Kenmore 721.60483000 Service Manual

DIVISION 20

BASIC FIELD MANUAL

FOR

MICROWAVE OVEN

MODEL 721.60483000

MODEL 721.60483000

October, 2000

CAUTION

WARNING TO SERVICE TECHNICIANS

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 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 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.

• Proper operation of the microwave ovens requires that the magnetron be assembled to the wave guide and
cavity. Never operate the magnetron unless it is properly installed.

• Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the
magnetron.

• Routine service safety procedures should be exercised at all times.

• Untrained personnel should not attempt service without a thorough review of the test procedures and safety
information contained in this manual.

MODEL 721.60483000

-1-

FOREWORD

Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to
the Microwave Energy normally contained within the oven cavity.

MODEL 721.60483000

MECHANICAL SERVICE INFORMATION

TABLE OF CONTENTS

1. Adjustment Procedures....................................................................................................................................... 3

2. Precautions on Installation .................................................................................................................................. 5

3. General Precautions in Use................................................................................................................................. 5

4. Trial Operation..................................................................................................................................................... 5

5. Specifications ...................................................................................................................................................... 6

6. Overall Circuit Diagram ....................................................................................................................................... 7-8

7. Operating Procedures ......................................................................................................................................... 9-11

8. Procedure for Measuring Microwave Energy Leakage........................................................................................ 12-13

9. Disassembly Instructions..................................................................................................................................... 14-18

10. Interlock Continuity Test.................................................................................................................................... 19

11. Test and Checkout Procedures, and Troubleshooting

A. Test Procedures............................................................................................................................................. 20-22

B. Checkout Procedures..................................................................................................................................... 23-25

C. Troubleshooting............................................................................................................................................. 26-30

MODEL 721.60483000

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-3-

MODEL 721.60483000

1. ADJUSTMENT PROCEDURES

To avoid possible exposure to microwave energy
leakage, adjust the door latches and interlock switches,
using the following procedure.

ONLY AUTHORIZED SERVICE PERSONNEL
SHOULD MAKE THIS ADJUSTMENT.

The Interlock Monitor and Primary Interlock Switch acts
as the final safety switch protecting the user from
microwave energy. The terminals between “COM” and
“NC” of the Interlock Monitor must close when the door
is opened. After adjusting the Interlock Monitor Switch,
make sure that it is correctly connected. See Figures 1-a
and 1-b throughout this procedure.

CHECK THE DOOR LATCH AND SWITCH
CLOSING.

NOTE: The outer cover of the microwave oven is

removed.

(1) Set the microwave oven on its side so that you can see

the latch board and the switches, as shown in
Figure 1-a.

(2) Close the door tightly and check gaps A and B to be

sure they are no more than 1/64” (0.5 mm). See Figure

1-b for close-up view of gaps A and B (door latches).
If all gaps are less than 1/64” (0.5 mm), adjustment of
the latch board may not be necessary. Go to Steps 5
and 6 to check the sequence of the switches.

NOTE: To correct sequence of the Primary Interlock

Switch, Secondary Interlock Switch and the
Interlock Monitor Switch is very important.

If any gap is larger than 1/64” (0.5 mm), you will need to
adjust the latch board-U, L. Go to step 3 and follow all
steps in order.

ADJUST THE LATCH AND SWITCH CLOSING

(3) Loosen the two screws holding the plastic latch board as

shown.

(4) With the oven door closed tightly, move the latch board

upward toward the top of the oven and/or away from the
door latch until the gaps are less than 1/64” (0.5 mm).

Hold the latch board tightly in this position until you
check the sequence of the switches in steps 5 and 6.

TEST THE LATCH AND SWITCH SEQUENCE

(5) Open the oven door slowly. Watch the door latch, the

Primary Switch. Release Rod and Lever on the switches
to make sure they are zero to the body of the switches
in the following sequence:

- Primary Interlock Switch

- Secondary Interlock Switch

- Interlock Monitor Switch

Adjust the latch board until the switches operate in this
sequence. See Steps 3 and 4.

(6) Close the oven door slowly and be sure it is tightly

closed. Watch the three switches to make sure they are
zero to the body of the switches in the following
sequence:

- Interlock Monitor Switch

- Primary Interlock Switch

- Secondary Interlock Switch

NOTE: The Interlock Monitor Switch is an added safety

check on the Primary and Secondary Interlock
Switches. If the Primary and Secondary Interlock
Switches allow the oven to operate with the door
open, the Monitor Switch will blow the fuse.

