Sharp R-7N76(B)M, R-7N76(W)M Service Manual

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R-7N76(W)M R-7N76(B)M

LogiCook

JET convection & grill

R-7N76M

850W

SERVICE MANUAL

S6538R7N76M//

TEMP

CONV

GRILL

MED

LOW

AUTO

DEFROST COOK

Kg•Lb

MICROWAVE POWER LEVEL

TIMER / HOLD

HIGH

Pcs

Lbs

MIN.

SEC.

LOGICOOK

FOOD

DRINK

•

LESS

DUAL

CONVECTION

TEMP

/GRILL

STOP/

AUTO MINUTE

GRILL

CLEAR

/ START

AUTO

Kg / Lb

START

R-7N76

GRILL AND CONVECTION

MICROWAVE OVEN

MODELS

R-7N76(W)M R-7N76(B)M

In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.

TABLE OF CONTENTS

Page

CAUTION, MICROWAVE RADIATION........................................................................................................1

WARNING................................................................................................................................................... 1

PRODUCT SPECIFICATIONS ................................................................................................................... 2

APPEARANCE VIEW ................................................................................................................................. 3

OPERATION SEQUENCE.......................................................................................................................... 4

FUNCTION OF IMPORTANT COMPONENTS .......................................................................................... 6

SERVICING ................................................................................................................................................ 9

TEST PROCEDURE................................................................................................................................. 12

TOUCH CONTROL PANEL...................................................................................................................... 21

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE..................................................... 29

MICROWAVE MEASUREMENT .............................................................................................................. 34

WIRING DIAGRAM................................................................................................................................... 35

PICTORIAL DIAGRAM ............................................................................................................................. 38

CONTROL PANEL CIRCUIT .................................................................................................................... 39

PRINTED WIRING DIAGRAM .................................................................................................................. 40

PARTS LIST ............................................................................................................................................. 41

SHARP CORPORATION

R-7N76(W)M R-7N76(B)M

SERVICE MANUAL

GRILL AND CONVECTION

MICROWAVE OVEN

R-7N76(W)M/R-7N76(B)M

GENERAL IMPORTANT INFORMATION

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

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

CAUTION

MICROWAVE RADIATION

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

WARNING

Never operate the oven until the following points are ensured. (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is not any other visible damage with the oven.

Servicing and repair work must be carried out only by trained service engineers.

All the parts marked "*" on parts list are used at voltages more than 250V.

Removal of the outer wrap gives access to potentials above 250V.

All the parts marked "∆" on parts list may cause undue microwave exposure, by themselves, or when they are damaged, loosened or removed.

SHARP CORPORATION

OSAKA, JAPAN

R-7N76(W)M R-7N76(B)M

PRODUCT DESCRIPTION

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 240 Volts / 50 Hertz / Single phase, 3 wire earthed Power Consumption Microwave cooking 1.45 kW Approx. 7.1A

Dual cooking (Roast/Bake) 2.75 kW Approx. 12.3A Dual cooking (Grill) 2.65 kW Approx. 11.4A Convection cooking 1.4 kW Approx. 5.9A Grill cooking Max. 2.55 kW Approx. 10.6A

Power Output 850 watts nominal of RF microwave energy (measured by method of IEC 705)

Operating frequency 2450 MHz Convection heater Power Output Grill heater Power Output 1.2 kW (600W x 2) Case Dimensions Width 520 mm Height 305 mm (including foot) Depth 478 mm Cooking Cavity Dimensions Width 342 mm Height 195 mm Depth 357 mm Turntable diameter 325mm

Control Complement Touch Control System

Set Weight Approx. 21 kg

1.3 kW

Microwave Cooking Control

Repetition Rate;

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

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

MEDIUM................................. approx. 50% of FULL Power

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

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

LOGI COOK FOOD/DRINK pad

AUTO DEFROST pad AUTO COOK pad Weight (Number) pad LESS( TIMER / HOLD pad CONVERSION pad AUTO START / CLOCK ( ) pad AUTO MINUTE / START pad Time pads (10 MIN., 1MIN., 10 SEC.) MICROWAVE POWER LEVEL pad CONVECTION TEMP ˚C pad GRILL pad DUAL COOK (ROAST / BAKE / GRILL) pad STOP / CLEAR pad AUTO MINUTE pad START pad CLOCK pad

)/MORE( ) pads

OVEN

APPEARANCE VIEW

Door

Door hinges

Grill heating elements

Oven lamp

R-7N76(W)M R-7N76(B)M

Ventilation openings

Wave guide cover

Door lock openings

Door seals and sealing surfaces

Safety door latches

DISPLAY AND INDICATORS

Check indicators after the oven starts to confirm the oven is operating as desired.

1. GRILL indicator

2. CONVECTION indicator

3. TEMPERATURE indicator

4. AUTO COOK indicator

5. DEFROST indicator

6. COOK indicator

7. LESS/MORE indicator

8. MICROWAVE POWER indicators

9. NUMBER OF PIECES indicator

10. WEIGHT indicator

OPERATING KEYS

11. TIME keys

12. LOGICOOK pad

13. AUTO DEFROST key

14. WEIGHT ENTRY keys

15. MICROWAVE key

16. STOP/CLEAR key

17. GRILL key

18. MINUTE TIMER/HOLD key

19. AUTO COOK key

20. LESS/MORE keys

21. CONVECTION TEMPERATURE key

22. DUAL CONVECTION/GRILL key

23. AUTO MINUTE/START key

24. WEIGHT CONVERSION key

25. CLOCK SETTING key

26. DOOR OPEN button

Control panel

Coupling

Oven cavity

1 2 3

4 5

6 7

13 14

15 16

TEMP

CONV

AUTO

DEFROST COOK

MIN. MIN.

Kg•Lb g • oz

MICROWAVE POWER LEVEL

GRILL

TIMER / HOLD

GRILL

LOGICOOK

FOOD

CONVECTION

TEMP

STOP/

CLEAR

Kg / Lb

MED

Lbs

DRINK

HIGH

LOW

Pcs

SEC.

MORELESS

DUAL

CONVECTION

/GRILL

AUTO MINUTE

/ START

AUTO

START

R-7N76

Outer cabinet

Rear cabinets

Power supply cord

19 20

23 24

R-7N76(W)M R-7N76(B)M

OPERATION SEQUENCE

OFF CONDITION

Closing the oven door activates all door interlock switches (1st. latch switch, 2nd. latch switch and stop switch.)

IMPORTANT: When the oven door is closed, the contacts COM-NC of the

monitor switch must be open. When the microwave oven is pluged in a wall outlet (240V / 50Hz), 240 volts A.C. is supplied to the point H1 + H3 in the control unit.

Figure O-1 on page 35

1. The display flashes "88:88"

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

3. " : " appears in display.

NOTE: When the oven door is opened, the oven lamp

comes on at this time.

MICROWAVE COOKING CONDITION

HIGH COOKING

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

Function sequence Figure O-2 on page 35

CONNECTED COMPONENTS RELAY Oven lamp, Fan motor, Turntable motor RY1 High voltage transformer RY1 + RY2 Fan motor RY6

1. 240 volts A.C. is supplied to the primary winding of the high voltage transformer. The voltage is converted to about 3.3 volts A.C. output on the filament winding and high voltage of approximately 2000 volts A.C. on the secondary winding.

2. The filament winding voltage (3.3 volts) heats the magnetron filament and the high voltage (2000 volts) is sent to the voltage doubling circuit, where it is doubled to negative voltage of approximately 4000 volts D.C..

3. The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is channelled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.

4. When the cooking time is up, a signal tone is heard and the relays RY1 + RY2 + RY6 go back to their home position. The circuits to the oven lamp, high voltage transformer, fan motor and turntable motor are cut off.

5. When the oven door is opened during a cooking cycle, the switches come to the following condition.

Switch Contact Condition

During Oven Door

1st latch Switch COM-NO Closed Opened Monitor Switch COM-NC Opened Closed 2nd latch switch COM-NO Closed Opened Stop switch

COM-NO Closed Opened

The circuit to the high voltage transformer and turntable motor are cut off when the 1st latch switch, 2nd. latch switch and stop switch are made open. The circuit to the fan motor is cut off when the relay RY6 is made open. The oven lamp remains on even if the oven door is opened after the cooking

Cooking Open(No cooking)

cycle has been interrupted, because the relay RY1 stay closed. Shown in the display is remaining time.

6. MONITOR SWITCH CIRCUIT The monitor switch is mechanically controlled by the

oven door, and monitors the operation of the 1st latch switch.

6-1. When the oven door is opened during or after the cycle

of a cooking program, the 1st latch switch and stop switch must open their contacts (COM-NO) first. After that the contacts (

COM-NC) of the monitor switch can be closed and the contacts of stop switch can be opened.

6-2. When the oven door is closed, the contacts (

COM-NC) of the monitor switch must be opened first, and the contacts (COM-NO) of 2nd. latch switch must be closed. After that the contacts of the 1st latch switch and the stop switch are closed.

6-3. When the oven door is opened and the contacts of the

1st latch switch remain closed, the fuse M8A will blow, because the monitor switch are closed and a short circuit is caused.

MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING

When the microwave oven is preset for variable cooking power, the 240 volts A.C. power is supplied to the high voltage transformer intermittently within a 32-second time base through the relay contact which is coupled with the current-limiting relay RY2. The following levels of microwave power are given.

30 sec. ON

HIGH

MEDIUM HIGH

MEDIUM

MEDIUM LOW

LOW

24 sec. ON

18 sec. ON

12 sec. ON

6 sec. ON

8 sec. OFF

14 sec. OFF

20 sec. OFF

28sec. OFF

Approx. 100%

Approx. 70%

Approx. 50%

Approx. 30%

Approx. 10%

Note: The On/Off time ratio does not exactly correspond to

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

CONVECTION COOKING CONDITION

PRE-HEATING CONDITION (Figure O-3)

Program desired convection temperature by touching CONVECTION pad.

When the START pad is touched, the following operations occur:

1. The coil of shut-off relays RY1,RY4 and RY6 are energized, the oven lamp, cooling fan motor, turntable motor and convection motor are turned on.

2. The coil of shut-off relay RY3 is energized by the control unit and the main supply voltage is added to the convection heating element.

3. When the oven temperature reaches the selected pre-

R-7N76(W)M R-7N76(B)M

heat temperature, the following operations occur;

3-1. The shut-off relay RY3 is de-energized by the control

unit temperature circuit and thermistor, opening the circuit to the convection heating element.

3-2. The oven will continue to function for 15 minutes,

turning the convection heating element on and off, as needed to maintain the selected pre-heat temperature.

The oven will shut-down completely after 15 minutes.

CONVECTION COOKING CONDITION (Figure O-3)

When the pre-heat 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. Program desired cooking time and convection temperature by touching the CONVECTION pad. When the START pad is touched, the following operations occur:

1. The numbers of the digital readout start the count down to zero.

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

3. Relay RY3 is energized (If the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the convection heating element 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 convection cycle, if the cavity air temperature is above 104˚C, the circuit to RY6 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until temperature drops below 104˚C, at that time the relay will be de-energized, turning off the fan motor .

GRILL COOKING CONDITION (Figure O-4)

In this condition the food is cooked by grill heating element energy. And at the initial period (approximately 10 minutes) the convection heater element is also activated.

Program desired cooking time and grill mode by touching TIME pads and GRILL pad. When the START pad is touched, the following operations occur:

1. The numbers of the digital readout start the count down to zero.

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

3. The relay RY5 is energized and the grill heating element is energized.

4. The relay RY3 is energized, if the cavity temperature is lower than 210˚C and grill heating element is energized.

When the cavity temperature reaches 210˚C, relay RY4 and RY3 are de-energized.

5. Now, the food is grilled by the grill heating elements..

3. Relay

RY3 is energized (If the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the convection heating element.

4. Relay

RY2 is energized and the microwave energy is generated by magnetron.

5. Now, the food is cooked by the microwave and convection heating elements energy simultaneously.

DUAL COOKING (GRILL) CONDITION

(Microwave and Grill) (Figure O-6)

Program desired cooking time and DUAL COOK (GRILL) mode by touching the TIME pads and DUAL COOK pad three times. When the START pad is touched, the following operations occur:

1. The numbers of the digital readout start the count down to zero.

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

3. Relay RY5 is energized and the main supply voltage is applied to the grill heating element.

4. Relay RY2 is energized and the microwave energy is generated by magnetron.

5. Now, the food is cooked by the microwave and grill heating elements energy simultaneously.

INSTANT ACTION

When the menu and quantity are input, the oven chooses cooking mode (Microwave, Convection, Grill or Dual) and sets cooking time automatically according to the pre-programmed information in IC-1 (LSI).

AUTO DEFROST COOKING

AUTO DEFROST automatically works out the correct microwave power and time for defrosting.

