SHARP R241CWA, R-241CWAA, R-241CWAC, R-241CWAP Service Manual

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SERVICE MANUAL

S7908R241CPA/

MICROWAVE OVEN

R-241CWAA R-241CWAC R-241CWAP

MODELS

R-241CW AA (Argentina) R-241CWA C (Chile) R-241CWAP (Peru)

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

TABLE OF CONTENTS

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

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

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

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

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

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

FUNCTION OF IMPORTANT COMPONENTS .................................................................................................. 5

SERVICING .........................................................................................................................................................6

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

TOUCH CONTROL PANEL...............................................................................................................................14

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE............................................................. 18

MICROWAVE MEASUREMENT ...................................................................................................................... 24

WIRING DIAGRAM........................................................................................................................................... 25

PICTORIAL DIAGRAM ..................................................................................................................................... 26

CONTROL PANEL CIRCUIT .............................................................................................................................27

PRINTED WIRING BOARD ...............................................................................................................................28

PARTS LIST ..................................................................................................................................................... 29

SHARP CORPORATION

R-241CWAA R-241CWAC R-241CWAP

SERVICE MANU AL

MICROWAVE OVEN

R-241CWAA R-241CWAC R-241CWAP

R-241CWAA (Argentina)

R-241CWAC (Chile)

R-241CWAP (Peru)

GENERAL IMPORTANT INFORMATION

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

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

CAUTION

MICROWAVE RADIATION

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

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

PRODUCT SPECIFICATIONS

APPEARANCE VIEW

OPERATING SEQUENCE

FUNCTION OF IMPORTANT COMPONENTS

SERVICING AND TROUBLESHOOTING CHART

TEST PROCEDURE

TOUCH CONTROL PANEL ASSEMBLY

WARNING

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

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

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

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

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

SHARP CORPORATION

OSAKA, JAPAN

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

MICROWAVE MEASUREMENT

WIRING DIAGRAM

PARTS LIST

R-241CWAA R-241CWAC

R-241CWAP

PRODUCT SPECIFICATIONS

ITEM DESCRIPTION

Power Requirements 220 Volts / 50 Hertz

Power Consumption 1.2 kW Power Output 800 watts nominal of RF microwave energy (IEC 705)

Case Dimensions Width 460 mm

Cooking Cavity Dimensions Width 314 mm

Turntable diameter 295 mm Control Complement Touch Control System

R-241CWAA, R-241CWAC :

R-241CWAP (Peru) :

Single phase, 3 wire earthed 220 Volts / 60 Hertz

Single phase, 2 wire

Operating frequency 2450 MHz

Height 290 mm including foot Depth 372 mm

Height 199 mm Depth 321 mm

Timer (0 - 99 minutes 99 seconds) Microwave Power for Variable Cooking

Repetition Rate;

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

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

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

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

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

EASY DEFROST pad INSTANT ACTION pads Number pads POWER LEVEL pad TIMER/CLOCK pad STOP/CLEAR pad INSTANT COOK/START pad

Set Weight (Approx.) 14 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 (for R-241CWAA & R-241CWAC): EARTH BLUE : NEUTRAL BROWN : LIVE

APPEARANCE VIEW

R-241CWAA R-241CWAC R-241CWAP

OVEN

1. Ventilation openings

2. Oven lamp

3. Door hinges

4. Door safety latches

5. See through door

6. Door seals sealing surfaces

7. Coupling

8. Control panel

9. Waveguide cover

10.Power supply cord

11.Turntable

12.Roller stay

13. Earth wire [R-241CWAP]

TOUCH CONTROL PANEL

1. DIGITAL READOUT

2. INDICATOR

3. EASY DEFROST PAD Press to select the Easy Defrost menu.

4. INSTANT ACTION PADS Press to cook or reheat 6 popular menus.

5. NUMBER PADS Press to enter cooking time, clock time, weight of food.

6. POWER LEVEL PAD Press to select microwave power setting. If not pressed, HIGH is automatically selected. Press to alter the cooking result for automatic operations.

7. TIMER/CLOCK PAD Press to set clock, timer, child lock or demonstration mode.

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

9. INSTANT COOK/START PAD Press once to cook for 1 minute at 100% or increase by 1 minute multiples each time this pad is pressed during cooking. Press to start oven after setting programmes.

1 2

R-241CWAA R-241CWAC

R-241CWAP

OPERATION SEQUENCE

OFF CONDITION

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

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

Figure O-1 on page 25

1. The display flashes "88:88".

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

3. " : " appears in the display.

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

comes on at this time.

MICROWAVE COOKING CONDITION

HIGH COOKING

Enter a desired cooking time with the touching the number keys and start the oven with touching the start key.

Function sequence

Figure O-2 on page 25

The circuits to the power transformer, fan motor and turntable motor are cut off when the 1st. latch switch and 2nd. interlock relay control switch are made open.

The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because the relay RY1 stays closed. Shown in the display is the remaining time.

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

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

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

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

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

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

1st latch switch and 2nd. interlock relay remain closed. The fuse M8A will blow, because the monitor switch is closed and a short circuit is caused.

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

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

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

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

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

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

MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING

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

SETTING;

HIGH

MEDIUM HIGH

MEDIUM

MEDIUM LOW

LOW

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

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

32 sec. ON

24 sec. ON

18 sec. ON

12 sec. ON

6 sec. ON

8 sec. OFF

Approx. 70%

14 sec. OFF

Approx. 50%

20 sec. OFF

Approx. 30%

26 sec. OFF

Approx. 10%

CONDITION DURING DOOR OPEN

SWITCH CONTACT COOKING

1st. latch switches COM-NO Closed Open 2nd. interlock relay

control switch Monitor switch COM-NC Open Closed

COM-NO Closed Open

(NO COOKING)

FUNCTION OF IMPORTANT COMPONENTS

R-241CWAA R-241CWAC R-241CWAP

DOOR OPEN MECHANISM

The door is opened by pulling the door, refer to the Figure D-

Door

Latch Heads 

1st. Latch Switch

Latch Hook

2nd. Interlock Relay Control Switch

Monitor Switch

Figure D-1. Door Open Mechanism

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

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

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

MONITOR SWITCH

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

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

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

CAUTION: BEFORE REPLACING A FUSE TEST THE

1ST LATCH SWITCH, 2ND. INTERLOCK RELAY(RY2), 2ND. INTERLOCK RELAY CONTROL SWITCH, MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE".)

HIGH VOLTAGE FUSE

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

THERMAL CUT-OUT 125˚C (OVEN)

The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of control unit. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the thermal cut-out will open at 125˚C, causing the oven to shut down. The defective thermal cut-out must be replaced with a new one.

THERMAL CUT-OUT 95˚C (MAGNETRON )

The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached to the thermal cut-out , it will open at 95˚C, causing the oven to shut down. When the magnetron has cooled to 75˚C, the thermal cut-out closes and cook cycle will resume.

TURNTABLE MOTOR

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

FAN MOTOR

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

MONITOR RESISTOR 0.8Ω 20W

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

FUSE

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

2. If the wire harness or electrical components are shortcircuited, the fuse M8A blows to prevent an electric shock of fire hazard.

R-241CWAA R-241CWAC

R-241CWAP

SERVICING

WARNING TO SERVICE PERSONNEL

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

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor. WARNING: AGAINST THE CHARGE OF THE

HIGH-VOLTAGE CAPACITOR

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

Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer.

REMEMBER TO CHECK 4R

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. Check all functions.

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

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

TROUBLESHOOTING GUIDE

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

IMPORTANT: If the oven becomes inoperative because of

a blown fuse M8A in the 1st. latch switch 2nd. interlock relay - monitor switch - monitor resistor circuit, check the 1st. latch switch, 2nd. interlock relay, 2nd. interlock relay control switch, monitor switch and monitor resistor before replacing the fuse M8A.

R-241CWAA R-241CWAC R-241CWAP

CK = Check / RE = Replace

CONDITION

OFF CONDITION

ON CONDITION

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

PROBLEM

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

FUSE M8A blows when power supply cord is plugged into wall outlet.

"88:88" does not appear in display but power supply cord is plugged into wall outlet.

Display does not operate properly when stop/clear pad is touched.

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

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

Oven lamp does not light (Display appears.)

Fan motor does not operate. (Display appears.)

Turntable motor does not operate. (Display appears.)

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

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

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

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

ABC

MAGNETRON

CK D

EEEFGGHHIKMN

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE WIRE

HIGH VOLTAGE CAPACITOR

RECK CK RE CK CK CK CK CK

1ST. LATCH SWITCH

2ND. INTERLOCK RELAY CONTROL SWITCH

MONITOR SWITCH

MONITOR RESISTOR

THERMAL CUT-OUT 125˚C (OVEN)

THERMAL CUT-OUT 95˚C (MG)

FAN MOTOR

TURNTABLE MOTOR

FUSE M8A

TOUCH CONTROL PANEL

RELAY (RY-1, RY-2)

FOIL PATERN ON P.W.B.

POWER SUPPLY CORD

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

OVEN LAMP OR SOCKET

WALL OUTLET

MISADJUSTMENT SWITCH

HOME FUSE OR BREAKER

BLOCKED COOLING FAN

BLOCKED VENTILATION

KEY UNIT

H.V. FUSE

R-241CWAA R-241CWAC

R-241CWAP

TEST PROCEDURES

PROCEDURE

LETTER

A MAGNETRON TEST

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

CARRY OUT 3D CHECKS. Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament

terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron

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

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

MICROWAVE OUTPUT POWER (1 litre water load)

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

COMPONENT TEST

The formula is as follows;

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

Our condition for water load is as follows:

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

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

P = 80 x ∆ T

Measuring condition:

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

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

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

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

4. Select the initial and final water temperature so that the maximum difference between the final water

temperature and the ambient temperature is 5˚C.

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

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

7. The water load must be (1000±5) g.

8. “t” is measured while the microwave generator is operating at full power. Magnetron filament heat-up

time is not included. NOTE: The operation time of the microwave oven is “t + 2” sec. 2 sec. is magnetron filament heat-up time. Measuring method:

1. Measure the initial temperature of the water before the water is added to the vessel.

(Example: The initial temperature T1 = 11˚C)

2. Add the 1 litre water to the vessel.

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

4. Operate the microwave oven at HIGH for the temperature of the water rises by a value ∆ T of

(10 ± 2)˚C.

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

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

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

TEST PROCEDURES

HIGH VOLTAGE RECTIFIER

R-241CWAA R-241CWAC R-241CWAP

PROCEDURE

LETTER

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

Temperature after (52 + 2) = 54 sec. ..................................................................... T2 = 21°C

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

Measured output power

The equation is “P = 80 x ∆T” ...................................................... P = 80 x 10°C = 800 Watts

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

CAUTION: 1°C CORRESPONDS TO 80 WATTS. REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

1000g

T1˚C

B POWER TRANSFORMER TEST

COMPONENT TEST

1000g

Heat up for 54 sec.

1000g

T2˚C

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

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

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

R-241CWAA/241CWAC R-241CWAP (Peru)

Primary winding 1.6 ohms approximately 1.35 ohms approximately Secondary winding 128 ohms approximately 123 ohms approximately Filament winding less than 1 ohm

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

C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST

HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS.

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

CARRY OUT 4R CHECKS.

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.

R-241CWAA R-241CWAC

R-241CWAP

TEST PROCEDURES

PROCEDURE

LETTER

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.

CARRY OUT 4R CHECKS.

E SWITCH TEST

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

CARRY OUT 3D CHECKS.

Plunger Operation COM to NO COM to NC

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

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

COMPONENT TEST

Table: Terminal Connection of Switch

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

CARRY OUT 4R CHECKS.

F MONITOR RESISTOR TEST

CARRY OUT 3D CHECKS. Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor.

The resistance of monitor resistor is approx. 0.8 ohms.

If incorrect readings are obtained, replace the monitor resistor. CARRY OUT 4R CHECKS.

G THERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity test across the two terminals as described in the below.

CARRY OUT 4R CHECKS.

Parts Name (closed circuit). (open circuit). temperature is approx. 20˚C.) Thermal cut-out 125˚C Thermal cut-out 95˚C Below 75˚C Above 95˚C Closed circuit.

Temperature of "ON" condition Temperature of "OFF" condition Indication of ohmmeter (When room

This is not resetable type. Above 125˚C Closed circuit

Table: Thermal Cut-out Test

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

TEST PROCEDURES

R-241CWAA R-241CWAC R-241CWAP

PROCEDURE

LETTER

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

An open circuit thermal cut-out (OVEN) indicates that the food in the oven cavity may catch fire, this may be due to overheating produced by improper setting of the cooking time or failure of the control panel.

H MOTOR WINDING TEST

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

terminals as described in the table below.

If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS.

COMPONENT TEST

Table: Resistance of Motor

Resistance

Motors R-241CWAA/241CWAC R-241CWAP (Peru) Fan motor Approximately 390 ohms Approximately 166 ohms Turntable motor Approximately 12 kohms Approximately 12 kohms

I FUSE M8A

CARRY OUT 3D CHECKS. If the fuse M8A is blown when the door is opened, check the 1st latch switch,

interlock relay control switch, monitor switch and monitor resistor.

If the fuse M8A is blown by incorrect door switching, replace the defective switch(s) and the fuse M8A. If the fuse M8A is blown, there is a shorts or grounds in electrical parts or wire harness.

Check them and replace the defective parts or repair the wire harness. CARRY OUT

CAUTION: Only replace fuse with the correct value replacement.

4R CHECKS.

J HIGH VOLTAGE FUSE TEST

CARRY OUT 3D CHECKS. If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron. Check them and replace the defective parts and the high voltage fuse.

CARRY OUT 4R CHECKS. CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACE-

MENT.

2nd. interlock relay, 2nd.

K TOUCH CONTROL PANEL ASSEMBLY TEST

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

1. Key Unit. The following symptoms indicate a defective key unit. Replace the key unit.

R-241CWAA R-241CWAC

R-241CWAP

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.

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

2-1 Programming problems.

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

2-2 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 up. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker.

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

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

L KEY UNIT TEST

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

G 7

G 8

G 9

G10

G 6 G 5 G 4 G 3 G 2 G 1

Bebida

Verdura

Congelada



Arroz/ Pasta

6 3

Cronómetro

Reloj

Papa

Asada

DESCONGELACION

AUTOMATICA

Verdure

1 7

Fresca

Principal



Plato

Nivel de

Potencia

Detención

Cancelación

Comienzo

Minuto Extra



M RELAY TEST

Remove the outer case and check voltage between Pin No 3 of the 2 pin connector (A) and common terminal (lower terminal) of the relay (RY2) on the control unit with an A.C. voltmeter. The meter should indicate 220 volts, if not check oven circuit.

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

TEST PROCEDURES

R-241CWAA R-241CWAC R-241CWAP

PROCEDURE

LETTER

COMPONENT TEST

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. 15.0V D.C. Oven lamp / Turntable motor / Cooling fan motor RY2 Approx. 14.0V D.C. Power transformer

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

(PWB) IS OPEN

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

Problem: POWER ON, indicator does not light up.

STEPS OCCURANCE CAUSE OR CORRECTION

The rated voltage is not applied between Pin

1 No. 3 of the 2 pin connector (A) and the. Check supply voltage and oven power cord.

common terminal of the relay RY2. The rated voltage is applied to primary side Low voltage transformer or secondary circuit defective.

of low voltage transformer. Check and repair.

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

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

NOTE: At the time of making these repairs,

(J1)

make a visual inspection of the varistor. Check for burned 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 defec-

VRS1

tive parts.

AC (N) FM TTM OL

RY2

RY1

R-241CWAA R-241CWAC

R-241CWAP

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) Key Unit (2) Control Unit

The principal functions of these units and their related signals are explained below.

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through R81, R82, R83, R90, R91 and R92. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through R60, R61, R62, R63 to perform the function that was requested.

Control Unit

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

1) ACL

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

2) Indicator Circuit

This circuit consists of 4-digits, 12-segments and 3common electrodes using a Liquid Crystal Display.

3) Power Source Circuit

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

Symbol Voltage Application

VC -5V LSI(IC1)

4) Relay Circuit

To drive the magnetron, fan motor, turntable motor and light the oven lamp.

5) Buzzer Circuit

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

6) Synchronizing Signal Circuit

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

7) 2nd. Interlock Relay Control Switch (Door Sensing Switch)

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

DESCRIPTION OF LSI

LSI(IZA906DR)

The I/O signal of the LSI(IZA906DR) are detailed in the following table.

Pin No. Signal I/O Description

1-12 SEG0-SEG11 OUT Segment data signal.

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

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

SEG 0 (1) ..............................S12 SEG 6 (7)................................. S6

SEG 1 (2) ..............................S11 SEG 7 (8)................................. S5

SEG 2 (3) ..............................S10 SEG 8 (9)................................. S4

SEG 3 (4) ................................S9 SEG 9 (10)............................... S3

SEG 4 (5) ................................S8 SEG 10 (11)............................. S2

SEG 5 (6) ................................S7 SEG 11 (12)............................. S1

13 R60 IN Signal coming from touch key.

When either G10 line on key matrix is touched, a corresponding signal out of R81 -R83 and R90 - R92 will be input into R60. When no key is touched, the signal is held at “H” level.

14 R61 IN Signal similar to R60.

When either G9 line on key matrix is touched, a corresponding signal will be input into R60.

R-241CWAA R-241CWAC R-241CWAP

15 R62 IN

Signal similar to R60.

When either G8 line on key matrix is touched, a corresponding signal will be input into R60.

16 R63 IN Signal similar to R60.

When either G7 line on key matrix is touched, a corresponding signal will be input into R60.

17 AIN0 IN To input signal which communicates the door open/close information to LSI.

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

18-20 AIN1-AIN3 IN Terminal to change functions according to the Model.

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

21 VSS IN Power source voltage: -5V.

VSS voltage of power source circuit input.

22 R70 OUT Magnetron high-voltage circuit driving signal.

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

P-HI

P-70

OFF

24 sec.

OFF

8 sec.

H : GND

L : -5V H : GND

L : -5V

23 PULSE OUT Signal to sound buzzer (2.0 kHz).

A: key touch sound. B: Completion sound.

0.12 sec.

2.4 sec.

H : GND L : -5V

H : GND

L : -5V

R-241CWAA/ R-241CWAC R-241CWAP (Peru)

0.1 sec.

2.0 sec.

H : GND L : -5V

H : GND

L : -5V

24 R72 OUT Oven lamp, fan motor and turntable motor driving signal.

To turn on and off shut off relay (RY1). The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.

20.0 msec.

During cooking

R-241CWAA/ R-241CWAC R-241CWAP (Peru)

H : GND

L : -5V

16.7 msec.

During cooking

H : GND

L : -5V

R-241CWAA R-241CWAC

R-241CWAP

Pin No. Signal I/O Description

25 R73 OUT Terminal not used. 26 INT2 IN Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

H : GND

20.0 msec

R-241CWAA/R-241CWAC R-241CWAP (Peru)

L : -5V

27 R81 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G6 line keys on key matrix is touched.

28 R82 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G5 line keys on key matrix is touched.

29 R83 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G4 line keys on key matrix is touched.

30 R90 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G3 line keys on key matrix is touched.

16.7 msec

H : GND

L : -5V

31 R91 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G2 line keys on key matrix is touched.

32 R92 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G1 line keys on key matrix is touched.

33 XIN IN Internal clock oscillation frequency setting input.

The internal clock frequency is set by inserting the capacitor-resistor oscillation circuit with respect to XOUT terminal.

34 XOUT OUT Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

35 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. 36 HOLD IN/OUT Connected to GND. 37 VLC IN Signal synchronized with commercial power source frequency.

Signal similar to VSS. 38 COM1 OUT Common data signal: COM1.

Connected to LCD (Pin No. C1) 39 COM2 OUT Common data signal: COM2.

Connected to LCD (Pin No. C2) 40 COM3 OUT Common data signal: COM1.

Connected to LCD (Pin No. C3) 41 COM4 OUT Terminal not used. 42 VDD IN Power source voltage input terminal.

Connected to GND.

SERVICING

R-241CWAA R-241CWAC R-241CWAP

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 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 2SA933S DTA143ES KRA101M

KRC243M

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 AND PRESENTS A HAZARD .

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

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 so long enough that they may be separated from each other. For those models, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if the 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: 30W (It is recommended to use a soldering iron with a grounding terminal.)

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

3) Others: Hand tools

5. Other Precautions

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

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

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

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

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

R-241CWAA R-241CWAC

R-241CWAP

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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

before operating the oven.

1. Disconnect oven from power supply.

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

Carry out any remedial work that is necessary before operating the oven. Do not operate the oven if any of the following conditions exist;

1. Door does not close firmly.

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

3. The door gasket or seal or damaged.

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

4. The door is bent or warped.

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

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

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

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

3. If the door is not closed.

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

WARNING FOR WIRING

To prevent an electric shock, take the following manners.

1. Before wiring,

1) Disconnect the power supply.

2) Open the door and wedge the door open.

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

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

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

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

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

4) Movable parts (to prevent a fault) Fan blade, Fan motor, Switch

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

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

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

OUTER CASE REMOVAL

To remove the outer case proceed as follows.

1. Disconnect oven from power supply.

2. Open the oven door and wedge it open.

3. Remove the eight (8) screws from rear and along the side edge of case.

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

5. Lift the entire case from the oven.

POWER TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads (main wire harness and H.V. fuse) from power transformer.

3. Disconnect the filament lead of power transformer from the magnetron.

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

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

N.B.; Step 1, 2 and 6 form the basis of the 3D checks. CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR

BEFORE TOUCHING ANY OVEN COMPONENT OR WIRING.

4. Disconnect the filament lead of the power transformer from high voltage capacitor.

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

6. Remove the transformer.

HIGH VOLTAGE COMPONENTS REMOVAL

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flate type small screw driver

(HIGH VOLTAGE CAPACITOR, HIGH VOLTAGE RECTIFIER ASSEMBLY AND H.V. FUSE)

To remove the components, proceed as follows.

1. CARRY OUT 3D CHECKS.

2. Disconnect the H.V. fuse from the power transformer.

3. Disconnect the H.V. wire of the H.V. rectifier assembly from the magnetron.

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

5. Disconnect the filament lead of the power transformer

Disconnect the H.V. fuse from the high voltage capacitor.

9. Now H.V. rectifier assembly, H.V. fuse and H.V. capacitor should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-

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

from the H.V. capacitor.

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

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

CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE

RECTIFIER. WHEN REPLACING IT, REPLACE HIGH VOLTAGE RECTIFIER ASSEMBLY.

MAGNETRON REPLACEMENT

Removal

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the magnetron.

3. Carefully remove the three (3) screws holding the magnetron to the waveguide flange.

4. Lift up magnetron with care so that the magnetron antenna is not hit by any metal object around antenna.

5. Now, the magnetron is free.

Re-install

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

three (3) screws.

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

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

CAUTION: WHEN REPLACING THE MAGNETRON, BE

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

R-241CWAA R-241CWAC R-241CWAP

OVEN LAMP SOCKET REMOVAL

1. CARRY OUT 3D CHECKS.

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

3. Tear the cushion from the light mount plate.

4. Bend the tab of the light mount plate holding the oven.

5. Lift up the oven lamp socket.

6. Now, the oven lamp socket is free.

POSITIVE LOCK® CONNECTOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Pushing the lever of positive lock® connector.

3. Pull out the positive lock® connector.

CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-

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

Figure C-1. Oven lamp socket

Terminal

Positive lock® connector

Push

Lever

Pull down

Figure C-2 Positive lock® connector

R-241CWAA R-241CWAC

R-241CWAP

POWER SUPPLY CORD REPLACEMENT

Removal

1. CARRY OUT 3D CHECKS.

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

241CWAC)

Disconnect the brown wire lead of the power supply cord

from the fuse holder, referring to the Figure C-3 (a).

4. Cut away the connector.

5. Release the power supply cord from the rear cabinet, referring to the Figure C-3 (b).

6. Now, the power supply cord is free.

Re-install

1. Insert the moulding cord stopper of power supply cord

OVEN CAVITY BACK PLATE

SCREW

GREEN/YELLOW  WIRE

BLUE WIRE

POWER SUPPLY CORD

OVEN CAVITY

BROWN WIRE

FUSE HOLDER

(for R-241CWAA/ R-

BLUE  WIRE

BROWN  WIRE

into the square hole of the oven cavity back plate, referring to the Figure C-3 (b).

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

R-241CWAA/ R-241CWAC)

Connect the brown wire lead of power supply cord to the fuse holder correctly, referring to the Pictorial Diagram.

Strip the blue wire lead of the power supply cord and wire lead of the main wire harness for 15mm lengh from its end.

5. Wind the conductor of the blue wire lead of the power supply cord and the conductor of the wire lead of the main wire harness each other.

6. Insert them into the connector. And clamp it.

7. CARRY OUT 4R CHECKS.

Blue wire lead of power supply cord

Wire lead of the  main wire harness

15 mm

Conductor:  Stripped portion 

(for

Power Supply  Cord

Moulding Cord Stopper

Oven Cavity  Back Plate

R-241CWAA/ R-241CWAC R-241CWAP (Peru)

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

TURNTABLE MOTOR REPLACEMENT

Removal

1. Disconnect the oven from the power supply.

2. Remove the turntable and turntable support from the oven cavity.

3. Turn the oven over.

4. Cut the four (4) bridges holding the turntable motor cover to the bottom plate with the cutting pliers as shown in Figure C-4.

CAUTION: DO NOT DROP THE TURNTABLE MOTOR

COVER INTO THE OVEN AFTER CUTTING THE BRIDGES. BECAUSE IT WILL DAMAGE THE WIRE LEADS OF THE MOTOR AND IT IS DIFFICULT TO REMOVE IT OUT OF THE OVEN.

5. Remove the turntable motor cover from the bottom plate.

6. Disconnect the wire leads from the turntable motor.

7. Remove the single (1) screw holding the turntable motor to the oven cavity.

8. Remove the turntable motor from the oven cavity.

Cutting Pliers

Bridges

Screw; XHTSD40P08RV0 or XFPSD40P08K00

Turnrable Motor Cover

Tab

Hole

Connector CE-230

Square  Hole

Figure C-3 (b) Power Supply Cord Replacement

9. Remove the O-ring and washer from the turntable motor.

10.Now, the turntable motor is free.

Re-install

1. Remove the any sharp edges on the turntable motor cover and the bottom plate with the cutting pliers.

2. Re-install the O-ring.

3. Apply the grease (Shinetsu silicone grease G-420 of Sinetsu Chemical Co. Ltd. or Toray Silicone grease SH14 of Toray Silicone Co., Ltd.) to the O-ring and the base of the turntable motor shaft as shown in Figure C-5.

4. Re-install the turntable motor with the O-ring and washer to the oven cavity with the single (1) screw.

5. Re-connect the wire leads to the turntable motor.

6. Insert the tab of the turntable motor cover into the hole of the bottom plate as shown in Figure C-4.

7. Re-install the turntable motor cover to the bottom plate with one (1) screw XHTSD40P08RV0 or XFPSD40P08K00 as shown in Figure C-4.

Washer

O-ring

Apply grease here

Base of turntable motor shaft

Washer

O-ring

Bottom Plate

Figure C-4. Turntable Motor Cover

Turntable motor

Figure C-5. Washer and O-ring Installation and

Grease Applying.

FAN MOTOR REPLACEMENT

Shaft

Table

Center of bracket

R-241CWAA R-241CWAC R-241CWAP

REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the fan motor.

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

4. Remove the chassis support .

5. Release the filament lead of the power transformer and the H.V. wire from the fan duct.

6. Remove the one (1) screw holding the light mounting plate to the oven cavity.

7. Release the wire leads (to the oven lamp) from the hole of the fan duct.

8. Remove the one (1) screw holding the fan duct to the waveguide flange.

9. Release the fan motor assembly from the oven cavity.

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

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

CAUTION:

• Make sure that any pieces do not enter the gap between the rotor and the stator of the fan motor. Because the rotor is easy to be shaven by pliers and metal pieces may be produced.

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

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

12 Remove the fan blade assembly from the shaft of the fan

motor by pulling and rotating the fan blade with your hand.

13 Now, the fan blade will be free.

CAUTION:

• Do not re-use the removed fan blade because the hole (for shaft) may be larger than normal.

Coil

Groove joint pliers

14. Remove the two (2) screws holding the fan motor to the fan duct.

15. Now, the fan motor is free.

INSTALLATION

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

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

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

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

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

CAUTION:

• Do not hit the fan blade strongly when installed

because the bracket may be transformed.

• Make sure that the fan blade rotates smooth after

installed.

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

6. Install the fan motor assembly to the oven cavity by fitting the tabs of the fan duct into the holes of the oven cavity and the waveguide flange.

7. Re-install the light mounting plate to the oven cavity with the one (1) screw.

8. Insert the end of the chassis support into the slit of the oven cavity rear cabinet.

9. Re-install the chassis support to the oven cavity front plate with the one (1) screw.

10. Install the filament lead and the H.V. wire into the hole of the fan duct .

11. Re-install the wire leads (to the oven lamp) to the hole of the fan duct.

12. Connect the wire leads to the fan motor, referring to the pictorial diagram.

Side View

Stator

Gap

Bracket

Rear View

Rotor

Shaft

Axis

Stator

Rotor

CONTROL PANEL ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the leads and connectors from the control unit.

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

4. Remove the chassis support from the oven.

5. Lift up the control panel and release it from the oven

6. Now, the control panel assembly is free.

the front plate of the oven cavity.

cavity.

These are the positions that should be pinched with pliers

NOTE: 1. Before attaching a new key unit, wipe off remaining

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

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

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

R-241CWAA R-241CWAC

R-241CWAP

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

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from the switches and control panel.

3. Remove the control panel assembly from the oven cavity front flange. Refer to chapter "CONTROL PANEL ASSEMBLY REMOVAL".

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

5. Remove latch hook assembly from oven flange.

6. To remove the secondary interlock switch.

6-1. Pull out the 1st. latch switch from the latch hook, by

pushing outward on the tab that is holding the switch. But the switch will be caught by the bar of the latch hook.

6-2. Then pull out the switch while pushing the plunger of the

switch again.

6-3. Now the 1st. latch switch is free.

7. To remove the monitor switch or 2nd. interlock relay control switch.

7-1. With pushing outward on the tab that is holding the

switch, turn the switch so that the pole is an axis.

7-2. Pull out the switch from the latch hook. Do not break the

pole or tab of the latch hook.

7-3. Now the switch is free.

Re-install

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

in the upper position.

2. Re-connect wire leads to each switch. Refer to chapter "Pictorial Diagram".

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

4. Re-install the control panel assembly to the oven cavity front flange.

5. Re-connect wire leads to the control unit. Refer to chapter "Pictorial Diagram".

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

Latch Hook

2nd. Interlock

Pole

Monitor Switch

1st. Latch Switch

Tab

Relay Control Switch

Outward

Tab

Bar

Outward

Figure C-6. Latch Switch Removal

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

1. CARRY OUT 3D CHECKS. If the 1st. latch switch, 2nd. interlock relay control switch and

monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

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

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

4. Secure the screws firmly.

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

After adjustment, make sure of the following.

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

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

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

4. The contacts of 1st. latch switch and 2nd. interlock relay control switch open within 1.6mm gap between right side of cavity face plate and door when door is open.

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

Latch Heads

Door



1st. Latch Switch

Latch Hook

2nd. Interlock Relay Control Switch

Monitor Switch

Figure C-7. Latch Switch Adjustments

DOOR REPLACEMENT

Lower Oven Hinge

Lower Oven Hinge

Upper Oven Hinge

Upper Oven Hinge

Door Panel

Choke Cover

R-241CWAA R-241CWAC R-241CWAP

REMOVAL

Disconnect the power supply cord

2. Open the door slightly.

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

4. Pry the principles of the lever and lift up the choke cover by inserting a putty knife in order shown in figure C-8.

5. Release choke cover from door panel.

6. Now choke cover is free.

Choke Cover

Door Frame

Putty Knife

Figure C-8. Door Disassembly

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

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

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

10.Release door panel from ten (10) tabs of door frame and remove door frame by sliding the door panel downward.

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

12.Tear sealer film from door panel.

13.Now, door panel is free.

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

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

16.Remove door screen from door frame.

17.Now, door screen is free.

RE-INSTALL

1. Re-install door screen to door frame.

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

3. Re-install door panel to door frame by fitting ten (10) tabs of door frame to ten (10) holes of door panel.

4. Hold the door panel to door frame with the four (4) screws.

5. Put sealer film on door panel. Refer to "Sealer Film" and figure C-10, on how to handle the new film.

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

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

Note: After any service to the door; (A) Make sure that 1st. latch switch, 2nd. interlock relay

control switch and monitor switch are operating properly. (Refer to chapter "Test Procedures".).

(B) An approved microwave survey meter should be

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

After any service, make sure of the following :

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

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

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

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

NOTE:

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

Figure C-9. Door Replacement

SEALER FILM

Installation

1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-10.

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

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

Sealer film

Backing film

Adhesive tape

Figure C-10. Sealer film

R-241CWAA R-241CWAC

R-241CWAP

MICROWAVE MEASUREMENT

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

REQUIREMENT

The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from external surface of the oven.

PREPARATION FOR TESTING:

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

1. Make sure that the test instrument is operating normally as specified in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing.

Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M

2. Place the oven tray into the oven cavity.

3. Place the load of 275 ± 15ml of water initially at 20 ± 5˚C in the centre of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically non-conductive material such as glass or plastic. The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately.

4. Close the door and turn the oven ON with the timer set for several minutes. If the water begins to boil before the survey is completed, replace it with 275ml of cool water.

5. Move the probe slowly (not faster that 2.5cm/sec.) along the gap.

6. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven.

mW cm

SHARP

Microwave leakage measurement at 5 cm distance

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

for R-241CWAP  (Peru)

R-241CWAA

for

R-241CWAC

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

THERMAL  CUT-OUT 95˚C (MG)

R-241CWAA R-241CWAC R-241CWAP

60Hz

220V

BRN

LIVENEUTRAL

EARTH

G-Y

BLU

50Hz

220V

BRN

LIVENEUTRAL

G-Y

BLU

Figure O-1 Oven Schematic-OFF Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START KEY TOUCHED.

EARTH

FUSE

M8A

THERMAL  CUT-OUT 125˚C (OVEN)

COM.

2ND. 

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. LATCH SWITCH

INTERLOCK

RELAY

N.O.

RY-2

RY-1

CONTROL

UNIT

B2A3

OVEN LAMP

FAN MOTOR

MONITOR

RESISTOR

0.8/20W

TTM

MONITOR SWITCH

TURNTABLE MOTOR

POWER TRANSFORMER

CAPACITOR

H.V. FUSE

0.6A

0.94µF



AC2000V 

for R-241CWAP



 (Peru)

 CAPACITOR

0.75µF AC2100V

MAGNETRON

H.V. RECTIFIER

for R-241CWAP  (Peru)

BRN

60Hz

LIVENEUTRAL

220V

G-Y

BLU

EARTH

R-241CWAA

for

R-241CWAC

BRN

50Hz

220V

BLU

THERMAL  CUT-OUT 95˚C (MG)

N.O.

RY-2

RELAY

CONTROL

LIVENEUTRAL

EARTH

G-Y

FUSE

M8A

THERMAL  CUT-OUT 125˚C (OVEN)

COM.

2ND. 

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. LATCH SWITCH

INTERLOCK

Figure O-2 Oven Schematic-ON Condition

UNIT

B2A3

RY-1

OVEN LAMP

FAN MOTOR

MONITOR

RESISTOR

0.8/20W

TTM

MONITOR SWITCH

TURNTABLE MOTOR

POWER TRANSFORMER

CAPACITOR

H.V. FUSE

0.6A

0.94µF



AC2000V 

for R-241CWAP



 (Peru)

 CAPACITOR

0.75µF AC2100V

MAGNETRON

H.V. RECTIFIER

R-241CWAA R-241CWAC

R-241CWAP

OVEN CAVITY

BACK PLATE

OVEN CAVITY

BACK PLATE

for R-241CWAA & R-241CWAC for R-241CP (Peru)

POWER 

SUPPLY 

CORD

POWER 

SUPPLY 

EARTH

LIVE

B

R

L

B

NEUTRAL

CORD

LIVE

B

R

L

B

NEUTRAL

G/Y

THERMAL CUT-OUT

(MG.)

FUSE AND 

HOLDER

CONNECTOR

BLK

RED

"N" label [for R-241CWAA (Argentina) only]

WHT

HIGH 

VOLTAGE

CAPACITOR

H.V.

RECTIFIER

HIGH VOLTAGE

FUSE

MAGNETRON

POWER 

TRANSFORMER

HIGH VOLTAGE COMPONENTS

GRY

WHT

ORG

OVEN LAMP

& SOCKET

RED

ORG

RED

MONITOR RESISTOR

2ND. INTERLOCK 

RELAY CONTROL 

SWITCH

NOTE: Nuetral (WHT) wire

must be connected to the

terminal with black mark on the

Black Mark

oven light socket.

WHT

GRY

WHT

THERMAL CUT-OUT

(OVEN)

GRY

GRN

N.O.

COM.

GRN

BLK

ORG

RED

CN-A

GRY

ORG

GRY

RED

CN-B

ORG

FAN MOTOR

GRY

ORG

GRY

GRN

GRY

N.C.

COM.

MONITOR 

SWITCH

ORG

TURNTABLE

MOTOR

GRY

WHT

N.O.

COM.

1ST. LATCH 

SWITCH

ORG

GRY

Figure S-1. Pictorial Diagram

SP30

CONTROL UNIT

IC-1

CN-A

CN-B

RY1

RY2



RELAY



LIQUID CRYSTAL DISPLAY

0.1µ/50v C5

2SA933 Q1

CONTROL UNIT

R2 1k

COOK DEF KG QTY CHECK

C4 47µ/16v

–

C3 0.01µ/16v

C2 470µ/25v

–

C1 0.1µ/50v

C 1 C 2 C 3 S 1 S 2 S 3 S 4 S 5 S 6 S 7 S 8 S 9

S10 S11 S12

R3 15k

HZ4C3 ZD1

15k R5

3.3k R30

R1 910 1/2w

SP30

R-241CWAA R-241CWAC R-241CWAP



MIinuto Extra

Principal

KEY UNIT

G10

10kF R70

0.01µ/16v C70

VDD 42

SEG 0

COM 4

SEG 1

COM 3

COM 2

SEG 2

SEG 3

COM 1

SEG 4

VLC

SEG 5

HOLD

SEG 6

33p C71

RESET 35

SEG 7

R92

R91

X IN

X OUT

10515

SEG 8

SEG 9

SEG10

SEG11

R90

R83

R82

R81

R73

R72

INT2

PULSE

IC1 IZA906DR

R60

R61

R62

R63

AIN0

AIN1

AIN2

AIN3

R80 15k

R70

VSS

15k R50 

15k R51

15k R52

15k R53

15k R54

15k R55

DESCONGELACION

Papa

G 6 G 5 G 4 G 3 G 2 G 1

C61 C62

Nivel de

Potencia

AUTOMATICA

Asada

Verdura

Bebida

Congelada

G 8

G 7

Comienzo

Detención

Cancelación

Plato

Fresca

Verdura



Reloj

Cronómetro

Pasta

Arroz/

G 9

C63

C61~C64

330pF/50v x 4

C64

R61 220k R62 220k

(J6) (J4)

(J2) 3.3k

(J7) (J5)

(J3) 4.3k

R63 220k R64 220k

R57 15k

R58 15k

R59 15k

R60 15k

4.7k R41

0.01µ/16v C40

R40 15k

Figure S-2. Control Panel Circuit

R20 15k

C6 0.01µ/16v

– +

C20 0.1µ/50v

Q30

KRA101M

R4 15k

Q20

KRA101M

–

C21

10µ/35v

Q22

DTA143ES

D1~D4:11ES1 T1

VRS1

(J1)

 R-241CWAA

AC220V

50Hz for

 R-241CWAC

60Hz for R-241CWAP

Q21

KRC243M

D21D22

RY1

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

RY2

MICRO

R22

D20

COM

2ND.

D40

INTERLOCK

RELAY

CONTROL 

SWITCH

 Resistor 3.3k (J2) and 4.3K (J3) for R-241CWAA/241CWAC

IF NOT SPECIFIED, 1/4w ± 5%

IF NOT SPECIFIED, 1SS270A

(J2) & (J3):

 Jumper wire (J2) and open (J3) for R-241CWAP (Peru)

NOTE :

R-241CWAA R-241CWAC

R-241CWAP

DIP

R41

R61

C61

R62

C62

R63

C63

R64

C64

R60 R59 R58 R57 R40 C40

R80

R55

R54

(J6) (J4) (J2) 8

R53

R52

R51

R50

1 IC1

C70

(J7) (J5) (J3)

(CF1)

R70

R30

ZD1

C71

SP30

Q30

Q22

D22

Q21

DOOR SW

C21

D20 D40

VRS1

CN - B

AC (N) FM TTM OL

Figure S-3. Printed Wiring Board

C20

R20

Q20

RY2

D21

(J1)

RY1

PARTS LIST

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

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

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

ELECTRIC PARTS

1- 1 QSW-MA131WRE0 1- 2 QSW-MA132WRE0 Monitor switch 1 AH 1- 3 QACC-A102WRE0 Power supply cord for Argentina [R-241CWAA] 1 AU 1- 3 QACC-A077WRE0 Power supply cord for Chile [R-241CWAC] 1 AT 1- 3 QACC-A058WRE0 Power supply cord for Peru [R-241CWAP] 1 AQ 1- 4 QSOCLA022WRE0 Oven lamp socket 1 AG 1- 5 FH-DZA082WRK0 High voltage rectifier 1 AQ

1- 6 RC-QZA168WRE0

1- 6 RC-QZA126WRE0

1- 6 RC-QZA168WRE0

1- 6 RC-QZA126WRE0

1- 6 RC-QZA135WRE0

1- 7 RMOTEA340WRE0 Fan motor for Argentina [R-241CWAA] 1 AX 1- 7 RMOTEA362WRE0 Fan motor (Interchangeable)for Argentina [R-241CWAA] 1 AY 1- 7 RMOTEA340WRE0 Fan motor for Chile [R-241CWAC] 1 AX 1- 7 RMOTEA362WRE0 Fan motor (Interchangeable)for Chile [R-241CWAC] 1 AY 1- 7 RMOTEA362WRE0 Fan motor for Peru [R-241CWAP] 1 AY 1- 7 RMOTEA291WRE0 Fan motor (Interchangeable) for Peru [R-241CWAP] 1 AX 1- 8 RV-MZA284WRE0 Magnetron 1 BR

∆

1- 9 RLMPTA069WRE0 Oven lamp 1 AK 1- 9 RLMPTA029WRE0 Oven lamp (Interchangeable) 1 AL 1-10 RMOTDA173WRE0 Turntable motor 1 AX 1-10 RMOTDA226WRE0 Turntable motor (Interchangeable) 1 AT 1-11 RTHM-A078WRE0 Thermal cut-out 125˚C 1 AK 1-12 RTRN-A563WRE0 Power transformer 220V/50Hz for Argentina [R-241CWAA] 1BP

1-12 RTRN-A563WRE0 Power transformer 220V/50Hz for Chile [R-241CWAC] 1BP

1-12 RTRN-A565WRE0 Power transformer 220V/60Hz for Peru [R-241CWAP] 1BN

1-13 RR-WZA022WRE0 Monitor resistor 0.8Ω 20W 1 AK 1-14 QFS-IA004WRE0 H.V. fuse 0.6A 1 AK

1-15 QFSHDA019WRE0 Fuse holder 1 AH 1-16 QFS-CA010WRE0 Fuse M8A 1 AE 1-17 RTHM-A079WRE0 Thermal cut-out 95˚C 1 AL

2- 1 GCABUA696WRP0 Outer case cabinet 1 AY 2- 2 FDAI-A203WRY0 Bottom plate 1 BB 2- 3 GLEGPA074WRE0 Foot 2 AC

3- 1 CPWBFA813WRK0 Control unit for Argentina [R-241CWAA] 1 BG 3- 1 CPWBFA813WRK0 Control unit for Chile [R-241CWAC] 1 BG 3- 1 CPWBFA812WRK0 Control unit for Peru [R-241CWAP] 1 BF 3- 1A QCNCMA431DRE0 2-pin connector (A) 1 AC 3- 1B QCNCMA275DRE0 2-pin connector (B) 1 AB C1 RC-KZA087DRE0 Capacitor 0.1 uF 50V 1 AA C2 VCEAB31EW477M Capacitor 470 uF 25V 1 AC C3 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C4 VCEAB31CW476M Capacitor 47 uF 16V 1 AA C5 RC-KZA087DRE0 Capacitor 0.1 uF 50V 1 AA C6 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C20 VCEAB31HW104M Capacitor 0.1 uF 50V 1 AM C21 VCEAB31VW106M Capacitor 10 uF 35V 1 AA C40 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C61-64 VCKYD11HB331K Capacitor 330 pF 50V 4 AA C70 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C71 VCCCF61HH330J Capacitor 33 pF 50V 1 AB D1-4 VHD11ES1///-1 Diode (11ES1) 4 AB D5 VHD1SS270A/-1 Diode (1SS270A) 1 AA D20-22 VHD1SS270A/-1 Diode (1SS270A) 3 AA D40 VHD1SS270A/-1 Diode (1SS270A) 1 AA IC1 RH-IZA906DRE0 LSI 1 AM Q1 VS2SA933S//-3 Transistor (2SA933) 1 AB Q20 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q21 VSKRC243M//-3 Transistor (KRC243M) 1 AC Q22 VSDTA143ES/1B Transistor (DTA143ES) 1 AA Q30 VSKRA101M//-3 Transistor (KRA101M) 1 AB R1 VRD-B12HF911J Resistor 910 ohm 1/2W 1 AA

1st. latch switch & 2nd. interlock relay control switch

High voltage capacitor 0.94µF/2000V for Argentina [R-241CWAA] High voltage capacitor 0.94µF/2000V(Interchangeable)[R-241CWAA] High voltage capacitor 0.94µF/2000V for Chile [R-241CWAC] High voltage capacitor 0.94µF/2000V(Interchangeable)[R-241CWAC] High voltage capacitor 0.75µF/2100V for Peru [R-241CWAP]

CABINET PARTS

CONTROL PANEL PARTS

2AG

1AV 1AX 1AV 1AX 1AV

R-241CWAA R-241CWAC R-241CWAP

R-241CWAA R-241CWAC

R-241CWAP

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

R2 VRD-B12EF102J Resistor 1.0k ohm 1/4W 1 AA R3-5 VRD-B12EF153J Resistor 15k ohm 1/4W 3 AA R20 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA R30 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA R40 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA R41 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R50-55 VRD-B12EF153J Resistor 15k ohm 1/4W 6 AA R57-60 VRD-B12EF153J Resistor 15k ohm 1/4W 4 AA R61-64 VRD-B12EF224J Resistor 220k ohm 1/4W 4 AA R70 VRN-B12EK103F Resistor 10k ohm 1/4W 1 AA R80 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA (J2) VRD-B12EF332J Resistor 3.3k ohm 1/4W for Argentina [R-241CWAA] 1 AA (J2) VRD-B12EF332J Resistor 3.3k ohm 1/4W for Chile [R-241CWAC] 1 AA (J3) VRD-B12EF432J Resistor 4.3k ohm 1/4W for Argentina [R-241CWAA] 1 AA (J3) VRD-B12EF432J Resistor 4.3k ohm 1/4W for Chile [R-241CWAC] 1 AA RY1 RRLY-A111DRE0 Relay (JV12S-KT) 1 AL RY2 RRLY-A094DRE0 Relay (OMIF-S-112LM) 1 AN SP30 RALM-A014DRE0 Buzzer (PKM22EPT-CA) 1 AG T1 RTRNPA114DRE0 Transformer 1 AS VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE ZD1 VHEHZ4C3///-1 Zener diode (HZ4C-3) 1 AA 3- 2 FPNLCB454WRK0 Control panel frame with key unit and LCD 1 BC 3- 2-1 FUNTKA957WRE0 Key unit 1 AY 3- 2-2 RLCDSA062DRE0 Liquid crystal display 1 AM 3- 3 QCNC-A012WRE0 Rubber connector 1 AF 3- 4 XEPSD30P08XS0 Screw; Control unit mtg. 4 AA

OVEN PARTS

∆

4- 1 PHOK-A105WRF0 Latch hook 1 AL 4- 2 LANGQA477WRW0 Light mount plate 1 AY 4- 3 PCUSUA502WRP0 Waterproof cushion 1 AD 4- 4 LBNDKA038WRP0 Capacitor holder 1 AF 4- 5 NFANJA029WRE0 Fan blade 1 AK 4- 6 PDUC-A694WRF0 Fan duct 1 AG

∆

4- 7 FOVN-A415WRT0 Oven cavity 1 BL 4- 8 GLEGPA073WRF0 Leg 1 AD 4- 9 LANGTA318WRP0 Chassis support 1 AE 4-10 PCUSGA389WRP0 Cushion 1 AG 4-11 PCOVPA276WRE0 Waveguide cover 1 AM 4-12 PCUSUA500WRP0 Cushion 1 AC 4-13 PPACGA097WRE0 O-ring 1 AG 4-14 PCUSUA443WRP0 Cushion 1 AE

DOOR PARTS

5- 1 FDORFA321WRT0 Door panel 1 AT

∆

5- 2 GWAKPA628WRF0 Door frame 1 AY

∆

5- 3 HPNL-A688WRR0 Door screen 1 AV 5- 4 LSTPPA175WRF0 Latch head 1 AE

∆

5- 5 MSPRTA084WRE0 Latch spring 1 AB 5- 6 PSHEPA622WRE0 Sealer film 1 AG 5- 7 GCOVHA390WRF0 Choke cover 1 AK 5- 8 XCPSD40P08000 Screw : 4mm x 8mm 4 AA

MISCLANEOUS

6- 1 FROLPA090WRK0 Turntable support 1 AQ 6- 2 NTNT-A094WRE0 Turntable 1 AN 6- 3 TINSSA010WRR0 Instruction book 1 AF 6- 4 FW-VZB605WRE0 Switch harness 1 AH 6- 5 FW-VZB688WRE0 Main wire harness 1 AU 6- 6 TCAUAA247WRR0 Argentina caution label for Argentina [R-241CWAA] 1 AD 6- 6 TCAUHA214WRR0 K caution label for Chile [R-241CWAC] 1 AC 6- 6 TCAUHA214WRR0 K caution label for Peru [R-241CWAP] 1 AC 6- 7 TSPCNC800WRR0 Rating label for Argentina [R-241CWAA] 1 AD 6- 7 TSPCNC799WRR0 Rating label for Chile [R-241CWAC] 1 AD 6- 7 TSPCNC801WRR0 Rating label for Peru [R-241CWAP] 1 AD 6- 8 QTANP0020YBE0 Connector 1 AA 6- 9 TLABSA029WRR0 M8A label 1 AC 6-10 TLABSA081WRR0 Argentina label for Argentina [R-241CWAA] 1 AD 6-11 TCAUAA231WRR0 AC cord caution for Argentina [R-241CWAA] 1 AF 6-12 QW-QZA177WRE0 Earth wire for Peru [R-241CWAC] 1 AK

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

6-13 TLABPA032WRR0 Earth label for Peru [R-241CWAC] 1 AG 6-14 TLABSA073WRR0 N label for Argentina [R-241CWAA] 1 AB

SCREWS AND WASHERS

7- 1 XHPSD40P08K00 Screw : 4mm x 8mm for Argentina [R-241CWAA] 7 AA 7- 1 XHPSD40P08K00 Screw : 4mm x 8mm for Chile [R-241CWAP] 7 AA 7- 1 XHPSD40P08K00 Screw : 4mm x 8mm for Peru [R-241CWAP] 6 AA 7- 2 LX-EZA042WRE0 Special screw 2 AB 7- 3 LX-WZA028WRE0 Special washer 1 AB 7- 4 LX-CZA078WRE0 Special screw 4 AC 7- 5 XHTSD40P08RV0 Screw : 4mm x 8mm 5 AA 7- 6 XHPSD30P06000 Screw : 3mm x 6mm 1 AA 7- 7 XOTSD40P12RV0 Screw : 4mm x 12mm 3 AA 7- 8 XOTSD40P12000 Screw : 4mm x 12mm 5 AA 7- 9 XOTSE40P08000 Screw : 4mm x 8mm 4 AA 7-10 LX-CZA076WRE0 Special screw 2 AC 7-11 LX-CZ0052WRE0 Special screw 2 AA 7-12 XHPSD30P10000 Screw : 3mm x 10mm 1 AA

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

R-241CWAA R-241CWAC R-241CWAP

PACKING AND ACCESSORIES

INTO THE  OVEN CAVITY

TRAY PAD ASSY

(CPADBA244WRK0)

DOOR PROTECTION SHEET SPADPA580WRE0

INSTRUCTION BOOK

TURNTABLE TRAY

MICROWAVE OVEN

TURNTABLE SUPPORT

Not replaceable items.

TOP PAD ASSEMBLY FPADBA377WRK0

POLYETHYLENG BAG SSAKHA014WRE0

BOTTOM PAD ASSEMBLY FPADBA378WRK0

PACKING CASE SPAKCD283WRE0 [R-241CWAC]

SPAKCD284WRE0 [R-241CWAA] SPAKCD285WRE0 [R-241CWAP]

R-241CWAA R-241CWAC

R-241CWAP

OVEN AND CABINET PARTS

4-3

4-14

4-7

1-13

4-2

1-4

1-11

6-9

1-9

7-8

7-6

7-8

1-16 1-15

1-17

7-9

7-12

7-1

2-1

7-1

1-8

1-3

for R-241CWAA/CWAC

6-10

1-3

6-11

4-6

6-7

7-4

6-13

6-6

7-4

4-5

7-4

7-9

7-5

7-4

4-11

6-2

6-1

2-2

7-7

4-13

4-12

2-3

7-3

7-1

1-10

7-2

7-11

7-1

1-12

6-4

4-10

4-1

7-10

7-5

6-12

4-8

1-14

1-7

1-1

1-2

1-1

1-5

4-4

7-1

1-6

4-9

7-8

7-7

7-8

2-3

7-10

Before attaching Control unit to Control panel, foil side of Control unit must be cleaned by ethylalcohol.

CONTROL PANEL PARTS

R-241CWAA R-241CWAC R-241CWAP

3-2-1

3-2

3-2-2

3-1

3-3

3-4

5-8

DOOR PARTS

5-6

5-7

5-2

5-3

6-4

5-1

5-5

5-4

MISCELLANEOUS

6-5

5-8

6-8

Actual wire harness may be different than illustration.

R-241CWAA R-241CWAC

R-241CWAP

'99SHARP CORP. (7S0.120E) Printed in U.S.A.

SHARP R241CWA, R-241CWAA, R-241CWAC, R-241CWAP Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual