Sharp R3C59 Schematic

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Info Display

HELP

CONVENIENCE MEALS

Pasta Meal

Frozen Dinner

REHEAT MENU

DINNER

CASSEROLE

PLATE

PIZZA

BEVERAGE

VEGETABLES

RICE

MEAT

EASY DEFROST

12345

6789

LESS

POWER LEVEL

TIMER

CLOCK

AUTO START

STOP

INSTANT COOK

CLEAR

START

R-3C59

SER VICE MANUAL

SX612R3C59PJ/

MICROWAVE OVEN

SOUP

PIE

PASTA



MODEL

R-3C59

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

TABLE OF CONTENTS

Page

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

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

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

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

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

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

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

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

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

TOUCH CONTROL PANEL ............................................................................................................................ 15

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE........................................................... 19

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

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

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

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

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

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

SHARP CORPORATION

R-3C59

SERVICE MANUAL

MICROWAVE OVEN

R-3C59

PRODUCT SPECIFICATIONS

R-3C59

GENERAL IMPORTANT INFORMATION

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

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

CAUTION

MICROWAVE RADIATION

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

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

APPEARANCE VIEW

OPERATING SEQUENCE

FUNCTION OF IMPORTANT COMPONENTS

SERVICING AND TROUBLESHOOTING CHART

TEST PROCEDURE

TOUCH CONTROL PANEL ASSEMBLY

WARNING

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

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

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

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

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

SHARP CORPORATION

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

MICROWAVE MEASUREMENT

WIRING DIAGRAM

PARTS LIST

OSAKA, JAPAN

R-3C59

PRODUCT SPECIFICATIONS

ITEM DESCRIPTION

Power Requirements 230 - 240 Volts

50 Hertz

Single phase, 3 wire earthed Power Consumption 1.5kW Power Output 1000 watts nominal of RF microwave energy (IEC 705)

Operating fequency 2450 MHz

Case Dimensions Width 520 mm

Height 302 mm including foot

Depth 403 mm Cooking Cavity Dimensions Width 348 mm

Height 216.5 mm

Depth 379 mm Turntable diameter 335mm Control Complement Touch Control System

Clock ( 1:00 - 12:59)

Timer (0 - 99 minutes 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

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

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

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

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

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

HELP pad

CONVENIENCE MEALS pads

REHEAT MENU pads

INFORMATION COOK pads

NUMBER pads

POWER LEVEL pad

MORE, LESS pads

TIMER pad

CLOCK pad

AUTO START pad

STOP/CLEAR pad

INSTANT COOK/START pad Set Weight Approx. 17 kg

GENERAL INFORMATION

WARNING

THIS APPLIANCE MUST BE EARTHED

IMPOTANT

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

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

1. Ventilation openings

11 13

Info Display

HELP

CONVENIENCE MEALS

REHEAT MENU

Pasta Meal

Frozen Dinner

DINNER

PLATE

CASSEROLE

SOUP

PIEPIZZA

BEVERAGE

VEGETABLES

RICE / PASTA

MEAT

LESS

TIMER

STOP

CLEAR

INSTANT COOK



START

CLOCK

AUTO START

POWER LEVEL

EASY DEFROST

12 34 5

67 89

CONVENIENCE MEALS PADS Press to select Convenience Meals menu.    NUMBER PADS Press to enter cooking times, clock time, weight or quantity of food.  

MORE ( ), LESS ( ) PADS

 Press to increase/decrease the time in one minute increments during cooking or to alter the doneness for the Convenience Meals or Information Cook modes. 

CLOCK PAD Press to set Clock 

TIMER PAD Press to set Timer.



 STOP/CLEAR PAD

Press to clear during programming. Press once to stop operation of oven during cooking; press twice to cancel cooking programme.

HELP PAD Press to select information guide on and off, child lock or demonstration mode. Press to display preset menu cooking information.   PEHEAT MENU PADS Press to select Reheat Menu.

    INFORMATION COOK PADS Press to select Information Cook mode.  

POWER LEVEL PAD Press to select microwave power setting. If not pressed, HIGH is automatically selected.     AUTO START PAD Press to set Auto Start time.   INSTANT COOK/START PAD Press to start oven after setting programmes. Press once to cook for 1 minute on HIGH or increase in 1 minute increments each time this pad is pressed during cooking.

COOK KG DEF HELP

Indicator

Display

2. Oven lamp

3. Door hinges

4. Door safety latches

5. See through door

6. Door seals and sealing surfaces

7. Coupling

8. Door open button

9. Touch control panel

10.Digital readout

11.Wave guide cover

12.Power supply cord

13.Rating label

14.Turntable tray

15.Turntable support

R-3C59

APPEARANCE VIEW

TOUCH CONTROL PANEL

R-3C59

OPERATION SEQUENCE

OFF CONDITION

Closing the door activates all door interlock switches (1st. latch switch, 2nd. latch switch 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, rated voltage is supplied to the point A3+A5 in the control unit.

Figure O-1 on page 25

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

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 NUMBER pad and start the oven with touching START pad.

Function sequence

Figure O-2 on page 25

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 channeled 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

CONDITION

SWITCH CONTACT COOKING 1st. latch switch COM-NO Closed Open 2nd. latch switch COM-NO Closed Open Monitor switch COM-NC Open Closed Stop switch COM-NO Closed Open

DURING DOOR OPEN

(NO COOKING)

The circuits to the power transformer, fan motor and turntable motor are cut off when the 1st. latch switch, 2nd. latch switch, and stop 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 and 2nd. latch switches.

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

cycle of a cooking program, the 1st. latch switch, 2nd. latch switch and stop 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, 2nd. latch switch and stop switch are closed.

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

the1st. latch switch, 2nd. latch switch remain closed. The fuse M8A will blow, because the monitor switch is closed and a short circuit is caused.

MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING

When the microwave oven is preset for variable cooking power, 230-240 volts A.C. power 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;

32 sec. ON

HIGH

24 sec. ON

MEDIUM HIGH

18 sec. ON

MEDIUM

12 sec. ON

MEDIUM LOW

6 sec. ON

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.

8 sec. OFF

Approx. 70%

14 sec. OFF

Approx. 50%

20 sec. OFF

Approx. 30%

26 sec. OFF

Approx. 10%

FUNCTION OF IMPORTANT COMPONENTS

R-3C59

DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.

Door

Latch Hook 

Latch Heads

Switch Lever

Stop  Switch

2nd. Latch Switch

Monitor  Switch

1st. Latch  Switch

Figure D-1. Door Open Mechanism

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

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

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

MONITOR SWITCH

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

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

3. If the oven door is opened and the contacts (COM-NO) of the 1st. latch switch and 2nd. latch switch fail to open, the fuse M8A blows simultaneously with closing the contacts (COM-NC) of the monitor switch.

CAUTION: BEFORE REPLACING A BLOWN FUSE M8A

TEST THE 1ST. LATCH SWITCH, 2ND. LATCH SWITCH MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OPERATION.

MONITOR RESISTOR R 0.8Ω 20W

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

ASYMMETRIC RECTIFIER

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

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

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

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

3. D2 of the rectifier is shorted.

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

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

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

7. The power supply to all the electrical parts are cut off.

FUSE M8A

1. The fuse M8A blows when the contacts (COM-NO) of the 1st. latch switch and 2nd. latch switch remain closed with the oven door open and when the monitor switch closes.

2. The fuse M8A also blows when asymmetric rectifier, H.V. rectifier, H.V. wire harness, H.V.capacitor, magnetron or secondary winding of power transformer is shorted.

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

OVEN THERMAL CUT-OUT

The thermal cut-out, located on the top of the oven cavity, is designed to prevent damage to the oven by fire. If the foods load is overcooked, by either error in cook time or defect in the control unit, the thermal cut-out will open. Under normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the oven thermal cut-out will open at 125˚C, causing the oven to shut down. The defective thermal cut-out must be replaced with new one.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located near the magnetron is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the magnetron, the thermal cut-out will open at 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.

D2 D1

ASYMMETRIC RECTIFIER

HIGH VOLTAGE  RECTIFIER

TURNTABLE MOTOR

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

R-3C59

FAN MOTOR

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

NOISE FILTER

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

R-3C59

SERVICING

WARNING TO SERVICE PERSONNEL

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

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

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

HIGH-VOLTAGE CAPACITOR

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

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

REMEMBER TO CHECK 4R

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. Check all functions.

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

When all service work is completed, and the oven is fully assembled, the microwave power output should be checked and microwave leakage test 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. latch switch - monitor switch - monitor resistor circuit, check the 1st. latch switch, 2nd. latch switch, monitor switch and monitor resistor before replacing the fuse M8A.

R-3C59

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.

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

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

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

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

Oven lamp does not light (Display appears.)

Fan motor does not operate. (Display appears.)

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

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

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

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

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

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

ABCDEEEEGFH HI KLMN RECKCKRE CK CKCKCK CK J

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

1ST. LATCH SWITCH

2ND. LATCH SWITCH

STOP SWITCH

MONITOR SWITCH

MONITOR RESISTOR

THERMAL CUT-OUT 95˚C /125˚C

FAN MOTOR

TURNTABLE MOTOR

FUSE M8A

TOUCH CONTROL PANEL

KEY UNIT

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

NOISE FILTER

TEST PROCEDURES

R-3C59

PROCEDURE

LETTER

A MAGNETRON TEST

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

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

filament terminals, the meter should show a reading of less than 1 ohm. To test for short 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.......42 sec.

P = 100 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 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.

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

7. The water load must be (1000±5) g.

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

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

Measuring method:

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

2. Add the 1 litre water to the vessel.

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

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

R-3C59

D2 D1

ASYMMETRIC RECTIFIER

HIGH VOLTAGE RECTIFIER

TEST PROCEDURES

PROCEDURE

LETTER

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

Temperature after (42 + 2) = 44 sec................................................................. T2 = 21°C

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

Measured output power

The equation is “P = 100 x ∆T”............................................ P = 100 x 10°C = 1000 Watts

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

CAUTION: 1°C CORRESPONDS TO 100 WATTS REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

1000g

T1˚C

B POWER TRANSFORMER TEST

1000g

COMPONENT TEST

1000g

T2˚C

Heat up for44 sec.

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:

a. Primary winding ................... approx. 1.3 Ω

b. Secondary winding............... approx. 87 Ω

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

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

CARRY OUT 4R CHECKS.

C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST

HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R CHECKS.

ASYMMETRIC RECTIFIER TEST CARRY OUT

Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric can be tested using an ohmmeter set to its highest range across the terminals A+B of the asymmetric rectifier and note

3D CHECKS.

TEST PROCEDURES

R-3C59

PROCEDURE

LETTER

the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both direction then the asymmetric rectifier is good. If an asymmetric rectifier is shorted in either direction, then the asymmetric rectifier is probably faulty and must be replaced with high voltage rectifier. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the power transformer is shorted.

CARRY OUT 4R CHECKS. NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE

MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.

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 10M Ω 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.

COMPONENT TEST

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.

Table: Terminal Connection of Switch

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

Released Open circuit Short circuit NO; Normally open terminal Depressed Short circuit Open circuit NC; Normally close terminal

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch. CARRY OUT 4R CHECKS.

F TEMPERATURE FUSE AND THERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the temperature fuse or thermal cut-out. Then using an

ohmmeter, make a continuity test across the two terminals as described in the table below. CARRY OUT 4R CHECKS.

Table: Temperature fuse and Thermal cut-out Test

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

Thermal cut-out 125˚C This is not resetable type. Above 125˚C Closed circuit. Thermal cut-out 95˚C Below 75˚C Above 95˚C Closed circuit.

Temperature of "ON" condition Temperature of "OFF" condition Indication ofohmmeter

is approx. 20˚C)

If incorrect readings are obtained, replace the temperature fuse or thermal cut-out. An open circuit thermal cut-out 95˚C (MG) indicates that the magnetron has overheated, this may be

due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit. An open circuit thermal cut-out 125˚C (OVEN) indicates that the foods in the oven may catch fire,

R-3C59

WHT

RED

TEST PROCEDURES

PROCEDURE

LETTER

this may be due to over heating produced by improper setting of the cooking time or failure of the control panel.

G 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.

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.

COMPONENT TEST

Table: Resistance of Motor

Motors Resistance Fan motor Approximately 390 Ω Turntable motor Approximately 16.08 kΩ

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

I BLOWN FUSE F M8A

CARRY OUT 3D CHECKS.

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

2. If the fuse M8A is blown when the door is opened, check the 2nd. latch 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.

3. If the fuse M8A is blown, there could be a short in the asymmetric rectifier or there could be a ground in wire harness. A short in the asymmetric rectifier may have occured due to short or ground in H.V. rectifier, magnetron, power transformer or H.V. wire. Check them and replace the defective parts or repair the wire harness.

CARRY OUT 4R CHECKS. CAUTION: ONLY REPLACE FUSE M8A WITH THE CORRECT VALUE REPLACEMENT

J NOISE FILTER TEST

CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the terminals as described in the following table.

MEASURING POINT Between N and L Open circuit

Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit

INDICATION OF OHMMETER

L (min) Cx ± 20% Cy ± 20%

1.0 mH 0.068µF 0.0022µF

TEST PROCEDURES

R-3C59

PROCEDURE

LETTER

If incorrect readings are obtained, replace the noise filter unit. CARRY OUT 4R CHECKS.

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 Liquid crystal display, rubber connector, Control Unit and Key Unit, and troubleshooting by replacement is described according to the symptoms indicated.

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

2. Control Panel. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure L) to determine if control unit is faulty.

2-1 In connection with pads.

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

2-2 In connection with indicators.

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

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

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

COMPONENT TEST

L KEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch 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.

G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8



Pasta

meat

DINNER

PLATE

MEAT

CASSE-

ROLE

VEGETA-

BLES

Frozen

Dinner

BEVER-

AGE

PIE

EASY

DEFROST

RICE/

PASTA

START

HELP

TIMER

STOP

CLEAR

LESS

POWER

LEVEL

CLOCK PIZZA SOUP

INSTANT

COOK

START

09876 54321

AUTO

G 9G10G11G12

R-3C59

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

M RELAY TEST

Remove the outer case and check voltage between Pin No. 3 of the 2-pin connector (A) and the common terminal of the relay RY2 on the control unit with an A.C. voltmeter. The meter should indicate 230 - 240 volts, if not check oven circuit.

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

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

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

control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 APPROX. 13.0V D.C. Oven lamp / Turntable motor / Cooling fan motor RY2 APPROX. 12.0V D.C. Power transformer

CARRY OUT 4R CHECKS.

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

(PWB) IS OPEN

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 OCCURRENCE CAUSE OR CORRECTION

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

Pin No. 3 of the 2-pin connector (A) and the common terminal of the relay RY2.

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

side of low voltage transformer. Check and repair.

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

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

NOTE: *At the time of making these repairs,

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

RY2

FM TTM OL

(J1)

VRS1

POWER

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

R-3C59

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

(1) Key Unit (2) Control Unit

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

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P00, P01, P02, P03, P10, P11, P12 and P13. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through D0, D1, D2 and D3 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, synchronizing signal circuit and back light 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 25 segments and 4 common electrodes using a Liquid Crystal Display.

3) Power Source Circuit

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

Symbol Voltage Application

VC -5V LSI(IC1)

4) Relay Circuit

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

5) Buzzer Circuit

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

6) Synchronizing Signal Circuit

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

7) Door Sensing Switch

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

8) Back Light Switch

A circuit to drive the back light (Light emitting diodes LD1-LD5)

R-3C59

DESCRIPTION OF LSI

LSI(IZA743DR)

The I/O signal of the LSI(IZA743DR) is detailed in the following table.

Pin No. Signal I/O Description

1-5 SEG 4 - OUT Segment data signal.

SEG 0 Connected to LCD.

The relation between signals as follows: LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)

SEG 4 (1).........................5 SEG 16 (53)..................... 25

SEG 3 (2).........................4 SEG 15 (54)..................... 24

SEG 2 (3).........................3 SEG 14 (55)..................... 23

SEG 1 (4).........................2 SEG 13 (56)..................... 22

SEG 0 (5).........................1 SEG 12 (57)..................... 21

SEG 26 (38).......................6 SEG 11 (58)..................... 20

SEG 25 (39).......................7 SEG 10 (59)..................... 19

SEG 24 (40).......................8 SEG 9 (60)..................... 18

SEG 23 (41).......................9 SEG 8 (61)..................... 17

SEG 22 (42).....................10 SEG 7 (62)..................... 16

SEG 21 (43).....................11 SEG 6 (63)..................... 15

SEG 20 (44).....................12 SEG 5 (64)..................... 14

SEG 19 (45).....................13

6 P00 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G1 line keys on key matrix is touched.

7 P01 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G2 line keys on key matrix is touched.

8 P02 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G3 line keys on key matrix is touched.

9 P03 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G4 line keys on key matrix is touched.

10 P10 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G5 line keys on key matrix is touched.

11 P11 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G6 line keys on key matrix is touched.

12 P12 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G7 line keys on key matrix is touched.

13 P13 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to D0-D3 terminal while one of G8 line keys on key matrix is touched.

14 D0 IN Signal coming from touch key.

When either G9 line on key matrix is touched, a corresponding signal out of P00, P03. P10, P11, P12 and P13 will be input into D0. When no key is touched, the signal is held at "H" level.

15 D1 IN Signal similar to D0.

When either G10 line on key matrix is touched, a corresponding signal will be input D0.

16 D2 IN Signal similar to D0.

When either G11 line on key matrix is touched, a corresponding signal will be input D0.

17 D3 IN Signal similar to D0.

When either G12 line on key matrix is touched, a corresponding signal will be input D0.

18 D4 OUT Oven lamp, fan motor and turntable motor driving signal.

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

20.0 msec

During cooking

H : GND

L : -5V

R-3C59

P-HI

H : GND

L : -5V H : GND

L : -5V

P-70

OFF

OFF OFF

24 sec.

8 sec.

0.12 sec.

2.4 sec.

H : GND

L: -5V H : GND

L: -5V

20.0 msec

H : GND

L : -5V

Pin No. Signal I/O Description

19 D5 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.

20 D6 OUT Signal to sound buzzer.

A: key touch sound. B: Completion sound.

21 D7 IN To input signal which communicates the door open/close information to LSI.

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

22 INT0 IN Signal synchronized with commercial power source frequency.

This is basic timing for time processing of LSI.

23 D9 OUT Terminal not used. 24 D10 IN Terminal to change cooking constant according to the Model.

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

25-27 P20-P22 IN Terminal to change cooking constant according to the Model.

By using the A/D converter contained in the LSI, DC voltage in accordance with

Model in operation is applied to set up its cooking constant. 28 P23 IN Connected to VC (-5V). 29 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. 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.

VSS voltage of power source circuit input. 33 VDD IN Power source voltage input terminal.

Connected to GND. 34 XCOUT OUT Terminal not used. 35/36 XCIN/AVSS IN/IN Connected to VC (-5V). 37 VREF IN Power source voltage input terminal.

Standard voltage for LCD. 38-45 SEG 26 - OUT Segment data signal.

SEG 19 Signal similar to SEG 4.

46-48 VLC3-VLC1 IN Power source voltage input terminal.

Standard voltage for LCD. 49 COM3 OUT Common data signal: COM1.

Connected to LCD (Pin No. 29). 50 COM2 OUT Common data signal: COM2.

Connected to LCD (Pin No. 28). 51 COM1 OUT Common data signal: COM1.

Connected to LCD (Pin No. 27). 52 COM0 OUT Common data signal: COM0.

Connected to LCD (Pin No. 26). 53-64 SEG 16 - OUT Segment data signal.

SEG 5 Signal similar to SEG 4.

R-3C59

SERVICING

11.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

2SA933S

KRA101M KRA223M 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 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 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: 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) After aluminium foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.

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

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

R-3C59

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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

operating the oven.

1. CARRY OUT 3D CHECKS.

2. Make sure that a definite” click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click’ as the door switches operate.)

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

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

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

1. Door does not close firmly.

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

3. The door gasket or seal or damaged.

4. The door is bent or warped.

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

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

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

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

3. If the door is not closed.

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

OUTER CASE REMOVAL

To remove the components, procedure as follows.

1. Disconnect oven from power supply.

2. Remove four(4) screws from rear and one (1) screw along the right side edge of case.

3. Slide the entire case back out about 1 inch(3 cm) to free

it from retaining clips on the cavity face plate.

4. Lift entire case from the unit. CAUTION: DISCONNECT OVEN FROM POWER SUP-

PLY BEFORE REMOVING OUTER CASE.

POWER TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS.

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

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

4. Remove transformer from bottom plate right.

Re-install

1. Rest transformer on the bottom plate right with its primary terminals toward the oven face plate.

HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL

1. CARRY OUT 3D CHECKS.

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

3. Disconnect the connector of the main wire harness from the noise filter.

4. Remove one (1) screw holding the noise filter angle to the oven cavity rear plate.

5. Remove one the noise filter angle with noise filter from the oven cavity rear plate.

6. Disconnect the high voltage of the high voltage rectifier assembly from the power transformer.

7. Remove one (1) screw holding capacitor holder to the oven cavity rear plate.

2. Secure transformer with four screws to bottom plate right.

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

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

8. Disconnect rectifier terminal from capacitor. Rectifier and high voltage assembly is now free.

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

10.Disconnect wire leads from capacitor and remove capacitor holder.

11.High voltage rectifier assembly and high voltage capacitor are free now.

CAUTION: WHEN REPLACING HIGH VOLTAGE

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

R-3C59

SCREWS

WAVEGUIDE FLANGE

MAGNETRON

Terminal

Push

Pull down

Lever

Positive lock

connector

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flate type small screw driver

MAGNETRON REMOVAL

Removal

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from magnetron.

3. Remove the two (2) screws holding chassis support to oven cavity front plate and magnetron.

4. Remove the chassis support from oven.

5. Carefully remove the two (2) screws holding magnetron to waveguide flange.

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

7. Now, the magnetron is free.

Re-install

1. Re-install the magnetron to waveguide flange with the two (2) screws diagonally as shown in Figure C-1.

2. Insert the two (2) tabs of the chassis support to the oven cavity front plate and back plate.

3. Re-install the chassis support to oven cavity front plate and magnetron with the two (2) screws.

4. Reconnect the wire leads to the magnetron. Refer to

POSITIVE LOCK® CONNECTOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Pushing the lever of positive lock® connector.

3. Pull out the positive lock® connector.

"PICTORIAL DIAGRAM".

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

CAUTION: WHEN REPLACING MAGNETRON, BE

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

Figure C-1. Magnetron replacement

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).

CONTROL PANEL ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from panel components.

3. Make one (1) tab of the oven cavity front plate straight holding the control panel assembly to the oven flange.

Slide the control panel assembly upward and remove it.

5. Now, individual components can be removed.

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

remaining adhesive on the control panel frame

OVEN LAMP AND LAMP SOCKET REMOVAL

1. CARRY OUT 3D CHECKS.

2. Bend the tab of the partition angle holding the lamp socket.

3. Lift up the oven lamp socket.

4. 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.

5. Now, the oven lamp socket is free.

Figure C-2. Positive lock® connector

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.

Figure C-3. Oven lamp socket

1. Disconnect oven from power supply.

2. Remove turntable and turntable support from oven

TURNTABLE MOTOR REMOVAL

cavity.

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

4. Where the corners have been snipped off bend corner

R-3C59

Shaft

Table

Center of bracket

areas flat. No sharp edge must be evident after removal of the turntable motor cover.

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

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

COOLING FAN MOTOR REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the fan motor.

3. Remove two (2) screws holding the chassis support to magnetron and oven cavity front plate. And remove chassis support.

4. Release the snap of the main wire harness from the fan duct.

5. Remove two (2) screws holding the fan duct assembly to the oven cavity top and front plates.

6. Release the main wire harness from the hole of the fan duct.

7. Release the fan duct from the waveguide flange.

8. Release the fan duct assembly from the oven cavity.

9. Remove the fan blade from the fan motor shaft according the following procedure.

1) Hold the edge of the rotor of the fan motor by using a pair of grove joint pliers.

CAUTION: * Make sure that any pieces do not enter the gap

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

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

because the coil may be cut or injured.

* Do not disfigure the bracket by touching with the

pliers.

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

3) Now, the fan blade will be free.

CAUTION: * Do not reuse the removed fan blade because the

hole (for shaft) may be larger than normal.

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

Coil

7. Now the turntable motor is free.

8. After replacement use the one (1) screw to fit the turntable motor cover.

NOTE: The one (1) screw to fit the turntable motor cover

should be XOTSD40P12000, XOTSD40P10000 or XOTSD40P08000.

11.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 the following procedure.

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

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

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

CAUTION: * Do not hit the fan blade strongly when installed

because the bracket may be disfigured.

* Make sure that the fan blade rotates smooth after

installation.

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

3. Catch three holes of fan duct on three tabs of the waveguide flange.

4. Install the fan duct assembly to the oven cavity top and front plate with the two (2) screws.

5. Insert the snap of the main wire harness to the hole of the fan duct and insert the main wire harness into the hole of the fan duct.

6. Install one (1) tab of the chassis support to oven cavity front plate and install another tab of it to rear plate. And then screw chassis support to magnetron and oven cavity front plate with two (2) screws.

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

Groove joint pliers

Stator

Gap Bracket

Rotor

Shaft

Axis

Stator

Rotor

Side ViewRear View

POWER SUPPLY CORD REPLACEMENT

Removal

1. CARRY OUT 3D CHECKS.

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

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

These are the position where should be pinched with pliers

4. Remove the power supply cord from the oven cavity back plate.

Re-install

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

R-3C59

Latch Hook 

2nd. Latch Switch

Monitor  Switch

Stop  Switch

Switch Lever

Latch Heads

Door

1st. Latch  Switch

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

3. Re-install the earth wire to bottom plate with one (1)

Blue wire

Brown wire

Power supply  cord

screw.

4. CARRY OUT 4R CHECKS.

Noise  filter

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

after replacing power supply cord.

Green/Yellow wire

Figure C-4. Power supply cord replacement

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

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from the switches.

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

4. Remove latch hook assembly from oven flange.

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

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

Re-install

1. Re-install each switch lever and latch switch in its place. The 1st. latch /stop/monitor switches are in the lower position and the 2nd. latch switch is in the upper position.

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

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

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

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

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

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

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

3. Secure the screws with washers firmly.

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

After adjustment, check the following.

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

REMOVAL

DOOR REPLACEMENT

1. Disconnect oven from power supply.

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

3. Insert an putty knife (thickness of about 0.5mm) into the gap between the door stopper and the choke cover to

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

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

3. Monitor switch contacts close when door is opened.

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

Figure C-5. Latch Switch Adjustments

free engaging parts as shown in Figure C-6.

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

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

6. Insert an putty knife (thickness of about 0.5mm) into the

R-3C59

Upper oven hinge

Lower  oven hinge

Lower oven hinge

Door stopper

Choke cover

Door panel

Sealer film

Backing film

Adhesive tape

gap between the choke cover and door frame as shown in Figure C-6 to free engaging parts.

7. Try the principles of the lever and lift up the choke cover by inserting a putty knife as shown Figure C-6.

8. Release choke cover from door panel.

9. Now choke cover is free.

Door stopper

Choke Cover

Door Frame

Putty Knife

Figure C-6. Door Disassembly

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

11.Now, door panel with door frame is free from oven cavity.

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

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

14.Tear sealer film from door panel.

15.Now, door panel is free.

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

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

18.Remove door screen from door frame by releasing two (2) tabs.

19.Now, door screen is free.

RE-INSTALL

1. Re-install door screen to door frame by fitting two (2) tabs of door frame to two (2) holes of door screen.

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

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

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

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

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

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

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

Note: After any service to the door; (A) Make sure that door sensing switch and secondary

interlock switch are operating properly. (Refer to chapter “Test Procedures”.).

(B) An approved microwave survey meter should be

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

After any service, make sure of the following :

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

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

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

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

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

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

Figure C-7. Door Replacement

SEALER FILM

Installation

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

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

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

Figure C-8. Sealer film

R-3C59

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

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

THERMAL

CUT-OUT

125˚C (OVEN)

2ND.

LATCH

SWITCH

R-3C59

FUSE

BRN

M8A

230-240V/50Hz

0.068µ/AC250V

LINE CROSS CAPACITOR

NOISE SUPPRESSION COIL

BLU

G-Y

EARTH

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. START KEY TOUCHED

LATCH

SWITCH

N.O.

RY-2

STOP

SWITCH

CONTROL

UNIT

RY-1

OVEN LAMP

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

THERMAL 

CUT-OUT

95˚C (MG)

COM.

1ST.

Figure O-1. Oven Schematic-OFF Condition

FAN MOTOR

TTM

MONITOR

RESISTOR

0.8/20W

MONITOR SWITCH

TURNTABLE MOTOR

POWER TRANSFORMER

CAPACITOR

1.07µ

AC2200V

ASYMMETRIC

RECTIFIER

MAGNETRON

H.V. RECTIFIER

BRN

230-240V/50Hz

G-Y

EARTH

BLU

THERMAL

CUT-OUT

125˚C (OVEN)

FUSE

M8A

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

0.068µ/AC250V

LINE CROSS CAPACITOR

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

THERMAL 

CUT-OUT

95˚C (MG)

COM.

1ST.

LATCH

SWITCH

STOP

N.O.

RY-2

CONTROL

SWITCH

UNIT

2ND.

RY-1

LATCH

SWITCH

OVEN LAMP

FAN MOTOR

TTM

MONITOR

RESISTOR

0.8/20W

MONITOR SWITCH

TURNTABLE MOTOR

POWER TRANSFORMER

CAPACITOR

1.07µ

AC2200V

ASYMMETRIC

RECTIFIER

MAGNETRON

H.V. RECTIFIER

Figure O-2. Oven Schematic-Cooking Condition

R-3C59

BLACK MARK

WHT

RED

OVEN LAMP 

AND SOCKET

NOTE:

Neutral (WHT) wire must

be connected to the

terminal with black mark

on the oven light socket.

MAGNETRON

THERMAL 

CUT-OUT

95˚C (MG)

HIGH VOLTAGE COMPONENTS

WHT

RECTIFIER H.V.

RECTIFIER ASYMMETRIC

HIGH 

VOLTAGE

WIRE A

HIGH 

VOLTAGE

CAPACITOR

BLK

WHT

HIGH VOLTAGE

TRANSFORMER

POWER

SUPPLY

CORD

NEUTRAL

M8A

BLU

BRN

G

LIVE

EARTH

/

NOISE FILTER

RED

WHT

BLK

RED

2ND

THERMAL CUT-OUT

125˚C (OVEN)

BLK

RED

N.O.

COM.

LACTH

SWITCH

BLK

RED

FAN MOTOR

GRY

GRN

CN-B

BLK

GRN

GRY

GRN

WHT

CN-A

WHT 3

ORG 112

GRY

WHT

N.C.

GRY

COM.

GRY

ORG

TURNTABLE

MONITOR

SWITCH

BLK

MOTOR

GRY

STOP

SWITCH

GRN

COM.

WHT

GRY

MONITOR

WHT

1ST 

LATCH

SWITCH

BLK

RESISTOR

WHT

GRY

COM.

(OVEN SIDE)

Figure S-1. Pictorial Diagram

CONTROL UNIT

CN-G

CN-B

LSI

N.O.

CN-A

COM.

BLK

RED

RY2

RY1

R-3C59

LIQUID CRYSTAL DISPLAY



D1

S1NB10

CONTROL UNIT

R5 10k

R6 10k

COOK SENSOR LBS KG DEF HELP

AC230-240V

50Hz

A 3

10G471K

VRS1

(J1)



C1 0.1µ 50v C2 470µ 25v

–

1k R2

HZ4C3 ZD1

C6

R1 560 1/2w

R3 4.7k

Q1

2SA933

R4 10k

(C8) 100µ 16v

–

C4 47µ 16v

–

C5 0.1µ 50v

3332

VDD

XCOUT

XCIN

AVSS VREF

SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20

SEG19 VLC3 VLC2 VLC1 COM3 COM2 COM1 COM0

SEG16

SEG15

SEG14

SEG13

IC1 IZA743DR

SEG12

SEG11

SEG10 SEG9 SEG8 SEG7 SEG6 SEG5

IF NOT SPECIFIED, 1/4w ± 5%

IF NOT SPECIFIED, 1SS270A

IF NOT SPECIFIED, 0.01µ 16v

(NOTE)

0.1µ 50v

CF1

XIN P23

P22 P21 P20 D10

D9 D7

D6 D5 D4 D3 D2 D1 D0

P13 P12 P11 P10 P03 P02 P01 P00



VSS

XOUT

RESET

INT0

SEG0 SEG1 SEG2 SEG3 SEG4

TURNTABLE

MOTOR

FAN MOTOR

OVEN LAMP

A 1

RY1

D20D21

Q21

KRC243M

(R10) 150

Q2

KRA101M

–

Q20

KRA101M

–

C21

(R11) 47

10µ 35v

R20 4.7k

C20 0.1µ 50v

R30 4.7k

R7 4.7k

C30



4MHz

R8 4.7k

(J9) (J7) (J5) (J3)

(J8) (J6) (J4) (J2)

C63 330P C62 330P C61 330P

G 9G10G11G12

R67 15k

09876

R66 15k

R65 15k

R64 15k

R63 15k

R62 15k

meal

Pasta

R61 15k

R60 15k

G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8

HELP LESS

DOOR

D30

R68 15k

54321

PLATE

DINNER

LEVEL

POWER

TIMER

SWITCH

RY2

D22

R31 15k

R69 15k

EASY

DEFROST

SOUP

Dinner

Frozen

ROLE

CASSE-

CLOCK PIZZA

STOP

CLEAR

COM

Q22

R71 15k

R70 15k

AUTO

START

RICE/ 

PASTA

PIE



AGE

BEVER-

BLES

VEGETA-

MEAT



COOK

START

INSTANT

MICRO

KRA223M

R40 3.3k

SP40

Q40

KRA101M

D51D50

R50 27

Q50

4.7k

2SA933

R51

R75 100k R74 100k R73 100k R72 100k C60 330P

WH-A

LD1 LD2 LD3 LD4 LD5

(LIGHT EMITTING DIODES)

BACK LIGHT

KEY UNIT

Figure S-2. Control Panel Circuit

R-3C59

(1 2)

LOT. NO.

CN - G

C63

(WH - A)

LD5

R61

R60

132

R62

R63 R64

R65 R66

IC1

R67

R68

R69

R70

R71

R72

R73

C60

C61

R74

R75

C62

LD4 LD3 LD2 LD1

BFB

SATL

QKITPB020

64 33

MRE0

4 5

(C8)

1 2

SMCA

Q50

R50

Q40

SN - A

GREEN

SN - B

D22

WH - A

Q51

D51

D30

R51

D50

R52

SP40

R40

CN - B

WH - A

D20

(J8)

(R11)

RY1

(J6)

ZD1

(J4)

C21

(J2)

(J3)

(J5)

Q21

RY2

(J9)

(J7)

CF1

FM TTM OL

R20 E

(OMIF)

DU12D1

12 13

C20

Q20

(R10)

D21

POWER

C30

(J1)

VRS1

Q22

R30

R31

Figure S-3. Printed Wiring Board

PARTS LIST

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

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

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

ELECTRIC PARTS

1- 1 QSW-MA110WRE0 1st. latch switch, 2nd. latch switch and stop switch 3 AK 1- 2 QSW-MA111WRE0 Monitor switch 1 AK 1- 3 FPWBFA306WRK0 Noise filter 1 AT 1- 4 RTHM-A078WRE0 Thermal cut-out 125˚C. 1 AL 1- 5 QACCAA045WRE0 Power supply cord 1 AT 1- 6 FH-DZA065WRK0 High voltage rectifier assembly 1 AX

1- 7 RC-QZA182WRE0 High voltage capacitor 1 AY

∆

1- 8 RV-MZA197WRE0 Magnetron 1 BN

1- 9 RMOTEA340WRE0 Fan motor 1 AX 1-10 QSOCLA022WRE0 Oven lamp socket 1 AG 1-11 RLMPTA069WRE0 Oven lamp 1 AK 1-12 RMOTDA169WRE0 Turntable motor 1 AW 1-13 RTHM-A079WRE0 Thermal cut-out 95 deg. 1 AL 1-14 RTRN-A511WRE0 Power transformer 1 BP

1-15 QFS-CA010WRE0 Fuse M8A 1 AE 1-16 RR-WZA022WRE0 Monitor resistor 0.8Ω 20w 1 AK

CABINET PARTS

2- 1 GCABUA584WRT0 Outer case cabnet 1 BB 2- 2 GDAI-A261WRW0 Bottom plate left 1 AP 2- 3 GDAI-A286WRW0 Bottom plate right 1 AN 2- 4 GLEGPA023WRE0 Foot 2 AB 2- 5 GLEGPA067WRE0 Foot 1 AE

CONTROL PANEL PARTS

3- 1 CPWBFA717WRK0 Control unit (New Zealand only) 1 BG 3- 1A QCNCMA394DRE0 2-pin connector (CN-A) 1 AD 3- 1B QCNCWA057DRE0 12-pin connector (CN-G) 1 AF 3- 1C QCNCMA275DRE0 2-pin connector (CN-B) 1 AB 3- 1D FW-VZA196DRE0 2-pin harness (WH-A) 1 AD 3- 1E LHLD-A164WRF0 LED holder 1 AD C1 RC-KZA087DRE0 Capacitor 0.1uF 50V 1 AB C2 VCEAB31EW477M Capacitor 470uF 25V 1 AC C3 VCKYD11CY103N Capacitor 0.01uF 16V 1 AH C4 VCEAB31CW476M Capacitor 47uF 16V 1 AA C5-6 RC-KZA087DRE0 Capacitor 0.1uF 50V 2 AB C7 VCKYD11CY103N Capacitor 0.01uF 16V 1 AH (C8) VCEAB31CW107M Capacitor 100uF 16V 1 AB C20 VCEAB31HW104M Capacitor 0.1uF 50V 1 AB C21 VCEAB31VW106M Capacitor 10uF 35V 1 AB C30 VCKYD11CY103N Capacitor 0.01uF 16V 1 AH C60-63 VCKYD11HB331K Capacitor 330pF 50V 4 AA CF1 RCRS-A012DRE0 Ceramic resonator (CST4.00MGW) 1 AD D1 RSRCDA013DRE0 Diode bridge (S1NB10) 1 AG D20-22 VHD1SS270A/-1 Diode (1SS270ATA) 3 AA D30 VHD1SS270A/-1 Diode (1SS270ATA) 1 AA D50-51 VHD1SS270A/-1 Diode (1SS270ATA) 2 AA IC1 RH-IZA743DRE0 LSI 1 AS LD1-5 VHPSLZ381A9-3 Light emitting diode 5 AC Q1 VS2SA933S//-3 Transistor (2SA933) 1 AB Q2 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q20 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q21 VSKRC243M//-3 Transistor (KRC243M) 1 AB Q22 VSKRA223M//-3 Transistor (KRA223M) 1 AB Q40 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q50 VS2SA933S//-3 Transistor (2SA933) 1 AB R1 VRD-B12HF561J Resistor 560 ohm 1/2W 1 AA R2 VRD-B12EF102J Resistor 1.0k ohm 1/4W 1 AA R3 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R4-6 VRD-B12EF103J Resistor 10k ohm 1/4W 3 AA R7-8 VRD-B12EF472J Resistor 4.7k ohm 1/4W 2 AA (R10) VRD-B12EF151J Resistor 150 ohm 1/4W 1 AA (R11) VRD-B12EF470J Resistor 47 ohm 1/4W 1 AB R20 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R30 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R31 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA R40 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA R50 VRD-B12EF270J Resistor 27 ohm 1/4W 1 AB R51 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R60-71 VRD-B12EF153J Resistor 15k ohm 1/4W 12 AA

R-3C59

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

R72-75 VRD-B12EF104J Resistor 100k ohm 1/4W 4 AA RY1 RRLY-A021DRE0 Relay (OJSH112LM-UL) 1 AH RY2 RRLY-A094DRE0 Relay (OMIF-S-112LM) 1 AN SP40 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG T1 RTRNPA108DRE0 Transformer 1 AR VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE ZD1 VHEHZ4C3///-1 Zener diode (HZ4C-3) 1 AA 3- 2 FPNLCB268WRK0 Control panel frame with key unit 1 BB 3- 2- 1 FUNTKA787WRE0 Key unit 1 AX 3- 3 PSHEPA585WRE0 LED sheet 1 AM 3- 4 QCNC-A007WRE0 Rubber connector 1 AE 3- 5 RLCDSA039DRE0 Liquid crystal display 1 AN 3- 6 JBTN-B029WRF0 Open button 1 AG 3- 7 MSPRCA050WRE0 Open button spring 1 AB 3- 8 XEPSD30P08XS0 Screw: 3mm x 8mm 4 AA

OVEN PARTS

4- 1 LANGQA456WRP0 Noise filter angle 1 AG 4- 2 PCUSGA312WRP0 Cushion 1 AB 4- 3 PHOK-A095WRF0 Latch hook 1 AN

∆

4- 4 LBNDKA099WRW0 Capacitor holder 1 AD 4- 5 NFANJA029WRE0 Fan blade 1 AL 4- 6 PDUC-A652WRP0 Fan duct 1 AU 4- 7 FOVN-A375WRT0 Oven cavity 1 BH

∆

4- 8 LANGFA180WRW0 Chassis support 1 AM 4- 9 LANGQA452WRP0 Partition angle 1 AK 4-10 LANGQA454WRP0 MG thermo angle 1 AH 4-11 MLEVPA194WRF0 Switch lever 1 AG 4-12 NCPL-A045WRF0 Coupling 1 AH 4-13 PSPAJA004WRF0 Spacer 1 AD 4-14 PCOVPA275WRE0 Waveguide cover 1 AR 4-15 PCUSGA339WRP0 Cushion 1 AG 4-16 PCUSUA212WRP0 Cushion 1 AB 4-17 PCUSUA235WRP0 Cushion 1 AF 4-18 PCUSUA376WRP0 Cushion 1 AG 4-19 PPACGA084WRF0 TTM packing 1 AF 4-20 PGIDHA058WRP0 MG. air guide 1 AF

4-21 LSTPPA162WRF0 Door stopper 1 AE

DOOR PARTS

∆

5- 1 FDORFA303WRT0 Door panel 1 BA 5- 2 PSHEPA382WRE0 Sealer film 1 AH 5- 3 GWAKPA458WRR0 Door frame 1 AY 5- 4 HPNL-A662WRE0 Door screen 1 AK

5- 5 GCOVHA370WRF0 Choke cover 1 AM 5- 6 LSTPPA139WRF0 Latch head 1 AF

∆

5- 7 MSPRTA084WRE0 Latch spring 1 AB 5- 8 PCUSUA481WRP0 Cushion 1 AB 5- 9 XCPSD40P08000 Screw : 4mm x 8mm 2 AA

MISCELLANEOUS

6- 1 FROLPA073WRK0 Turntable support 1 AP 6- 2 NTNT-A079WRE0 Turntable tray 1 AR 6- 3 FW-VZB556WRE0 Main wire harness 1 AW 6- 4 QW-QZA220WRE0 High voltage wire A 1 AH

6- 5 FW-VZB122WRE0 Switch harness 1 AP 6- 6 LHLDWA011WRE0 Purse lock M 1 AB 6- 7 TCAUHA214WRR0 Caution label 1 AC 6- 8 TINSEA689WRR0 Instruction book 1 AP 6- 9 TSPCNC392WRR0 Rating label 1 AD 6-10 TLABMA535WRR0 Menu label 1 AD

SCREWS,NUTS AND WASHERS

7- 1 XFPSD40P08K00 Screw : 4mm x 8mm 10 AA 7- 2 XFPSD30P06000 Screw : 3mm x 6mm 1 AA 7- 3 XHTSD40P08RV0 Screw : 4mm x 8mm 7 AA 7- 4 LX-CZA060WRE0 Special screw : 4mm x 12mm 1 AG 7- 5 XOTSD40P12RV0 Screw : 4mm x 12mm 14 AA 7- 6 XOTSD40P12000 Screw : 4mm x 12mm 7 AA 7- 7 XOTSE40P08000 Screw : 4mm x 8mm 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

SERVICE INFORMATION

The following parts will be changed from Dec./ 1996 or Jan./ 1997 productions.

Interchangeability

OLD NEWA. OLD NEWB. OLD NEWC. OLD NEWD.

R-3C59

INTERCHANGEABILITY

CODE

EFFEC TIVE FROM

REF.NO.

REPLACEMENT PART NO.

DESCRIPTION OLD No. Q'ty NEW No. Q'ty

1- 7 High voltage capacitor RC-QZA182WRE0 1 RC-QZA215WRE0 1 A AY Dec./ 1996 2- 1 6- 1 6- 2

Outer case cabinet Turntable support Turntable tray

GCABUA584WRT0 1 GCABUA608WRP0 1 A BB Jan./ 1997 FROLPA073WRK0 1 FROLPA079WRK0 1 A AQ Jan./ 1997 NTNT-A079WRE0 1 NTNT-A084WRE0 1 A AR Jan./ 1997

PACKING AND ACCESSORIES

TOP PAD ASSEMBLY FPADBA311WRK0

DOOR PROTECTION SHEET SPADPA204WRE0

INTO THE OVEN CAVITY

PRINTING MATTER

6- 2 TURNTABLE TRAY

6- 1 TURNTABLE SUPPORT

Not replaceable items.

PLASTIC BAG SSAKHA034WRE0



BOTTOM PAD ASSEMBLY FPADBA351WRK0

TRAY PACK SPADFA397WRE0

PACKING CASE SPAKCC843WRE0

R-3C59

OVEN AND CABINET PARTS

4-17

4-18

1-11

4-9

1-10

1-4

7-2

2-1

7-5

7-3

4-10

1-13

4-19

4-16

7-1

1-8

6-7

7-5

7-7

4-7

6-10

4-12

4-14

7-3

2-2

2-4

7-6

2-5

7-6

1-12

7-6

6-5

4-19

7-1

7-3

1-16

7-5

4-11

7-5

2-4

7-1

7-5

1-1

4-15

7-5

4-2

4-3

1-14

2-3

7-5

1-1

7-1

4-15

7-6

6-1

1-2

1-6

1-9

7-6

1-5

7-3

7-1

4-13

4-4

7-1

7-4

1-5

1-7

4-5

4-20

4-6

4-1

7-3

4-8

6-2

7-6

1-15

1-3

7-3

7-1

R-3C59

CONTROL PANEL PARTS

3 - 2

6 - 9

3-2-1

3 - 1

3 - 3

3 - 5

3-1E

3 - 4

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

DOOR PARTS

5-5

3 - 8

4-21

3 - 6

6-3

3 - 7

5-3

5-4

5-8

5-1

MISCELLANEOUS

6-4

5-7

5-9

5-2

5-6

(CAPACITOR)

Actual wire harness may be different from illustration.

R-3C59

'96SHARP CORP. (11K0.820E) Printed in Australia

Sharp R3C59 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual