Electrolux FMV156DSE Service manual

ELECTROLUX
SERVICE MANUAL
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
S95M241FM156E
OVER THE RANGE
MICROWAVE OVEN
MODELS
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
FMV56DCF
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should
be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY..................... INSIDE FRONT COVER
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE..................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
GENERAL INFORMATION.................................................................................................................................... 6
OPERATION........................................................................................................................................................... 9
TROUBLESHOOTING GUIDE ............................................................................................................................. 3
TEST PROCEDURE ............................................................................................................................................ 5
TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................. 25
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE................................................................. 29
PICTORIAL DIAGRAM ......................................................................................................................................... 37
POWER UNIT CIRCUIT ....................................................................................................................................... 38
LSI UNIT CIRCUIT ............................................................................................................................................... 39
PRINTED WIRING BOARD.................................................................................................................................. 40
PARTS LIST ........................................................................................................................................................ 4
PACKING AND ACCESSORIES .......................................................................................................................... 45
This document has been published to be used for after sales service only. The contents are subject to
change without notice.
ElEctrolux HoME ProDuctS, INc.
P. O. Box 212378, Augusta, GA, 30917
800•944•9044
Publication # 5995505459
P/N 316439263
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this
manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact Electrolux HOME
PRODUCTS, INC. immediately.
If the unit operates with the door open, service person should 1) tell the user not to operate the
oven and 2) contact Electrolux HOME PRODUCTS, INC. and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform Electrolux HOME PRODUCTS, INC. 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)
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with
following parts may result in a severe, possibly
fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power
Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
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.
Before Servicing
1. Disconnect the power supply cord remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
, and then
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.
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.
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.
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 re-examine
the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and microwave leakage test should be carried out.
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave
oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to
acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more
from the external surface of the oven.
2) Safety interlock switches: Primary interlock switch shall prevent microwave radiation emission in excess of the requirement
as above mentioned, secondary interlock relay and door sensing switch shall prevent microwave radiation emission in
excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5½C (68½F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the
oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the
metal has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the
closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the primary interlock switch does turn the oven OFF before any door movement.
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
SERVICE MANUAL
ELECTROLUX
PRODUCT DESCRIPTION
OVER THE RANGE
MICROWAVE OVEN
GENERAL INFORMATION
FMV156DBE / FMV156DSE
FMV156DQE / FMV156DCF
FOREWORD
OPERATION
This Manual has been prepared to provide Electrolux Home Products
Service Personnel with Operation and Service Information for the
ELECTROLUX OVER THE RANGE MICROWAVE OVENS, FMV156DBE, FMV156DSE, FMV156DQE, FMV156DCF.
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.
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service
personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “ * ” on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “ ∆ ” on parts list may cause undue microwave exposure, by themselves, or when they are damaged,
Electrolux HOME PRODUCTS, INC.
WIRING DIAGRAM
PARTS LIST
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
PRODUCT SPECIFICATION
ITEM
DESCRIPTION
Power Requirements 120 Volts / 14.1 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output 950 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions Width 29-15/16"
Height15- 9/16"
Depth16-1/4"
Cooking Cavity Dimensions Width17-11/16"
Height14-15/16"
1.5 Cubic Feet
Depth 9-7/8"
Hood lamp
2 bulbs, 20W x 2, Incandescent light bulbs
Hood fan
Approx. 300 C.F.M. (High mode)
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 Power
P-0...................................................... No power throughout the cooking time
Popcorn pad, Reheat pad, Cook pad,
Defrost pad, Number selection pads
Power Level pad, Timer / Clock pad
Light button, Fan button,
Clear/Off button, START/ Plus 1 Min button,
Oven Cavity Light
Safety Standard
Weight
20W x 1 Incandescent light bulb
UL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Approx. 55 lbs.
GENERAL INFORMATION
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.
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
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 dedicated line,
using a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood
system mounting location.
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
OVEN DIAGRAM
9
9
1
8
3
5
7
14
6
2
4
12
13
1.
2.
3.
4.
5.
6.
7.
8.
9.
10
Oven door with see-through window.
Door hinges.
Waveguide cover.
Turntable motor shaft.
Oven lamp.
It will light when oven is operating or door is
open.
Door latches.
The oven will not operate unless the door is
securely closed.
Auto Touch control panel
Time display: Digital display, 99 minutes 99
seconds.
Ventilation openings.
11
10.Light Cover.
11.Grease filters.
12.Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
Only remove for cleaning.
13.Removable turntable support.
14. Power supply cord
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
CONTROL PANEL
NOTE: Some one-touch cooking features such as "Plus 1 Min" are disabled after three minutes when the oven is not used.
These features are automatically enabled when the door is opened and closed or Clear-Off button is pressed.
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
of the primary interlock 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
secondary interlock relay, door sensing switch, and
primary interlock 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 open first. Then the
contacts of the primary interlock switch and door
sensing switch close. And contacts of
the relay (RY1) open.
If the primary interlock switch and secondary interlock relay
(RY2) fail with the contacts closed when the door is opened,
the closing of the monitor switch contacts will form a short
circuit through the monitor fuse, primary interlock switch,
relay (RY1) and secondary interlock relay (RY2), causing
the monitor fuse to blow.
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 "WELCOME, PRESS CLEAR AND
PRESS CLOCK".
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:
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:
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 RY1 RY2 RY3 RY4 CONNECTED COMPONENTS
Oven lamp / Fan motor / Stirrer motor
Power transformer
Turntable motor
Hood fan motor
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)
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, primary interlock switch,
and secondary 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
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
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
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 sides of the oven
cavity, then discharged vertically at rear center top of
the oven, into the customer's vent system.
To Duct
To Duct
Hood Fan
Motor
Hood
Intake
Duct R
Grease
Filter
2. HORIZONTAL VENTING
The air handing is the 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.
Hood Fan
Motor
To Duct
Hood
Intake
Duct R
Grease
Filter
3. RE-CIRCULATION (INSIDE VENTING)
The air handing is the 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 RK-240 must be
provided to filter the air before it leaves the oven.
Hood Fan
Motor
Hood Exhaust
Louver
Charcoal
Filter
Hood
Intake
Duct R
10
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
RED
RED
RED
MAG. TEMP. FUSE
ORG
CAVITY
THERMAL
CUTOUT
CONTROL UNIT
WHT
C3
(RY1)
HOOD
CAPACITOR
E1
MAGNETRON
BLK
(RY2)
SECONDARY
INTERLOCK
RELAY
OVEN LAMP
RELAY
RY5
BLK
HUMIDITY
SENSOR
F3
F2
HIGH
VOLTAGE
CAPACITOR
xx uF
F1
BLU
WHT
COM.
HIGH
VOLTAGE
RECTIFIER
RED
FM FAN
MOTOR
WHT
WHT
GRY
GRY
WHT
MONITOR
SWITCH
N.C.
COM
WHT
WHT
WHT
WHT
WHT
GRY
GRY
HL
TURN
TTM TABLE
MOTOR
OL OVEN
LAMP
WHT
BRN
HOOD
LAMP
ORG
RED
BRN
BRN
RED
RED
BLU
YLW
BLU
N
N.O.
HL
YLW
LINE BYPASS CAPACITOR
0.0033 uF 250V
HOOD
MOTOR
GND
A9
WHT
A3
A1
WHT
WHT WHT
NOISE SUPRESSION COIL
DOOR
SENSING
SWITCH
RED
LINE BYPASS CAPACITOR
0.0033 uF 250V
LINE CROSS CAPACITOR 1.0 uF 275V
FUSE
20A
RESISTOR 470 kW 1/2W
E2
RY6
BLK
HOOD FAN
THERMAL
CUT OUT
H
COM.
POWER
TRANSFORMER
A7
L
N.O.
A5
RED
RED
PPL
PPL
RED
RED
RED
ORG
BRN
ORG
120VAC GND
60Hz
RED
ORG
RED
RED
GRN
WHT
WHT
COM.
N.O.
PRIMARY
INTERLOCK
SWITCH
NOISE FILTER
NOTES:
1.CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE.
2. TERMINAL WITH PROJECTION OR OPPOSITE BLUE MARK ON LAMP SOCKET
MUST BE CONNECTED TO NEUTRAL WIRE.
3. ONLY CERTAIN MODELS USE THE ABSOLUTE HUMIDITY SENSOR.
4. POWER TRANSFORMER LEFT (FINISH LEAD) TERMINAL MUST BE CONNECTED TO THE NEUTRAL (WHITE) WIRE.
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. VA R I A B L E C O O K I N G C O N T RO L
"HIGH".
RED
RED
MAG. TEMP. FUSE
ORG
RED
ORG
CONTROL UNIT
WHT
BLK
RY5
BLK
(RY2)
SECONDARY
INTERLOCK
RELAY
OVEN LAMP
RELAY
(RY1)
HOOD
CAPACITOR
E1
F3
HUMIDITY
SENSOR
F2
HIGH
VOLTAGE
CAPACITOR
xx uF
F1
WHT
GRY
RED
MONITOR
SWITCH
N.C.
WHT
WHT
NOTES:
1.CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE.
2. TERMINAL WITH PROJECTION OR OPPOSITE BLUE MARK ON LAMP SOCKET
MUST BE CONNECTED TO NEUTRAL WIRE.
3. ONLY CERTAIN MODELS USE THE ABSOLUTE HUMIDITY SENSOR.
4. POWER TRANSFORMER LEFT (FINISH LEAD) TERMINAL MUST BE CONNECTED TO THE NEUTRAL (WHITE) WIRE.
Figure O-2. Oven Schematic-Cooking Condition
WHT
WHT
COM
COM.
N.O.
PRIMARY
INTERLOCK
SWITCH
11
HIGH
VOLTAGE
RECTIFIER
FM FAN
MOTOR
WHT
WHT
BRN
ORG
TURN
TTM TABLE
MOTOR
WHT
OL OVEN
LAMP
WHT
GRY
GRY
HL
HOOD
LAMP
ORG
GRY
BRN
HL
COM.
RED
BRN
N.O.
WHT
WHT
BRN
A9
WHT
RED
RED
YLW
BLU
BLU
WHT
YLW
HOOD
MOTOR
GND
A3
WHT
WHT WHT
LINE BYPASS CAPACITOR
0.0033 uF 250V
DOOR
SENSING
SWITCH
RY6
BLK
BLU
NOISE FILTER
E2
MAGNETRON
RED
PPL
N
COM.
POWER
TRANSFORMER
A1
LINE BYPASS CAPACITOR
0.0033 uF 250V
NOISE SUPRESSION COIL
LINE CROSS CAPACITOR 1.0 uF 275V
H
HOOD FAN
THERMAL
CUT OUT
N.O.
A5
A7
FUSE
20A
RESISTOR 470 kW 1/2W
L
RED
ORG
C3
PPL
RED
RED
RED
120VAC GND
60Hz
CAVITY
THERMAL
CUTOUT
RED
RED
GRN
RED
RED
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
DESCRIPTION AND FUNCTION OF COMPONENTS
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
SECONDARY INTERLOCK RELAY (RY2), RELAY (RY1), PRIMARY INTERLOCK SWITCH
AND MONITOR SWITCH FOR PROPER
OPERATION. (REFER TO CHAPTER "TEST
PROCEDURE").
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
DOOR OPEN MECHANISM
The door is opened by pulling the door handle, refer to the
Figure D-1.
Latch heads
Latch hook
Door sensing
switch
Door
THERMAL CUT-OUT (HOOD )
Monitor switch
This thermal cut-out located on the right base plate. 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 hood fan motor.
Primary interlock switch
Figure D-1. Door Open Mechanism
DOOR SENSING SWITCH, PRIMARY INTERLOCK
SWITCH
THERMAL CUT-OUT (CAVITY )
This thermal cut-out is located on the top of the oven cavity.
It is designed to prevent damage to the oven unit if the food
in the oven catches fire due to overheating produced by
improper setting of cooking time or failure of control unit.
Under normal operation, the thermal cut-out remains closed.
However, the thermal cut-out will open at 293OF (145OC)
causing the oven to shut down.
The primary interlock switch is mounted in the lower position
of the latch hook, the door sensing switch in the primary
interlock system is mounted in the upper position of the
latch hook is mounted on upper position of the latch hook.
They are activated by the latch heads on the door. When
the door is opened, the switches interrupt the circuit to all
components. A cook cycle cannot take place until the door
is firmly closed thereby activating both interlock switches.
The primary interlock system consists of the door sensing
switch and secondary interlock relay located on the control
circuit board.
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 relay (RY2) and primary interlock switch fail to
open when the door is opened.
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.
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 secondary interlock relay (RY2),
primary interlock switch are in the OFF condition (contacts
open) due to their being normally open contact switches.
And the contacts of relay (RY1) are in the ON condition
(contacts close).
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing
switch and the primary interlock switch contacts close.
(On opening the door, each of these switches operate
inversely.)
3. If the door is opened, and the secondary interlock relay
(RY2) and primary interlock switch contacts fail to open,
the monitor fuse blows simultaneously with closing of the
HOOD FAN MOTOR
The hood fan motor is a one-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.
HOOD LAMP
The hood lamps are mounted at the hood lamp angle on
the base cover. The hood lamps can be turned off and on
12
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TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter
which will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)
secondary interlock relay (RY2), door sensing switch and primary interlock switch before replacing the monitor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/KIT
as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,
be necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
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.
13
POSSIBLE CASE AND
DEFECTIVE PARTS
14
Oven stops at 32 seconds after starting.
B
A
The oven stops and "ERROR" is displayed or does not end during
Sensor Cooking condition. (Oven does not shut off after a cup of water
is boiling by Sensor Cooking.)
F
E
D
C
SENSOR
COOKING
CONDITION
I
H
G
MICROWAVE
COOKING
CONDITION
J
IDLE
CONDITION
L
K
OFF
CONDITION
N
N
M
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
receptacle.
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 140ûF (60ûC) 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 when WORK LIGHT pad or NIGHT LIGHT pad
is pressed.
Hood fan motor does not rotate at all with touched FAN HI/LO pad.
Speed of the hood fan motor does not change when the FAN HI/LO pad 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.)
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 (PHI) mode.
Function of COMPU DEFROST does not operate properly.
Stirrer motor does not operate. (Other parts operate.)
Oven goes into COMPU DEFROST but food is not defrosted well.
N
N
N
PROBLEM
O
CONDITION
TEST PROCEDURE
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CK = Check / RE = Replace
CK LOW VOLTAGE
CK NO POWER AT OUTLET
RE SHORTED IN POWER CORD
CK OPENED OR SHORTED WIRING
CK HOOD MOTOR CAPACITOR
RE HOOD LAMP OR SOCKET
CK TURNTABLE OFF CONDITION
RE TURNTABLE MOTOR
RE FAN MOTOR
RE OVEN LAMP OR SOCKET
FOIL PATERN ON P.W.B.
RELAY (RY-5)
RELAY (RY-4)
RELAY (RY-3)
RELAY (RY-2)
RELAY (RY-1)
KEY UNIT
CONTROL UNIT
HOOD FAN MOTOR
HOOD HERMAL CUT-OUT
MONITOR FUSE
MONITOR SWITCH
SECONDARY INTERLOCK SYSTEM
PRIMARY INTERLOCK SWITCH
TEMPERATURE FUSE OR THERMAL CUT-OUT
HIGH VOLTAGE CAPACITOR
H.V. RECTIFIER
POWER TRANSFORMER
MAGNETRON
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TEST PROCEDURES
PROCEDURE
LETTER
A
MAGNETRON ASSEMBLY TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
COMPONENT TEST
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
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
29.2 to 54.2οF(16.2 to 30.1οC) 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.
B
POWER TRANSFORMER TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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 83 ohms; the resistance of the filament coil should be less than 1 ohm.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
15
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
C
HIGH VOLTAGE RECTIFIER TEST
D
HIGH VOLTAGE CAPACITOR TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
1.
2.
3.
4.
5.
6.
7.
8.
E
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
CAVITY THERMAL CUT-OUT TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 293OF(145OC).
An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and
check inside of oven cavity and for improper setting of cooking time or operation of control unit.
Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and
air guide.
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.
MAGNETRON TEMPERATURE FUSE TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the magnetron temperature fuse terminals should indicate a closed circuit
unless the temperature of the magnetron temperature fuse reaches approximately 302OF(150OC).
An open magnetron temperature fuse indicates overheating of the magnetron. Check for restricted
air flow to the magnetron, especially the cooling fan air guide.
16
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM
TEMPERATURE, REPLACE TEMPERATURE FUSE.
5.
6.
7.
8.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE TEMPERATURE FUSE.
F
PRIMARY INTERLOCK SWITCH TEST
1.
2.
3.
4.
5.
6.
7.
8.
5.
6.
7.
8.
G
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
Reconnect all leads removed from
components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after
the outer case is installed.
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 motor, stirrer motor and oven light will be activated by RY1.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
SECONDARY 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.
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
(COM) terminal and check the continuity of the monitor circuit.
H
MONITOR SWITCH TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Before performing this test, make sure that the secondary interlock switch and the primary interlock
relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire
lead from the monitor switch (COM) 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 (COM)
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.
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 (COM)
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.
Red
White/ White
Screw Driver
Ohmmeter
Primary
Interlock Switch
Monitor Switch
18
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TEST PROCEDURES
PROCEDURE
LETTER
J
COMPONENT TEST
HOOD THERMAL CUT-OUT TEST
1.
2.
3.
4.
5.
6.
7.
8.
K
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate an open circuit unless the
temperature of the thermal cut-out reaches approximately 140½F(60½C) or more. At that temperature,
the contacts will close. The thermal cut-out opens automatically at approximately 113½F(45½C).
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
HOOD FAN MOTOR TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
If the motor does not turn, touch the FAN button once 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:
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
Resistance between;
BLU (1)
BLK (2)
BLU (1)
RED(5)
RED(5)
YLW(4)
AND
AND
AND
AND
AND
AND
YLW (4) = 0Ω (Shorted)
YLW (4) = 60Ω
BLK (2) = 60Ω
BLU (1) =162Ω
BLK (2) =102Ω
RED (5) =162Ω
YLW
6-PIN CONNECTOR
OF HOOD FAN MOTOR
4
5
YLW RED
BLU
4
1
HOOD FAN
CAPACITOR
MAIN
5
RED
120 v
60 Hz
60 Ω
SUB
2
BLK
102 Ω
19
BLU BLK
1
2
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TEST PROCEDURES
PROCEDURE
LETTER
L
COMPONENT TEST
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) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove two (2) screws holding the hood intake duct R to the ovencavity top plate and the base
plate R. And remove the hood intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
1. Key Unit.
NOTE ;
1) Check key unit ribbon connection before replacement.
2) Reconnect all leads removed from components during testing.
3) Re-install the hood intake duct R with two (2) screws.
4) Re-install the outer case (cabinet).
5) Reconnect the power supply cord after the outer case is installed.
6) 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) To discharge high voltage capacitor, wait for 60 seconds.
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.
2. Control Unit.
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure M) 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.
20
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
When testing is completed,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Reconnect all leads removed from components during testing.
5) Re-install the hood intake duct R.
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.
KEY UNIT TEST
G5
G6
G7
G8
G9
G11
G12
Reheat
2
Popcorn
3
Light
Cook
4
5
6
Fan
Defrost
7
8
9
Clear
Off
1
Power
Level
0
TIMER
CLOCK
START
Plus 1 Min
G1
G10
G4
6.
7.
8.
9.
Disconnect the power supply cord.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
Remove the control panel assembly.
If the display fails to clear when the CLEAR-OFF pad is depressed, first verify the flat ribbon cable is
making good contact, verify that the door sensing switch (stop switch) operates properly; that is the
contacts are closed when the door is closed and open when the door is open. If the door sensing
switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control
unit and make sure the door sensing switch is closed (either close the door or short the door sensing
switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a
jumper wire between the pins that correspond to the CLEAR-OFF 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.
Reconnect all leads removed from components during testing.
Re-install the control panel assembly.
Reconnect the power supply cord.
Run the oven and check all functions.
G3
1.
2.
3.
4.
5.
G2
M
G1
KEY UNIT
N
RELAY TEST
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. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood intake duct R.
5. Disconnect the leads to the primary of the power transformer.
6. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
21
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
7. After that procedure, re-connect the power supply cord.
8. Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the
relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1, RY2, RY4, and RY5 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated
Defective relay.
DC. voltage not indicated
Check diode which is connected to the relay coil. If diode
is good, control unit is defective.
RELAY SYMBOL
RY1
RY2(COOK)
RY4
RY5
OPERATIONAL VOLTAGE
Approx. 26.6V D.C.
Approx. 26.0V D.C.
Approx. 26.6V D.C.
Approx. 26.6V D.C.
CONNECTED COMPONENTS
Oven lamp / Fan motor / Turntable motor
Power transformer
Hood motor
Hood lamp
9. Disconnect the power supply cord.
10. Open the door and block it open.
11. To discharge high voltage capacitor, wait for 60 seconds.
12. Reconnect all leads removed from components during testing.
13. Re-install the hood intake duct R.
14. Re-install the outer case (cabinet).
15. Reconnect the power supply cord after the outer case is installed.
16. Run the oven and check all functions.
O
DEFROST CENTER TEST
(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity.
(3) Close the door.
(4) Touch the " DEFROST" pad once.
(5) Touch the number pad "2".
(6) Touch the number pad "5".
(7) Touch the " START " button.
(8) The oven is in Defrost center cooking condition.
(9) The oven will operate as follows.
Menu1ST STAGE
2ND STAGE
TIME LEVEL TIME
0.5lbs
60%
57sec.
40%17sec.
Steaks/Chops LEVEL
(8) If improper operation is indicated, the control unit is probably defective and should be checked.
P
FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse.
1. Foil pattern check and repairs.
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove the control unit, referring to the procedure of " CONTROL PANEL ASSEMBLY, CONTROL
UNIT AND KEY UNIT REMOVAL ".
5) Follow the troubleshooting guide given below for repair.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
2
RY3
c
(J1)
7
b
a d
P
6) Make a visual inspection of the varistor.
Check for burned damage and examine
the transformer with a tester for the
presence of layer short-circuit (check
the primary coil resistance which is
approximately 215 Ω ± 10%). If any
abnormal condition is detected, replace
the defective parts.
T1
VRS1
CN - A
7) Reconnect all leads removed from components during testing.
8) Re-install the control unit to the control panel and re-install the control panel to the oven.
9) Reconnect the power supply cord.
10) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " REMOVAL OF OVEN FROM WALL " and " OUTER CASE
REMOVAL ".
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove the hood intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
7) After that procedure, re-connect the power supply cord.
8) Follow the troubleshooting guide given below for repair.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between the normal open terminal of the relay RY2 and
the normal open terminal of the relay RY1.
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
9) Disconnect the power supply cord.
10) Open the door and block it open.
11) To discharge high voltage capacitor, wait for 60 seconds.
12) Reconnect all leads removed from components during testing.
13) Re-install the hood intake duct R.
14) Re-install the outer case (cabinet).
15) Reconnect the power supply cord after the outer case is installed.
16) Run the oven and check all functions.
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TEST PROCEDURES
PROCEDURE
LETTER
Q
COMPONENT TEST
NOISE FILTER TEST
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the leads to the primary of the power transformer.
Using an ohm-meter, check between the terminals as described in the following table:
N
NOISE FILTER UNIT
H
MONITOR
FUSE
RESISTOR
LINE CROSS CAPACITOR
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
LINE BYPASS CAPACITOR
0.0033uF/ 250v
0.0033uF/ 250v
LOAD
MEASURING POINT
Between N and H
LOAD
INDICATION OF OHM-METER
Open Circuit
Between terminal N and LOAD
Short Circuit
Between terminal H and LOAD
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.
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TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit (The Control unit consists of LSI Unit and
Power U nit)
Symbol
VC
Voltage
-5.3V
Application
LSI(IC1)
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.
The principal functions of these units and the signals communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated
in the LSI are sent to the key unit through P20, P21, P22,
P25, and P26.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P43, P44,
P45 and P46 to perform the function that was requested.
4) Reset Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
audible sounds (key touch sound and completion
sound).
Control Unit
Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, relay circuit
indicator circuit and back light circuit.
6) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor, hood
motor, and light the oven lamp and hood lamp.
1) LSI
This LSI controls the key strobe signal, relay driving signal
for oven function and indicator signal.
8) Indicator Circuit
This circuit consists of 22 segments and 3 common
electrodes using a Light Crystal Display.
2) Power Source Circuit
This circuit generates voltages necessary for the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
9) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1-LD4).
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
I/O
1-2
VL2-VL1
IN
3-6
AN7-AN4
IN
Description
Power source voltage input terminal.
Standard voltage for LCD.
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
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Pin No.
Signal
I/O
Description
7
AN3
OUT
Back light circuit (Light emitting diodes) driving signal.
To input signal which communicates the door open/close information to LSI.
8
AN2 IN
Door close "H" level signal (0V). Door open "L" level signal (-5V).
9-10
AN1-AN0 OUT
Terminal not used.
11-13
P57-P55
OUT
Terminal not used.
0.1 sec.
Signal to sound buzzer (2.0 kHz).
14
CNTR0
OUT
H : GND
A
A: key touch sound.
L : -5V
2.0 sec.
B: Completion sound.
H : GND
B
L : -5V
15
P53
OUT
16
P52
OUT
Terminal not used.
Oven lamp, fan motor and turntable motor driving signal
16.7 msec.
To turn on and off shut off relay (RY1).The square
waveform voltage is delivered to the RY1 driving
circuit and RY2 control circuit.
H : GND
During cooking
L : -5V
17-18
P51-P50
OUT
19
P47
OUT
Terminal not used.
OFF
Magnetron high-voltage circuit driving signal.
H : GND
Maximum
To turn on and off the cook relay (RY2). The
output
ON
signals holds "L" level during microwave cooking
L : -5V
OFF
OFF
and "H" level while not cooking. In other cooking
H : GND
70% of
24 sec.
modes (variable cooking) the signal turns to "H"
maximum
8 sec.
level and "L" level in repetition according to the
ON
output
L : -5V
power level.
(ON and OFF times for other power level.)
Signal coming from touch key.
20
P46
IN
When either G12 line on key matrix is touched, a corresponding signal out of P20, P21,
P22, P25 and P26 will be input into P46. When no key is touched, the signal is held at "H"
level.
Signal similar to P46.
21
P45
IN
When either G11 line on key matrix is touched, a corresponding signal will be input into
P45.
Signal similar to P46.
22
P44
IN
When either G10 line on key matrix is touched, a corresponding signal will be input into
P44.
Signal similar to P46.
23
P43
IN
When either G9 line on key matrix is touched, a corresponding signal will be input into
P43.
Signal synchronized with commercial power source frequency.
24
INT0
IN
H : GND
This is the basic timing for time processing of LSI.
L : -5V
16.7 msec.
25
P41
OUT
26
P40
IN
27
RESET
IN
28-29
P71-P70
OUT
30
XIN
IN
31
XOUT
OUT
32
VSS
IN
Terminal not used.
Connected to GND through the pull-down resistor R100.
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
Terminal not used.
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: -5.0V.
VC voltage of power source circuit input.
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Pin No.
Signal
I/O
34
P26
OUT
35
P25
OUT
36
P24
OUT
37
P23
OUT
38
P22
OUT
39
P21
OUT
40
P20
OUT
41
P17
OUT
42
P16
OUT
43
P15
OUT
44
P14
OUT
45-47
P13-P11
OUT
48-50 SEG24-SEG22 OUT
51-72 SEG21-SEG0 OUT
73/74 VCC/VREF
IN
75
AVSS
IN
76
COM3
OUT
77
COM2
OUT
78
COM1
OUT
79
COM0
OUT
80
VL3
IN
Description
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G7 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G6 line keys on key matrix is touched.
Terminal not used.
Terminal not used.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G3 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G2 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G1 line keys on key matrix is touched.
Terminal not used.
Hood lamp driving signal.
H : GND
To turn on and off relay(RY5). " L " level: During
OFF
Hood lamp ON. "H" level: During Hood lamp
L
ON
OFF.
Terminal not used.
Hood motor driving signal.
H : GND
To turn on and off relay(RY4). "L" level: During
OFF
Hood motor ON. "H" level: During Hood motor
L
ON
OFF.
Terminal not used.
Terminal not used.
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.) LSI signal (Pin No.)
LCD (Pin No.)
SEG 21 (51)--------------------- SEG21 ( 1)
SEG 10 (62)---------------------- SEG10 (12)
SEG 20 (52)--------------------- SEG20 ( 2)
SEG 9 (63)----------------------- SEG 9 (13)
SEG 19 (53)--------------------- SEG19 ( 3)
SEG 8 (64)----------------------- SEG 8 (14)
SEG 18 (54)--------------------- SEG18 ( 4)
SEG 7 (65)----------------------- SEG 7 (15)
SEG 17 (55)--------------------- SEG17 ( 5)
SEG 6 (66)----------------------- SEG 6 (16)
SEG 16 (56)--------------------- SEG16 ( 6)
SEG 5 (67)----------------------- SEG 5 (17)
SEG 15 (57)--------------------- SEG15 ( 7)
SEG 4 (68)----------------------- SEG 4 (18)
SEG 14 (58)--------------------- SEG14 ( 8)
SEG 3 (69)----------------------- SEG 3 (19)
SEG 13 (59)--------------------- SEG13 ( 9)
SEG 2 (70)----------------------- SEG 2 (20)
SEG 12 (60)---------------------SEG12 (10)
SEG 1 (71)----------------------- SEG 1 (21)
SEG 11 (61)---------------------SEG11 (11)
SEG 0 (72)----------------------- SEG 0 (22)
Connected to GND.
Connected to VC.
Terminal not used.
Common data signal: COM2.
Connected to LCD signal COM2.
Common data signal: COM1.
Connected to LCD signal COM1.
Common data signal: COM0.
Connected to LCD signal COM0.
Power source voltage input terminal.
Standard voltage for LCD.
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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.
transformer.
4) Re-install the outer case (cabinet).
5) Re-connect the power supply cord after the outer
case is installed.
6) Run the oven and check all functions.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that
the two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) of
the touch control panel while keeping it connected to
the oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, it is possible to check and repair the controls of
the touch control panel while keeping it apart from the
oven proper; in this case you must short both ends of
the door sensing switch (on PWB) of the touch control
panel with a jumper, which activates an operational state
that is equivalent to the oven door being closed. As for
the sensor-related controls of the touch control panel,
checking them is possible if dummy resistor(s) with
resistance equal to that of the controls are used.
(2)Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which
activates an operational state that is equivalent to the
oven door being closed. Connect an external power
source to the power input terminal of the touch control
panel, then it is possible to check and repair the controls
of the touch control panel it is also possible to check the
sensor-related controls of the touch control panel by
using the dummy resistor(s).
approx. 1M ohm
2. Shapes of Electronic Components
Transistor
KRC243M
E
CB
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform the
servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1)Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord, and then remove
outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
transformer.
5) Ensure that these leads remain isolated from other
components and oven chassis by using insulation
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control
panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
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: DC10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control
unit, remove the aluminium foil applied for preventing
static electricity.
2) Connect the connectors of the key unit to the control
unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that
abnormal voltage due to static electricity etc. is not
applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING AGAINST HIGH VOLTAGE:
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: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven.
1. Disconnect the power supply cord.
2. Make sure that a definite” click” can be heard when
the microwave oven door is unlatched. (Hold the door
in a closed position with one hand, then push the door
open button with the other, this causes the latch leads
to rise, it is then possible to hear a “click’ as the door
switches operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
1.
2.
3.
4.
5.
Door does not close firmly.
Door hinge, support or latch hook is damaged.
The door gasket or seal is damaged.
The door is bent or warped.
There are defective parts in the door interlock
system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
WARNING FOR WIRING
To prevent an electric shock, take the following precautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer and
Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Open lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
and make sure that the wire leads do not come off
even if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANAL 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, grease filter and charcoal filter.
2. Base cover and hood lamp glass assembly.
3. Turntable motor.
4. Hood exhaust louver.
5. Control panel assembly or components.
HOOD EXHAUST LOUVER REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate.
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5. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.
6. Now, the hood exhaust louver is free.
Push
Hood exhaust
louver
Tab (left )
Push
Tab (right)
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. To discharge the high voltage capacitor, wait for 60
6. While supporting the front of the oven, pull down the two
seconds.
(2) mounting levers and release the oven from the unit
3. Remove the turntable tray and support from the oven
mounting plate.
cavity.
7. Pull the power cord out of the wall cabinet and remove
4. If the exhaust damper assembly is installed, remove the
the oven.
one (1) screw holding the exhaust damper assembly to
8. The oven is now free and can be placed on the work
the rear stay, and remove the exhaust damper assembly
surface selected for servicing the oven.
by sliding it backward.
9. Installation is the reverse of this procedure.
5. Remove the two (2) screws holding the oven (outer case
cabinet) to the top cabinet.
OUTER CASE REMOVAL
power supply cord together with the outer case.
8. Nip the cord bushing with bushing pliers and release it
from the outer case cabinet.
9. Remove the cord bushing and the power supply cord
from the outer case cabinet.
10.Now, the power supply cord is free.
CAUTION:1. Disconnect oven from power
supply before removing outer
case.
2. Discharge the high voltage
capacitor before touching any
oven components or wiring.
Remove the oven from the wall, referring to "removal of
oven from wall" and proceed as follows;
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove four (4) screws holding the rear stay to the hood
fan motor or the oven, and remove it.
5. Remove the six (6) screws from the rear of the outer
case cabinet and one (1) screw at front.
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 TRANSFORMER REMOVAL
Re-install
1. Install by sliding the transformer on the base plate R with
its primary terminals toward the outer case.
2. Secure the transformer with two (2) screws to base plate
R.
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 to the oven cavity top
plate, the oven cavity front flange and the fan duct with
three (3) screws.
5. Re-install the outer case and check that oven is operating
properly.
CAUTION: Make sure the wire leads never
touch the fan blade.
1. Disconnect the power supply cord, remove the oven
from wall, and remove outer case. (Refer to procedure
of "Removal of Oven from Wall" and "Outer
Case Removal".) And proceed as follows.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove three (3) screws holding the hood intake duct R
to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect main wire harness from transformer.
6. Disconnect high voltage wire A from the transformer.
7. Disconnect filament leads of transformer from the
magnetron and capacitor.
8. Remove two (2) screws holding the transformer to base
plate R.
HOOD FAN 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")
seconds.
2. Open the door and block it open.
4. Disconnect the 6-pin connector of the hood fan motor
3. To discharge the high voltage capacitor, wait for 60
from the main wire harness located at the right edge of
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the oven cavity top plate and release the snap band from
the hood duct.
5. Remove the hood fan motor from the oven cavity top
plate by lifting it up.
6. Now, the hood fan motor is free.
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. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the high voltage wire lead of the high voltage
rectifier assembly from the magnetron.
6. Disconnect the filament lead of the transformer from the
magnetron.
7. Remove the one (1) screw holding the hood duct R to
the oven cavity top plate. And remove the hood duct R
from the oven cavity top plate R.
8. Remove the magnetron duct from the oven cavity, by
releasing the tab of the magnetron duct from the oven
cavity top plate.
9. Carefully remove four (4) mounting screws holding the
magnetron to waveguide. When removing the screws
hold the magnetron to prevent it from falling.
10.Remove the magnetron from the unit with care so the
magnetron tube should not be 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
8. Remove the fan duct assembly from the oven cavity,
referring to the procedure of "Cooling fan motor
removal"
9. Remove one (1) screw holding capacitor holder and
high voltage rectifier to the fan duct.
10.Disconnect the high voltage rectifier assembly from the
high voltage capacitor.
11.Now, the high voltage rectifier assembly is free.
12. Remove capacitor from the holder.
13.Now, the high voltage capacitor is free.
CAUTION: WHEN REPLACING THE HIGH VOLTAGE
RECTIFIER ASSEMBLY, THE GROUND SIDE
TERMINAL MUST BE SECURED FIRMLY WITH
A GROUNDING SCREW.
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. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the high voltage wire lead with high voltage
rectifier from the magnetron.
6. Disconnect filament lead of the transformer from high
voltage capacitor.
7. Disconnect high voltage wire A from capacitor.
HOOD FAN THERMAL CUT-OUT REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure
of "Removal of Oven from Wall" and "Outer case
Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the wire leads from the hood fan thermal
cut-out.
6. Remove one (1) screw holding the thermal cut-out to the
flange of base plate R (turntable motor side).
7. Remove the hood fan thermal cut-out from the base plate
R.
8. Now, the hood fan thermal cut-out is free.
THERMAL CUT-OUT (CAVITY) REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure
of "Removal of Oven from Wall" and "Outer case
Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Disconnect the wire leads from the thermal cut-out
(cavity).
5. Remove the thermal cut-out (cavity) from the holder at
the oven cavity bottom plate.
6. Now, the thermal cut-out (cavity) is free.
31
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
COOLING FAN MOTOR 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. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the one (1) screw holding the hood duct R to the
oven cavity top plate. And remove the hood duct R.
6. Disconnect the wire leads from the fan motor.
7. Disconnect the high voltage wire lead with the high
voltage rectifier from the magnetron.
8. Disconnect the filament lead of the transformer from the
high voltage capacitor.
9. Disconnect the high voltage wire A from the capacitor.
10.Release the wire leads from the hole of the fan duct.
11.Remove two (2) screws holding the fan duct to oven
cavity top plate and the base plate R.
12. Remove the fan duct assembly from the oven cavity.
13.Remove the fan blade from the fan motor shaft according
the following procedure.
14.Hold the edge of the rotor of the fan motor by using a
pair of groove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor
because the rotor is 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 damaged.
* Do not disfigure the bracket by touching with the
pliers.
15.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
16. 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.
17.Remove the two (2) screws holding the fan motor to the
fan duct.
18.Now, the fan motor is free.
INSTALLATION
1. Install the fan blade to the fan motor shaft according to
the following procedure.
2. Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
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.
4. Install the fan motor to the hood duct with the two (2)
screws.
CAUTION:
* Do not hit the fan blade with excesive force when
installing 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.
5. Install the fan duct to the oven cavity top plate and base
plate R with the two (2) screws.
6. Reconnect the wire leads to the fan motor, magnetron
and high voltage capacitor, referring to the pictorial
diagram.
7. Re-install the wire leads to the hole of the fan duct.
8. Re-install the hood intake duct R to the oven cavity top
plate, the oven cavity front flange and the fan duct with
the three (3) screws.
9. Refer to procedure of "Outer case Removal". And
reverse their procedure. And re-install the outer case.
Rear View
Coil
Shaft
Groove joint pliers
Shaft
Stator
Gap
Bracket
These are the areas
that should be held
with a pliers
Axis
Rotor
Stator
Rotor
Side View
32
Table
Center of
bracket
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
TURNTABLE MOTOR and Food Lamp Sockets REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the one (1) screw holding the base cover to the
oven cavity back plate.
5. Remove the three (3) screws holding the base cover to
the oven cavity front face plate.
6. Open the base cover.
7. Release the two hood lamp sockets from the base
cover.
8. Remove the base cover from the oven cavity by pulling
down and moving to the left slightly.
TURNTABLE MOTOR
9. Disconnect the wire leads from the turntable motor.
10. Remove one (1) screw holding turntable motor to
the oven cavity.
11. Now the turntable motor is free.
Hood Lamp Socket
9. Screw the hood lamp off from the lamp socket.
10.Disconnect the wire leads from the lamp socket by pushing
the terminal hole of the lamp socket with the small flat
type screw driver.
11. Now, the lamp socket is free.
OVEN LAMP and Lamp Socket REMOVAL
1. Disconnect the power supply cord, remove the oven from
the wall and remove the outer case. (Refer to procedure
of "Removal of Oven from Wall" and "Outer
Case removal".). And proceed as follows.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Turn the lamp socket and release it from the magnetron
duct.
6. Screw the oven lamp off from the lamp socket.
7. Now, the oven lamp is free.
8. 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.
9. Now, the oven lamp socket is free.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Terminal
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure
of "Removal of Oven from Wall" and "Outer case
Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
Positive lock¨
connector
1
Push
Lever
2
Pull down
CAUTION: When connecting the positive lock®
connectors to the terminals, install
the positive lock® so that the lever
faces you.
Positive lock® connector
CONTROL PANEL ASSEMBLY, CONTROL UNIT AND KEY UNIT REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove three (3) screws holding the hood exhaust louver
to oven cavity front face plate.
5. 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")
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
plate by lifting it up.
8. Disconnect the wire leads from the relays RY1 and
RY2.
9. Disconnect the connectors CN-A, CN-C and CN-E from
the control unit.
10. Remove the control panel assembly from the oven.
11.Now, the control panel assembly is free.
12.Disconnect the connector CN-G from the control unit.
13.Remove two (2) screws holding the power unit to the key
33
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
fixing plate.
14.Release the two (2) tabs holding the power unit to the
key fixing plate.
15.Release the three (3) tabs holding the LCD to the LCD
holder.
16.Release the two (2) tabs holding the LSI unit to the LCD
holder.
17.Remove the LCD holder and the LED sheet.
18.Now, the control unit is free.
19.Remove the one (1) screw holding the key fixing plate
to the control panel.
20.Release the six (6) tabs holding the key fixing plate to
the control panel.
21.Remove the key fixing plate from the control panel.
22.Remove the key unit from the key fixing plate.
23.Now, the key unit is free
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. See key unit location.
4. Stick the key unit firmly to the key fixing plate by rubbing
with soft cloth not to scratch.
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.
Key unit location
DOOR SENSING SWITCH, PRIMARY INTERLOCK 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. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the control panel assembly, referring to
the procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
6. Remove the two (2) screws holding the latch hook to the
oven cavity front flange.
7. Remove the latch hook from the oven cavity front
flange.
8. Disconnect the wire leads of each switch.
9. Remove each switch from the latch hook by pushing the
one (1) stopper tab holding each switch.
10.Now, each switch is free.
Re-install
1. Re-install each switch in its place. The primary interlock
switch is in the lower position, door sensing switch is in
the upper position and the monitor switch is in the middle
position.
2. Re-connect wire leads to each switch. Refer to pictorial
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, PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
cavity front flange.
7. 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 and primary interlock 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.
8. Secure the screws with washers firmly.
9. Check all of the switches operation. If any switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure
of "Removal of Oven from Wall" and "Outer case
Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the control panel assembly, referring to
the procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
If the door sensing switch, primary interlock switch and monitor switch do not operate properly due to a misadjustment,
the following adjustment should be made.
6. Loosen the two (2) screws holding latch hook to the oven
34
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
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 and primary interlock 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 heads
Latch hook
Door sensing
switch
Door
Monitor switch
Primary interlock switch
Figure C-1. Latch Switch Adjustments
DOOR REPLACEMENTDOOR ASSEMBLY REMOVAL
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.)
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate.
5. 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".)
6. Insert a 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.
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: The door on a microwave oven is designed to
act as an electronic seal preventing the leakage
of microwave energy from oven cavity during
cook cycle. This function does not require that
door be air-tight, moisture (condensation)-tight
or light-tight. Therefore, occasional appearance
of moisture, light or sensing of gentle warm air
movement around oven door is not abnormal
and do not of themselves indicate a leakage of
microwave energy from oven cavity.
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.
6. Re-install the door stopper to the door assembly.
7. Re-install the hood exhaust louver to the oven cavity
front face plate with the three (3) screws.
Note: After any service to the door;
(A) Make sure that door sensing switch and primary
interlock switch are operating properly. (Refer to
chapter "Test Procedures".)
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
Tab
Upper Door
Hige Pin
RE-INSTALL
Hood Exhaust Louver
Tab
Upper
Oven
Hige
Door assembly
Lower
Oven Hige
Latch
Heads
Lower Door
Hige Pin
Door Stopper
RE-INSTALL
Figure C-2. Door Replacement and adjustment
35
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
DOOR DISASSEMBLY
DOOR FRAME ASSEMBLY
11.Remove two (2) screws holding the door panel to the
door frame assembly.
12.Release the door panel from the door frame assembly.
NOTE: It is easier to release the engaging parts of the upper
or lower door hinge pin side at first.
13.Now, door frame assembly is free.
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate.
5. 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".)
6. Remove door assembly, referring to "Door
Replacement".
Replacement of door components are as follows:
7. Place door assembly on a soft cloth with latches facing
up.
Note: As the engaging part of choke cover and door frame
are provided at 15 places, do not force any particular
part.
LATCH SPRING, LATCH HEAD AND DOOR PANEL
14.Release the latch spring from the tab of the latch head
and tab of the door frame.
15.Release the latch head from the door frame.
16.Now, the latch spring and latch head are free.
A
Door Stopper
Choke Cover
CHOKE COVER
8. Insert a putty knife (thickness of about 0.5mm) into the
gap A between the choke cover and door stopper and
between the choke cover and the door frame as shown
Figure C-3 to free engaging parts.
9. Pry the choke cover by inserting a putty knife in order
shown in Figure C-3.
10.Now choke cover is free from door panel and door
frame.
NOTE:When carrying out any repair to the door, do
not bend or warp the slit choke (tabs on the
door panel assembly) to prevent microwave
leakage.
Putty Knife
Door Frame
Figure C-3. Door Disassembly
36
1
RED
NOISE FILTER
BOARD
2
COM.
N.O.
3
37
RY1
4
CN-B
CN-C
CN-A
T1
YLW
4
3
RED
RED
ORG
RED
GRY
GRY
WHT
WHT
1 RED
2
PPL
5
6
BLK
PINK or
ORG or
BRN
WHT
5
GRY
WHT
TURNTABLE
MOTOR
WHT
BRN
ORG
RED
WHT
BRN
WHT
FAN
MOTOR
MAGNETRON
Blue Marking
HOOD LAMPS
& SOCKETS
RED
WHT
WHT
BRN
RED
GRY
Power Supply
cord 120V 60Hz
PINK or
ORG or
BRN
BRN
WHT
WHT
POWER
TRANSFORMER
ORG
HOOD FAN
THERMAL
CUT-OUT
BLK
BLK
HIGH VOLTAGE
HIGH
VOLTAGE
CAPACITOR
HIGH VOLTAGE
WIRE A
H.V. RECTIFIER WIRE B
FILAMENT WIRE MUST BE
TWISTED WITH DIODE WIRE
(TWICE)
NOTE: WIRE DRESS
HIGH VOLTAGE COMPONENTS
OVEN LAMP & SOCKET
Blue
Marking
2 WHT
WHT
GRN/GRN 1 GRN
5
Figure S-1. Pictorial Diagram
N.O.
WHT
WHT
COM.
RED
CAVITY
THERMAL
CUT-OUT
RED
ORG
PRIMARY
INTERLOCK
SWITCH
COM.
MONITOR
SWITCH
N.C.
RED
RED
RED
MAGNETRON
TEMP
FUSE
RED
1 BLU
2 BLK
RED/ORG 3 BLK
4
to Right Base Plate
RY2
COM.
RY2
N.O.
RY1
COM.
RY1
N.O.
CN-A
7
8
9
BLU
BLK
HOOD FAN MOTOR
3
N.O.
COM.
RY2
(POWER UNIT)
1
GRN
RED
DOOR SENSING SWITCH
COM.
N.O.
YLW 4 YLW
3
RED 5 RED
6
B
CN-E
CN-C
4
3 RED
2
5
1 RED
GRN
E
WHT
BLU
CN-E
2 GRN
D
WHT
to Chassis Support
GRN
CONTROL UNIT
PPL
G
RED
F
2
2
1
1
C
N
H
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
6
A
A
B
GRN
C
H
6
D
E
F
G
H
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
1
2
4
3
5
6
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
Figure S-2. Power Unit Circuit
1
2
4
3
38
5
6
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
1
2
4
3
5
6
A
B
B
C
C
Figure S-3. LSI Unit Circuit
A
D
E
D
E
F
G
G
H
F
H
H
1
2
4
3
39
5
6
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
1
2
4
3
5
6
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
Figure S-4. Printed Wiring Board
1
2
4
3
40
5
6
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
PARTS LIST
Note:The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
REF. NO.
PART NO.
DESCRIPTION
Q'TY CODE
ELECTRIC PARTS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FC-QZB050MRK0A
Note 1
RMOTDA264WRZZ
RTHM-A135WRZZ
RTHM-A136WRZZ
RTRN-B096MRE0
RV-MZA293WRE0
QSW-MA085WRE0
FFS-BA016/KIT
FACCDB011MRE0
QSOCLB006MRE0
FMOTEA469WRKZ
RMOTEB031MRE0
RLMPTA086WRZZ
High voltage assembly High voltage capacitor
Turntable motor
Thermal cut-out 145ΟC (Cavity) Thermal cut-out N.O. 60ΟC (Hood Fan)
Power transformer
Magnetron
Primary interlock and door sensing switches Monitor switch (V-16G-2C25)/fuse assembly(20A 250V AC)
Power supply cord Oven lamp socket Hood fan motor
Fan motor
Oven lamp 15
16
16
16
17
18
18
18
18
19
19
19
20
21
22
22
22
LSTY-B026MRP0
PDIF-B048MRF0
C
PDIF-B049MRF0C
PDIF-B050MRF0A
GDAI-B094MRP0 HDECQB055MRF0
HDECQB053MRF0
B
HDECQB054MRF0
FDECQB006MRK0
GCABUB103MRP0
GCABUB105MRP0
GCABUB110MRP0
TMAPCB100MRR0
FANGKB009MRY0
PCOVPB096MRT0
PCOVPB097MRT0
PCOVPB102MRT0
Rear stay
Hood exhaust louver [FMV156DBD/FMV156DCE]
Hood exhaust louver [FMV156DSD]
Hood exhaust louver [FMV156DQD]
Base plate R Front panel L [FMV156DBD]
Front panel L [FMV156DSD]
Front panel L [FMV156DQD]
Front panel L [FMV156DCE]
Outer case cabinet [FMV156DBD/FMV156DCE]
Outer case cabinet [FMV156DSD]
Outer case cabinet [FMV156DQD]
Schematic diagram
Hood lamp glass assembly Base cover [FMV156DBD/FMV156DCE]
Base cover [FMV156DSD]
Base cover [FMV156DQD]
23
24
24
24
24
25
25
25
26
27
28
CPWBFB100MRU0
HPNLCB201MRR0
HPNLCB198MRR0
HPNLCB199MRR0
FPNLCB501MRK0
FUNTKB418/KIT
FUNTKB419/KIT
FUNTKB420/KIT
LANGQB061MRP0
XEPS730P10XS0
XEPS730P08XS0
Control unit Control panel sub. assembly [FMV156DBD]
Control panel sub. assembly [FMV156DSD]
Control panel sub. assembly [FMV156DQD]
Control panel sub. assembly [FMV156DCE]
Key unit [FMV156DBD/FMV156DCE] Key unit [FMV156DSD] Key unit [FMV156DQD] Key fixing plate Screw Screw
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
LSTPPB038MRF0
FROLPB025MRK0
NTNT-A108WREZ
LBNDKB009MRP0
PDUC-B111MRF0
A
FPWBFA380WRKZ
Note 1
PPACGB014MRF0
PHOK-B024MRF0
LANGTB210MRP0
NFANPB006MRE0
LBSHC0037WRE0
QFS-TA013WRE0
PDUC-B146MRP0
PCOVPB085MRP0
XCBS730P08000
LANGTB055MRP0
PDUC-B115MRF0
Door stopper
Turntable support assembly
Turntable tray
Capacitor holder
Magnetron duct Noise filter High voltage wire B
Turntable motor packing Latch hook
Unit mounting plate
Fan blade Cord bushing
Magnetron fuse Hood intake duct R Waveguide cover Screw Chassis support
Hood duct R
1
1
1
1
1
1
1
2
1
1
3
1
1
3
AH
AP
AL
AF
AH
AY
BK
AE
AF
AQ
AE
BA
AT
AE
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AE
AQ
AQ
AQ
AG
AL
AL
AL
AL
AZ
AZ
AZ
AB
AN
AV
1
1
1
1
1
1
1
1
1
1
4
BE
AX
AX
AX
AX
AQ
AQ
AQ
AQ
AB
AB
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
2
1
AB
AN
AM
AB
AF
AD
-AA
AF
AS
AC
AB
AC
AG
AH
AB
AD
AQ
CABINET PARTS
CONTROL PANEL PARTS
OVEN PARTS
41
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
REF. NO.
47
48
49
50
PART NO.
PDUC-B114MRF0
PDUC-B174MRP0
PDUC-B117MRF0
TINSEB386MRR1
DESCRIPTION
Hood duct L
Fan duct Orifice Installation instructions
Q'TY CODE
1
AQ
1
AH
1
AC
1
AC
51
51
51
51
52
52
52
53
53
53
54
55
56
57
58
58
58
59
60
CDORFB410MRK0
CDORFB413MRK0
CDORFB414MRK0
CDORFB411MRK0
FDORFB086MRT0
FDORFB089MRT0
FDORFB090MRT0
FCOV-B309MRK0
FCOV-B310MRK0
FCOV-B311MRK0
LSTPPB030MRF0
MSPRTA046WRE0
GCOVHB049MRF0
PSHEPB016MRE0
JHNDPB049MRF0
JHNDPB050MRF0
JHNDPB051MRF0
XCPS740P08000
XCPS740P10000
Door assembly [FMV156DBD]
Door assembly [FMV156DSD]
Door assembly [FMV156DQD]
Door assembly [FMV156DCE]
Door panel assembly [FMV156DBD/FMV156DCE]
Door panel assembly [FMV156DSD]
Door panel assembly [FMV156DQD]
Door frame assembly [FMV156DBD] (not supplied on S/S)
Door frame assembly [FMV156DSD]
Door frame assembly [FMV156DQD]
Latch head
Latch spring Choke cover
Sealer film Door handle [FMV156DBD/FMV156DCE]
Door handle [FMV156DSD]
Door handle [FMV156DQD]
Screw
Screw
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
CFZK-B816MRK0
LBSHC0037WRE0
LX-BZ0195WRE0
XBPS750P85000
XOTS740P12000
XTSS750P35000
XWHS750-16300
LANG-B002MRP0
TINSEB445MRR2
TINSKB108MRR0
QW-QZB025MRE0
FW-VZB287MRE0
TCAUAB055MRR0
TCAUAB050MRR0
TCAUAB048MRR0
PFIL-B016MRE0
PFIL-B002MRE0
FFTA-B005MRK0
Installation material assembly
Grommet
Toggle screw Screw : 5mm x 85mm Screw : 4mm x 12mm Screw : 5mm x 35mm Washer
Scale plate Operation manual
Top template
High voltage wire A Main harness
DHHS service caution label Monitor caution label Revised DHHS/GRD C/label Charcol filter
Grease filter
Exhaust damper assembly 79
79
79
80
81
82
83
84
LX-CZB004MRE0
LX-CZB006MRE0
LX-CZB008MRE0
XOTS740P12000
XOTS740P12000
XHTS740P08RV0
LX-CZ0052WRE0
LX-BZA041WRE0
Special
Special
Special
Screw :
Screw :
Screw :
Special
Special
DOOR PARTS
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
2
BB
BB
BB
BB
AW
AW
AW
AY
AY
AY
AC
AB
AG
AE
AH
AH
AH
AA
AA
1
1
4
2
3
6
2
2
1
1
1
1
2
1
1
1
2
1
AH
AC
AC
AA
AA
AA
AA
AD
AD
AB
AT
AT
AA
AA
AB
AT
AF
AH
3
3
3
29
1
4
2
4
AA
AA
AA
AA
AA
AA
AA
AA
MISCELLANEOUS
SCREWS,NUTS, WASHERS AND OTHER
screw
screw
screw
4mm x
4mm x
4mm x
screw
screw
(FMV156DBD/FMV156DCE)
(FMV156DSD)
(FMV156DQD)
12mm 12mm
8mm
Note 1: Supplied on higher level
42
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
2
1
4
3
6
5
OVEN AND CABINET PARTS
A
A
81
78
38
80
15
80
80
B
80
19
80
80
B
40
10
80
47
80
12
C
C
20
80
81
45
80
46
45
44
9
D
18
D
34
81
75
32
44
76
41
48
79
43
74
16
E
79
83
36
31
14
44
79
8
8
6
44
F
22
80
82
E
1
84
11
49
9
4
14
2
33
37
3
73
39
7
13
42
5
F
11
82
30
17
80
80
80
80
7-2
G
77
G
77
21
80
H
H
1
2
4
3
43
5
6
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
1
CONTROL PANEL PARTS
2
4
3
6
5
24
A
A
25
26
27
23
28
B
DOOR PARTS
28
B
29
57
C
C
59
52
51
56
59
D
D
60
53
E
E
54
55
58
71
F
F
35
72
61
62
64
G
G
65
MISCELLANEOUS
63
66
67
68
H
H
1
2
4
3
44
5
6
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
2
1
4
3
5
6
PACKING AND ACCESSORIES
A
A
31 TURNTABLE TRAY
B
50
B
INSTALLATION INSTRUCTIONS
TOP PAD
77
GREASE FILTER (x 2)
70 TOP/WALL TEMPLATE
DOOR PROTECTOR
C
69
WRAP COVER
OPERATION MANUAL
61
INSTALL MATERIAL ASSEMBLY
78
EXHAUST DAMPER
ASSEMBLY
C
ACCESSORY PACK
DOOR PAD
D
D
BOTTOM PAD
Non-replaceable items
PACKING CASE
E
E
F
F
G
G
H
H
1
2
4
3
45
5
6
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
NOTES
46
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
NOTES
47
FMV156DBE
FMV156DSE
FMV156DQE
FMV156DCF
COPYRIGHT © 2007 BY ELECTROLUX HOME PRODUCTS, INC.
ALL RIGHTS RESERVED.
No part of this publication may be reproduced,
stored in retrieval systems, or transmitted
in any form or by any means, electronic,
mechanical, photocopying, recording, or
otherwise, without prior written permission
of the publisher.
48