What should be done is to chose menu and to enter the weight of food with the Weight Entry pad.

Once the oven starts, it will cook according to the special cooking sequence.

AUTO COOK programme

Keep on touching the AUTO COOK pad until the desired cooking programme appears in the display.

Then using the Weight Entry pad, enter the weight and touch the START key.

The cooking modes and cooking time are automatically computed and selected based on the programmes.

DUAL COOKING (ROAST / BAKE) CONDITION

(Microwave and Convection) (Figure O-5)

Program desired cooking time and DUAL COOK (ROAST / BAKE) mode by touching the TIME pads and DUAL COOK pad once or twice. When the START pad is touched, the following operations occur:

1. The numbers of the digital readout start the count down to zero.

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

R-7N76(W)M R-7N76(B)M

FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM

The door can be opened by pushing the open button on the control panel. When the open button is pushed, the open lever pushes lower latch head on the door upward. The upper latch head is linked with the lower latch head, so now, the door can be opened.

LATCH HOOK

LATCH HEADS

DOOR OPEN BUTTON

2ND LATCH SWITCH

STOP SWITCH

MONITOR LATCH SWITCH

1ST LATCH SWITCH

OPEN LEVER

Figure D-1. Door Open Mechanism

1ST LATCH SWITCH, 2ND LATCH SWITCH AND STOP SWITCH

1. When the oven door is closed, the contacts COM-NO of each switch must be closed.

2. When the oven door is opened, the contacts COM-NO of each switch must be opened.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative by means of blowing the fuse M8A when the contacts of the 1st latch switch fail to open when the door is opened.

FUSE 13A 250V

If the wire harness or electrical components are shortcircuited, this fuse 13A 250V blows to prevent an electric shock or fire hazard.

FUSE M8A 250V

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

2. The fuse also blows when 1st latch switch remains closed with the oven door open and when the monitor switch contact (COM-NC) closes.

3. The fuse also blows when the asymmetric rectifier, H.V. rectifier,.H.V. wire harness, H.V. capacitor, magnetron or secondary winding of high voltage transformer is shorted.

TC TRANSFORMER

TC transformer converts A.C. line voltage into low voltage to drive the control unit.

THERMAL CUT-OUT 170˚C (OVEN)

The thermal cut out protects the oven against overheating during grill cooking, convection cooking or dual (combination) cooking. If the temperature rises above 170˚C because the fan motor is interrupted, the air inlet duct is blocked or the ventilation openings are obstructed, the thermal cut-out opens and switches off the all electrical parts.

The defective thermal cut-out must be replaced with a new one.

THERMAL CUT-OUT 125˚C (MG)

This thermal cut-out protects the magnetron against overheat. If the temperature goes up higher than 125˚C because the fan motor is interrupted or the ventilation openings are blocked, the thermal cut-out will open and line voltage to the high voltage transformer will cut off, and operation of the magnetron will be stopped. The defective thermal cut-out must be replaced with a new one.

Function

1. When the door is opened, the contacts (COM-NC) of monitor switch SW4 close (to the ON condition) due to their being normally closed.

At this time the 1st latch is in the OFF condition (contacts open) due to their being normally open contact switches.

2. As the door goes to a closed position, the monitor switch contacts (COM-NC) are opened and 2nd latch switch contacts COM-NO are closed and then contacts of 1st. latch switch and stop switch close. (On opening the door, each of these switches operate inversely.)

3. If the door is opened and the 1st latch switch contacts fail to open, the fuse M8A) blows immediately after closing of the monitor switch (COM-NC) contacts.

CAUTION: BEFORE REPLACING A BLOWN FUSE M8A

TEST THE 1ST LATCH, MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OPERATION.(REFER TO CHAPTER “TEST PROCEDURE”).

MONITOR RESISTOR

The monitor resistor prevents the fuse M8A bursting when the fuse M8A blows due to the operation of the monitor switch circuit.

THERMAL CUT-OUT 190˚C (CONV.)

The thermal cut out protects the convection motor against overheating. If the temperature of the thermal cut-out rises above 190˚C because the convection fan is interrupted, the ventilation openings are obstructed or the other abnormal matter occurs, the thermal cut-out opens and switches off the convection heating element and conv. indicator light. When the oven cools itself down to the operating temperature of 170˚C, the contacts of the thermal cut-out will close again.

ASYMMETRIC RECTIFIER

The asymmetric rectifier is a solid state device that prevents current flow in both directions. And it prevents the temperature rise of the power transformer by blowing the fuse M8A when the high voltage rectifier is shorted.

D2 D1

ASYMMETRIC RECTIFIER

HIGH VOLTAGE RECTIFIER

R-7N76(W)M R-7N76(B)M

The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 KV. The rated peak reverse voltage of D2 of the asymmetric rectifier is 1.7 KV. D1 and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage. (The process of the blowing the fuse M8A.)

1. The high voltage rectifier is shorted by any causes when microwave cooking or dual cooking.

2. The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.

3. D2 of the rectifier is shorted.

4. The large electric currents flow through the high voltage winding of the high voltage transformer.

5. The large electric currents beyond 8A flow through the primary winding of the high voltage transformer.

6. The fuse M8A blows by the large electric currents.

7. The power supplying to the high voltage transformer is cut off.

NOISE FILTER

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

TURNTABLE MOTOR

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

convection heating element, 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 heating element is deenergized. When the temperature inside the oven cavity drops below the selected temperature, the convection heating element 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 heating element is de-energized and the convection fan stops operating and the oven shuts off. At the high temperature (more than 104˚C), the fan motor remains rotating. Automatically the fan motor will be shut down at low temperature (less than 104˚C).

Door

Oven Cavity

Grill Heating Elements

Convection Passage

Convection Heating Element

Auxiliary Fan

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 channeled 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.

CONVECTION MOTOR

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

GRILL HEATING ELEMENT

The grill heating element is provided to brown the food and is located on the top of the oven cavity.

CONVECTION HEATING ELEMENT

The convection heating element 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 heating element.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated up by the convection heating element, but is instead heated by forced circulation of the hot air produced by the convection heating element.

The air heated by the convection heating element 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 back 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 rear wall.

Without leaving the oven, this hot air is reheated by the

Convection Motor

Convection Fan

Turntable Motor

Turntable

Roller Stay

Figure D-2. Convection Cooking System

DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except during convection cooking, grill cooking and dual cooking.

Damper position is set automatically by damper motor, damper switch, damper cam and damper shaft.

These components are operated by a signal that judges if microwave cooking or other cooking operation is selected by the CPU unit.

Microwave Cooking:

Damper is in the open position, because a portion of cooling air is channeled through the cavity to remove steam and vapors given off from the heating foods.

It is then exhausted at the top of the oven cavity into a condensation compartment.

Convection, Grill and Dual Cooking:

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

Damper Operation

1. When power supply cord is plugged in: 1-1. When power supply cord is plugged in, a signal is

sensed in the control unit, and operates shut-off relay (RY7).

1-2. Contacts of shut-off relay (RY7) close, the damper

R-7N76(W)M

CONVECTION

MOTOR

THERMISTOR

Sensing

Voltage

OFF

02 20 30 32 64 (sec.)

3 sec.

Sensing the voltage across temperature measurement circuit.

R-7N76(B)M

motor is energized, opening the damper door.

1-3. When the damper is moved to the open position by the

damper cam, damper switch is closed (ON position).

1-4. The signal of damper switch is re-sensed in the control

unit and shut-off relay (RY7) is turned off.

1-5. The A.C. line voltage A.C. 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, grill or dual cooking:

3-1 Damper motor is energized right after the oven is

started.

3-2. When damper is in the closed position (damper switch

is OFF), its signal is sensed by the control unit, and shut-off relay (RY7) is de-energized.

3-3. The damper is held in the closed position during the

cooking operation

3-4. At the end of the cooking, shut-off relay (RY7) is

energized, and the damper is returned to the open position.

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

closed durining convection, grill or dual, or open durning microwave, the control unit will stop oven operation after 1 minute.

Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Grill cooking OPEN Dual cooking OPEN

SENSING FIRE OPERATION

The oven will stop its operation when there is a fire in the oven cavity in microwave cooking condition.

LSI measures the voltage across the temperature measurement circuit intermittently within a 32-second time base after since the oven is started in microwave cooking condition.

The oven will stop its operation when the difference of the voltages is more than 0.3 volts in microwave cooking condition.

1. Within a 32-second base, first the thermistor is energized for 3 seconds. After 2 seconds since the thermistor is energized, the voltage across the temperature measurement circuit is measured. And after 21 seconds since the thermistor is cut off, the convection motor operates for 10 seconds.

2. The oven carries out the procedure above again. If the second voltage is 0.3V higher than the first voltage, LSI judges it is a fire in the oven cavity and stops the oven.

3. When sensor cooking, the sensing fire operation is not carried out until the oven senses the steam from food. Because food cannot be cooked well by rotating the convection fan at that time. After sensing the steam, the sensing fire operation is started.

4. When LSI judges it is fire in the oven cavity, LSI will switch off the relays to the power transformer, fan motor and convection motor and LSI stops counting down. And then the damper is closed so that the fresh air does not come into the oven cavity.

10 sec.

R-7N76(W)M R-7N76(B)M

SERVICING

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts will result in electrocution. High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage harness.

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge 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 high-voltage capacitor (that is, of the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.

Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may, in some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the high voltage 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 high voltage 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. And set the power level to HIGH (100%) and push the start key. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out 3D checks and re-examine the connections to the component being tested.

When all service work is completed, and the oven is fully assembled, the microwave power output should be checked and microwave leakage test carried out.

TROUBLESHOOTING GUIDE

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

IMPORTANT: If the oven becomes inoperative because of a blown fuse M8A in the 1st latch switch - monitor switch - monitor

resistor circuit, check the 1st latch switch, monitor switch and monitor resistor before replacing the fuse M8A.

R-7N76(W)M R-7N76(B)M

TEST PROCEDURE

CONDITION PROBLEM

Fuse M8A browns when the door is opened. Home fuse blows when power cord is plugged into wall outlet.

OFF CONDITION

COOKING CONDITION (

COMMON MODE)

MICROWAVE COOKING CONDITION

CONVECTION COOKING CONDITION

GRILL COOKING CONDITION

DUAL COOKING CONDITION (COMMON MODE)

DUAL COOKING CONDITION (ROAST/BAKE)

DUAL COOKING CONDITION (GRILL)

Fuse 13A browns when power cord is plugged into wall outlet. "88:88" does not appear in display when power cord is plugged into wall

outlet. Display does not operate properly when STOP/CLEAR key is touched. Oven lamp does not light when door is opened. (Display operates.) Oven does not start when the START key is touched. (Display operates.) Oven lamp does not light And turntable motor does not operate. Fan motor does not operate. (Oven lamp lights.) Convection fan motor does not operate. (Oven lamp lights.) Turntable motor does not operate. (Oven lamp lights.) Oven or any electrical parts (except fan motor) does not stop when

cooking time is 0 or STOP/CLEAR key is touched. Oven stops after about 4 minutes since START key is touched. (Except

Microwave and Dual Cook modes) Display operates properly but all electrical parts do not operate. The oven stops 1 minute after starting. Oven goes into cook cycle but shuts down before end of cooking cycle. After cooking, the temperature of oven cavity is higher than 104˚C but the

fan motor does not operate. Oven seems to be operating but little or no heat is produced in oven load.

(Microwave power control is set at HIGH) Oven does not seem to be operating properly during variable cooking

condition. (Oven operates properly at HIGH) Oven goes into cook cycle but shuts down before end of cooking cycle. Convection heating element does not heat. Oven seems to be operate when the temperature in the oven cavity is

lower or higher than preset one. Grill heating element does not heat. Convection heating element does not stop when the temperature of oven

cavity is higher than 210˚C or it stop to heat when the temperature of oven cavity is lower than 210˚C

Oven goes into cook cycle but shuts down before end of cooking cycle. Oven seems to be operating but little or no heat is produced in oven load.

(Microwave power does not seem to be generated properly) Oven seems to be operating but the temperature of oven cavity is lower

or higher than preset one. Convection heating element does not heat. Grill heating element does not heat.

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

ABCDEEEEFEGGGH

MAGNETRON

HIGH VOLTAGE TRANSFORMER

H.V. RECTIFIER ASSEMBLY

H.V. HARNESS

HIGH VOLTAGE CAPACITOR

1ST. LATCH SWITCH

2ND. LATCH SWITCH

STOP SWITCH

MONITOR SWITCH

MONITOR RESISTOR

DAMPER SWITCH

THERMAL CUT-OUT 170˚C

THERMAL CUT-OUT 125˚C

THERMAL CUT-OUT 190˚C

TURNTABLE MOTOR

R-7N76(W)M R-7N76(B)M

HHH I JKL LM

FAN MOTOR

DAMPER MOTOR

CONVECTION FAN MOTOR

NOISE FILTER

FUSE 13A

FUSE M8A

GRILL HEATING ELEMENT

CONVECTION HEATING ELEMENT

THERMISTOR

POWER SUPPLY CORD

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

OVEN LAMP OR SOCKET

KEY UNIT

TC TRANSFORMER

TOUCH CONTROL PANEL

BLOCKED VENTILATION OPENINGS

WRONG OPERATION

MIS-ADJUSTMENT OF SWITCHES

HOME FUSE OR BREAKER

NO POWER AT WALL OUTLET

BLOCKED CONVECTION FAN

BLOCKED COOLING FAN

RELAY (RY1, 2, 3, 4, 5, 6, 7)

FOIL PATTERN

R-7N76(W)M R-7N76(B)M

TEST PROCEDURES

PROCEDURE

LETTER

A MAGNETRON TEST

COMPONENT TEST

NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.

CARRY OUT 3D CHECK Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron

filament terminals, the meter should show a reading of less than 1 ohm. To test for short filament to anode condition, connect ohmmeter between one of the filament terminals

and the case of the magnetron (ground). This test should indicate an infinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.

MICROWAVE OUTPUT POWER (IEC-705-1988)

The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted). Microwave output power from the magnetron can be measured by way of IEC 705, i.e. it can be measured by using water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W) heating works for t(second), approximately P x t/4.187 calorie is generated. On the other hand, if the temperature of the water with V(ml) rises ∆T (°C) during this microwave heating period, the calorie of the water is V x ∆T.

The formula is as follows;

P x t / 4.187 = V x ∆ T P (W) = 4.187 x V x ∆T / t

Our condition for water load is as follows:

Room temperature..............around 20°C Power supply Voltage.........Rated voltage

Water load.........1000 g Initial temperature...........10±2°C Heating time.........52 sec.

P=85x∆T

Measuring condition:

1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material

thickness of 3 mm and an outside diameter of approximately 190 mm.

2. Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start the test.

3. Temperature of the water The initial temperature of the water is (10±2)°C.

4. Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5K.

5. Select stirring devices and measuring instruments in order to minimize addition or removal of heat.

6. The graduation of the thermometer must be scaled by 0.1°C at minimum and accurate thermometer.

7. The water load must be (1000±5) g.

8. “t” is measured while the microwave generator is operating at full power. Magnetron filament heatup time is not included.

NOTE:The operation time of the microwave oven is “t + 2” sec. 2 sec. is magnetron filament heat-up time. Measuring method:

1. Measure the initial temperature of the water before the water is added to the vessel. (Example: The initial temperature T1 = 11°C)

2. Add the 1 litre water to the vessel.

3. Place the load on the centre of the shelf.

4. Operate the microwave oven at HIGH for the temperature of the water rises by a value ∆ T of (10 ± 2) K.

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.

TEST PROCEDURES (CONT'D)

R-7N76(W)M R-7N76(B)M

PROCEDURE

LETTER

B HIGH VOLTAGE TRANSFORMER TEST

COMPONENT TEST

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

Temperature after (49 + 3) = 52 sec. ..................................................................... T2 = 21°C

Temperature difference Cold-Warm.................................................................... ∆T1 = 10°C

Measured output power

The equation is “P = 85 x ∆T” ...................................................... P = 85 x 10°C = 850 Watts

JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.

CAUTION:1°C CORRESPONDS TO 85 WATTS. REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

1000g

T1˚C

Heat up for 52 sec.

1000g

T2˚C

WARNING: High voltages and large currents are present at the secondary winding and

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

CARRY OUT 3D CHECKS Disconnect the leads to the primary winding of the high voltage transformer. Disconnect the filament and

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

a. Primary winding 1.55 ohms approximately b. Secondary winding 85 ohms approximately c. Filament winding less than 1 ohm

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

CARRY OUT 4R CHECKS

C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST

HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested

using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading.

The normal resistance is infinite in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R CHECKS

D2 D1

ASYMMETRIC RECTIFIER TEST

CARRY OUT 3D CHECKS.

ASYMMETRIC RECTIFIER

HIGH VOLTAGE RECTIFIER

R-7N76(W)M R-7N76(B)M

TEST PROCEDURES (CONT'D)

PROCEDURE

LETTER

D HIGH VOLTAGE CAPACITOR TEST

COMPONENT TEST

Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric can be tested using an ohmmeter set to its highest range across the terminals A+B of the asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both direction then the asymmetric rectifier is good. If an asymmetric rectifier is shorted in either direction, then the asymmetric rectifier is probably faulty and must be replaced with high voltage rectifier. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the power transformer is shorted.

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 DIRECTIONS.

CARRY OUT

3D CHECKS

A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resistance

range.

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

been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance. F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance. G. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal. If incorrect reading are obtained, the high voltage capacitor must be replaced.

CARRY OUT

4R CHECKS

E SWITCH TEST

CARRY OUT 3D CHECKS Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the

following table.

Plunger Operation COM to NO COM to NC

Released O.C. S.C. Depressed S.C. O.C.

COM; Common terminal, NO; Normally open terminal NC; Normally close terminal S.C.; Short, O.C.; Open circuit

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

4R CHECKS.

F MONITOR RESISTOR TEST

CARRY OUT 3D CHECKS Disconnect the leads from the monitor resistor.

Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor as described in the following table.

Table: Terminal Connection of Switch

Table: Resistance

Resistor Resistance

Monitor resistor Approx. 0.8Ω

If incorrect readings are obtained, replace the monitor resistor. CARRY OUT

4R CHECKS

TEST PROCEDURES (CONT'D)

R-7N76(W)M R-7N76(B)M

PROCEDURE

LETTER

G THERMAL CUT-OUT TEST

COMPONENT TEST

CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity

test across the two terminals as described in the below.

CARRY OUT 4R CHECKS

Temperature of Temperature of Indication of "ON" condition "OFF" condition ohmmeter

Parts Name (closed circuit). (open circuit). (When room

(˚C) (˚C) temperature is

Thermal cut-out This is not resetable Above 170˚C Closed circuit 170˚C type.

Thermal cut-out This is not resetable Above 125˚C Closed circuit 125˚C type

Thermal cut-out Below 170˚C Above 190˚C Closed circuit. 190˚C

Table: Thermal Cut-out Test

approx. 20˚C.)

If incorrect readings are obtained, replace the thermal cut-out. An open circuit thermal cut-out (MG) indicates that the magnetron has overheated, this may be due to

resistricted ventilation, cooling fan failure. An open circuit thermal cut-out (OVEN) indicates that the oven cavity has overheated, this may be due

to no load operation. An open circuit thermal cut-out (CONV.) indicates that the convection fan motor winding has overheated,

this may be due to resisted ventilation or locked cooling fan or locked convection fan motor.

H MOTOR WINDING TEST

CARRY OUT 3D CHECKS Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals

as described in the table below.

Fan motor Approximately 197 Ω Turntable motor Approximately 16 kΩ Convection fan motor Approximately 164 Ω

Damper motor Approximately 16 kΩ If incorrect readings are obtained, replace the motor. CARRY OUT

4R CHECKS

I NOISE FILTER TEST

CARRY OUT 3D CHECKS Disconnect the leads from the terminals of noise filter.

Using an ohmmeter, check between the terminals as described in the following table.

Table: Resistance of Motor

Motors Resistance

13A

F8A

L (min) Cx ± 20% Cy ± 20%

1.0mH 0.22µF 4700pF

WHT

RED

R1: 10 MΩ ± 20% R2 : 680 kΩ ± 20%

MEASURING POINTS INDICATION OF OHMMETER

Between N and L Approx. 680 kΩ Between terminal N and WHITE Short circuit

Between terminal L and ORG Short circuit If incorrect readings are absorbed, replace the noise filter unit. CARRY OUT

4R CHECKS

R-7N76(W)M R-7N76(B)M

TEST PROCEDURES (CONT'D)

PROCEDURE

LETTER

J FUSE 13A

K BLOWN FUSE F2 M8A

COMPONENT TEST

CARRY OUT 3D CHECKS If the fuse 13A is blown, there is a shorts or grounds in electrical parts or wire harness. Check them and

replace the defective parts or repair the wire harness. CARRY OUT 4R CHECKS

CAUTION: Only replace fuse with the correct value replacement.

CARRY OUT 3D CHECKS

1. If the fuse M8A is blown when the door is opened, check the 1st latch switch, monitor switch and monitor resistor.

2. If the fuse M8A is blown by incorrect door switching replace the defective switch(es) and the fuse M8A.

3. If the fuse M8A is blown, there could be a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.

4. If the fuseM8A is blown, there could be shorts in the asymmetric rectifier or there is a ground in wire harness. A short in the asymmetric rectifier may be occurred due to short or ground in H.V. rectifier, magnetron, high voltage transformer or H.V. wire. Check them and replace the defective parts or repair the wire harness.

CARRY OUT 4R CHECKS CAUTION: Only replace fuse M8A with the correct value replacement.

L CONVECTION HEATING ELEMENT AND GRILL HEATING ELEMENT TEST

CARRY OUT 3D CHECKS Before carrying out the following tests make sure the heating element is cool completely.

1. Resistance of heating element. Disconnect the wire leads to the heating element to be tested. Using ohmmeter with low resistance

range. Check the resistance across the terminals of the heating element as described in the following table.

Table: Resistance of heating element Parts name Resistance Convection heating element Approximately 44 Ω Grill heating element Approximately 24 Ω x 2 = 48 Ω

2. Insulation resistance. Disconnect the wire leads to the heating element to be tested. Check the insulation resistance

between the element terminal and cavity using a 500V - 100MΩ insulation tester. The insulation resistance should be more than 10M&ohm in the cold start.

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

CARRY OUT 4R CHECKS

M THERMOSTAT TEST

CARRY OUT 3D CHECKS.

Disconnect connector-B from CPU unit. Measure the resistance of thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No's B5 and B6 of the thermistor harness.

Room Temperature Resistance 20˚C - 30˚C Approximately 326 kΩ - 175 kΩ

TEST PROCEDURES (CONT'D)

PROCEDURE

LETTER

N TOUCH CONTROL PANEL ASSEMBLY TEST

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

1. Key Unit The following symptoms indicate a defective key unit. Replace the key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.

2. Control Unit The following symptoms indicate a defective control unit. Replacing the control unit.

2-1 In connection with pads.

a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal.

2-2 In connection with indicators

a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker.

2-3 Other possible problems 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. d) Proper temperature measurement is not obtainned.

COMPONENT TEST

R-7N76(W)M R-7N76(B)M

O KEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon 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 connecter). Use the Key unit matrix indicated on 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 a faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.

G9 G10 G11 G12

G8 G1G2G3G4G5G6G7

GRILL

MICROWAVE

POWER

LEVEL

STOP

/CLEAR

LESS

AUTO

MINUTE

/START

TIMER /HOLD

KEY UNIT

AUTO

START

AUTO

COOK

Kg • LbKg / Lb

g • oz

AUTO

DEFROST

LOGICOOK

DRINK

MIN.

SEC.

LOGICOOK

FOOD

CONVEC

TION

TEMP

DUAL

CONVECTION

/GRILL

R-7N76(W)M R-7N76(B)M

PROCEDURE

LETTER

TEST PROCEDURES (CONT'D)

COMPONENT TEST

P RELAY TEST

1. CARRY OUT 3D CHECKS.

2. Disconnect the leads from the primary of the high voltage transformer. Make sure that the leads remain isolated from other oven components and chassis. (Use insulation tape if necessary.)

3. Close the door.

4. Reconnect the supply.

5. Check the voltage between Pin Nos. 1 and 3 of the 6 pin connector (H) on the control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven circuit.

6. RY1, RY2 , RY3, RY4, RY5, RY6 and RY7 TEST

These are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the

microwave cooking operation.

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

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

unit is defective.

RELAY SYMBOL

OPERATIONAL

CONNECTED COMPONENTS

VOLTAGE

RY1 Approx. 25.0V.D.C. Oven lamp / Turntable motor RY2 Approx. 25.0V.D.C. High voltage transformer

RY3 Approx. 25.0V.D.C. Convection heater RY4 Approx. 25.0V.D.C. Grill heater

CARRY OUT 4R CHECKS

RY5 Approx. 25.5V.D.C. Convection motor RY6 Approx. 25.5V.D.C. Fan motor RY7 Approx. 25.5V.D.C. Damper motor

Q 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.

STEPS OCCURANCE CAUSE OR CORRECTION

1 The rated AC voltage is not present at

POWER terminal of CPU connector (CN-A)

2 The rated AC voltage is present at primary

side of low voltage transformer.

3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder. (CARRY OUT 3D

4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

Check supply voltage and oven power cord.

Low voltage transformer or secondary circuit defective. Check and repair.

CHECKS BEFORE REPAIR)

(CARRY OUT 3D CHECKS BEFORE REPAIR)

CARRY OUT 3D CHECKS. NOTE: *At the time of these repairs, make a visual

inspection of the varistor for burning damage and examine the transformer with tester 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.

POWER

CONV M F

VRS1

(J1)

RY5

TEST PROCEDURES (CONT'D)

PROCEDURE

LETTER COMPONENT TEST

AH SENSOR TEST Checking the initial sensor cooking condition

(1) The oven should be plugged in at least five 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, chilled convenience food 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 5 min.30 sec if the sensor has not detected the vapor of the food in LOGICOOK DRINK mode, "STIR"

will appear and the oven will shut off.

R-7N76(W)M R-7N76(B)M

Water load cooking test

Make sure the oven has been plugged in at least five 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 "LOGICOOK DRINK" pad once. Now, the oven is in the sensor cooking condition. "DRINK" will

appear and flash on and off in the display. (5) The oven will operate for the first 16 seconds, without generating microwave energy. NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage of sensor

cooking

(6) After approximately 16 seconds, microwave energy is produced, oven should turn off after water is heating.

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

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:

6-1. Fill approxmately 200 milliliters (7.2 oz) of tap water in a 1000 milililiter measuring cup.

6-2. Place the container on the center of tray in the oven cavity.

6-3. Close the door.

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 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:

6-1. Touch "LOGICOOK DRINK" pad once.

6-2. The control panel is in the sensor cooking operation.

6-3. After approxmately 60 seconds, push plunger of select switch. This condition is same as judgement

by AH sensor.

6-4. After approxmately 13 seconds, cooking operation turns off, an audible signal will sound, and the

display will show "STIR".

R-7N76(W)M R-7N76(B)M

TEST PROCEDURES (CONT'D)

PROCEDURE

LETTER COMPONENT TEST

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

To connector (F) on Control Unit.

F-1 F-2

F-3

CONNECTOR

1 2 3

R1,R2 : 22 ohm ± 1% 1/2W R3 : 10k ohm ± 5% 1/2W R4 : 1M ohm ± 5% 1/2W

R3 R4

COM

Plunger

NC NO

COM

Sensor Dummy Resistor Circuit

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

R-7N76(W)M R-7N76(B)M

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 the signals communicated among them are explained below.

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P05,P06,P07,P10, P11 and P12. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P24,P25,P26 and P27 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit and indicator circuit.

1) LSI(IC1)

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

2) Power Source Circuit

This circuit generates voltages necessary in the control unit.

Symbol Voltage Application

VC -5V LSI(IC1) VP -26V Fluorescent display tube : Grid

and anode voltage

VF1 3Vac Filament of fluorescent display

tube

VF2 (VF1 to VF2 voltage)

3) Synchronizing Signal Circuit

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

4) ACL Circuit

A circuit to generate a signal which resets the LSI to the initial state when power is supplied.

5) Buzzer Circuit

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

6) Door Sensing Switch (Stop Switch)

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

7) Relay Circuit

To drive the magnetron, fan motor, turntable motor, convection motor, damper motor, convection heater, grill heater and light the oven lamp.

8) Indicator Circuit

Indicator element is a Fluorescent Display. Basically, a Fluorescent Display is triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode. The Fluorescent Display has 6-digits, 14-segments are used for displaying figures.

9) Absolute Humidity Sensor Circuit

The circuit detects absolute humidity of a food whith is under cooking, to allow its automatic cooking.

10) IC2 (IC)

This is a memory IC, responsible for "LOGICOOK" function.

R-7N76(W)M R-7N76(B)M

DESCRIPTION OF LSI

LSI(IZA627DR)

The I/O signal of the LSI(IZA627DR) 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 illumination voltage: -26V.

Vp voltage of power source circuit input.

3 AVSS IN Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. The reference voltage is generally maintaned at -5V.

4 VREF IN Reference voltage input terminal.

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

5 AN7 IN 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.

6 AN6 IN 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 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.

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: VC).

12 AN0 IN Input signal which communicates the door open/close information to LSI.

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

13 P55 OUT Damper motor relay driving signal.

To turn on and off shut-off relay (RY7).

OFF

H : GND

14 P54 OUT Oven lamp and turntable motor driving signal. (Square Waveform : 50Hz).

To turn on and off the shut-off relay (RY1).

20 msec

The square waveform voltage is delivered to the relay (RY1) driving circuit and relays (RY2-RY5) control circuit.

During cooking

15 P53 OUT Fan motor driving signal.

To turn on and off the shut-off relay (RY6). The signal holds “L” level during cooking and holds “H” level while not cooking.

16 P52 OUT Heating element driving signal.

To turn on and off heater relay (RY3). “L” level during convection cooking or dual cooking; “H” level otherwise. During convection cooking or dual cooking; the signal

(Convection or dual)

During cooking

OFF

becomes "H" level when the temperature of the oven cavity exceeds the predetermined temperature.

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 (M. HIGH, MED, M.LOW, LOW) the signal turns to “H” level and “L” level in repetition according to the power level. Note

VARI-MODE ON-TIME OFF-TIME

HIGH DEF 32sec. 0sec.

(100% power) DUAL 48sec. 0sec.

M.HIGH DEF 24sec. 8sec.

(approx. 70% power) DUAL 36sec. 12sec.

MED DEF 18sec. 14sec.

(approx. 50% power) DUAL 26sec. 22sec.

M.LOW DEF 12sec. 20sec.

(approx. 30% power) DUAL 16sec. 32sec.

LOW DEF 6sec. 26sec.

(approx. 10% power) DUAL 8sec. 40sec.

DEF: Microwave cooking mode

GND

Pin No. Signal I/O Description

0.12 sec.

2.4 sec.

18 P50 OUT Grill heater driving signal.

To turn on and off the grill heater relay (RY4). "L" level during grill or dual cooking; "H" level otherwise.

During

cooking

(Grill or dual)

OFF

19 P47 OUT Signal to sound buzzer.

A: key touch sound. B: Completion sound.

During

cooking

(Convection)

OFF

20 P46 OUT Convection motor driving signal.

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

21-22 P45-P44 OUT Timing signal output terminal for temperature measurement(OVEN).

“H” level (GND) : Temperature measuring timing. (Convection cooking or dual cooking)

“L” level (-5V) : Thermistor OPEN timing. 23 P43 IN/OUT Memory data input/output. 24 P42 OUT Memory clock output. 25 INT1 IN Signal to synchronize LSI with commercial power

source frequency.

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

20 msec

26 INT0 IN Connected to GND. 27 RESET IN Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. Set to “L” level

the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.

28/29 P71/P70 IN/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-12 line keys on key matrix is touched, a corresponding signal from

P12, P11,P10,P07,P06 and P05 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-11 line keys 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-10 line keys 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-9 line keys on key matrix is touched, a corresponding signal will be

input into P24.

R-7N76(W)M R-7N76(B)M

GND

H : GND

L (-5V)

R-7N76(W)M R-7N76(B)M

Pin No. Signal I/O Description

37-42 P23-P16 OUT Digit selection signal.

The relation between digit signal and digit are as follows:

Digit signal digit

P23........................................... 1st.

P22.......................................... 2nd.

P21........................................... 3rd.

P20........................................... 4th.

P17........................................... 5th.

P16........................................... 6th.

Normally, one pulse is output in every ß period, and input to the Fluorescent Display.

43-45 P15-P13 OUT Segment data signals.

The relationship between signals and indicators are as follows:

Signal Segment Signal Segment

P15............... LB P06 ...................f

P14.............. UB P05 ..................g

P13................. a P04 .................. c

P12................. h P03 ..................e

P11...................j P02 ..................p

P10..................k P01 ..................n

P07................. b P00 ..................d

Refer to the touch control panel circuit for the relationship between signals and indicators. Normally, one pulse is output in every synchronized signal (ß) period, and input to the anode of the Fluorescent Display.

46 P12 OUT Segment data signal.

Signal similar to P15.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G3 line keys on key matrix is touched.

ß(50Hz)

P23

P22

P21

P20

P17

P16

GND VP

GND

47 P11 OUT Segment data signal.

Signal similar to P15.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G4 line keys on key matrix is touched.

48 P10 OUT Segment data signal.

Signal similar to P15.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G5 line keys on key matrix is touched.

49 P07 OUT Segment data signal.

Signal similar to P15.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G6 line keys on key matrix is touched.

50 P06 OUT Segment data signal.

Signal similar to P15.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G7 line keys on key matrix is touched.

51 P05 OUT Segment data signal.

Signal similar to P15.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G8 line keys on key matrix is touched.

R-7N76(W)M R-7N76(B)M

Pin No. Signal I/O Description

52-56 P04-P00 OUT Segment data signal.

Signal similar to P15. 57-59 P37-P35 OUT Terminal not used. 60-64 P34-P30 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

Memory IC (IC2)

X24C02P is a 2K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 256 registers x 8 bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2 are as shown in the following table.

Pin No. Signal I/O Description

1-3 A0-A2 IN Connected to VC (-5V).

4 VSS IN Connected to VC (-5V). 5 SDA IN/OUT Serial data input/output : input/outputs data to IC1. 6 SCL IN Clock signal input : input/outputs serial data at every one pulse. 7 TEST IN Connected to VC (-5V). 8 VCC IN Connected to GND.

R-7N76(W)M R-7N76(B)M

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 is in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.

Sensing part (Open vessel)

Sensing part (Closed vessel)

(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 itself heated at about 150˚C and 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 will be amplified by the operational amplifier.

Absolute humidity vs,

Operational amplifier

S : Thermistor

open vessel

C : Thermistor closed vessel

Output voltage

output voltage characterist

Absolute humidity (g/m )

unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the food is heated to

generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN6 terminal of the LSI. Then the LSI observes that voltage at AN6 terminal and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit get in the next necessary operation automatically.

When the LSI starts to detect the initial voltage at AN6 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is impossible to take a balance of the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will appear on the display and the cooking is stopped.

Absolute humidity sensor circuit

VC : -5V

P30

P31

P32

P33

P34

AN7

R C

LSI (IC1)

AN6

C. Thermistor in closed vessel S. Thermistor in open vessel

F-1

F-3

F-2

VA : -15V

R3 R4

R5 R6 R7

VA : -15V

R51

SW1

SW2

SW3

SW4

SW5

(3) Detector Circuit of Absolute Humidity Sensor

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 later the detector circuit starts to function and the LSI observes the initial voltage available at its AN6 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R-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

SERVICING

R-7N76(W)M R-7N76(B)M

1. Precautions for Handling Electronic Components

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

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

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

approx. 1M ohm

2. Shapes of Electronic Components

Transistor DTA143ES DTB143ES DTD143ES

Transistor 2SB910M

be separated from each other. For those models, therefore, check and repair all the controls (with the sensor-related ones included) of the touch control panel while keeping it in contact with the oven proper.

B. On some models, on the other hand, the power supply

cord between the touch control panel and the oven proper is so long that they may be separated from each other. For those models, therefore, it is allowed 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 stop switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the with the oven door being closed. As to the sensor-related controls of the touch control panel, their checking is allowed if the dummy resistor(s) whose resistance is equal to that of those 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 stop switch (on PWB) of the touch control panel, which brings about an operational state that is equivalent with the oven door being closed. And connect an external power source to the power input terminal of the touch control panel, and then it is allowed to check and repair the controls of the touch control panel; as in the case of (1)-B above, it is here also possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s).

3. Servicing of Touch Control Panel

We describe the procedures to permit servicing of the touch control panel of the microwave oven and the cautions you must considre when doing so. To carry the servicing, power supply to the touch control panel is available either from the power line of the oven proper itself of from an external power source.

(1)Servicing the touch control panel with power supply

from the oven proper: CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL ALIVE TO GIVE YOU DANGER DURING SERVICING.

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

A. On some models, the power supply cord between the touch

control panel and the oven proper is so short that they can’t

4. Servicing Tools

Tools required when servicing the touch control panel assembly.

1) Soldering iron: 30W (To prevent leaking current, 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 connectors of the indicator and key unit to the control unit taking care that the lead wires are not twisted.

3) After aluminium foil is removed, take extra care 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, taking care that all connections are tight.

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

R-7N76(W)M

PAD

DISPLAY INDICATOR PHONE

(T.O.D)

STOP/CLEAR

(Within 1 sec)

AUTO START/CLOCK

(Within 1 sec)

Kg / Lb

(Within 1 sec)

(T.O.D)

12H

LESS

(after 2 sec.)

1 . 1

STEP

1 2 3

R-7N76(B)M

SERVICE INFORMATION

AUTOMATIC GAIN SETTING FOR LOGICOOK

1. Set the gain of IC2 in no load condition each time after the following service action, referring to the Table 1 "How to set the gain". a) The control unit is replaced. b) The IC2 is replaced. c) The outer case cabinet is installed. d) The AH sensor is replaced. e) The sensor duct is replaced.

2. How to set the gain of IC2. 2-1. Assemble the microwave oven completely. 2-2. Clean the oven cavity, the waveguide cover, the

roller stay and the turntable tray. 2-3. Connect the oven to the power supply (240V,50Hz). 2-4. Operate the oven referring to the Table 1.

Note 1: Do not place any load into the oven cavity. Note 2: The oven should be cool.

(same as the room temperature)

Table 1. How to set the gain of IC2.

STEP PAD DISPLAY INDICATOR PHONE

(T.O.D)

12H

00000 17003

35034

COOK

HIGH

The oven  will start  cooking in  HIGH mode  for 2min.

1 2

AUTO START/CLOCK

3 4

TIMER/HOLD (after 60 sec)

STOP/CLEAR (Within 1 sec)

(Within 1 sec)

Kg / Lb

(Within 1 sec)

MANUAL GAIN SETTING FOR DRINK OF LOGICOOK

1. When, though the microwave oven or all parts are normal, food is undercooked or overcooked in DRINK of LOGICOOK mode, to improve the cooking result the gain can be reset in accordance with the following Table 2 or 3. When food is undercooked, decrease the gain referring to the Table 2. When food is overcooked, increase the gain referring to the Table 3.

Table 2. To set the cooking condition more.

( The gain is 1.0 now. )

STEP

1 2 3

PAD

STOP/CLEAR

(Within 1 sec)

AUTO START/CLOCK

(Within 1 sec)

Kg / Lb

(Within 1 sec)

DISPLAY INDICATOR PHONE

(T.O.D)

12H

0 . 9

(after 2 sec.)

(T.O.D)

Table 3. To set the cooking condition less.

( The gain is 1.0 now. )

(after 2min16sec)

STOP / CLEAR (T.O.D)

End

* 5 figures will continue to change their number. but not necessary to attend these number.

3. At the step 6 of the table 1. 3-1. When "ERROR" is displayed, the normal gain has

not been set. Check the fan motor, the fan duct, the sensor duct and ventilation openings first, to ensure the air flow. If they are normal, check the AH sensor. After necessary repair is carried out, set the gain of IC2 again.

3-2. When "End", "0.6" or "1.4" is displayed, the normal

gain has been set.

2. After setting the gain, check the LOGICOOK function in accordance with the following procedure;

1) Prepare two mug cups.

2) Fill each cup with 200 cc of water. (If possible milk is better than water)

3) Place them into the oven.

4) Operate the oven in DRINK of LOGICOOK mode.

5) Check the temperature of water (milk).

6) The temperature should become approximately 60 ~ 90˚C. If the temperature does not become as above, please set the other gain again.

NOTE : The gain can be usually set from 0.6 to 1.4 by 0.1.

R-7N76(W)M R-7N76(B)M

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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

the oven.

1. CARRY OUT

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;

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

3D CHECKS.

1. Door does not close firmly.

2. Door hinge, support or latch hook is damaged.

3. The door gasket or seal or 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.

OUTER CASE REMOVAL

To remove the outer case proceed as follows.

1. Disconnect oven from power supply.

2. Open the oven door and wedge it open.

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

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

5. Lift the entire case from the oven.

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

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

N.B.; Step 1, 2 and 6 form the basis of the 3D checks.

CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR

BEFORE TOUCHING ANY OVEN COMPONENT OR WIRING.

HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)

To remove the components, proceed as follows.

1. CARRY OUT 3D CHECKS

2. Disconnect all the leads and terminals of high voltage rectifier assembly from the high voltage capacitor.

3. Remove one (1) screw holding earth side terminal of high voltage rectifier assembly and remove capacitor holder.

4. Remove one (1) screw holding capacitor holder to oven cavity.

5. Release the capacitor holder from the duct.

HIGH VOLTAGE TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS

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

3. Disconnect the H.V. wire A from the high voltage transformer.

4. Disconnect the main wire harness from the high voltage

CONTROL PANEL REMOVAL

1. CARRY OUT 3D CHECKS

2. Disconnect the connectors from the control unit.

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

6. Remove the capacitor from the capacitor holder.

7. Now high voltage rectifier assembly and capacitor should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE

RECTIFIER ASSEMBLY, ENSURE THAT THE CATHODE (EARTH) CONNECTION IS SECURELY FIXED TO THE CAPACITOR HOLDER WITH AN EARTHING SCREW.

transformer.

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

8. Remove the transformer.

7. Now the high voltage transformer is free.

the oven cavity and remove the control panel.

4. Lift up the control panel assembly and pull it forward. Now the control panel assembly is free.

R-7N76(W)M R-7N76(B)M

MAGNETRON REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the air separate duct B from the chassis support and the air intake duct.

3. Disconnect the H.V. wire B and filament lead of the transformer from the magnetron.

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

5. Move the air intake duct to left.

6. Remove the air deflector from the magnetron.

7. Carefully remove four (4) screws holding magnetron to waveguide, when removing the screws hold the magnetron

FAN MOTOR REPLACEMENT

REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the one (1) screw holding the noise filter to the

chassis support.

3. Release the noise filter from the tabs of the fan duct.

4. Disconnect the wire leads from the fan duct.

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

to the oven cavity back plate.

6. Release the tabs of the capacitor holder from the fan

duct.

7. Remove the one (1) screw holding the fan duct to the

oven cavity back plate.

8. Remove the fan duct from the oven.

9. Remove the fan duct 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 groove joint pliers.

CAUTION:

• Make sure that any pieces do not enter the gap

between the rotor and the starter 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 and rotating the fan blade with your hand.

3) Now, the fan blade will be free.

CAUTION:

• Do not use this removed fan blade again.

Because the hole (for shaft) of it may become bigger than a standard one.

Coil

to prevent it from falling.

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

9. Remove the magnetron cushion from the magnetron.

CAUTION: WHEN REPLACING THE MAGNETRON, BE

SURE THE R.F. GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.

10. Remove the two (2) screws and two (2) nuts holding the

fan motor to the fan duct.

11. Now, the fan motor is free.

INSTALLATION

1. Install the fan motor to the fan duct with the two (2)

screws and two (2) nuts.

2. Install the fan blade to the fan motor shaft according the

following procedure.

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

of the fan motor on the flat table.

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

fan blade.

3) Install the fan blade to the shaft of fan motor by pushing

the fan blade with a small, light weight, ball peen hammer or rubber mallet.

CAUTION:

• Do not hit the fan blade strongly when installed because the bracket may be 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 oven cavity back plate with the one (1) screw.

4. Insert the tabs of the capacitor holder to the fan duct.

5. Install the capacitor holder to the oven cavity back plate with the one (1) screw.

6. Install the noise filter to the fan duct and the chassis support with the one (1) screw.

7. Re-connect the wire leads to the fan motor.

Shaft

Stator

Gap

Bracket

Rear view

Rotor

Groove joint pliers

Axis

Shaft

Stator

Rotor

Side view

These are the positions that should be pinched with pliers.

Table

Center of bracket

R-7N76(W)M

R-7N76(B)M

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 oven lamp socket.

4. Now, the oven lamp socket is free.

POSITIVE LOCK® CONNECTOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Pushing the lever of positive lock® connector.

3. Pull out the positive lock® connector.

CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-

NECT THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACE YOU (SERVICE ENGINEERS).

POWER SUPPLY CORD REPLACEMENT

Removal

1. CARRY OUT 3D CHECKS.

2. Remove the one (1) screw holding the green/yellow wire to the chassis support.

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

4. Release the power supply cord from the rear cabinet.

5. Now, the power supply cord is free.

OVEN CAVITY BACK PLATE

POWER SUPPLY CORD

OVEN LAMP SOCKE

TERMINAL HOLE

FLAT TYPE SMALL SCREW DRIVER

TERMINAL

WIRE LEAD

Figure C-1. Oven lamp socket

Terminal

Positive lock¤ connector

Lever

Push

Pull down

Figure C-2 Positive lock® connector

Re-install

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

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

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

POWER SUPPLY CORD

BROWN WIRE

BLUE WIRE

NOISE FILTER

CHASSIS SUPPORT

Figure C-3 (a) Replacement of Power Supply Cord

CONVECTION HEATING ELEMENT OR CONVECTION FAN MOTOR REMOVAL

1. CARRY OUT3DCHECKS.

2. Remove the four (4) screws holding the back plate to oven cavity.

3. Disconnect the wire leads from the convection heating element, convection motor and thermal cut-out.

4. Remove the three (3) screws holding the convection fan duct to the oven cavity from out-side.

5. Remove the six (6) screws holding the convection fan duct to the oven cavity.

GROMMET

MOULDING CORD STOPPER

Figure C-4(b). Power Supply Cord Replacement

MOULDING

OVEN CAVITY BACK PLATE

SQUARE HOLE

6. Now the convection fan duct is free.

CONVECTION HEATING ELEMENT

7. Remove the two (2) screws holding the convection air angle A and B to the convection fan duct.

8. Remove the two (2) screws holding the convection heating element to the convection fan duct.

9. Now, the convection heater is free.

R-7N76(W)M R-7N76(B)M

CONVECTION FAN MOTOR

7. Remove the one (1) nut holding the convection fan, washers, pipe and auxiliary fan to the convection fan motor shaft.

8. Remove the two (2) screws holding the convection motor

GRILL HEATING ELEMENT ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS

2. Disconnect the wire leads to the grill heating element.

3. Remove the two(2) screws holding the exhaust duct assembly to the oven cavity.

1ST. LATCH SWITCH, 2ND. LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the control panel assembly referring to "CONTROL PANEL REMOVAL".

3. Disconnect the leads from all switches.

4. Remove the two (2) screws holding the latch hook to the oven cavity.

5. Remove the latch hook.

6. Push the retaining tab slightly and remove the switch.

mounting plate to the convection fan duct.

9. Remove the pin on the convection fan motor shaft.

10.Remove the two (2) screws holding the convection motor mounting plate to the convection fan motor.

11.Now, the convection fan motor is free.

4. Push the two tabs holding the grill heating element assembly to the oven cavity.

5. Release the grill heating element assembly from the oven cavity by sliding the cover.

6. Now the grill heating element assembly is free.

2ND LATCH SWITCH

STOP SWITCH

TAB

MONITOR SWITCH

TAB

1ST LATCH SWITCH

Figure C-4. Switches

1ST LATCH SWITCH, 2ND LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT

If the 1st switch, 2nd latch switch, stop switch and monitor switch do not operate properly due to a mis-adjustment, the following adjustment should be made.

1. CARRY OUT 3D CHECKS

2. Loosen the one (1) screw holding the upper latch hook to the oven cavity front flange and the one (1) screw holding the lower latch hook to the same flange.

3. With the door closed, adjust latch hook by moving it back and forward or up and down. In and out play of the door allowed by the latch hook should be less than 0.5 mm. The horizontal position of the latch hook should be placed where the latch head has pushed the plungers of the monitor switch and 2nd. latch switch with the door closed. The vertical position of the latch hook should be placed where the latch head has pushed the plungers of the 1st. latch switch and stop switch with the door closed and the start button pushed.

4. Secure the screws with washers firmly.

5. Make sure of the all switches operation. If the latch head has not pushed the plungers of the monitor switch and 2nd. latch switch with door closed, adjust the latch hook position.

At that time, the latch head should not have pushed the plungers of the 1st. switch and stop switch. If the latch head has not pushed the plungers of the 1st. switch and stop switch with door closed, loose two (2) screws holding latch hook to oven cavity front flange and adjust the latch hook position.

Then check the lower latch hook position, pushing and pulling lower portion of door toward the oven face. Both results (plays of the door) should be less than 0.5mm.

2. The 1st latch switch and stop switch interrupt the circuit before the door can be opened.

3. The monitor switch contacts of (COM.- NC.) close when the door is opened and the 2nd latch switch contacts of (COM.- NO.) open when the door is opened.

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

LATCH HOOK

LATCH HEADS

2ND LATCH SWITCH

STOP SWITCH

MONITOR LATCH SWITCH

1ST LATCH SWITCH

OPEN LEVER

After adjustment, make sure of the following:

1. In and out play of door remains less than 0.5 mm when latched position. First check latch hook position, pushing and pulling upper portion of door toward the oven face.

DOOR OPEN BUTTON

Figure C-5. Switch Adjustment

DOOR REPLACEMENT AND ADJUSTMENT

R-7N76(W)M R-7N76(B)M

REPLACEMENT

1. CARRY OUT 3D CHECKS

2. Remove three (3) screws holding the lower oven hinge to the oven cavity.

3. Remove door assembly with lower oven hinge by pulling it downward.

4. Separate the door assembly and lower oven hinge. Door assembly is now free.

5. Re-install lower oven hinge to the new door assembly.

6. On re-installing new door assembly, secure the lower oven hinge with the three (3) mounting screws to the oven cavity. Make sure the door is parallel with bottom line of the oven face plate and the latch head pass through the latch holes correctly.

7. CARRY OUT 4R CHECKS

Note: After any service to the door, the approved microwave

survey meter should be used to assure in compliance with proper microwave radiation standards. (Refer to Microwave Measurement Procedure.)

ADJUSTMENT

When removing and/or loosening hinges such as in door replacement, the following adjustment criteria are taken. Door is adjusted to meet the following three conditions by keeping screws of hinge loose.

1. Adjust door latch heads at a position where they smoothly catch the latch hook through the latch holes. Refer to latch switch adjustments.

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

OUTER CASE CABINET

DOOR ASSEMBLY

LATCH HEADS

RE-INSTALL

SCREWS

Figure C-6. Door Assembly Replacement and Adjustment

DOOR PARTS REMOVAL

CHOKE COVER REMOVAL

1. Insert an iron plate (thickness of about 0.5mm) or flat type screw driver to the gap between the choke cover and door panel as shown figure to free the engaging part. The protect sheet may be used not to damage the door panel.

2. Lift up the choke cover, now choke cove is free.

FLAT TYPE SCREW-DRIVER

PROTECT BY TAPE

FLAT TYPE SCREW-DRIVER

DOOR FRAME AND GLASS REMOVAL

Remove the door assembly, referring to from item 1 through item 4 of “DOOR REPLACEMENT”.

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

2. Remove the choke cover, referring to “CHOKE COVER REMOVAL”.

3. Remove the four (4) screws holding the door frame to the door panel assembly.

4. Release the glass stopper from the door frame.

5. Remove the door glass from the door frame.

6. Remove the door frame from the door panel by releasing the three (3) tabs of door frame from door panel with flat type screw driver

7. Lift up the door glass, now the door glass is free.

LATCH HEAD REMOVAL

1. Remove the door frame referring to "DOOR FRAME and GLASS REMOVAL".

2. Release the latch spring from the tabs of the door panel.

3. Release the latch spring from the latch head.

4. Release the latch head from the door panel.

5. Now, the latch head is free.

CHOKE COVER

Figure C-8. Choke Cover Removal

DOOR PANEL

R-7N76(W)M R-7N76(B)M

MICROW AVE 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/cm2 at any point 5cm or more from external surface of the oven.

PREPARATION FOR TESTING:

Before beginning the actual test for leakage, proceed as follows;

1. Make sure that the test instrument is operating normally as specified in its instruction booklet.

Important: Survey instruments that comply with the requirement

for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing.

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.

SHA

Microwave leakage measurement at 5 cm distance

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

NOISE

FILTER

FUSE

M8A

FUSE 13A

10M / 0.5W

220–230V~50Hz

600K / 0.5W

0.22µ / 250V

EARTH

G–Y / 15

BLU / 15 BRN / 15

NOISE SUPPRESSION COIL

0.0047µ / 250V 0.0047µ / 250V

MONITOR SWITCH

MONITOR

RESISTOR

0.8 / 20W

THERMAL

CUT-OUT

170°C (OVEN)

1ST LATCH SWITCH

N.C

R-7N76(W)M R-7N76(B)M

THERMAL

CUT-OUT

THERMAL

CUT-OUT

190°C

(CONV.)

N.O

COM

H6 H7

RY3

RY2

STOP

SWITCH

N.O

RY5

N.O

DAMPER

SWITCH

2ND

COM

N.O

RY1RY4RY6

RY7

LATCH

THER-

SWITCH

F1 F2 F3

A5A7A9

MISTOR

SENSOR

OVEN LAMP

DAMPER MOTOR

CFM

FAN MOTOR

125°C (MG.)

TURNTABLE MOTOR

TTM

TTM SWITCH

GRILL HEATING ELEMENT

CONVECTION FAN MOTOR

CH: CONVECTION HEATING ELEMENT

* HIGH VOLTAGE TRANSFORMER

* CAPACITOR

1.2µ

AC2100V

* ASYMMETRIC

RECTIFIER

* MAGNETRON

* H.V. RECTIFIER

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. MICROWAVE PAD TOUCHED ONCE.

4. STARTPAD TOUCHED.

NOISE

FILTER

FUSE 13A

10M / 0.5W

220–230V~50Hz

600K / 0.5W

0.22µ / 250V

EARTH

G–Y / 15

BLU / 15 BRN / 15

NOISE SUPPRESSION COIL

0.0047µ / 250V 0.0047µ / 250V

Figure O-1 Oven Schematic-OFF Condition

NOTE: * Indicates components with potentials above 250V.

1ST LATCH SWITCH

THERMAL

CUT-OUT

FUSE

M8A

THERMAL

N.C

MONITOR SWITCH

MONITOR

RESISTOR

0.8 / 20W

CUT-OUT

170°C (OVEN)

THERMAL

CUT-OUT

190°C

OVEN LAMP

(CONV.)

SENSOR

FAN MOTOR

DAMPER MOTOR

H6 H7

COM

RY2

COM

STOP

COM

RY3

SWITCH

N.O

RY5

N.O

DAMPER

SWITCH

2ND

COM

N.O

RY1RY4RY6

RY7

LATCH

SWITCH

THER-

MISTOR

A5A7A9

F1 F2 F3

125°C (MG.)

CFM

GH: GRILL HEATING ELEMENT

CONVECTION FAN MOTOR

TURNTABLE MOTOR

* HIGH VOLTAGE TRANSFORMER

TTM

* CAPACITOR

1.2µ

AC2100V

TTM SWITCH

CH: CONVECTION HEATING ELEMENT

* ASYMMETRIC

RECTIFIER

* MAGNETRON

* H.V. RECTIFIER

Figure O-2 Oven Schematic-Microwave Cooking Condition

R-7N76(W)M R-7N76(B)M

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. CONVECTION PAD TOUCHED UNTIL THE DESIRED TEMPERATURE APPEAR ON DISPLAY

4. START PAD TOUCHED.

NOISE

FILTER

FUSE

M8A

FUSE 13A

10M / 0.5W

220–230V~50Hz

600K / 0.5W

0.22µ / 250V

EARTH

G–Y / 15

BLU / 15 BRN / 15

NOISE SUPPRESSION COIL

0.0047µ / 250V 0.0047µ / 250V

MONITOR SWITCH

MONITOR

RESISTOR

0.8 / 20W

THERMAL

CUT-OUT

170°C (OVEN)

1ST LATCH SWITCH

N.C

THERMAL

CUT-OUT

THERMAL

CUT-OUT

190°C

(CONV.)

N.O

COM

H6 H7

RY3

RY2

STOP

SWITCH

RY5

N.O

DAMPER

SWITCH

2ND

COM

N.O

RY1RY4RY6

RY7

LATCH

SWITCH

F1 F2 F3

A5A7A9

THER-

MISTOR

OVEN LAMP

SENSOR

FAN MOTOR

DAMPER MOTOR

CFM

125°C (MG.)

TURNTABLE MOTOR

TTM

TTM SWITCH

GRILL HEATING ELEMENT

CONVECTION FAN MOTOR

CH: CONVECTION HEATING ELEMENT

* HIGH VOLTAGE TRANSFORMER

* CAPACITOR

1.2µ

AC2100V

* ASYMMETRIC

RECTIFIER

* MAGNETRON

* H.V. RECTIFIER

Figure O-3 Oven Schematic-Convection Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. GRILL PAD TOUCHED

4. START PAD TOUCHED.

FUSE 13A

10M / 0.5W

220–230V~50Hz

600K / 0.5W

0.22µ / 250V

EARTH

G–Y / 15

BLU / 15 BRN / 15

NOISE SUPPRESSION COIL

NOISE

FILTER

FUSE

M8A

0.0047µ / 250V 0.0047µ / 250V

NOTE: * Indicates components with potentials above 250V.

1ST LATCH SWITCH

THERMAL

CUT-OUT

125°C (MG.)

THERMAL

CUT-OUT

190°C

OVEN LAMP

(CONV.)

SENSOR

FAN MOTOR

DAMPER MOTOR

CFM

TURNTABLE MOTOR

TTM

TTM SWITCH

GRILL HEATING ELEMENT

CONVECTION FAN MOTOR

CH: CONVECTION HEATING ELEMENT

MONITOR SWITCH

MONITOR

RESISTOR

0.8 / 20W

THERMAL

CUT-OUT

170°C (OVEN)

N.C

H6 H7

N.O

COM

RY3

RY2

STOP

SWITCH

RY5

N.O

DAMPER

SWITCH

2ND

COM

N.O

RY1RY4RY6

RY7

LATCH

SWITCH

F1 F2 F3

A5A7A9

THER-

MISTOR

* HIGH VOLTAGE TRANSFORMER

* CAPACITOR

1.2µ

AC2100V

* ASYMMETRIC

RECTIFIER

* MAGNETRON

* H.V. RECTIFIER

Figure O-4 Oven Schematic-Grill Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. DUAL COOK PAD TOUCHED ONCE OR TWICE.

4. START PAD TOUCHED.

NOISE

FILTER

FUSE

M8A

FUSE 13A

10M / 0.5W

220–230V~50Hz

G–Y / 15

BLU / 15 BRN / 15

0.22µ / 250V

EARTH

NOISE SUPPRESSION COIL

600K / 0.5W

0.0047µ / 250V 0.0047µ / 250V

MONITOR SWITCH

MONITOR

RESISTOR

0.8 / 20W

THERMAL

CUT-OUT

170°C (OVEN)

1ST LATCH SWITCH

N.C

R-7N76(W)M R-7N76(B)M

THERMAL

CUT-OUT

125°C (MG.)

THERMAL

CUT-OUT

190°C

(CONV.)

N.O

COM

H6 H7

RY3

RY2

STOP

SWITCH

RY5

N.O

DAMPER

SWITCH

2ND

COM

N.O

RY1RY4RY6

RY7

LATCH

SWITCH

F1 F2 F3

A5A7A9

THER-

MISTOR

OVEN LAMP

SENSOR

FAN MOTOR

DAMPER MOTOR

CFM

TURNTABLE MOTOR

TTM

TTM SWITCH

GH: GRILL HEATING ELEMENT

CONVECTION FAN MOTOR

CH: CONVECTION HEATING ELEMENT

* HIGH VOLTAGE TRANSFORMER

* CAPACITOR

1.2µ

AC2100V

* ASYMMETRIC

RECTIFIER

* MAGNETRON

* H.V. RECTIFIER

Figure O-5. Oven Schematic-Dual Cooking (Roast / Bake) Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. DUAL COOK PAD TOUCHED THREE TIMES.

4. START PAD TOUCHED.

NOISE

FILTER

FUSE

M8A

FUSE 13A

10M / 0.5W

220–230V~50Hz

600K / 0.5W

0.22µ / 250V

EARTH

G–Y / 15

BLU / 15 BRN / 15

NOISE SUPPRESSION COIL

0.0047µ / 250V 0.0047µ / 250V

MONITOR

RESISTOR

THERMAL

CUT-OUT

1ST LATCH SWITCH

N.C

MONITOR SWITCH

0.8 / 20W

170°C (OVEN)

NOTE: * Indicates components with potentials above 250V.

THERMAL

CUT-OUT

125°C (MG.)

THERMAL

CUT-OUT

190°C

SENSOR

OVEN LAMP

DAMPER MOTOR

(CONV.)

CFM

FAN MOTOR

GH: GRILL HEATING ELEMENT

CONVECTION FAN MOTOR

CH: CONVECTION HEATING ELEMENT

TURNTABLE MOTOR

* HIGH VOLTAGE TRANSFORMER

TTM

TTM SWITCH

* CAPACITOR

1.2µ

AC2100V

* ASYMMETRIC

RECTIFIER

H6 H7

COM

RY2

COM

RY3

STOP

SWITCH

N.O

COM

N.O

RY1RY4RY6

SWITCH

2ND

LATCH

RY7

SWITCH

F1 F2 F3

A5A7A9

THER-

MISTOR

N.O

RY5

DAMPER

* MAGNETRON

* H.V. RECTIFIER

Figure O-6 Oven SchematicDual Cooking (Microwave and Grill) Condition

ORG

YLW

GRY

RED

BRN

BLU 1

CN-H

TC TRANSFORMER

CN-A

BRN

1ST LATCH

SWITCH

ORG

RED

BLU 1

GRY

COM

Figure S-1. Pictorial Diagram

ORG

BLK

COM

ORG

BLK

CN-A

RY2

COM

ORG

13579

1 3 5678

CN-H

COM

RY1

ORG

BLK

COM

BLK

ORG

RED

MONITOR SWITCH

BLK

THERMAL

CUT-OUT

125°C(MG)

RY3

BRN

COM

ORG

RED

RY4

YLW

COM

RED

GRN

CN-F

65432

GRN

CN-B

BRN 6

BRN

BLU

STOP SWITCH

BLK

4.3 20W

CN-B

MONITOR

RESISTOR

CONTROL PANEL

RED

WHT

2ND

LATCH

SWITCH

COM

BLU

GRILL HEATING

ELEMENT

BLK

AH SENSOR

WHT

BLU

WHT

BLU

RED

BLU

T: HIGH VOLTAGE

TRANSFORMER

H.V.

RECTIFIER

C: H.V.

ASYMMETRIC

RECTIFIER

CAPACITOR

H.V.WIRE B

MG:

MAGNETRON

H.V.WIRE A

WHT

ORG

BLK

TTM

HIGH VOLTAGE COMPONENTS

SWITCH

FAN MOTOR

BRN

BLU

RED

BLU

TURNTABLE

MOTOR

WHT

BRN

WHT

BLU

(CONV.)

BRN

THERMISTOR

WHT

BRN

THERMAL

CUT-OUT

190°C

ORG

BLU

CONVECTION

ELEMENT

HEATING

ORG

WHT

CONV.FAN

MOTOR

BLU

3 RED

ORG W

G–Y

GRY

BRN

BLK1

FUSE M8A

RED WHT

NOISE

FILTER

POWER

SUPPLY

CORD

BLU

YLW

DAMPER

MOTOR

WHT

COM

FUSE

13A

BRN

CUT-OUT

70°C

(OVEN)

WHT

BLK

DAMPER

SWITCH

THERMAL

WHT

OVEN LAMP

& SOCKET

WHT

R-7N76(B)M R-7N76(W)M

HEATER

GRILL HEATER

TRANSFORMER

CONVECTION

HIGH

VOLTAGE

OVEN LAMP

TURNTABLE

MOTOR

DAMPER

MOTOR

FAN MOTOR

CONVECTION

AC240V

50Hz

COM

RY4

COM

R24 47

COM

RY3

R23 47

D22D23D24

DTA143ES x 2

Q24

Q23

Q22

DTB143ES

D29

Figure S-2. Control Panel Circuit

SWITCH

DAMPER

SWITCH

THERMISTOR

R81 5.1K

OVEN

5.1K

R31

R60 91KF

R80

1.5K

100F

R61

R30

1.5K

C80 C60

R62 2.7KF

D30

DOOR

C30

C50 47µ/25V

CF1

A0 A1 A2

RY2

R22 47

C20 10µ /35V

C51

X24C02P

VCC

IC2

TEST SCL SDAVSS

COM

R21 47

Q20

DTA143ES

R51 15K

Q21

DTD143ES

R50

150

R53 2.7K

R52 15K

RY1

0.1µ/50V

D28

Q25~Q27

DTA143ES

C21

RY7

Q27

RY6

Q26

Q40

DTA143ES

D25D26D27D21

(J8) (J6) (J4) (J7) (J5) (J3)

RY5

Q25

DTA143ES

R40 3.3K

SP40

Q10

C10

0.1µ /50V

R3 680 1W

510 1/2W

R10 15K

C11

(J1)

HZ6A3

2SB910M

R2 2.4K

HZ4A2

R5 15K

VRS1

abcd

S1NB10

C1 0.1µ/50V

C2 1000µ/50V

ZD1

4.3K 1/2W

ZD2 HZ16-1

C3 47µ/25V

C4 0.1µ/50V

ZD3 HZ5C2

C5 47µ/25V

ZD4

H3H1

H5 H6

DTA143ES

/50V

H8H7

CONTROL UNIT

0.1µ

AH SENSOR

(A) (B) (C)

F3F2F1C6C5C4C3C2C1

KEY UNIT

C90 47µ/25V

C91

G12

G11

/CLEAR

POWER

STOP

LEVEL

TIMER

/HOLD

MINUTE

/START

COOK

AUTO

LOGICOOK

DEFROST

DRINK

AUTO

LOGICOOK

SEC.

FOOD

CONVECTION

TEMP

/GRILL

TION

DUAL

G10

MICROWAVE

AUTO

START

AUTO

g • oz

MIN.

CONVEC

GRILL

LESS

Kg • LbKg / Lb

MIN.

330pF x 4

C70

R73 R72 R71 R70

G8 G1G2G3G4G5G6G7

D78

D77

D76

D75

D74

D73

15K 15K 15K 15K

VSS

32 33

RESET

XOUT

INT1

INT0

P42

P71

P70

XIN

P22

P23

P24

P25

P26

P27

P17

P20

P21

P51

P50

P47

P46

P45

P44

P43

IC1 IZA627DR

P10

P11

P12

P13

P14

P15

P16

AN2

AN1

AN0

P55

P54

P53

P52

P01

P02

P03

P04

P05

P06

P07

AN3

P00

AN4

P37

AN5

P36

AN6

P35

AVSS

VREF

VCC

VEE

AN7

P30

P31

P32

P33

P34

IC3 IZA495DR

(C)

(A)(B)

R90 330

121110987654321

COOK

AUTO

SENSOR

DEFROST

2625,

Lbs Pcs Kg Oz

4 21,

FLUORESCENT DISPLAY TUBE

CONV GRILL MED LOW HIGH

Note :

IF NOT SPECIFIED, 1SS270A

IF NOT SPECIFIED, 0.01µF / 16V

IF NOT SPECIFIED, 1/4W ± 5%

R-7N76(B)M R-7N76(W)M

R-7N76(W)M R-7N76(B)M

Figure S-3. Printed Wiring Board

PARTS LIST

Note: The parts marked "∆" may cause undue microwave exposure. / The parts marked "*" are used in voltage more than 250V. / "§" Mark: Spare parts delivery section

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

ELECTRIC PARTS

1- 1 FH-HZA007WRE0 U Thermistor 1 AH 1- 2 RTRN-A402WRE0 J TC transformer 1 AW 1- 3 QACCBA033WRE1 U Power supply cord assembly 1 AT 1- 4 FH-DZA035WRE0 U High voltage rectifier assembly 1 AP

1- 5 FPWBFA242WRE0 U Noise filter 1 AW 1- 6 RC-QZA075WRE0 U High voltage capacitor 1 AX

1- 7 QSOCLA011WRE0 J Oven lamp socket 1 AH 1- 8 RHET-A120WRE1 U Convection heating element 1 AX 1- 9 RMOTEA289WRE0 U Convection motor 1 AW 1-10 QFS-CA009WRE0 J Fuse 13A 1 AD 1-11 QFS-CA010WRE0 J Fuse M8A 1 AE 1-12 RMOTEA279WRE0 U Fan motor 1 AT 1-13 FHET-A048WRK0 U Grill heating element assembly 1 BB 1-14 RV-MZA177WRE0 U Magnetron 1 BG

∆

1-15 RLMPTA058WRE0 U Oven lamp 1 AG 1-16 RR-WZA003WRE0 J Monitor resistor 0.8Ω 1AG 1-17 QSW-MA110WRE0 J 1st latch switch 1 AK 1-18 QSW-MA110WRE0 J 2nd latch switch 1 AK 1-19 QSW-MA110WRE0 J Stop switch 1 AK 1-20 QSW-MA111WRE0 U Monitor switch 1 AK 1-21 QSW-MA110WRE0 J Damper switch 1 AK 1-22 RTRN-A418WRE0 U High voltage transformer 1 BP

1-23 RTHM-A084WRE0 U Thermal cut-out 170˚C (OVEN) 1 AL 1-24 RTHM-A078WRE0 U Thermal cut-out 125˚C (MG) 1 AL 1-25 RTHM-A004WRE0 U Thermal cut out 190˚C (CONV.) 1 AL 1-26 RMOTDA183WRE0 U Damper motor 1 AV 1-27 FMOTDA057WRK0 J Turntable motor assembly 1 AR 1-28 FDTCTA150WRK0 J AH Sensor 1 AX

CABINET PARTS

2- 1 GCABDA064WRP0 U Back plate 1 AP 2- 2 GCABDA065WRP0 U Sub back plate 1 AH 2- 3 GCABUA445WRP0 U Outer case cabinet (Brown) 1 AX 2- 3 GCABUA469WRT0 U Outer case cabinet (White) 1 AX

∆

2- 4 MHNG-A325WRM0 U Lower oven hinge 1 AC 2- 5 GDAI-A219WRP3 U Base plate 1 AS 2- 6 GLEGPA028WRE0 U Foot 4 AA

CONTROL PANEL PARTS

3- 1 CPWBFA633WRK0 J Control unit 1 BR 3- 1A QCNCMA227DRE0 J 5-pin connector (A) 1 AC 3- 1B QCNCMA237DRE0 J 3-pin connector (F) 1 AD 3- 1C QCNCMA267DRE0 J 6-pin connector (C) 1 AC 3- 1D QCNCMA346DRE0 J 6-pin connector (H) 1 AG 3- 1E QCNCWA057DRE0 J 12-pin connector (G) 1 AF 3- 1F RV-KXA062DRE0 J Fluorescent display tube 1 BA C1 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB C2 RC-EZA238DRE0 J Capacitor 1000 uF 35V 1 AD C3 RC-EZA301DRE0 J Capacitor 47 uF 25V 1 AB C4 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB C5 RC-EZA301DRE0 J Capacitor 47 uF 25V 1 AB C6-7 VCKYD11CY103N J Capacitor 0.01 uF 16V 2 AH C8 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB C10 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB C11 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C20 RC-EZA322DRE0 J Capacitor 10 uF 35V 1 AC C21 RC-EZA302DRE0 J Capacitor 0.1 uF 50V 1 AM C30 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C50 RC-EZA301DRE0 J Capacitor 47 uF 25V 1 AB C51 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C60 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C70 RMPTEA009DRE0 J CR array (330pF x 4) 1 AE C80 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C90 RC-EZA301DRE0 J Capacitor 47 uF 25V 1 AB C91 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH CF1 RCRS-A012DRE0 J Ceramic resonator (CST4.00MGW) 1 AD D1 RSRCDA013DRE0 J Diode (S1NB10) 1 AG

R-7N76(W)M R-7N76(B)M

Note: The parts marked "∆" may cause undue microwave exposure. / The parts marked "*" are used in voltage more than 250V. / "§" Mark: Spare parts delivery section

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

D21-30 VHD1SS270A/-1 J Diode (1SS270ATA) 10 AA D73-78 VHD1SS270A/-1 J Diode (1SS270ATA) 6 AA IC1 RH-IZA627DRE0 J LSI 1 AS IC2 RH-IZA521DRE0 J IC (X24C02P) 1 AL IC3 RH-IZA495DRE0 J IC 1 AL Q1 VS2SB910MR/-4 J Transistor (2SB910M) 1 AE Q4 VSDTA143ES/1B J Transistor (DTA143ES) 1 AB Q10 VSDTA143ES/1B J Transistor (DTA143ES) 1 AB Q20 VSDTA143ES/1B J Transistor (DTA143ES) 1 AB Q21 VSDTD143ES/-3 J Transistor (DTD143ES) 1 AC Q22 VSDTB143ES/-3 J Transistor (DTB143ES) 1 AC Q23-27 VSDTA143ES/1B J Transistor (DTA143ES) 5 AB Q40 VSDTA143ES/1B J Transistor (DTA143ES) 1 AB R1 VRD-B12HF432J J Resistor 4.3k ohm 1/2W 1 AH R2 VRD-B12EF242J J Resistor 2.4k ohm 1/4W 1 AA R3 VRS-B13AA681J J Resistor 680 ohm 1W 1 AA R4 VRD-B12HF511J J Resistor 510 ohm 1/2W 1 AB R5 VRD-B12EF153J J Resistor 15k ohm 1/4W 1 AA R10 VRD-B12EF153J J Resistor 15k ohm 1/4W 1 AA R21-24 VRD-B12EF470J J Resistor 47 ohm 1/4W 4 AB R30 VRD-B12EF152J J Resistor 1.5k ohm 1/4W 1 AA R31 VRD-B12EF512J J Resistor 5.1k ohm 1/4W 1 AA R40 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 1 AA R50 VRD-B12EF151J J Resistor 150 ohm 1/4W 1 AA R51-52 VRD-B12EF153J J Resistor 15k ohm 1/4W 2 AA R53 VRD-B12EF272J J Resistor 2.7k ohm 1/4W 1 AA R60 VRN-B12EK913F J Resistor 91k ohm 1/4W 1 AA R61 VRN-B12EK101F J Resistor 100 ohm 1/4W 1 AA R62 VRN-B12EK272F J Resistor 2.7k ohm 1/4W 1 AA R70-73 VRD-B12EF153J J Resistor 15k ohm 1/4W 4 AA R80 VRD-B12EF152J J Resistor 1.5k ohm 1/4W 1 AA R81 VRD-B12EF512J J Resistor 5.1k ohm 1/4W 1 AA R90 VRS-B13AA331J J Resistor 330 ohm 1W 1 AA RY1 RRLY-A076DRE0 J Relay (OMIF-S-124LM) 1 AK RY2 RRLY-A081DRE0 J Relay (VRB24) 1 AL RY3-4 RRLY-A076DRE0 J Relay (OMIF-S-124LM) 2 AK RY5-7 RRLY-A080DRE0 J Relay (OJ-SH-124LM) 2 AG SP40 RALM-A014DRE0 J Buzzer (PKM22EPT) 1 AG VRS1 RH-VZA032DRE0 J Varistor (10G471K) 1 AE ZD1 VHEHZ6A3///-1 J Zener diode (HZ6A3) 1 AA ZD2 VHEHZ161///-1 J Zener diode (HZ16-1) 1 AA ZD3 VHEHZ5C2///-1 J Zener diode (HZ5C2) 1 AA ZD4 VHEHZ4A2///-1 J Zener diode (HZ4A2) 1 AA 3- 2 DUNTKA654WRK0 J Key unit assembly [R-7N76(B)M] 1 BA 3- 2 DUNTKA655WRK0 J Key unit assembly [R-7N76(W)M] 1 BA 3- 2-1 FUNTKA666WRE0 J Key unit [R-7N76(B)M] 1 AZ 3- 2-1 FUNTKA667WRE0 J Key unit [R-7N76(W)M] 1 AZ 3- 3 HPNLCB147WRF0 U Control panel [R-7N76(B)M] 1 AM 3- 3 HPNLCB148WRF0 U Control panel [R-7N76(W)M] 1 AM

∆

3- 4 GMADIA082WRF0 U Display window 1 AD 3- 5 JBTN-A871WRF0 U Open button [R-7N76(B)M] 1 AD 3- 5 JBTN-A872WRF0 U Open button [R-7N76(W)M] 1 AD 3- 6 MSPRCA045WRE0 U Open button spring 1 AA 3- 7 XEPSD30P10XS0 J Screw 4 AA 3- 8 XCPSD30P08X00 J Screw 1 AA

OVEN PARTS

4- 1 DOVN-A418WRK0 U Oven cavity 1 BP 4- 2 LBNDKA089WRP0 U Capacitor holder 1 AE 4- 3 FDUC-A280WRK0 U Exhaust duct assembly 1 AR 4- 4 PSLDHA112WRP1 U Heater cover R 1 AL 4- 5 LANGQA308WRP0 U Convection motor mounting plate 1 AE

∆

4- 6 NFANMA011WRP0 J Convection fan 1 AD 4- 7 FFANMA014WRY0 U Cooling fan assembly 1 AF 4- 8 FDUC-A261WRK0 U Convection duct assembly 1 AP 4- 9 PFPF-A171WRE1 U Rear heat intercept 1 AK 4-10 PPIPFA013WRE0 U Pipe 1 AE 4-11 PSKR-A268WRP0 U Conv. air angle A 1 AD 4-12 PSKR-A269WRP0 U Conv. air angle B 1 AD

∆

4-13 FSLDHA017WRK2 U Rear heat cover 1 AP

Note: The parts marked "∆" may cause undue microwave exposure. / The parts marked "*" are used in voltage more than 250V. / "§" Mark: Spare parts delivery section

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

4-14 PHOK-A078WRF3 U Latch hook 1 AH 4-15 FFANJA042WRK0 U Fan blade assembly 1 AE 4-16 PDUC-A503WRF2 U Fan duct 1 AK 4-17 GCOVHA312WRP1 U Bottom heat cover 1 AH 4-18 LANGFA155WRP5 U Chassis support 1 AF 4-19 LANGQA385WRP1 U Lamp mounting angle 1 AF 4-20 LANGQA350WRP1 U TTM support angle 1 AC 4-21 MHNG-A324WRM1 U Upper oven hinge 1 AD 4-22 MLEVFA074WRF3 U Open lever 1 AD

4-23 PPACGA108WRE0 U Packing 1 AC 4-24 PFTA-A023WRP0 U Damper 1 AE 4-25 NCPL-A043WRF0 U Coupling 1 AE 4-26 NSFTTA107WRE1 U Damper shaft 1 AQ 4-27 PCOVPA263WRE0 U Waveguide cover 1 AD 4-28 PSPAGA001WRE0 U HVT cushion 1 AA 4-29 PFPF-A177WRE1 U Heater intercept R 1 AK 4-30 PCUSUA346WRP0 U Cushion 1 AA 4-31 PCUSUA379WRP0 U Damper cushion 1 AC 4-32 PCUSUA380WRP0 U Heater cushion 1 AA 4-33 PCUSUA381WRP0 U Cushion 2 AA 4-34 PDUC-A560WRF0 U Air separate duct B 1 AF 4-35 PDUC-A540WRF2 U Air intake duct 1 AG 4-36 PDUC-A543WRP0 U Air duct 1 AH 4-37 PFILWA042WRP0 U Lamp filter 1 AB 4-38 LANGQA386WRP0 U Thermistor angle 1 AE

∆

4-39 MCAMPA076WRF1 U Damper cam 1 AB

∆

4-40 LANGTA305WRP0 U Air separate angle 1 AF

∆

4-41 PCUSUA398WRP0 U Cushion 2 AA 4-42 PCUSUA403WRP0 U Cushion 1 AA 4-43 PCUSGA313WRP0 U Cushion 1 AB 4-44 PSHT-A008WRE0 U Sensor sheet 1 AC

∆

DOOR PARTS

5 CDORFA683WRK0 U Door assembly (Brown) 1 BM 5 CDORFA684WRK0 U Door assembly (White) 1 BM 5- 1 DDORFA659WRY0 J Door panel assembly 1 AY 5- 2 GCOVHA304WRF0 U Choke cover 1 AH 5- 3 GWAKPA296WRF0 U Door frame (Brown) 1 AT 5- 3 GWAKPA297WRF0 U Door frame (White) 1 AT 5- 4 LSTPPA124WRF2 U Latch head 1 AE 5- 5 MSPRTA172WRE0 U Latch spring 1 AA 5- 6 HPNL-A627WRR0 U Front door glass (Brown) 1 AY 5- 6 HPNL-A626WRR0 U Front door glass (White) 1 AY

5- 7 XEPSD30P06000 J Screw : 3mm x 6mm 6 AA

5- 8 LSTPPA127WRF0 U Glass stopper (Brown) 1 AC 5- 8 LSTPPA128WRF0 U Glass stopper (White) 1 AC 5-9 PCUSGA434WRE0 U Door cushion L 2 AE 5-10 PCUSGA435WRE0 U Door cushion S 2 AD

MISCELLANEOUS

6- 1 FAMI-A072WRK1 U High rack 1 AY 6- 2 FAMI-A075WRK1 U Low rack 1 AY 6- 3 FROLPA063WRK2 U Roller stay 1 BA 6- 4 NTNU-A069WRE0 U Turntable tray 1 BA 6- 5 FW-VZB278WRE0 U Thermistor harness 1 AP 6- 6 QW-QZA175WRE0 U High voltage wire A 1 AE 6- 7 QW-QZA176WRE0 U High voltage wire B 1 AE 6- 8 FW-VZB288WRE0 U Main harness 1 AX 6- 9 TCADCA550WRR0 U Cook book 1 AM 6-10 TINS-A500WRR0 U Operation manual 1 AH 6-11 TCAUHA001WRR0 U Caution label 1 AB 6-12 TLABMA423WRR1 U Menu label 1 AF

R-7N76(W)M R-7N76(B)M

Note: The parts marked "∆" may cause undue microwave exposure. / The parts marked "*" are used in voltage more than 250V. / "§" Mark: Spare parts delivery section

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

SCREWS,NUTS AND WASHERS

7- 1 XHPSD40P08K00 J Screw : 4mm x 8mm 1 AA 7- 2 XHSSC40P08000 U Screw : 4mm x 8mm 1 AA 7- 3 XWWSD50-06000 J Washer : 4mm x 0.6mm 1 AA 7- 4 XOTSF40P12000 J Screw : 4mm x 12mm (B) 4 AA 7- 4 XOTSC40P12000 J Screw : 4mm x 12mm (W) 4 AA 7- 5 XOTSD40P10000 J Screw : 4mm x 10mm 2 AA 7- 6 XHTSD40P08RV0 J Screw : 4mm x 8mm 3 AA 7- 7 XBTUW40P06000 J Screw : 4mm x 6mm 3 AA 7- 8 XCBWW30P06000 J Screw : 3mm x 6mm 8 AA 7- 9 XNEUW40-32000 J Nut : 4mm x 3.2mm 1 AA 7-10 XOTWW40P06000 J Screw : 4mm x 6mm 2 AA 7-11 XPSSP20-20000 J Pin 1 AA 7-12 XWHUW40-08000 J Washer : 4mm x 0.8mm 1 AA 7-13 XWSUW40-10000 J Washer : 4mm x 1.0mm 1 AA 7-14 XBPSD40P25000 J Screw : 4mm x 25mm 2 AA 7-15 XNESD40-32000 J Nut : 4mm x 3.2mm 2 AA 7-16 LX-EZA045WRE0 U Special screw 10 AA 7-17 XCPSD30P06000 J Screw : 3mm x 6mm 7 AA 7-18 XFPSD40P08000 J Screw : 4mm x 8mm 8 AA 7-19 XFPSD50P10KS0 J Screw : 5mm x 10mm 2 AC 7-20 XOTSD40P12RV0 J Screw : 4mm x 12mm 6 AA 7-21 XCTWW40P06000 J Screw : 4mm x 6mm 2 AA 7-22 XBPSD40P05000 J Screw : 4mm x 5mm 27 AA 7-23 XWHSD50-08000 J Washer : 5mm x 0.8mm 1 AA 7-24 LX-EZA004WRE0 U Special screw 5 AA

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

OVEN PARTS

6-12

R-7N76(W)M R-7N76(B)M

4-43

4-44

7-5

7-8

1-28

4-3

7-24

4-21

7-7

4-14-27

4-25

4-23

4-37

7-21

4-20

7-18

7-17

4-30

1-15

1-23

6-11

1-13

7-16

4-19

1-26

7-18

7-2

7-4

2-3

4-11

7-20

4-36

7-8

1-8

7-13

1-7

7-16

7-20

1-21

4-29

7-9

7-5

7-12

7-16

7-20

7-6

4-26

4-39

1-24

7-20

4-6

7-16

7-17

7-4

4-8

1-11

1-10

7-6

7-16

1-16

1-14

7-1

4-9

7-8

4-15

1-5

7-20

7-16

1-3

4-14

7-20

7-4

4-18

4-13

4-12

7-15

1-3

7-7

2-1

7-20

1-18

4-41

1-19

4-42

7-22

4-16

7-10

4-10

4-38

4-33

4-7

7-10

1-12

1-6

7-20

4-2

1-25

7-8

4-40

7-14

7-23

2-2

7-20

7-11

4-5

4-42

7-16

1-1

7-8

7-22

1-9

7-17

7-18

4-17

4-32

2-5

2-4

7-24

2-6

7-20

NOTE: In the event of removing the turntable motor cover this part should be refitted using screw connection: LX-EZA045WRE0 (7-16)

1-27

7-20

7-19

1-22

4-22

7-3

7-20

1-2

4-31

7-20

4-4

4-28

7-16

4-35

4-24

7-20

4-34

6-4

1-29

1-20

1-17

1-4

7-6

6-3

R-7N76(W)M R-7N76(B)M

CONTROL PANEL PARTS

3-3

3-6

3-5

3-4

3-1

3-2

3-7

3-8

3-2-1

DOOR PARTS

5-6

5-2

5-1

5-10

5-9

5-7

5-3

5-8

5-7

5-10

5-7

5-4

5-9

5-5

MISCELLANEOUS

R-7N76(W)M R-7N76(B)M

6-1

6-2

Actual wire harness may be different than illustration.

PACKING AND ACCESSORIES

TRAY HOLDER *(SPADFA298WRE0)

6-6

6-7

6-8

TOP PAD ASSEMBLY *(FPADBA272WRK2)

*Not Replaceable Items

TURNTABLE TRAY

HIGH RACK LOW RACK

COOK BOOK &

INSTRUCTION BOOK (SSAKHA045WRE0)

ROLLER STAY

TRAY PAD *(SPADPA474WRE1)

OVEN BAG *(SSAKHA044WRE0)

DOOR PROTECTION SHEET *(SPADPA468WRE0)

BOTTOM PAD ASSEMBLY *(FPADBA273WRK1)

PACKING CASE

*(SPAKCC537WRR0); R-7N76(B)M *(SPAKCC538WRR0); R-7N76(W)M

N.B: ALL BROWN MICROWAVE OVENS MUST BE PACKED WITH A PAPER SHEET ON TOP OF THE OUTER WRAP

R-7N76(W)M



R-7N76(B)M

SHARP CORP 95 Printed in UK

Sharp R-7N76(B)M, R-7N76(W)M Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual