Sharp R-24AT, R-22AT User Manual

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1900W/R-2

R-22AT R-24AT

SERVICE MANUAL

SY520R24ATK//

COMMERCIAL

MICROWAVE OVEN

DOUBLE

EXPRESS

QUANTITY

DEFROST

4AT

POWER LEVEL

MANUAL/ REHEAT

STOP / CLEAR

START

SET

CHECK

VOLUME

MODELS

R-22AT R-24AT

R-24AT

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

This revised service manual is applied to

R-22AT from serial No. 050505509 and

R-24AT from serial No. 050508658.

Because many parts have been changed to improve quality of these models from May 2005 production.

And the changed parts are not interchangeable. Please use this service manual for above products.

For old products, please use old service manual (No.SX910R24ATK//) and technical reports.

TABLE OF CONTENTS

Page

SERVICING ................................................................................................................. INSIDE FRONT COVER

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

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

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

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

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

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

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

TROUBLESHOOTING GUIDE .......................................................................................................................... 7

TEST PROCEDURE .......................................................................................................................................... 8

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

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 24

MICROWAVE MEASUREMENT .................................................................................................................... 31

WIRING DIAGRAM ......................................................................................................................................... 32

PICTORIAL DIAGRAM ................................................................................................................................... 34

CONTROL PANEL CIRCUIT ...........................................................................................................................35

PRINTED WIRING BOARD .............................................................................................................................36

PARTS LIST ................................................................................................................................................... 37

SHARP CORPORATION

R-22AT R-24AT

SERVICING

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts will result in electrocution. High voltage capacitors, High voltage transformers, Magnetrons, High voltage rectifier assembly, High voltage fuses, High voltage harness.

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high two voltage capacitors.

WARNING: AGAINST THE CHARGE OF THE TWO

HIGH-VOLTAGE CAPACITORS.

The two high-voltage capacitors remain charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the two high-voltage capacitors (that is, of the connecting lead of the high-voltage rectifier) against the chassis with 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 one (1) minut. When the one minute has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out 3D checks and re-examine the connections to the component being tested.

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

SERVICE MANUAL

COMMERCIAL

MICROWAVE OVEN

R-22AT/ R-24AT

GENERAL IMPORTANT INFORMATION

PRODUCT SPECIFICATIONS

APPEARANCE VIEW

R-22AT R-24AT

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

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

CAUTION

MICROWAVE RADIATION

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

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

WARNING

Never operate the oven until the following points are ensured. (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (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.

OPERATING SEQUENCE

FUNCTION OF IMPORTANT COMPONENTS

SERVICING AND TROUBLESHOOTING CHART

TEST PROCEDURE

TOUCH CONTROL PANEL ASSEMBLY

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

MICROWAVE MEASUREMENT

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

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

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

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

SHARP CORPORATION

OSAKA, JAPAN

WIRING DIAGRAM

PARTS LIST

R-22AT R-24AT

PRODUCT DESCRIPTION

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 230 - 240 Volts

50 Hertz

Single phase, 3 wire earthed Power Comsumption Power Output

Case Dimensions Width Height Depth

Cooking Cavity Dimensions Width Height Depth

Control Complement for Touch Control System

2.4 kW Approx. 11 A [R-22AT] / 2.9 kW Approx. 13 A [R-24AT]

1500 W [R-22AT]/ 1900 W [R-24AT] nominal of RF microwave energy

(measured by method of IEC 60705)

Operating frequency 2450 MHz

510mm 335 mm 470mm

330 mm 180 mm 330mm

The combination of cooking time and microwave power

The oven can be programmed a series of up to 3 cookling stages.

The combination of microwave power and cooking time that can be input as

folllows.

Cooking Sequence Micrwave power levelthat can be iused. Cooking time that can be iused.

1 Stage only 0-100% Max. 30 minutes

0-40% all stages Max. 30 minutes any stages

2 or 3 Stage

50-100% Max. 30 minutes for 3 stages

Max. 60 minutes for 2 stages Max. 90 minutes for 3 stages

NOTE:If the oven used with the power level above 40% on any stage, the

maximum cooking time is 30 minutes in total.

Microwave Power level

100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%

MANUAL / REPEAT key, NUMBER keys

POWER LEVEL key, STOP / CLEAR key

START Key, DOUBLE QUANTITY key

EXPRESS DEFROST key, SET key

CHECK key, VOLUME key

CSet Weight Approx. 33 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

R-22AT

R-24AT

OVEN

1. Control panel

2. Hole for safety door latches

3. Ceramic floor

4. Splash cover

5. Oven light

6. Air intake filter

7. Air intake openings

8. Oven cavity

9. Door seals and sealing surfaces

10. Door hinges

11. Oven door with see-through window

12. Door safety latches

13. Door handle.

14. Outer cabinet

15. Removable cover over oven light bulb

16. Air vent openings

17. Power supply cord 18 Mounting plate 19 Screw for mounting plate

DISPLAY AND INDICATORS

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

1. Heating indicator This indicator shows cooking in progress.

2. Memory number indicator

3. Express defrost

4. Check mode indicator

5. Power level display

6. Time display

7. Filter indicator

8. Double quantity mode indicator

9. 3rd. stage indicator

10. 2nd. stage indicator

11. 1st. stage indicator

OPERATING KEYS

12. DOUBLE QUANTITY key

13. EXPRESS DEFROST key

14. NUMBER keys

15. MANUAL/ REPEAT key

16. STOP/CLEAR key

17. POWER LEVEL key

18. START key

19. SET key

20. VOLUME key

21. CHECK key

APPEARANCE VIEW

AUTO TOUCH CONTROL PANEL

NUMBER

DOUBLE

QUANTITY

MANUAL/

REPEAT

POWER LEVEL

SET CHECK VOLUME

1 2 3

679

DEF

CHECK

DOUBLE

FILTER

EXPRESS DEFROST

STOP / CLEAR

START

POWER

7 8 9

INSTALLATION INFORMATION

When this commercial microwave oven is installed near other commercial electrical appliances, connect a lead wire to each equivalent potential terminal with equipotential marking between them (insert a lead wire between a washer and an earth angle, and screw them), as shown in Fig. A-1, to make sure that they are at equivalent potential. If any lead wire is not connected between them, when person touch them he/she will get a electric shock.

COMMERCIAL MICROWAVE OVEN OTHER COMMERCIAL

Equipotential marking

Lead wire

Screw

Washer

Earth angle (Equivalent potential terminal)

Lead wire

Figure A-1

ELECTRICAL APPLIANCE

Equivalent potential terminal

R-22AT R-24AT

OPERATION SEQUENCE

Closing the door activates all door interlock switches (interlock switches and stop 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 (230 - 240 volts, 50Hz), the line voltage is supplied to the control unit through the noise filter.

Figure O-1 on page 32

1. The digital display shows .

IDLE CONDITION

When the door is opened, the contacts of the interlock switches SW1+SW2 and stop switch SW5 open, initiating the following:

Figure O-2 on page 32

1. A signal is input to the control unit energizing the coil of shut-off relay RY-1.

2. The shut-off relay RY-1 contacts close completing circuits to turn on the oven lamp, blower motor and antenna motors.

3. If the door remains open, 60 seconds later the control unit de-energizes shut-off relay RY-1 turning off the oven lamp, blower motor and antenna motors.

When the door is closed, the contacts of the interlock switches SW1+SW2 and stop switch SW5 close. With the closing of the stop switch SW5 contacts, an additional circuit is provided which will permit the operation of the oven when one of the touch pads is depressed. Since the control is enabled through the stop switch SW5, the door must be closed before the touch pads will be effective. When the door is closed, a full 60 second IDLE condition is always provided for selecting and pressing the desired touch pads. A 60 second IDLE condition will also follow the end of each cook cycle.

MICROWAVE COOKING CONDITION

Touch MANUAL/REPEAT key and enter a desired cooking time with the touching NUMBER key. And then touch START key.

NOTE: The programme and the check are canceled

when any keys are not touched for more than 3 minutes during programming.

Function sequence Figure O-3 on page 33

CONNECTED COMPONENTS RELAY Oven lamp/ Blower motor/ Antenna motors RY1 High voltage transformer T1 RY3 High voltage transformer T2 RY4

1. The line voltage is supplied to the primary winding of the two high voltage transformers. 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 RY3+RY4 go back to their home position. The circuits to the high voltage transformers T1+T2. The relay RY1 remains and oven lamp, blower motor and antenna motors work for 1 minute.

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

CONDITION DURING DOOR OPEN

SWITCH CONTACT COOKING Interlock switches COM-NO Closed Open Monitor switches COM-NC Open Closed Stop switch COM-NO Closed Open

(NO COOKING)

The circuits to the high voltage transformers T1+T2 are cut off when the interlock and stop switches SW1+SW2+SW5 are made open. The blower motor BM, antenna motors and oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because the relay RY1 stays closed. Shown in the display is the remaining time, but the program is cancelled if the oven is not started within 1 minute.

6. MONITOR SWITCH CIRCUIT The monitor switches SW3+SW4 are mechanically controlled by oven door, and monitors the operation of the interlock switches SW1+SW2.

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

cycle of a cooking program, the interlock switches SW1+SW2 and stop switches SW5 must open their contacts first. After that the contacts (COM-NC) of the monitor switches SW3+SW4 can be closed.

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

NC) of the monitor switches SW3+SW4 must be opened first. After that the contacts (COM-NO) of the interlock switches SW1+SW2 and stop switch SW5 must be closed.

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

interlock switch SW1 (or SW2) remain closed, remains closed, the fuse F1 F10A (or F2 F10A) will blow, because the monitor switch SW3 (or SW4) is closed and a short circuit is caused.

MICROWAVE VARIABLE COOKING

When the microwave oven is preset for variable cooking power, the line voltage is supplied to the high voltage transformers T1+T2 intermittently within a 48 second time base through the contacts of the relays RY3+RY4. The following levels of microwaves power are given.

48 sec. ON

Number key

44sec. ON

Number key 9

40 sec. ON

Number key 8

36 sec. ON

Number key 7

32 sec. ON

Number key 6

26 sec. ON

Number key 5

22 sec. ON

Number key 4

16 sec. ON

Number key 3

12 sec. ON

Number key 2

8 sec. ON

Number key 1

0 sec. ON

Number key 0

NOTE: The ON/OFF time ratio does not exactly corre-

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

R-22AT R-24AT

TWO MAGNETRON OPERATION SYSTEM

Two magnetrons MG1+MG2 are equipped in order to get higher microwave power output. The primary windings of the high voltage transformers T1+T2 are connected so that each magnetron can be oscillated alternatively according to the frequency of the power supply. Refer to the Figure B-1 and B-2.

T2: HIGH VOLTAGE TRANSFORMER

(REAR)

H. V. FUSE H. V. FUSE

H. V. RECTIFIER

MG2: MAGNETRON (LOWER)

C2: H.V. CAPACITOR

H. V. RECTIFIER

Figure B-1. High Voltage Circuit

OPERATION OF MAGNETRON

MG1: MAGNETRON (UPPER)

T1: HIGH VOLTAGE TRANSFORMER

(FRONT)

C1: H.V. CAPACITOR

COMMERCIAL FREQUENCY (50HZ)

POWER OUTPUT BY MAGNETRON T1

POWER OUTPUT BY MAGNETRON T2

Figure B-2. Operation of Magnetron

R-22AT R-24AT

FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM

1. The door release lever is pulled.

2. The upper latch head is lifted up by the linked door release lever.

3. The head lever is lifted up by the door release lever.

4. The joint lever is lifted up by the head lever.

5. The lower latch head is lifted up by the joint lever.

6. Now both latch heads are lifted up, so they can be released from the latch hook.

7. Now the door can be opened.

Door release lever

Joint lever

Head lever

Latch head

Latch hook

SW4: Monitor switch

(Oven side)

SW3: Monitor switch

SW2: Interlock switch

(Oven side)

SW1: Interlock switch

SW5: Stop switch

Figure D-1. Door Open Mechanism

INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5

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

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

MONITOR SWITCHES SW3, SW4

The monitor switches SW3, SW4 are activated (the contacts opened) the upper latch head and switch lever A while the door is closed. The switch SW3 (or SW4) is intended to render the oven inoperative by means of blowing the fuse F1 F10A (or F2 F10A) when the contacts of the interlock switch SW1 (or SW2) fail to open when the door is opened.

Function

1. When the door is opened, the monitor switches SW3 +SW4 contacts close (to the ON condition) due to their being normally closed. At this time the interlock switch SW1+SW2 are in the OFF condition (contacts open) due to their being normally open contact switches.

2. As the door goes to a closed position, the monitor switches SW3+SW4 contacts are opened and interlock switch SW1+SW2 contacts are closed (On opening the door, each of these switches operate inversely.)

3. If the door is opened and the interlock switch SW1 (or SW2) contacts fail to open, the fuse F1 F10A (or F2 F10A) blows simultaneously with closing of the monitor switch SW3 (or SW4) contacts.

CAUTION:BEFORE REPLACING A BLOWN FUSE F1

F10A (OR F2 F10A) TEST THE INTERLOCK SWITCH SW1 (OR SW2) AND MONITOR SWITCHE SW3 (OR SW4) FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

NOISE FILTER

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

FUSES F1, F2 F10A 250V

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

2. The fuse F1 F10A (or F2 F10A) also blows when interlock switch SW1 (or SW2) remains closed with the oven door open and when the monitor switches SW3 (or SW4) closes.

WEAK POINT F3

If the wire harness or electrical components make a shortcircuit, this weak point F3 blows to prevent an electric shock or fire hazard.

HIGH VOLTAGE FUSE(S) F4, F5

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

MAGNETRON TEMPERATURE FUSES TF1, TF2

The temperature fuses TF1, TF2 located on the top of the upper and lower waveguide, are designed to prevent damage to the magnetrons MG1, MG2. If an over heated condition develops in the tube due to blower motor failure, obstructed air ducts, dirty or blocked air intake, etc., the circuit to the magnetrons are interrupted. Under normal operation, the temperature fuses remains closed. However, when abnormally high temperatures are generated within the magnetrons, the temperature fuses will open at 150˚C causing the microwave energy to stop. The defective temperature fuses must be replaced with new rated ones.

EXHAUST TEMPERATURE FUSE TF3

The temperature fuse TF3, located on the side of the exhaust duct assembly, is designed to prevent damage to the oven by fire. If the food load is overcooked, by either error in cook time or defect in the control unit, the temperature fuse will open. Under normal operation, the oven temperature fuse remains closed. However, when abnormally high temperatures are generated within the oven cavity, the oven temperature fuse will open at 120˚C, causing the oven to shut down. The defective temperature fuse must be replaced with new rated one.

R-22AT R-24AT

EXHAUST OVEN THERMISTOR TH3

The thermistor is a negative temperature coefficient type. The temperature in the exhaust duct is detected through the resistance of the thermistor. If the temperature is high, the control panel will display “EE7” and the oven will stop to avoid overheating and catching fire. If the thermistor is open, the control panel will display "EE6" and the oven will stop.

MAGNETRON THERMISTORS TH1, TH2

The thermistor is a negative temperature coefficient type. The air temperature around the magnetron is detected through the resistance of the thermistor. If the temperature is high, the control panel will display "EE17" and the oven will stop to protect the lower magnetron against overheat. If the magnetron thermistor is open, the control panel will display "EE16" and the oven will stop. If the magnetron thermistor is short, the control panel will display "EE19" and the oven will stop.

BLOWER MOTOR BM

The blower motor BM drives a blade which draws external cool air into the oven. This cool air is directed through the air vanes surrounding the magnetrons and cools the magnetrons. 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.

ANTENNA MOTORS SM

The upper and lower antenna motors SM drive stirrer antennas.

OVEN LAMP OL

The oven cavity light illuminates the interior of the oven so that food being cooked can be examined visually through the door window without having to open the door. The oven lamp is on during the cooking cycle and idle condition.

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 F1 F10A (or F2 F10A) in the interlock switch

SW1 (or SW2) - monitor switches SW3 (or SW4) , check the interlock switch SW1 (or SW2) and monitor switches SW3 (or SW4) before replacing the fuse F1 F10A (or F2 F10A).

R-22AT R-24AT

EEP ROM I-2

N KEY UNIT

TOUCH CONTROL TRANSFORMER T3 Due to programme lock Over the max. cooking time No power at wall outlet HOME FUSE or BREAKER

Mis adjustment of switches P FUSE 2.5A O RELAY RY-4 O RELAY RY-3 O RELAY RY-1 M TOUCH CONTROL PANEL

Opened wire harness

Shorted wire harness

POWER SUPPLY CORD K NOISE FILTER

OVEN LAMP OR SOCKET J BLOWER MOTOR BM J ANTENNA MOTORS SM

I EXHAUST THERMISTOR TH3 I MAGNETRON THERMISTOR (Lower) TH2

I MAGNETRON THERMISTOR (Upper) TH1 L HIGH VOLTAGE FUSE F5 L HIGH VOLTAGE FUSE F4 H EXHAUST TEMPERATURE FUSE TF3 H MAGNETRON TEMPERATURE FUSE TF2 H MAGNETRON TEMPERATURE FUSE TF1 F WEAK POINT F3 G FUSE F10A F2 G FUSE F10A F1 E STOP SWITCH SW5 E MONITOR SWITCH SW4 E MONITOR SWITCH SW3 E NTERLOCK SWITCH SW2 D INTERLOCK SWITCH SW1 D H.V. CAPACITOR C2 D H.V. CAPACITOR C1

H.V. WIRE HARNESS C H.V. RECTIFIER ASSEMBLY FOR MG2 C H.V. RECTIFIER ASSEMBLY FOR MG1 B HIGH VOLTAGE TRANSFORMER T2 (Rear) B HIGH VOLTAGE TRANSFORMER T1 (Front) A MAGNETRON MG2 (Lower) A MAGNETRON MG1 (Upper)

TESTPROCEDURE

AND

POSSIBLE CAUSE

DEFECTIVE PARTS

PROBLEM

“ . “ does not appear on display when power cord is plugged into

wall outlet.

Control panel can not accept key in.

Fuse F1 or F2 blows when the door is opened.

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

Weak point F3 blows when power cord is plugged into wall outlet.

Oven lamp, fan motor and antenna motors do not work for 1

minute when the door is opened or after cooking.

Fuse F1 or F2 blows when power cord is plugged into wall outlet.

Oven lamp does not light when door is opened. (Blower and antenna

motors work)

Blower motor does not work when door is opened. (Oven lamp

lights and antenna motors work)

“EE 1” (Magnetron MG1 failure)

“EE 2” (Magnetron MG2 failure)

“EE 3” (Magnetron MG1 and MG2 failure)

“EE 6” (Exhaust thermistoropen)

“EE 7” (Exhaust air temperature is high)

“EE 9” (Exceeded max. heating time)

Oven lamp, blower motor and antenna motors do not work.

OFF

CONDITION

Oven lamp does not work.

Blower motor does not work.

Oven does not stop after end of cooking cycle.

Home fuse blows when starting the oven.

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

It passed more than 1 minute after cooking but oven lamp, blower

motor and stirrer motors do not stop.

“EE 16” (Thermistor of magnetron are open.)

“EE 17” (Magnetron temperature is high.)

“EE 19” (Magnetron thermistor short)

“EE 10” (Fault of memory)

Antenna motors do not work.

CONDITION

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

A MAGNETRON TEST

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

R-22AT R-24AT

CARRY OUT

3D CHECKS.

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 way of IEC 60705, i.e. it is measured by how much power the water load can absorb. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W) heating works for t(second), approximately P x t/4.187 calorie is generated. On the other hand, if the temperature of the water with V(ml) rises ∆T (°C) during this microwave heating period, the calorie of the water is V x ∆T.

The formula is as follows;

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

Our condition for water load is as follows:

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

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

Heating time ................

28 sec. [R-22AT] / 22sec. [R-24AT]

Mass of container (mc) .....

330 g

T2 ......... Final Temperature P = 150 x ∆T [R-22AT] / P = 190 x ∆T [R-24AT]

Measuring condition:

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

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

3. Temperature of the water The initial temperature of the water is (10±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 be 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 until the temperature of the water rises by a value ∆ T of (10 ± 2) K.

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

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

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

R-22AT R-24AT

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

Room temperature ................................................................................................. T0 = 21°C

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

Temperature after (28 + 3) = 31 sec [for R-22AT].................................................. T2 = 21°C

Temperature after (22 + 3) = 25 sec [for R-24AT].................................................. T2 = 21°C

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

Measured output power

The equation is “P = 150 x ∆T” [for R-22AT] ........................... P = 150 x 10°C = 1500 Watts

The equation is “P = 190 x ∆T” [for R-24AT] ........................... P = 190 x 10°C = 1900 Watts

JUDGMENT: The measured output power should be within the range of ± 15 % of the rated output

power.

CAUTION: 1° C CORRESPONDS TO 150 WATTS [R-22AT]/ 190 WATTS [R-24AT]. REPEAT

MEASUREMENT IF THE POWER IS INSUFFICIENT.

1000g

T1˚C

1000g

T2˚C

Heat up for 31 sec. for R-22AT Heat up for 25 sec. for R-24AT

MICROWAVE OUTPUT POWER (2000 cc alternative method)

The power output of this oven is rated using the method specified by IEC 60705. Full details of how to curry out this procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre (part number SERV-LITMW01).

The IEC-60705 procedure must be carried out using laboratory-type procedures and equipment.

These requirements make the procedure unsuitable for routine performance checks.

NOTE: The following test method gives an indication of the output power only, it cannot be used to

establish the actual/rated output power. If the true output power is required, then the IEC60705 test method must be used.

Alternative simplified method:

1. Place 2 litres of cold water (between 12°C and 20°C) in a suitable container.

2. Stir the water and measure the temperature in °C. Note temperature as T1.

3. Place the container in the microwave and heat the water for 56 sec. [R-22AT]/ 44 sec. [R-24AT] on fill power.

4. When the 56 sec. [R-22AT]/ 44 sec. [R-24AT] is completed, remove the container and stir the water. Note temperature as T2.

5. Calculate the output power using the following formula: R.F. Power Output = (T2 - T1) x 150 for R-22AT. R.F. Power Output = (T2 - T1) x 190 for R-24AT.

NOTE: The result from this test should be within the allowance of 2000cc alternative method.

(±10%).

MICROWAVE LEAKAGE TEST This oven should be tested for microwave leakage on completion of any repair or adjustment, following the procedure described in the Sharp Technical Training notes (part number SERV-LITMW01). The maximum leakage permitted in BS EN 60335-2-25 is 50W/m2 (equivalent to 5W/m2), however it is not normal to detect any significant leakage, therefore, any leakage which is detected should be investigated.

It is essential that only leakage detectors with current calibration traceable to National Physical Laboratories are used.

Suitable leakage detectors: CELTEC A100

APOLLO X1

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

B HIGH VOLTAGE TRANSFORMER TEST

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

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

CARRY OUT 3D CHECKS. Disconnect the leads to the primary winding of the high voltage transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three windings. The following readings should be obtained:

R-22AT R-24AT a. Primary winding approximately 1.8 Ω approximately 1.2 Ω b. Secondary winding approximately 75 Ω approximately 75 Ω c. Filament winding less than 1 Ω

If the readings obtained are not stated as above, then the high voltage transformer is probably faulty and should be replaced. CARRY OUT 4R CHECKS.

R-22AT R-24AT

C HIGH VOLTAGE RECTIFIER ASSEMBLY 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.

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 3D CHECKS.

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

resistance range.

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

after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ

resistance. F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance. G. The resistance across all the terminals and the chassis must be infinite when the capacitor is

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

HIGH VOLTAGE RECTIFIER

CARRY OUT 4R CHECKS.

E SWITCH TEST

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

R-22AT R-24AT

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

Table: Terminal Connection of Switch

Plunger Operation COM to NO COM to NC

Released Open circuit Short circuit Depressed Short circuit Open circuit

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

CARRY OUT 4R CHECKS.

F WEAK POINT F3 TEST

CARRY OUT 3D CHECKS.

If the weak point F3 is blown, there could be a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.

CARRY OUT 4R CHECKS.

CAUTION: Only replace weak point F3 with the correct value replacement.

G FUSE F1, F2 F10A TEST

COM; Common terminal, NO; Normally open terminal NC; Normally close terminal

CARRY OUT 3D CHECKS.

If the fuse F1 F10A (or F2 F10A) is blown when the door is opened, check the interlock switch SW1 (or SW2) and monitor switch SW3 (or SW4). If thefuse F1 F10A (or F2 F10A) is blown by incorrect door switching replace the defective switch(s) and the fuse F1 F10A (or F2 F10A).

CARRY OUT 4R CHECKS.

CAUTION: Only replace fuse F1 F10A (or F2 F10A) with the correct value replacement.

H TEMPERATURE FUSE TF1, TF2, TF3 TEST

1. CARRY OUT 3D CHECKS.

2. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches specfied temperature as shown below.

Open Close Display or temperature temperature Condition Check point

Magnetron temperature fuse (Upper)

TF1

Magnetron temperature fuse (Lower)

Exhaust temperature fuse

TF2

TF3

150˚C

120˚C

Non resetable type

EE1

EE3

EE2

Oven shut off

Magnetron Test magnetron

Magnetron MG1, MG2 Failure: Test magnetron MG1, MG2. Check blower motor and ventilation opening.

Magnetron MG2 Failure: Test magnetron

Food has been burned in oven. Temperature of oven inside is very high.

MG1 Failure:

MG1 and Blower motor.

MG2 and Blower motor.

3. CARRY OUT 4R CHECKS.

CAUTION: IF THE temperature fuse INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,

REPLACE temperature fuse.

I THERMISTOR TH1, TH2, TH3 TEST

1. CARRY OUT 3D CHECKS.

2. Follow the procedures below for each thermistor.

2-1. THERMISTOR TEST Disconnect the connector of the thermistor from the switch harness. Measure the resistance of the magnetron thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Resistance: Approx. 500 kΩ -- 1 MΩ

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

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

3. CARRY OUT

4R CHECKS.

J MOTOR WINDING TEST

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

Resistance of Blower motor should be approximately 60Ω. Resistance of Antenna motor should be approximately 8.8 kΩ.

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R CHECKS.

K NOISE FILTER TEST

CARRY OUT 3D CHECKS.

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

MEASURING POINT INDICATION OF OHMMETER

Between N and L Approx. 680 kΩ

Between terminal N and WHIT Short circuit

Between terminal L and BLK Short circuit

If incorrect readings are absorbed, replace the noise filter.

CARRY OUT 4R CHECKS.

LINE CROSS CAPACITOR 0.22µF/ AC250V

LINE CROSS CAPACITOR

10000 pF/ AC250V

WHT

NOISE FILTER

F3 : WEAK POINT

NOISE SUPPRESSION COIL

DISCHARGE RESISTOR 680 kΩ 1/2W

DISCHARGE RESISTOR 10 MΩ 1/2W

LINE CROSS CAPACITOR

10000 pF/ AC250V

R-22AT R-24AT

BLK

L HIGH VOLTAGE FUSE F4, F5 TEST

CARRY OUT 3D CHECKS.

If the high voltage fuse F4 (or F5) is blown, there could be a short in the high voltage rectifier or the magnetron MG1 (or MG2). Check them and replace the defective parts and the high voltage fuse F4 (or F5).

CARRY OUT 4R CHECKS.

CAUTION: Only replace high voltage fuse with the correct value replacement.

M TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, IC, 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, 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 the pads, sometimes a pad produces no signal.

2. Control Unit The following symptoms may indicate a defective control unit. Replacing the control unit. Before replacing the control unit, perform the key unit test (Procedure N) to determine if control unit is faulty.

2-1 Programming problems.

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

2-2 Display problems.

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

R-22AT R-24AT

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

f) A certain group of indicators do not light up. g) The figure of all digits flicker.

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

a) Buzzer does not sound or continues to sound. b) Cooking is not possible.

N KEY UNIT TEST

CARRY OUT 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 stop switch operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the stop switch is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the stop switch is closed (either close the door or short the stop 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 4R CHECKS.

O RELAY TEST

CARRY OUT 3D CHECKS.

Remove the outer case and check voltage between Pin Nos. 3 and 5 of the connector (A) on the control unit with an A.C. voltmeter. The meter should indicate 230 - 240 volts, if not check control unit circuity.

3D CHECKS.

G10

G11

G12

G2 G3 G4 G5 G6 G7 G8

RY1, RY3 and RY4 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. 25.9V D.C. Oven lamp, Blower motor and Antenna motors RY3 APPROX. 25.0V D.C. High voltage transformer (MG1) RY4 APPROX. 25.0V D.C. High voltage transformer (MG2)

CARRY OUT 4R CHECKS.

P PROCEDURES TO BE TAKEN WHEN THE FUSE ON THE PRINTED WIRING BOARD(PWB) IS

OPEN

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

Problem: POWER ON, indicator does not light up.

CARRY OUT 3D CHECKS.

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

STEPS OCCURRENCE CAUSE OR CORRECTION

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

POWER terminal of CPU connector (CN-A).

2 The rated AC voltage is present at primary Touch control transformer or secondary circuit defective.

side of touch control transformer. Check and repair.

3 Fuse on the PWB is open. Replace the fuse with new one.

(CARRY OUT 3D CHECKS BEFORE REPAIR)

NOTE: *At the time of these repairs, make a visual inspection of the varistor for burning damage

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

CARRY OUT 4R CHECKS.

R-22AT R-24AT

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

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

(1) Control Unit (2) Key Unit

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

1. Control Unit

Signal of key touch and oven function control are all processed by one microcomputer.

1) Power Supply Circuit

This circuit changes output voltage at the secondary side of the touch control transformer to voltages required at each part by full wave rectifying circuit, constant voltage circuit, etc..

2) Reset Circuit

This is an Auto-clear Circuit, i.e., a reset circuit, which enables IC1 to be activated from initial state.

3) Power Synchronizing Signal Generating Circuit

This is a circuit for generating power synchronizing signal by virtue of the secondary side output of touch control transformer. This signal is used for a basic frequency to time processing and so on.

4) Clock Circuit

This is a circuit for controlling clock frequency required for operating I-1.

5) I-1 (Main Processor)

This is a one-chip microcomputer, responsible for controlling the entire control unit.

6) I-2 (Memory Processor)

This is a memory IC, responsible for memory function.

7) Display Circuit

This is a circuit for driving display tubes by I-1 output.

8) Key Input Circuit

This is a circuit for transmitting key input information to I-1.

9) Sound-body Driving Circuit

This is a circuit for driving sound body by I-1 output.

10) Relay Driving Circuit

This is a circuit for driving output relay by I-1 output.

11) Stop Switch Circuit

This is a circuit for driving I-1 to detect door opening/ closing.

12) Exhaust Air Temperature Detecting Circuit

This is a circuit for transmitting output change of thermistor (Exhaust thermistor) to I-1.

13) Magnetron Temperature Circuit.

(Detect Noload or Fan Lock) This is a circuit for transmitting output change of thermistor (Magnetron thermistor) to I-1.

2. Key Unit

The key unit is composed of a matrix circuit in which when a key it touched, one of signals P33 - P34 generated by the LSI, is passed through the key and returned to the LSI as one of signals P24 - P27. This model has 20 Memory pads. When the oven is shipped, Memory pad 1 to 10 are set as follows: fig.1.

Memory No. Cook Time Output Power

1 5 sec. 100% 2 10 sec. 100% 3 20 sec. 100% 4 30 sec. 100% 5 40 sec. 100% 6 50 sec. 100% 7 1 min. 100% 81 min. 15 sec. 100% 91 min.30 sec. 100% 02 mins. 100%

(fig. 1)

This model has a double quantity pad. When the oven is shipped, Magnification "1.8" is preset in the double quantity pad. This model has an defrost pad. When the oven is shipped, defrost is set as follows: fig.2.

1STAGE 2STAGE 3STAGE

POWER 40% 30% 20%

DEFROSTING TIME 0.2T+20sec 0.13T+30sec. 0.67T-50sec.

(fig. 2) NOTE : "CHECK" indicator will flash at half of defrosting time.

DESCRIPTION OF LSI

LSI(IXA222DR)

The I/O signal of the LSI(IXA222DR) is detailed in the following table.

Pin No. Signal I/O Description

1 VCC IN Power source voltage: GND.

VC voltage of power source circuit input. Connected to GND.

2 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -35V.

Vp voltage of power source circuit input.

3 AVSS IN Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)

4 VREF IN Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.

5-6 AN7-AN6 IN Terminal to switch the specification.

7 AN5 IN Temperature measurement input: EXHAUST THERMISTOR

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

8 AN4 IN Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal (0V). Door opened; "L" level signal (-5.0V).

9 AN3 - Terminal not used.

10 AN2 IN Temperature measurement input: MAGNETRON THERMISTOR TH2.

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

11 AN1 IN Temperature measurement input: MAGNETRON THERMISTOR TH1.

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

12 AN0 - Terminal not used.

13-14 P55-P54 - Terminal not used.

15 P53 OUT Magnetron (MG1) high-voltage circuit driving signal.

To turn on and off the cook relay. In 100% power level operation, "L" level during cooking; "H" level otherwise. In other power level operation (90, 80, 70, 60, 50, 40, 30, 20, 10 or 0%), "H" and "L" level is repeated according to power level.

R-22AT R-24AT

Power level ON OFF Power level ON OFF

100% 48sec. 0sec. 40% 22sec. 26sec. 90% 44sec. 4sec. 30% 16sec. 32sec. 80% 40sec. 8sec. 20% 12sec. 36sec. 70% 36sec. 12sec. 10% 8sec. 40sec. 60% 32sec. 16sec. 0% 0sec. 48sec. 50% 26sec. 22sec.

16 P52 - Terminal not used.

17 P51 OUT Magnetron (MG2) high-voltage circuit driving signal.

Power level ON OFF Power level ON OFF

100% 48sec. 0sec. 40% 22sec. 26sec. 90% 44sec. 4sec. 30% 16sec. 32sec. 80% 40sec. 8sec. 20% 12sec. 36sec. 70% 36sec. 12sec. 10% 8sec. 40sec. 60% 32sec. 16sec. 0% 0sec. 48sec. 50% 26sec. 22sec.

18 P50 - Terminal not used.

OFF

48 sec.

GND

-5V

GND

-5V

R-22AT R-24AT

Pin No. Signal I/O Description

1.2 sec

0.12 sec

1.2 sec

GND

-5V

2.4 sec

19 P47 OUT Signal to sound buzzer.

This signal is to control the 2.5kHz continuous signal. A: Switch touch sound.

B: Guidance sound. C: Completion sound.

200 sec.

20-21 P46-P45 - Terminal not used.

22 P44 OUT Oven lamp, Blower motor and Antenna motor driving signal (Square Waveform

: 50Hz).

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

During cooking

The Square waveform voltage is delivered to the RY1 relay driving circuit and relays (RY3, RY4, COOK RELAY) control circuit.

20 msec

23-24 P43-P42 - Terminal not used.

25 INT1 IN Signal synchronized with commercial power source frequency.

This is basic timing for all time processing of LSI.

OFF

GND

26 INT0 IN Connected to VC(-5) through pull-down resistor.

27 RESET IN Auto clear terminal.

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

28 P71 OUT Memory (EEPROM) clock output.

29 P70 IN/OUT Memory (EEPROM) data input/output.

30 XIN IN Internal clock oscillation frequency setting input.

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

31 XOUT OUT Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

32 VSS IN Power source voltage: -5V.

VC voltage of power source circuit input.

33 P27 IN Signal coming from touch key.

When either one of G-12 line keys on key matrix is touched, a corresponding signal out of P30 - P34 will be input into P27. When no key is touched, the signal is held at "L" level.

34 P26 IN Signal similar to P27.

When either one of G-11 line keys on key matrix is touched, a corresponding signal will be input into P26.

35 P25 IN Signal similar to P27.

When either one of G-10 line keys on key matrix is touched, a corresponding signal will be input into P25.

36 P24 IN Signal similar to P27.

When either one of G-9 line keys on key matrix is touched, a corresponding signal will be input into P24.

37-40 P23-P20 OUT Segment data signal.

The relation between signals and indicators are as follows:

Signal Segment Signal Segment Signal Segment

P01 ..................... k P21 ......................... h P15 ..................... d

P02 ...................... j P20 ......................... g P14 ...................... c

P03 ...................... i P17 ......................... f P13 ..................... b

P23 .................. LB P16 ......................... e P12 ..................... a

P22 .................. UB

20 msec.

-5V

Pin No. Signal I/O Description

41-46 P17-P12 OUT Segment data signal.

Signal similar to P23..

47-48 P11-P10 OUT Digit selection signal.

The relation between digit signal and digit are as follows: Digit signal Digit

P11 .................... 1st.

P10 ................... 2nd.

P07 .................... 3rd.

P06 .................... 4th.

P05 .................... 5th.

P04 .................... 6th.

§(50Hz)

P11

P10

P07

P06

GND

-31(V)

GND

-31(V)

R-22AT R-24AT

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

49-52 P07-P04 OUT Digit selection signal.

Signal similar to P11.

53-55 P03-P01 OUT Segment data signal.

Signal similar to P23.

56 P00 - Terminal not used.

57-58 P37-P36 OUT (Sound) Voltage level control terminal.

This terminal (P37) is to control volume level of buzzer sound with terminals P36. Since the volume level of buzzer sound depends on voltage energized, it is control level in 3 steps by combining signal levels for P37 and P36. Relationship of signal level combination to sound volume level is shown in the following table, 1~3 in the table, however, are indicated in the descending order from the maximum level of sound volume through the minimum level.

Sound Volume P36 P37

1, (Max.) L L 2, H L 3, (Min.) L H

*At Output terminal P47, rectangular wave signal of 2.5kHz is output.

59 P35 - Terminal not used.

60 P34 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24 - P27 terminal while one of G-4 line keys on key matrix is touched.

61 P33 OUT Key strobe signal.

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

62 P32 OUT Key strobe signal.

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

63 P31 OUT Key strobe signal.

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

64 P30 OUT Key strobe signal.

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

P05

P04

A : 1,(Max) 20V

2, 13V 3,(Min) 7V

GND

-31(V)

R-22AT R-24AT

2-2 Memory IC (I-2)

CAT24WC16PI is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2 are as shown in the following diagram.

TOP VIEW

VSS

VCC

TEST

SCL

SDA

Figure T-2. Relation between Pin Nos, and Signals

Pin No. Signal I/O Description

1-3 A0-A2 IN Connected to GND.

4 VSS IN Connected to VC(-5V). 5 SDA IN/OUT Serial data input/output : input/outputs data to I-1. 6 SCL IN Clock signal input : input/outputs serial data at every one pulse. 7 TEST IN Connected to VC(-5V). 8 VCC IN Connected to GND.

FUNCTIONAL DIAGRAM

(3) Vcc

(4) Vss

(5) SDA

(6) SCL

START

STOP

LOGIC

SLAVE ADDRESS

COMPARATOR

Dout ACK

XDEC

H.V. GENERATION

TIMING

& CONTROL

E PROM

512 x 8

YDEC

DATA REGISTER

Dout

START CYCLE

CONTROL

LOGIC

INC

LOAD

WORD ADDRESS COUNTER

R/W

SERVICING

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

KIA79L05P DTB143ES DTD143ES KRA101M

Transistor 2SB953

Transistor 2SB1238

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 supply 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. 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

R-22AT R-24AT

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).

4. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 60W (It is recommended to use a soldering iron with a grounding terminal.)

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

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

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

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

PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN

The following procedure enables the servicer to obtain the total service counts (cook cycles) for memory cooking, manual, repeat, double quantity cooking and defrost. The maximum capacity of the counter is 999,999 counts, above which the counter will reset to "0". The counter will retain the total counts (will not clear) in the event of a power disruption.

1) Practice for checking total service counts (eg; 234,567 Counts).

--- flashing / ---0.1sec. BUZZER

PAD DISPLAY INDICATOR LED PHONE

(door close) •

• CHECK NUMBER • CHECK CHECK #1 82 68 CHECK

(user total count) #2 VOLUME VOLUME DOUBLE 2 34 56 7 QUANTITY (service total count)

1 NUMBER 1

(after 1 sec.)

(filter used time)

2 NUMBER 2

(after 1 sec.)

2 00

(filter lim. time)

0 (No 10) NUMBER 10

(after 1 sec.)

35 43 2

(service total cook time)

CHECK •

#2: Denotes the procedure for the servicer to disable

checking/clearing. This procedure is instructed to service personnel only and is excluded from the operation manual.

2) Practice for clearing Service's counts

" " : Flicker / : 0.1 sec BUZZER

PAD ORDER DISPLAY PHONE

(Door close) •

CHECK "NUMBER" • CHECK CHECK 82 68 "CHECK"

(User's Total Counts)

#1 VOLUME 82 68 "CHECK"

VOLUME 82 68 "CHECK"

DOUBLE QUANTITY 2 34 56 7 "CHECK"

(Total Counts Service)

SET 0 "CHECK"

00 "CHECK"

SET 0 "CHECK"

CHECK •

#1: Denotes the procedure for the servicer to disable

clearing. This procedure is instructed to service personnel only and is excluded from the operation manual.

#1: Denotes total service counts within the reach of user,

of which checking and clearing practices are described in this instruction manual.

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PROCEDURE FOR ENTERING TO I-2

When the control unit or I-2 is exchanged, re-enter the constants of EXPRESS DEFROST, the memory information and the EEPROM data, referring to the following procedures.

If not so, the oven will not operate correctly.

1) How to enter the contents of EXPRESS DEFROST T = STG1 + STG2 + STG3

Constants STG = A x T + B of EXPRESS STG1 = 0.20 x T + 20 Power level 50% DEFROST STG2 = 0.13 x T + 30 Power level 30%

STG3 = 0.67 x T - 50 Power level 20%

Suppose above constants are entered.

" " : Flicker / : 0.1 sec BUZZER

PAD ORDER DISPLAY PHONE

(Door close) •

SET • SET "NUMBER" •

(within 2 sec.)

#1 START "NUMBER" • EXPRESS

DEFROST

2,0 1 0.20 DEF x 2

MANUAL/ 1 0 DEF

REPEAT #2 (+ - B)

21 20 DEF

POWER DEF "POWER"

LEVEL 1 20 100%

512050%

MANUAL/ 2 0.00 DEF

REPEAT

1, 3 2 0.13 DEF x 2

MANUAL/ 2 0 DEF

REPEAT

3230 DEF

POWER DEF "POWER"

LEVEL 2 30 100%

323030%

MANUAL/ 3 0 DEF

REPEAT

#3 5 3 5 DEF

POWER DEF "POWER"

LEVEL 3 5 100%

23520% SET 4 • DEF SET •

1 0.00 DEF

(A)

DEF POWER

(A)

(+ - B)

DEF POWER

#1: No key entry signal. #2: To set-B, touch the MANUAL/REPEAT key. #3: Ex. "CHECK" will flash and the oven will beep after

50% of EXPRESS DEFROST time has lapsed when 5 key is entered during actual cooking.

2) How to enter the memory information Example : Suppose cooking time 5 sec. and output power

100% are entered into the memory pad 1.

PAD ORDER DISPLAY PHONE

(Door close) •

SET • SET "NUMBER" •

(within 2 sec.)

1 NUMBER 1 •

MANUAL/ NUMBER 1 • 0

REPEAT

5 NUMBER 1 • 5

SET "NUMBER" • SET •

Enter the memory information into the memory pads 1 ~ 10 referring to above example. The memory information are given below.

Memory No. Cook Time Output Power

15 sec. 100% 2 10 sec. 100% 3 20 sec. 100% 4 30 sec. 100% 5 40 sec. 100% 6 50 sec. 100% 7 1 min. 100% 81 min.15 sec. 100% 91 min.30 sec. 100%

10 2 min. 100%

11-20 0 sec.

OTHER CHECKING AND CLEARING PROCEDURE FOR

1) To check the contents of EXPRESS DEFROST.

" " : Flicker / : 0.1 sec BUZZER

PAD ORDER DISPLAY PHONE

(Door close) •

CHECK "NUMBER" • CHECK

EXPRESS 1 0.20 DEF CHECK DEFROST (A)

DEF CHECK

1 20 POWER

(+ - B) 50%

2 0.13 DEF CHECK

(A)

DEF CHECK

2 30 POWER

(+ - B) 30%

DEF CHECK

3 5 POWER

20%

(Repeat)

CHECK •

#1: No key entry signal.

2) How to clear all counter(user and service) and total cooking time and used time of filter.

PAD ORDER DISPLAY PHONE

(Door close) •

SET • SET "NUMBER" •

DOUBLE "NUMBER" • DOUBLE

QUANTITY

CHECK "NUMBER" • DOUBLE

SIGNAL "NUMBER" • DOUBLE

SET •

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PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder

The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder. Example:

Sn-Ag-Cu

Indicates lead-free solder of tin, silver and copper.

2. Using lead-free wire solder

When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may result in cold soldered joints and damage to printed patterns.) As the melting point of lead-free solder is approximately 40˚C higher than tin/lead alloy solder, it is recommend that a dedicated bit is used, and that the iron temperature is adjusted accordingly.

3. Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (flow), to prevent damage to the land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time. Remove the bit as soon as a good flow is achieved. The high content of tin in lead free solder will cause premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is not required. Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their characteristics, making good soldering more difficult. It will be necessary to clean and replace bits more often when using lead-free solder. To reduce bit wear, care should be taken to clean the bit thoroughly after each use.

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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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

operating the oven.

1. Disconnect the oven from 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 grip the door handle and the door lever assembly 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:

1. Door does not close firmly.

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

3. The door gasket or seal is damaged.

4. The door is bent or warped.

5. There are defective parts in the door interlock system.

6. There are defective parts in the microwave generating and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

2. If the wave guide or oven cavity are not intact.

3. If the door is not closed.

4. If the outer case (cabinet) is not fitted.

WARNING FOR WIRING

To prevent an electric shock, take the following precautions.

1. Before wiring,

1) Disconnect the power supply cord.

2) Open the door and block it open.

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

2. Don’t let the wire leads touch to the followiong 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,

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

4. Insert the positive lock connector until its pin is locked

5. To prevent an error function, connect the wire leads

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) Blower fan blade, Blower fan motor, Switches, Switch levers, Antenna motors and Sirrer antennas.

and make sure that the wire leads do not come off even if the wire leads are pulled.

correctly, referring to the Pictorial Diagram.

OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL

To remove the components, procedure as follows.

1. Disconnect oven from power supply.

2. Open the oven door and wedge it open.

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

4. Slide the case back about 1 inch (3 cm) to free it from the oven cavity.

5. Lift entire case from the unit.

6. DISCHARGE TWO HIGH VOLTAGE CAPACITORS BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

7. Now, outer case is free.

N.B.; Step 1,2 and 9 form the basis of the 3D checks.

CAUTION:DISCHARGE TWO HIGH VOLTAGE CA-

PACITORS BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

HIGH VOLTAGE TRANSFORMER(S) REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the rear cabinet, too.

3. Disconnect wire lead(s) of high voltage transformer(s)

To remove rear cabinet and power supply cord:

8. Disconnect the power supply cord from the noise filter.

9. Remove the one (1) screws holding the grounding wire of power supply cord to the oven cavity.

10.Remove the screws holding the rear cabinet to the oven cavity and blower motor.

11.Remove the rear cabinet with the power supply cord from the oven cavity.

12.Loosen the tab of the cord bushing, and remove the power supply cord with the cord bushing from the rear cabinet.

13.Remove the cord bushing from the power supply cord,

14.Now, the power supply cord and rear cabinet are free.

from magnetron(s).

4. Remove the wire lead(s) of high voltage transformer(s) from the wire holder.

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5. Pull out the wire lead(s) of high voltage transformer(s) from the tube.

6. Disconnect wire lead(s) of high voltage transformer(s) from high voltage capacitor(s).

7. Disconnect the high voltage fuse(s) from high voltage transformer(s).

MAGNETRON(S) REMOVAL

Removal

1. CARRY OUT 3D CHECKS.

2. Remove the rear cabinet, too.

3. Remove the two (2) screws holding magnetron exhaust duct to upper and lower waveguide.

4. Remove the magnetron exhaust duct from oven cavity.

5. Disconnect wire leads from magnetron(s ).

6. Disconnect magnetron thermistor from the connector of the stop switch harness.

7. Remove the one (1) screw holding the thermistor angle to the upper magnetron.

8. Remove the four (4) screws holding each magnetron to

MAGNETRON THERMISTOR REPLACEMENT

8. Disconnect the main wire harness from high voltage transformer(s).

9. Remove two (2) screws holding each power transformer to base plate.

10.Remove the high voltage transformer(s) from base plate.

12.Now, high voltage transformer(s) are free.

upper and/or lower waveguide. When removing the screws, hold the magnetron to prevent it from falling.

9. Remove the magnetron(s) from upper and/or lower waveguide with care so magnetron antenna is not hit by any metal object around antenna.

10.Pull out the thermistor angle from the upper magnetron.

11.Now, the magnetron(s) is (are) free.

CAUTION: WHEN REPLACING MAGNETRON, BE

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

Removal

1. CARRY OUT

3D CHECKS.

2. Remove the rear cabinet, too.

Remove the magnetron from the waveguide flange, referring to "MAGNETRON(S) REMOVAL".

4. Now, the magnetron with the magnetron thermistor should be free.

5. Remove the thermistor angle from the magnetron by pulling out.

6. Straighten the tab of the magnetron thermistor angle holding the magnetron thermistor.

7. Remove the magnetron thermistor from the thermistor angle.

8. Now, the magnetron thermistor is free.

Re-install

1. Install the magnetron thermistor to the thermistor angle as shown in Figure C-1.

2. Hold the magnetron thermistor to the thermistor angle by bending the tab of the thermistor angle.

3. Insert the thermistor angle between the 2nd. fin and 3rd. fin from the upper fin of the magnetron and push it until the thermistor angle stops.

NOTE: The magnetron thermistor should be between the

upper fin and the 2nd. fin.

4. Re-install the magnetron to the waveguide flange with four (4) screws.

5. Re-install the thermistor angle to the waveguide flange with one (1) screw.

6. Re-install the magnetron exhaust duct to the upper and lower waveguide flanges with two (2) screws.

7. Route the thermistor harness under the magnetron temperature fuse.

8. Connect the thermistor harness to the stop switch harness.

9. Connect the wire leads to the upper magnetron, referring to the pictorial diagram.

10.Re-install the power supply cord, rear cabinet and outer case cabinet to the oven by reversing the procedures of "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

Upper magnetron

Upper fin

Thermistor angle

Magnetron thermistor

Tab

Figure C-1. Magnetron thermistor installation

HIGH VOLTAGE CAPACITOR, HIGH VOLTAGE FUSE AND HIGH VOLTAGE RECTIFIER

ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the rear cabinet, too.

3. Remove two (2) screws holding earth side terminals of high voltage rectifier assembly to the capacitor holder and oven cavity.

Disconnect all wire leads from the high voltage capacitor.

5. Disconnect high voltage fuse(s) from the high voltage transformer(s). Now, high voltage fuse(s) is(are) free.

Remove the three (3) screws holding the blower motor to the top of oven cavity, the chassis support and air duct.

7. Disconnect high voltage wire lead(s) of the high voltage rectifier assembly from the magnetron(s). Now, the the high voltage rectifier assembly is free.

8. Remove two (2) screws holding the capacitor holder to oven cavity. Now, the capacitors are free.

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CAUTION:

1. DISCHARGE THE TWO HIGH VOLTAGE CAPACITORS BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

2. DO NOT REPLACE ONLY THE HIGH VOLTAGE RECTIFIER. IF IT IS DEFECTIVE, REPLACE THE

BLOWER MOTOR REMOVAL

1. CARRY OUT

2. Remove the rear cabinet, too.

3. Disconnect the wire leads from the blower motor and noise filter.

4. Remove the one (1) screw holding the blower motor angle to the oven cavity.

3D CHECKS.

STIRRER MOTORS (UPPER AND LOWER) REMOVAL

UPPER

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the stirrer motor (upper).

3. Remove the one (1) screw holding the stirrer motor (upper) to the oven cavity.

4. Turn and lift up the stirrer motor (upper).

5. Now, the stirrer motor (upper) is free.

LOWER

1. Disconnect oven from the power supply.

2. Remove the stirrer motor cover by snipping off the

HIGH VOLTAGE RECTIFIER ASSEMBLY.

3. WHEN REPLACING THE HIGH VOLTAGE RECTIFIER ASSEMBLY AND THE HIGH VOLTAGE CAPACITOR, THE CATHODE (EARTH) SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A EARTHING SCREW.

5. Remove the one (1) screw holding the blower motor angle to the chassis support.

6. Remove the one (1) screw holding the air duct to the blower motor.

7. Remove the four (4) screws holding the blower motor angle to the blower motor.

8. Now, the blower motor is free.

material in four portions.

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

4. Disconnect the wire leads from the stirrer motor (lower).

5. Remove the one (1) screw holding the stirrer motor (Lower) to the oven cavity.

6. Now, the stirrer motor (lower) is free.

After replacement use one (1) screw (XOTWW40P08000) to fit the stirrer motor cover.

HOW TO RELEASE THE POSITIVE LOCK® CONNECTOR.

Procedure

1. CARRY OUT 3D CHECKS.

2. Pushing the lever of positive lock® connector, pull down the connector from the terminal.

3. Now, the connector is free.

CAUTION: WHEN CONNECTING THE POSITIVE

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

OVEN LAMP AND LAMP SOCKET REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the oven lamp.

3. 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.

4. Lift up the oven lamp socket .

5. Now, the oven lamp socket is free.

Terminal

Positive lock® connector

Lever

Push

Pull down

Figure C-2. How to release the positive lock connector.

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flat type small screw driver

Figure C-3. Oven lamp socket

TERMINAL INSULATOR REPLACEMENT

1. Open covers of the terminal insulator by using small flat type screw driver.

2. Remove the receptacle from the terminal insulator.

3. Now, the terminal insulator is free.

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Installation

1. Insert the receptacle into terminal insulator.

Terminal insulator

Flat type screw driver

CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

CONTROL PANEL ASSEMBLY REMOVAL

The complete control panel should be removed for replacement of components. To remove the control panel, proceed as follows:

1. Disconnect the oven from power supply.

2. Wait for 60 seconds to discharge the high voltage

capacitor.

3. Remove the air intake filter assembly from the base

plate.

4. Remove two (2) screws holding the control panel to the

base plate.

5. Pull down the control panel and remove it forward.

6. Disconnect connectors and wire leads from the control

unit.

7. Now the control panel assembly is free.

CAUTION FOR TOUCH CONTROL PANEL REMOVAL

1) Hold the lower end (Position A, Fig. 1) of the touch

control panel assembly firmly while sliding it down and toward you.

2) If the Touch Control Panel is hard to remove; (1) Insert a flat head screw driver into space B . (Fig. 1) (2) Rotate the screwdriver clockwise while holding posi-

tion C of the Touch Control Panel. (Fig. 2)

TO AVOID DAMAGE TO TOUCH CONTROL PANEL, COVER THE TIP OF SCREWDRIVER WITH TAPE.

Fig. 1

TOUCH CONTROL PANEL

SCREW DRIVER

Fig. 2

2. Close covers of the terminal insulator, as shown illustlated below.

COVERS

RECEPTACLE

Replacement of individual component is as follows:

CONTROL UNIT AND CONTROL PANEL FRAME (WITH KEY)

8. Remove three (3) screws holding the control panel mounting angle to the panel frame.

9. Lift up the control panel mounting angle from the panel frame.

10.Disconnect connector (G) from the control unit by pushing the hooks of cable holder inwardly.

11.Remove four (4) screws holding the control unit to the panel frame assembly.

12.Now, the control unit and control panel frame (with key) are free.

CAUTION: At installing control panel unit assembly to main body set:

1. Ensure the installation of wiring-related parts without negligence.

2. When inserting key cable to main body set, ensure them free from caught-in trouble. In addition, when installing the control panel assembly to base plate with screws, be sure of pushing the control panel unit upward to fix with screws firmly.

3. Do not allow any wire leads to come near the varistor works, because it will explode and the wire leads near by the varistor will be damaged.

HOW TO ATTACH MEMBRANE SWITCH AND GRAPHIC SHEET

1. Before attaching a new membrane switch and graphic sheet, remove remaining adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol.

2. Attach the graphic sheet to the membrane switch, with adjusting their upper edges and right edges. (This assembly part is called key unit in the following.)

NOTE : When attaching the graphic sheet, make sure

that air does not come between the membrane switch and the graphic sheet.

3. Then, adjust the upper edge and right edge of the key unit to the lower edge of the display window and the right flange of the control panel frame.

4. Stick the key unit firmly to the control panel frame by rubbing with soft cloth to prevent scratching.

POWER SUPPLY CORD REPLACEMENT

1. CARRY OUT 3D CHECKS

2. Release the cord bushing from the rear cabinet.

3. Disconnect the brown and blue wires of the power

supply cord from the noise filter.

4. Remove the single (1) screw holding the earth wire of power supply cord.

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5. Remove the power supply cord.

Re-install

1. Insert the power supply cord into the cord bushing.

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

3. Install the green/yellow wire of power supply cord with the one (1) screw.

4. Re-install the cord bushing to the rear cabinet.

5. CARRY OUT 4R CHECKS.

INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the control panel from the oven cavity referring to “CONTROL PANEL REMOVAL”.

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

4. Open the door and pull the latch hook out of the oven cavity.

5. For stop switch removal 5-1. Disconnect the wire leads from the switch. 5-2. Push the retaining tabs outward slightly and then

pull the switch forwards and remove it from the

Power supply cord

Cord bushing

Noise filter

Green/Yellow wire

Screw

Brown wire

Blue wire

Figure C-4. Power supply cord replacement

latch hook.

6. For interlock or monitor switches removal 6-1. Disconnect the wire leads from the interlock or

monitor switches.

6-2. Remove the single (1) screw and nut holding the

interlock or monitor switches to the latch hook.

CAUTION: IF THE LATCH HOOK IS NEW, WHEN

THE INTERLOCK SWITCHES OR MONITOR SWITCHES ARE INSTALLED, THE TWO (2) TABS OF THE LATCH HOOK SHOULD BE BROKEN.

INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT

In case interlock switches, stop switch and monitor switches do not operate properly due to a mis-adjustment, the following adjustment should be made.

1. Loosen the two (2) screws holding the latch hook.

2. With the door closed, adjust the latch hook by moving it back and forward, or up and down. In and out play of the door allowed by the latch hook should be less than

0.5mm. The vertical position of the latch hook should be placed where the stop switch and interlock switches have activated with the door closed. The horizontal position of the latch hook should be placed where the monitor switches have activated with the door closed.

3. Secure the screws with washers firmly.

4. Make sure of the interlock switches, stop switch, and monitor switches operation. If those switches have not activated with the door closed, loose two (2) screws holding latch hook and adjust the latch hook position.

After adjustment, make sure of the following:

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

2. The stop switch and interlock switches interrupt the circuit before the door open when the door release

lever is pulled, and then and monitor switch close the circuit when the door is opened.

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

Door release lever

Joint lever

Head lever

Latch head

Latch hook

SW4: Monitor switch

SW3: Monitor switch

SW2: Interlock switch

SW1: Interlock switch

SW5: Stop switch

Figure C-5 Latch Switch Adjustments

(Oven side)

DOOR REPLACEMENT AND ADJUSTMENT

REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the two (2) screws holding each of the upper and lower oven hinges to the oven cavity.

3. Remove door assembly with upper and lower oven hinges by pulling it forward.

4. Release upper and lower oven hinges from door assembly.

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5. Now, door assembly is free.

NOTE: When individual parts are replaced, refer to "Door

Disassembly".

RE-INSTALL

1. Insert the upper and lower oven hinges into door hinge pins.

2. Insert the upper and lower oven hinges with door assembly into rectangular holes of oven cavity front plate.

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

4. Fasten upper and lower oven hinges firmly to oven cavity with two (2) screws on each hinge.

Note: After any service to the door; (A) Make sure that interlock switches, stop switch

and monitor switches 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.

DOOR ADJUSTMENT

When removing and/or loosening hinges such as in door replacement, the following adjustment criteria are taken. Door adjustment is performed with the door properly installed and closed and while the oven hinges are loose.

1. Loosen upper and lower oven hinges with phillips head

screw driver.

2. Adjust the door by moving it vertically so that the top

right hand corner of the door is in line with the top of the control panel frame assembly.

3. Tighten the upper and lower oven hinge screws.

After adjustment, make sure of the following:

1. Door latch heads smoothly catch the latch hook through

the latch holes, and the latch head goes through the center of the latch hole.

2. Deviation of the door alignment from horizontal line of

cavity face plate is to be less than 1.0mm.

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

4. Re-install outer case and check for microwave leakage around 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. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.

UPPER OVEN HINGE

OUTER CASE CABINET

LOWER

LATCH HEADS

OVEN HINGE

Figure C-6. Door Replacement

DOOR DISASSEMBLY

CHOKE COVER REMOVAL

1. Open the door and insert a putty knife (thickness of about 0.5mm) in gap between the choke cover and corner portion of door panel to free engaging parts. Refer to Fig. C-7.

NOTE: As the choke cover and door panel are engage at

16 places, do not force any perticular part.

2. Remove the choke cover carefully. (If choke cover is broken, replace with a new one.)

DOOR HANDLE

PUTTY KNIFE

CHOKE COVER

UPPER OVEN HINGE

CHOKE COVER

BENT

LOWER OVEN HINGE

LATCH HEAD

Figure C-7. Choke cover

PUTTY KNIFE

BENT

DOOR PANEL

FRONT

DOOR COMPONENTS REMOVAL

UPPER AND LOWER OVEN HINGES REMOVAL

1. Remove the door assembly from oven cavity, referring to "REMOVAL" of "DOOR REPLACEMENT AND ADJUSTMENT".

2. Remove choke cover, referring to "CHOKE COVER REMOVAL".

3. Release the oven hinges from the door panel.

4. Now, the oven hinges are free.

DOOR HANDLE REMOVAL

1. Remove the door assembly from oven cavity, "REMOVAL" of "DOOR REPLACEMENT AND ADJUSTMENT".

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

3. Remove choke cover from door panel, referring to "CHOKE COVER REMOVAL".

4. Remove two (2) screws holding the door handle to door.

5. Remove the door handle from door panel.

6. Now, door handle is free.

R-22AT R-24AT

UPPER AND LOWER LATCH HEADS REMOVAL

7. Remove the door release lever from the door assembly.

8. Remove the three (3) screws holding the joint plate to the door panel.

9. Release the latch spring from the tab of the joint lever and joint plate.

10.Release the latch heads from joint lever and joint plate.

11.Now, the latch heads are free.

DOOR CASE REMOVAL

1. Remove the door assembly from oven cavity, referring to "REMOVAL" of "DOOR REPLACEMENT AND AD-

JUSTMENT".

2. Remove choke cover from door panel, referring to "CHOKE COVER REMOVAL".

3. Remove door handle from door panel, referring to "DOOR HANDLE REMOVAL".

4. Bend up four (4) nails of door case.

5. Remove door case from door panel.

6. Now, the door case is free.

DOOR GLASS REMOVAL

7. Remove the four (4) screws holding two (2) outside window fixing plates to door panel.

8. Now, the door glass is free.

SERVICE INFORMATION

IMPORTANT: When the magnetron MG1 and/or MG2 is replacing, the relays (RY3 and RY4) on control unit must

be replaced at the same time. Because if the magnetron's life has been over, the relay's life may also be over.

MICROWAVE MEASUREMENT

R-22AT R-24AT

After any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 60335-2-25 specifies that the maximum permitted leakage with a load of 275 ml is 50 W/m2 (equivalent to 5 mW/cm2 ) at a distance of 5 cm from the oven.

PREPARATION

The following items are required to carry out this test:-

1. A low form of 600 ml beaker made from an electrically

non-conductive material, such as glass or plastic, with an inside diameter of approximately 8.5 cm. This must contain 275 ± 15 ml of water, at an initial temperature of 20 ± 2˚C.

2. A leakage detector which has been calibrated within

the preceding 12 months to a stand whose accuracy can be traced to National Physical Laboratory Standards.

Recommended instruments are:

Apollo “XI” Celtec “A100”

Before commencing the test, check that the leakage detector is functioning and adjusted according to the manufacturer’s instructions, and any spacers are fitted to ensure that measurement is taken 5cm from the surface of the oven.

PROCEDURE

1. Place the beaker containing the water load in the oven cavity at the centre of the turntable. The placing of this standard load in the oven is important, not only to protect the oven, but also to ensure that any leakage it is not disguised by too large a load absorbing energy.

2. Close the oven door, and with the power level set to FULL, turn the oven ON with the timer set for a few minutes operation. Should the water begin to boil before the test has been completed, it should be replaced.

3. As shown in the diagram below, move the probe slowly (not faster than 2.5 cm/sec.);-

a) around the edge of the door following the gap b) across the face of the door c) across any vents in the oven’s sides, rear or top

Dotted line indicates the path taken by the leakage detector.

Whilst the maximum leakage permitted in BS EN 60335-2-25 is 50 W/m2 (equivalent to 5 mW/cm2), it is not normal to detect

any significant leakage, and therefore any detected leakage should be investigated.

R-22AT R-24AT

NOTE: CONDITION OF OVEN

SCHEMATIC

1. POWER SUPPLY CONNECTED AND/OR 1MINUTE AFTER DOOR CLOSED OR COOK OFF.

2. . APPEAR ON DISPLAY.

NOISE FILTER

BRN

230 - 240V~50Hz

NEUTRAL LIVE

F3 : WEAK POINT A017

EARTH

BLU

GRN/YLW

NOISE SUPPRESSION COIL

DISCHARGE RESISTOR 680 kΩ 1/2W

LINE CROSS CAPACITOR 0.22µF/ AC250V

10000 pF/ AC250V

LINE BYPASS CAPACITOR

DISCHARGE RESISTOR 10 MΩ 1/2W

10000 pF/ AC250V

LINE BYPASS CAPACITOR

T3:

TOUCH CONTROL

TRANSFORMER

CN-A

TF3: EXHAUST

TEMP. FUSE

120°C

NOTE: Indicates components with potential above 250 V.

TF1: TEMP. FUSE 150°C (Upper Mag.)

TF1: TEMP. FUSE 150°C

FUSE

2.5A

CONTROL

UNIT

RY1

CN-A

OVEN LAMP

RY4:

COOK RELAY

RY3:

ANTENNA

MOTOR

6 5 4

SW5:

STOP

SWITCH

COOK RELAY

TH3: EXHAUST THERMISTOR

TH1:

MAGNETRON THERMISTOR (Upper)

BLOWER

SW2: INTERLOCK SWITCH

MOTOR

SW1: INTERLOCK SWITCH

(Lower Mag.)

SW3:

MONITOR

SWITCH

SW4: MONITOR SWITCH

TH2: MAGNETRON THERMISTOR (Lower)

F1: FUSE F10A

F2: FUSE F10A

T1: HIGH VOLTAGE

TRANSFORMER

T2: HIGH VOLTAGE

TRANSFORMER

(Front)

(Rear)

F4: H.V.FUSE

0.80 A

F5: H.V.FUSE

0.80 A

C1: H.V. CAPACITOR

0.94µF/ AC2300V

C2: H.V. CAPACITOR

0.94µF/ AC2300V

MG1: MAGNETRON (Upper)

H. V. RECTIFIER

MG2: MAGNETRON (Lower)

H. V. RECTIFIER

NOTE: CONDITION OF OVEN

SCHEMATIC

1. FOR 1MINUTE AFTER DOOR CLOSED.

2. . APPEAR ON DISPLAY.

NOISE FILTER

BRN

230 - 240V~50Hz

BLU

NEUTRAL LIVE

NOISE SUPPRESSION COIL

F3 : WEAK POINT A017

EARTH

GRN/YLW

DISCHARGE RESISTOR 10 MΩ 1/2W

DISCHARGE RESISTOR 680 kΩ 1/2W

LINE CROSS CAPACITOR 0.22µF/ AC250V

Figure O-1 Oven Schematic-OFF Condition

T3:

TOUCH CONTROL

10000 pF/ AC250V

LINE BYPASS CAPACITOR

CN-A

10000 pF/ AC250V

LINE BYPASS CAPACITOR

NOTE: Indicates components with potential above 250 V.

TF1: TEMP. FUSE 150°C (Upper Mag.)

TF1: TEMP. FUSE 150°C (Lower Mag.)

SW3:

MONITOR

SWITCH

SW4: MONITOR SWITCH

TH2: MAGNETRON THERMISTOR (Lower)

F1: FUSE F10A

F2: FUSE F10A

FUSE

TRANSFORMER

CONTROL

RY1

CN-A

TF3: EXHAUST

TEMP. FUSE

120°C

2.5A

UNIT

OVEN LAMP

RY4:

COOK RELAY

RY3:

ANTENNA

MOTOR

6 5 4

SW5:

STOP

SWITCH

COOK RELAY

TH3: EXHAUST THERMISTOR

TH1:

MAGNETRON THERMISTOR (Upper)

SW2: INTERLOCK SWITCH

(Front)

C1: H.V. CAPACITOR

T1: HIGH VOLTAGE

T2: HIGH VOLTAGE

0.94µF/ AC2300V

TRANSFORMER

F4: H.V.FUSE

0.80 A

(Rear)

C2: H.V. CAPACITOR

0.94µF/ AC2300V

TRANSFORMER

F5: H.V.FUSE

0.80 A

MG1: MAGNETRON (Upper)

H. V. RECTIFIER

MG2: MAGNETRON (Lower)

H. V. RECTIFIER

SW1: INTERLOCK SWITCH

Figure O-2 Oven Schematic-IDLE Condition (Door opened condition)

R-22AT R-24AT

NOTE: CONDITION OF OVEN

SCHEMATIC

1. DOOR CLOSED.

2. MANUAL REPEAT KEY TOUCHED.

3. COOKING TIME PROGREMMED.

4. START PAD TOUCHED.

NOISE FILTER

BRN

230 - 240V~50Hz

BLU

NEUTRAL LIVE

NOISE SUPPRESSION COIL

F3 : WEAK POINT A017

EARTH

GRN/YLW

DISCHARGE RESISTOR 10 MΩ 1/2W

DISCHARGE RESISTOR 680 kΩ 1/2W

LINE CROSS CAPACITOR 0.22µF/ AC250V

T3:

TOUCH CONTROL

TRANSFORMER

10000 pF/ AC250V

LINE BYPASS CAPACITOR

CN-A

10000 pF/ AC250V

LINE BYPASS CAPACITOR

FUSE

CONTROL

RY1

CN-A

TF3: EXHAUST

TEMP. FUSE

120°C

2.5A

UNIT

OVEN LAMP

RY4:

COOK RELAY

RY3:

COOK RELAY

ANTENNA

MOTOR

6 5 4

SW5:

STOP

SWITCH

TH3: EXHAUST THERMISTOR

TH1:

MAGNETRON THERMISTOR (Upper)

SW2: INTERLOCK SWITCH

TF1: TEMP. FUSE 150°C (Upper Mag.)

TF1: TEMP. FUSE 150°C (Lower Mag.)

SW3:

MONITOR

SWITCH

SW4: MONITOR SWITCH

TH2: MAGNETRON THERMISTOR (Lower)

F1: FUSE F10A

F2: FUSE F10A

(Front)

C1: H.V. CAPACITOR

T1: HIGH VOLTAGE

T2: HIGH VOLTAGE

0.94µF/ AC2300V

TRANSFORMER

F4: H.V.FUSE

0.80 A

(Rear)

C2: H.V. CAPACITOR

0.94µF/ AC2300V

TRANSFORMER

F5: H.V.FUSE

0.80 A

MG1: MAGNETRON (Upper)

H. V. RECTIFIER

MG2: MAGNETRON (Lower)

H. V. RECTIFIER

SW1: INTERLOCK SWITCH

Figure O-3 Oven Schematic-Cooking Condition

R-22AT

BRN

NOISE FILTER

BLU

SW5 : STOP

SWITCH

TOUCH CONTROL PANEL

CN-C

6 GRN

1 ORG

COM.

BLU

GRN

ORG

WHT

COM.

SW1: INTERLOCK

SWITCH

(Cabinet side)

COM.

BRN

BLU

HIGH VOLTAGE COMPONENTS

MG1 :

MAGNETRON

(Upper)

White case

Black tape

MG2 :

MAGNETRON

(Lower)

T1 :

HIGH VOLTAGE

TRANSFORMER

F4: H.V. FUSE

F5: H.V. FUSE

H. V. RECTIFIER

C2 : HIGH VOLTAGE

CAPACITOR

BLK

WHT

OL : OVEN LAMP

& SOCKET

CONNECTOR

TH3:

EXHAUST

THERMISTOR

G/Y

POWER

SUPPLY

CORD

EARTH

NEUTRAL

LIVE

BLK

WHT

SW3 :

MONITOR

SWITCH

(Cabinet side)

CN-A

CN-B

1 BLK

5 YLW

3 RED

5 BLK

1 GRN

3 GRY

2 RED

BM :BLOWER

MOTOR

CN-B

GRN

BLU

COM.

BRN

BLU

SW4 :

MONITOR

SWITCH

(Oven side)

BLU

RED

BRN

WHT

SW2: INTERLOCK

SWITCH

(Oven side)

YLW

WHT

ORG

BLU

SM:

ANTENNA

MOTOR

(Upper)

BLK

RED

WHT

BLK

T2 :

HIGH VOLTAGE

TRANSFORMER

C1 : HIGH VOLTAGE

CAPACITOR

H. V. RECTIFIER

TH1:

MAGNETRON

THERMISTOR (Upper)

TH2:

MAGNETRON

THERMISTOR (Lower)

BLK

WHT

BLK

F1 : FUSE F10A

(Cabinet side)

(Blue case) (Blue case)

(Blue case)

BLU

F2 : FUSE F10A

(Oven side)

Blue

case

TF1: TEMP. FUSE 150˚C

(Upper MAG.)

TF3: EXHAUST TEMP.

FUSE 120˚C

BRN

BLK

TF2: TEMP. FUSE 150˚C

(Lower MAG.)

BRN

BLK

RED

GRN

GRY

GRN

WHT

GRN

RED

SM:

ANTENNA

MOTOR

(Lower)

TOUCH CONTROL

TRANSFORMER

CN-D

RY1

112

RY4

F1: FUSE 2.5A

ORG

RED

YLW

WHT

BLU

BRN

BLK

WHT

A017

WHT

RY3

CN-C

CN-G

I-1

I-2

BRN

R-24AT

2345 6

Figure S-1. Pictrorial Diagram

123456

R-22AT

565758

P45

P44

P43

P42

INT1

INT0

RESET

P71

P70

XIN

XOUT

VSS

P30

P31

P32

P33

P34

P35

P36

P37

P00

P01

P02

P03

P04

P05

P06

P07

P10

P11

P12

P13

COM

VSS

VCC

TEST

SCL

SDA

I-2

D1D2

D3 D4

RY3

RY1

CN-A

C30

R33

R31

10K

2G 3G 4G 5G

6G i j

f e

AC2

AC1

P27

P26

P25

P24

P23

P22

P21

P20

P17

P16

P15

P46

P47

P50

P51

P52

P53

P54

P55

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

VREF

AVSS

VEE

P14

G10

G11

G12

R95

R96

R97

R98

4.7 K

R94

R92

R90

R91

4.7 K

10EDB10

50V/0.1uF

50V/2200uF

1.5 K

Q11

2SB953

ZD1

HZ16-1

16V/100uF

50V/10uF

C10

ZD2

HZ4C3

KRA101M

10K

10EDB10

C74

50V/10uF

270/1W

6.2 1/2W

R21

56K

C21

KRA101M

Q20

Q80 C80

D81

C81

Q81

COM

RY4

D83

D84

10EDB10

D70

D71

100

R70

R71

4.7 K

C70

1.8K

4.7K 10K

3.9K

15K

R67

G1 G2 G3 G4 G5 G6 G7 G8

CF1

C98

C99

C100

C101

330Px4

50V/

0.1u F

150

50V/0.1uF

R41 20K

Q40

KRA101M

Q41

2SB1238

R42

R43

39K

10K

C31

R30

100

DTB143ES

Q86

Q87

R65

R64

4.7K x3

C60

C62

C63

R60

R62:

R63:

33K

CN-C

CN-G Key Unit

4.7 K

CN-B

CN-D

DU24D1-1PR(M)

4 3

50V/0.1uF

I-1

23 24 25

BLACK

R22

4.7K

C22

C75

CAT24WC16PI

Door

IXA222DR

:IF NOT SPECIFIED 0.01uF/16V

:IF NOT SPECIFIED 1/4W ±5%

RED

Oven

MG.

TH2

MG.

TH1

* I-1

P00 - P23 PULL DOWN

P24 - P27 PULL DOWN

CST4.00MGW

4.7K

50V/10uF

VCC

DEF CHECK

POWER

DOUBLEON

NUMBER

FILTER

DG1

A053DR

FLUORESCENT DISPLAY TUBE

R40

3.3K

R93

R32

2.7K

10EDB10

KIA79L05P

D1 - D4: 10EDB10

50V/0.1uF

DTD143ES

50V/10uF

KRA101M

VRS1

470V

FTR-F3AA024E

2.5A

RTRNPA005WRZZ

DU24D1-1PR(M)

DTB143ES

aa a a

:IF NOT SPECIFIED 1SS133

2.7K (R22AT)

1.8K (R24AT)

2.7K (R22AT)

1.8K (R24AT)

R-24AT

2345 6

Figure S-2. Control Panel Circuit

123456

R-22AT R-24AT

2345 6

RED

BLACK

2.5A

FUSE

Figure S-3. Printed Wiring Board

123456

PAR TS 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

ELECTORIC PARTS

1- 1 FACCBA013WRKZ Power supply cord 1 AR 1- 2 QSOCLA024WRE0 Oven lamp socket 1 AH 1- 3 FW-QZA117WRK0 High voltage rectifier assembly 1 AU

1- 4 FPWBFA335WRE0 Noise filter 1 AX 1- 5 QFSHDA019WRE0 Fuse holder 2 AH 1- 6 FMOTEA482WRKZ Blower motor 1 BH 1- 7 RC-QZA264WRE0 High voltage capacitor 2 BA

1- 8 QFS-CA026WRZZ Fuse F10A 2 AH 1- 9 QFS-CA017WRE0 Weak point A017 1 AF 1-10 QFS-IA010WRZZ High voltage fuse 0.80A 2 AQ

1-11 RV-MZA335WRZZ Magnetron 2 BA

∆

1-12 RLMPTA028WRE0 Oven lamp 1 AK 1-13 RMOTDA238WRZZ Antenna motor 2 AR 1-14 QSW-MA085WRE0 Interlock switch 2 AF 1-15 QSW-MA086WRE0 Monitor switch 2 AF 1-16 QSW-MA085WRE0 Stop switch 1 AF 1-17 RTRN-A742WRZZ High voltage transformer [R-22AT] 2 BK

1-17 RTRN-A741WRZZ High voltage transformer [R-24AT] 2 BL

1-18 RTRNPA005WRZZ Touch control transformer 1 AQ 1-19 QFS-TA014WRE0 Temperature fuse 150C 2 AG 1-20 QFS-TA015WRE0 Temperature fuse 120C (Exhaust) 1 AG 1-21 FH-HZA070WRE0 Magnetron thermistor 2 AM 1-22 FH-HZA070WRE0 Exhaust thermistor 1 AM

CABINET PARTS

2- 1 FDAI-A275WRTZ Base plate 1 BC 2- 2 GCABUA860WRPZ Outer case cabinet 1 BD 2- 3 GCOVAA283WRW0 Rear cabinet 1 AX 2- 4 FFTASA064WRY0 Oven lamp access cover assembly 1 AN 2- 4-1 PCUSUA585WRPZ Cushion 1 AF 2- 4-2 PREFHA059WRP0 Reflector 1 AF 2- 5 FFPF-A016WRK0 Vibration-proof sheet 1 AU 2- 6 PSHEGA007WRE0 Rubber sheet B 2 AE

CONTROL PANEL PARTS

3- 1 DPWBFC483WRKZ Control unit [R-22AT] 1 BN 3- 1 DPWBFC488WRKZ Control unit [R-24AT] 1 BN 3- 1A QCNCMA314DRE0 5-pin connector (CN-A) 1 AC 3- 1B QCNCMA413DRE0 6-pin connector (CN-B) 1 AC 3- 1C QCNCMA420DRE0 5-pin connector (CN-C) 1 AK 3- 1D QCNCMA493DRZZ 6-pin connector (CN-D) 1 AE 3- 1E QCNCWA057DRE0 12-pin connector (CN-G) 1 AF 3- 1F RV-KXA053DRE0 Fluorescent display tube 1 AW 3- 1G PCUSGA359WRP0 Cushion 2 AC BZ RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG C1 VCKYD11HF104Z Capacitor 0.1uF 50V 1 AB C2 VCEAG51HW228M Capacitor 2200uF 50V 1 AH C3 VCEAG31HW106M Capacitor 10uF 50V 1 AB C4 VCKYD11HF104Z Capacitor 0.1uF 50V 1 AB C5 VCEAG31HW106M Capacitor 10uF 50V 1 AB C6-7 VCKYD11CY103N Capacitor 0.01uF 16V 2 AA C8 VCEAG31CW107M Capacitor 100uF 16V 1 AC C9 VCEAG31HW106M Capacitor 10uF 50V 1 AB C10 VCKYD11HF104Z Capacitor 0.1uF 50V 1 AB C21 VCKYD11HF104Z Capacitor 0.1uF 50V 1 AB C22 VCKYD11CY103N Capacitor 0.01uF 16V 1 AA C30 VCKYD11CY103N Capacitor 0.01uF 16V 1 AA C31 VCEAG31HW106M Capacitor 10uF 50V 1 AB C60 VCKYD11CY103N Capacitor 0.01uF 16V 1 AA C62-63 VRD-B12EF333J Resistor 33k ohm 1/4W 2 AA C70 VCKYD11CY103N Capacitor 0.01uF 16V 1 AA C74 VCKYD11HF104Z Capacitor 0.1uF 50V 1 AB C75 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA C80 VCKYD11HF104Z Capacitor 0.1uF 50V 1 AB C81 VCEAG31HW106M Capacitor 10uF 50V 1 AB C98-101 VCKYD11HB331K Capacitor 330pF 50V 4 AA CF1 RCRS-A010DRE0 Ceramic resonator (CST4.00MGW) 1 AD D1-7 VHD10EDB10+-1T Diode (10EDB10) 7 AB D70 VHD10EDB10+-1T Diode (10EDB10) 1 AB D71 VHD1SS133//-2 Diode (1SS133) 1 AA D81 VHD1SS133//-2 Diode (1SS133) 1 AA D83-84 VHD1SS133//-2 Diode (1SS133) 2 AA

R-22AT R-24AT

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

F1 QFS-IA001KKZZ Fuse 2.5A 50V 1 AD I- 1 RH-IXA222DRZZ LSI 1 AU I- 2 RH-IXA298DRZZ EEPROM 1 AK Q2 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q3 VHIKIA79L05-3 Transistor (KIA79L05P) 1 AE Q11 VS2SB953-PQ-4 Transistor (2SB953) 1 AG Q20 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q40 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q41 VS2SB1238//-3 Transistor (2SB1238) 1 AA Q80 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q81 VSDTD143ES/-3 Transistor (DTD143ES) 1 AC Q86-87 VSDTB143ES/-3 Transistor (DTB143) 2 AC R1 VRD-B12EF152J Resistor 1.5k ohm 1/4W 1 AA R2 VRS-B13AA271J Resistor 270 ohm 1W 1 AA R3 VRS-B13AA151J Resistor 150 ohm 1W 1 AA R5 VRD-B12EF103J Resistor 10k ohm 1/4W 1 AA R6 VRD-B12HF6R2J Resistor 6.2 ohm 1/2W 1 AA R21 VRD-B12EF563J Resistor 56k ohm 1/4W 1 AA R22 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R30 VRD-B12EF101J Resistor 100 ohm 1/4W 1 AA R31 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA R32 VRD-B12EF272J Resistor 2.7k ohm 1/4W 1 AA R33 VRD-B12EF103J Resistor 10k ohm 1/4W 1 AA R40 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA R41 VRD-B12EF203J Resistor 20k ohm 1/4W 1 AA R42 VRD-B12EF393J Resistor 39k ohm 1/4W 1 AA R43 VRD-B12EF103J Resistor 10k ohm 1/4W 1 AA R60 VRD-B12EF333J Resistor 33k ohm 1/4W 1 AA R62-63 VRD-B12EF272J Resistor 2.7k ohm 1/4W [R-22AT] 2 AA R62-63 VRD-B12EF182J Resistor 1.8k ohm 1/4W [R-24AT] 2 AA R64-65 VRD-B12EF472J Resistor 4.7k ohm 1/4W 2 AA R67 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R70 VRD-B12EF101J Resistor 100 ohm 1/4W 1 AA R71 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R90-98 VRD-B12EF472J Resistor 4.7k ohm 1/4W 9 AA J1 VRD-B12EF182J Resistor 1.8k ohm 1/4W 1 AA J2 VRD-B12EF392J Resistor 3.9k ohm 1/4W 1 AA J3 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA J4 VRD-B12EF103J Resistor 10k ohm 1/4W 1 AA RY1 RRLY-B004MRE0 Relay (FTR-F3AA024E) 1 AF RY3-4 RRLY-A113DRE0 Relay (DU24D1-1PR(M)) 2 AM VRS1 VHV10V471K+-1 Varistor (TNR10V471K) 1 AD ZD1 VHEHZ161///-1 Zener diode (HZ16-1) 1 AA ZD2 VHEHZ4C3///-1 Zener diode (HZ4C3) 1 AA 3- 2 FPNLCB469WRK0 Control panel frame with key unit assembly 1 BA 3- 2-1 PSHEPB154WREZ Graphic sheet 1 3- 2-2 QSW-KA041DRZZ Membrane switch 1 AV 3- 2-3 HDECAA195WRP0 Decoration metal fittings 1 AP 3- 2-4 PCUSUA417WRP0 Cushion 1 AB 3- 2-5 PCUSGA618WREZ Cushion 1 AD 3- 3 LANGTA243WRW0 Control panel mounting angle 1 AF 3- 4 XEPS730P10XS0 Screw : 3mm x 10mm 4 AA 3- 5 XEPS740P12000 Screw : 4mm x 12mm 2 AA 3- 6 LX-BZA138WREZ Special screw 1 AB

OVEN PARTS

4- 1 PCLICA042WREZ Chassis clip 4 AC 4- 2 FDUC-A345WRY0 Exhaust duct assembly 1 AP 4- 3 FOVN-A444WRY0 Oven cavity 1 BS

∆

4- 4 PFILWA053WRP0 Oven light screen (Inside) 1 AE 4- 5 MLEVPA153WRF0 Switch lever A 1 AC 4- 6 MLEVPA154WRF0 Switch lever B 1 AC 4- 7 MLEVPA155WRF0 Switch lever C 1 AC 4- 8 MSPRCA075WRE0 Switch spring A 1 AB 4- 9 MSPRCA076WRE0 Switch spring B 2 AB 4-10 PHOK-A081WRF0 Latch hook 1 AP

∆

4-11 MHNG-A216WRM0 Lower oven hinge 1 AG

∆

4-12 PCUSUA268WRP0 Cushion 1 AA 4-13 PCUSU0407WRP0 Cushion 2 AA 4-14 FGLSPA063WRY0 Ceramic shelf 1 BF 4-15 FPLT-A008WRY0 Stirrer antenna upper assembly 1 AV 4-16 FPLT-A009WRY0 Stirrer antenna lower assembly 1 AV 4-17 PCUSUA538WRPZ Cushion 1 AD 4-18 LANGQA370WRP0 Oven lamp mounting plate 1 AD 4-19 LBNDKA068WRP0 Capacitor holder 1 AD 4-20 PGIDHA054WRW0 Water-proof cover 1 AF 4-21 NSFTPA031WRF0 Antenna motor shaft 2 AH 4-22 PZETEA087WRPZ Insulater 1 AE 4-23 PCUSUA417WRP0 Cushion 1 AB

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

4-24 MHNG-A215WRM0 Upper oven hinge 1 AG

∆

4-25 PCUSUA413WRP0 Cushion 1 AG 4-26 PCUSUA415WRP0 Cushion 1 AC 4-27 PDUC-A729WRF0 Air duct 1 AL 4-28 PDUC-A564WRW0 Mg exhaust duct 1 AP 4-29 PCUSUA414WRP0 Cushion 1 AD 4-30 LANGKA679WRPZ Fixing angle S 1 AD 4-31 HDECQA147WRM0 Corner cap right 1 AE 4-32 LANGFA195WRW0 Chassis support 1 AH 4-33 LBSHC0006YBE0 Cord bushing 1 AD 4-34 PCOVPA363WRFZ Stirrer cover 1 BA 4-35 FFIL-A003WRK0 Air intake filter assembly 1 AV 4-36 HDECEA001WRP0 Decoration sash 1 AR 4-37 HDECQA146WRM0 Corner cap left 1 AE 4-38 PCUSGA409WRP0 Cushion 2 AE 4-39 LANGQA440WRM0 Earth angle 1 AE 4-40 LANGQA512WRP0 Thermistor angle 2 AE 4-41 LANGQA593WRPZ Blower motor angle 1 AH 4-42 MSPRCA101WRE0 Switch lever spring C 1 AC

DOOR PARTS

5 CDORFA996WRKZ Door assembly 1 BV

∆

5- 1 DDORFB101WRKZ Door panel assembly 1 BM

∆

5- 2 GCOVAA242WRY0 Door case 1 BD 5- 3 FHNDMA011WRY0 Door lever assembly 1 AP 5- 4 GCOVHA350WRF0 Choke cover 1 AR

∆

5- 5 JHNDMA039WRM0 Door handle 1 AX 5- 6 LANGKA766WRP0 Outside window fixing plate 2 AF 5- 7 PCUSGA430WRP0 Cushion 2 AM 5- 8 PGLSPA457WRE0 Door glass 1 AV 5- 9 PPACGA142WRP0 Door case packing 2 AF 5-10 PSPA-A102WRE0 Door case spacer 2 AE 5-11 PGID-0024WRF0 Handle guide 4 AC 5-12 PCUSGA486WRP0 Cushion 1 AM 5-13 XHTS740P08RV0 Screw : 4mm x 8mm 9 AG 5-14 FANGKA200WRY0 Latch fixing angle 1 AQ 5-15 FLEVFA019WRY0 Joint lever 1 AP 5-16 LSTPCA002WRM0 Latch head 2 AM

∆

5-17 MLEVPA220WRF0 Head lever 1 AM 5-18 MSPRCA097WRE0 Latch spring 1 AG 5-19 HBDGCA094WRE0 Door badge [R-22AT] 1 AF 5-19 HBDGCA091WRE0 Door badge [R-24AT] 1 AF 5-20 PGID-0025WRF0 Handel spacer 1 AC

MISCELLANEOUS

6- 1 TINSEB094WRRZ Operation manual 1 AH 6- 2 TLABHA029WRR0 Menu sticker 1 AC 6- 3 FW-VZB999WREZ Switch harness 1 AP 6- 4 FW-VZC001WREZ Main wire harness 1 BC 6- 5 LHLDWA040WRE0 Wire holder A 1 AB 6- 6 LBNDKA079WRE0 Wire holder 2 AB 6- 7 TCAUH0057YBR0 Lamp caution 1 AD 6- 8 TCAUHA257WRR0 S caution sheet 1 AE 6- 9 PZET-A018WRE0 Terminal insulator 2 AC 6-10 TLABSA064WRR0 A017 label 1 AC 6-11 TLABSA055WRR0 Fuse label F10A 2 AE 6-12 TCAUH0114WRR0 Caution label 1 AC 6-13 LHLDWQ004YBE0 Purse lock L 2 AA 6-14 TCAUAA205WRR0 Cord caution 1 AE

SCRE,NUTS AND WASHERS

7- 1 LX-BZA169WREZ Special screw 4 AC 7- 2 LX-BZA138WREZ Special screw 13 AB 7- 3 LX-BZA139WREZ Special screw 1 AA 7- 4 LX-CZA095WREZ Special screw 3 AB 7- 5 LX-BZA164WREZ Special screw 12 AC 7- 6 XOTWW40P08000 Screw : 4mm x 8mm 28 AB 7- 7 LX-BZA116WRE0 Special screw 2 AD 7- 8 LX-BZA152WREZ Special screw 1 AB 7- 9 XOTS740P08000 Screw : 4mm x 8mm 4 AA 7-10 LX-BZA132WREZ Special screw 4 AB 7-11 LX-EZA004WRE0 Special screw 2 AA 7-12 LX-BZA041WRE0 Special screw 2 AA 7-13 XJPS740P10000 Screw : 4mm x 10mm 2 AA 7-14 XCBWW30P08000 Screw : 3mm x 8mm 2 AA 7-15 XOTS740P10RV0 Screw : 4mm x 10mm 3 AB 7-16 XNES730-24000 Nut : 3mm x 2.4mm 2 AE 7-17 LX-WZA035WRE0 Special washer 1 AB

R-22AT R-24AT

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

7-18 XWSS740-10000 Washer: 4mm x 1mm 1 AA 7-19 XFTS740P12000 Screw : 4mm x 12mm 1 7-20 LX-BZA150WREZ Special screw 1 AB 7-21 XCHWW40P08000 Screw : 4mm x 8mm 2 AB 7-22 XCPS730P10000 Screw : 3mm x 10mm 2 AA 7-23 XBPS730P28KS0 Screw : 3mm x 28mm 2 AB

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 SPADPA552WRE0

DOOR PAD SPADF0341WRE0

TRAY SUPPORT SPADPA551WRE0

OPERATION MANUAL S CAUTION SHEET MENU LABEL

TOP PAD ASSEMBLY FPADBA313WRK0

BOTTOM PAD ASSEMBLY FPADBA314WRK0

PACKING CASE SPAKCD321WRE0 [R-22AT] SPAKCD327WRE0 [R-24AT]

* Not replaceable items.

R-22AT R-24AT

2345 6

OVEN AND CABINET PARTS

7-6

7-5

7-13

7-6

7-2

4-20

4-23

4-30

2-3

7-6

7-21

7-3

7-6

6-12

4-33

1-1

7-6

7-4

7-18

7-6

7-2

7-6

7-17

4-39

7-6

4-29

1-19

7-5

7-2

4-25

1-1

4-27

7-6

4-13

4-28

7-6

7-15

7-12

4-40

1-21

1-7

7-5

4-40

1-7

1-21

4-19

7-2

1-3

7-2

7-6

1-11

1-8

7-22

1-5

4-13

4-32

7-15

6-7

2-4

2-2

2-4-1

7-6

2-4-2

7-6

6-6

7-6

2-5

7-14

1-20

4-12

1-22

4-26

4-2

1-13

4-38

7-6

7-1

1-2

7-13

1-12

4-18

7-2

4-21

7-8

4-37

4-24

4-3

4-4

7-1

4-11

1-19

4-15

6-14

7-19

7-9

6-6

4-22

1-4

6-11

7-2

1-9

6-10

4-36

7-10

4-21

1-13

7-2

1-17

7-2

4-31

7-11

7-16

7-5

7-2

4-9

1-10

4-8

1-10

1-15

4-5

4-42

1-15

4-6

7-9

7-23

4-41

1-14

4-16

7-20

1-18

7-7

4-34

2-1

6-5

1-17

4-10

4-9

4-17

4-7

1-16

2-6

4-1

7-6

7-2

7-6

4-1

2-6

7-4

4-1

4-35

7-4

4-1

4-14

7-23

1-14

1-6

123456

R-22AT R-24AT

2345 6

CONTROL PANEL PARTS

3-2

3-2-4

3-1

3-2-2

3-4

3-2-3

3-2-5

3-5

DOOR PARTS

3-6

3-3

5-10

3-2-1

5-13

5-11

5-5

5-12

5-19

5-20

5-11

5-8

5-6

5-2

5-3

5-1

5-7

5-6

5-13

6-4

5-4

5-14

5-9

MISCELLANEOUS

6-3

5-13

5-17

5-13

5-18

5-15

5-16

6-9

123456

6-13

Actual wire harness may be different from illustration.

'05SHARP CORP. (1S0.0e_E)

Sharp R-24AT, R-22AT User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual