SHARP R-1855A Service Manual

SER VICE MANU AL

S99M138R1855E

O VER THE RANGE

MICROWAVE OVEN

MODEL R-1855A

R-1855A

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.

This model for the US and Canada markets, Please refer to the appropriate pages for service information.

TABLE OF CONTENTS

Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO

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

BEFORE SERVICING.......................................................................................................................................... 1

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

FOREWORD........................................................................................................................................................ 4

PRODUCT SPECIFICATIONS......................................................................................................... .................... 5

GENERAL INFORMATION ................................................................................................................................. 5

OPERATION ........................................................................................................................................................ 7

TROUBLESHOOTING GUIDE............................................................................................................................17

TEST PROCEDURE ...........................................................................................................................................20

TOUCH CONTROL PANEL ................................................................................................................................31

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE................................................................37

PICTORIAL DIAGRAM ....................................................................................................................................... 46

CONTROL PANEL CIRCUIT ..............................................................................................................................47

PRINTED WIRING BOARD ................................................................................................................................48

PARTS LIST........................................................................................................................................................49

PACKING AND ACCESSORIES........................................................................................................ .................55

OR:

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

SHARP ELECTRONICS CORPORA TION

Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

SHARP CORPORATION

SHARP ELECTRONICS OF CANADA LTD.

Head Office: 335 Britannia Road East, Mississauga, Ontario L4Z 1W9

[phone]

R-1855A

PRECA UTIONS T O BE OBSERVED BEFORE AND
DURING SER VICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICRO WAVE
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.

(RD2110U)

BEFORE SER VICING(USA)

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.

(RD2110U)

BEFORE SER VICING(CANAD A)

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 OF
CANADA LTD. immediately.

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 OF CANADA LTD. and NHW, CANADA immediately.

Service personnel should inform SHARP ELECTRONICS OF CANADA LTD. 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.

(RD8100U)

WARNING TO SERVICE PERSONNEL

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

R-1855A

Don't Touch !
Danger High Voltage

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
high-voltage capacitor (that is the connecting lead of the
high-voltage 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-1855A

MICRO WA VE MEASUREMENT PR OCEDURE (USA)

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 relay and door sensing switch shall prevent microwave radiation emission
in excess of the requirement as above mentioned, secondary interlock 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±5OC (68OF) 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 (3-1/2in.)
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 secondary interlock switch does turn the oven OFF before any door movement.

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

2

R-1855A

MICROWAVE MEASUREMENT PROCEDURE (CANADA)

After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must
be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard
for microwave ovens as undermentioned.

A. Requirements:

Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with it's service
controls and user controls adjusted to yield the maximum output, the leakage radiation, at all points at least 5 cm. from the
external surface of the oven, does not exceed:

1) 1.0mW/cm2 with the test load of 275 ± 15 ml of water at an initial temperature 20 ±5oC.

2) 5.0mW/cm

3) 5.0mW/cm

2

when the outer enclosure is removed with a test load of 275 ± 15 ml of water at an initial temperature 20±5oC.

2

without a test load.

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 CSA and NHW performance standard
for microwave ovens must be used for testing recommended instruments are , NARDA 8100 and NARDA 8200.

2) Place the oven tray in the oven cavity.

3) Place the load of 275±15 ml of tap water initially at 20±5oC in the center of the oven cavity.
The water container shall be a low form of 600 ml 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, 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 with enclosure installed :

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 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 secondary interlock switch does turn the oven OFF before any door movement.

C. Leakage test without enclosure:

1) Remove the enclosure (cabinet).

2) Grasp the probe of the survey instrument and hold it perpendicular to all mechanical and electric parts of the oven that is
accessible to the user of the oven including, but not limited to, the waveguide, cavity seams, magnetron gap between the
door and the body of the oven.

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

4) Measure carefully at the point of highest leakage and make sure that the highest leakage is under 5mW/cm2.

CAUTION: Special attention should be given to avoid electrical shock because HIGH VOLTAGE is generated during this test
No Load test

1) Operate the oven without a load and measure the leakage by the same method as the above test procedure " Leakage
test with enclosure installed"

2) Make sure that the highest leakage should not exceed 5mW/cm2.

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

3

R-1855A

SERVICE MANUAL

OVER THE RANGE

MICROWAVE OVEN

R-1855A

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the
SHARP OVER THE RANGE MICROWAVE OVEN, R-1855A.

It is recommended that service personnel carefully study the entire
text of this 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 no other visible damage with the oven.

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND
TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE

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.

USA MODEL

SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

WIRING DIAGRAMS

PARTS LIST

CANADIAN MODEL

OSAKA, JAPAN

4

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection)

60 Hertz
Single phase, 3 wire grounded

Power Output 850 watts (IEC-705 TEST PROCEDURE)

Operating frequency of 2450MHz
Convection Power Output 1400 watts
Case Dimensions Width 29-15/16"

Height 16-11/32"

Depth 15- 9/32"
Cooking Cavity Dimensions Width 17-1/8"

Height 8-1/16"

1.1 Cubic Feet Depth 13-13/16"
Hood lamp 2 bulbs, 30W x 2, Incandescent light bulbs
Hood fan Horizontal discharge 230 C.F.M. , Vertical discharge 240 C.F.M. ,
Control Complement Touch Control System

Clock ( 1:00 - 12:59 )

Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

P-HI ................................................ 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 Powe

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

R-1855A

CUSTOM HELP pad, SENSOR COOK pad, COMPU BROIL pad, COMPU ROAST pad
COMPU BAKE pad, SENSOR REHEAT pad, MINUTE PLUS pad, POPCORN pad
COMPU DEFROST pad, CONVECTION pad, REHEAT pad, LOW MIX/BAKE pad
HIGH MIX/ROAST pad, BROIL pad, SLOW COOK pad, KITCHEN TIMER pad
Number and temperature selection pads, CLOCK pad, KEEP WARM pad
TURNTABLE ON / OFF pad, POWER LEVEL pad, STOP/CLEAR pad,
START / TOUCH ON pad

Oven Cavity Light Yes 30W x 1 Incandescent light bulb
Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Canadian Standards Association.
Department of National Health and Welfare CANADA, Industry CANADA.

Weight Approx. 71 lbs.

GENERAL INFORMA TION

GROUNDING INSTRUCTIONS

This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.

WARNING: Improper use of the grounding plug can result in a risk of electric shock.

5

R-1855A

3-Pronged Plug

Grounded
Receptacle Box

Grounding Pin

3-Pronged Receptacle

Electrical Requirements
The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE
GROUNDING PIN FROM THE PLUG.
The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more branch circuit, using
a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood
system mounting location.

12

1

3

6

2

16

1. Oven door with see-through window.

2. Door hinges.

3. Stirrer cover.

4. Turntable motor shaft.

5. Oven lamp.
It will light when oven is operating or door is open.

6. Door latches.
The oven will not operate unless the door is securely closed.

7. One touch door open button.
Push to open door.

8. FAN-HI/LO button.
Push for High/Low/Off.

9. Light button.
Push for On/Off

10.Auto-Touch control panel.

11.Time display: Digital display, 99 minutes 99 seconds.

12. Ventilation openings.

13.Light Cover.

14.Grease filters.

15.Removable turntable.
The turntable will rotate clockwise or counterclockwise.
Only remove for cleaning.

16.Removable turntable support.

17. Plug

CONTROL PANEL

OVEN DIAGRAM

11

5

4

6

15

10

13

9
8

7

17

14

MIX CONV
DEFROST
SENSOR
TURNTABLE

ON OFF COOK LBS OZ KG HELP

INTERACTIVE COOKING SYSTEM

SENSOR

REHEAT

POPCORN

CONVEC

LOW MIX

BAKE

BROIL

100˚F 150˚F 275˚F 300˚F 325˚F

350˚F 375˚F 400˚F 425˚F 450˚F

KITCHEN

TURNTABLE

ON / OFF

MINUTE

PLUS

COMPU

DEFROST

REHEAT

HIGH MIX

ROAST

SLOW
COOK

12345
67890

TIMER

1 Baked potatoes
2 Frozen vegetables
3 Fresh veg-soft
4 Fresh veg-hard
5 Frozen entrees
6 Hot dogs
7 Bacon
8 Fish, seafood

1 Hamburgers
2 Chicken pieces
3 Steaks
4 Fish steaks

1 Chicken
2 Turkey
3 Turkey breast
4 Pork

1 Cake
2 Brownies
3 Muffins
4 French fries

CLOCK

POWER

LEVEL

KEEP

WARM

STOP

CLEAR

CUSTOM

HELP

SENSOR

COOK

COMPU

BROIL

COMPU

ROAST

COMPU

BAKE

START

TOUCH ON

6

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

R-1855A

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

OFF CONDITION

Closing the door activates the door sensing switch and
secondary 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 , , ,
, , , , and
.

To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.

COOKING CONDITION

Program desired cooking time touching the NUMBER pads.
When the START pad is touched, the following operations
occur:

1. The contacts of relays are closed and components

connected to the relays are turned on as follows.
(For details, refer to Figure O-2)

RELAY CONNECTED COMPONENTS
RY1 Oven lamp
RY2 Power transformer/ Stirrer motor
RY4 Turntable motor
RY5 Fan motor

2. 120 volts A.C. is supplied to the primary winding of the

power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2000 volts A.C. on the high voltage winding.

3. The filament winding voltage heats the magnetron filament

and the H.V. winding voltage is sent to a voltage doubler
circuit.

4. The microwave energy produced by the magnetron is

channelled through the waveguide into the cavity feed­box, and then into the cavity where the food is placed to
be cooked.

5. Upon completion of the cooking time, the power

transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.

6. When the door is opened during a cook cycle, monitor

switch, door sensing switch, secondary interlock switch
and third door switch and primary interlock relay are
activated with the following results. The circuits to the
stirrer motor, the cooling fan motor, the turntable motor,
and the high voltage components are de-energized, and
the digital read-out displays the time still remaining in the
cook cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation

of the secondary interlock switch, third door switch and
door sensing switch is mechanically associated with the
door so that it will function in the following sequence.

(1) When the door opens from a closed position, the

primary interlock relay, door sensing switch,
secondary interlock switch and third door switch
open their contacts, and then the monitor switch
contacts close.

(2) When the door is closed from the open position, the

monitor switch contacts first open, and then the
contacts of the secondary interlock switch and third

door switch close.
If the secondary interlock switch, third door switch and door
sensing switch fail with their contacts closed when the door
is opened, the closing of the monitor switch contacts will
form a short circuit through the monitor fuse, third door
switch, secondary interlock switch and primary interlock
relay, causing the monitor fuse to blow.

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
Power 10(P-HI) 32 sec. 0 sec.

(100% power)
Power 9(P-90) 30 sec. 2 sec.

(approx. 90% power)
Power 8(P-80) 26 sec. 6 sec.

(approx. 80% power)
Power 7(P-70) 24 sec. 8 sec.
(approx. 70% power)

Power 6(P-60) 22 sec. 10 sec.
(approx. 60% power)

Power 5(P-50) 18 sec. 14 sec.
(approx. 50% power)

Power 4(P-40) 16 sec. 16 sec.
(approx. 40% power)

Power 3(P-30) 12 sec. 20 sec.
(approx. 30% power)

Power 2(P-20) 8 sec. 24 sec.
(approx. 20% power)

Power 1(P-10) 6 sec. 26 sec.
(approx. 10% power)

Power 0(P-0) 0 sec. 32 sec.
(0% power)

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

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

CONVECTION COOKING CONDITION

PREHEATING CONDITION

Program desired convection temperature by touching the
PREHEAT pad and the temperature pad.

7

R-1855A

When the START pad is touched, the following operations
occur:

1. The coil of shut-off relays (RY1, RY4, RY5 and RY7) are
energized, the oven lamp, turntable motor, cooling fan
motor and convection motor are turned on.

2. The coil of relay (RY6) is energized by the control unit.
The damper is moved to the closed position, opening the
damper switch contacts. The opening of the damper
switch contacts sends a signal to the LSI on the control
unit de-energizing the relay (RY6) and opening the
circuit to the damper motor.

3. The coil of heater relay (RY3) is energized by the control
unit and the main supply voltage is applied to the heating
element.

4. When the oven temperature reaches the selected preheat
temperature, the following operations occur:
4-1 The heater relay is de-energized by the control unit

temperature circuit and thermistor, opening the
circuit to the heating element.

4-2. The oven will continue to function for 30 minutes,

turning the heater on and off, as needed to maintain
the selected preheat temperature. The oven will
shutdown completely after 30 minutes

CONVECTION COOKING CONDITION

When the preheat temperature is reached, a beep signal will
sound indicating that the holding temperature has been
reached in the oven cavity. Open the door and place the food
to be cooked in the oven.
Program convection temperature and desired cooking time
by touching the CONVECTION pad, Temperature pad and
NUMBER pad.
When the START pad is touched, the following operations
occur:

1. The numbers on the digital read-out start to count down
to zero.

2. The oven lamp, turntable motor, cooling fan motor and
convection motor are energized.

3. Heater relay (RY3) is energized (if the cavity temperature
is lower than the selected temperature) and the main
supply voltage is applied to the heating element to return
to the selected cooking temperature.

4. Upon completion of the cooking time, the audible signal
will sound, and oven lamp, turntable motor, cooling fan
motor and convection motor are de-energized. At the
end of the convection cycle, if the oven temperature is
above 275OF, the circuit to RY5 will be maintained (by
the thermistor circuit) to continue operation of the
cooling fan motor until the temperature drops below
245OF, at which time the relay will be de-energized,
turning off the fan motor. Relay RY7 will however, open
as soon as the convection cycle has ended, turning off
the convection motor.

5. At the end of the convection cook cycle, shut-off relay
(RY6) is energized turning on the damper motor. The
damper is returned to the open position, closing the
damper switch contacts which send a signal to the
control unit, de-energizing shut-off relay (RY6).

AUTOMATIC MIX COOKING CONDITION

Touch the LOW MIX/BAKE or HIGH MIX/ROAST pad. The
LOW MIX/BAKE pad is preprogrammed for 325OF with 10%
microwave power, while the HIGH MIX/ROAST pad is
preprogrammed for 325OF with 30% microwave power.
Program desired cooking time. When the START pad is

touched, the following operations occur:

1. The numbers on the digital read-out start to count down
to zero.

2. The shut-off relays (RY1, RY4, RY5 and RY7) are
energized, turning on the oven lamp, turntable motor,
cooling fan motor and convection motor.

3. The shut-off relay (RY6) is energized.
The damper plate is closed from the open position.

4. The heater relay (RY3) is energized, applying the main
supply voltage to the heating element.

5. Now, the oven is in the convection cooking condition.

6. When the oven temperature reaches the selected
temperature, the following operations occur:
6-1. The power supply voltage is alternated to the

heating element and power transformer.

6-2. The heating element operates through the heater

relay (RY3) contacts and the power transformer
operates through the primary interlock relay (RY2)
contacts.

6-3. These are operated by the control unit to supply

alternately within a 32 second time base, convection
heat and microwave energy.

The relationship between the convection and microwave
power operations are as follows.

Note: The ON and OFF time ratio does not correspond

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

26 SEC.6 SEC.

(MICRO.)

(CONVEC.)

(MICRO.)

(CONVEC.)

ON

OFF

LOW MIX

BAKE

12 SEC. 20 SEC.

ON

OFF

ON

OFF

32 SEC.

HIGH MIX

ROAST

MICROWAVE POWER

= APPROX. 10%

CONVECTION

TEMPERATURE

= 325˚F (165˚C)

MICROWAVE POWER

= APPROX. 30%

CONVECTION

TEMPERATURE

325˚F (165˚C)

Note: During alternate Microwave/Convection operation,

the convection heater is energized only if the cavity
temperature drops below the set temperature.

SENSOR COOKING CONDITION

Using the SENSOR COOK, SENSOR REHEAT or POP­CORN function, the foods are cooked or defrosted 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.

8

R-1855A

The time of supplementary cooking is determined by
experiment with each food category and inputted into the
LSI.
An example of how sensor works:

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

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. Touch SENSOR COOK, SENSOR REHEAT or
POPCORN pad. When Sensor Cook is touched, to
choose menu the number pad should be touched.

NOTE: The oven should not be operated on SENSOR

COOK, SENSOR REHEAT or POPCORN
immediately after plugging in the unit. Wait five
minutes before cooking on SENSOR COOK,
SENSOR REHEAT or POPCORN.

2. The coil of shut-off relays (RY1, RY4 and RY5) are
energized, the oven lamp, turntable motor and cooling
fan motor are turned on, but the power transformer is not
turned on.

3. After about 32 seconds, the cook relay (RY2) is energized.
The power transformer is turned on, microwave energy
is produced and first stage is started.
The 32 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.

COMPU BROIL, COMPU ROAST, COMPU BAKE

COMPU BROIL, COMPU ROAST and COMPU BAKE will

automatically compute the oven temperature, microwave
power and cooking time for broiling, roasting and baking. Set
the desired program by touching one of the COMPU BROIL,
COMPU ROAST or COMPU BAKE pad, and number pad.
Enter the weight by touching the Number pads. When the
START pad is touched, the following operations occur:

1. The COOK indicator will light and the CONV or MIX
indicator will light.

2. The cooking time will appear on the display and start
counting down to zero. The cooking time is adjusted
automatically according to the weight of the food.

3. The shut-off relays (RY1, RY4, RY5 and RY7) are
energized, turning on the oven lamp, turntable motor,
cooling fan motor and convection motor. The power
supply voltage is applied to the heating element.

4. Now, the oven is in the convection cooking mode or
Automatic Mix Cooking condition.

5. When the oven temperature has reached the
programmed convection temperature, the oven goes
into the programmed cooking mode.

6. At the end of the cooking cycle, the damper is returned
to the open position and the oven will go to the off
condition. The cooling fan will remain on until the oven
has cooled.

COMPU DEFROST COOKING

The COMPU DEFROST key is a special function key to
defrost meats and poultry faster and better. COMPU
DEFROST automatically defrosts roast beef, etc.. When
the COMPU DEFROST is selected and the food weight is
entered by using the COMPU DEFROST pad, the oven will
cook according to the special cooking sequence.

FIRE SENSING FEATURE (MICROWAVE MODE)

This model incorporates a sensing feature which will stop
the oven's operation if there is a fire in the oven cavity during
microwave cooking.
This is accomplished by the LSI repeatedly measuring the
voltage across the temperature measurement circuit (ther­mistor) during it's 32-seconds time base comparing the
obtained voltage measurements. If the most recent voltage
measured is 100mV greater than the previous voltage
measured, the LSI judges it as a fire in the oven cavity and
switches off the relays to the power transformer and fan
motor. The LSI also stops counting down and closes the
damper plate so that no fresh air will enter the oven cavity.
Please refer to the following section for a more detailed
description.

Operation

The following operation will start 4 minutes after the start
pad is touched. Please refer to the timing diagrams below.

1. The thermistor operates within a 32-seconds time base
and it is energized for three (3) seconds and off for 29
seconds. Two (2) seconds after the thermistor is
energized, the voltage across the temperature
measurement circuit is sampled by the LSI and twenty
one (21) seconds after the thermistor is cut off the LSI
turns on the convection motor for six (6) seconds.

2. The above procedure is repeated. If the difference
between the first voltage measured (in step 1) and the
voltage measured when the procedure is repeated (step

2) is greater than 100mV the LSI makes the judgment
that there is a fire in the oven cavity and will switch off

9

R-1855A

the relays to the power transformer and fan motor. The
LSI also stops counting down and closes the damper
door so that no fresh air will enter the oven cavity.

3. Once the fire sensor feature has shut the unit down, the
programmed cooking cycle may be resumed by pressing
the "START" pad or the unit may be reset by pressing the
"CLEAR" pad.

IMPORTANT:
During sensor cooking operation, the fire sensing
operation sequence will not begin until the AH sensor
has detected vapors and initiated a sensor cooking
cycle. This is because the operation of the convection
fan would interfere with the AH sensor's vapor detec­tion.

CONVECTION

MOTOR

THERMISTOR

Sensing

Voltage

0 2 24 30 64 (sec.)

3

ON

OFF

3 sec.

ON

OFF

ON

OFF

Sensing the voltage across the temperature measurement circuit.

6 sec.

32 (sec.)

3. RE-CIRCULATION (INSIDE VENTING)
The air handing is same as VERTICAL VENTING except
that the final air discharge is directed horizontally
through the upper front of the oven into the kitchen. IN
this case, the accessory charcoal filter lit RK-220 must
be provided to filter the air before it leaves the oven.

: AIR FLOW

HOOD FAN MOTOR

HOOD EXHAUST
LOUVER

HOOD
INTAKE
DUCT R

CHARCOAL
FILTER

VENTILATION METHODS HOT AIR EXHAUST

1. VERTICAL VENTING
For this venting method, hot air rising from the
conventional range below is drawn in by the hood fan
motor through the grease filters at the right and left sides
of the base cover, up through the right and left side intake
ducts, then discharged vertically at rear center top of the
oven, into the customer's vent system.

: AIR FLOW

HOOD FAN MOTOR

HOOD
INTAKE
DUCT R

GREASE
FILTER

2. HORIZONTAL VENTING
The air handing is same as VERTICAL VENTING except
that the final air discharge is directed horizontally out
from the top rear of the oven into the customer's vent
system.

: AIR FLOW

HOOD FAN MOTOR

HOOD
INTAKE
DUCT R

TO DUCTTO DUCT

TO DUCT

GREASE
FILTER

10

SCHEMATIC

HIGH
VOLTAGE
RECTIFIER

HIGH
VOLTAGE
CAPACITOR

0.9 F

POWER
TRANSFORMER

MAGNETRON

RY8

HL

HL

HOOD
LAMP

HOOD
MOTOR

HOOD
CAPACITOR

GRY BRN

BRN

C1A3A1

GRYBLU

RED

YEL

HOOD FAN
THERMAL
CUT OUTS

BLK
RED

FUSE
20A

RED RED

MAGNETRON
TEMPERATURE
FUSE

C3

BRN

C9

BLK

C5

C7

BLU

PPL

WHT

BLK

RED

YEL

PNK

RY10

RY9

WHT

WHT

RED

BLK

BLK

WHT-WHT

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

BRN

BLK

F1 F2 F3

E3 E4E6E5E2E1

RY1RY7RY4RY5RY6

DAMPER

THERMISTOR SWITCH

HEATING
ELEMENT

DOOR
SENSING
SWITCH

BLK

GRN

PNK

RED

N.O.
RY3

PPL

COM
RY3

COM
RY2

N.O.
RY1

DAMPER
MOTOR

FAN
MOTOR

OVEN
LAMP

ORG

OLCMFM

TTM

DM

CONVE­CTION
MOTOR

SECONDARY
INTERLOCK
SWITCH

TURN
TABLE
MOTOR

ORG

WHT

ORG

BLK

BLK

ORG

ORG

ORG

BLK

BRN WHT

BRN PPL

GRY

B7B1B3B5

A5

ORG

BLU

WHT

PPL

COM
RY1

N.O.
RY2

AH SENSOR

WHT WHT

RY3 RY2

CONTROL UNIT

STM

GRY

THIRD DOOR
SWITCH

120VAC
60Hz

BLK

WHT

GRN

GND

NOISE
FILTER

NOISE

RESISTOR

PNK

PRIMARY INTERLOCK

RELAY

HIGH
VOLTAGE
RECTIFIER

HIGH
VOLTAGE
CAPACITOR

0.9 F

POWER
TRANSFORMER

MAGNETRON

RY8

HL

HL

HOOD
LAMP

HOOD
MOTOR

HOOD
CAPACITOR

GRY BRN

BRN

C1A3A1

GRYBLU

RED

YEL

HOOD FAN
THERMAL
CUT OUTS

BLK
RED

FUSE
20A

RED RED

MAGNETRON
TEMPERATURE
FUSE

C3

BRN

C9

BLK

C5
C7

BLU
PPL

WHT

BLK

RED

YEL

PNK

RY10

RY9

WHT

WHT

RED

BLK

BLK

WHT-WHT

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

BRN

BLK

F1 F2 F3

E3 E4E6E5E2E1

RY1RY7RY4RY5RY6

DAMPER

THERMISTOR SWITCH

HEATING
ELEMENT

DOOR
SENSING
SWITCH

BLK

GRN

PNK

RED

N.O.
RY3

PPL

COM
RY3

COM
RY2

N.O.
RY1

DAMPER
MOTOR

FAN
MOTOR

OVEN
LAMP

ORG

OLCMFM

TTM

DM

CONVE­CTION
MOTOR

SECONDARY
INTERLOCK
SWITCH

TURN
TABLE
MOTOR

ORG

WHT

ORG

BLK

BLK

ORG

ORG

ORG

BLK

BRN WHT

BRN PPL

GRY

B7B1B3B5

A5

ORG

BLU

WHT

PPL

COM
RY1

N.O.
RY2

AH SENSOR

WHT WHT

RY3 RY2

CONTROL UNIT

STM

GRY

THIRD DOOR
SWITCH

120VAC
60Hz

BLK

WHT

GRN

GND

NOISE
FILTER

NOISE

RESISTOR

PNK

PRIMARY INTERLOCK

RELAY

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

R-1855A

Note:

When servicing units between serial number 111112 and 112161, use the
schematics in Figure O-1 through O-4.

Ref 2-6(TMAPCB058MRR0)

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START PAD TOUCHED.

Figure O-2. Oven Schematic - Microwave Cooking Condition

Ref 2-6(TMAPCB058MRR0)

Figure O-1. Oven Schematic - Off Condition

11

R-1855A

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CONVECTION PAD TOUCHED.

3. DESIRED TEMP. TOUCHED.

4. START PAD TOUCHED.

120VAC
60Hz

BLK

WHT

GRN

GND

NOISE
FILTER

FUSE
20A

RED RED

BLK
RED

HOOD FAN
THERMAL
CUT OUTS

NOISE

RESISTOR

WHT

BLK

RED

YEL

GRYBLU

BRN
PNK

BLU
PPL

HOOD
MOTOR

C3

C9

C5
C7

HOOD
CAPACITOR

RED

HL

GRY BRN

MAGNETRON
TEMPERATURE
FUSE

BLK

RY9

RY10

YEL

HOOD

BRN

LAMP

HL

PNK

RY8

C1A3A1

A5

ORG

DAMPER
MOTOR

CONTROL UNIT

ORG

DM

BLU

FAN
MOTOR

ORG

TURN
TABLE
MOTOR

PPL

SECONDARY
INTERLOCK
SWITCH

ORG

BLK

CONVE­CTION
MOTOR

BLK

TTM

WHT

STM

WHT

BLK

WHT-WHT

THIRD DOOR
SWITCH

POWER
TRANSFORMER

RED

HIGH

WHT

VOLTAGE
CAPACITOR

0.9 F

HIGH
VOLTAGE
RECTIFIER

HEATING
ELEMENT

OVEN
LAMP

COM

BRN PPL

RY3

ORG

DOOR
SENSING
SWITCH

RED

N.O.

PPL

RY3

RY3 RY2

THERMISTOR SWITCH

PNK

GRN

PRIMARY INTERLOCK

N.O.
RY2

WHT WHT

BLK

RELAY

DAMPER

BLK

BRN

E3 E4E6E5E2E1

F1 F2 F3

AH SENSOR

BLK

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

ORG

BLK

ORG

OLCMFM

WHT

COM

N.O.

BRN WHT

GRY

RY2

RY1

B7B1B3B5

RY1RY7RY4RY5RY6

COM
RY1

GRY

Ref 2-6(TMAPCB058MRR0)

Figure O-3. Oven Schematic - Convection Cooking Condition (CONVEC, PREHEAT, BROIL, SLOW COOK)

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. MIX COOKING PAD TOUCHED.

3. DESIRED TEMP. TOUCHED.

4. COOKING TIME PROGRAMMED.

5. START PAD TOUCHED.

NOTE: RY2 and RY3 will alternately close during cook cycle

MAGNETRON

FUSE
20A

RED RED

BRN

BLK

PNK

RED

HOOD FAN

NOISE
FILTER

THERMAL
CUT OUTS

NOISE

RESISTOR

WHT

BLK

RED

YEL

GRYBLU

HOOD
MOTOR

120VAC
60Hz

BLK

GRN

GND

WHT

Ref 2-6(TMAPCB058MRR0)

Figure O-4. Oven Schematic - Automatic Mix cooking Condition

BLU
PPL

C3

C9

C5
C7

MAGNETRON
TEMPERATURE
FUSE

BLK

HOOD
CAPACITOR

RED

YEL

HOOD
LAMP

HL

GRY BRN

RY9

RY10

HL

BRN

PNK

C1A3A1

RY8

A5

ORG

DAMPER
MOTOR

CONTROL UNIT

DM

ORG

BLU

FAN
MOTOR

ORG

PPL

TURN
TABLE
MOTOR

SECONDARY
INTERLOCK
SWITCH

ORG

BLK

CONVE­CTION
MOTOR

BLK

TTM

WHT

GRY

B7B1B3B5

12

STM

BLK

WHT

WHT-WHT

THIRD DOOR
SWITCH

POWER
TRANSFORMER

RED

HIGH

WHT

VOLTAGE
CAPACITOR

0.9 F

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

HEATING
ELEMENT

OVEN
LAMP

COM

BRN PPL

RY3

ORG

DOOR
SENSING
SWITCH

RED

N.O.

PPL

RY3

RY3 RY2

THERMISTOR SWITCH

PNK

GRN

PRIMARY INTERLOCK

N.O.
RY2

WHT WHT

BLK

RELAY

DAMPER

BLK

BRN

E3 E4E6E5E2E1

F1 F2 F3

AH SENSOR

BLK

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

ORG

BLK

ORG

OLCMFM

WHT

COM

N.O.

BRN WHT

RY2

RY1

RY1RY7RY4RY5RY6

COM
RY1

GRY

SCHEMATIC

HIGH
VOLTAGE
RECTIFIER

HIGH
VOLTAGE
CAPACITOR

0.9 F

POWER
TRANSFORMER

MAGNETRON

RY8

HL

HL

HOOD
LAMP

HOOD
MOTOR

HOOD
CAPACITOR

GRY BRN

BRN

C1A3A1

GRYBLU

RED

YEL

HOOD FAN
THERMAL
CUT OUTS

BLK
RED

FUSE
20A

RED RED

MAGNETRON
TEMPERATURE
FUSE

C3

BRN

C9

BLK

C5
C7

BLU
PPL

WHT

BLK

RED

YEL

PNK

RY10

RY9

WHT

WHT

RED

BLK

BLK

WHT-WHT

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

BRN

BLK

F1 F2 F3

E3 E4E6E5E2E1

RY1RY7RY4RY5RY6

DAMPER

THERMISTOR SWITCH

HEATING
ELEMENT

DOOR
SENSING
SWITCH

BLK

GRN

PNK

RED

N.O.
RY3

PPL

COM
RY3

COM
RY2

N.O.
RY1

DAMPER
MOTOR

FAN
MOTOR

OVEN
LAMP

ORG

OLCMFM

TTM

DM

CONVE­CTION
MOTOR

SECONDARY
INTERLOCK
SWITCH

TURN
TABLE
MOTOR

ORG

WHT

ORG

BLK

BLK

ORG

ORG

ORG

BLK

BRN WHT

BRN PPL

GRY

B7B1B3B5

A5

ORG

BLU

WHT

PPL

COM
RY1

N.O.
RY2

AH SENSOR

WHT

WHT

RY3 RY2

CONTROL UNIT

STM

GRY

THIRD DOOR
SWITCH

120VAC
60Hz

BLK

WHT

GRN

GND

NOISE
FILTER

NOISE

RESISTOR

PNK

PRIMARY INTERLOCK

RELAY

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

R-1855A

Note:
When servicing units with serial number 112162 and above, use the schematics

in Figure 1-1 through 1-4.

BRN
PNK

HOOD
MOTOR

BLU

PPL

C3

C9

C5
C7

MAGNETRON
TEMPERATURE
FUSE

BLK

HOOD
CAPACITOR

RED

YEL

HOOD
LAMP

HL

GRY BRN

RY9

RY10

120VAC
60Hz

BLK

WHT

GRN

GND

NOISE
FILTER

RED RED

BLK
RED

HOOD FAN
THERMAL
CUT OUTS

NOISE

RESISTOR

WHT

YEL

GRYBLU

FUSE
20A

BLK

RED

Ref 2-6(TMAPCB063MRR0)

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START PAD TOUCHED.

SECONDARY
INTERLOCK
SWITCH

ORG

A5

ORG

FAN

ORG

MOTOR

DM

DAMPER
MOTOR

BLU

RY8

C1A3A1

PNK

BRN

HL

CONTROL UNIT

ORG

PPL

TURN
TABLE
MOTOR

TTM

CONVE­CTION
MOTOR

BLK

WHT

BLK

ORG

BLK

ORG

OVEN

OLCMFM

LAMP

WHT

COM

N.O.

BRN WHT

GRY

RY2

RY1

B7B1B3B5

RY1RY7RY4RY5RY6

COM
RY1

GRY

COM

BRN PPL

RY3

HEATING
ELEMENT

ORG

DOOR
SENSING
SWITCH

RED

N.O.

PPL

RY3

RY3 RY2

Figure 1-1. Oven Schematic - Off Condition

THERMISTOR SWITCH

PNK

GRN

N.O.
RY2

WHT

WHT

BLK

F1 F2 F3

PRIMARY INTERLOCK

RELAY

DAMPER

BLK

BRN

E3 E4E6E5E2E1

AH SENSOR

BLK

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

STM

BLK

WHT

WHT-WHT

THIRD DOOR
SWITCH

POWER
TRANSFORMER

RED

HIGH

WHT

VOLTAGE
CAPACITOR

0.9 F

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

Ref 2-6(TMAPCB063MRR0)

Figure 1-2. Oven Schematic - Microwave Cooking Condition

13

R-1855A

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CONVECTION PAD TOUCHED.

3. DESIRED TEMP. TOUCHED.

4. START PAD TOUCHED.

120VAC
60Hz

BLK

WHT

GRN

GND

NOISE
FILTER

RED RED

BLK
RED

HOOD FAN
THERMAL
CUT OUTS

RESISTOR

WHT

YEL

GRYBLU

FUSE
20A

NOISE

BLK

RED

BRN
PNK

HOOD
MOTOR

BLU

PPL

C9

C5

C7

C3

HL

GRY BRN

MAGNETRON
TEMPERATURE
FUSE

BLK

RY9

RY10

HOOD
CAPACITOR

RED

YEL

HOOD
LAMP

A5

ORG

ORG

DM

DAMPER
MOTOR

BLU

RY8

C1A3A1

PNK

BRN

HL

CONTROL UNIT

FAN
MOTOR

ORG

TURN
TABLE
MOTOR

PPL

SECONDARY
INTERLOCK
SWITCH

ORG

BLK

CONVE­CTION
MOTOR

BLK

TTM

WHT

STM

BLK

WHT

THIRD DOOR
SWITCH

POWER
TRANSFORMER

WHT-WHT

RED

WHT

HIGH
VOLTAGE
CAPACITOR

0.9 F

HIGH
VOLTAGE
RECTIFIER

HEATING
ELEMENT

COM

BRN PPL

RY3

ORG

DOOR
SENSING
SWITCH

RED

N.O.

PPL

RY3

RY3 RY2

PNK

GRN

WHT

WHT

THERMISTOR SWITCH

BLK

PRIMARY INTERLOCK

RELAY

N.O.
RY2

DAMPER

BLK

BRN

E3 E4E6E5E2E1

F1 F2 F3

AH SENSOR

BLK

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

ORG

BLK

ORG

OVEN

OLCMFM

LAMP

WHT

COM

N.O.

BRN WHT

GRY

RY2

RY1

B7B1B3B5

RY1RY7RY4RY5RY6

COM
RY1

GRY

Ref 2-6(TMAPCB063MRR0)

Figure 1-3. Oven Schematic - Convection Cooking Condition (CONVEC, PREHEAT, BROIL, SLOW COOK)

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. MIX COOKING PAD TOUCHED.

3. DESIRED TEMP. TOUCHED.

4. COOKING TIME PROGRAMMED.

5. START PAD TOUCHED.

NOTE: RY2 and RY3 will alternately close during cook cycle

MAGNETRON

FUSE
20A

RED RED

BRN

BLK

PNK

RED

HOOD FAN

NOISE
FILTER

THERMAL
CUT OUTS

NOISE

RESISTOR

WHT

BLK

RED

YEL

GRYBLU

HOOD
MOTOR

120VAC
60Hz

BLK

GRN

GND

WHT

Ref 2-6(TMAPCB063MRR0)

BLU
PPL

C3

C9

C5

C7

MAGNETRON
TEMPERATURE
FUSE

BLK

HOOD
CAPACITOR

RED

HOOD
LAMP

HL

GRY BRN

YEL

RY9

RY10

A5

ORG

ORG

DM

DAMPER
MOTOR

BLU

RY8

C1A3A1

PNK

BRN

HL

CONTROL UNIT

FAN
MOTOR

ORG

TURN
TABLE
MOTOR

PPL

SECONDARY
INTERLOCK
SWITCH

ORG

CONVE­CTION
MOTOR

BLK

TTM

WHT

BLK

ORG

BLK

ORG

OVEN

OLCMFM

LAMP

WHT

COM

N.O.

BRN WHT

GRY

B7B1B3B5

RY2

RY1

RY1RY7RY4RY5RY6

COM
RY1

GRY

COM

BRN PPL

RY3

HEATING
ELEMENT

ORG

RED

N.O.

PPL

RY3

RY3 RY2

DOOR
SENSING
SWITCH

PNK

WHT

THERMISTOR SWITCH

BLK

BLK

F1 F2 F3

PRIMARY INTERLOCK

RELAY

BRN

E3 E4E6E5E2E1

AH SENSOR

GRN

WHT

N.O.
RY2

DAMPER

BLK

MONITOR
SWITCH

STIR­RER
MOTOR

WHT

Figure 1-4. Oven Schematic - Automatic Mix cooking Condition

14

STM

BLK

WHT

THIRD DOOR
SWITCH

POWER
TRANSFORMER

WHT-WHT

RED

WHT

HIGH
VOLTAGE
CAPACITOR

0.9 F

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

DESCRIPTION AND FUNCTION OF COMPONENTS

R-1855A

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 open lever, and then the open lever pushes up the latch
head. The latch heads are moved upward and released from
latch hook. Now the door will open.

LATCH HOOK

DOOR

LATCH
HEADS

OPEN LEVER

DOOR SENSING
SWITCH

MONITOR FUSE

MONITOR
SWITCH

SECONDARY
INTERLOCK
SWITCH

THIRD
DOOR
SWITCH

Figure D-1. Door Open Mechanism

SECONDARY INTERLOCK SWITCH, THIRD DOOR
SWITCH & DOOR SENSING SWITCH

The secondary interlock switch and third door switch
mounted parrallel to each other horizontally in the upper
positions of the latch hook, the door sensing switch is
mounted horizontally in the upper position of the latch hook.
They are activated by the latch head on the door. When the
door is opened, the switches interrupt the power to all high
voltage components, except the oven lamp . A cook cycle
cannot take place until the door is firmly closed thereby
activating all interlock switches. The interlock system
consists of the door sensing switch and the primary
interlock relay located on the control circuit board.

operate inversely.)

3. If the door is opened, and the primary interlock relay,
secondary interlock switch and third door switch contacts
fail to open, the monitor fuse blows simultaneously with
closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE, TEST THE PRIMARY INTERLOCK RE­LAY, THIRD DOOR SWITCH, DOOR SENS­ING SWITCH, MONITOR SWITCH AND SEC­ONDARY INTERLOCK SWITCH FOR PROPER
OPERATION. (REFER TO CHAPTER "TEST
PROCEDURE").

NOTE: MONITOR FUSE, SECONDARY INTERLOCK

SWITCH AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.

TEMPERATURE FUSE (MG)

The temperature fuse located near the waveguide 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 temperature fuse remains closed.
However, the temperature fuse will open at 302OF (150OC)
causing the oven to shut down.

THERMAL CUT-OUT (HOOD )

This thermal cut-out located on the base plate right and the
hood intake duct (left), It is designed to automatically turn
on the hood fan motor whenever the hot air rising from the
conventional range below causes the temperature at the
thermal cut-out to rise to 140OF (60OC) or higher, thus
removing this hot air from around microwave oven. When
the temperature around the thermal cut-out drops to 113OF
(45OC) or lower, the thermal cut-out shuts off the food fan
motor.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turntable
cook evenly during cooking. Turntable will turn in either
direction. The turntable motor can be turned off by touching
TURNTABLE ON/OFF pad.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative, by means of
blowing the monitor fuse, when the contacts of the second­ary interlock switch and third door switch fail to open when
the door is opened.

Functions:

1. When the door is opened, the monitor switch contact close
(to the ON condition) due to their being normally closed.
At this time the primary interlock relay, secondary interlock
switch and third switch are in the OFF condition (contacts
open) due to their being normally open contact switches.

2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing switch,
secondary interlock switch and third door switch contacts
close. (On opening the door, each of these switches

COOLING FAN MOTOR

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

HOOD FAN MOTOR

The hood fan motor is a two-speed, single-phase, double
pole induction type, requiring a hood fan capacitor. It is
located outside the upper rear part of the oven cavity, is to
remove, from around the oven, hot air rising from the
conventional electric or gas range over which it is installed.
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.

15

R-1855A

STIRRER MOTOR

The stirrer motor drives the stirrer fan to stir the microwave
radiation from the waveguide.

HOOD LAMP

The hood lamps are mounted at the hood lamp angle on the
base cover. When the hood lamp button is pushed, the hood
lamp relay (RY8) contacts close turning both hood lamps on.

HEATING ELEMENT

The heating element is located at the left side of the oven
cavity. It is intended to heat air driven by the convection fan.
The heated air is kept in the oven and force-circulated and
reheated by the heating element.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where
food is not directly heated by the heating element, but is
heated by forced circulation of the hot air produced by the
heating element.
The air heated by the heating element is circulated through
the convection passage provided on the outer casing of the
oven cavity by means of the convection fan which is driven
by the convection motor. It then enters the inside of the oven
through the vent holes provided on the left side of the oven.
Next, the hot air heats the food on the turntable and leaves
the oven cavity through the vent in the center of the oven
cavity left side wall.
Without leaving the oven, this hot air is reheated by the
heating element, passes through the convection passage
and enters the inside of the oven cavity again, in a continuing
cycle.
In this way, the hot air circulates inside the oven cavity to
raise its temperature and, at the same time, comes into
contact with the food being cooked.
When the temperature inside the oven cavity reaches the
selected temperature, the heating element is de-energized.
When the temperature inside the oven cavity drops below
the selected temperature, the heating element is energized
again. In this way, the inside of the oven cavity is maintained
at approximately the selected temperature.
When the convection time reaches 0, the heating element
is de-energized and the convection fan stops operating and
the oven shuts off.

DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except during
convection cooking. Damper position is set automatically
by damper motor, damper switch and motor cam. These
components are operated by a signal that judges if micro­wave cooking or convection cooking operation is selected
by the control unit.

Microwave Cooking:

Damper is in the open position, because a portion of cooling
air is channeled through the cavity to remove steam and
vapors given off from the heating foods.
It is then exhausted at the top of the oven cavity into a
condensation compartment.

Convection Cooking:

Damper is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.

Damper Operation

1. When power supply cord is plugged in:
1-1. When power supply cord is plugged in, a signal is

sensed in the control unit, and operates shut-off
relay (RY6).

1-2. Contacts of shut-off relay (RY6) close, the damper

motor is energized, opening the damper plate.

1-3. When the damper is moved to the open position by

the damper cam the damper switch is closed (ON
position).

1-4. The signal from damper switch is re-sensed in the

control unit and shut-off relay (RY6) is turned off.

1-5. The 120 volts A.C. to the damper motor is removed

and the motor turns off.

2. When oven is microwave cooking:
Damper is in the open position.

3. When oven is convection cooking:
3-1. Damper motor is energized by touching the

convection, temperature, number and START pads.

3-2. When damper is in the closed position (damper

switch is OFF), its signal is sensed by the control
unit, and shut-off relay (RY6) is de-energized.

3-3. The damper is held in the closed position during the

convection cooking operation.

3-4. At the end of the convection cooking, shut-off relay

(RY6) is energized, and the damper is returned to
the open position.

NOTE: If the damper plate is not in the proper position,

closed during convection or open during microwave,
the control unit will stop oven operation after 1
minute.

DAMPER PLATE

DAMPER CAM

DAMPER SWITCH

DAMPER MOTOR

Figure D-2. Damper Mechanism

16

R-1855A

TROUBLESHOO TING 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 secondary interlock switch,

door sensing switch, primary interlock relay(RY2), third door switch and monitor switch, before replacing
the monitor fuse. If the monitor fuse is replaced, the monitor switch and primary switch must also be replaced.
Use part FFS-BA018/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.

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.

17

R-1855A

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.

CK = Check / RE = Replace

CONDITION

OFF
CONDITION

IDLE
CONDITION

COOKING
CONDITION
(COMMON)

MICROWAVE
COOKING
CONDITION

CONVECTION
COOKING
CONDITION

SENSOR
COOKING
CONDITION

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

PROBLEM
Home fuse blows when power cord is plugged into wall receptacle.
Monitor fuse blows when power cord is plugged into wall receptacle.
Display does not illuminate when power cord is first plugged into wall recepta-

cle.
Display does not operate properly when STOP/CLEAR key is touched. (The

time of day should appear on the display with beep sound during normal
condition.)

Oven lamp does not light with door is opened.
Hood fan motor operates when power cord is first plugged into wall receptacle.
Temperature of oven base seems more than 140½F (60½C) because of operation

of the range below. But hood fan motor does not turn on automatically.
(Normally, food fan motor should be operating at low speed.)

Hood lights do not turn on with pushed HOOD LAMP button.
Hood fan motor does not rotate at all with pushed FAN button.
Speed of the hood fan motor does not change when the FAN button is touched

for this function.
Oven lamp does not light in cook cycle. (But it does light when door is opened.)
Fan motor does not operate. (Oven lamp and turntable motor operate.)
Turntable motor does not operate (Oven lamp lights and fan motor operate.)
Cooking cycle runs 1 minute then shuts down.
Oven does not go into cook cycle when START pad is touched
Oven seems to be operating but little or no heat is produced in oven load. (Food

incompletely cooked or not cooked at all at end of cook cycle.)
Oven goes into a cook cycle but extremely uneven heating is produced in oven

load (food).
Variable cooking does not operate properly except Cooking Power 10 (P-HI)

mode.
Function of COMPU DEFROST does not operate properly.
Stirrer motor does not operate. (Other parts operate.)
CONV indicator lights, but oven does not go into cook cycle when START pad

is touched.
CONV indicator lights, but heating element does not heat.
Temperature in the oven cavity is lower or higher than preset.
Convection motor does not operate.
Convection cycle runs 4 minutes and 15 seconds then shuts down.
The oven stops and "ERROR" is displayed or does not end during Sensor

Cooking condition. (Oven does not shuts off after a cup of water is boiling by
Sensor Cooking.)

Oven stops at 32 seconds after starting.

ABCDEFGHIJK L

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER

HIGH VOLTAGE CAPACITOR

SEC. INTERLOCK AND DOOR SEN. SWITCH

PRIMARY INTERLOCK SYSTEM

MONITOR SWITCH

DAMPER SWITCH

MONITOR FUSE

TEMPERATURE FUSE (MG)

HOOD THERMAL CUT-OUT

THERMISTOR

18

R-1855A

IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary

interlock relay, door sensing switch, third door switch and secondary interlock switch before replacing the
monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA018/
KIT as an assembly.

M N O P Q R S S S S S S S S S S U V RERE RE RE CKCKRE CK RE RE CK CK W

HOOD FAN MOTOR

DAMPER MOTOR

CONVECTION HEATER

CHECKING TEMPERATURE

CONTROL UNIT

KEY UNIT

RELAY (RY1)

RELAY (RY2)

RELAY (RY3)

RELAY (RY4)

RELAY (RY5)

RELAY (RY6)

RELAY (RY7)

RELAY (RY8)

RELAY (RY9)

RELAY (RY10)

FOIL PATTERN ON PWB.

AH SENSOR

OVEN LAMP OR SOCKET

FAN MOTOR

TURNTABLE MOTOR

STIRRER MOTOR

TURNTABLE OFF CONDITION

CONVECTION MOTOR

HOOD LAMP OR SOCKET

HOOD MOTOR CAPACITOR

SHORTED OR OPENED WIRING

SHORTED IN POWER CORD

NO POWER AT OUTLET

LOW VOLTAGE

NOISE FILTER

19

R-1855A

TEST PROCEDURES

PROCEDURE

LETTER

A MAGNETRON ASSEMBLY TEST

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. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check
across the magnetron filament leads should indicate less than 1 ohm.

5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads
and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance
the magnetron is grounded and must be replaced.

6. Reconnect all leads removed from components during testing.

7. Reinstall the outer case (cabinet).

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

9. Run the oven and check all functions.

MICROWAVE OUTPUT POWER

The following test procedure should be carried out with the microwave oven in a fully assembled condition
(outer case fitted).

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD
BE OBSERVED.

Power output of the magnetron can be measured by performing a water temperature rise test. This test
should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will
require a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type
temperature tester. For accurate results, the following procedure must be followed carefully:

1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water
with a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple
through the water until the temperature stabilizes. Record the temperature of the water.

2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60
seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second
hand of a watch or the digital read-out countdown.

3. Remove the cup from the oven and again measure the temperature, making sure to stir the
thermometer or thermocouple through the water until the maximum temperature is recorded.

4. Subtract the cold water temperature from the hot water temperature. The normal result should be
21 to 39OF(11.7 to 21.7O) rise in temperature. If the water temperatures are accurately measured
and tested for the required time period the test results will indicate if the magnetron tube has low
power output (low rise in water temperature) which would extend cooking time or high power output
(high rise in water temperature) which would reduce cooking time. Because cooking time can be
adjusted to compensate for power output, the magnetron tube assembly should be replaced only if
the water temperature rise test indicates a power output well beyond the normal limits. The test is
only accurate if the power supply line voltage is 120 volts and the oven cavity is clean.

COMPONENT TEST

B POWER TRANSFORMER TEST

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 primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance
of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 123 ohms; the resistance of the filament coil should be less than 1 ohm.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)

20

TEST PROCEDURES

R-1855A

PROCEDURE

LETTER

C HIGH VOLTAGE RECTIFIER TEST

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. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance
across the terminals and observe, reverse the leads to the rectifier terminals and observe meter
reading. If a short is indicated in both directions, or if an infinite resistance is read in both directions,
the rectifier is probably defective and should be replaced.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.

D HIGH VOLTAGE CAPACITOR TEST

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. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads
and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate
continuity for a short time and should indicate an open circuit once the capacitor is charged. If the
above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either
of the terminals and case. If it is shorted, replace the capacitor.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

COMPONENT TEST

E SECONDARY INTERLOCK SWITCH AND THIRD DOOR SWITCH TEST

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. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the secondary interlock switch.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH

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. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the door sensing switch.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the cooling

fan, turntable and oven light will be activated by RY1.

21

R-1855A

TEST PROCEDURES

PROCEDURE

LETTER

F

PRIMARY INTERLOCK RELAY (RY2)

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 two (2) wire leads from the male tab terminals of the Secondary Interlock Relay. Check
the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay
contacts are closed, replace the circuit board entirely or the relay itself.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

G MONITOR SWITCH TEST

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. Before performing this test, make sure that the primary interlock switch and the secondary interlock
relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire
lead from the monitor switch (NC) terminal. Check the monitor switch operation by using the
ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the
monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate
of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed
in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be
defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (NC) terminal
and check the continuity of the monitor circuit.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all
functions.

COMPONENT TEST

H DAMPER SWITCH TEST

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 wire leads from the switch terminals and connect ohmmeter leads to the
common (COM.) and normally open (N.O.) terminals of the switch.

5. When switch actuator is pushed by the damper cam, the meter should be indicated a closed circuit.

6. When power cord is plugged into the wall receptacle, the damper motor operates and damper cam
will start to rotate. When the switch actuator is released, the meter should be indicated an open circuit.
If improper operation is indicated, replace the damper switch.

7. Reconnect all leads removed from components during testing.

8. Reinstall the outer case (cabinet).

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

10.Run the oven and check all
functions.

SCREW
DRIVER

WHITE

BLACK
BLACK

MONITOR SWITCH

22

TEST PROCEDURES

R-1855A

PROCEDURE

LETTER

I BLOWN MONITOR FUSE

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. If the monitor fuse is blown when the door is opened, check the secondary interlock relay, secondary,
primary switch and monitor switch according to the "TEST PROCEDURE" for those switches before
replacing the blown monitor fuse.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK

RELAY, SECONDARY INTERLOCK SWITCH, THIRD DOOR SWITCH, DOOR SENSING

SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must
be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA018/KiT, even if
the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised
of a 20 ampere fuse and switch.

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

J TEMPERATURE FUSE TEST

MAGNETRON TEMPERATURE FUSE

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. A continuity check across the temperature fuse terminals should indicate a closed circuit. If the
temperature of the magnetron reaches approximately 302OF(150OC), the temperature fuse opens.
An open temperature fuse indicates overheating of the magnetron. Check for restricted air flow to
the magnetron, especially the cooling fan air guide.

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

COMPONENT TEST

CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA-

TURE, REPLACE THE TEMPERATURE FUSE.

K HOOD THERMAL CUT-OUT TEST

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. A continuity check across the thermal cut-out terminals should indicate an open circuit unless the
temperature of the thermal cut-out reaches approximately 140OF(60OC) or more. At that temperature,
the contacts will close. The thermal cut-out opens automatically at approximately 113OF(45OC).

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

L THERMISTOR TEST

Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an
ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.

Room Temperature Resistance
68FO(20OC) - 86OF(30OC) Approx. 360k ohm - 152k ohm

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

23

R-1855A

TEST PROCEDURES

PROCEDURE

LETTER

M HOOD FAN MOTOR TEST

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. If the motor does not turn, touch the HOOD FAN button once (set hood fan motor power "HIGH")
and check voltage between pins "1" and "2" (Blue and Black wires) of the 6 pin connector. If 120 Volts
appear and the hood capacitor is good, replace the hood fan assembly. If 120 Volts does not appear,
check the motor circuit. The resistance values of motor terminals are as follows:

YLW

4

HOOD
FAN
CAPACITOR

5

RED

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

COMPONENT TEST

BLU

1

Resistance between;

BLU (1) AND YLW (4) = 0 ohm(Shorted)
BLK (2) AND YLW (4) = 32 ohm

32

BLU (1) AN D BLK (2) = 32 ohm
BLK (2) AND WHT (3) = 20 ohm

2045

2

BLK

3

WHT

WHT (3) AN D RED (5) = 45 ohm

BLU BLK WHT

123

6-PIN CONNECTOR
OF HOOD FAN MOTOR

YLW RED

45

N DAMPER MOTOR TEST

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. When the power cord is plugged into the wall receptacle and 120 volts A.C. is supplied to the damper
motor, the motor operates until the damper is opened and the damper switch closes. Then the damper
motor stops operation.

5. If the damper motor does not operate, check for A.C. voltage with a voltmeter at the motor.

6. Disconnect the power cord from the wall receptacle.

7. Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness.

8. Re-connect the power cord into the wall receptacle.
If 120 volts A.C. is indicated at the wire leads, replace the motor and if 120 volts A.C. is not indicated,
check the wire harness and control unit.

9. Run the oven and check all functions.

O HEATING ELEMENT TEST

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. Make sure the heating element is fully cooled and test as follows;

a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the

resistance between the heating element terminals should be approximately 10 ohm.
Disconnect wire leads and measure the insulation resistance with 500V - 100M ohm insulation
resistance meter. The insulation resistance between heating element terminal and cavity should be
more than 0.5M ohm.

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

24

TEST PROCEDURES

R-1855A

PROCEDURE

LETTER

P CHECKING TEMPERATURE IN THE CONVECTION MODE

COMPONENT TEST

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. It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple
type temperature tester must be used. A low priced bi-metal type thermometer is not reliable or
accurate. The temperature should be checked with outer case cabinet installed, approx. 5 minutes
after preheat temperature is reached (audible signal sounds four times). The temperature experienced
may be approx. 30OF more or less than indicated on the display, however, in most cases the food
cooking results will be satisfactory. Difference in power supply voltage will also affect the oven
temperature.

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

Q 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 "HOOD
EXHAUST LOUVER REMOVAL", "REMOVAL OF OVEN FROM WALL" and "OUTER CASE
REMOVAL".

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.

1. Key Unit.
NOTE ;

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) Check key unit ribbon connection before replacement.

5) Reconnect all leads removed from components during testing.

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

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

8) 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.

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) Replace the key unit.

5) Reconnect all leads removed from components during testing.

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

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

8) Run the oven and check all functions.

25

R-1855A

TEST PROCEDURES

PROCEDURE

LETTER

Q TOUCH CONTROL PANEL ASSEMBLY TEST

2. Control Unit.
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure R) 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, and then remove outer case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

R KEY UNIT TEST

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. 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
(stop switch) is good, disconnect the flat ribbon 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 stop 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 after the outer case is installed.

8. Run the oven and check all functions.

G 8

G 9

G10

G11

G12

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

CUSTOM

CONVEC

KITCHEN

TURNTABLE

HELP

BROIL

TIMER

ON / OFF

SENSOR

REHEAT

PREHEAT

SLOW
COOK

CLOCK

POWER

LEVEL

START

SENSOR

COOK

COMPU
ROAST

FAN LIGHT

MINUTE

POPCORN

PLUS

LOW MIX

HIGH MIX

BAKE

ROAST

1

100°F2150°F3275°F4300°F5325°F

6

350°F7375°F8400°F9425°F0450°F

KEEP

WARM

CLEAR

STOP

COMPU

DEFROST

TOUCH ON

COMPU

BROIL

COMPU

BAKE

26

TEST PROCEDURES

R-1855A

PROCEDURE

LETTER

S RELAY TEST

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

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

7. Remove the outer case and check voltage between Pin No. 5 of the 3-pin connector (A) and the

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

COMPONENT TEST

tape.

common 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.

unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 24.0V D.C. Oven lamp
RY2(COOK) Approx. 24.0V D.C. Power transformer / Stirrer mootor
RY3 Approx. 24.0V D.C. Heating element
RY4 Approx. 24.0V D.C. Turntable motor
RY5 Approx. 24.0V D.C. Fan motor
RY6 Approx. 24.0V D.C. Damper motor
RY7 Approx. 24.0V D.C. Convection motor
RY8 Approx. 24.0V D.C. Hood lamp
RY9 Approx. 24.0V D.C. Hood motor
RY10 Approx. 24.0V D.C. Hood motor (HIGH / LOW selection)

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

9. Open the door and block it open.

10.Discharge high voltage capacitor.

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.

T COMPU DEFROST TEST

1. Place one cup of water in the center of the turntable tray in the oven cavity.

2. Close the door, touch the " COMPU DEFROST " pad four times.

3. Touch the number 5 pad.

4. Touch " START " pad.

5. The oven will operate as follows.
MENU WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE

(LBS) LEVEL TIME LEVEL TIME LEVEL TIME

CHICKEN 0.5 70% 28sec. 50% 5sec. 30% 1min.28sec.
PIECES

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

27

R-1855A

TEST PROCEDURES

PROCEDURE

LETTER

U

COMPONENT TEST

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.

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. 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 voltage is not applied between Pin

No. 5 of the 3-Pin connector (A) and the
terminal of the relay RY1.

2 The rated voltage is applied to primary side Power transformer or secondary circuit defective.

power 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 RFILN0027WRE0 between "c" and "d".

Check supply voltage and oven main unit.

NOTE:* At the timeof making these repairs,

make a visual inspection of the
varistor Check for burned damage
and examine the transformer with
an ohm-meter for the presense of
a layer short-circuit(check Primary
coil resistance which is approxi
mately 195 ohm ± 15%). If any
abnormal condition is detected,

replace the defective parts.

V 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 five minutes before sensor cooking.
(2) Room temperature should not exceed 95O F(35OC).
(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 ".

(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.

RY1

CN - B

P

21

T1

b

(J1)

d

a

VRS1

CN - A

c

AC (N) MOTOR

351

CAPACITOR

C100

28

TEST PROCEDURES

R-1855A

PROCEDURE

LETTER

COMPONENT TEST

Water load cooking test

Make sure the oven has been plugged in at least five 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 SENSOR COOK pad. And touch the number pad 1. And touch the start pad. The oven will

operate for the first 32 seconds, without generating microwave energy.

NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage of

sensor cooking.

(5) After approximately 32 seconds, microwave energy is produced, oven should turn off after water

is boiling (bubbling).

If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.

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 oven from power supply and remove outer case.
(2) Open the door and block it open.
(3) Discharge the high voltage capacitor.
(4) Remove the AH sensor.
(5) Install the new AH sensor.
(6) Reconnect all leads removed from the components during replacing.
(7) Re-install the outer case.
(8) Reconnect the oven to the power supply and check the sensor cook operation proceed 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 SENSOR COOK pad. And touch the number pad 1. And touch the start pad.
9-5. The oven will turn off automatically after the water is boiling (bubbling).

If new sensor dose not operate properly, the problem is with the control unit.

CHECKING CONTROL UNIT

(1) Disconnect oven from power supply and remove outer case.
(2) Open the door and block it open.
(3) Discharge the high voltage capacitor.
(4) Disconnect the wire leads from the cook relay.
(5) Disconnect the sensor connector that is mounted to lower portion of control panel.
(6) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(7) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:

7-1. Touch SENSOR COOK pad. And touch the number pad 1. And touch the start pad.
7-2. The control panel is in the sensor cooking operation.
7-3. After approximately 32 seconds, push plunger of select switch. This condition is same as
judgement by AH sensor.
7-4. After approximately 3 seconds, cooking operation turns off, an audible signal will sound,

and the display will then revert to the time of day.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.

R1,R2 : 22 ohm ± 1% 1/2W

R3 : 10k ohm ± 5% 1/4W

Sensor Dummy Resistor Circuit

To connector (F)
on Control Unit.

F-1
F-2

F-3

CONNECTOR

R4 : 1M ohm ± 5% 1/4W

1
2
3

R1

R3 R4

R2

COM

Plunger

NC
NO

COM

NO

NC

29

R-1855A

TEST PROCEDURES

PROCEDURE

LETTER

W NOISE FILTER TEST

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. Using an ohm-meter, check between the terminals as described in the following table:

NOISE FILTER UNIT

NOISE SUPPRESSION COIL

LINE CROSS CAPACI­TOR 0.22uF/ AC 250V

LINE BYPASS CAPACITOR

COMPONENT TEST

MONITOR
FUSE

LINE BYPASS CAPACITOR

0.0033uF/ AC
125V

GRY

0.0033uF/ AC
125V

RED

MEASURING POINT INDICATION OF OHM-METER

Between N and H Open Circuit
Between terminal N and GRY Short Circuit
Between terminal H and RED Short Circuit

If incorrect readings are obtained, replace the noise filter.

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. Run the oven and check all functions.

30

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

R-1855A

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 - P06.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through AN1 and
R24 - R27 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchro­nizing signal circuit, ACL circuit, buzzer circuit, temperature
measurement circuit, absolute humidity sensor circuit, relay
circuit and indicator circuit.

1) LSI

This LSI controls the temperature measurement signal,
AH sensor signal, 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.

Symbol Voltage Application

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) ACL 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) Temperature Measurement Circuit : Oven

The temperature in the oven cavity is sensed by the
thermistor. The variation of resistance according to sensed
temperature is detected by the temperature measure­ment circuit and the result applied to LSI. The LSI uses
this information to control the relay and display units.

7) Absolute Humidity Sensor Circuit

This circuit detects the humidity of a food which is being
cooked, to control its automatic cooking.

8) Door Sensing Switch

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

9) Relay Circuit

To drive the magnetron, heating element, fan motor,
convection motor, damper motor, turntable motor, hood
motor, and light the oven lamp and hood lamp.

VC -5.1V LSI(IC1)
VP -31V Fluorescent display tube : Grid

and anode voltage

VF1 2.9Vac Filament of fluorescent

display tube

VF2 (VF1 to VF2 voltage)

10) Indicator Circuit

Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a cath­ode, a grid and an anode. Usually, the cathode of a
Fluorescent Display is directly heated and the filament
serves as cathode.
The Fluorescent Display has 8-digits, 16-segments are
used for displaying figures.

31

R-1855A

ON

OFF

During
cooking

L

GND

H.

ON

OFF

H : GND

L

DESCRIPTION OF LSI

LSI(IZA719DR)

The I/O signals of the LSI(IZA719DR) are detailed in the following table.

Pin No. Signal I/O Description

1 VCC IN Connected to GND.
2 VEE IN Anode (segment) of Fluorescent Display illumination voltage: -31V.

Vp voltage of power source circuit input.

3 AVSS IN Power source voltage:-5V.

VC voltage of power source circuit input.

4 VREF IN Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)

5 AN7 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.

6 AN6 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.
7-9 AN5-AN3 IN Heating constant compensation terminal.
10 AN2 IN Input signal which communicates the door open/close information to LSI.

Door closed; "L" level signal(0V).

Door opened; "H" level signal(-5V).
11 AN1 IN Signal coming from touch key.

When any one of G8 line keys on key matrix is touched, a corresponding signal will from

P00 - P06 will be input into AN1. When no key is touched, the signal is held at "L" level.
12 AN0 IN Temperature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor,

this input is converted into temoerature by the A/D converter built into the LSI.
13 P55 OUT Segment data signals.

The relation between signals and indicators are as follows:

Signal Segment Signal Segment

P13 ...................P16 P03..................... P8

P12 ...................P15 P02..................... P7

P11 ...................P14 P01..................... P6

P10 ...................P13 P00..................... P5

P07 ...................P12 P37..................... P4

P06 ...................P11 P36..................... P3

P05 ...................P10 P35..................... P2

P04 .....................P9 P55..................... P1

(ß : INTO signal)

Refer to the touch control panel circuit about the relation between signals and

indicators. Normally, one pulse is output in every synchronized signal (ß) period, and

input to the anode of the fluorescent display.
14 P54 OUT Oven lamp driving signal. (Square Waveform : 60Hz)

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

waveform voltage is delivered to the relay(RY1) driv-

ing circuit.
15 P53 OUT Turntable motor driving signal.

To turn on and off relay(RY4). "L" level: During

Turntable ON. "H" level: During Turntable OFF or

during the oven is off condition.
16 P52 OUT Cooling fan motor driving signal.

To turn on and off shut-off relay(RY5). "L" level during

both microwave and convection cooking; "H" level

otherwise.
17 P51 OUT Damper motor driving signal.

To turn on and off shut-off relay(RY6).

32

ß(60Hz)

ON

16.7 msec.

During cooking

OFF

GND

VP

H

L

H : GND

L

R-1855A

ON

OFF

H : GND

L

ON

OFF

H : GND

L

Pin No. Signal I/O Description

18 P50 OUT Convection motor driving signal.

To turn on and off shut-off relay(RY7). "L" level during
CONVECTION; "H" level otherwise.

ON

During

cooking

(Convection)

OFF

H.

GND

L

19 P47 OUT Hood lamp driving signal.

To turn on and off relay(RY8). "L" level: During Hood
lamp ON. "H" level: During Hood lamp OFF.

20 P46 OUT Hood motor driving signal.

To turn on and off relay(RY9). "L" level: During Hood
motor ON. "H" level: During Hood motor OFF.

ON

OFF

H : GND

L

21 P45 OUT Hood motor high / low driving signal.

To turn on and off relay(RY10). "L" level: During Hood
motor high. "H" level: During Hood motor low.

22 P44 OUT Timing signal output terminal for temperature measurement(OVEN).

"L" level (GND): Thermistor OPEN timing.
"H" level (-5V): Temperature measuring timing. (Convection cooking)

23 P43 OUT Signal to sound buzzer.

A: key touch sound.
B: Completion sound.
C: When the temperature of the oven cavity reaches

the preset temperature in the preheating mode, or
when the preheating hold time (30 minutes) is elapsed.

0.1 sec

A

2 sec

B

1 sec

C

1 sec

24 P42 IN Input signal which communicates the damper open/close information to LSI.

Damper opened; "L" level signal(0V:GND).
Damper closed; "H" level signal(-5V).

25 INT1 IN Signal to synchronize LSI with commercial power source freqency.

This is the basic timing for all real time processing of LSI.

16.7 msec

H: GND

L

H : GND

L (-5V)

26 P40 IN Connected to VC.
27 RST IN Auto clear terminal.

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

28 P71 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook
relay(RY2). In P-HI operation, the
signals holds "L" level during mi­crowave cooking and "H" level
while not cooking. In other cooking
modes (P-90,P-80,P-70,P-60,P­50,P-40,P-30,P-20,P-10,P-0) the
signal turns to "H" level and "L"
level in repetition according to the
power level.

VARI-MODE ON TIME OFF TIME
P-HI (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.

29 P70 OUT Heating element driving signal.

To turn on and off shut-off relay(RY3). "L" level during convection cooking; "H" level
otherwise. During convection cooking, the signal becomes
"H" level when the temperature of the oven cavity exceeds
the predetermined temperature.

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.

33

ON

During

cooking

(Convection)

OFF

H.

GND

L

H

L

GND
VP

ß(60Hz)

P14

P15

P16

P17

P20

P21

P22

P23

R-1855A

Pin No. Signal I/O Description

31 XOUT OUT Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.
32 VSS IN Power source voltage:-5V.

VC voltage of power source circuit input.
33 P27 IN Signal coming from touch key.

When any one of G12 line keys on key matrix is touched, a corresponding signal will

be input into P27. When no key is touched, the signal is held at "L" level.
34 P26 IN Signal similar to AN1.

When any one of G11 line keys on key matrix is touched, a corresponding signal will

be input into P26.
35 P25 IN Signal similar to P27.

When any one of G10 line keys on key matrix is touched, a corresponding signal will

be input into P25.
36 P24 IN Signal similar to P27.

When any one of G9 line keys on key matrix is touched, a corresponding signal will be

input into P24.
37-40 P23-P20 OUT Digit selection signal.

The relationship between digit signal and digit are as

follows;

Digit signal Digit Digit signal Digit

P14 ........................... 1st. P20 .......................... 5th.

P15 ..........................2nd. P21 .......................... 6th.

P16 .......................... 3rd. P22 .......................... 7th.

P17 ........................... 4th. P23 .......................... 8th.

(ß : INTO signal)

Refer to the touch control panel circuit about the rela-

tion between signals and digits. Normally, one pulse is

output in every synchronized signal (ß) period, and

input to the grid of the fluorescent display.
41-44 P17-P14 OUT Digit selection signal. Signal similar to P23.
45-48 P13-P10 OUT Segment data signal. Signal similar to P55.
49 P07 OUT Segment data signal. Signal similar to P55.
50 P06 OUT Segment data signal. Signal similar to P55.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24

terminal while one of G7 line keys on key matrix is touched.
51 P05 OUT Segment data signal. Signal similar to P55.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24

terminal while one of G6 line keys on key matrix is touched.
52 P04 OUT Segment data signal. Signal similar to P55.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24

terminal while one of G5 line keys on key matrix is touched.
53 P03 OUT Segment data signal. Signal similar to P55.

54 P02 OUT Segment data signal. Signal similar to P55.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24

terminal while one of G4 line keys on key matrix is touched.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24

terminal while one of G3 line keys on key matrix is touched.
55 P01 OUT Segment data signal. Signal similar to P55.

34

Pin No. Signal I/O Description

SW1
SW2

SW3
SW4
SW5

P30

P31

P32
P33
P34

LSI

(IC1)

AN7

AN6

620k
300k
150k
75k

37.4k

4

5

5

6
7

8

6

60

61

62

63

64

3

2

47k

47k

10k

0.01uF

0.015uF

0.01uF

360k

+

-

1

12

VA : -15V

VA : -15V

R51

9

S

F-2

10

1.8k

F-1

F-3

C

11

3.57k

3.32k

VC : -5V

0.1

uF

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

IC2(IZA495DR)

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24
terminal while one of G2 line keys on key matrix is touched.

56 P00 OUT Segment data signal. Signal similar to P55.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24

terminal while one of G1 line keys on key matrix is touched.
57-59 P37-P35 OUT Segment data signal. Signal similar to P55.
60-64 P34-P30 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

ABSOLUTE HUMIDITY SENSOR CIRCUIT

R-1855A

(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 glass tube filled with dry air while another in
the open glass tube. Each sensor is provided with the
protective cover made of metal with holes to be protected
from the external airflow.

Sensing part

(Closed glass tube)

Sensing part

(Open glass tube)

(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 150OC (302OF), 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,
output voltage characterist

Absolute humidity (g/m )

R1

R2

Operational
amplifier

+

-

Output
voltage

S : Thermistor
open vessel

C : Thermistor
closed vessel

Output voltage

C

S

R3

(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, a 16 seconds clearing cycle
occurs. Then the detector circuit starts to function and
the LSI observes the initial voltage available at its AN6
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 R50-1. Changing the
resistance values results in that there is the same
potential at both F-3 terminal of the absolute humidity
sensor and AN7 terminal of the LSI. The voltage of AN6
terminal will indicate about -2.5V. This initial balancing
is set up about 16 seconds after the unit is put in the
Sensor Cooking mode. As the sensor cooking proceeds,
the food is heated to generate moisture by which the
resistance balance of the bridge circuit is deviated to
increase the voltage available at AN6 terminal of the LSI.
Then the LSI observes that voltage at AN6 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.
After 16 seconds of operation in the sensor cook mode,
the LSI detects the initial voltage at AN6. If the absolute
humidity sensor is open or shorted, the circuit can not
be balanced for initial voltage comparisons. This will
result in the word "error" on the display and the cooking
operation is stopped.

1) Absolute humidity sensor circuit

2

35

R-1855A

SERVICING

1. Precautions for Handling Electronic Components

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

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

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

approx. 1M ohm

2. Shapes of Electronic Components

Transistor
DTA123ES

Transistor
2SB1238

B

C

E

KRA101M
KRC101M
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
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 sensor­related controls of the touch control panel by using the
dummy resistor(s).

4. Servicing Tools

Tools required to service the touch control panel assem­bly.

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

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

3) Others: Hand tools

5. Other Precautions

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

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

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

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

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

36

R-1855A

Hood exhaust
louver

Tab (left )

Tab (right)

Push

Push

COMPONENT REPLACEMENT AND ADJUSTMENT PR OCEDURE

W ARNING AGAINST HIGH VOLTA GE:

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

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

1. Door does not close firmly.

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

3. The door gasket or seal is damaged.

4. The door is bent or warped.

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

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 following parts;

1) High voltage parts:

Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.

2) Hot parts:

Oven lamp, Magnetron, High voltage transformer
and Oven cavity.

3) Sharp edge:

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.

Bottom plate, Oven cavity, Waveguide flange,

Chassis support and other metallic plate.

4) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch, Switch lever, Open
button.

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

4. Insert the positive lock connector 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.

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

THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED

WITHOUT REMOVING THE OVEN FROM THE WALL

1. Hood lamps, sockets and grease filter.

2. Oven lamp, base cover and hood lamp glass assembly.

3. Turntable motor.

4. Hood exhaust louver.

5. Control panel assembly or components

6. Stirrer cover and stirrer fan.

HOOD EXHAUST LOUVER REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove the one (1) screw holding the hood exhaust
louver to the oven cavity with the outer case cabinet.

4. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.

5. Now, the hood exhaust louver is free.

37

R-1855A

REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven)

1. Disconnect the power supply cord, and uncoil the power
supply cord.

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

3. Remove the two (2) screws holding the oven (outer case
cabinet) to the top cabinet.

4. Remove the two (2) grease filters from the base cover.

5. While supporting the front of the oven, unfasten the two (2)
unit mounting screws holding the oven to the unit mounting

OUTER CASE REMOVAL

Remove the oven from the wall and proceed as follows;

1. Disconnect the power supply cord.

2. Open the door block it open.

3. Remove one (1) screw holding the hood exhaust louver to
the oven, and pull it forward to remove by pushing the right
and left tabs of the hood exhaust louver. (Refer to
procedure of "HOOD EXHAUST LOUVER REMOVAL".)

4. Remove four (4) screws holding the rear stay to the hood
fan motor or the oven, and remove it.

5. Remove the four (4) screws from the rear of the outer case
cabinet.

UNIT MOUNTING SCREW AND HOOD INTAKE DUCT R REMOVAL

1. Disconnect the power supply cord and remove the oven
from the wall and remove the outer case of the oven.

2. Open the door block it open.

3. Bend the tab of the oven cavity back plate.

4. Lift the unit mounting screw off the tab.

5. Slide down it from the base plate right. Now , the unit
mounting screw is free.

POWER TRANSFORMER REMOVAL

1. Disconnect the power supply cord and remove the oven
from wall, remove outer case, remove the unit mounting
screw and hood intake duct R. (Refer to procedure of
"Removal of Oven from Wall", "Outer Case Removal" and
"Unit Mounting Screw and Hood Intake Duct R Removal".)

2. Open the door block it open.

3. Discharge high voltage capacitor.

4. Disconnect filament leads of transformer from the
magnetron and capacitor.

5. Disconnect high voltage leads of capacitor from the
transformer.

6. Disconnect wire leads from transformer.

7. Remove two (2) screws holding the transformer to base

plate.

6. Lower the front of the oven and pull the power cord out of
the wall cabinet.

7. Lift the oven up off the hooks at the bottom of the mounting
plate.

8. The oven is now free and can be placed on the work
surface selected for servicing the oven.

9. Installation is the reverse of this procedure.

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

7. Disconnect the three (3) pin connector of the power supply
cord from the wiring harness and remove the power supply
cord together with the outer case.

8. Discharge high voltage capacitor.

CAUTION: 1. DISCONNECT OVEN FROM POWER

SUPPLY BEFORE REMOVING OUTER
CASE.

2. DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.

6. Remove the three (3) screws holding the hood intake duct
R to the base plate right, fan duct and the oven cavity.

7. Slide the hood intake duct R out of the right side of the
oven.

8. Now the hood intake duct R is free

9. Discharge the high voltage capacitor.

plate right.

Re-install

1. Rest the transformer on the base plate right with its
primary terminals toward the control panel.

2. Secure the transformer with two (2) screws to base plate
right.

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

4. Re-install the hood intake duct R, and the outer case and

5. check that oven is operating properly.

CAUTION: MAKE SURE THE WIRE LEADS NEVER TOUCH

THE FAN BLADE.

HOOD FAN MOTOR, HOOD EXHAUST DUCT AND OVEN LAMP SOCKET AND AH SENSOR REMOVAL

1. Disconect the power supply 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. Disconnect the 6-pin connector of the hood fan motor from
the main wire harness located at the right edge of the hood
exhaust duct.

4. Disconnect the connector CN-F from the control unit.

5. Remove three (3) screws holding the hood exhaust duct
to the oven cavity.

6. Remove two (2) screws holding the hood exhaust duct to
the exhaust duct.

7. Release the 6-pin connector and the 3-pin connector of the
main harness A from the hood exhaust duct.

8. Release the one (1) snap band of the main harness A from
the left edge of the hood exhaust duct.

9. Release the snap band of the wire cord of the hood fan
motor from the hood exhaust duct.

38

R-1855A

10.Now, the hood fan motor is free.

11.Remove the hood exhaust duct from the oven cavity by
lifting it up

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

13.Remove the lamp socket from the lamp angle of the top
duct by releasing the two (2) tabs of the oven lamp socket.

14.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.

15.Now, the oven lamp socket is free.

16.Release the one (1) snap band of the AH sensor
assembly from the oven cavity.

17.Release the one (1) tab of the top duct from the AH
sensor assembly.

MAGNETRON REMOVAL

1. Disconnect the power supply cord, remove the oven from
wall, remove outer case, remove the unit mounting screw
and hood intake duct R. (Refer to procedure of "Removal
of Oven from Wall", "Outer case Removal" and "Unit
Mounting Screw and Hood Intake Duct R Removal".)

2. Open the door block it open.

3. Discharge high voltage capacitor.

4. Remove the hood fan motor and the hood exhaust duct
from the oven cavity, referring to the procedure of
"HOOD FAN MOTOR, HOOD EXHAUST DUCT, OVEN
LAMP SOCKET AND AH SENSOR REMOVAL".

5. Disconnect the high voltage wire leads of the high voltage

18.Remove two (2) screws holding the AH sensor assembly
to the exhaust duct.

19.Now, the AH sensor assembly and the exhaust duct are
free.

Oven lamp
socket

Terminal

Wire lead

Terminal hole

Flate type small
screw driver

rectifier assembly from the magnetron.

6. Disconnect the filament lead of the transformer from the
magnetron.

7. Carefully remove the four (4) mounting screws holding the
magnetron to waveguide. When removing the screws hold
the magnetron to prevent it from falling.

8. Remove the magnetron from the unit with care so the
magnetron tube should not hit by any metal object around
the tube.

CAUTION: WHEN REPLACING THE MAGNETRON, BE

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

HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL

1. Disconnect the power supply cord, remove the oven
from wall, remove outer case, remove the unit mounting
screw and hood intake duct R. (Refer to procedure of
"Removal of Oven from Wall", "Outer case Removal"
and "Unit Mounting Screw and Hood Intake Duct R
Removal".)

2. Open the door block it open.

3. Discharge high voltage capacitor.

4. Disconnect the high voltage wire leads with high voltage
rectifier from the magnetron.

5. Disconnect filament lead of the transformer from high
voltage capacitor.

6. Disconnect high voltage wire lead of capacitor from the

HOOD FAN THERMAL CUT-OUT REMOVAL

1. Disconnect the power cord, 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. Discharge high voltage capacitor.

TEMPERATURE FUSE (MAGNETRON) 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")

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Remove the hood fan motor and the hood exhaust duct
from the oven cavity, referring to the procedure of "

transformer.

7. Remove one (1) screw holding capacitor holder to the
back plate.

8. Remove one (1) screw holding high voltage rectifier from
the capacitor holder.

9. Disconnect the high voltage rectifier assembly from the
high voltage capacitor.

10.Now, the high voltage rectifier assembly is free.

11.Remove capacitor from the holder.

12.Now, the high voltage capacitor is free.

CAUTION: WHEN REPLACING THE HIGH VOLTAGE REC-

TIFIER ASSEMBLY, THE GROUND SIDE TER­MINAL MUST BE SECURED FIRMLY WITH A

4. Disconnect the wire leads from the hood fan thermal cut­out.

5. Remove the hood fan thermal cut-out from the base plate
right.

6. Now, the hood fan thermal cut-out is free.

5. Disconnect the wire leads from the temperature fuse
(Magnetron).

6. Remove the one (1) screw holding the temperature fuse
(Magnetron) to the oven cavity.

7. Now, the temperature fuse (Magnetron) is free.

39

R-1855A

GROUNDING SCREW.

COOLING FAN MOTOR REMOVAL

1. Disconnect the power supply cord, remove the oven
from wall and remove outer case, remove the unit
mounting screw and hood intake duct R. (Refer to
procedure of "Removal of Oven from Wall", "Outer case
Removal" and "Unit Mounting Screw and Hood Intake
Duct R Removal".)

2. Open door and block it open.

3. Discharge high voltage capacitor.

4. Remove the hood fan motor and the hood exhaust duct
from the oven cavity, referring to the procedure of " HOOD
FAN MOTOR, HOOD EXHAUST DUCT, OVEN LAMP
SOCKET AND AH SENSOR REMOVAL".

5. Discharge high voltage capacitor.

6. Release the two (2) snaps of the magnetron duct from the
oven cavity. And remove the two (2) tabs of the magnetron
duct from the fan duct.

7. Release snap bands of the main harness A installed to the
fan duct and nearest the fan duct.

8. Disconnect the wire leads from the fan motor.
duct.

12.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. Install the fan duct assembly to the oven cavity with the
one (1) screw.

4. Install the magnetron duct to the fan duct and oven cavity.

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

6. Reinstall the released snap bands of the main harness A
to the fan duct and nearest the fan duct.

7. Refer to procedure of "HOOD FAN MOTOR, HOOD
EXHAUST DUCT, OVEN LAMP SOCKET AND AH
SENSOR REMOVAL" and "Unit Mounting Screw and
Hood Intake Duct R Removal" and "Outer case Removal".
And reverse their procedure.

9. Remove one (1) screw holding the fan duct assembly to
oven cavity.

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

11.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 groove joint pliers.

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

between the rotor and the startor 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.

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

Rear View

Coil

Stator

Gap
Bracket

Axis

Rotor

Shaft

Stator

Rotor

Groove joint pliers

These are the areas
that should be held
with a pliers

Side View

Table

Shaft

Center of
bracket

40

TURNTABLE MOTOR AND COUPLING REMOVAL

R-1855A

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove the three (3) screws holding the base cover to the
oven cavity

4. Remove the base cover from the oven cavity by pulling
down and moving to the left slightly.

STIRRER MOTOR 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. Discharge high voltage capacitor.

4. Remove the hood fan motor and the hood exhaust duct
from the oven cavity, referring to the procedure of " HOOD
FAN MOTOR, HOOD EXHAUST DUCT, OVEN LAMP
SOCKET AND AH SENSOR REMOVAL".

STIRRER COVER AND STIRRER FAN INSTALLATION

1. Insert the shaft of stirrer fan to the shaft of stirrer motor.

2. Hold the stirrer fan not to come out from the shaft of stirrer
motor.

3. Insert the cutout of stirrer cover to the tabs on the ceiling.

4. Put the stirrer fan on the stirrer cover to match the stirrer
fan shaft to the center of the stirrer support.

5. Hold the stirrer cover to the oven cavity with the two (2)
screws.

5. Disconnect the wire leads from the turntable motor.

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

7. Now the turntable motor is free.

8. Pull the coupling out of the turntable motor packing which
is installed on the oven cavity floor.

9. Now the coupling is free.

5. Disconnect the wire leads from the stirrer motor.

6. Remove the two (2) screws holding the stirrer motor to the
waveguide of the oven cavity.

7. Remove the stirrer motor from the waveguide.

8. Now, the stirrer motor is free.

9. When install the stirrer motor, the shaft of stirrer motor
must be inserted to the stirrer fan shaft. Refer to the
procedure of "STIRRER COVER AND STIRRER FAN
INSTALLATION".

Shaft

Stirrer fan

Stirrer
support

Stirrer

Screws

cover

NOISE FILTER REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

OVEN LAMP REMOVAL

1. Disconnect the power supply cord.

2. Remove one (1) screw holding the hood exhaust louver to
oven cavity front flange.

3. Remove the hood exhaust louver from the oven by
pushing the right and left tabs of the hood exhaust louver.
(Refer to procedure of "HOOD EXHAUST LOUVER
REMOVAL")

CONTROL PANEL ASSEMBLY, CONTROL UNIT AND KEY UNIT REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove one (1) screw holding the hood exhaust louver to
oven cavity front flange.

4. Remove the hood exhaust louver from the oven by
pushing the right and left tabs of the hood exhaust louver.
(Refer to procedure of "HOOD EXHAUST LOUVER
REMOVAL")

5. Open the oven door.

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

7. Release the control panel from the oven cavity front face

4. Disconnect the wire leads from the terminals of the noise
filter .

5. Remove one (1) screw mounted into the noise filter
bracket.

4. Lift the oven lamp cover up.

5. Now, the oven lamp and the socket are found.

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

7. Now, the oven lamp is free.

NOTE: HOT (ORANGE) WIRE MUST BE CONNECTED

TO THE TERMINAL WITH BLUE MARKING ON
LAMP SOCKET.

plate by lifting it up.

8. Disconnect the wire leads from the relays RY1, RY2 and
RY3.

9. Disconnect the connectors CN-A, CN-B CN-C, CN-E and
CN-F from the control unit.

10. Remove the control panel assembly from the oven.

11.Now, the control panel assembly is free.

12.Remove four (4) screws holding the control unit to the
control panel.

13.Release the two (2) tabs holding the control unit to the
control panel.

14.Now, the control unit is free.

41

R-1855A

15.Remove the one (1) screw holding the key fixing plate to
the control panel.

16.Release the four (4) tabs holding the key fixing plate to the
control panel.

17.Remove the key fixing plate from the control panel.

18.Tear the key unit from the key fixing plate.

19.Now, the key unit is free

NOTES FOR KEY UNIT REPLACEMENT

1. Do not reuse the torn key unit because the performance
of the adhesive becomes weak.

2. Before attaching a new key unit, wipe off remaining
adhesive on the key fixing plate surfaces completely with
a soft cloth soaked in alcohol.

3. When attaching the key unit to the key fixing plate, adjust
the upper edge and right edge of the key unit to the correct
position of key fixing plate.

4. Stick the key unit firmly to the key fixing plate by rubbing
with soft cloth not to scratch.

NOTES FOR NEW CONTROL UNIT REPLACE­MENT

1. Before installation of the new CPU into the control panel,
grasp the middle section between thump and finger, bend
the display board forward a until "b" breaks as shown in
step 1.

2. To remove the middle section push both sides of the
middle section towards "d" until "c" breaks as shown in
step 2.

NOTE: Discard the middle section.

3. After removing the middle section, bend the display
board 90O, positioning the jumper wires into the notches
of the display board as shown in step 3.

4. Insert the bottom edge of the display board under the tab
of control panel as shown in step 4.

5. PLace the top edge of the display board on the clip (F).
And press the display board downward as shown in step

4. (Holes in middle of display board should be positioned
into locator pins.)

6. After installing display board, press the CPU downward
90O until CPU is locked into place by the clips.

7. Hold the CPU with the four (4) screws.

8. After installing CPU, make sure jumper wires are not
bent, touching or broken.

Top edge of the display board

Display
Board

Middle
section

LSI

Control Unit

CN-G

b
c

Break
point

Jumper
wires

a

b

Middle
Section

d

c

Notches

STEP 1 STEP 2 STEP 3 STEP 4

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) 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. Discharge high voltage capacitor.

4. Pull down on the positive lock® connector.

5. Push the lever of positive lock

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

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

®

Jumper
wires

Control
panel

®

Clip (E)

Positive lock®
connector

Lever

Clip (F)

Locator pin

Terminal

1

Push

2

Pull down

Positive lock®connector

42

Long nose plier

Heating element
holder

Heating
element

CONVECTION DUCT ASSEMBLY REMOVAL

R-1855A

1. Disconnect 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")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Lift the left mounting screw off the tab and slide it down
from the base plate left.

5. Remove the one (1) screw holding the exhaust duct to the
top duct.

6. Remove the exhaust duct from the oven cavity.

7. Remove the heat protect top sheet from the top duct.

8. Remove the two (2) screws holding the hood intake duct
L to the heater cover L and the oven cavity front flange.

9. Disconnect the wire leads from the convection motor
and heater element.

10.Disconnect the connector of the main wire harness A
from the connector of the thermistor.

THERMISTOR REMOVAL

11.Remove one (1) screw holding the thermistor to the
convection duct.

12.Now, the thermistor is now free.

CONVECTION HEATER REMOVAL

13.Remove six (6) oven side screws holding the convection
duct to the oven cavity.

14.Remove two (2) screws holding the convection duct to the
oven cavity top side.

15.Remove two (2) screws holding the two heater mounting
holders to the convection duct.

16.Remove two (2) screws holding the convection heater to
the convection duct.

17.Now, the convection heater is now free.

NOTE: After installed the heating element completely,

bent top of the heating element holder to inside
using by long nose pliers as shown following
illustration.

CONVECTION FAN AND MOTOR REMOVAL

18.Remove one (1) nut (turn to clockwise), spring washer and
washer holding the convection fan to the convection
motor shaft.

19.Now, the convection fan is now free.

20.Remove two (2) washers and pipe holding the convection
motor fan to convection motor shaft.

21.Remove two (2) screws holding the convection motor
mounting plate to convection duct.

22.Remove the convection motor assembly, convection
motor fan and one (1) washer from the convection duct.

23.Remove the convection motor fan and one (1) washer
holding the fan to convection motor shaft.

24.Remove the E-ring from the convection motor shaft.

25.Remove two (2) screws holding the convection motor to
convection motor mounting plate.

26.Now, the convection motor is free.

DAMPER MOTOR AND DAMPER SWITCH REMOVAL

1. Disconnect the power supply, remove the oven from
wall, remove outer case, remove the unit mounting
screw and hood intake duct R. (Refer to procedure of
"Removal of Oven from Wall", "Outer case Removal"
and "Unit Mounting Screw and Hood Intake Duct R
Removal".)

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect wire leads from damper motor and damper
switch.

5. Remove one (1) screw holding damper motor to damper
motor angle and bend the tab holding damper switch to
damper motor angle.

6. Damper motor and switch are free.

DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH, THIRD DOOR SWITCH AND MONITOR

SWITCH 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. Discharge high voltage capacitor.

4. Remove the hood fan motor and the hood exhaust duct
from the oven cavity, referring to the procedure of " HOOD
FAN MOTOR, HOOD EXHAUST DUCT, OVEN LAMP
SOCKET AND AH SENSOR REMOVAL".

5. Remove the control panel assembly, referring to the
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".

6. Bend the tab of the oven cavity face plate which prevent
the open lever from coming out.

7. Remove the open lever from to the oven cavity.

8. Remove the two (2) screws holding the latch hook to the
oven cavity front flange.

9. Remove the latch hook from the oven cavity front flange.

10.Disconnect the wire reads of each switch.

11.Remove each switch from the latch hook with pushing the
one (1) stopper tub holding each switch.

12.Now, each switch is free.

Re-install

1. Re-install open lever and each switch in its place. The

43

R-1855A

And install the hood intake duct R, hood exhaust duct
and outer case.

diagram.

3. Secure the latch hook (with two (2) mounting screws) to
oven cavity front 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".

DOOR SENSING SWITCH, SECONDARY INTERLOCK, THIRD DOOR SWITCH AND MONITOR SWITCH ADJUSTMENT

If the door sensing switch, secondary interlock switch, third
door switch and monitor switch do not operate properly due
to a misadjustment, the following adjustment should be
made.

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. Discharge high voltage capacitor.

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

5. 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 door sensing switch,
secondary interlock switch and third door switch are
activated with the door closed. The horizontal position
of the latch hook should be adjusted so that the monitor
switch is activated with the door closed.

6. Secure the screws with washers firmly.

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

and third door 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.)

LATCH HOOK

LATCH
HEADS

DOOR SENSING
SWITCH

MONITOR FUSE

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 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 door sensing switch, secondary interlock switch

DOOR REPLACEMENT

DOOR ASSEMBLY REMOVAL

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

2. Remove one (1) screw holding the hood exhaust louver
to the oven cavity with outer case cabinet, as shown in
Figure C-2.

3. Remove the hood exhaust louver from the oven cavity
by pushing right and left tabs of the hood exhaust louver,
as shown in Figure C-2.

4. Remove the sash left from the oven cavity from face
plate by lifting it up.

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

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

7. Lift up the door stopper.

MONITOR
SWITCH

THIRD

DOOR

OPEN LEVER

SECONDARY
INTERLOCK
SWITCH

DOOR
SWITCH

Figure C-1. Latch Switch Adjustments

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

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

10.Now, the door assembly is free.

Note: When the individual parts are replaced, refer to

"Door Disassembly".

DOOR ASSEMBLY RE-INSTALL

1. On re-installing 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.

44

R-1855A

RE-INSTALL

RE-INSTALL

Lower Door
Hinge Pin

Upper Door

Hinge Pin

Upper
Oven
Hinge

Lower
Oven
Hinge

Door
Assembly

Door
Stopper

Latch
Heads

Tab

Hood Exhaust Louver

Tab

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

7. Re-install the sash left to the oven cavity front face plate.

8. Re-install the hood exhaust louver to the oven cavity front
face plate.

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

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

as an electronic seal preventing the leakage of

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

Figure C-2. Door Replacement and adjustment

DOOR DISASSEMBLY

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. Discharge high voltage capacitor.

4. Remove the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver.
(Refer to the procedure of "HOOD EXHAUST LOUVER
REMOVAL".)

5. Remove door assembly, refer to "Door Replacement".
Replacement of door components are as follows:

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

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

are provided at 17 places, do not force any particular part.

CHOKE COVER

7. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door panel and between
the choke cover and the door frame as shown Figure C­3 to free engaging parts.

8. Try the principles of the lever and lift up the choke cover
by inserting a putty knife in order shown in Figure C-3.

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

DOOR FRAME

10.Remove six (6) screws holding the door panel to the door
frame assembly.

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

12.Now, door frame assembly is free.

LATCH SPRING, LATCH HEAD AND DOOR PANEL

13.Lease the latch spring from the tab of the latch head and
tab of the door panel.

14.Release the latch head from the door panel.

15.Now, the latch spring, latch head and door panel are free.

Door stopper

7

8

10

Putty Knife

Choke Cover

Bent

1

Choke Cover

17

16

A

6

14

5

11

12

Door Frame

4

3

2

13

15

Figure C-3. Door Disassembly

DOOR GLASS FRONT

11.Remove the glass stopper from the door frame.

12.Release the door glass front from the long tab of the door
frame.

13.Now, the door glass front is free.

45

9

H

G

F

E

D

C

B

A

R-1855A

1

CN-E

2

RY2:Primary Interlock Relay

IC1

CN-G

CN-E

CN-C

RY7

CN-F

RY9
RY10
RY8

RY6

CN-B

RY5

RY1

RY4

3

46

45

BLK

WHT

NOISE FILTER

BOARD

6

H

RY3

RY2

GRY

CN-F

T1

N.O.

N.O.

N.O.

COM.

COM.

COM.

CN-A

CN-C

CN-B

RED RED

CN-A

3

WHT

2

RED

CN-F

1

BLK

BLK

6

BLK

5
4

WHT

3

BRN

2

GRN

1

PNK

to oven cavity
front flange

RED

PPL
BRN

GRY

BLU

9

BRN
8
7

PPL

6

BLU

5
4
3

BLK

2

1

PNK
7

GRY
6

BLU

5
4
3

PPL

2

1

WHT
5

ORG

4

YLW

3
2
1

RED

G

PPL

WHT
WHT

WHT

BRN

GRN

GRN
GRN

AH. SENSOR

COM.

DOOR SENSING SWITCH

N.C.

COM.

SECONDARY
INTERLOCK
SWITCH

F

BLK

N.O.

PNK
GRN

YLW

RED

MONITOR
FUSE AND
FUSE HOLDER

RED

BLK

BLU

COM.

MONITOR
SWITCH

N.O.

BLK

ORG

Figure S-1. Pictorial Diagram

E

THIRD
DOOR
SWITCH

COM.

YLW
RED

BLU
PPL

GRY

STIRRER MOTOR

BLK

WHT

Blue
Marking

DAMPER
SWITCH

BRN
WHT

YLW

R

E

D

N.O.

RED

D

6

RED

5
4

YLW

3

WHT

2

BLK

1

BLU

TEMPERATURE FUSE (MG.)

ORG
WHT

OVEN LAMP & SOCKET

COM.

N.O.

B

B

P

L

R

N

K

N

K

HOOD FAN
THERMAL
CUT-OUT

HOOD FAN MOTOR

O

R

R

E

G

D

DAMPER
MOTOR

ORG

BLU

FAN
MOTOR

ORG

PPL

P

B

N

R

K

N

NOISE

RESISTOR

TURNTABLE
MOTOR

C

W

WHT

BLK

Y
L

B
R
N

THERMAL
CUT-OUT

3

BLK

BLK

2

WHT

WHT

1

GRN

GRN

ORG

BLK
GRY

BLK
BLK

Power Supply
cord 120V 60Hz

CONVECTION
MOTOR

RED
ORG

2

BLK

1

BLK

THERMISTOR

HEATING
ELEMENT

HIGH VOLTAGE COMPONENTS

WHT
RED

GRY
BRN

MAGNETRON

F

FA

B

POWER TRANSFORMER

HIGH VOLTAGE
CAPACITOR

2

GRY

GRY-GRY

1

BRN-BRN

PNK

HOOD LAMPS
& SOCKETS

Blue Marking

H.V.
RECTIFIER

GRY
BRN

A

1

2

3

45

6

H

G

F

E

D

C

B

A

1

AC120V
60Hz

MOTOR RUN

2

3

CAPACITOR

TURNTABLE
MOTOR

FAN MOTOR

DAMPER
MOTOR

CONVECTION
MOTOR

HOOD LAMP

A5

A1
A3

B1

B3

B5

B7

C1

47

COM

C3

LOW
HIGH

COM

C9

C7
C5

NO

COM

NO

COM

NO

COM

45

HOOD THERMO
HOOD MOTOR

OVEN LAMP

MICRO

CONVECTION
HERTER

6

H

(J1)

T1

2

5

6

10G471K

d
a

C100

RY4

RY5

RY6

RY7

1

D1-D4 : 11ES1

D1

3

4

D2

D20D21D22D23D24D25D26D27D28

D4

D3

+
–

C1 0.1µ/50v

C2 1000µ/35v

Q20 KRA101M

Q21 KRA101M

Q22 KRA101M

Q23 KRA101M

1/2w

R1 4.3k

ZD1

HZ6A3

ZD2

R2 1.5k

Q1 2SB1238

R3 680 1w

HZ16-1

SP40

+
–

C4 10µ/35v

C3 0.1µ/50v

R4 510 1/2w

R40 3.3k

ZD3 HZ5C2

C5 0.1µ/50v

Q3
KRA101M

C9

0.1µ/50v

Q40
KRA101M

(J2)

VRS1

b

c

RY8

Q24 KRA101M

RY9

Q25 KRA101M

RY10

RY1

RY2

RY3

D29

Q26 KRA101M

Q28 KRA101M

D32

Q29 KRA101M

Q27
KRC243M

–
+

C20 10µ/35v

–
+

C21 0.1µ/50v

Q30
KRA101M

C30

R30 15k

R31 4.7k R62 36kF

C50 C60

R50 15k

R51 4.7k

D31

D30

E4E3E2E1

DOOR
SWITCH

DAMPER
SWITCH

+
–

C6 10µ/35v

(J4)

CONTROL UNIT

ZD4

HZ4A2

R8 4.7k

(J6)

(J3)

R64 3.6kF

R63 220F

OVEN
THERMISTOR

Q4
DTA123ES

C8

(J5)

(J7)

Q60
KRC101M

C7

R7 4.7k

CF1 4MHz

(A) (B) (C)

AH SENSOR

C10 0.1µ/50v

R90 100k

Q90 KRA101M

VCC

VEE
AVSS
VREF

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

P55

P54

P53

P52

P51

P50

P47

P46

P45

P44

P43

P42

INT1

P40

RST

P71

P70

XIN
XOUT

VSS

F3

F2F1E6E5

(VP)

IC2 IZA495DR

1

P30
P31
P32
P33
P34
P35
P36
P37
P00
P01
P02
P03
P04
P05
P06
P07
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22

IC1 IZA719DR

P23
P24
P25
P26
P27

R75 100k

C74 330pF

C73 330pF

C72 330pF

C71 330pF

C70 330pF

R71 3.3k

R70 3.3k

R72 3.3k

R73 3.3k

NOTE

: IF NOT SPECIFIEED, 1/4w ± 5%
: IF NOT SPECIFIEED, 1SS270A
: IF NOT SPECIFIEED, 0.01µF/16v

FLUORESCENT DISPLAY TUBE

1, 2

F

MIX CONV

31, 32

F

DEFROST

4

P1

SENSOR
TURNTABLE

12

(VP)

R100 330 1w

R92 100k

R91 100k

(A)

(B)(C)

R76 3.3k

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

R74 3.3k

CUSTOM

G 8

HELP

CONVEC

G 9

BROIL

G10

KITCHEN

G11

TIMER

TURNTABLE

G12

ON / OFF

ON OFF COOK LBS OZ KG HELP

678

9

1011121315161718192023222425262728

P2 5

P3P4P5P6P7P8P9

P10

P11

R93 100k

R78 3.3k

D70

SENSOR
REHEAT

PREHEAT

SLOW
COOK

CLOCK

POWER

LEVEL

R77 3.3k

D71

R79

D72

MINUTE

POPCORN

PLUS

LOW MIX

HIGH MIX

BAKE

ROAST

1

100˚F2150˚F3275˚F4300˚F5325˚F

6

350˚F7375˚F8400˚F9425˚F0450˚F

STOP

KEEP

WARM

CLEAR

KEY UNIT

P12

P13

P14

P15

P161G2G3G4G5G6G7G8G

3.3k

3.3k

R80

D73

COMPU

DEFROST

START

TOUCH ON

R81

D74

SENSOR

COOK

COMPU
ROAST

FAN LIGHT

3.3k

D75

R82 3.3k

COMPU

BROIL

COMPU

BAKE

1

2

29

3

45

D76

6

R-1855A

Figure S-2. Touch Control Panel Circuit

G

F

E

D

C

B

A

R-1855A

1

2

3

45

A

R

0

6

A

TAPE

B

C

D

QKITPB023MRE0

E

HOOD

THERMO

F

H / M

LOW

H / M

HIGH

COM HOOD

LAMP

13579

G

RY7

D70
D71
D72
D73
D74
D75
D76

1

CN - G

12

(G)

1

70

(JA)

CN - C

28

27

2

IC2

R76
R77
R78
R79
R80
R81

R82

R70
R71
R72

R73

50

R75

R51

R74

C74
C73
C72
C71

C70

57

RY9

RY10

RY8

RY6

CONVMDAMP

1

26

C12

(J2)

CN - F

M

R93

60

(J4)

6

3

1

RY5

R92

(J6)

Q26

R62

B

(J9)

R91

E

R100

1

(J7)

B

Q25

59

20

2122232425

19

17

18

16

34

35

12

36
37

R4

41

C11

C30

(J3)

(J5)

C60

(C65)

R31
R30

B

R64

CN - E

D25

3157

Q24

B

Q20

D24

B

D26

EEE

E

Q23

67

B

B

68

RY4

T T MFAN.M

Q60

D31

R63

C2

R50

1

D30

(G)

51

52
53

55

56

54

E

B

Q3
C9

ZD2

65

B

R2

R3

E

66

Q22

E

E

Q21

D23

D22

D20D21

T1

CN - B CN - A

1413121110

15

69
29
30
31
32
33

,BFB

43

39

44

(D65)

(R65)

C8

(J8)

45

47

E

49

R8

Q28

B

Q27

B

C2

64

Q1

4356

S1 S2

2

(J1)

R7

C50

B

ZD4

B

B

D29

E

EE

Q29

C20

B

Q30

D28

E

58

D27

62

D4

D1

D2

ZD1

D3

P

AC (N) MOTOR

32

9876543

C7

CF1

46

E

Q4

48

61

C1

R1

C3

1

VRS1

CAPACITOR

DIP

3364

32

63

1

40

D32

IC1

C4

RY1

B

135

ZD3

C100

RY3

R90

C6

RY2

Q90

E

C5

E

Q40

42

R40

CONV. H

OVEN
LAMP

B

38

C10

SP40

MICRO

AC
(H)

H

B

C

D

E

F

G

H

Figure S-3. Printed Wiring Board

1

2

3

45

6

48

R-1855A

P AR TS 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-DZB010MRY0 M High voltage rectifier assembly 1 AM

*

1- 2 RC-QZB011MRE0 M High voltage capacitor 1 AR

*

1- 3 QFS-TA013WRE0 M Temperature fuse 150
1- 4 RHET-A174WRE0 M Convection heater 1 AZ
1- 5 RMOTDA211WRE0 M Turntable motor 1 AQ

1- 6 RMOTDA214WRE0 M Stirrer motor 1 AQ
1- 7 RTHM-0044MRE0 M Thermal cut-out N.O. 60OC 2AG
1- 8 RTRN-B063MRE0 M Power transformer 1 AZ

*

1- 9 RV-MZA255WRE0 M Magnetron 1 BE

∆

*

1-10 QFSHDB003MRE0 M Fuse holder 1 AD
1-11 QSW-MA110WRE0 M Sec.interlock,third door,sensing and damper switches 4 AE

1-12 FFS-BA018/KIT M Monitor and sec. interlock switch with fuse assembly 1 AF
1-13 FACCDB011MRE0 M Power supply cord 1 AP
1-14 QSOCLB006MRE0 M Hood lamp socket 2 AE
1-15 FH-HZA053WRE0 M Thermistor 1 AP

1-16 QSOCLB006MRE0 M Oven lamp socket 1 AE
1-17 FMOTEA362WRK0 M Hood fan motor 1 BM
1-18 RMOTEA343WRE0 M Convection motor 1 AX
1-19 RMOTEA344WRE0 M Fan motor 1 AW
1-20 RLMPTA077WRE0 M Hood lamp and oven lamp 3 AG

1-21 FDTCTA171WRK0 M AH sensor 1 AW
1-22 RMOTDA217WRE0 M Damper motor 1 AP
1-23 RR-WZA031WRE0 M Noise resistor 1 AK
1-24 FPWBFB014MRK0 M Noise filter 1 AU

CABINET PARTS

2- 1 PFIL-B002MRE0 M Grease filter 2 AF
2- 2 PDIF-B011MRF0 M Hood exhaust louver 1 AV
2- 3 GDAI-B052MRP0 M Base plate right 1 AL
2- 4 GDAI-B039MRP0 M Base plate left 1 AH
2- 5 GCABUB065MRP0 M Outer case cabinet 1 BC

2- 6 TMAPCB058MRR0 M Schematic diagram (Refer to page 11) 1 AB
2- 6 TMAPCB063MRR0 M Schematic diagram (Refer to page 13) 1 AB
2- 7 FANGKB009MRY0 M Hood lamp glass assembly 1 AN
2-7-1 LANGQB016MRP0 M Hood lamp glass angle 1 AG
2-7-2 PGLSPB004MRE0 M Hood lamp glass 1 AH

2- 8 PCOVPB051MRE0 M Base cover 1 AX
2- 9 HDECQB016MRF0 M Sash left 1 AL
2-10 LSTY-B010MRP0 M Rear stay 1 AG

CONTROL PANEL PARTS

3- 1 DPWBFB061MRU0 M Control unit 1 BQ
3- 1A QCNCMA227DRE0 J 3-pin connector CN-A 1 AC
3- 1B QCNCMA230DRE0 J 4-pin connector CN-B 1 AC
3- 1C QCNCMA234DRE0 J 5-pin connector CN-C 1 AC
3- 1D QCNCMA267DRE0 J 6-pin connector CN-E 1 AC

3- 1E QCNCMA237DRE0 J 3-pin connector CN-F 1 AD
3- 1F QCNCWA030DRE0 J 12-pin connector CN-G 1 AE
3- 1G RV-KXB003MRE0 M Fluorescent display tube 1 AV
3- 1H PTPEHB010MRE0 M Tape 2mm 1 AB
C1 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB
C2 VCEAB31VW108M J Capacitor 1000 uF 35V 1 AF

C3 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB
C4 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB
C5 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB
C6 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB
C7-8 VCKYD11CY103N J Capacitor 0.01 uF 16V 2 AH

C9-10 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 2 AB
C20 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB
C21 VCEAB31HW104M J Capacitor 0.1 uF 50V 1 AM
C30 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH
C50 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH

C60 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH
C70-74 VCKYD11HB331K J Capacitor 330 pF 50V 5 AA
C100 RC-QZB014MRE0 M Capacitor 7 uF 230V 1 AM

O

C 1AG

49

R-1855A

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

CF1 RCRS-A010DRE0 J Ceramic resonator (CST4.00MGW) 1 AD
D1-4 VHD11ES1///-1 J Diode (11ES1) 4 AB

D20-32 VHD1SS270A/-1 J Diode (1SS270A) 13 AA
D70-76 VHD1SS270A/-1 J Diode (1SS270A) 7 AA
IC1 RH-IZA719DRE0 J LSI 1 AW
IC2 RH-IZA495DRE0 J IC 1AL
Q1 VS2SB1238//-3 J Transistor (2SB1238) 1 AA

Q3 VSKRA101M//-3 J Transistor (KRA101M) 1 AB
Q4 VSDTA123ES/-3 J Transistor (DTA123ES) 1 AA
Q20-26 VSKRA101M//-3 J Transistor (KRA101M) 7 AB
Q27 VSKRC243M//-3 J Transistor (KRC243M) 1 AB
Q28-30 VSKRA101M//-3 J Transistor (KRA101M) 3 AB

Q40 VSKRA101M//-3 J Transistor (KRA101M) 1 AB
Q60 VSKRC101M//-3 J Transistor (KRC101M) 1 AB
Q90 VSKRA101M//-3 J Transistor (KRA101M) 1 AB
R1 VRD-B12HF432J J Resistor 4.3k ohm 1/2W 1 AH
R2 VRD-B12EF152J J Resistor 1.5k ohm 1/4W 1 AA

R3 VRS-B13AA681J J Resistor 680 ohm 1W 1 AA
R4 VRD-B12HF511J J Resistor 510 ohm 1/2W 1 AB
R7-8 VRD-B12EF472J J Resistor 4.7k ohm 1/4W 2 AA
R30 VRD-B12EF153J J Resistor 15k ohm 1/4W 1 AA
R31 VRD-B12EF472J J Resistor 4.7k ohm 1/4W 1 AA

R40 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 1 AA
R50 VRD-B12EF153J J Resistor 15k ohm 1/4W 1 AA
R51 VRD-B12EF472J J Resistor 4.7k ohm 1/4W 1 AA
R62 VRN-B12EK363F J Resistor 36k ohm 1/4W 1 AA
R63 VRN-B12EK221F J Resistor 220 ohm 1/4W 1 AB

R64 VRN-B12EK362F J Resistor 3.6k ohm 1/4W 1 AA
R70-74 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 5 AA
R75 VRD-B12EF104J J Resistor 100k ohm 1/4W 1 AA
R76-82 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 7 AA
R90-93 VRD-B12EF104J J Resistor 100k ohm 1/4W 4 AA

R100 VRS-B13AA331J J Resistor 330 ohm 1W 1 AA
RY1-3 RRLY-B002MRE0 M Relay (DU24D1-1P(M)) 3 AH
RY4-9 RRLY-A075DRE0 J Relay (OJE-SS-124LM) 6 AG
RY10 RRLY-B001MRE0 M Relay (VE-24HSF-K) 1 AM
SP40 RALM-A014DRE0 J Buzzer (PKM22EPT) 1 AG

T1 RTRNPB004MRE0 M Transformer 1 AN
VRS1 RH-VZA032DRE0 J Varistor (10G471K) 1 AE
ZD1 VHEHZ6A3///-1 J Zener diode (HZ6A-3) 1 AC
ZD2 VHEHZ161///-1 J Zener diode (HZ16-1) 1 AA
ZD3 VHEHZ5C2///-1 J Zener diode (HZ5C-2) 1 AA

ZD4 VHEHZ4A2///-1 J Zener diode (HZ4A-2) 1 AA
3- 2 FPNLCB153MRK0 M Control panel sub. assembly 1 BB
3- 2-1 FUNTKB108MRE0 M Key unit 1 AX
3- 2-2 GMADIB023MRF0 M Display window 1 AD
3- 2-3 MSPRTA050WRE0 M Open button spring 1 AA

3- 2-4 JBTN-B053MRF0 M Open button 1 AD
3- 2-5 JBTN-B055MRF0 M Select button 1 AC
3- 2-6 LANGQB036MRP0 M Key fixing 1 AL
3- 3 XEPSD30P10XS0 M Screw; 3mm x 10mm 5 AA

OVEN PARTS

4- 1 FFTA-B002MRK0 M Exhaust damper assembly 1 AM
4- 2 FROLPB020MRK0 M Turntable support assembly 1 AS
4- 3 NTNT-B006MRE0 M Turntable tray 1 AZ
4- 4 LANGKB010MRP0 M Capacitor holder 1 BB
4- 5 FCOVPB002MRY0 M Stirrer cover assembly 1 AM

4- 6 FFAN-B008MRK0 M Stirrer fan assembly 1 AK

∆

4- 7 ------------- M Oven cavity (Not a replaceble part) 1 -­4- 8 DHET-B001MRK0 M Convection heater unit 1 BL
4- 9 NCPL-B006MRF0 M Coupling 1 AE
4-10 NFANMB003MRP0 M Convection motor fan 1 AE

4-11 LANGQB031MRP0 M Convection motor angle 1 AF
4-12 PPACGB013MRE0 M Turntable motor packing 1 AC
4-13 LBNDK0054WRE0 M Heater mounting holder 2 AD
4-14 NFANMB004MRP0 M Convection fan 1 AE

∆

4-15 PHOK-B013MRF0 M Latch hook 1 AG
4-16 FANGTB003MRY0 M Unit mounting plate 1 AV

50

R-1855A

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

4-17 PFPF-B002MRE0 M Heat protect L 1 AK
4-18 PPIPFB002MRE0 M Coller 1 AD
4-19 PREFHB006MRP0 M Heater cover L 1 AM
4-20 PDUC-B083MRP0 M Hood intake duct L 1 AG

4-21 NFANPB005MRK0 M Fan blade 1 AC
4-22 GBDYRB002MRP0 M Back plate 1 AX
4-23 FDUC-B044MRK0 M Fan duct 1 AM
4-24 LBSHC0037WRE0 M Cord bushing 1 AB
4-25 FDUC-B022MRK0 M Exhaust duct 1 AK

4-26 MLEVPB016MRF0 M Open lever 1 AD
4-27 PCUSGB030MRP0 M Cushion 1 AC
4-28 MCAMPB001MRF0 M Damper cam 1 AC
4-29 PCUSGB032MRP0 M Damper cushion 1 AC
4-30 PFPF-B001MRE0 M Heat protect R 1 AD

4-31 PFTA-B003MRP0 M Damper plate 1 AD
4-32 PREFHB004MRP0 M Thermal cover R 1 AK
4-33 LANGQB033MRP0 M Hood lamp angle 1 AM
4-34 PREFHB005MRP0 M Thermal cover bottom 1 AK

4-35 LSTPPB024MRF0 M Door stopper 1 AD
4-36 PCOVPB047MRP0 M Oven lamp cover 1 AD
4-37 PCOVPB050MRP0 M Heat protect top sheet 1 AK
4-38 PCUSGB027MRP0 M Cushion 1 AA
4-39 PDUC-B056MRF0 M Hood exhaust duct 1 AY

4-40 PDUC-B057MRP0 M Top duct 1 AN
4-41 PDUC-B058MRF0 M Magnetron duct 1 AD
4-42 PDUC-B060MRP0 M Hood intake duct R 1 AH
4-43 PFILWA035WRE0 M Oven light screen 1 AF
4-44 PFPF-B003MRE0 M Heat protect top 1 AE

4-45 PCUSUB018MRP0 M Exhaust cushion A 1 AA
4-46 PCUSUB019MRP0 M Exhaust cushion B 1 AA
4-47 PCUSUB020MRP0 M Cushion 1 AA
4-48 PCUSUB024MRP0 M Cushion 1 AA
4-49 PCUSUB033MRP0 M Cushion 1 AD

4-50 PCUSGB035MRP0 M Cushion 1 AG
4-51 PCUSUB047MRP0 M Cushion 1 AD
4-52 PCUSUB046MRP0 M Cushion 1 AE
4-53 PFPF-B005MRE0 M Heat protect 1 AR
4-54 PFPF-B004MRE0 M Heat protect 1 AK
4-55 LANGQB025MRP0 M Noise filter angle 1 AE

DOOR PARTS

∆

5 CDORFB238MRK0 M Door assembly, complete 1 BL
5- 1 DDORFB074MRY0 M Door panel assembly 1 BN

∆

5- 2 GWAKPB058MRF0 M Door frame 1 AS

∆

5- 3 PGLSPB008MRR0 M Door glass front 1 AV
5- 4 GCOVHB031MRF0 M Choke cover 1 AM

∆

5- 5 LSTPPB025MRF0 M Latch head 1 AE
5- 6 LSTPPB028MRF0 M Glass stopper 1 AD
5- 7 MSPRTA046WRE0 M Latch spring 1 AB
5- 8 PCUSUB022MRP0 M Cushion 1 AC
5- 9 XCTSD40P08000 M Screw : 4mm x 8mm 6 AA

MISCELLANEOUS

6- 1 CFZK-B131MRK0 M Installation material assembly 1 AN
6-1-1 LBSHC0040MRE0 M Grommet 1 AC
6-1-2 LX-BZ0195WRE0 M Toggle screw 4 AC
6-1-3 LX-MZ0001WRE0 M Cord holder 1 AC
6-1-4 XBRSD50P60000 M Screw : 5mm x 60mm 2 AC

6-1-5 XOTSD40P12000 M Screw : 4mm x 12mm 1 AA
6-1-6 XTSSD50P35000 M Screw : 5mm x 35mm 6 AA
6-1-7 XWHSD50-16300 M Washer 2 AA
6- 2 TINSEB141MRR0 M Installation instruction 1 AD
6- 3 TINSEB209MRR0 M Operation manual 1 AF

6- 4 TINSKB018MRR0 M Top template 1 AD
6- 5 TINSKB019MRR0 M Wall template 1 AD
6- 6 QW-QZB011MRE0 M High voltage wire A 1 AD

*

6- 7 TCADCB012MRR0 M Cook book 1 AP
6- 8 FW-VZB171MRE0 M Main harness A 1 AY

51

R-1855A

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

6- 9 FAMI-B005MRM0 M High rack 1 AQ
6-10 FAMI-B006MRM0 M Low rack 1 AN
6-11 FW-VZB077MRE0 M Main harness C 1 AH
6-12 TCAUAA041WRR0 M Caution label 1 AA
6-13 TCAUAB005MRR0 M DHHS caution label 1 AB

6-13 TCAUAB034MRR0 M NHW caution label 1 AA
6-14 TCAUAB037MRR0 M Monitor caution label 1 AA
6-15 TCAUAB008MRR0 M User caution label (CANADIAN) 1 AA

SCREWS,NUTS AND WASHERS

7- 1 XCPSD40P08000 M Screw : 4mm x 8mm 2 AA
7- 2 XOTSF40P10000 M Screw : 4mm x 10mm 3 AB
7- 3 XCBSD30P08000 M Screw : 3mm x 8mm 2 AA
7- 4 XBTSD40P08RV0 M Screw : 3mm x 6mm 2 AA
7- 5 XCBSD30P08000 M Screw : 3mm x 8mm 2 AA

7- 6 XBTWW40P06000 M Screw : 4mm x 6mm 2 AA
7- 7 XOTSD40P12000 M Screw : 4mm x 12mm 24 AA
7- 8 XOTSF40P10000 M Screw : 4mm x 10mm 1 AA
7- 9 XBTSD40P08000 M Screw : 4mm x 8mm 2 AA
7-10 LX-BZB011MRE0 M Unit mounting screw 2 AH

7-11 LX-CZA038WRE0 M Special screw 4 AA
7-12 XCBWW30P06000 M Screw : 3mm x 6mm 5 AA
7-13 LX-CZ0052WRE0 M Special screw 2 AA
7-14 XCTWW40P08RV0 M Screw : 4mm x 8mm 2 AA
7-15 XRESD40-06000 M E-ring 1 AA

7-16 XOTSD40P12000 M Screw : 4mm x 12mm 2 AC
7-17 XCTWW40P08000 M Screw : 4mm x 8mm 1 AA
7-18 XNEUW40-32000 M Nut: 4mm x 3.2mm 1 AB
7-19 XWSUW40-10000 M Spring Washer 1 AA
7-20 LX-BZ0081YBE0 M Screw : 4mm x 8mm 9 AA

7-21 XWHSD50-20120 M Washer : 5mm x 2mm 1 AA
7-22 XWHUW40-08100 M Washer : 4mm x 0.8mm 2 AA
7-23 XWHUW50-08120 M Washer : 5mm x 0.8mm 1 AA
7-24 XOTSD40P08000 M Screw : 4mm x 8mm 9 AA
7-25 XOTWW40P10000 M Screw : 4mm x 10mm 10 AA

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 authrized SHARP parts Distributor for your area.
Defective parts required return should be returned as indicated in the Service Policy.

52

R-1855A

OVEN AND CABINET

1

PARTS

A

B

4-39

4-46

4-25

C

4-45

7-17

4-38

7-7

D

4-20

1-18

E

1-15

7-12

F

G

7-14

7-14

4-11

4-19

4-17

2-2

4-6

4-5

7-25

7-6

7-25

7-5

7-15

7-4

1-21

1-7

4-10

4-36

7-21

7-24

4-3

7-3

7-23

2

4-8

4-18

1-4

4-13

7-5

1-23

7-247-7

7-22

7-7

2-1

1-17

7-12

2-9

4-13

4-14

7-22

2-4

7-7

1-20

4-7

7-12

7-19

7-18

4-43

1-14

2-10

1-20

2-8

7-24

7-25

4-9

3

1-16

4-34

4-33

4-37

1-5

1-20

4-40

4-44

7-7

1-6

1-14

7-7

4-12

4-1

7-24

7-20

4-53

7-20

4-27

6-12

45

4-52

4-50

4-50

4-16

7-11

7-24

4-24

1-13

2-6

7-7

4-54

1-3

4-22

7-5

7-7

7-20

4-4

1-2

7-5

4-26

1-8

4-15

7-16

7-13

1-11

7-1

1-11

1-1

1-10

1-12

1-19

1-9

4-23

4-41

4-48

1-7

2-3

7-7

4-30

4-32

6-14

7-20

1-11

1-22

7-7

4-52

7-11

2-5

7-11

4-21

4-50

4-29

7-1

6-13

7-9

4-31

4-47

4-28

6

A

4-51

B

C

D

E

7-16

1-24

4-55

F

4-49

G

2-7

7-10

4-2

H

1

7-10

2

2-7-2

7-8

3

2-7-1

7-2

45

4-42

2-1

7-7

H

6

53

R-1855A

1

CONTROL PANEL PARTS

A

B

6-15

7-7

6-15

C

3-2-4

3-2-3

3-2-2

2

3-2-1

3-2-6

3-2

3-2-5

3

45

3-1

3-3

DOOR PARTS

6

A

B

4-35

3-3

5-9

5-6

5-4

5-1

C

5-9

D

5-5

D

5

5-7

5-8

E

E

5-3

5-2

6-1

F

6-1-1

6-6

MISCELLANEOUS

6-8

F

6-1-4

6-1-5

6-1-2

G

6-1-3

6-1-6

6-1-7

G

6-9

6-10

6-11

H

1

2

3

45

6

H

54

PACKING AND ACCESSORIES

6-1

INSTALL MATERIAL ASSEMBLY

6-7

6-3

6-5

6-2

6-4

2-1

6-10

COOK BOOK

OPERATION MANUAL

WALL TEMPLATE

INSTALLATION INSTRUCTION

TOP TEMPLATE

GREASE FILTER (x 2)

LOW RACK

DOOR PROTECTOR

R-1855A

TOP PAD

WRAP COVER

TRAY HOLDER

6-9

4-3

DAMPER HOLDER

HIGH RACK

MILLER MAT

TURNTABLE TRAY

4-2

TURNTABLE
SUPPORT
ASSEMBLY

TAPE

DAMPER ASSEMBLY

4-1

BOTTOM PAD

PACKING CASE

Non-replaceable items

55

R-1855A

NOTES:

56

NOTES:

R-1855A

57

R-1855A

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58

'99 SHARP CORP. (9M3.20E) Printed in U.S.A