SHARP R-1210, R-1211 Service Manual

SERVICE MANUAL

S2203R1510X//

OVER THE COUNTER

MICROWAVE OVEN

R-1210
R-1211

MODELS

SENSOR

R-1210
R-1211

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

WARNING TO SERVICE PERSONNEL: Microwave ovens con­tain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a
severe, possibly fatal, electrical shock. (High Voltage Capaci­tor, High Voltage Power Transformer, Magnetron, High Volt­age Rectifier Assembly, High Voltage Harness etc..)

This is a supplemental Service Manual for Models R-1210 and R-1211. These models are quite similar to base model
R-1200 and R-1201. Use this supplemental manual together with the Base Models Service Manual (Reference No.
is SY130R1200X//) for complete operation, service information, etc..

TABLE OF CONTENTS

Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER

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

WARNING TO SERVICE PERSONNEL................................................................................................................1

MICROWAVE MEASUREMENT PROCEDURE ...................................................................................................2

FOREWORD AND WARNING...............................................................................................................................3

PRODUCT SPECIFICATIONS ..............................................................................................................................4

CONTROL PANEL.................................................................................................................................................4

OPERATION..........................................................................................................................................................5

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

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

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

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................20

PICTORIAL DIAGRAM ........................................................................................................................................24

POWER UNIT CIRCUIT ......................................................................................................................................25

LSI UNIT CIRCUIT...............................................................................................................................................26

PRINTED WIRING BOARD .................................................................................................................................27

PARTS LIST ........................................................................................................................................................28

PACKING AND ACCESSORIES .........................................................................................................................33

SHARP CORPORATION

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.

35

R-1210
R-1211

PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO­SURE TO EXCESSIVE MICROWAVE ENERGY

(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal
and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches,
(5) evidence of dropping or abuse.

(c) Before turning on microwave power for any service test or inspection within the microwave generating

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation

and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.

(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be

performed on each oven prior to release to the owner.

BEFORE SERVICING

Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.

If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.

Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit
found with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use
the unit until the oven has been brought into compliance.

36

W ARNING TO SER VICE PERSONNEL

Microwave ovens contain circuitry capable of pro­ducing very high voltage and current, contact with
following parts
fatal, electrical shock.

(Example)
High Voltage Capacitor, High Voltage Power Trans-

former, Magnetron, High Voltage Rectifier Assem­bly, High Voltage Harness etc..

Read the Service Manual carefully and follow all
instructions.

may result in a severe, possibly

Don't Touch !
Danger High Voltage

R-1210
R-1211

Before Servicing

1. Disconnect the power supply cord , and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

WARNING:RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.

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 high­voltage capacitor (that is the connecting lead of the high­voltage rectifier) against the chassis with the use of an
insulated screwdriver.

Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event,

1. Disconnect the power supply cord, and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the leads to the primary of the power
transformer.

5. Ensure that these leads remain isolated from other
components and oven chassis by using insulation tape.

6. After that procedure, reconnect the power supply cord.

When the testing is completed,

1. Disconnect the power supply cord, and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power
transformer.

5. Reinstall the outer case (cabinet).

6. Reconnect the power supply cord after the outer case is
installed.

7. Run the oven and check all functions.

After repairing

1. Reconnect all leads removed from components during
testing.

2. Reinstall the outer case (cabinet).

3. Reconnect the power supply cord after the outer case is
installed.

4. Run the oven and 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 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 Before Servicing procedure and re­examine the connections to the component being tested.

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

1

R-1210
R-1211

MICROW A VE MEASUREMENT PROCEDURE

A. Requirements:

1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.

2) Safety interlock switches: Primary interlock switch shall prevent microwave radiation emission in excess of the
requirement as above mentioned, secondary interlock relay and door sensing switch shall prevent microwave radiation
emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:

1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:

Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.

2) Place the oven tray in the oven cavity.

3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive 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) Set the cooking control on Full Power Cooking Mode

5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.

C. Leakage test:

Closed-door leakage test (microwave measurement)

1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.

2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.

3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.

4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the primary interlock switch and the secondary interlock relay do turn the oven OFF before any door movement.

NOTE: After servicing, record data on service invoice and microwave leakage report.

2

R-1210
R-1211

SERVICE MANUAL

OVER THE COUNTER

MICROWAVE OVEN

R-1210/ R-1211

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service
Information for the SHARP OVER THE COUNTER MICROWAVE OVEN, R-1210 and R-1211.

The models R-1210 and R-1211 are quite similar to base models R-1200 and R-1201 (Reference No. is SY130R1200X//).
It is recommended that service personnel carefully study the entire text of this manual and base model service manual so

that they will be qualified to render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and

microwave radiation hazard.

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 personnel.

DANGER

Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing.
Service personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage
Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.

All the parts marked “*” on parts list are used at voltages more than 250V.
Removal of the outer wrap gives access to voltage 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 ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

3

R-1210
R-1211

PRODUCT SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts / 14.1 Amperes

60 Hertz
Single phase, 3 wire grounded

Power Output 1100 watts (IEC TEST PROCEDURE)

Operating frequency of 2450MHz

Case Dimensions Width 23-7/8"

Height 14-1/16"
Depth 15- 9/16"

Cooking Cavity Dimensions Width 17-1/2"

Height 9-7/8"

1.5 Cubic Feet Depth 14-15/16"
Hood lamp 2 bulbs, 20W x 2, Incandescent light bulbs
Control Complement Touch Control System

Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking
Repetition Rate;

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

P-90 ....................................................................approx. 90% of Full Power

P-80 ....................................................................approx. 80% of Full Power

P-70 ....................................................................approx. 70% of Full Power

P-60 ....................................................................approx. 60% of Full Power

P-50 ....................................................................approx. 50% of Full Power

P-40 ....................................................................approx. 40% of Full Power

P-30 ....................................................................approx. 30% of Full Power

P-20 ....................................................................approx. 20% of Full Power

P-10 ....................................................................approx. 10% of Full Power

P-0 .................................................... No power throughout the cooking time

CUSTOM HELP pad, KEEP WARM PLUS pad
ACCENT LIGHT pad, TASK LIGHT pad, REHEAT pads
SENSOR COOK CENTER pad DEFROST CENTER pad
INSTANT SENSOR pads, Number selection pads
POWER LEVEL pad, TIMER / CLOCK pad

STOP/CLEAR pad, START/MINUTE PLUS pad
Oven Cavity Light 20W x 1 Incandescent light bulb
Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Weight Approx. 50 lbs.

CONTROL PANEL

KEEP

CUSTOM

WARM PLUS

HELP

ACCENT

TASK

LIGHT

LIGHT

NOTE: Some one-touch cooking features such as "MINUTE PLUS" are disabled after three minutes when the oven

is not used. These features are automatically enabled when the door is opened and closed or STOP/CLEAR
button is pressed.

REHEAT

FRESH ROLLS/

MUFFINS

BEVERAGE

FROZEN ROLLS/

MUFFINS

HOT

WATER

SENSOR

COOK CENTER

DEFROST

CENTER

POPCORN

BAKED

POTATOES

SENSOR
REHEAT

FRESH

VEGETABLES

COOK SENSOR LBS DEF HELP

WATTS

1100

12345

67890

POWER

LEVEL

STOP

CLEAR

TIMER

CLOCK

START

MINUTE PLUS

4

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

R-1210
R-1211

The following is a description of component functions during
oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and
primary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).

1. The display will show "SHARP SIMPLY THE BEST
PRESS CLEAR AND PRESS CLOCK".
To set any program or set the clock, you must first touch
the STOP/CLEAR button. The display will clear, and " :
" will appear .

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 120
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY2) which is operated by the
control unit within an interval second time base.
Microwave power operation is as follows:

VARI-MODE ON TIME OFF TIME

HIGH (100% power) 32 sec. 0 sec.
P-90 (approx. 90% power) 30 sec. 2 sec.
P-80 (approx. 80% power) 26 sec. 6 sec.

P-70 (approx. 70% power) 24 sec. 8 sec.
P-60 (approx. 60% power) 22 sec. 10 sec.
P-50 (approx. 50% power) 18 sec. 14 sec.
P-40 (approx. 40% power) 16 sec. 16 sec.
P-30 (approx. 30% power) 12 sec. 20 sec.
P-20 (approx. 20% power) 8 sec. 24 sec.
P-10 (approx. 10% power) 6 sec. 26 sec.
P-0 (0% power) 0 sec. 32 sec.

Note: The ON/OFF time ratio does not correspond with

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

SENSOR COOKING CONDITION

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

An example of how sensor works (Baked potatoes):

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

MICROWAVE

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

AH SENSOR

MICROWAVE

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

Cooking Sequence.

1. Operate the oven in sensor cooking mode by referring to
operation manual.

NOTE: The oven should not be operated on Sensor Cooking

immediately after plugging in the unit. Wait two
minutes before cooking on Sensor Cooking.

2. The coil of shut-off relay (RY1) is energized, the oven
lamp, turntable motor and cooling fan motor are turned
on, but the power transformer is not turned on.

3. After about 16 seconds, the cook relay (RY2) is energized.
The power transformer is turned on, microwave energy
is produced and first stage is started.
The 16 seconds is the cooling time required to remove
any vapor from the oven cavity and sensor.

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

STOP/CLEAR pad.

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

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

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

5

R-1210
R-1211

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

FUSE
20A

120 V AC.
60 Hz

CAVITY
TEMPERATURE FUSE

BLKWHT

GRN

GND

A1

MAGNETRON
TEMPERATURE FUSE

RY3

RY4

A3 A5

HOOD
LAMP

HL

CONTROL UNIT

HL

OVEN LAMP
RELAY

RY1

N.O.

N.O.

COM.

OL

RY2

SECONDARY
INTERLOCK
RELAY

OVEN LAMP

PRIMARY
INTERLOCK
SWITCH

TTM

Figure O-1. Oven Schematic-Off Condition

COM.

F1
F2

F3

B1

DOOR
SENSING
SWITCH

B2

FM

TURNTABLE

MOTOR

FAN

MOTOR

AH SENSOR

MONITOR

SWITCH

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

POWER
TRANSFORMER

HIGH VOLTAGE
CAPACITOR

1.0µF/ AC2300V

HIGH VOLTAGE
RECTIFIER

MAGNETRON

FUSE
20A

120 V AC.
60 Hz

CAVITY
TEMPERATURE FUSE

BLKWHT

GRN

GND

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. VARIABLE COOKING CONTROL "HIGH".

4. "START" BUTTON PRESSED.

MAGNETRON
TEMPERATURE FUSE

A1

RY3

RY4

A3 A5

HOOD
LAMP

HL

CONTROL UNIT

HL

OVEN LAMP
RELAY

RY1

N.O.

N.O.

COM.

OL

RY2

SECONDARY
INTERLOCK
RELAY

OVEN LAMP

COM.

TTM

B1

B2

F1
F2

F3

FM

TURNTABLE

MOTOR

DOOR
SENSING
SWITCH

FAN

MOTOR

AH SENSOR

MONITOR

SWITCH

POWER
TRANSFORMER

HIGH VOLTAGE
CAPACITOR

1.0µF/ AC2300V

HIGH VOLTAGE
RECTIFIER

MAGNETRON

PRIMARY
INTERLOCK
SWITCH

Figure O-2. Oven Schematic-Cooking Condition

6

R-1210
R-1211

TROUBLESHOOTING GUIDE

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.

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 moni­tor fuse, check the monitor switch, relay (RY1) secondary
interlock relay (RY2), door sensing switch and primary
interlock switch before replacing the monitor fuse. If monitor
fuse is replaced, the monitor switch must also be replaced.
Use part FFS-BA016/KiT as an assembly.

IMPORTANT:

Whenever troubleshooting is performed with the power
supply cord disconnected. It may in, some cases, be neces­sary to connect the power supply cord after the outer case
has been removed, in this event,

1. Disconnect the power supply cord, and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

TEST PROCEDURE

4. Disconnect the leads to the primary of the power
transformer.

5. Ensure that the leads remain isolated from other
components and oven chassis by using insulation tape.

6. After that procedure, reconnect the power supply cord.

When the testing is completed

1. Disconnect the power supply cord, and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power
transformer.

5. Reinstall the outer case (cabinet).

6. Reconnect the power supply cord after the outer case is
installed.

7. Run the oven and check all functions.

JOCK

CONDITION

SENSOR
COOKING
CONDITION

POSSIBLE CAUSE

DEFECTIVE PARTS

PROBLEM

The oven stops and "ERROR" is displayed or does not end during Sensor Cooking
condition. (Oven does not shut off after a cup of water is boiling by Sensor Cooking.)

Oven stops at 16 seconds after starting.

AND

CONTROL UNIT

AH SENSOR

SHORTED OR OPENED WIRING

NOTE: For additional troubleshooting procedures, please refer back to the R-1200/1201 base model Service

Manual.

7

R-1210
R-1211

TEST PROCEDURES

PROCEDURE

LETTER

J TOUCH CONTROL PANEL ASSEMBLY TEST

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

Before testing,

1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of "
REMOVAL OF OVEN FROM WALL " and " OUTER CASE REMOVAL ".

2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.

4) Disconnect the leads to the primary of the power transformer.

5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.

1. Key Unit.
NOTE ;

1) Check key unit ribbon connection before replacement.

2) Re-install the outer case (cabinet).

3) Reconnect the power supply cord after the outer case is installed.

4) Run the oven and check all functions.

The following symptoms indicate a defective 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.
If the key unit is defective, replace the key unit.

2. Control Unit.
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure K) 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 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.

When testing is completed,

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.

4) Reconnect all leads removed from components during testing.

5) Re-install the outer case (cabinet).

6) Reconnect the power supply cord after the outer case is installed.

7) Run the oven and check all functions.

COMPONENT TEST

K KEY UNIT TEST

1. Disconnect the power supply cord.

8

TEST PROCEDURES

G11G12 G 9

G 8

POPCORN

BEVERAGE

SENSOR
REHEAT

CUSTOM

HELP

FRESH

VEGETABLES

POWER

LEVEL

BAKED

POTATOES

FRESH

ROLLS /

MUFFINS

FROZEN

ROLLS /

MUFFINS

SENSOR

COOK

CENTER

KEEP

WARM

PLUS

TIMER

CLOCK

HOT

WATER

DEFROST

CENTER

TASK

LIGHT

ACCENT

LIGHT

3

8

2

7

1

6

5

0

4

9

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

G10

STOP

CLEAR

START

MINUTE PLUS

R-1210
R-1211

PROCEDURE

LETTER

COMPONENT TEST

2. Open the door and block it open.

3. To discharge high voltage capacitor, wait for 60 seconds.

4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing 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 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 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.

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case cabinet.

7. Reconnect the power supply cord.

8. Run the oven and check all functions.

L RELAY TEST

1. Disconnect the power supply cord, and then remove outer case. Refer to procedure of “ REMOVAL
OF OVEN FROM WALL ” and “ OUTER CASE REMOVAL ”.

2. Open the door and block it open.

3. To discharge high voltage capacitor, wait for 60 seconds.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.

6. After that procedure, re-connect the power supply cord.

7. Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the
relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.

RY1, RY2, RY3 and RY4 Relay Test

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

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

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

control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

8. Disconnect the power supply cord.

9. Open the door and block it open.

RY1 Approx. -26.3V D.C. Oven lamp / Fan motor / Turntable motor
RY2(COOK) Approx. -25.3V D.C. Power transformer
RY3 Approx. -26.3V D.C. Hood lamp
RY4 Approx. -26.3V D.C. Hood lamp

9

R-1210
R-1211

TEST PROCEDURES

PROCEDURE

LETTER

10.To discharge high voltage capacitor, wait for 60 seconds.

11.Reconnect all leads removed from components during testing.

12.Re-install the outer case (cabinet).

13.Reconnect the power supply cord after the outer case is installed.

14.Run the oven and check all functions.

M DEFROST CENTER TEST

(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity.
(3) Close the door.
(4) Touch the “ DEFROST CENTER ” pad. And touch the number pad 2. Then touch the number pad 5.
(5) Touch the “ START ” pad.
(6) The oven is in Defrost center cooking condition.
(7) The oven will operate as follows.

Menu 1ST STAGE 2ND STAGE

Steaks/Chops LEVEL TIME LEVEL TIME

0.5lbs 60% 57sec. 40% 17sec.

(8) If improper operation is indicated, the control unit is probably defective and should be checked.

COMPONENT TEST

N FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

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.

1. Foil pattern check and repairs.

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.

4) Remove the power unit, referring to the procedure of “ RIGHT PANEL ASSEMBLY AND POWER
UNIT REMOVAL ”.

5) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 Only pattern at “a” is broken. *Insert jumper wire J1 and solder.
2 Pattern at “a” and “b” are broken. *Insert the coil RCILF2003YAZZ between “c” and “d”.

6) 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 which is approximately 780Ω ±
10%). If any abnormal condition is detected,
replace the defective parts.

7) Reconnect all leads removed from

RY1

components during testing.

8) Re-install the power unit to the right panel
and re-install the right panel to the oven.

9) Reconnect the power supply cord.

10) Run the oven and check all functions.

2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.

1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of “

REMOVAL OF OVEN FROM WALL ” and “ OUTER CASE REMOVAL ”.

d

13

VRS1

T1

a

(J1)

RY2

c

b

10

TEST PROCEDURES

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PROCEDURE

LETTER

COMPONENT TEST

2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.

4) Disconnect the leads to the primary of the power transformer.

5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.

6) After that procedure, re-connect the power supply cord.

7) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between

1 the normal open terminal of the relay RY2 and Check supply voltage and oven power cord.

the normal open terminal of the relay RY1.
The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

2

side of low voltage transformer. Check and repair.

8) Disconnect the power supply cord.

9) Open the door and block it open.

10) To discharge high voltage capacitor, wait for 60 seconds.

11) Reconnect all leads removed from components during testing.

12) Re-install the outer case (cabinet).

13) Reconnect the power supply cord after the outer case is installed.

14) Run the oven and check all functions.

O AH SENSOR TEST

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

(1) The oven should be plugged in at least two minutes before sensor cooking.
(2) Room temperature should not exceed 95˚F (35˚C).
(3) The unit should not be installed in any area where heat and steam are generated. The unit should

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

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

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

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

with a dry cloth or paper towel.

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

at refrigerator temperature and canned soup at room temperature.

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

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

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

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

Make sure the oven has been plugged in at least two minutes before checking sensor cook operation.
The cabinet should be installed and screws tightened.
(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2) Place the container on the center of tray in the oven cavity.
(3) Close the door.
(4) Touch the TIMER/CLOCK once, the POWER LEVEL pad twice, the START pad once, the number

pad 1 once and the number pad 4 once. Now, the oven is in the sensor cooking condition, and “ AH20

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

sensor cooking.

11

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TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

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

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

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

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

CHECKING CONTROL UNIT

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

tape.

(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:

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

the number pad 1 once and the number pad 4 once.

9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 19 seconds, push plunger of select switch for more than 3 seconds. This

condition is same as judgement by AH sensor.
9-4. After approximately 3 seconds, the display shows “ X X . X X ” which is the time for detecting

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

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

12

TEST PROCEDURES

Plunger

NC
NO

COM

COM

NO

NC

R3 R4

R1

R2

1
2
3

F-1
F-2

F-3

To connector (F)
on Control Unit.

CONNECTOR

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PROCEDURE

LETTER

COMPONENT TEST

(17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all

functions.

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

R1, R2 : 22Ω ± 1% 1/2W

R3 : 4.3kΩ ± 5% 1/4W
R4 : 1MΩ ± 5% 1/4W

Sensor Dummy Resistor Circuit

13

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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 Control unit consists of LSI Unit and

Power U nit)

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 P20, P21, P22, P23,
P24, P25, P26 and P27.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P43, P44,
P45 and P46 to perform the function that was requested.

Control Unit

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

1) LSI

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

2) Power Source Circuit

This circuit generates voltages necessary for 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.

3) Synchronizing Signal Circuit

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

4) Reset Circuit

A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.

5) Buzzer Circuit

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

6) Door Sensing Switch

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

7) Relay Circuit

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

8) Indicator Circuit

This circuit consists of 25 segments and 4 common
electrodes using a Light Crystal Display.

9) Back Light Circuit

A circuit to drive the back light (Light emitting diodes
LD1-LD4).

10) Absolute Humidity Sensor Circuit

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

Symbol Voltage Application
VC -5.3V LSI(IC1)

14

DESCRIPTION OF LSI

Maximum
output

70% of maximum
output

H : GND

L : -5V
H : GND

L : -5V

ON

ON

OFF

OFF OFF

24 sec.

8 sec.

LSI

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

Pin No. Signal I/O Description

1-2 VL2-VL1 IN Power source voltage input terminal.

Standard voltage for LCD.

3-6 AN7-AN4 IN Terminal to change cooking input according to the Model.

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

Model in operation is applied to set up its cooking constant.
7 AN3 OUT Back light circuit (Light emitting diodes) driving signal.
8 AN2 IN To input signal which communicates the door open/close information to LSI.

Door close “H” level signal (0V). Door open “L” level signal (-5V).
9 AN1 IN AH sensor input..

This input is an analog input terminal from the AH sensor circuit, and connected to the

A/D converter built into the LSI.

10 AN0 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is

an analog input terminal from the AH sensor circuit, and connected to the A/D converter

built into the LSI.

11-13 P57-P55 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

14 CNTR0 OUT Signal to sound buzzer (2.0 kHz).

A: key touch sound.

B: Completion sound.

15 P53 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
16 P52 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.

0.1 sec.

A

2.0 sec.

B

16.7 msec.

During cooking

H : GND

L : -5V
H : GND

L : -5V

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H : GND

L : -5V

17 P51 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
18 P50 OUT Terminal not used.
19 P47 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 P46 IN Signal coming from touch key.

When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27

will be input into P46. When no key is touched, the signal is held at “H” level.

21 P45 IN Signal similar to P46.

When either G11 line on key matrix is touched, a corresponding signal will be input into P45.

22 P44 IN Signal similar to P46.

When either G10 line on key matrix is touched, a corresponding signal will be input into P44.

23 P43 IN Signal similar to P46.

When either G9 line on key matrix is touched, a corresponding signal will be input into P43.

24 INT0 IN Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

16.7 msec.

15

H : GND

L : -5V

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Pin No. Signal I/O Description

25 P41 OUT Terminal not used.
26 P40 IN Connected to GND through the pull-down resistor R100.
27

RESET

IN Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied.

28-29 P71-P70 OUT Terminal not used.

30 XIN IN

Internal clock oscillation frequency input setting.

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: -5.0V.

VC voltage of power source circuit input.

33 P27 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G8 line keys on key matrix is touched.

34 P26 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G7 line keys on key matrix is touched.

35 P25 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G6 line keys on key matrix is touched.

36 P24 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G5 line keys on key matrix is touched.

37 P23 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G4 line keys on key matrix is touched.

38 P22 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G3 line keys on key matrix is touched.

39 P21 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G2 line keys on key matrix is touched.

40 P20 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G1 line keys on key matrix is touched.

41 P17 OUT Hood lamp driving signal.

To turn on and off relay(RY6). “L” level: During
Hood lamp ON. “H” level: During Hood lamp OFF.

42 P16 OUT Hood lamp driving signal.

To turn on and off relay(RY5). “L” level: During
Hood lamp ON. “H” level: During Hood lamp OFF.

43 P15 OUT Hood motor high / low driving signal.

To turn on and off relay(RY3). “L” level: During Hood
motor high. “H” level: During Hood motor low.

44 P14 OUT Hood motor driving signal.

To turn on and off relay(RY4). “L” level: During
Hood motor ON. “H” level: During Hood motor OFF.

45-47 P13-P11 OUT Terminal not used.

16

Pin No. Signal I/O Description

48-72

SEG24-SEG0

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 24 (48) ---------------- SEG24 (29) SEG 11 (61) ------------------ SEG11 (16)
SEG 23 (49) ---------------- SEG23 (28) SEG 10 (62) ------------------ SEG10 (15)
SEG 22 (50) ---------------- SEG22 (27) SEG 9 (63) ------------------ SEG 9 (14)
SEG 21 (51) ---------------- SEG21 (26) SEG 8 (64) ------------------ SEG 8 (13)
SEG 20 (52) ---------------- SEG20 (25) SEG 7 (65) ------------------ SEG 7 (12)
SEG 19 (53) ---------------- SEG19 (24) SEG 6 (66) ------------------ SEG 6 (11)
SEG 18 (54) ---------------- SEG18 (23) SEG 5 (67) ------------------ SEG 5 (10)
SEG 17 (55) ---------------- SEG17 (22) SEG 4 (68) ------------------ SEG 4 ( 9)
SEG 16 (56) ---------------- SEG16 (21) SEG 3 (69) ------------------ SEG 3 ( 8)
SEG 15 (57) ---------------- SEG15 (20) SEG 2 (70) ------------------ SEG 2 ( 7)
SEG 14 (58) ---------------- SEG14 (19) SEG 1 (71) ------------------ SEG 1 ( 6)
SEG 13 (59) ---------------- SEG13 (18) SEG 0 (72) ------------------ SEG 0 ( 5)
SEG 12 (60) ---------------- SEG12 (17)

73/74 VCC/VREF IN Connected to GND.

75 AVSS IN Connected to VC.
76 COM3 OUT Common data signal. Connected to LCD signal COM4.
77 COM2 OUT Common data signal. Connected to LCD signal COM3.
78 COM1 OUT Common data signal. Connected to LCD signal COM2.
79 COM0 OUT Common data signal. Connected to LCD signal COM1.
80 VL3 IN Power source voltage input terminal.

Standard voltage for LCD.

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17

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ABSOLUTE HUMIDITY SENSOR CIRCUIT

(1) Structure of Absolute Humidity Sensor

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

Thermistors

ventilation opening for sensing

Sensing part
(Open vessel)

Sensing part
(Closed vessel)

(2) Operational Principle of Absolute Humidity Sensor

The figure below shows the basic structure of an absolute
humidity sensor. A bridge circuit is formed by two

thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it
heated at about 150˚C (302˚F), the resultant heat is
dissipated in the air and if the two thermistors are placed
in different humidity conditions they show different
degrees of heat conductivity leading to a potential
difference between them causing an output voltage from
the bridge circuit, the intensity of which is increased as
the absolute humidity of the air increases. Since the
output is very minute, it is amplified by the operational
amplifier.

Absolute humidity vs,

R1

Operational
amplifier

+

Output
voltage

C

output voltage characteristic

resistance balance the bridge circuit is deviated to
increase the voltage available at AN1 terminal of the
LSI.
Then the LSI observes that voltage at AN1 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.

1) Absolute humidity sensor circuit

SW1

11

P57

SW2

12

P56

SW3

13

P55

SW4

17

P51

SW5

15

P53

10

AN0

LSI
(IC1)

9

AN1

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

F-1

C

F-3

3.57k

S

F-2

VA : -15V

R52

R51

3.32k

R50

330

C50

R53

1.8k

R53
R54
R55
R56
R57

0.1

R52

47k

uF

620k

300k
150k

75k

37.4k

51

C

+

IC2

VA : -15V

R54

360k

0.01uF

51

C

0.1uF

R50

15k

VC : -5V

R51

47k

50

C

D50

0.01uF

R2

S

R3

S : Thermistor
open vessel

C : Thermistor
closed vessel

utput voltage
O

Absolute humidity (g/m )

2

(3) Detector Circuit of Absolute Humidity Sensor Circuit

This detector circuit is used to detect the output voltage

of the absolute humidity circuit to allow the LSI to control

sensor cooking of the unit. When the unit is set in the

sensor cooking mode, 16 seconds clearing cycle occurs

than the detector circuit starts to function and the LSI

observes the initial voltage available at its AN1 terminal.

With this voltage given, the switches SW1 to SW5 in the

LSI are turned on in such a way as to change the

resistance values in parallel with R53 ~ R57. Changing

the resistance values results in that there is the same

potential at both F-3 terminal of the absolute humidity

sensor and AN0 terminal of the LSI. The voltage of AN1

terminal will indicate about -2.5V. This initial balancing

is set up about 16 seconds after the unit is put in the

Sensor Cooking mode. As the sensor cooking proceeds,

the food is heated to generate moisture by which the

18

SERVICING

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1. Precautions for Handling Electronic Components

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

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

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

approx. 1M ohm

2. Shapes of Electronic Components

Transistor
2SB1238

C

E

B

Transistor
KRA101M
KRC243M

B

C

E

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, before checking the performance of the touch
control panel,

1) Disconnect the power supply cord, and then remove

outer case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Disconnect the leads to the primary of the power

transformer.

5) Ensure that these leads remain isolated from other

components and oven chassis by using insulation
tape.

6) After that procedure, re-connect the power supply

cord.

After checking the performance of the touch control panel,

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) Re-connect the leads to the primary of the power

transformer.

4) Re-install the outer case (cabinet).

5) Re-connect the power supply cord after the outer
case is installed.

6) Run the oven and check all functions.

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, 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 activates 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
activates 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 connectors of the key unit to the control unit
being sure that the lead wires are not twisted.

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

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

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

19

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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

W ARNING AGAINST HIGH VOL T AGE:

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

WARNING:

1. Disconnect the power supply cord.

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;

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

W ARNING FOR WIRING

To prevent an electric shock, take the following pre­cautions.

1. Before wiring,

1) Disconnect the power supply cord.

2) Open the door block it open.

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

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

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

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

1. Door does not close firmly.

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

3. The door gasket or seal is damaged.

4. The door is bent or warped.

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

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

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

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

3. If the door is not closed.

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

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, Open lever, Open
button.

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

4. Insert the positive lock connector until its pin is locked
and make sure that the wire leads do not come off even
if the wire leads are pulled.

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

THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED

WITHOUT REMOVING THE OVEN FROM THE WALL

1. Hood lamps, hood lamp sockets and oven lamp.

2. Base cover and hood lamp glass assembly.

3. Turntable motor.

4. Right panel parts.

AH SENSOR REMOVAL

1. Disconnect the power supply cord, remove the oven
from wall, and remove outer case. (Refer to procedure of
"REMOVAL OF OVEN FROM WALL" AND "OUTER
CASE REMOVAL".) And proceed as follows.

2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60
seconds.

4. Disconnect the connector CN-F of AH sensor from the
power unit.

20

R-1210
R-1211

5. Remove the two (2) screws and one (1) washer holding
the AH sensor to the exhaust duct.

6. Release the wire lead of AH sensor from the ditch of the
exhaust duct.

7. Now, the AH sensor is free.

RIGHT PANEL ASSEMBLY AND POWER UNIT REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60
seconds.

4. Remove one (1) screw holding the right panel to the oven
cavity front face plate.

5. Release the right panel from the oven cavity front face
plate by lifting it up.

6. Disconnect the wire leads from the relays RY1 and RY2.

Screw

Screws

Sensor ground wire

AH sensor

Ditch

Exhaust duct

Wire lead of AH sensor

Hole

7. Disconnect the connectors CN-A, CN-B, CN-C and CN­F from the power unit.

8. Remove the right panel assembly from the oven.

9. Now, the right panel assembly is free.

10.Remove the two (2) screws holding the power unit to
the right panel.

11.Release the two (2) tabs holding the power unit to the
right panel.

12.Now, the power unit is free.

OVEN LAMP REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60
seconds.

4. Release the right panel assembly, referring to items 4 to
5 of "RIGHT PANEL ASSEMBLY AND POWER UNIT
REMOVAL". ( It is not necessary to disconnect any

OVEN LAMP SOCKET REMOVAL

1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60
seconds.

4. Turn the lamp socket and release it from the magnetron
duct.

5. Screw the oven lamp off from the lamp socket.

6. Now, the oven lamp is free.

7. Pull the wire leads from the oven lamp socket by pushing

connectors or wire leads from the power unit.

5. Release the oven lamp socket from the magnteron duct
by turning the socket counterclockwise.

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

7. Now the oven lamp is free.

the terminal hole of the oven lamp socket with the small
flat type screw driver.

8. Now, the oven lamp socket is free.

Oven lamp
socket

Terminal

Wire lead

Terminal hole

Flat type small
screw driver

DOOR REPLACEMENT

DOOR ASSEMBLY REMOVAL

1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60
seconds.

4. Disconnect the 11-pin wire harness from the power unit.

5. Release a snap band of the 11-pin wire harness from the
hole on the base plate R.

21

R-1210
R-1211

6. Remove the two (2) screws holding the bottom sash to
the oven cavity front face plate.

7. Remove the bottom sash with 11-pin wire harness from
the oven cavity front face plate. And remove the connecter
of the 11-pin wire harness from the long hole of the oven
cavity front face plate.

8. Remove the 11-pin wire harness from the bottom sash.

9. Insert a putty knife (thickness of about 0.5mm) into the
gap A between the upper door stopper and the choke
cover as shown in Figure C-4 to free engaging parts.

10.Lift up the upper door stopper.

11.Remove the lower door stopper from the door assembly
in a similar way which the upper door stopper is removed.

12.Now, the upper and lower door stoppers are free from
the door assembly.

13.Lift up the door assembly to release the upper and lower
door hinge pins from the upper and lower oven hinges.

14.Now, the door assembly is free.

Note: When the individual parts are replaced, refer to

"Door Disassembly".

DOOR ASSEMBLY REINSTALL

1. On reinstalling door, insert the lower oven hinge to lower
door hinge pin.

2. Insert the upper oven hinge to the upper door hinge pin.

3. Shut the door (close the contacts of interlock switches).

4. Make sure upper and lower oven hinges are inserted into
the upper an lower door hinge pins.

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

6. Reinstall the upper and lower door stoppers to the door
assembly.

7. Reinstall the 11-pin wire harness into the bottom sash.
The 11-pin wire harness should be held by three (3)
tabs on the bottom sash. And the marking portion on the
11-pin wire harness should be held by left tab as shown
in Figure C-3.

8. Insert the connector of the 11-pin wire harness into the
long hole of the oven cavity front face plate. And reinstall
the bottom sash to the oven cavity front face plate with
the two (2) screws.

9. Reconnect the 11-pin wire harness to the power unit.

10. Insert the snap band of the 11-pin wire harness into the
hole on the base plate R.

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

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

Note: The door on a microwave oven is designed to

act as an electronic seal preventing the leakage
of microwave energy from oven cavity during
cook cycle. This function does not require that
door be air-tight, moisture (condensation)-tight
or 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.

Upper door
hinge pin

Upper oven
hinge

RE-INSTALL

Door assembly

Latch
heads

Lower
oven
hinge

Upper door
stopper

Lower door
hinge pin

RE-INSTALL

Lower door
stopper

Bottom
sash

11-pin wire
harness

Figure C-2. Door Replacement and adjustment

Screw

Oven cavity

Door
assembly

Tabs

Bottom sash

front face plate

Marking

Screw

Connector

11-pin wire
harness

Figure C-3. 11-pin wire harness and bottom sash

DOOR DISASSEMBLY

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60
seconds.

4. Remove door assembly, referring to "DOOR
REPLACEMENT".
Replacement of door components are as follows:

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

22

R-1210
R-1211

Note: As the engaging part of choke cover and door frame

are provided at 15 places, do not force any particular
part.

CHOKE COVER

6. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
Figure C-4 to free engaging parts.

7. Pry the choke cover by inserting a putty knife in order
shown in Figure C-4.

8. Now choke cover is free from door panel and door frame.

NOTE: When carrying out any repair to the door, do not

bend or warp the slit choke (tabs on the door
panel assembly) to prevent microwave leakage.

DOOR FRAME ASSEMBLY

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

10.Release the door panel from the door frame assembly.

NOTE: It is easier to release the engaging parts of the upper

or lower door hinge pin side at first.

11.Now, door frame assembly is free.

LATCH SPRING, LATCH HEAD AND DOOR PANEL

12.Release the latch spring from the tab of the latch head
and tab of the door frame.

13.Release the latch head from the door frame.

14.Now, the latch spring and latch head are free.

Upper door stopper

A

Choke cover

Lower
door stopper

15.Releasing the four (4) tabs, remove the LCD holder from
the LSI unit.

16.Now the LSI unit is free.

NOTE: For 11-pin wire harness

1. When the PWB cover is reinstalled, route the 11-pin

wire harness under the hole of the PWB cover as
shown in Figure C-5.

2. Before the door panel is reinstalled to the door frame

assembly, make sure that the 11-pin wire harness is
held by the two (2) tabs and one (1) hole on the door
frame as shown in Figure C-5. And the marking
portion on the 11-pin wire harness should be held by
right tab on the door frame as shown in Figure C-5.

Screws

Tab

Door frame

PWB cover
Cushion

Hole

Tabs LSI unit

Tab

11-pin wire
harness

Tab

Tab

Marking

Tab

11-pin wire
harness

Hole

Figure C-5. Door frame assembly

NOTE: For key unit

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

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

2. When attaching the key unit to the door frame, adjust

the upper edge and left edge of the key unit to the
correct position of door frame.

3. Stick the key unit firmly to the door frame by rubbing

with soft cloth not to scratch.

Putty knife

Door frame

Figure C-4. Door Disassembly

LSI UNIT

9. Remove the two (2) screws holding the PWB cover to
the door frame assembly.

10.Remove the PWB cover from the door frame assembly.

11.Disconnect the ribbon cable of the key unit from the LSI
unit.

12.Releasing the two (2) lower tabs, remove the LSI unit
with the LCD holder from the door frame assembly.

13.Disconnect the 11-pin wire harness from the LSI unit.

14.Releasing the two (2) tabs, release the LCD from the
LCD holder.

NOTE: For LSI unit

Handle the LSI unit carefully so that the ribbon cable
does not come off. Because the ribbon cable is
glued on the LCD and the printed wiring board only
by heated paste.

Ribbon cable

Liquid Crystal

Display (LCD)

Figure C-6. LSI unit

of LSI unit

Printed wiring board

23

R-1210
R-1211

45

HIGH VOLTAGE

RECTIFIER

HIGH VOLTAGE

HIGH VOLTAGE

WIRE A

MAGNETRON

CAPACITOR

POWER

TRANSFORMER

HIGH VOLTAGE COMPONENTS

RED

WHT

WHT

REDRED

2

MAGNETRON

TEMPERATURE

FUSE

BLK

Blue

Marking

RED

BLK

GRY

OVEN LAMP &

SOCKET

3

WHT

RED

FAN

MOTOR

1

A

Power Supply

cord 120V 60Hz

BLK

GRN

WHT

1

2

B

3

BLK

WHT

GRN

BLK

C

CAVITY

TEMPERATURE

FUSE

BLK

FUSE &

HOLDER

D

RED

BLK

WHT

TURNTABLE

MOTOR

GRN

GRN

to Base Plate Right

GRN

ORG

WHT

WHT

Blue Marking

BRN

HOOD LAMP &

SOCKET

6

A

B

C

D

RED

RED

HOOD LAMP &

WHT

E

RED

GRN

N.O.

COM.

F

DOOR SENSING SWITCH

G

AH SENSOR

BLK

RED

WHT3

CN-F

1

2

RED

GRN

CN-B

2

1

11

CN-C

CN-F

13

POWER UNIT

2

1

RY1

CN-B

GRY

GRY

COM.

WHT

N.O.

WHT

H

WHT

WHT

MONITOR

SWITCH

COM.

RED

5

RED

9

WHT

RY4

8

GRY

CN-A

1

RY3

1

CN-A

7

6

PPL

BLU

N.C.

RED

1

T1

N.O.

COM.

SECONDARY INTERLOCK RELAY

RY2:

RY2:

BLK

BLK

RED

11

10

CN-C

BLK

PNK

2

5

GRN

ORG

345

321

4

YLW

ORG

BRN

RED

BRN

WHT

WHT

N.O.

PRIMARY

GRY

COM.

INTERLOCK

SWITCH

SOCKET

IC1

(on the door)

CN-C

1

LSI UNIT

CN-G

1

2

PNK
BLK

T

H

W

Y

8

R

G

11

7

L

P

P
L

B

U

6 9 10 11

R

N

G

4

L

Y

W

3215

ORG
RED
B

R

N

CN-C

11-PIN WIRE HARNESS

E

Figure S-1. Pictorial Diagram

F

G

H

1

2

3

45

6

24

R-1210

N.O

COM

N.O

COM

B-1

C 1

C 2

C 3

C 4

C 6

C 5

C 9

+

–

+

–

B-2

T1

AC(N)

GND

VA

INT

BUZZER

MICRO

OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR

OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR

AC(H)

MICRO

DOOR
SENSING
SWITCH

HOOD
LAMP

HOOD LAMP

HOOD LAMP

HOOD LAMP
COMMON

HOOD
LAMP

DOOR
SENSING
SWITCH

NOTE

: IF NOT SPECIFIED, 1/4W ± 5%

CN-B

CN-F

CN-A

CN-C

D1-D4
1N4002

RY1

RY2

RY3

RY4

D20 1SS270A

D40 1SS270A

C21
10µ/35v

SP1

PKM22EPT

Q21
KRC243M

Q22
KRA101M

1

5

6

4

7

8

ab

c

d

5

D3

D4

D2

D1

38

C1 0.1µ/50v

C51 0.1µ/50v

C2 1000µ/35v

VRS1

10G471K

(J1)

D21

1SS270A

D22

1SS270A

A 3

A 1

D23

1SS270A

A5

D24

1SS270A

R4 3.3k

R5 680 1w

R1 680 1w

Q1 2SB1238

+
–

C3 10µ/35v

ZD1

HZ16-1

R3 2.4k

C 7

C 8

R52

3.57kD

1/4w

R51

3.32kD

1/4w

C10

F-3

F-2

AHA

C11

AHR

C50 0.1µ/50v

R50 330 1w

R53 1.8kF 1/4w R54 360kF 1/4w

IC2
BA4558

F-1

IC2

R-1211

A

B

C

D

E

1

2

3

45

6

A

B

C

D

E

F

G

H

1

F

Figure S-2. Power Unit Circuit

2

3

45

6

25

G

H

R-1210
R-1211

KEY UNIT

CN-G

6

A

B

C

D

1

A

DEFKG HELP

B

LIQUID CRYSTAL DISPLAY

COOK SENSOR LBS

C

GND

2

SEG24

SEG24

SEG23

SEG23

SEG22

SEG22

SEG21

SEG21

SEG20

SEG20

SEG19

SEG19

SEG18

SEG18

SEG17

SEG17

SEG16

SEG16

SEG15

SEG15

SEG14

SEG14

SEG13

SEG13

SEG12

SEG12

SEG11

SEG11

SEG10

SEG10

SEG9

SEG9

SEG8

SEG8

SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
COM4

COM3 (IC1)

COM3

COM2 (IC1)

COM2

COM1 (IC1)

COM1

COM0 (IC1)

129

COM4 (LCD)
COM3 (LCD)
COM2 (LCD)
COM1 (LCD)

80

VL3

SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0

VCC

VREF
AVSS
COM3
COM2
COM1
COM0

SEG8

64

SEG8VL2

75

1

SEG9

SEG10

SEG9

VL1

SEG11

SEG10

AN7

SEG12

SEG11

AN6

SEG13

SEG12

60

5

AN5

SEG14

SEG13

AN4

3

SEG15

SEG14

AN3

SEG16

SEG15

AN2

SEG17

SEG16

AN1

SEG18

SEG17

55

10

AN0

VC

SEG19

SEG18

SEG19

P57

P56

EDC

SEG20

SEG21

SEG20

IC1

P55

SEG22

SEG21

CNTR0

SEG23

SEG22

50

15

P53

A

SEG24

SEG23

P52

SEG24

P51

B

P11

P12

P50

P47

R8 4.7k R7 4.7k R6 4.7k

(J17)

(J16) 4.7k

C50 0.01µ/25v

D

(J14)

(J12)

(J15) 4.7k

(J13) 4.7k

C51 0.01µ/25v

45

15k
R60

15k
R61

START

TIMER

CLOCK

15k

G

F

41

P13

45

20

P46

40 65

P14

P15

P16

P17

P20
P21
P22
P23
P24

35 70

P25
P26
P27

VSS

XOUT

30

XIN
P70
P71

RESET
P40
P41

25

P45

P44

P43

INT0

24

15k
R100

R62

15k
R63

15k
R64

15k
R65

15k
R66

15k
R67

G 6

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

MINUTE PLUS

STOP

LEVEL

CLEAR

POWER

1

6

2

7

3

8

4

9

5

0

G 9

G10G11G12

C60 330pF/50v
C61 330pF/50v
C62 330pF/50v
C63 330pF/50v

1M
R80

R72 270k
R73 270k

LIGHT

ACCENT

CUSTOM

TASK

KEEP

LIGHT

FRESH

SENSOR

VEGETABLES

BAKED

POTATOES

CENTER

SENSOR

DEFROST

HOT

WATER

FROZEN

FRESH

BEVERAGE

HELP

PLUS

WARM

REHEAT

POPCORN

COOK

CENTER

ROLLS /

MUFFINS

ROLLS /

MUFFINS

R74 270k

(J10)

(J11) 4.7k

R75 270k

0.01µ/25v
C4

E

CPU UNIT

R4 1k

F

R2 4.7k

R1 82

G

2SA1037AK
Q2

C3 0.01µ/25v

C2 47µ/16v

–

+

R3 4.7k

Q1

2SA1037AK

LD4

LD1 LD2 LD3

C1 0.1µ/50v

R5 15k

UDZ4.3B
ZD1

D50

MA152WA

R10 15k

/50v

0.1µ
C10

R9 680 1/2w

R52 47k

R51 47kR50 15k

C11 0.01µ/25v

Q10

DTA143EKA

R53 620k

E

R54 300k

D

R55 150kF

C

R56 75kF

B

R57 37.4kF

A

Q30

DTA143EKA

Q21

DTA143EKA

C20

0.1µ/50v

F

Q22

G

DTA143EKA

Q23

CF1

CSTS4.00MG03

R20 1k

DTA143EKA

/25v

0.01µ
C40

R41 15k

R68 15k

R40 4.7k

R69 15k

: IF NOT SPECIFIED, 1/16W ± 5%

R70 15k

R71 15k

E

Figure S-3. LSI Unit Circuit

F

G

CN-C

C 1

C 2

C 3

C10

C11

C 6

C 4

C 7

C 8

C 5

C 9

H

NOTE

H

GND

1

VA

2

INT

AHA

AHR

BUZZER

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

HOOD LAMP

3

45

MICRO.

HOOD LAMP

DOOR

SENSING

SWITCH

6

26

R-1210
R-1211

1

A

2

3

45

6

A

CN - F

3

1

DIP

B

R54

8

5

R53

C50

B

R51

D40

CN - B

C

1

2

RY1 RY2

D

D20

B

B

D21

Q21

R50

Q22

C21

E

ZD1

R52

14

IC-1

E

1

C3

E

R5

R3

Q1

R1

R4

C51

SP1

R2

(J2)

2

3

CN - C

C

111

BFB

D

C2

C1

QKITPB036MRE0

D1

VRS1

E

(J1)

1

D2

58

E

P

S

D3

3

F

D22

T1

RY4

D4

LOT NO

F

CN - A

D23

4

D24

G

15

RY3

G

H

H

Figure S-4. Printed Wiring Board

1

2

3

45

27

6

R-1210
R-1211

P ARTS LIST

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

The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION

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

ELECTRIC PARTS

1- 1 FH-DZB016MRY0 M High voltage rectifier assembly 1 AH

*

1- 2 RC-QZB018MRE0 M High voltage capacitor 1 AG

*

1- 3 QFS-TA013WRE0 M Temperature fuse 150˚C (Magnetron) 1 AE
1- 4 RMOTDA211WRE0 M Turntable motor 1 AL
1- 5 QFS-TA014WRE0 M Temperature fuse 150˚C (Cavity) 1 AF
1- 6 RMOTEB031MRE0 M Fan motor 1 AR
1- 7 RTRN-B068MRE0 M Power transformer 1 BC

*

∆

1- 8 RV-MZA288WRE0 M Magnetron 1 BK

*

1- 9 QFSHDB003MRE0 M Fuse holder 1 AD
1-10 QSW-MA085WRE0 M Primary interlock and door sensing switches 2 AE
1-11 FFS-BA016/KIT M Monitor switch (V-16G-2C25) with fuse (20A) assembly 1 AF
1-12 FACCDB011MRE0 M Power supply cord 1 AQ
1-13 QSOCLB006MRE0 M Oven lamp socket and hood lamp sockets 3 AE
1-14 RLMPTA068WRE0 M Oven lamp and hood lamps 3 AE
1-15 FDTCTA201WRK0 M AH sensor 1

CABINET PARTS

2- 1 HDECQB033MRF0 M Bottom sash [R-1210] 1 AH
2- 1 HDECQB034MRF0 M Bottom sash [R-1211] 1 AK
2- 2 GDAI-B066MRP0 M Base plate R 1 AF
2- 3 GCABUB108MRP0 M Outer case cabinet [R-1210] 1 AZ
2- 3 GCABUB109MRP0 M Outer case cabinet [R-1211] 1 AZ
2- 4 TMAPCB068MRR0 M Schematic diagram 1 AB
2- 5 FANGKB009MRY0 M Hood lamp glass assembly [R-1210] 1 AN
2- 5 FANGKB010MRY0 M Hood lamp glass assembly [R-1211] 1 AM
2-5-1 LANGQB016MRP0 M Hood lamp glass angle [R-1210] 1 AG
2-5-1 LANGQB020MRP0 M Hood lamp glass angle [R-1211] 1 AG
2-5-2 PGLSPB004MRE0 M Hood lamp glass 1 AH
2- 6 PCOVPB099MRT0 M Base cover [R-1210] 1 AR
2- 6 PCOVPB100MRT0 M Base cover [R-1211] 1 AS

RIGHT PANEL PARTS

3- 1 DPWBFB104MRU0 M Power unit 1
3- 1A QCNCMA017JDZZ M 3-pin connector CN-A 1
3- 1B QCNCMA275DRE0 J 2-pin connector CN-B 1 AB
3- 1C QCNCMA335DRE0 J 11-pin connector CN-C 1 AC
3- 1D QCNCMA237DRE0 J 3-pin connector CN-F 1 AD
C1 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB
C2 VCEAB31VW108M J Capacitor 1000 uF 35V 1 AF
C3 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB
C21 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB
C50-51 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 2 AB
D1-4 RH-DZA006PRE0 J Diode (1N4002) 4 AD
D20-24 VHD1SS270A/-1 J Diode (1SS270A) 5 AA
D40 VHD1SS270A/-1 J Diode (1SS270A) 1 AA
IC2 VHIBA4558//-6 J IC (BA4558) 1 AK
Q1 VS2SB1238//-3 J Transistor (2SB1238) 1 AA
Q21 VSKRC243M//-3 J Transistor (KRC243M) 1 AB
Q22 VSKRA101M//-3 J Transistor (KRA101M) 1 AB
R1 VRS-B13AA681J J Resistor 680 ohm 1W 1 AA
R3 VRD-B12EF242J J Resistor 2.4k ohm 1/4W 1 AA
R4 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 1 AA
R5 VRS-B13AA681J J Resistor 680 ohm 1W 1 AA
R50 VRS-B13AA331J J Resistor 330 ohm 1W 1 AA
R51 RR-DZA285DRZZ J Resistor 3.32k ohm ± 0.5% 1/4W 1 AC
R52 RR-DZA286DRZZ J Resistor 3.57k ohm ± 0.5% 1/4W 1 AC
R53 VRN-B12EK182F J Resistor 1.8k ohm ± 1.0% 1/4W 1 AA
R54 VRN-B12EK364F J Resistor 360k ohm ± 1.0% 1/4W 1 AA
RY1-2 RRLY-A113DRE0 M Relay (DU24D1-1PR(M)) 2
RY3-4 RRLY-B004MRE0 M Relay (FTR-F3AA024E) 2
SP1 RALM-A014DRE0 J Buzzer (PKM22EPT) 1 AG
T1 RTRNPB017MRE0 M Transformer 1
VRS1 RH-VZA032DRE0 J Varistor (10G471K) 1 AE
ZD1 VHEHZ161///-1 J Zener diode (HZ16-1) 1 AA
3- 2 HPNLCB150MRF0 M Right panel [R-1210] 1
3- 2 HPNLCB151MRF0 M Right panel [R-1211] 1

28

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

3- 3 JBTN-B116MRF0 M Open button [R-1210] 1
3- 3 JBTN-B117MRF0 M Open button [R-1211] 1
3- 4 MSPRTA050WRE0 M Button spring 1 AA
3- 5 PSHEPB078MRR0 M Menu label 1
3- 6 XEPSD30P10XS0 M Screw; 3mm x 10mm 2 AB

OVEN PARTS

4- 1 PDUC-B118MRF0 M Exhaust duct 1 AH
4- 2 FROLPB025MRK0 M Turntable support assembly 1 AN
4- 3 NTNT-A095WRE0 M Turntable tray 1 AN
4- 4 LBNDKB009MRP0 M Capacitor holder 1 AB
4- 5 PDUC-B111MRF0 M Magnetron duct 1 AF
4- 6 MLEVPB016MRF0 M Open lever 1 AD
4- 7 ************* M Oven cavity (Not replaceable part) 1 --

∆

4- 8 PPACGB014MRF0 M Turntable motor packing 1 AA
4- 9 PHOK-B018MRF0 M Latch hook 1 AF

∆

4-10 FANGTB006MRY0 M Unit mounting plate assembly 1 AS
4-11 NFANPB006MRE0 M Fan blade 1 AC
4-12 LBSHC0037WRE0 M Cord bushing 1 AB
4-13 MLEVFB008MRP0 M Mounting lever 2 AC
4-14 PSKR-B014MRP0 M Bottom air guide 1 AD
4-15 PCOVPB085MRP0 M Waveguide cover 1 AH
4-16 MSPRTA046WRE0 M Latch spring 2 AB
4-17 LANGTB055MRP0 M Chassis support 2 AD
4-18 LSTPPB039MRF0 M Upper door stopper 1 AB
4-19 LSTPPB040MRF0 M Lower door stopper 1 AB
4-20 PDUC-B113MRP0 M Fan duct 1 AH
4-21 PDUC-B117MRF0 M Orifice 1 AC
4-22 PCUSGB043MRP0 M Transformer cushion 1 AC
4-23 PCOVPB101MRP0 M Light cover 1 AE
4-24 PCUSUB065MRP0 M Cushion 1 AA

DOOR PARTS

5 CDORFB295MRK0 M Door assembly [R-1210] 1

∆

5 CDORFB296MRK0 M Door assembly [R-1211] 1

∆

5- 1 FDORFB072MRT0 M Door panel assembly 1 AW

∆

5- 2 FCOV-B200MRK0 M Door frame assembly [R-1210] 1

∆

5- 2 FCOV-B201MRK0 M Door frame assembly [R-1211] 1

∆

5-2-1 LSTPPB023MRF0 M Latch head 1 AC

∆

5-2-2 MSPRTA046WRE0 M Latch spring 1 AB
5-2-3 FUNTKB330MRE0 M Key unit [R-1210] 1
5-2-3 FUNTKB331MRE0 M Key unit [R-1211] 1
5-2-4 FW-VZB193MRE0 M 11-pin wire harness 1
5-2-5 PCOVPB098MRP0 M PWB cover 1 AD
5-2-6 PCUSGB045MRP0 M Cushion 1 AB
5-2-7 DUNT-B048MRK0 M LSI unit 1
5-2-8 LHLD-A237WRFZ M Light guide 1 AC
5-2-9 LHLD-B020MRF0 M LCD holder 1 AC
5-2-10 PSHEPA786WREZ M LED sheet 1 AD
5-2-11 XEPSD30P10XS0 M Screw : 3mm x 10mm 2 AB
5-2-12 PCUSUB067MRP0 M Cushion 1 AB
5-2-13 PCUSUB069MRP0 M Cushion 1 AB
5- 3 GCOVHB045MRF0 M Choke cover 1 AG

∆

5- 4 PSHEPB021MRE0 M Sealer film 1 AE
5- 5 XCPSD40P08000 M Screw : 4mm x 8mm 4 AA

MISCELLANEOUS

6- 1 CFZK-B460MRK0 M Installation material assembly 1 AH
6-1-1 LBSHC0040MRE0 M Grommet 1 AC
6-1-2 LX-BZ0195WRE0 M Toggle screw 4 AC
6-1-3 LX-MZB001MRE0 M Cord holder 1 AB
6-1-4 XBRSD50P60000 M Screw : 5mm x 60mm 2 AA
6-1-5 XOTSD40P12000 M Screw : 4mm x 12mm 3 AA
6-1-6 XTSSD50P35000 M Screw : 5mm x 35mm 6 AA
6-1-7 XWHSD50-16300 M Washer 2 AA
6- 2 LANG-B003MRP0 M Scale plate 2 AE
6- 3 TINSEB295MRK0 M Operation manual 1
6- 4 TINSKB082MRR0 M Top and Wall template 1 AE
6- 5 FW-VZB188MRE0 M Low voltage harness 1 AT
6- 6 QW-QZB025MRE0 M High voltage wire A 1 AT

*

6- 7 FW-VZB190MRE0 M Main harness 1 AU
6- 8 TCAUAB041MRR0 M DHHS service caution label 2 AA

R-1210
R-1211

29

R-1210
R-1211

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

6- 9 TCAUAB037MRR0 M Monitor caution label 1 AA
6-10 TCAUAB005MRR0 M Revised DHHS/GRD C/label 1 AB
6-11 QW-VZB011MRE0 M Sensor ground wire 1

SCREWS, NUTS AND WASHERS

7- 1 XOPSD40P12000 M Screw : 4mm x 12mm 7 AA
7- 2 XOTSF40P12000 M Screw : 4mm x 12mm [R-1210] 6 AA
7- 2 XOTSE40P12000 M Screw : 4mm x 12mm [R-1211] 6 AA
7- 3 XOTSD40P12000 M Screw : 4mm x 12mm 7 AA
7- 4 XHTSD40P08RV0 M Screw : 4mm x 8mm 2 AA
7- 5 LX-CZA038WRE0 M Special screw 5 AA
7- 6 LX-CZ0052WRE0 M Special screw 2 AA
7- 7 LX-BZA041WRE0 M Special screw 5 AA
7- 8 XCBSD30P08000 M Screw : 3mm x 8mm 5 AA
7- 9 XOTSD40P08000 M Screw : 4mm x 8mm 1 AA
7-10 LX-WZB003MRE0 M Sensor washer 1

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION

Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.

30

R-1210

;

;

;;;

;

;;;

;

;;

;

;

;;;

;;;

;;

;

;;

;;;

;;

;

;

;;;;;

;;;;;

;

4-10

2-4

4-17

7-6

1-10

1-9

6-9

4-17

6-8

7-5

7-5

7-5

7-5

7-1

A

6-10

7-2

4-13

4-15

4-8

7-8

2-1

2-6

1-13

7-2

7-2

1-14

7-2

7-3

7-2

1-4

1-11

7-3

2-5

1-10

4-21

4-13

7-7

4-16

4-16

7-5

7-9

7-1

4-20

4-5

1-7

4-23

4-24

4-22

7-3

4-14

7-3

7-1

5-2-4

2-2

6-8

4-9

7-4

1-8

1-14

1-13

4-6

4-3

4-7

4-2

7-3

4-11

7-8

7-1

7-8
6-11

7-3

2-3

7-10

1-15

6-11

4-1

7-8

7-8

1-5

4-12

1-12

7-1

7-1

1-3

1-6

1-2

1-1

4-4

7-7

7-1

2-5-1

2-5-2

1-11

B

B

A

R-1211

1

OVEN AND CABINET PARTS

A

B

C

D

2

3

45

6

A

B

C

D

E

E

F

G

F

G

H

H

1

2

3

31

45

6

R-1210
R-1211

1

A

RIGHT PANEL PARTS

2

3

45

6

A

DOOR PARTS

7-2

3-1

B

3-5

3-2

C

3-3

3-4

5-2-7

D

5-2-4

5-1

5-2-5

3-6

5-2-13

5-2-11

5-5

5-4

5

4-18

4-19

B

5-3

C

5-5

D

5-2-12

5-2-9

5-2

MISCELLANEOUS

5-2-3

5-2-8

5-2-10

5-2-1

E

6-6

E

5-2-2

5-2-6

F

6-7

F

6-1

6-1-1

6-1-4

6-1-5

6-1-2

G

6-1-3

6-1-6

6-1-7

6-2

6-11

6-5

G

H

1

2

3

45

6

H

32

PACKING AND ACCESSORIES

4-3

TURNTABLE TRAY

R-1210
R-1211

TOP PAD

SPADBB043MRE0

DOOR PROTECTOR

SPADP0221MRE0

WRAP COVER
SSAKH0103MRE0

BOTTOM PAD

SPADBB044MRE0

Non-replaceable items

PACKING CASE

SPAKCB324MRR3 [R-1210]
SPAKCB324MRR4 [R-1211]

6-2

SCALE PLATE

6-4

6-3

6-1

TOP & WALL TEMPLATE

OPERATION MANUAL

INSTALL MATERIAL ASSEMBLY

ACCESSORY PACK

SSAKAB004MRE0

33

R-1210
R-1211

COPYRIGHT © 2002 BY SHARP CORPORATION

ALL RIGHTS RESERVED.

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

34

'02 SHARP CORP. (3S0.700E) Printed in U.S.A