Sharp R-480J User Manual

SERVICE MANUAL

S8406R480JPJ/

MICROWAVE OVEN

R-480J

MODEL

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

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

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

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

GENERAL INFORMATION ................................................................................................................................ 2

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

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

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

SERVICING ...................................................................................................................................................... 7

TEST PROCEDURE ......................................................................................................................................... 9

TOUCH CONTROL PANEL ............................................................................................................................. 16

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 22

MICROWAVE MEASUREMENT .................................................................................................................... 28

WIRING DIAGRAM ......................................................................................................................................... 29

PICTORIAL DIAGRAM ................................................................................................................................... 30

POWER UNIT CIRCUIT .................................................................................................................................. 31

CPU UNIT CIRCUIT ........................................................................................................................................ 32

PRINTED WIRING BOARD .............................................................................................................................33

PARTS LIST ................................................................................................................................................... 34

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Page

SHARP CORPORATION

R-480J

SERVICE MANUAL

MICROWAVE OVEN

R-480J

PRODUCT SPECIFICATIONS

R-480J

GENERAL IMPORTANT INFORMATION

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

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

CAUTION

MICROWAVE RADIATION

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

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

APPEARANCE VIEW

OPERATING SEQUENCE

FUNCTION OF IMPORTANT COMPONENTS

SERVICING AND TROUBLESHOOTING CHART

TEST PROCEDURE

TOUCH CONTROL PANEL ASSEMBLY

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

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

MICROWAVE MEASUREMENT

WIRING DIAGRAM

PARTS LIST

OSAKA, JAPAN

R-480J

PRODUCT SPECIFICATIONS

ITEM DESCRIPTION

Power Requirements 230 - 240 Volts

50 Hertz Single phase, 3 wire earthed

Power Consumption 1.65 kW

Power Output 1200 watts nominal of RF microwave energy (IEC Test Procedure)

Operating frequency 2450 MHz

Case Dimensions Width 550 mm

Height 315 mm Depth 446 mm

Turntable diameter 360mm

Control Complement Touch Control System

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

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

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

MEDIUM .............................................................approx. 50% of Full Power

MEDIUM LOW .................................................... approx. 30% of Full Power

LOW .................................................................... approx. 10% of Full Power

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

Weight Approx. 19 kg

GENERAL INFORMATION

WARNING

THIS APPLIANCE MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE

1. Ventilation openings

2. Oven lamp

3. Door hinges

4. Door safety latches

5. See through door

6. Door seals and sealing surfaces

7. Coupling

8. Door open button

9. Touch control panel

10.Digital readout

11.Waveguide cover

12.Power supply cord

13.Rating label

14.Menu label

15.Turntable

16.Roller stay

APPEARANCE VIEW

TOUCH CONTROL PANEL

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EXPRESS MENUS PADS

Press to select "Express Menus" menus.

HEALTHY MENU PADS Press to select "Healty Menu" menu.

EASY DEFROST PAD Press to defrost frozen food by entering quantity.

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

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

CLOCK PAD Press to set Clock.

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

SENSOR DEFROST COOK

HELP

Display

Indicator

SENSOR COOK PADS Press to select Sensor Cook menus.

QUICK AND EASY PAD Press to select Quick and Easy menus.

SENSOR REHEAT PAD Press to select reheat menu.

HELP PAD Press to select auto start, child lock, demonstration modes or info on pads. Press to get cooking information.

NUMBER PADS

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

TIMER PAD Press to set Timer

INSTANT COOK/START PAD Press once to cook for 1 minute on HIGH or increase by 1 minute multiples each time this pad is pressed during cooking. Press to start the oven after setting programmes.

NOTE: Some one-touch cooking features such as "Instant Cook" are disabled after three minutes when the oven is not in use. These features are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.

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OPERATION SEQUENCE

OFF CONDITION

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

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

Figure O-1 on page 29

1. The display shows SHARP, MICRO-WAVE and OVEN.

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

3. “ : “ appears in the display.

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

comes on at this time.

MICROWAVE COOKING CONDITION

HIGH COOKING

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

Function sequence

Figure O-2 on page 29

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

1. Rated voltage is supplied to the primary winding of the power 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) go back to their home position (off condition)º. The circuits to the oven lamp, power transformer, fan motor and turntable motor are cut off.

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

CONDITION DURING DOOR OPEN

SWITCH CONTACT COOKING

1st. latch switch COM-NO Closed Open

2nd. interlock relay control switch COM-NO Closed Open

Monitor switch COM-NC Open Closed

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

(NO COOKING)

because the relay (RY1) stays closed. Shown in the display is the remaining time.

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

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

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

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

NC) of the monitor switch must be opened first. After that the contacts of the 1st. latch switch and 2nd. interlock relay control switch are closed.

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

1st. latch switch and 2nd. interlock relay remain closed. The fuse F10A will blow, because the monitor switch is closed and a short circuit is caused.

VARIABLE COOKING

When the microwave oven is preset for variable cooking power. Rated voltage is supplied to the power transformer intermittently within a 32-second time base through the relay contact which is coupled with the relay (RY2). The following levels of microwave power are given.

SETTING;

32 sec. ON

HIGH

24 sec. ON 8 sec. OFF

MEDIUM HIGH Approx. 70%

18 sec. ON

MEDIUM Approx. 50%

12 sec. ON

MEDIUM LOW Approx. 30%

6 sec. ON

LOW Approx. 10%

14 sec. OFF

20 sec. OFF

26 sec. OFF

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

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

SENSOR COOKING CONDITION

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

An example of how sensor works:

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

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

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

AH SENSOR

MICROWAVE

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Cooking Sequence.

1. Touch each SENSOR COOK or SENSOR INSTANT REHEAT function pad to operating the sensor cooking. Refer to the operation manual for the proper procedure.

NOTE: The oven should not be operated on SENSOR

COOK or SENSOR INSTANT REHEAT immediately after plugging in the unit. Wait two minutes before cooking on SENSOR COOK or SENSOR INSTANT REHEAT.

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

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

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

touch STOP/CLEAR pad.

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

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

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

POWER OUTPUT REDUCTION

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

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FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM

The door can be opened by pushing the door open button on the control panel. When the door open button is pushed, the latch lever is moved upward, operating the latch head. The latch head is moved upward, and released from latch hook. Now the door can be opened.

Door

Latch Hook

Latch Heads

Switch Lever

2nd. Interlock Relay Control Switch

Monitor Switch

1st. Latch Switch

Figure D-1. Door Open Mechanism

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

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

2. When the oven door is opened, the contacts (COMNO) must be opened.

MONITOR SWITCH

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

2. When the oven door is opened, the contacts (COMNC) must be closed.

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

CAUTION: BEFORE REPLACING A BLOWN FUSE

(F10A) TEST THE 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE".)

THERMAL CUT-OUT 145˚C (OVEN)

The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of control unit. Under normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperature is reached within the oven cavity, the oven thermal cut-out will open at 145˚C, causing the oven to shut down. The defective thermal cut-out must be replaced with new one.

THERMAL CUT-OUT 145˚C (MAGNETRON)

The thermal cut-out located near the magnetron is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the magnetron, the thermal cut-out will open at 145˚C causing the oven to shut down. The defective thermal cut-out must be replaced with new one.

TURNTABLE MOTOR

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

FAN MOTOR

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

NOISE FILTER

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

FUSE (F10A)

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 and 2nd. interlock relay remains closed with the oven door open and when the monitor switch closes.

HIGH VOLTAGE FUSE 0.75A

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

SERVICING

WARNING TO SERVICE PERSONNEL

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Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage fuse, 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 power transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer.

REMEMBER TO CHECK 4R

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. Check all functions.

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

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

TROUBLESHOOTING GUIDE

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

IMPORTANT: If the oven becomes inoperative because

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

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CK = Check / RE = Replace

CONDITION

OFF CONDITION

ON CONDITION

SENSOR COOKING CONDITION

TEST PROCEDURE

ABCDEEEFG GHHIJKLMN

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

PROBLEM

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

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

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

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

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

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

Oven lamp does not light (Display appears.)

Fan motor does not operate. (Display appears.)

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

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

Oven seems to be operating but little or no heat is produced in oven load. (Microwave power level is set at HIGH)

Oven does not seems to be operating properly when MEDIUM HIGH, MEDIUM, MEDIUM LOW or LOW is set. (Oven operates properly at HIGH and when the STOP/CLEAR pad is touched the oven stops.)

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

Oven stops as soon as when the START pad is touched.

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

Oven stops at 16 sec. after starting.

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

1ST. LATCH SWITCH

2ND. N D. INTERLOCK RELAY

CONTROL SWITCH

MONITOR SWITCH

NOISE FILTER

RE RE CK CK CK CK CK CK CK CK O

THERMAL CUT-OUT (MAGNETRON)

THERMAL CUT-OUT (OVEN)

FAN MOTOR

TURNTABLE MOTOR

FUSE F10A

HIGH VOLTAGE FUSE

TOUCH CONTROL PANEL

KEY UNIT

RELAY (RY-1, RY-2)

FOIL PATERN ON P.W.B.

POWER SUPPLY CORD

OVEN LAMP OR SOCKET

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

WALL OUTLET

HOME FUSE OR BREAKER

WRONG OPERATION

BLOCKED VENTILATION OPENING

MISADJUSTMENT SWITCH

AH SENSOR

BLOCKED COOLING FAN

TEST PROCEDURES

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PROCEDURE

LETTER

A MAGNETRON 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 circuit filament to anode condition, connect ohmmeter between one of the filament terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.

MICROWAVE OUTPUT POWER (1 litre water load)

The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted). Microwave output power from the magnetron can be measured by IEC test procedure, i.e. it can be measured by using water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W) heating works for t(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.

COMPONENT TEST

The formula is as follows;

P x t / 4.187 = V x ∆ T+ 0.55 x mc (T2-T0)/

4.187P (W) = 4.187 x V x ∆T / t + 0.55 x mc (T2-T0)/t

Our condition for water load is as follows:

Room temperature (T0) ... around 20°CPower supply Voltage .............. Rated voltage

Water load..................................1000 g Initial temperature (T1) ...................... 10±1°C

Heating time .............................. 35 sec. Mass of container (mc) ......................... 330 g

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

Measuring condition:

1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

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

3. Temperature of the water The initial temperature of the water is (10±1)˚C.

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

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

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

7. The water load must be (1000±5) g.

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

NOTE: The operation time of the microwave oven is “t + 3” sec. 3 sec. is magnetron filament heat-

up time.

Measuring method:

1. 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 ˚C.

5. Stir the water to equalize temperature throughout the vessel.

6. Measure the final water temperature. (Example: The final temperature T2 = 21°C)

7. Calculate the microwave power output P in watts from above formula.

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TEST PROCEDURES

PROCEDURE

LETTER

Room temperature .................. To = 21˚C Initial temperature ................. T1 = 11°C

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

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

Measured output power

The equation is “P = 120 x ∆T” ........................................... P = 120 x 10°C = 1200 Watts

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

CAUTION: 1°C CORRESPONDS TO 120 WATTS REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

1000g

T1˚C

B POWER TRANSFORMER TEST

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

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

COMPONENT TEST

1000g

Heat up for 38 sec.

1000g

T2˚C

CARRY OUT 3D CHECKS.

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

a. Primary winding .................. approx. 1.0 Ω

b. Secondary winding .............. approx. 84 Ω

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

If the reading obtained are not stated as above, then the power 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.

HIGH VOLTAGE RECTIFIER

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.

D HIGH VOLTAGE CAPACITOR TEST

CARRY OUT

A. Isolate the high voltage capacitor from the circuit.

3D CHECKS.

TEST PROCEDURES

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PROCEDURE

LETTER

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

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

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

E SWITCH TEST

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

COMPONENT TEST

range.

it has been charged.

4R CHECKS.

3D CHECKS.

Table: Terminal Connection of Switch

Plunger Operation COM to NO COM to NC COM; Common terminal

Released Open circuit Short circuit NO; Normally open terminal

Depressed Short circuit Open circuit NC; Normally close terminal

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

CARRY OUT

4R CHECKS.

F NOISE FILTER TEST

CARRY OUT 3D CHECKS.

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

MEASURING POINT INDICATION OF OHMMETER

Between N and L Open circuit

Between terminal N and WHITE Short circuit

Between terminal L and RED Short circuit

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

CARRY OUT 4R CHECKS.

G THERMAL CUT-OUT 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 table below.

FUSE

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR

0.068µ/AC250V

0.0022µ/AC 250V

WHT RED

0.0022µ/AC 250V

F10A

CARRY OUT 4R CHECKS.

Table: Thermal cut-out Test

Parts Name condition (closed circuit) (˚C) condition (open circuit) (˚C) (When room temperature

Thermal cut-out 145˚C This is not resetable type. Above 145˚C Closed circuit.

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

is approx. 20˚C)

If incorrect readings are obtained, replace the thermal cut-out.

An open circuit thermal cut-out 145˚C (MAGNETRON) indicates that the magnetron has overheated, this may be due to restricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out 145˚C (OVEN) indicates that the foods in the oven may catch fire, this may be due to over heating produced by improper setting of the cooking time or failure of the control panel.

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TEST PROCEDURES

PROCEDURE

LETTER

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.

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R CHECKS.

I BLOWN FUSE F10A

CARRY OUT 3D CHECKS.

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

2. If the fuse F10A is blown when the door is opened, check the 1st. latch switch, 2nd. interlock relay and monitor switch. If the fuse F10A is blown by incorrect door switching replace the defective switch(s) and the fuse F10A.

COMPONENT TEST

Table: Resistance of Motor

Motors Resistance Fan motor Approximately 250 Ω Turntable motor Approximately 14.5 kΩ

CARRY OUT 4R CHECKS.

CAUTION: ONLY REPLACE FUSE F10A WITH THE CORRECT VALUE REPLACEMENT

J HIGH VOLTAGE FUSE TEST

CARRY OUT 3D CHECKS. If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.

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

CARRY OUT 4R CHECKS.

CAUTION: ONLY REPLACE THE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE RE-

PLACEMENT

K TOUCH CONTROL PANEL ASSEMBLY TEST

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

1. Key Unit. Note: Check key unit ribbon connection before replacement. The following symptoms indicate a defective key unit. Replace the 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. Before replacing the control unit, perform the Key unit test (Procedure L) to determine if control unit is faulty.

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.

TEST PROCEDURES

R-480J

PROCEDURE

LETTER

2-3 Other possible troubles caused by defective control unit.

L KEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the door 2nd. interlock relay control switch operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the 2nd. interlock relay control switch is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the 2nd. interlock relay control switch is closed (either close the door or short the 2nd. interlock relay control switch connector). Use the key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault. CARRY OUT 3D CHECKS.

COMPONENT TEST

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.

a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible.

G1 G2 G3 G4 G5 G6 G7 G8

LOW FAT

MEALS

DESSERTS

VEGETABLES

EASY

DEFROST

EXPRESS

MEAL

SENSOR REHEAT

EXPRESS

COOK

VEGETARIAN

MEALS

INSTANT

COOK START

LESS

TIMER

POWER

LEVEL

RICE/

PASTA

CLOCK

HELP

QUICK &

EASY

EXPRESS DEFROST

STOP

CLEAR

G10

G11

G12

G13

M RELAY TEST

Remove the outer case and check voltage between Pin No 1 of the 2-pin connector (A) and the normal open terminal of the relay RY1 on the power unit with an A.C. voltmeter. The meter should indicate 230 - 240 volts, if not check oven circuit.

RY1 and RY2 Relay Test These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

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

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

control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 APPROX. 25.0V D.C. Oven lamp / Turntable motor / Cooling fan motor

RY2 APPROX. 24.0V D.C. Power transformer

CARRY OUT 4R CHECKS.

N PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD

(PWB) IS OPEN

G14

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.

R-480J

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

Problem: POWER ON, indicator does not light up. CARRY OUT 3D CHECKS.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 The rated AC voltage is not present between Check supply voltage and oven power cord.

Pin No. 1 of the 2-pin connector (A) and the normal open terminal of the relay RY1.

2 The rated AC voltage is present to primary Low voltage transformer or secondary circuit defective.

side of low voltage transformer. Check and repair.

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

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

QKITPB026MRE0

NOTE: *At the time of making these repairs,

make a visual inspection of the varistor.

VRS1

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

CN - A

(J1)

OMIF

CARRY OUT 4R CHECKS.

O AH SENSOR TEST

Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure.

(1) The oven should be plugged in at least two minutes before sensor cooking. (2) Room temperature should not exceed 35˚C. (3) The unit should not be installed in any area where heat and steam are generated. The unit should

not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION INSTRUCTIONS” of the operation manual.

(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To

permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.

(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any

moisture with a dry cloth or paper towel.

(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would

be at refrigerator temperature and canned soup at room temperature.

(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The

sensor will detect the vapor given of by the spray and turn off before food is properly cooked.

(8)

If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.

Water load cooking test WARNING : The oven should be fully assembled before following procedure.

Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The cabinet should be installed and screws tightened. (1) Fill approximately 200 milliliters (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 the CLOCK once, the POWER LEVEL pad twice, the START pad once, the number pad

1 once and the number pad 4 once. Now, the oven is in the sensor cooking condition, and "AH20", "SENSOR" and "COOK" will appear in the display.

(5) The oven will operate for the first 16 seconds, without generating microwave energy. NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage

of sensor cooking. (6) After approximately 16 seconds, microwave energy is produced. If ERROR is displayed or the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below. If the oven stops after 5 minutes and ERROR is displayed, the AH sensor is normal. Check other parts except the AH sensor.

TEST PROCEDURES

Plunger

NC NO

COM

R3 R4

1 2 3

F-1 F-2

F-3

To connector (F) on Control Unit.

CONNECTOR

R-480J

PROCEDURE

LETTER

COMPONENT TEST

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (1) Disconnect the power supply cord, and then remove outer case. (2) Open the door and block it open. (3) Discharge high voltage capacitor. (4) Remove the AH sensor. (5) Install the new AH sensor. (6) Reconnect all leads removed from components during testing. (7) Re-install the outer case (cabinet). (8) Reconnect the power supply cord after the outer case is installed. (9) Reconnect the oven to the power supply and check the sensor cook operation as follows:

9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the door. 9-4. Touch the CLOCK pad once, the POWER LEVEL pad twice, the START pad once, the

number pad 1 once and the number pad 4 once. 9-5. The control panel is in automatic Sensor operation. 9-6. The oven turns off automatically, and the time for detecting moisture will be displayed.

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

CHECKING CONTROL UNIT

(1) Disconnect the power supply cord, and then remove outer case. (2) Open the door and block it open. (3) Discharge high voltage capacitor. (4) Disconnect the sensor connector that is mounted to control panel. (5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel. (6) Disconnect the leads to the primary of the power transformer. (7)

Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. (8) After that procedure, re-connect the power supply cord. (9) Check the sensor cook operation proceed as follows:

9-1. Touch the CLOCK pad once, the POWER LEVEL pad twice, the START pad once and the

number pad 1 once and the number pad 4 once. 9-2. The control panel is in the sensor cooking operation. 9-3. After approximately 25 seconds, push plunger of select switch for more than 3 seconds.

This condition is same as judgement by AH sensor.

9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the time for detecting

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

(10) Disconnect the power supply cord, and then remove outer case. (11) Open the door and block it open. (12) Discharge high voltage capacitor. (13) Disconnect the dummy resistor circuit from the sensor connector of control panel. (14) Carry out necessary repair. (15) Reconnect all leads removed from components during testing and repairing. (16) Re-install the outer case (cabinet). (17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all

functions.

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

R1,R2 : 22Ω ± 1% 1/2W R3 : 4.3kΩ ± 5% 1/4W R4 : 1MΩ ± 5% 1/4W

Sensor Dummy Resistor Circuit

R-480J

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units.

(1) Key Unit (2) Control Unit (The Control Unit consists of Power

Unit and LSI Unit).

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

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P00-P07. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P14-P17, AIN6 and AIN7 to perform the function that was requested.

Control Unit

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

1) Reset Circuit

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

2) Indicator Circuit

This circuit consists of 40 segments and 16 common electrodes using a Liquid Crystal Display.

3) Power Source Circuit

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

In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit.

Symbol Voltage Application

VC -5V LSI(IC1)

4) Relay Circuit

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

5) Buzzer Circuit

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

6) Synchronizing Signal Circuit

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

7) 2nd. Interlock Relay Control Switch

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

8) Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD10-LD15).

9) Absolute Humidity Sensor Circuit

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

LSI

100 PERCENT

70 PERCENT

H : GND

L : -5V

H : GND

L : -5V

OFF

OFF OFF

24 sec.

8 sec.

The I/O signal of the LSI is detailed in the following table.

Pin No. Signal I/O Description

1 COM5 OUT Common data signal : COM11. Connected to LCD signal COM11.

2 COM4 OUT

Common data signal : COM12. Connected to LCD signal COM12.

3 COM3 OUT Common data signal : COM13. Connected to LCD signal COM13.

4 COM2 OUT Common data signal : COM14. Connected to LCD signal COM14.

5 COM1 OUT Common data signal : COM15. Connected to LCD signal COM15.

6 COM0 OUT Common data signal : COM16. Connected to LCD signal COM16.

7-10 VL1-VL4 IN

Power source voltage input terminal.

Standard voltage for LCD.

11 VL5 IN

Power source voltage input terminal.

Standard voltage for LCD. Connected to GND.

12-14 C3-C1 IN Terminal not used.

15 VLIN IN Terminal not used.

16 VREG OUT Terminal not used.

17 NC

18 VSS IN

Terminal not used.

Power source voltage : -5.0V.

The power source voltage to the LSI is input to VSS terminal. Connected to VC.

19-21 P27-P25 OUT Terminal not used.

22-26 P24-P22 IN Used for initial balancing of the bridge circuit (absolute humidity sensor).

27 P47 IN

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

Door close "H" level signal (0V). Door open "L" level signal (-5V).

28 P46 OUT Terminal not used.

29 P45 OUT

Oven lamp, fan motor and turntable motor driving signal.

To turn on and off shut off relay (RY1). The

20.0 msec.

square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.

During cooking

R-480J

H : GND

L : -5V

30 P44 OUT Magnetron high-voltage circuit driving signal.

31 P43

32 CNTR0 OUT

33 P41 OUT Terminal not used.

34 INT0 IN

35 P07 OUT Key strobe signal.

36 P06 OUT

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

(ON and OFF times for other power level.)

Terminal not used.

Signal to sound buzzer (2.0 kHz).

A: key touch sound. B: Completion sound.

0.1 sec.

2.0 sec.

Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

20.0 msec.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G1 line keys on key matrix is touched.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G2 line keys on key matrix is touched.

H : GND

L : -5V

H : GND

L : -5V

H : GND

L : -5V

R-480J

Pin No. Signal I/O Description

37 P05 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G3 line keys on key matrix is touched.

38 P04 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16, P17 and AIN6 terminal while one of G4 line keys on key matrix is touched.

39 P03 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G5 line keys on key matrix is touched.

40 P02 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G6 line keys on key matrix is touched.

41 P01 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G7 line keys on key matrix is touched.

42 P00 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G8 line keys on key matrix is touched.

43 P17 IN

Signal coming from touch key.

When either G9 line on key matrix is touched, a corresponding signal out of P00-P07 will be input into P17. When no key is touched, the signal is held at "H" level.

44 P16 IN

Signal similar to P17.

When either G10 line on key matrix is touched, a corresponding signal will be input into P16.

45 P15 IN

Signal similar to P17.

When either G11 line on key matrix is touched, a corresponding signal will be input into P15.

46 P14 IN

Signal similar to P17.

When either G12 line on key matrix is touched, a corresponding signal will be input into P14.

47 AIN7 IN

Signal similar to P17.

When either G13 line on key matrix is touched, a corresponding signal will be input into AIN7.

48 AIN6 IN

Input terminal to judge the model.

The signal out of P04 will be input into AIN6 through G4 line on key matrix. The LSI will judge the model by this signal.

49 AIN5 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.

50 AIN4 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 converter built into the LSI.

51 RESET IN

Auto clear terminal.

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

52 NC

Terminal not used.

53 XCOUT OUT Terminal not used.

54 XCIN IN Connected to VC.

55 NC

56 VCC IN

Terminal not used.

Power source voltage: GND(0V).

The power source voltage to drive LSI is input to VCC terminal.

57 OSCSEL IN Connected to VC(-5V).

58 XOUT OUT

Internal clock oscillation output.

Output to control oscillation input of XIN.

59 VSS IN

Power source voltage: -5.0V.

The power source voltage to the LSI is input to VSS terminal. Connected to VC.

60 NC

61 XIN IN

Terminal not used.

Internal clock oscillation frequency control input setting.

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

62 NC

Terminal not used.

Pin No. Signal I/O Description

63-66 AIN3-AIN0 IN

Terminal to change cooking input according to the Model.

By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.

67 COM8 OUT Common data signal : COM8. Connected to LCD signal COM8.

.68 COM9 OUT Common data signal : COM7. Connected to LCD signal COM7.

69 COM10 OUT Common data signal : COM6. Connected to LCD signal COM6.

70 COM11 OUT Common data signal : COM5. Connected to LCD signal COM5.

71 COM12 OUT Common data signal : COM4. Connected to LCD signal COM4.

72 COM13 OUT Common data signal : COM3. Connected to LCD signal COM3.

73 COM14 OUT Common data signal : COM2. Connected to LCD signal COM2.

74 COM15 OUT Common data signal : COM1. Connected to LCD signal COM1.

75-102

103-142

SEG67-SEG40

SEG39-SEG0 OUT Segment data signal.

OUT Terminal not used.

Connected to LCD. The relation between signals and LCD are as follows:

LSI signal (Pin No.) LCD segment LSI signal (Pin No.) LCD segment

SEG 39 (103) ................................. SEG 1 SEG 19 (123) ............................... SEG 21

SEG 38 (104) ................................. SEG 2 SEG 18 (124) ............................... SEG 22

SEG 37 (105) ................................. SEG 3 SEG 17 (125) ............................... SEG 23

SEG 36 (106) ................................. SEG 4 SEG 16 (126) ............................... SEG 24

SEG 35 (107) ................................. SEG 5 SEG 15 (127) ............................... SEG 25

SEG 34 (108) ................................. SEG 6 SEG 14 (128) ............................... SEG 26

SEG 33 (109) ................................. SEG 7 SEG 13 (129) ............................... SEG 27

SEG 32 (110) ................................. SEG 8 SEG 12 (130) ............................... SEG 28

SEG 31 (111) ................................. SEG 9 SEG 11 (131) ............................... SEG 29

SEG 30 (112) ................................. SEG 10 SEG 10 (132) ............................... SEG 30

SEG 29 (113) ................................. SEG 11 SEG 9 (133) ............................... SEG 31

SEG 28 (114) ................................. SEG 12 SEG 8 (134) ............................... SEG 32

SEG 27 (115) ................................. SEG 13 SEG 7 (135) ............................... SEG 33

SEG 26 (116) ................................. SEG 14 SEG 6 (136) ............................... SEG 34

SEG 25 (117) ................................. SEG 15 SEG 5 (137) ............................... SEG 35

SEG 24 (118) ................................. SEG 16 SEG 4 (138) ............................... SEG 36

SEG 23 (119) ................................. SEG 17 SEG 3 (139) ............................... SEG 37

SEG 22 (120) ................................. SEG 18 SEG 2 (140) ............................... SEG 38

SEG 21 (121) ................................. SEG 19 SEG 1 (141) ............................... SEG 39

SEG 20 (122) ................................. SEG 20 SEG 0 (142) ............................... SEG 40

143 COM7 OUT Common data signal : COM9. Connected to LCD signal COM9.

144 COM6 OUT

Common data signal : COM10. Connected to LCD signal COM10.

R-480J

ABSOLUTE HUMIDITY SENSOR CIRCUIT

(1) Structure of Absolute Humidity Sensor

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

ventilation opening for sensing

Sensing part (Open vessel)

Thermistors

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 it heated at about 150˚C (302˚F), the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit, the intensity of which is increased as the absolute humidity of the air increases. Since the output is very minute, it is amplified by the operational amplifier.

Absolute humidity vs,

Operational amplifier

Output voltage

output voltage characteristic

Then the LSI observes that voltage at AIN5 terminal and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit goes in the next operation automatically. When the LSI starts to detect the initial voltage at AIN5 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is not possible to balance the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will appear on the display and the cooking is stopped.

1) Absolute humidity sensor circuit

SW1

P20

SW2

P21

SW3

P22

SW4

P23

SW5

P24

AIN4

LSI (IC1)

AIN5

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

F-1 C

F-3

3.57k

F-2

VA : -15V

R96

R91

3.32k

R90

330

C90

R92

1.8k

R98

R99

R100

R101

R102

0.1

R97

15k

620k

300k

150k

75k

37.4k

C93

8765

1234

IC2

D90

VA : -15V

R93

360k

0.01uF

C91

0.1uF

R94

4.7k

VC : -5V

R95

15k

0.01uF

C92

S : Thermistor open vessel

C : Thermistor closed vessel

Output voltage

Absolute humidity (g/m )

(3) Detector Circuit of Absolute Humidity Sensor Circuit

This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its AIN5 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R98 ~ R102. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AIN4 terminal of the LSI. The voltage of AIN5 terminal will indicate about -2.5V. This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AIN5 terminal of the LSI.

TOUCH CONTROL PANEL SERVICING

R-480J

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 2SB1238

Transistor KRC243M

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

B. On some models, the power supply cord between the

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

(2) Servicing the touch control panel with power supply

from an external power source:

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

3. Servicing of Touch Control Panel

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

(1) Servicing the touch control panel with power sup-

ply of the oven: CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING PRESENTS A HAZARD.

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

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

touch control panel and the oven itself is so short that the two can’t be separated.

4. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 30W (It is recommended to use a soldering iron with a grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC10MHz 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 key unit to the control unit being sure that the lead wires are not twisted.

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

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

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

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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING:

1. Disconnect the oven from the power supply.

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, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:

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

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.

WARNING FOR WIRING

To prevent an electric shock, take the following manners.

1. Before wiring,

1) Disconnect the power supply.

2) Open the door and wedge the door open.

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

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

1) High voltage parts: Magnetron, High voltage transformer, High voltage capacitor, High voltage rectifier assembly and High voltage fuse.

2) Hot parts: Oven lamp, Magnetron, High voltage transformer

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 four (4) screws from rear and along the side edge of case.

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

5. Lift the entire case from the oven.

and Oven cavity.

3) Sharp edge: Bottom plate, Oven cavity, Waveguide flange, Chassis support and other metallic plate.

4) Movable parts (to prevent a fault) Fan blade, Fan motor, Switch, Switch lever, Open button.

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

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

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

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 from the basis of the 3D checks. CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR

BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

POWER TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from power transformer, magnetron and capacitor terminals.

3. Remove four (4) screws holding transformer to bottom plate.

4. Remove transformer from bottom plate.

Re-install

1. Rest transformer on the bottom plate with its primary

terminals toward front side.

2. Secure the transformer with four (4) screws to bottom plate.

3. Re-connect wire leads (primary and high voltage) to power transformer and filament leads of transformer to magnetron and high voltage capacitor. Refer to "PICTORIAL DIAGRAM".

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

MAGNETRON REMOVAL

Removal

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from magnetron.

3. Remove the two (2) screws holding the magnetron air duct to magnetron. And slide magnetron air duct slightly so that two (2) screws at left hand side of magnetron appear.

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

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

6. Now, the magnetron is free.

Re-install

1. Re-install the magnetron to waveguide flange with care

so that magnetron antenna is not hit by any metal object.

2. Secure the magnetron with four (4) screws.

3. Hold the magnetron air duct to the magnetron and secure the magnetron air duct with two (2) screws.

4. Re-connect the wire leads to the magnetron. Refer to "PICTORIAL DIAGRAM".

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

CAUTION: WHEN REPLACING MAGNETRON, BE

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

HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL

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1. CARRY OUT

3D CHECKS.

2. Disconnect the wire lead from the fan motor.

3. Remove the fan duct from the oven cavity.

4. Remove two (2) screws holding the fan motor to the oven cavity back plate and remove it.

5. Disconnect the wire lead of high voltage rectifier assembly from the magnetron.

6. Disconnect high voltage fuse from the capacitor.

7. Disconnect filament lead of the power transformer from the capacitor.

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

TURNTABLE MOTOR REMOVAL

1. Disconnect oven from power supply.

2. Remove turntable and turntable support from oven cavity.

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

4. Where the portions have been snipped off bend portions flat. No sharp edge must be evident after removal of the turntable motor cover.

5. Disconnect wire leads from turntable motor. (See "Positive lock connector removal")

6. Remove two (2) screws holding turntable motor to oven cavity.

7. Remove an o-ring and a washer from the turntable motor shaft.

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

10.Remove the capacitor holder

11.Disconnect the high voltage rectifier assembly from capacitor.

12.Now, capacitor and rectifier assembly are free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC-

TIFIER AND HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

8. Now the turntable motor is free.

HOW TO RE-INSTALL THE TURNTABLE MOTOR COVER

1. Remove the one (1) screw which is fixed on the bottom plate left near by the turntable motor cover. This screw will be used at the following step 3.

2. Insert the two (2) tabs of the turntable motor cover into the two (2) slits of the bottom plate left.

3. Hold the turntable motor cover to the bottom plate left with the one (1) screw which is prepared at the above step 1.

4. Now the turntable motor cover is re-installed.

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

Push the lever of positive lock® connector. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU (SERVICE PERSON).

Terminal

Positive lock® connector

Lever

Push

Pull down

Figure C-1 Positive lock®connector

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OVEN LAMP AND LAMP SOCKET REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove one (1) screw holding the chassis support to the magnetron and magnetron air duct.

3. Remove one (1) screw holding the chassis support to the oven cavity front plate.

4. Remove the chassis support from the oven cavity.

5. Release the magnetron air duct from the oven cavity.

6. Remove the oven lamp socket from the magnetron air duct by bending the small tab of magnetron air duct.

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

8. Remove the oven lamp from the oven lamp socket by turning the oven lamp.

CONTROL PANEL ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from panel components.

3. Release one (1) nail holding the control panel assembly to the oven flange.

4. Remove control panel assembly and slide upward.

5. Now, the control panel assembly is free.

NOTE: 1. Before attaching a new key unit, remove

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

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

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

9. Now, the oven lamp and lamp socket are free.

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flat type small screw driver

Figure C-2. Oven lamp socket

CPU UNIT AND POWER UNIT NOTE: Handle the CPU unit carefully so that the ribbon

cable does not come off. Because the ribbon cable is sticked on the LCD and the printed wiring board only by heated paste.

Ribbon cable

Liquid Crystal

Display (LCD)

of CPU unit

Printed wiring board

Figure C-3 CPU unit

COOLING FAN MOTOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the fan motor.

3. Remove the fan duct from the oven cavity.

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

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

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

a pair of grove joint pliers.

CAUTION:

* Make sure that any pieces do not enter the gap

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

* Do not touch the pliers to the coil of the fan

motor because the coil may be cut or injured.

*Do not disfigure the bracket by touching with

the pliers.

2) Remove the fan blade 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.

6. Now, the fan motor is free.

INSTALLATION

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

1) Hold the center of the bracket which supports the

shaft of the fan motor on the flat table.

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

the fan blade.

3) Install the fan blade 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 disfigured.

* Make sure that the fan blade rotates smooth

after installation.

* Make sure that the axis of the shaft is not

slanted.

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

3. Re-install the fan duct to the oven cavity.

Coil

Groove joint pliers

Stator

Gap Bracket

Rotor

Rear View

Shaft

Axis

Stator

Rotor

Side View

POWER SUPPLY CORD REPLACEMENT

Removal

1. CARRY OUT 3D CHECKS.

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

3. Remove the single (1) screw holding the earth wire of power supply cord to the chassis support.

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

Re-install

1. Insert the power supply cord into the oven cavity back plate.

2. Connect the brown and blue wires of power supply cord into the terminals of noise filter, referring to pictorial diagram.

3. Re-install the earth wire to chassis support with one (1) screw.

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

Shaft

These are the positions that should be pinched with pliers.

Table

Center of bracket

4. CARRY OUT 4R CHECKS.

Note : Step 4 above is important, and it must be done

after replacing power supply cord.

Power supply cord

Blue wire

WHT

M10A

RED

Noise filter

Brown wire

Green/Yellow wire

Figure C-4. Power supply cord replacement

1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH

REMOVAL

Removal

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from the switches.

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

4. Remove latch hook assembly from oven flange.

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

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

Re-install

1. Re-install each switch and switch lever in its place. The 1st. latch switch is in the lower position and 2nd. interlock relay control switch is in the upper position. The monitor switch is in the middle position.

2. Re-connect wire leads to each switch. Refer to pictorial diagram.

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

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

1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR

SWITCH ADJUSTMENT

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

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

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

activated with the door closed. The holizontal position of the latch hook should be adjusted so that the monitor switch is activated with the door closed.

3. Secure the screws with washers firmly.

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

After adjustment, check the following.

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

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

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

3. Monitor switch contacts close when door is opened.

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

DOOR REPLACEMENT

REMOVAL

1. Disconnect oven from power supply.

2. Push the open button and open the door slightly.

3. Insert a putty knife (thickness of about 0.5mm) into the gap between the door stopper and the choke cover to free engaging parts as shown in Figure C-6.

4. Try the principles of the lever and lift up the door stopper.

5. Now, the door stopper is free from the door assembly.

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

7. Now, door assembly is free from oven cavity.

8. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-6 to free engaging parts.

9. Pry the choke cover by inserting a putty knife as shown Figure C-6.

10.Release choke cover from door panel.

11.Now choke cover is free.

NOTE: When carrying out any repair to the door, do

not bend or warp the slit choke (tabs on the door panel assembly) to prevent microwave leakage.

Door stopper

Door Frame

Putty Knife

Door

Latch Hook

Latch Heads

Switch Lever

2nd. Interlock Relay Control Switch

Monitor Switch

1st. Latch Switch

Figure C-5. Latch Switch Adjustments

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

17.Tear sealer film from door panel.

18.Now, door panel is free.

19.Remove door screen from door frame as follows.

1) Turn the door frame over. Refer to Figure 1.

2) Push the lower right corner of the door screen by your finger from the front side of the door frame. And slide the door screen over the lower right corner tab until the lower and right edges of the door screen touch the tabs of the door frame. Refer to Figure 2.

Lower Left Corner Tab

Door frame

Tabs

Door screen

Lower Right Corner Tab

View; back side of door frame

3) Turn the door frame back. Refer to Figure 3.

4) Push the upper right corner of the door screen by your finger from the back side of the door frame. And slide the door screen counter clockwise. Refer to Figure 3.

5) Pull out the door screen toward the upper right corner of the door frame. Refer to Figure 4.

Choke Cover

Figure C-6. Door Disassembly

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

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

14.Remove the three (3) screws holding the door panel to the door frame.

15.Release door panel from nine (9) tabs of door frame by sliding door panel downward.

View; front side of door frame

20.Now, door screen is free.

RE-INSTALL

1. Re-install door screen to the door frame by reversing the procedure of item 19 of "REMOVAL".

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

3. Re-install door panel to door frame by fitting nine (9) tabs of door frame to nine (9) holes of door panel.

4. Hold the door panel to the door frame by sliding the

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door panel upward.

5. Hold the door panel to the door frame with three (3) screws.

6. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head to door frame.

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

8. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges as shown Figure C-7.

9. Re-install the door stopper to the door assembly.

Note: After any service to the door; (A) Make sure that 2nd. interlock relay control switch,

1st. latch switch and monitor switch are operating properly. (Refer to chapter “Test Procedures”.).

(B) An approved microwave survey meter should be

used to assure compliance with proper microwave radiation emission limitation standards.

After any service, make sure of the following :

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

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

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

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

Note: The door on a microwave oven is designed to act

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

Upper oven hinge

Door assembly

Choke cover

Door stopper

Lower oven hinge

Figure C-7. Door Replacement

SEALER FILM

Installation

1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-8.

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

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

Sealer film

Backing film

Adhesive tape

Figure C-8. Sealer film

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MICROWAVE MEASUREMENT

After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven.

REQUIREMENT

The safety switch must prevent microwave radiation emission in excess of 5mW/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.

mW cm

Microwave leakage measurement at 5 cm distance

SCHEMATIC

NOTE: CONDITION OF OVEN

1.DOOR CLOSED.

2.CLOCK APPEARS ON DISPLAY.

FUSE F10A

BRN

230-240V/50Hz

G-Y

EARTH

BLU

NOISE SUPPRESSION COIL

0.068µ/AC250V

LINE CROSS CAPACITOR

NOTE: " " indicates components with potentials above 250V.

THERMAL CUT-OUT 145˚C (MAGNETRON)

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

THERMAL CUT-OUT 145˚C (OVEN)

N.O.

COM. COM.

RY-1

CONTROL UNIT

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. LATCH SWITCH

RY-2 2ND. INTERLOCK RELAY

N.O.

AH SENSOR

OVEN LAMP

TTM

FAN MOTOR

TURNTABLE MOTOR

MONITOR SWITCH

POWER TRANSFORMER

H. V. FUSE

0.8A

CAPACITOR

1.13µ AC2300V

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MAGNETRON

H.V. RECTIFIER

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START KEY TOUCHED.

FUSE F10A

BRN

230-240V/50Hz

G-Y

EARTH

BLU

NOISE SUPPRESSION COIL

0.068µ/AC250V

LINE CROSS CAPACITOR

Figure O-1. Oven Schematic-OFF Condition

THERMAL CUT-OUT 145˚C (MAGNETRON)

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

THERMAL CUT-OUT 145˚C (OVEN)

N.O.

RY-1

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. LATCH SWITCH

COM.

RY-2 2ND. INTERLOCK RELAY

CONTROL UNIT

N.O.

AH SENSOR

OVEN LAMP

TTM

FAN MOTOR

TURNTABLE MOTOR

POWER TRANSFORMER

MONITOR SWITCH

H. V. FUSE

0.8A

CAPACITOR

1.13µ AC2300V

MAGNETRON

H.V. RECTIFIER

Figure O-2. Oven Schematic-Cooking Condition

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POWER

SUPPLY

CORD

BLU

BRN

LIVE

NEUTRAL

M10A

NOISE FILTER

WHT

RED

2345 6

EARTH

HIGH VOLTAGE

ORG

THERMAL

CUT-OUT

(MAGNETRON)

CAPACITOR

H.V. FUSE

H.V.RECTIFIER

POWER

TRANSFORMER

RED

HIGH VOLTAGE COMPONENTS

ORG

RED

MAGNETRON

BLU

GRY

BLK

RED

WHT

THERMAL

WHT

CUT-OUT (OVEN)

ORGWHT

OVEN LAMP

AND SOCKET

NOTE:

Neutral (WHT) wire

must be connected

BLACK

MARK

to the terminal with

black mark on the

oven light socket.

GRY

TURNTABLE

MOTOR

BLK

Figure S-1. Pictorial Diagram

RED

GRN

GRY

WHT

BLU

WHT

COM.

RY1

N.O.

WHT

N.C.

ORG

COM.

RED

MONITOR

SWITCH

N.O.

1ST.

COM.

LATCH

SWITCH

N.O.

2ND.

AH SENSOR

BLK

RED

WHT

CN-F

123

COM.

INTERLOCK

RELAY

CONTROL

SWITCH

CONTROL PANEL

GRN

CN-F

CN-C

(CPU UNIT)

CN-G

RED

GRN

CN-B

(POWER UNIT)

RY2

GRY 1

COM.

CN-A

N.O.

BLK

CN-A

112

BLK

RED

ORG

123456

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CN-A

OVEN LAMP

TURNTABLE MOTOR FAN MOTOR

MICRO

2345 6

CN-C 12PIN LEAD

C10

C 2

C 3

C 1

C 4

C 9

WIRE HARNESS

LED

GND

INT

A 1

A 2

VRS1

(J1)

10G471K

RY1

–

1SS270A1SS270A

C2 1000µ/35v

Q2 2SB1238

R1 2.4k

Q1 2SB1238

R2 680 1/2w

ZD1

HZ16-1

R5 4.7k

–

C3 0.1µ/50v

R3 510 1/2w

SP1 PKM22EPT

C4 10µ/35v

R4 27

D1-D4

1N4002

C1 0.1µ/50v

Q3 KRC243M

C 5

C 6

C 7

BUZZER

OVEN LAMP TURNTABLE MOTOR FAN MOTOR

MICRO

R6 3.3k

–

C5 10µ/35v

COM

D7D8

1SS270A1SS270A

RY2

C 8

C11

2ND. INTERLOCK RELAY CONTROL

C12

SWITCH

2ND. INTERLOCK RELAY CONTROL SWITCH

COM

B 2

B 1

Figure S-2. Power unitl Circuit

123456

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SENSOR DEFROST TURNTABLE OFF COOK

HELP

C11

0.1uF/50V

(J17) (J16)

(J15) (J14)

(J13)

(J12)

(J11)

(J10)

C13

47uF/16V

ZD10

UDZ4.3B

R15

C14

0.01uF/50V

R11

R19

4.7K

C10

R41

15K

R40

4.7K

C40

0.01uF/50V

R68

R69

R70

R71

R72

R73

R10

4.7K

R12

15K

CF1

4MHz

R79

R78

R77

R76

R75

R74

C65

C64

C63

C62

C61

C60

R67

R66

15K

R65

15K

R64

15K

R63

15K

R62

15K

R61

15K

R60

15K

G12

G11

G10

KEY UNIT

15K

4.7K

5 6 7

C-12

C-8

C-7

C-5

C-6

C-1

C-3

C-4

C-2

C12

0.1uF

50V

Q11

DTA143EAK

0.01uF/50V

15K

Q10

2SA1037AK

R16R17

R18

Q20

DTA143EAK

C20

0. 1uF

50V

Q30

Q21

DTA143EAK

DTA123JKA

D20 MA152WA

GND

INT

LED

OL,TTM,FM

BUZZER

MICRO

DOOR

C-11

F-1

F-2

F-3

CN-C

R90

R91

R96

D90

C90

0.1uF/50V

330

3.32KD

3.57KD

R92

1.8KF

R93

360KF

C91

0.1uF/50V

R94

4.7K

R95

15K

C92

C93

0.01uF

50V

0.01uF/50V

R97

15K

IC-2

R98

R99

R101

R102

620K

300K

150KF

75KF

37.4KF

4.7K

AIN0

AIN1

AIN2

AIN3

VL4

VL3

VL2

VL1

P44

CNTR0

P45

P20

P21 P22 P23 P24

AIN5

AIN4

P07

P06 P05

P04

P03 P02

P01

P00

LD10 LD11 LD12

LD13LD14

LD15

G14

P17

P16

P15

P14

AIN7

AIN6

COM0

COM5

SEG34

SEG39

COM15

COM8

C15

C16

C18

0.1uF/50V x4

G13

144

108

109

C17

MA152WA

C-10

C-9

STOP

CLEAR

CLOCK

TIMER

INSTANT

COOK

START

LESS

HELP

NOTE

: IF NOT SPECIFIED 1/10W ±5%

CN-F

AH SENSOR

BA4558

LOW FAT

MEALS

DESSERTS

VEGETABLES

EASY

DEFROST

EXPRESS

MEAL

SENSOR

REHEAT

EXPRESS

COOK

VEGETARIAN

MEALS

POWER

LEVEL

RICE/

PASTA

CN-G

QUICK &

EASY

EXPRESS

DEFROST

C60 - C65 330PF/50V

R74 - R79 270K

R68 - R73 15K

C15 - C18

COM5

COM4

COM3

COM2

COM1

COM0

VL1

VL2

VL3

VL4

VL5

C3C2C1

VLIN

VSS(NC)

VSS

P27

P26

P25

P24

P23

P22

P21

P20

P47

P46

P45

P44

P43

CNTR0

P41

INT0

P07

P06

SEG34

SEG35

SEG36

SEG37

SEG38

SEG39

SEG40

SEG41

SEG42

SEG43

SEG44

SEG45

SEG46

SEG47

SEG48

SEG49

SEG50

SEG51

SEG52

SEG53

SEG54

SEG55

SEG56

SEG57

SEG58

SEG59

SEG60

SEG61

SEG62

SEG63

SEG64

SEG65

SEG66

SEG67

COM15

COM14

COM6

COM7

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

SEG32

SEG33

COM16

COM15

COM14

COM13

COM12

COM11

COM10

COM9

SEG40

SEG39

SEG38

SEG37

SEG36

SEG35

SEG34

SEG33

SEG32

SEG31

SEG30

SEG29

SEG28

SEG27

SEG26

SEG25

SEG24

SEG23

SEG22

SEG21

SEG20

SEG18

SEG19

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

COM1

COM2

COM3

COM4

COM5

COM6

COM7

COM8

P05

P04

P03

P02

P01

P00

P17

P16

P15

P14

AIN7

AIN6

AIN5

AIN4

RESET

XCOUT

XCIN

VCC

OSCSEL

XOUT

VSS

XIN

AIN3

AIN2

AIN1

AIN0

COM8

COM9

COM10

COM11

COM12

COM13

IC-1

2345 6

Figure S3. CPU. Unit Circuit

123456

R-480J

2345 6

VRB

ZD1

(CN - C)

CN - C

SP1

WH - 1

B Q3

SH - B

SH - A

CN - B

RY2

QKITPB026MRE0

VRS1

D4 D2 D1

CN - A

OMIF

(CN - D)

(D10)

RY1

RY3

TTM

Figure S-4. Printed Wiring Board

123456

R-480J

PARTS LIST

Note: The parts marked "∆" may cause undue microwave exposure.

The parts marked "*" are used in voltage more than 250V.

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

ELECTRICAL PARTS

1- 1 RTHM-A120WRE0 Thermal cut-out 145 deg.C (Magnetron) 1 AH 1- 1 RTHM-A080WRE0 Thermal cut-out 145 deg.C (Magnetron) (Interchangeable) 1 AP 1- 1 RTHM-A112WRE0 Thermal cut-out 145 deg.C (Magnetron) (Interchangeable) 1 AG 1- 2 FPWBFA353WRKZ Noise filter 1 AS 1- 3 QSW-MA137WRE0 1st. latch switch, 2nd. interlock relay control switch 2 AH 1- 4 QSW-MA138WRE0 Monitor switch 1 AH 1- 5 RTHM-A119WRE0 Thermal cut-out 145 deg.C (Oven) 1 AK 1- 5 RTHM-A075WRE0 Thermal cut-out 145 deg.C (Oven) (Interchangeable) 1 AN 1- 6 QACC-A142WRZZ Power supply cord 1 AQ 1- 7 FH-DZA067WRK0 H.V. rectifier assembly 1 AQ

1- 7 FH-DZA069WRK0 H.V. rectifier assembly (Interchangeable) 1 AP

1- 8 RC-QZA293WRZZ High Voltage capacitor 1 AV

1- 9 RMOTEA405WRZZ Fan motor 1 AX 1- 9 RMOTEA390WRE0 Fan motor (Interchangeable) 1 AW 1-10 QFS-CA026WRZZ Fuse F10A 1 AE 1-11 QSOCLA024WRE0 Oven lamp socket 1 AH 1-12 RLMPTA078WRE0 Oven lamp 1 AL 1-12 RLMPTA069WRE0 Oven lamp (Interchangeable) 1 AK 1-13 RMOTDA253WRZZ Turntable motor 1 AV 1-13 RMOTDA173WRE0 Turntable motor (Interchangeable) 1 AX 1-14 RTRN-A685WRZZ Power transformer 1 BN

1-15 RV-MZA295WRE0 Magnetron 1 BF

∆*

1-16 QFS-IA010WRZZ H.V. fuse 0.80A 1 AQ

1-17 FDTCTA214WRKZ AH sensor assembly 1 AX

CABINET PARTS

2- 1 GCABUA711WRP0 Outer case cabinet 1 BC 2- 2 FDAI-A225WRYZ Bottom plate 1 BB 2- 3 GLEGPA074WRE0 Foot 4 AC

CONTROL PANEL PARTS

3- 1 DPWBFC436WRKZ Control unit assembly 1 BG 3- 2 DPNLCB907WRKZ Control panel frame with key unit 1 BB 3- 2-1 FUNTKB154WREZ Key unit 1 AX 3- 2-2 JBTN-B104WRF0 Open button 1 AE 3- 2-3 MSPRCA050WRE0 Open button spring 1 AB 3- 3 LHLD-A185WRF0 LCD holder 1 AL 3- 4 PSHEPA672WRE0 LED sheet 1 AK 3- 5 XEPSD30P08XS0 Screw ; 3mm x 8mm 4 AA

OVEN PARTS

4- 1 PHOK-A130WRFZ Latch hook 1 AK

∆

4- 2 LBNDKA132WRP0 Capacitor holder 1 AD 4- 3 PCOVPA374WRPZ High voltage cover 1 AG 4- 4 NFANJA020WRE0 Fan blade 1 AG

∆

4- 5 FOVN-A475WRTZ Oven cavity 1 BH 4- 6 LANGTA316WRP0 Chassis support 1 AH 4- 7 MLEVPA244WRFZ Switch lever 1 AG 4- 8 PCUSGA536WRP0 Cushion 1 AE 4- 9 PCOVPA311WRE0 Waveguide cover 1 AG 4-10 PCUSUA191WRP0 Cushion 1 AC 4-11 PDUC-A610WRF0 Fan duct 1 AR 4-12 PDUC-A611WRW0 Magnetron air duct 1 AC 4-13 PPACGA176WREZ Turntable motor packing 1 AC 4-14 PCUSUA410WRP0 Cushion 1 AB 4-15 PCUSUA455WRP0 Cushion 1 AD 4-16 PPACGA073WRE0 Cushion 1 AP 4-17 PCUSUA452WRP0 Cushion 1 AB 4-18 LSTPPA167WRF0 Door stopper 1 AG 4-19 PCUSUA237WRP0 Cushion 1 AF 4-20 PDUC-A778WRPZ AH sensor duct 1 BC 4-21 PCUSGA531WRP0 Cushion 1 AF 4-22 PCUSGA532WRP0 Cushion 1 AF

DOOR PARTS

∆

5 CDORFA927WRKZ Door assembly 1 BK

∆

5- 1 FDORFA290WRT0 Door panel 1 BA 5- 2 HPNL-A692WRR0 Door screen 1 AX

Note: The parts marked "∆" may cause undue microwave exposure.

The parts marked "*" are used in voltage more than 250V.

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

∆

5- 3 GWAKPA813WRRZ Door frame 1 AX

∆

5- 4 GCOVHA382WRF0 Choke cover 1 AM 5- 5 PSHEPA336WRP0 Sealer film 1 AF

∆

5- 6 LSTPPA139WRF0 Latch head 1 AF 5- 7 MSPRTA084WRE0 Latch spring 1 AD 5- 8 XEPSD40P06000 Screw; M4 x 6 3 AA

MISCELLANEOUS

6- 1 FW-VZB752WRE0 Switch harness 1 AG 6- 2 FW-VZB936WREZ Main wire harness 1 AU 6- 3 FROLPA097WRKZ Turntable support 1 AN 6- 4 TLABMB009WRRZ Menu label 1 AK 6- 5 TCAUHA214WRR0 K caution label 1 AC 6- 6 TINSEB062WRRZ Operation manual 1 AP 6- 7 NTNT-A108WREZ Turntable tray 1 AW

SCREWS, NUTS AND WASHERS

7- 1 XHTSD40P08RV0 Screw; M4 x 8 9 AA 7- 2 LX-CZ0052WRE0 Special screw 2 AA 7- 3 LX-EZA042WRE0 Special screw 2 AB 7- 4 XHPSD30P06000 Screw; M3 x 6 4 AA 7- 5 XHPSD40P08K00 Screw; M4 x 8 5 AA 7- 6 XHPSD40P08000 Screw; M4 x 8 4 AA 7- 7 LX-EZA050WRE0 Special screw; 1 AB 7- 8 XOTSD40P12RV0 Screw; M4 x 12 12 AB 7- 9 XOTSD40P08000 Screw; M4 x 8 2 AA

R-480J

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER

2. REF. NO.

3. PART NO.

4. DESCRIPTION

PACKING AND ACCESSORIES

DOOR PROTECTION SHEET

SPADPA204WRE0

FOAM SHEET

SPAKHA013WREZ

6- 6 OPERATION MANUAL

6-7 TURNTABLE TRAY

TOP PAD ASSEMBLY

FPADBA317WRK0

PLASTIC BAG

SSAKHA032WRE0

BOTTOM PAD ASSEMBLY

FPADBA318WRK0

INTO THE OVEN CAVITY

6-3 TURNTABLE SUPPORT

TRAY PACK

SPADFA389WRE0

PACKING CASE SPAKCE113WREZ

Not replaceable items.

R-480J

OVEN AND CABINET PARTS

7-4

1-17

2345 6

7-8

2-1

7-8

7-1

4-11

1-5

4-14

1-10

6-5

1-6

7-5

4-20

4-22

4-5

7-1

7-7

7-4

1-2

7-5

1-1

6-4

7-1

1-15

7-6

7-5

4-6

4-8

4-15

4-9

4-7

4-13

6-7

1-13

1-3

7-5

4-1

1-4

7-2

7-3

4-4

1-11

1-12

1-9

4-19

7-1

1-3

1-14

4-16

7-1

4-17

2-2

6-3

4-2

1-8

4-12

4-21

1-16

7-1

1-7

4-3

2-3

7-8

7-1

7-8

123456

2-3

4-10

7-9

2-3

R-480J

CONTROL PANEL PARTS

3-2

3-2-1

2345 6

3-5

3-3

3-5

3-4

3-1

DOOR PARTS

4-18

3-2-3

5-4

5-8

5-5

3-2-2

5-1

5-3

5-8

5-2

5-6

5-7

MISCELLANEOUS

6-2

6-1

Actual wire harness may be different from illustration.

123456

R-480J

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

'04SHARP CORP. (08S0.CD_E)

Sharp R-480J User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

WARNING

PRODUCT SPECIFICATIONS

GENERAL INFORMATION

APPEARANCE VIEW

OPERATION SEQUENCE

FUNCTION OF IMPORTANT COMPONENTS

TROUBLESHOOTING GUIDE

TEST PROCEDURES

A MAGNETRON TEST

B POWER TRANSFORMER TEST

C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST

D HIGH VOLTAGE CAPACITOR TEST

E SWITCH TEST

F NOISE FILTER TEST

G THERMAL CUT-OUT TEST

H MOTOR WINDING TEST

I BLOWN FUSE F10A

J HIGH VOLTAGE FUSE TEST

K TOUCH CONTROL PANEL ASSEMBLY TEST

L KEY UNIT TEST

M RELAY TEST

O AH SENSOR TEST

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

ABSOLUTE HUMIDITY SENSOR CIRCUIT

TOUCH CONTROL PANEL SERVICING

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING FOR WIRING

OUTER CASE REMOVAL

POWER TRANSFORMER REMOVAL

MAGNETRON REMOVAL

HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL

TURNTABLE MOTOR REMOVAL

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

OVEN LAMP AND LAMP SOCKET REMOVAL

CONTROL PANEL ASSEMBLY REMOVAL

COOLING FAN MOTOR REMOVAL

POWER SUPPLY CORD REPLACEMENT

DOOR REPLACEMENT

SEALER FILM

MICROWAVE MEASUREMENT

PARTS LIST

HOW TO ORDER REPLACEMENT PARTS

PACKING AND ACCESSORIES

OVEN AND CABINET PARTS