the high voltage capacitor.

3) Disconnect the wire leads from the cook relay.

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

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

6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as follows:

a) Touch REHEAT SENSOR pad twice and touch the INSTANT COOK/START pad.

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

c) After approximately 20 seconds, push plunger of select switch. This condition is same as judgement by AH sensor.

d) After approximately 3 seconds, the display shows “X X. X X “ which is the remaing cooking time, and the display counts down.

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

R1,R2:22Ω±1% 1/2W

R3:4.3kΩ±?5% 1/4W

R4:1MΩ±5% 1/4W

Sensor Dummy Resistor Circuit

Plunger

COM

R3 R4

F-1 F-2

F-3

To connector (F) on Control U nit.

CONNECTOR

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9 – 1

R990K(W)

Service Manual

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

[1] OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units as shown in the touch control panel circuit.

(1) Key Unit (2) Control Unit

The principal functions of these units and their related signals 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 P10-P17.When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through R24-R27to perform the function that was requested.

2. Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit, temperature measurement circuit, absolute humidity sensor circuit and indicator circuit.

1) LSI

This LSI controls the temperature measurement signal, AH sensor signal, key strobe signal, relay driving signal for oven function and indicator signal.

2) Power Source Circuit

This circuit generates the voltages necessary for the control unit from the AC line voltage.

3) Synchronizing Signal Circuit

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

4) ACL Circuit

A circuit to generate a signals which resetting the LSI to the initial state when power is applied.

5) Buzzer Circuit

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

6) Temperature Measurement Circuit: (OVENTHERMISTOR)

The temperature in the oven cavity is sensed by the thermistor. The variation of resistance according to sensed temperature is detected by the temperature measurement circuit and the result applied to LSI. The LSI uses this information to control the relay and display units.

7) Absolute Humidity Sensor Circuit

This circuit detects the humidity of a food which is being cooked, to control its automatic cooking.

8) Stop Switch

A switch to inform the LSI if the door is open or closed.

9) Relay Circuit

To drive the magnetron, heating element, fan motor, convection motor, damper motor, turntable motor and light the oven lamp.

10)Indicator Circuit

Indicator element is a Fluorescent Display.Basically, a Fluorescent Display is triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode.The Fluorescent Display has 8-digits, 16segments are used for displaying figures.

[2] DESCRIPTION OF LSI

The I/O signal of the LSI (IZA840DR) are detailed in the following table.

Pin No. Signal I/O Description

1 VCC IN Connected to GND.

2 VEE IN

Anode (segment) of Fluorescent Display light-up voltage: -30V.

Vp voltage of power source circuit input.

3 AVSS IN

Power source voltage: -5V.

VC voltage of power source circuit input.

4VREFIN

Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)

5AN7IN

Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D coverter built into the LSI.

6AN6IN

AH sensor input.

This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into

the LSI.

7-9 AN5-AN3 IN Heating constant compensation terminal.

10 AN2 IN

Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal(0V). Door opened; "L" level signal(-5V).

11 AN1 IN

Input signal which communicates the damper open/close information to LSI.

Damper opened; "H" level signal(0V:GND). Damper closed; "L" level signal(-5V).

12 AN0 IN

Temperature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into temperature by the A/D converter built into the LSI.

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9 – 2

13 P55 OUT

Digit selection signal.

The relationship between digit signal and digit are as follows; Digit signal Digit

P02..........................2nd.

P03...........................1st.

P01...........................3rd.

P00...........................4th.

P37...........................5th.

P36.......................... 6th.

P35.......................... 7th.

P55.......................... 8th.

Normally, one pulse is out put in every speriod, and input to the grid of the Fluorescent Display.

14 P54 OUT

Oven lamp and turntable motor driving signal. (Square Waveform : 50Hz)

To turn on and off the shut-off relay(RY1). The square waveform voltage is delivered to the relay(RY1) driving circuit.

15 P53 OUT

Convection motor driving signal.

To turn on and off shut-off relay(RY5). "L" level during CONVECTION; "H" level otherwise.

16 P52 OUT

Cooling fan motor driving signal.

To turn on and off shut-off relay(RY6). "L" level during both microwave and convection cooking; "H" level otherwise.

17 P51 OUT

Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay(RY2). In HIGH operation, the signals holds "L" level during microwave cooking and "H" level while not cooking. In other cooking modes (MED HIGH, MED, MED LOW, LOW) the signal turns to "H" level and "L" level in repetition according to the power level.

18 P50 OUT

Damper motor relay driving signal.

To turn on and off shut-off relay(RY4).

19 P47 OUT

Heating element driving signal.

To turn on and off shut-off relay(RY3). "L" level during convection cooking; "H" level otherwise. During convection cooking, the signal becomes "H" level when the temperature of the oven cavity exceeds the predetermined temperature.

20-21 P46-P45 OUT Terminal not used.

22 P44 OUT

Timing signal output terminal for temperature measurement(OVEN THERMISTOR).

H level (GND) : Thermistor OPEN timing. L level (-5V) : Temperature measuring timing.(Convection cooking)

23 P43 OUT

Signal to sound buzzer.

A: key touch sound. B: Completion sound. C: When the temperature of the oven cavity reaches the preset temperature in the preheating mode, or when the preheating hold time (30 minutes) is elapsed.

24 P42 OUT

Timing signal output terminal for temperature measurement(OVEN).

H level (GND) : Thermistor OPEN timing. L level (-5V) : Temperature measuring timing.(Convection cooking)

Pin No. Signal I/O Description

P03

ß(50Hz)

GND

P02

P01

P00

P37

P36

P35

P55

During cooking

20 msec.

OFF

During cooking

GND

(Convection)

OFF

During

cooking

GND

VARI MODE ON TIME OFF TIME

HIGH (100% power) 32 sec. 0 sec.

MED HIGH (approx. 70% power) 24 sec. 8 sec.

MED (approx. 50% power) 18 sec. 14 sec.

MED LOW (approx. 30% power) 12 sec. 20 sec.

LOW (approx. 10% power) 6 sec. 26 sec.

OFF

H:GND

OFF

During

cooking

GND

(Convection)

H: G ND

0.12 s ec

2.4 s ec

1.2 s ec

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9 – 3

25 INT1 IN

Signal to synchronize LSI with commercial power source freqency.

This is the basic timing for all real time processing of LSI.

26 P40 IN Connected to GND.

27 RST IN

Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level.

28/29 XCIN/XCOUT OUT Terminal not used.

30 XIN IN

Internal clock oscillation frequency setting input.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal.

31 XOUT OUT

Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

32 VSS IN

Power source voltage: -5V.

VC voltage of power source circuit input.

33 P27 IN

Signal coming from touch key.

When any one of G-1 line keys on key matrix is touched, a corresponding signal from P17 - P17 will be input into P27. When no key is touched, the signal is held at "L" level.

34 P26 IN

Signal similar to P27.

When any one of G-2 line key on key matrix is touched, a corresponding signal will be input into P26.

35 P25 IN

Signal similar to P27.

When any one of G-3 line key on key matrix is touched, a corresponding signal will be input into P25.

36 P24 IN

Signal similar to P27.

When any one of G-4 line key on key matrix is touched, a corresponding signal will be input into P24.

37 P23 OUT

Segment data signals.

The relation between signals and indicators are as follows: Signal Segment Signal Segment Signal Segment Signal Segment

P23...............P1 P17...............P5 P13...............P9 P07.............P13

P22...............P2 P16...............P6 P12.............P10 P06.............P14

P21...............P3 P15...............P7 P11.............P11 P05.............P15

P20...............P4 P14...............P8 P10.............P12 P04.............P16

38-40 P22-P20 OUT

Segment data signal.

Signal similar to P23.

41 P17 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-12 line keys on

key matrix is touched.

42 P16 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-11 line keys on key matrix is touched.

43 P15 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-10 line keys on

key matrix is touched.

44 P14 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-9 line keys on key matrix is touched.

45 P13 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-8 line keys on key matrix is touched.

46 P12 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-7 line keys on key matrix is touched.

Pin No. Signal I/O Description

20 msec.

H : GND

L (-5V)

Page 23

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9 – 4

[3] 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.

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 AN6terminal. 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 R50-1. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AN7 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 the bridge circuit is deviated to increase the voltage available atAN6 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 operation automatically.When the LSI starts to detect the initial voltage at AN6terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is not possible to balance of 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

47 P11 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-6 line keys on key matrix is touched.

48 P10 OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-5 line keys on key matrix is touched.

49-53 P07-P03 OUT

Segment data signal.

Signal similar to P23.

54-56 P02-P00 OUT

Digit selection signal.

Signal similar to P55.

57-59 P37-P35 OUT

Digit selection signal.

Signal similar to P55.

60-64 P34-P30 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

Pin No. Signal I/O Description

Ventilation openings

View of sensor case removed

Sensing part (Open vessel)

Sensing part (Closed vessel)

Sensing part (Open vessel)

Sensing part (Closed vessel)

Cross section view

Sensor case

Thermistor element

Operational amplifie r

Output voltage

S:Thermistor

open vessel

C:Thermistor

closed vessel

Ab so lute h umidi ty ( g/m )

tvoltage

Ab so lute h umidi ty v s , output voltage cha racteristic

SW2

SW1

SW3

SW4

SW5

P30

P31

P32

P33

P34

LS I

(IC1)

AN7

AN6

620k

300k

150k

75k

37.4k

47k

10k

0.01μF

0.015μF

0.01μF

360k

VA : -15V

R51

F-2

1.8k

F-1

F-3

3.57k

3.32k

VC : -5V

0.1

μF

C. Thermistor in

closed vesssl

S. Thermistorin

open vessel

IC2(IZ A495DR )

Page 24

R990K(W)

9 – 5

[4] 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 outputterminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc, and sometimes it is not fully protected by the built-in protection circuit.

In order to protect CMOS LSI.

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

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

2. Shapes of Electronic Components

3. Servicing of Touch Control Panel

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

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

CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICRO-

WAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD.

Therefore, when checking the performance of the touch control panel, put the outer cabinet on the oven to avoid touching the high voltage transformer, or unplug the primary terminal (connector) of the high voltage transformer to turn it off; the end of such connector must be insulated with an insulating tape.After servicing, be sure to replace the leads to their original locations.

1) 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 (sensorrelated ones included) of the touch control panel while keeping it connected to the oven.

2) On some models, the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other. For those models, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummyresistor(s) with resistance equal to that of the controls are used.

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

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

4. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 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

5. 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.

appro x. 1M ohm

Transistor 2SB1238

Transistor DTA123ES KRA101M KRA223M KRC243M

Page 25

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9 – 6

[5] 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

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10 – 1

R990K(W)

Service Manual

CHAPTER 10. 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, Convection motor, Convection fan, Convection fan belt, Pulley, Turntable motor, Damper motor, Damper door assembly.

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 the screws from rear and along the side edge of case.

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

5. Lift the entire case from the oven.

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.

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10 – 2

[3] POWER TRANSFORMER REMOVAL

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from power transformer.

3. Disconnect the filament leads of the power transformer from the magnetron and high voltage capacitor.

4. Disconnect the high voltage fuse from the transformer.

5. Remove the two (2) screws and one (1) washer holding the transformer to the base cabinet.

6. Remove the transformer.

2. RE-INSTALL

1. Rest the transformer on the base cabinet with its primary terminals toward rear cabinet.

2. Insert the two edges of the transformer into two metal tabs of the base cabinet.

3. Make sure the transformer is mounted correctly to the corners underneath those tabs.

4. After re-installing the transformer, secure the transformer with two screws to the base cabinet, one is with outertooth washer and the other is without outer-tooth washer.

5. Re-connect the wire leads (primary) and high voltage fuse to the transformer and filament leads of transformer to the magnetron and capacitor, referring to the “Pictorial Diagram”.

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

NOTE: LIVE (ORANGE) WIRE MUST BE CONNECTED TO THE

CABINET-SIDE OF THE POWER TRANSFORMER.

[4] MAGNETRON REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect filament lead of transformer and high voltage wire lead from magnetron.

3. Take off three (3) screws secured the chassis support to oven cavity and waveguide.

4. Remove the cooling fan assembly refer to “Cooling Fan Removal”.

5. Carefully remove four (4) mounting screws holding the magnetron and magnetron air guide to waveguide.

When removing the screws hold the magnetron and magnetron air guide to prevent it from falling.

6. Remove the magnetron from the waveguide with care so the magnetron antenna should not hit by any metal object around the antenna.

CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE THE

R.F. GASKET IS IN PLACE ANDTHE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.

[5] HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove one (1) screw holding the high voltage rectifier terminal to the capacitor holder.

3. Disconnect the high voltage rectifier assembly from the capacitor.

CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER

ASSEMBLY, ENSURE THAT THE EARTHING SIDE TERMINAL MUST BE SECURED FIRMLY WITH AN EARTHING SCREW.

[6] HIGH VOLTAGE CAPACITOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the high voltage fuse and rectifier assembly from the high voltage capacitor.

3. Disconnect filament lead of transformer from high voltage capacitor.

4. Remove one (1) screw holding the high voltage rectifier from the capacitor holder.

5. Remove one (1) screw holding capacitor holder to rear cabinet.

6. Remove the high voltage capacitor from the holder.

[7] OVEN LAMP SOCKET REMOVAL

1. CARRY OUT 3D CHECKS.

2. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the flat type small screw driver.

3. Lift up the tab of oven lamp mounting plate holding the oven lamp socket.

4. Slide the oven lamp socket left-ward.

5. Now, the oven lamp socket is free.

[8] HEATER UNIT ASSEMBLY REMOVAL (HEATING ELEMENT/THERMISTOR)

1. HEATER UNIT

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from oven thermal cut-out, convection motor, thermistor and heater element. Remove convection motor assembly refer to “Convection Motor Removal No.3 to No.5”.

3. Remove eleven (11) screws holding heater duct to the oven cavity.

4. Release two (2) snap bands holding wire harness to the thermal protection plate (left).

5. The heater unit is now free.

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flat type small screw driver

Page 28

R990K(W)

10 – 3

2. HEATING ELEMENT AND THERMISTOR

1. Remove two (2) screws holding heating element to heater duct.

2. Loosen two (2) screws holding holders to heater duct and take heating element out of heating element holders.

3. Heating element is free.

4. Remove two (2) screws holding thermistor to heater duct.

5. Thermistor is free.

[9] CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect connector CN-A, CN-E and CN-F from the control unit.

3. Disconnect the wire leads from relays RY1, RY2 and RY3.

4. Remove one (1) screw holding the control panel back plate to the chassis support.

5. Remove the one (1) screw holding the bottom edge of he back plate to the cabinet base.

6. Remove two (2) screws holding the back plate to the oven cavity flange.

7. Lift up and pull the control panel forward.

1. CONTROL UNIT AND KEY UNIT

1. Disconnect the flat ribbon cable from the control unit.

2. Remove the four (4) screws holding the panel frame to the back plate.

Now, the control unit and frame assembly are separated.

3. Separate the panel frame and back plate.

4. Remove the three (3) screws holding the control unit to the panel frame.

5. Lift up the control unit.

6. Replacement of individual component is as follows:

NOTE: 1) Before attaching a new key unit, remove remaining adhe-

sive on the control panel frame surfaces completely with a soft cloth soaked in alcohol.

2) When attaching the key unit to the control panel frame, adjust the upper edge and right edge of the key unit to the correct position of control panel frame.

3) Stick the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch.

[10] TURNTABLE MOTOR AND/OR COUPLING REMOVAL

1. Disconnect the oven from power supply.

2. Remove one (1) screw holding the turntable motor cover to the base cabinet and take off the turntable motor cover.

3. Disconnect wire lead from the turntable motor.

4. Remove the two (2) screws holding the turntable motor to the mounting plate of the oven cavity bottom.

5. Pull the turntable coupling out of the oven cavity.

6. Turntable coupling and motor will be free.

[11] CONVECTION MOTOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. .Disconnect wire leads from the convection motor.

Remove the convection fan belt and pulley (M).

3. Remove two (2) screws holding the convection motor mounting angle to the heater duct and base cabinet.

4. Take out the convection motor assembly from the unit.

The convection motor assembly is now free

5. Remove two (2) screws and nuts holding the motor to mounting angle.

6. Convection motor is now free.

[12] DAMPER ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove cooling fan motor and magnetron refer to “Cooling Fan Motor Removal” and “Magnetron Removal”.

3. Disconnect wire leads from damper motor and dampers witch.

4. Remove two(2) vanished screws holding damper motor angle to thermal protection plate (right).

5. Damper assembly is free.

6. Remove one (1) screw holding damper motor to damper motor angle and one (1) screw holding damper switch to damper motor angle.

7. Damper motor and switch are free.

[13] FAN MOTOR REPLACEMENT

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the fan motor and thermal cut-out.

3. Remove the three (3) screws holding the chassis support to rear cabinet, control panel back plate and waveguide.

4. Remove one (1) tab holding the fan duct to air guide.

5. Remove the fan motor assembly from the oven cavity.

6. Remove the fan blade assembly from the fan motor shaft according the following procedure.

1) Hold the edge of the rotor of the fan motor by using a pair of

grove joint pliers.

CAUTION:

• Make sure that any pieces do not enter the gap between

the rotor and the stator of the fan motor. Because the rotor is easy to be 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 transform the bracket by touching with the pliers.

2) Remove the fan blade assembly from the shaft of the fan motor by pulling fan retainer clip and rotating the fan blade with your hand.

3) Now, the fan blade will be free.

Page 29

R990K(W)

10 – 4

CAUTION:

• Do not use this removed fan blade again. Because the hole (for shaft) of it may become bigger than a standard

one.

7. Remove the two (2) screws and nuts holding the fan motor and thermal cut-out mounting angle from the fan duct.

8. Now, the fan motor is free.

2. INSTALLATION

1. Install the fan motor and thermal cut-out angle to the fan duct with the two (2) screws and nuts.

2. Install the fan blade assembly to the fan motor shaft according the following procedure.

1) Hold the center of the bracket which supports the shaft of the

fan motor on the flat table.

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

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

CAUTION:

• Do not hit the fan blade strongly when installed because

the bracket may be transformed.

• Make sure that the fan blade rotates smooth after

installed.

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

3. Install the fan duct to the air guide.

4. Install the chassis support to the oven cavity with three(3) screws.

5. Connect the wire leads to the fan motor and the thermal cut-out, referring to the pictorial diagram.

[14] CORD HOLDER REMOVAL

1. Remove the one (1) special screw holding the cord holder to the rear cabinet, using the special driver LHSTIX DLR4-100T.

2. Now, the cord holder is free.

NOTE: When securing or loosening the special screw, LHSTIX DLR4-

100T type screw driver should be used.

[15] POWER SUPPLY CORD REPLACEMENT

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the brown and blue wire leads of the power supply cord from the noise filter.

3. Remove the single (1) screw holding the green/yellow wire lead to the base plate.

4. Remove the power supply cord from the hole in the rear cabinet.

5. Now, the power supply cord is free.

2. REINSTALL

1. Insert the power supply cord into the hole of the rear cabinet.

2. Earth the green/yellow wire lead of the power supply cord to the bottom plate with the single (1) screw.

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

4. CARRY OUT 4R

CHECKS.

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

Noise filter

P ower s upply cord

Brownwire

Blue wire

Green/ Y ellow wire

Page 30

R990K(W)

10 – 5

[16] STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH REMOVAL

1. REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove control panel assembly, refer to “Control Panel Removal”.

3. Discharge high voltage capacitor.

4. Disconnect wire leads from each of the switches.

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

6. Remove latch hook assembly from oven flange.

7. Push downward on the one (1) stopper tabs holding each of the switches place.

8. Switches are free.At this time latch lever will be free, do not lose it.

2. REINSTALL

1. Re-install latch lever and each switch in its place, refer to Figure C-

2. Re-connect the wire leads to each switches and fuse holder.

Refer to the pictorial diagram.

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

4. Make sure that monitor switch is operating properly.

Refer to chapter “Test Procedure” and Adjustment procedure.

[17] STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH ADJUSTMENT

1. Adjustment

If those switches do not operate properly due to a misadjustment, the following adjustment should be made.

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

2. With the door closed, adjust the latch hook by moving it back and forth and then adjust the latch hook by moving it back and forth. In and out play of the door allowed by the latch hook should be less than 0.5 mm. The vertical position of the latch hook should be adjusted so that the lower latch switch and stop 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 and upper latch switch are pressed with the door closed.

3. Secure the screws with washers firmly.

4. Now, make sure all switches operations. If each switch has not been activated with the door closed, loose the screws holding the latch hook to the oven cavity front flange and adjust the latch hook position.

2. After adjustment, check the following.

1. The in and out play of the door remains less than 0.5mm at latched position.

2. The stop switch and lower latch switch interrupt the circuit before the door can be opened.

3. The upper latch switch contacts open when the door is opened.

4. The monitor switch contacts close when the door is opened.

5. Re-install the outer case and check for microwave leakage around the door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Figure C-1. Latch Switch Adjustments

[18] DOOR REPLACEMENT AND ADJUSTMENT

1. REPLACEMENT

1. 1.Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Remove turntable tray and roller stay from oven cavity.

4. Remove three (3) screws holding lower oven hinge.

5. Remove lower oven hinge from oven cavity bottom flange.

6. Remove door assembly from upper oven hinge on the oven.

7. Door assembly is now free.

NOTE: When individual parts are replaced, refer to “Door Disassem-

bly”.

8. On re-installing door, insert the upper oven hinge into the door hinge pin. Then while holding door in place.

9. Make sure door is parallel with oven face lines (left and upper side lines) and the door latch heads pass through the latch holes correctly.

10.Insert the lower oven hinge into oven cavity bottom flange and then engage the door hinge pin. Then secure the lower oven hinge firmly with three (3) mounting screws.

NOTE: After any service to the door;

1) Make sure that the upper and lower latch switches, the monitor switch and the stop 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.

2. DOOR ADJUSTMENT

The door is adjusted by keeping the screws of each hinge loose. The lower oven hinge can be loosened.

After adjustment, make sure of the following:

LATCH HOOK

LATCH HEADS

STOP SWITCH

MONITOR SWITCH

LOWER LATCH SWITCH

SWITCH LEVER

OPEN LEVER

DOOR OPEN BUTTON

UPPER LATCH SWITCH

Page 31

R990K(W)

10 – 6

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

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

3. The door is positioned with its face depressed toward the cavity face plate.

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

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

tronic seal preventing the leakage of microwave energy from the oven cavity during the cook cycle. This function does not require that the door be air-tight, moisture (condensation)-tight or light-tight. Therefore, the occasional appearance of moisture, light or the sensing of gentle warm air movement around the oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from the oven cavity. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.

[19] DOOR DISASSEMBLY

Remove door assembly, referring to “Door Replacement”.

Replacement of door components are as follows:

CHOKE COVER

1. Place door assembly on a soft cloth with latches facing up.

NOTE: As the engaging part of choke cover and door panel are pro-

vided at several places, do not force any particular part.

2. Insert an putty knife (thickness of about 0.5mm) into the gap between the choke cover and corner portion of door panel as shown Figure C-2 to free engaging parts.

3. Lift up choke cover.

4. Now choke cover is free from door panel.

Figure C-2. Door Disassembly

DOOR PANEL

5. Remove the eleven (11) screws holding the door panel to the door frame.

NOTE: The one (1) screw of the eleven (11) screws also holds the

earth terminal of the door decoration to the door frame.

6. Remove the door panel from the door frame. Now the door panel is free.

DOOR GLASS

7. Remove the two (2) screws holding the thermal plate U to the door frame.

8. Remove the two (2) screws holding the thermal plate R to the door frame.

9. Remove the thermal plate U and the thermal plate R from the door frame.

10.Slide the door glass upward.

11.Release the lower edge of the door glass from the door frame.

12.Release the upper edge of the door glass from the door frame.

13.Remove the door glass from the door frame. Now the door glass is free.

DOOR DECORATION AND DOOR FRAME

14.Straighten all tabs of the door decorations U and L.

15.Remove the door decorations U and L from the door frame.

16.Now the door decorations U and L and door frame are free.

RE-INSTALL

LOWER OV E N HINGE

UPPER OVEN HINGE

DOOR ASS E MBLY

LATCH HEADS

CHOKE COVER

PUTTY KNIFE

FRONT

INS IDE

Upper

Lower

Bent

Door Panel

Choke cover

1BENT

2LIFTUP

Page 32

R990K(W)

11 – 1

R990K(W)

Service Manual

CHAPTER 11. 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 33

R990K(W)

12 – 1

R990K(W)

Service Manual

CHAPTER 12. CIRCUIT DIAGRAMS

[1] Oven Schematic

Figure O-1 Oven Schematic-OFF Condition

Figure O-2. Oven Schematic-High or Easy Defrost or Reheat Sensor Cooking 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 PAD TOUCHED.

THERMAL

CUT-OUT

150¡C (CONV.)

NOISE FILTER

MONITOR SWITCH

LOWER LATCH SWITCH

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER SWITCH

THERMISTOR

STOP SWITCH

AH SENSOR

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0022μ/AC250V

0.22μ/AC250V

0.0022μ/AC250V

NOISE SUPPRESSION COIL

CONVECTION

HEATER

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER

CAPACITOR

1.13μ AC 2100V

RY4

RY5

RY6

RY1

UPPER LATCH SWITCH

TEMPERATURE FUSE 150¡C (MAGNETRON)

THERMAL CUT-OUT 95¡C (FAN)

THERMAL CUT-OUT 145¡C (MAGNETRON)

230-240V 50Hz

COM. (RY1)

E-5E-4E-3E-2E-1

F-3 F-2

F-1

RY3

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

A-9

A-7

FUSE F10A

RY2

TTM

H.V.FUSE

0.75A

NOTE: " " indicates components with potentials above 250V

THERMAL

CUT-OUT

150¡C (CONV.)

NOISE FILTER

MONITOR SWITCH

LOWER LATCH SWITCH

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER SWITCH

THERMISTOR

STOP SWITCH

AH SENSOR

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0022μ/AC250V

0.22μ/AC250V

0.0022μ/AC250V

NOISE SUPPRESSION COIL

CONVECTION

HEATER

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER

CAPACITOR

1.13μ AC 2100V

RY4

RY5

RY6

RY1

UPPER LATCH SWITCH

TEMPERATURE FUSE 150¡C (MAGNETRON)

THERMAL CUT-OUT 95¡C (FAN)

THERMAL CUT-OUT 145¡C (MAGNETRON)

230-240V 50Hz

COM. (RY1)

E-5E-4E-3E-2E-1

F-3 F-2

F-1

RY3

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

A-9

A-7

FUSE F10A

RY2

TTM

H.V.FUSE

0.75A

Page 34

R990K(W)

12 – 2

Figure O-3. Oven Schematic-Automatic Mix Cooking Condition

Figure O-4. Oven Schematic-Convection Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. MIX COOKING PAD TOUCHED.

3. COOKING TIME PROGRAMMED.

4. START PAD TOUCHED.

5. RY2 AND RY3 WILL ALTERNATELY CLOSED DURING COOK CYCLE.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CONVECTION PAD TOUCHED.

3. DESIRED TEMP. PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. START PAD TOUCHED.

THERMAL

CUT-OUT

150¡C (CONV.)

NOISE FILTER

MONITOR SWITCH

LOWER LATCH SWITCH

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER SWITCH

THERMISTOR

STOP SWITCH

AH SENSOR

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0022μ/AC250V

0.22μ/AC250V

0.0022μ/AC250V

NOISE SUPPRESSION COIL

CONVECTION

HEATER

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER

CAPACITOR

1.13μ AC 2100V

RY4

RY5

RY6

RY1

UPPER LATCH SWITCH

TEMPERATURE FUSE 150¡C (MAGNETRON)

THERMAL CUT-OUT 95¡C (FAN)

THERMAL CUT-OUT 145¡C (MAGNETRON)

230-240V 50Hz

COM. (RY1)

E-5E-4E-3E-2E-1

F-3 F-2

F-1

RY3

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

A-9

A-7

FUSE F10A

RY2

TTM

H.V.FUSE

0.75A

NOTE: " " indicates components with potentials above 250V

THERMAL

CUT-OUT

150¡C (CONV.)

NOISE FILTER

MONITOR SWITCH

LOWER LATCH SWITCH

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER SWITCH

THERMISTOR

STOP SWITCH

AH SENSOR

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0022μ/AC250V

0.22μ/AC250V

0.0022μ/AC250V

NOISE SUPPRESSION COIL

CONVECTION

HEATER

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER

CAPACITOR

1.13μ AC 2100V

RY4

RY5

RY6

RY1

UPPER LATCH SWITCH

TEMPERATURE FUSE 150¡C (MAGNETRON)

THERMAL CUT-OUT 95¡C (FAN)

THERMAL CUT-OUT 145¡C (MAGNETRON)

230-240V 50Hz

COM. (RY1)

E-5E-4E-3E-2E-1

F-3 F-2

F-1

RY3

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

A-9

A-7

FUSE F10A

RY2

TTM

H.V.FUSE

0.75A

Page 35

R990K(W)

12 – 3

[2] Pictorial Diagram (Figure S-1)

Figure S-1. Pictorial Diagram

HV. RECTIFIER

ORG

H.V. FUSE

MAGNETRON

RED

GRY

HIGH VOLTAGE COMPONENTS

TURNTABLE

MOTOR

GRY

BRN

GRY

DAMPER

MOTOR

DAMPER

SWITCH

FAN

MOTOR

THERMAL

CUT-OUT

150ûC (CONV.)

ORG

OVEN

LAMP

BLACK

DOT

STOP SWITCH

RED

654

123

PNK

RED

GRN

CN-F

CN-E

PPL

BRN

RED

CN-A

N.O.

COM

RED

BRN

CN-E

ORG

RED

UPPER

LATCH

SWITCH

CONTROL PANEL

TEMP.

FUSE

(MG.)

150ûC

CONVECTION

HEATER

THERMISTOR

HIGH VOLTAGE

CAPACITOR

POWER

TRANSFORMER

CONVECTION

MOTOR

GRN

COM

N.O.

GRY

WHT

GRY

PPLWHT

WHT

RED

WHT

N.O.

COM

PNK

RED

GRY

RED

BRN

COM

N.O.

ORG

PNK

LOWER

LATCH

SWITCH

MONITOR

SWITCH

COM

N.C.

GRY

ORG

BLK

AH SENSOR

RED

WHT

123

CN-F

RY3

RY2

CN-A

THERMAL CUT-OUT

95ûC (FAN MOTOR)

RED

BLK

RED

GRY

RED

WHT

RED

RY1

RY6

231

357

N.O.

COM

RY3(N.O.)

RY3(COM.)

RY2(N.O.)

BRN

RY2(COM.)

BRN

RED

RY1(N.O.)

PNK

BLK

RY1(COM.)

WHT

NOTE:

Neutral (WHT) wire must be

connected to the terminal

with black dot on the oven

light socket.

GRN

GRY

NOTE: ORANGE WIRE (LIVE) MUST BE

CONNECTED TO THE CABINET

SIDE TERMINAL OF POWER

TRANSFORMER

POWER

SUPPLY

CORD

WHT

RED

BLU

BRN

G-Y

NOISE FILTER UNIT

FUSE

Page 36

R990K(W)

12 – 4

[3] Control Unit Circuit (Figure S-2)

Figure S-2. Control Unit Circuit

E1 E2 E5 E6 E3 E4 F1 F2 F3

G5 G6 G7 G8 G9 G10 G11 G12

COM

VRS1

C1 0.1μ/50v

C22 0.1μ/50v

C3 0.1μ/50v

C5 0.1μ/50v

C9 0.01μ/50v

C4 10μ/35v

C6 10μ/35v

C2 1000μ/35v

ZD2

ZD3

C11

22μ

/25v

ZD4

470 1/2w

HZ16-1

HZ5C2

HZ4A2

R7 4.7k

(J1)

D20D21D22D24

C20 10μ/35v

C21 0.1μ/50v

R30 15k

R50 15k

R63 100F

R64 2.2kF

R70 3.3k

IC1 IZA840DR

R71 3.3k

R72 3.3k

R73 3.3k

R74

3.3k

R75

3.3k

R76

3.3k

R79

3.3k

R80

3.3k

R81

3.3k

R77

3.3k

R78

3.3k

D70

D71

D72

D73

D74

D75

D76

D77

(J2)

(J4)

(J6)

(J3)

(J5)

(J7)

R100 330 1w

7G 28

6G 27

5G 26

4G 25

3G 24

2G 23

1G 22

P16

P15

P14

P13

P12

P11

P10

P9 12

P8 11

P7 10

P6 9

R91

R92

R93

100k

D25D26

D31

D23

SP40

R40 3.3k

R8 4.7k

10G471K

RY4

RY5

DAMPER

MOTOR

AC230-240V

50Hz

CONV.

MOTOR

FAN

MOTOR

POWER

TRANSFORMER

HEATING

ELEMENT

STOP

SWITCH

DAMPER

SWITCH

OVEN

THERMISTOR

AH SENSOR

OVEN LAMP

TURNTABLE

MOTOR

RY6

RY2

D30

RY3

RY1

R31 4.7k

R51 4.7k

R62 75kF

CF1 4.19MHz

C70 330pF x 4

(A) (B) (C)

C30 C50 C60

2SB1238

DTA123ES

KRA101M

Q90

KRA101M

Q40

KRA101M

Q21

KRA101M

Q22

KRA101M

Q24

KRA101M

Q25

KRA101M

Q23

KRA101M

Q26

KRC243M

Q20

KRA101M

R10 18 1w

CONTROL UNIT

C10 0.1μ/50v

(VP)

FF8G

31, 32

1, 2

MIX CONV

DEFROST

SENSOR

COOK KG HELP

R90 100k

IC2 IZA495DR

FLUORESCENT DISPLAY TUBE

NOTE : IF NOT SPECIFIED. 1/4w ± 5%

: IF NOT SPECIFIED. 0.01μ/16v

: IF NOT SPECIFIED. 1SS270A

R11181w

R3 330 1/2w

D1-4 : 1N4002

R4 750 1/2w

VREF

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

P55

P54

P53

P52

P51

P50

P47

P46

P45

P44

P43

P30

P31

P32

P33

P34

P35

P36

P37

P00

P01

P02

P03

P04

P05

P06

P07

P10

P11

P12

P13

P14

P15

P16

P17

P20

P21

P22

P23

P24

P25

P26

P27

P42

P40

RST

XCIN

XCOUT

XIN

XOUT

VSS

INT1

VCC 1

32 33

VEE

AVSS

STOP

CLEAR

MULTI

COOK

REHEAT

SENSOR

POWER

LEVEL

PREHEAT

HELP

KEY UNIT

180ºC 200ºC 220ºC 230ºC 250ºC

67890

40ºC 70ºC 130ºC 150ºC 160ºC

12345

EASY

DEFROST

INSTANT COOK

START

LOW MIX

CONVEC HIGH MIX

GRILL

LESS

CLOCK

MEMORY

REHEAT

PIE

FROZEN

VEGETABLES

FRESH

VEGETABLES

DESSERTS

JACKET

POTATO

CASSEROLES

Page 37

R990K(W)

12 – 5

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

Figure S-3. Printed Wiring Board

654321

1357 9

45 78

33 64

CONV HEAT E R

COM

RED BRN

ORG

BLK

PINK R ED (BRN

RED)

D25

RY3

RY2

RY1

RY5

RY4

RY6

C11

R10

R11

D31 D30

D24

D23

Q40

Q25

Q24

Q21

Q20

ZD3

ZD4

10 11 12

(J7)

(J2) (J4)

(J6)

(J5)

(J3)

C10

(C81)

(C80)

(C45)

(R47)

(C46)

(C47)

(R48)

(R49)

(CN - D)

(CN - G)

CN - G

CN - F

CN - E

(ONL Y 9X58PJ )

C21

C22 C1

C60

C50

C30

(R45)

R91

R92

R93

R64

R80 R81

R73

D70 D71 D72 D73 D74 D75 D76 D77

R72 R71 R70

R79

R78

R77

R76

R75

R74

R86(J8)

R90

R100

R40

DAMP

DOOR

OVEN

TEMP

R50

R51

R31

R30

POWER TR ANS

POWER

OL TTM

R62

C20

CN - A

ZD2

Q23

Q26

Q22

R63

D26

D21

D20

D22

VRS1

DAMP M C O NV M FAN M PO W E R

(J1)

S1 S2

(R46)

IC1

IC2

IC3

(R85)

(CF 1)

(ONLY

PHR)

CF1

C70

Q90

DIP

Page 38

R990K(W)

12 – 6

MEMO

Page 39

PARTS LIST

SHARP CORPORATION

CONTENTS

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

R990K(W)

CONVECTION

MICROWAVE OVEN

MODELS

R-990K(S) R-990K(W)

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.

[1] OVEN PARTS

[2] DOOR AND CONTROL

PANEL PARTS

[3] OTHER

 INDEX

4-3 TURNTABLE TRAY

6-7 OPERATION

MANUAL

6-3 COOK BOOK

4-2 TURNTABLE SUPPORT

TRAY PACKING FOAM

SPADPA198WRE0

DOOR PROTECTION SHEET

SPADPA178WRE0

MICROWAVE OVEN

TOP PAD ASSEMBLY

FPADBA362WRK0

PLASTIC BAG

SSAKHA012WRE0

TRAY HOLDER

(SPADFA348WRE0)

BOTTOM PAD ASSEMBLY

FPADBA363WRK0

Not replaceable items.

PACKING CASE

SPAKCE322WREZ [R-990K(S)]

SPAKCE323WREZ [R-990K(W)]

Page 40

R990K(W)

[1] OVEN PARTS

1-13

7-18

2-1

7-18

7-16

2-6

7-4

7-16

7-4

7-24

1-22

7-24

4-32

7-19

4-33

4-41

4-15

7-26

1-16

7-10

7-17

7-3

4-8

4-4

4-10

7-1

4-36

4-12

1-12

7-21

7-28

7-27

4-9

7-11

1-2

7-21

7-1

7-14

7-4

4-10

1-17

4-30

4-7

7-11

4-29

4-1

4-22

4-23

7-11

6-9

7-12

7-25

4-3

4-2

7-19

1-1

7-16

7-1

1-8

1-10

4-21

1-3

7-19

4-26

4-27

4-18

4-20

7-9

7-16

4-19

1-9

1-14

7-17

4-17

7-23

7-6

1-21

4-40

4-14

7-18

2-4

2-3-2

2-3-1

7-22

4-28

7-7

1-23

4-16

4-24

7-20

1-10

4-38

4-6

7-15

4-38

4-39

7-2

6-8

7-2

4-34

4-25

4-13

6-4

7-16

2-3

1-11

7-22

7-19

4-5

1-3

1-20

4-31

7-1

2-5

7-13

7-5

4-11

7-2

2-2

2-9

2-8

7-8

4-35

7-8

TO OVEN

BASE PLATE

1-19

7-17

1-18

4-42

1-5

4-14

7-18

1-15

1-4

7-4

1-6

4-37

1-7

2-7

1-9

4-43

Page 41

R990K(W)

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PAR T

RANK

DESCRIPTION

[1] OVEN PARTS

ELECTRICAL PARTS

1-1 FH-DZA053WRK0 AP

High voltage rectifier assembly

1-2 FH-HZA041WRE0 AN

Thermistor assembly

1-3 QACC-A141WRZZ AR

Power supply cord

1-3 QACC-A155WRZZ --

Power supply cord (Interchnageable) (for production use)

1-4 QFS-CA026WRZZ AH

Fuse F10A

1-5 QFS-TA013WRE0 AG

Temperature fuse 150C (Magnetron)

1-5 RTHM-A080WRE0 AP

Thermal cut-out 145C (Magnetron) (Interchangeable)

1-5 RTHM-A112WRE0 AG

Thermal cut-out 145C (Magnetron) (Interchangeable)

1-5 RTHM-A120WRE0 AH

Thermal cut-out 145C (Magnetron) (Interchangeable)

1-6 FPWBFA413WRKZ AW

Noise filter

1-7 QSOCLA024WRE0 AH

Oven lamp socket

1-7 QSOCLA022WRE0 AG

Oven lamp socket (Interchangeable)

1-8 QSW-MA086WRE0 AF

Monitor switch

1-8 QSW-MA132WRE0 AH

Monitor switch

1-9 QSW-MA085WRE0 AF

Stop switch and Damper switch

1-9 QSW-MA131WRE0 AG

Stop switch and Damper switch

1-10 QSW-MA085WRE0 AF

Upper and lower latch switches

1-10 QSW-MA131WRE0 AG

Upper and lower latch switches

1-11 RC-QZA229WRE0 AU

High voltage capacitor

1-11 RC-QZA292WRZZ --

High voltage capacitor (Interchnageable) (for production use)

1-12 RHET-A139WRE0 AY

Convection heater

1-13 RLMPTA078WRE0 AL

Oven lamp

1-13 RLMPTA069WRE0 AK

Oven lamp (Interchangeable)

1-13 RLMPTA029WRE0 AL

Oven lamp (Interchangeable)

1-14 RMOTDA191WRE0 AS

Damper motor

1-14 RMOTDA269WRZZ --

Damper motor (Interchangeable) for production use

1-15 RMOTDA223WRE0 AZ

Turntable motor

1-16 RMOTEA303WRE0 AX

Cooling fan motor

1-17 RMOTEA284WRE0 AZ

Convection motor

1-18 QFS-IA002WRE0 AQ

High voltage fuse 0.75A

1-19 RTHM-A121WRE0 AK

Thermal cut-out 150C (Conv.)

1-19 RTHM-A085WRE0 AL

Thermal cut-out 150C (Conv.) (Interchnageable)

1-19 RTHM-A099WRE0 --

Thermal cut-out 150C (Conv.) (Interchnageable)for

1-20 RTHM-A117WRE0 AK

Thermal cut-out 95C (Fan)

1-20 RTHM-A079WRE0 AL

Thermal cut-out 95C (Fan) (Interchangeable)

1-20 RTHM-A111WRE0 AG

Thermal cut-out 95C (Fan) (Interchangeable)

1-21 RTRN-A545WRE0 BS

Power transformer

1-22 RV-MZA222WRE0 BN

Magnetron

1-23 FDTCTA185WRK0 AY

AH sensor assembly

CABINET PARTS

2-1 GCABUA721WRP0 BF

Outer case cabinet [R-990(W)]

2-1 GCABUA987WRPZ BK

Outer case cabinet [R-990(S)]

2-2 MLEVPA231WRF0 AE

Switch lever

2-3 FDAI-A200WRY0 AR

Base cabinet

2-3-1 GCOVHA156WRP0 AB

Turntable motor cover

2-3-2 XHTS740P08RV0 AG

Screw; 4mm x 8mm

2-4 GLEGPA019WRE0 AD

Foot

2-5 GCABDA096WRW0 AW

Rear cabinet

2-6 LHLDKA009WRF0 AG

Cord holder

2-7 LBNDKA036WRP0 AG

Capacitor holder

2-8 FHNG-A092WRM0 AF

Oven hinge (Lower)

2-9 PHOK-A137WRFZ AM

Latch hook

OVEN PARTS

4-1 FOVN-A314WRY0 BN

Oven cavity assembly

4-2 FROLPA072WRK0 AL

Turntable support

4-3 NTNT-A019WRH0 AT

Turntable tray

4-4 FBRGMA002WRE0 AQ

Bearing assembly

4-5 PREFHA028WRW0 AR

Thermal protection plate (left)

4-6 LANGTA196WRW0 AD

Bearing mounting plate

4-7 LBNDK0054WRE0 AB

Heater element holder

4-8 LFIX-A013WRW0 AB

Bearing holder plate

4-9 NFANMA019WRW0 AE

Convection fan

4-10 NPLYBA025WRF0 AC

Pulley (F)

4-11 FDUC-A279WRK0 AT

Heater duct assembly

4-12 PFPF-A138WRE0 AK

Thermal protection sheet (left)

4-13 LANGKA723WRP0 AE

Glass mounting plate

Page 42

R990K(W)

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PAR T

RANK

DESCRIPTION

4-14 PCUSUA167WRP0 AF

Cushion

4-15 PCUSUA424WRP0 AG

Cushion

4-16 FDUC-A322WRW0 BB

Steam duct assembly

4-17 MCAMPA030WRF0 AC

Damper cam

4-18 NSFTTA114WRE0 AB

Damper shaft

4-19 FFTA-A034WRK0 AM

Damper door assly

4-20 PDUC-A269WRW0 AK

Damper duct

4-21 PCUSGA410WRP0 AD

Cushion

4-22 NCPL-A021WRF0 AE

Turntable coupling

4-23 PCOVPA301WRE0 AE

Waveguide cover

4-24 PCUSUA197WRP0 AD

Cushion

4-25 PGLSPA455WRE0 AD

Light glass

4-26 PFPF-A139WRE0 AF

Thermal protection sheet (Right)

4-27 PREFHA053WRW0 AP

Thermal protection plate (Right)

4-28 PSKR-A153WRW0 AK

Air guide (Bottom)

4-29 PSKR-A323WRW0 AF

Air guide (Right)

4-30 LANGQA407WRW0 AG

Convection motor mounting plate

4-31 LANGQA369WRP0 AC

Thermal cut-out mounting angle

4-32 NFANJA020WRE0 AE

Fan blade

4-33 PDUC-A882WRFZ AQ

Cooling fan duct

4-34 LANGFA089WRW0 AE

Chassis support

4-35 MHNG-A165WRM0 AE

Oven hinge (Upper)

4-36 NBLTKA005WRE0 AF

Convection fan belt

4-37 LANGQA474WRP0 AG

Noise unit angle

4-38 PCUSUA196WRP0 AD

Cushion

4-39 PCUSUA425WRP0 AG

Damper duct cushion

4-40 PCUSGA236WRP0 AC

Cushion

4-41 PSKR-A171WRW0 AE

Magnetron air guide

4-42 PFPF-A064WRE0 AF

Thermal protection sheet

4-43 PCUSGA353WRP0 AH

Cushion

MISCELLANEOUS

6-4 FW-VZB635WRE0 AT

Thermistor harness

6-8 TCAUHA214WRR0 AF

K caution label

6-9 TLABNA226WRR0 AE

Menu label

SCREWS, NUTS AND WASHERS

7-1 XOTWW40P10000 AA

Screw; 4mm x 10mm

7-2 XOTS740P12000 AA

Screw; 4mm x 12mm

7-3 XCTWW40P08000 AA

Screw; 4mm x 8mm

7-4 XHTS740P08RV0 AG

Screw; 4mm x 8mm

7-5 LX-CZ0052WRE0 AA

Special screw

7-6 XWVS760-07000 AC

Washer; 6mm x 0.7 mm

7-7 LX-WZA004WRE0 AA

Washer

7-8 LX-CZA074WRE0 AC

Special screw

7-9 XBPS730P14K00 AC

Screw; 3mm x 14mm

7-10 XBPS740P25000 AC

Screw; 4mm x 25mm

7-11 XBTWW40P06000 AA

Screw; 4mm x 6mm

7-12 XCTS740P08000 AC

Screw; 4mm x 8mm

7-13 LX-CZA060WRE0 AA

Special screw

7-14 XBPS740P06KS0 AD

Screw; 4mm x 6mm

7-15 LX-WZA022WRE0 AB

Washer

7-16 XCPS740P08000 AB

Screw; 4mm x 8mm

7-17 XCPS730P06000 AC

Screw; 3mm x 6mm

7-18 XOTS740P12RV0 AD

Screw; 4mm x 12mm

7-19 XHPS740P08K00 AB

Screw; 4mm x 8mm

7-20 LX-CZA030WRE0 AC

Special screw

7-21 XCBWW30P06000 AA

Screw; 3mm x 6mm

7-22 XFPS740P08000 AB

Screw; 4mm x 8mm

7-23 XFPS760P14JS0 AE

Screw; 6mm x 14mm

7-24 XOTS740P12000 AA

Screw; 4mm x 12mm

7-25 XHPS730P08000 AC

Screw; 3mm x 8mm

7-26 XNES740-32000 AC

Nut; 4mm x 3.2mm

7-27 XNEUW40-32000 AA

Nut; 4mm x 3.2mm

7-28 XWSUW40-10000 AA

Washer; 4mm x 1 mm

[1] OVEN PARTS

Page 43

R990K(W)

[2] DOOR AND CONTROL PANEL PARTS

Actual wire harness may be different than illustration.

6-4

6-1

6-5

6-7

6-2

6-3

6-6

3-5

3-4

3-7

3-3

3-6

3-1E

3-1F

3-1

3-8

3-6

7-18

5-3

5-15

5-1

6-10

3-7

5-12

5-11

5-7

5-11

5-2

5-8

5-6

5-10

5-5

5-4

5-9

5-13

3-2

3-2-3

3-2-2

3-2-4

5-14

3-2-1

3-2-7

3-2-6

3-2-5

Page 44

R990K(W)

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PAR T

RANK

DESCRIPTION

[2] DOOR AND CONTROL PANEL PARTS

CONTROL PANEL PARTS

3-1 DPWBFB724WRU0 BU

Control unit (New Zealand only)

3-1E RV-KXA077DRE0 AY

Fluorescent display tube

3-1F PCUSGA381WRP0 AG

Cushion

3-2 DPNLCB960WRKZ BG

Control panel frame with key unit [R-990K(W)]

3-2 DPNLCB958WRKZ BF

Control panel frame with key unit [R-990K(S)]

3-2-1 FUNTKB163WREZ AV

Key unit [R-990K(W)]

3-2-2 JBTN-B342WRFZ AG

Open button

3-2-3 MSPRCA050WRE0 AB

Open button spring

3-2-4 GMADIA150WRFZ AH

Display window

3-2-5 GCOVAA369WRPZ AR

Button decoration [R-990K(W)]

3-2-5 GCOVAA365WRPZ AR

Button decoration [R-990K(S)]

3-2-6 GCOVAA370WRPZ AS

C/P decoration U [R-990K(W)]

3-2-6 GCOVAA366WRPZ AS

C/P decoration U [R-990K(S)]

3-2-7 GCOVAA371WRPZ AS

C/P decoration L [R-990K(W)]

3-2-7 GCOVAA362WRPZ AS

C/P decoration L [R-990K(S)]

3-3 LANGTA340WRW0 AK

Control panel back plate

3-4 MLEVFA057WRW0 AE

Open lever

3-5 NSFTTA042WRE0 AE

Open shaft

3-6 XEPS730P10XS0 AA

Screw ; control unit mtg.

3-7 XCPS740P12000 AC

Screw ; control panel back plate mtg.

3-8 XOTS740P12RV0 AD

Screw ; 4mm x 12mm

7-18 XOTS740P12RV0 AD

Screw; 4mm x 12mm

DOOR PARTS

5 CDORFB035WRKZ BU

Door panel assembly complete [R-990K(W)]

5 CDORFB034WRKZ BU

Door panel assembly complete [R-990K(S)]

5-1 DDORFA820WRY0 BD

Door panel

5-2 PGLSPA660WREZ AX

Door glass

5-3 GCOVHA155WRF0 AP

Choke cover

5-4 GWAKPB014WRFZ BD

Door frame

5-5 GCOVAA372WRPZ BA

Door decoration U [R-990K(W)]

5-5 GCOVAA354WRPZ BA

Door decoration U [R-990K(S)]

5-6 LANGKA851WRT0 AF

Latch angle

5-7 LSTPPA169WRF0 AH

Latch head

5-8 MSPRTA192WRE0 AC

Latch head spring

5-9 LANGKB163WRWZ AK

Thermal plate U

5-10 LANGKB164WRWZ AK

Thermal plate R

5-11 XCPS740P08000 AB

Screw; 4mm x 8mm

5-12 XEBS730P06000 AC

Screw; 3mm x 6mm

5-13 PCUSGA537WRPZ AD

Cushion

5-14 GCOVAA373WRPZ BA

Door decoration L [R-990K(W)]

5-14 GCOVAA355WRPZ BA

Door decoration L [R-990K(S)]

5-15 XEBS730P08000 AA

Screw; 4mm x 8mm

MISCELLANEOUS

6-1 FAMI-A088WRM0 AW

Low rack (Broiling trivet)

6-2 FAMI-A087WRM0 AW

High rack (Baking rack)

6-3 TCADCA546WRR0 AZ

Cook book

6-4 FW-VZB635WRE0 AT

Thermistor harness

6-5 FW-VZC084WREZ AX

Main wire harness

6-6 TINSEB113WRRZ AM

Operation manual

6-7 TCAUSA008WRRZ AK

High temperature caution

6-10 TCAUHA343WRRZ AF

Micro caution

[3] OTHER

3-1A QCNCMA227DRE0 AC

5-pin connector(A)

3-1B QCNCMA267DRE0 AC

6-pin connector(E)

3-1C QCNCMA237DRE0 AD

3-pin connector(F)

3-1D QCNCWA057DRE0 AF

12-pin connector(G)

C1 RC-KZA087DRE0 AA

Capacitor 0.1uF 50V

C2 VCEAB31VW108M AF

Capacitor 1000uF 35V

C3 RC-KZA087DRE0 AA

Capacitor 0.1uF 50V

C4 VCEAB31VW106M AA

Capacitor 10uF 35V

C5 RC-KZA087DRE0 AA

Capacitor 0.1uF 50V

C6 VCEAB31VW106M AA

Capacitor 10uF 35V

C7-8 VCKYD11CY103N AA

Capacitor 0.01uF 16V

C9 VCTYF31HF103Z AB

Capacitor 0.01uF 50V

C10 RC-KZA087DRE0 AA

Capacitor 0.1uF 50V

C11 VCEAB31EW226M AA

Capacitor 22uF 25V

Page 45

R990K(W)

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PAR T

RANK

DESCRIPTION

C20 VCEAB31VW106M AA

Capacitor 10uF 35V

C21 VCEAB31HW104M AM

Capacitor 0.1uF 50V

C22 RC-KZA087DRE0 AA

Capacitor 0.1uF 50V

C30 VCKYD11CY103N AA

Capacitor 0.01uF 16V

C50 VCKYD11CY103N AA

Capacitor 0.01uF 16V

C60 VCKYD11CY103N AA

Capacitor 0.01uF 16V

C70 RMPTEA009DRE0 AE

Capacitor array 330pF x 4

CF1 RCRS-A035DRE0 AG

Ceramic resonator (CST4.19MGW)

D1-4 RH-DZA006PRE0 AD

Diode (1N4002)

D7 VHD1SS270A/-1 AA

Diode (1SS270ATA)

D20-26 VHD1SS270A/-1 AA

Diode (1SS270ATA)

D30-31 VHD1SS270A/-1 AA

Diode (1SS270ATA)

D70-77 VHD1SS270A/-1 AA

Diode (1SS270ATA)

IC1 RH-IZA840DRE0 AW

LSI

IC2 RH-IZA495DRE0 AL

Q1 VS2SB1238//-3 AA

Transistor (2SB1238)

Q3 VSKRA101M//-3 AB

Transistor (KRA101M)

Q4 VSDTA123ES/-3 AA

Transistor (DTA123E)

Q20-23 VSKRA101M//-3 AB

Transistor (KRA101M)

Q24-25 VSKRA223M//-3 AB

Transistor (KRA223M)

Q26 VSKRC243M//-3 AB

Transistor (KRC243M)

Q40 VSKRA101M//-3 AB

Transistor (KRA101M)

Q90 VSKRA101M//-3 AB

Transistor (KRA101M)

R2 VRD-B12HF471J AA

Resistor 470 ohm 1/2W

R3 VRD-B12HF331J AA

Resistor 330 ohm 1/2W

R4 VRD-B12HF751J AA

Resistor 750 ohm 1/2W

R7-8 VRD-B12EF472J AA

Resistor 4.7k ohm 1/4W

R10-11 VRS-B13AA180J AA

Resistor 18 ohm 1W

R30 VRD-B12EF153J AA

Resistor 15k ohm 1/4W

R31 VRD-B12EF472J AA

Resistor 4.7k ohm 1/4W

R40 VRD-B12EF332J AA

Resistor 3.3k ohm 1/4W

R50 VRD-B12EF153J AA

Resistor 15k ohm 1/4W

R51 VRD-B12EF472J AA

Resistor 4.7k ohm 1/4W

R62 VRN-B12EK753F AA

Resistor 75k ohm(F) 1/4W

R63 VRN-B12EK101F AA

Resistor 100 ohm(F) 1/4W

R64 VRN-B12EK222F AA

Resistor 2.2k ohm(F) 1/4W

R70-81 VRD-B12EF332J AA

Resistor 3.3k ohm 1/4W

R90-93 VRD-B12EF104J AA

Resistor 100k ohm 1/4W

R100 VRS-B13AA331J AA

Resistor 330 ohm 1W

RY1-3 RRLY-A083DRE0 AK

Relay (OMIF-S-118LM)

RY4-6 RRLY-A078DRE0 AG

Relay (OJ-SS-118LM)

SP40 RALM-A014DRE0 AG

Buzzer (PKM22EPT)

T1 RTRNPA089DRE0 AU

Transformer

VRS1 RH-VZA032DRE0 AE

Varistor (10G471K)

ZD2 VHEHZ161///-1 AA

Zener diode (HZ16-1)

ZD3 VHEHZ5C2///-1 AA

Zener diode (HZ5C-2)

ZD4 VHEHZ4A2///-1 AA

Zener diode (HZ4A2)

[3] OTHER

Page 46

R990K(W)

INDEX

PARTS CODE No.

PRICE RANK

NEW

MARK

PART

RANK

[ C ]

CDORFB034WRKZ 2-5 BU

CDORFB035WRKZ 2-5 BU

[ D ]

DDORFA820WRY0 2-5-1 BD

DPNLCB958WRKZ 2-3-2 BF

DPNLCB960WRKZ 2-3-2 BG

DPWBFB724WRU0 2-3-1 BU

[ F ]

FAMI-A087WRM0 2-6-2 AW

FAMI-A088WRM0 2-6-1 AW

FBRGMA002WRE0 1-4-4 AQ

FDAI-A200WRY0 1-2-3 AR

FDTCTA185WRK0 1-1-23 AY

FDUC-A279WRK0 1-4-11 AT

FDUC-A322WRW0 1-4-16 BB

FFTA-A034WRK0 1-4-19 AM

FH-DZA053WRK0 1-1-1 AP

FH-HZA041WRE0 1-1-2 AN

FHNG-A092WRM0 1-2-8 AF

FOVN-A314WRY0 1-4-1 BN

FPWBFA413WRKZ 1-1-6 AW

FROLPA072WRK0 1-4-2 AL

FUNTKB163WREZ 2-3-2-1 AV

FW-VZB635WRE0 1-6-4 AT

" 2-6-4 AT

FW-VZC084WREZ 2-6-5 AX

[ G ]

GCABDA096WRW0 1-2-5 AW

GCABUA721WRP0 1-2-1 BF

GCABUA987WRPZ 1-2-1 BK

GCOVAA354WRPZ 2-5-5 BA

GCOVAA355WRPZ 2-5-14 BA

GCOVAA362WRPZ 2-3-2-7 AS

GCOVAA365WRPZ 2-3-2-5 AR

GCOVAA366WRPZ 2-3-2-6 AS

GCOVAA369WRPZ 2-3-2-5 AR

GCOVAA370WRPZ 2-3-2-6 AS

GCOVAA371WRPZ 2-3-2-7 AS

GCOVAA372WRPZ 2-5-5 BA

GCOVAA373WRPZ 2-5-14 BA

GCOVHA155WRF0 2-5-3 AP

GCOVHA156WRP0 1-2-3-1 AB

GLEGPA019WRE0 1-2-4 AD

GMADIA150WRFZ 2-3-2-4 AH

GWAKPB014WRFZ 2-5-4 BD

[ J ]

JBTN-B342WRFZ 2-3-2-2 AG

[ L ]

LANGFA089WRW0 1-4-34 AE

LANGKA723WRP0 1-4-13 AE

LANGKA851WRT0 2-5-6 AF

LANGKB163WRWZ 2-5-9 AK

LANGKB164WRWZ 2-5-10 AK

LANGQA369WRP0 1-4-31 A C

LANGQA407WRW0 1-4-30 AG

LANGQA474WRP0 1-4-37 AG

LANGTA196WRW0 1-4-6 AD

LANGTA340WRW0 2-3-3 AK

LBNDK0054WRE0 1-4-7 AB

LBNDKA036WRP0 1-2-7 AG

LFIX-A013WRW0 1-4-8 AB

LHLDKA009WRF0 1-2-6 AG

LSTPPA169WRF0 2-5-7 AH

LX-CZ0052WRE0 1-7-5 AA

LX-CZA030WRE0 1-7-20 A C

LX-CZA060WRE0 1-7-13 AA

LX-CZA074WRE0 1-7-8 AC

LX-WZA004WRE0 1-7-7 AA

LX-WZA022WRE0 1-7-15 A B

[ M ]

MCAMPA030WRF0 1-4-17 A C

MHNG-A165WRM0 1-4-35 AE

MLEVFA057WRW0 2-3-4 AE

MLEVPA231WRF0 1-2-2 AE

MSPRCA050WRE0 2-3-2-3 AB

MSPRTA192WRE0 2-5-8 AC

[ N ]

NBLTKA005WRE0 1-4-36 AF

NCPL-A021WRF0 1-4-22 AE

NFANJA020WRE0 1-4-32 AE

NFANMA019WRW0 1-4-9 AE

NPLYBA025WRF0 1-4-10 A C

NSFTTA042WRE0 2-3-5 AE

NSFTTA114WRE0 1-4-18 A B

NTNT-A019WRH0 1-4-3 AT

[ P ]

PCOVPA301WRE0 1-4-23 AE

PCUSGA236WRP0 1-4-40 A C

PCUSGA353WRP0 1-4-43 AH

PCUSGA381WRP0 2-3-1F AG

PCUSGA410WRP0 1-4-21 AD

PCUSGA537WRPZ 2-5-13 AD

PCUSUA167WRP0 1-4-14 AF

PCUSUA196WRP0 1-4-38 AD

PCUSUA197WRP0 1-4-24 AD

PCUSUA424WRP0 1-4-15 AG

PCUSUA425WRP0 1-4-39 AG

PDUC-A269WRW0 1-4-20 AK

PDUC-A882WRFZ 1-4-33 AQ

PFPF-A064WRE0 1-4-42 AF

PFPF-A138WRE0 1-4-12 AK

PFPF-A139WRE0 1-4-26 AF

PGLSPA455WRE0 1-4-25 AD

PGLSPA660WREZ 2-5-2 AX

PHOK-A137WRFZ 1-2-9 AM

PREFHA028WRW0 1-4-5 AR

PREFHA053WRW0 1-4-27 AP

PSKR-A153WRW0 1-4-28 AK

PSKR-A171WRW0 1-4-41 AE

PSKR-A323WRW0 1-4-29 AF

[ Q ]

QACC-A141WRZZ 1-1-3 AR

QACC-A155WRZZ 1-1-3 --

QCNCMA227DRE0 3-3-1A AC

QCNCMA237DRE0 3-3-1C AD

QCNCMA267DRE0 3-3-1B AC

QCNCWA057DRE0 3-3-1D AF

QFS-CA026WRZZ 1-1-4 AH

QFS-IA002WRE0 1-1-18 AQ

QFS-TA013WRE0 1-1-5 AG

QSOCLA022WRE0 1-1-7 AG

QSOCLA024WRE0 1-1-7 AH

QSW-MA085WRE0 1-1-9 AF

" 1-1-10 AF

QSW-MA086WRE0 1-1-8 AF

QSW-MA131WRE0 1-1-9 AG

" 1-1-10 AG

QSW-MA132WRE0 1-1-8 AH

[ R ]

RALM-A014DRE0 3-SP40 AG

RC-KZA087DRE0 3-C1 AA

" 3-C3 AA

" 3-C5 AA

" 3-C10 AA

" 3-C22 AA

RC-QZA229WRE0 1-1-11 AU

RC-QZA292WRZZ 1-1-11 --

RCRS-A035DRE0 3-CF1 AG

RH-DZA006PRE0 3-D1-4 AD

RHET-A139WRE0 1-1-12 AY

RH-IZA495DRE0 3-IC2 AL

RH-IZA840DRE0 3-IC1 AW

RH-VZA032DRE0 3-VRS1 AE

RLMPTA029WRE0 1-1-13 AL

RLMPTA069WRE0 1-1-13 AK

RLMPTA078WRE0 1-1-13 AL

RMOTDA191WRE0 1-1-14 AS

RMOTDA223WRE0 1-1-15 AZ

RMOTDA269WRZZ 1-1-14 --

RMOTEA284WRE0 1-1-17 AZ

RMOTEA303WRE0 1-1-16 AX

RMPTEA009DRE0 3-C70 AE

RRLY-A078DRE0 3-RY4-6 AG

RRLY-A083DRE0 3-RY1-3 AK

RTHM-A079WRE0 1-1-20 AL

RTHM-A080WRE0 1-1-5 AP

RTHM-A085WRE0 1-1-19 AL

PARTS CODE No.

PRICE RANK

NEW

MARK

PART RANK

Page 47

R990K(W)

RTHM-A099WRE0 1-1-19 --

RTHM-A111WRE0 1-1-20 AG

RTHM-A112WRE0 1-1-5 AG

RTHM-A117WRE0 1-1-20 AK

RTHM-A120WRE0 1-1-5 AH

RTHM-A121WRE0 1-1-19 AK

RTRN-A545WRE0 1-1-21 BS

RTRNPA089DRE0 3-T1 AU

RV-KXA077DRE0 2-3-1E AY

RV-MZA222WRE0 1-1-22 BN

[ T ]

TCADCA546WRR0 2-6-3 AZ

TCAUHA214WRR0 1-6-8 AF

TCAUHA343WRRZ 2-6-10 AF

TCAUSA008WRRZ 2-6-7 AK

TINSEB113WRRZ 2-6-6 AM

TLABNA226WRR0 1-6-9 AE

[ V ]

VCEAB31EW226M 3-C11 AA

VCEAB31HW104M 3-C21 AM

VCEAB31VW106M 3-C4 AA

" 3-C6 AA

" 3-C20 AA

VCEAB31VW108M 3-C2 AF

VCKYD11CY103N 3-C30 AA

" 3-C50 AA

" 3-C60 AA

" 3-C7-8 AA

VCTYF31HF103Z 3-C9 AB

VHD1SS270A/-1 3-D7 AA

" 3-D20-26 AA

" 3-D30-31 AA

" 3-D70-77 AA

VHEHZ161///-1 3-ZD2 AA

VHEHZ4A2///-1 3-ZD4 AA

VHEHZ5C2///-1 3-ZD3 AA

VRD-B12EF104J 3-R90-93 AA

VRD-B12EF153J 3-R30 AA

" 3-R50 AA

VRD-B12EF332J 3-R40 AA

" 3-R70-81 AA

VRD-B12EF472J 3-R31 AA

" 3-R51 AA

" 3-R7-8 AA

VRD-B12HF331J 3-R3 AA

VRD-B12HF471J 3-R2 AA

VRD-B12HF751J 3-R4 AA

VRN-B12EK101F 3-R63 AA

VRN-B12EK222F 3-R64 AA

VRN-B12EK753F 3-R62 AA

VRS-B13AA180J 3-R10-11 AA

VRS-B13AA331J 3-R100 AA

VS2SB1238//-3 3-Q1 AA

VSDTA123ES/-3 3-Q4 AA

VSKRA101M//-3 3-Q3 AB

" 3-Q40 AB

" 3-Q90 AB

" 3-Q20-23 AB

VSKRA223M//-3 3-Q24-25 AB

VSKRC243M//-3 3-Q26 AB

PARTS CODE No.

PRICE

RANK

NEW

MARK

PART RANK

[ X ]

XBPS730P14K00 1-7-9 AC

XBPS740P06KS0 1-7-14 AD

XBPS740P25000 1-7-10 A C

XBTWW40P06000 1-7-11 AA

XCBWW30P06000 1-7-21 AA

XCPS730P06000 1-7-17 A C

XCPS740P08000 1-7-16 A B

" 2-5-11 AB

XCPS740P12000 2-3-7 AC

XCTS740P08000 1-7-12 A C

XCTWW40P08000 1-7-3 AA

XEBS730P06000 2-5-12 A C

XEBS730P08000 2-5-15 AA

XEPS730P10XS0 2-3-6 AA

XFPS740P08000 1-7-22 A B

XFPS760P14JS0 1-7-23 AE

XHPS730P08000 1-7-25 A C

XHPS740P08K00 1-7-19 A B

XHTS740P08RV0 1-7-4 AG

" 1-2-3-2 AG

XNES740-32000 1-7-26 A C

XNEUW40-32000 1-7-27 AA

XOTS740P12000 1-7-2 AA

" 1-7-24 AA

XOTS740P12RV0 1-7-18 AD

" 2-3-8 AD

" 2-7-18 AD

XOTWW40P10000 1-7-1 AA

XWSUW40-10000 1-7-28 AA

XWVS760-07000 1-7-6 AC

PARTS CODE No.

PRICE RANK

NEW

MARK

PART

RANK

Page 48

No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

No part of this publication may be reproduced, stored in retrieval systems, or transmitted in anyform or by any means, electronic, mechanical, photocopying, recording, or other wise, without prior written permission of the publisher.