(7) When you achieve the proper sequence of switches in

Steps 5 and 6, tighten the latch board screws at that
point.

TEST THE MICROWAVE ENERGY LEAKAGE

(8) Using a survey meter, make sure the microwave energy

is below 5 mW/cm.sq.

LATCH BOARD

MODEL 721.60483000

DOOR LATCH

A

DOOR LATCH

SECONDARY
INTERLOCK
SWITCH

MONITOR
INTERLOCK
SWITCH

PRIMARY
INTERLOCK
SWITCH

0-1/64"

LATCH BOARD

Figure 1-a

LATCH

Figure 1-b

0-1/64"

-4-

2. PRECAUTIONS ON INSTALLATION

(Figure 2)

A. Plug the power supply cord into a 120 V AC, 60 Hz,

single-phase power source with a capacity of at least 20
amperes.

B. Since the unit weights about 38 lbs, be sure to place it

on a sturdy and flat surface.

C. Avoid placing the unit in a location where there is direct

heat or splashing water.

D. Place the unit as far away as possible from TV, radio,

etc. to prevent interference.

CAUTION

3. GENERAL PRECAUTIONS IN USE

A. Never operate the unit when it is empty. Operating the

oven with no load may shorten the life of the magnetron.
Whenever cooking dry foods (dried fish, bread, etc.) or a
small amount of food, be sure to put a glass of water
into the cooking compartment. The turntable tray may
become hot after operating, be careful when touching it.

B. Aluminum foil should be avoided because it will disrupt

cooking and may cause arcing. However, small pieces
may be used to cover some parts of food to slow the
cooking. Any aluminum foil used should never be closer
than 2.5 cm to any side wall of the oven.

4. TRIAL OPERATION

After installation, the following sequences and results
should be checked carefully.
A. Put a container filled with water (about 1 liter) into the

oven, and close the door tightly.
B. Touch the STOP/CLEAR and the COOK TIME keys.
C. Set cooking time for 10 minutes by touching “1”

and then “0” three times. “1000” appears in the

display window.
D. Touch the START key.

Make sure the cavity light comes on. The unit will begin

cooking and the display window will show the time

counting down by seconds.
E. After about 5 minutes, make sure the primary interlock

switch, the secondary interlock switch and the interlock

monitor and oven lamp switch operate properly by

opening and closing the door several times. Touch the

START key each time the door is closed.
F. Continue operating the unit. Four long beep sound

signal is heard when the time is up. The unit will shut off

automatically.
G. Confirm the water is hot.
H. Finally, measure the output power according to

“POWER OUTPUT MEASUREMENT” on page 13.

5. FEATURES AND SPECIFICATIONS

A. The safety systems incorporated in this model are:

(1) Primary interlock switch

(2) Secondary interlock switch

(3) Interlock monitor switch

(4) Choke system

(5) Magnetron thermostat

(6) Oven cavity thermostat

(Note: This thermostat located on the oven cavity will
open and stop the unit from operation only if a high
temperature is reached, such as, a fire created by
overcooking food.)

B. Any one of 10 power output levels ranging 100W to

1000W can be selected by the touch control and

electronic computer system.
C. Cooking time can be displayed on the digital readout.
D. Three different cooking stages can be set. The oven

remembers three cooking stages and changes from one

cooking stage to another. This is made possible with the

memory function of the microprocessor.

MODEL 721.60483000

-5-

This unit is equipped with a 3-prong plug for your safety.
If the wall outlet is a grounded 3-hole type, the unit will
be grounded automatically.

Three-Pronged(Grounding)
Plug

Figure 2

Properly Polarized and
Grounded
Outlet

SPECIFICATIONS

Rated Power Consumption..........................................1500W maximum

Output

..........................................................................1100W maximum (*IEC 705 Rating standard)

...................................................................Adjustable 100W through 1100W, 11 steps

Frequency....................................................................2,450 MHz ± 50 MHz

Power Supply...............................................................120V ±12V AC, 60Hz

Rated Current...............................................................13.0 Amp.

Magnetron Cooling.......................................................Forced Air Cooling

Microwave Stirring........................................................Turntable

Rectification..................................................................Rectification Voltage Doubler Half-Wave

Door Sealing ................................................................Choke System

Safety Devices.............................................................Thermostat:

Open at 90°C ± 5°C

Open at 75°C ± 5°C
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor

Magnetron....................................................................2M246

High Voltage Capacitor................................................Capacitor: 1.00µF, 2.1KV Ac

High Voltage Diode......................................................350mA, 9.0KV

Cavity Lamp.................................................................125V, 20W

Timer............................................................................Digital, up to 99 mm. 99 sec. (in each cooking stage)

Tray..............................................................................Tempered Safety Glass

Overall Dimensions......................................................23

7

/8”(W) x 139/16”(H) x 1913/16”(D)

Oven Cavity Size..........................................................17

17

/32”(W) x 107/8”(H) x 1821/32”(D)

Effective Capacity of Oven Cavity................................2.1 Cu.ft.

Accessories..................................................................Use and Care Manual ,Turntable,

Rotating Ring Assembly.

SWITCH CHART

NOTE: Use the above switch chart with circuit diagram on page 7.

MODEL 721.60483000

-6-

PRIMARY SECONDARY INTERLOCK
INTERLOCK INTERLOCK MONITOR
SWITCH SWITCH SWITCH

COM COM COM

NO NO NC

SWITCH MODE

CONDITIONS

DOOR OPEN

DOOR CLOSED

∞∞∞0

0

0

6. OVERALL CIRCUIT DIAGRAM
A. SCHEMATIC DIAGRAM

MODEL 721.60483000

-7-

IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES

IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND

HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER’S SPECIFIED PARTS

BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.

NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND

SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

NL

1
2
3
4

5
6
7
8

OL

FM

TTM

WH

SYMBOL

NOTE:

1. DOOR IS OPEN.

2.RS: SENSING
ELEMENT
RC: COMPENSATING
ELEMENT

3. WIRE COLOR.

COLOR
WHITE
BLACK

YELLOW
PINK

BLUE

GREEN
BROWN

BK

YL
PK

RED

RD

BL

GN
BN

H.V.DIODE

H.V. CAPACITOR

RDWH

BN(NC)(C)

YL

CN4

TURNTABLE

MOTOR

WH

GN

SECONDARY

INTERLOCK

SWITCH

WH

WH

WH

BK

BL

GN

PK

WH RD

RC RS

HUMIDITY

SENSOR

BK

RELAY 1

RELAY 2

L.V. TRANSFORMER

(CN1)

BK

RD

BK

FUSE

20A

PRIMARY
INTERLOCK
SWITCH
(NO)

BK

MONITOR SWITCH

H.V.TRANSFORMER

FAN

MOTOR

OVEN
LAMP

MGT/OVEN

THERMOSTAT

AC 120V/60Hz
SINGLE PHASE ONLY

MAGNETRON

321

B. MATRIX CIRCUIT FOR TOUCH KEY BOARD

MODEL 721.60483000

-8-

Figure 4

(Sensor)
Popcorn

(Sensor)

Cook

Express

Defrost

N.C

User

Choice

Timer

Time of

Day

Add

30 Sec

Quick

Defrost

(Sensor)

Reheat

Quick Touch

Cook

Quick

ON

MoreN.C Less

Power

Stop/
Clear

Time Start 8 9 0

1

N.C N.C N.C N.C N.C N.C

234567

7. OPERATING PROCEDURES

Starts the oven.

Start

Display Window- Shows:

* Time of day.
* Cooking time.
* Cooking power level.
It also function as a
countdown timer
when cooking.

NOTE: A "beep" sounds when you touch a "key" on the control panel,
to indicate that you have entered a setting.

Add 30 Sec

Used to set cooking time
quickly and directly

Sensor Popcorn
Sensor Reheat

User Choice

Used to change the oven’s
default settings

Time of Day

Used in setting time of day

Sensor Cook

Quick Touch Cook

Used to select

programming food items

Quick On

Used to cook at 100%

power for 1 to 9 minutes

Numbers-

Used to enter the:
* Time of day.
* Cooking time.
* Cooking power.
* Food weight for defrost.

Time

Express Defrost

More/Less

Quick Defrost

Used to quick defrosting

for 1.0 pound

Stop/Clear

Stops the oven and

clears all entries except

CLOCK.

Once cooking has

begun, however,

CLEAR will function

only after STOP

has been touched.

Timer

You can use your

microwave oven

as a timer.

Power

Used select
cooking power level.

A. OVEN CONTROL PANEL

MODEL 721.60483000

Figure 5

-9-

B. PANEL INSTRUCTIONS

The entire operation is done by simple touch control pads.

1. DISPLAY. The Display includes a clock and indicators that
tell you time of day, cooking time settings, and cooking
functions selected.

2. SENSOR COOK. This pad allows you to cook most of your
favorite foods without having to select cooking times and
power levels.

3. SENSOR REHEAT. This pad allows you to reheat
precooked room-temperature or refrigerated foods without
selecting cooking times and power levels.

4. QUICK TOUCH COOK. Touch this pad to select
programming food items.

5. QUICK ON. Touch this pad to cook at 100% cook power for
1 to 9 minutes.

6. TIMER. Touch this pad to use your microwave oven as a
kitchen timer.

7. USER CHOICE. Touch this pad to change the oven's default
settings for sound, clock, scroll speed, Lbs/Kg and demo
choice.

8. MORE/LESS. Touch this pad to adjust cook food for a
longer or shorter time.

9. QUICK DEFROST. This pad provides you with the quick
defrosting method for 1.0 pounds frozen foods.

10. EXPRESS DEFROST. This pad is an accurate defrosting
method for frozen meat, poultry and fish up to 6.0 lbs or 4.0
kgs.

11. TIME. Touch this pad to set a cooking time.

12. STOP/CLEAR. Touch this pad to stop the oven or clear

entries.

13. SENSOR POPCORN. This pad lets you pop commercially
packaged microwave popcorn.

14. ADD 30 SEC. Touch this pad to cook at 100% cook power
for 30 seconds to 99 minutes, 59seconds.

15. TIME OF DAY. Touch this pad to enter the time of day.

16. NUMBER PADS. Touch Number Pads to enter cooking

time, power level, quantities, or weights.

17. POWER. Touch this pad to set a cooking power.

18. START. Touch this pad to start all entries (except the

QUICK TOUCH and QUICK ON functions which start
automatically) and to turn Child Lock on or off.

MODEL 721.60483000

-10-

C. EASY USE CHART

(1) TIME OF DAY

1. Touch STOP/CLEAR.

2. Touch TIME OF DAY.

3. Touch numbers for correct time of day.

4. Touch START.

(2) TIMER

1. Touch STOP/CLEAR.

2. Touch TIMER.

3. Touch correct numbers for time.

4. Touch START.

(3) CHILD LOCK

To set:

1. Touch STOP/CLEAR.

2. Touch “START” more than 4 seconds.
To cancel:

1. Touch STOP/CLEAR.

2. Touch “START” more than 4 seconds.

(4) SENSOR COOK

1. Touch STOP/CLEAR.

2. Touch COOK.

3. Touch number for SENSOR COOK category.

(5) SENSOR REHEAT

1. Touch STOP/CLEAR.

2. Touch REHEAT.

3. Touch number from 1 to 3
(Touch 1: DINNER PLATE, Touch 2: SOUP/SAUCE,

Touch 3: CASSEROLE)

(6) SENSOR POPCORN

1. Touch STOP/CLEAR.

2. Touch POPCORN.

(7) QUICK TOUCH COOK

1. Touch QUICK TOUCH COOK.

2. Touch number for QUICK TOUCH COOK category.

3. Touch correct number for amount.

(8) ADD 30 SEC

1. Touch STOP/CLEAR.

2. Touch ADD 30 SEC.

(9) USER CHOICE

1. Touch STOP/CLEAR.

2. Touch USER CHOICE.

3. Touch number from 1 to 5
Touch 1: SOUND ON/OFF
Touch 2: CLOCK ON/OFF
Touch 3: SCROLL SPEED
Touch 4: LBS/KG
Touch 5: DEMO ON/OFF

4. Touch correct number for setting.

(10) QUICK DEFROST

1. Touch STOP/CLEAR.

2. Touch QUICK DEFROST.

3. Touch number from 1 to 3
(Touch 1: Ground Beef, Touch 2: Chicken Pieces,

Touch 3: Fish Fillets)

(11) EXPRESS DEFROST

1. Touch STOP/CLEAR.

2. Touch EXPRESS DEFROST.
Three different defrosting levels are provided.
(Ground Meat, Poultry, Steaks/Chops)

3. Enter the weight of your food in decimal
increments from 0.1 to 6.0 pounds.

4. Touch START

5. At beeping, turn food over by following the
instructions in the manual.

6. After turning food over, touch START to resume
defrosting.

(12) TIMED COOKING

1. Touch STOP/CLEAR.

2. Touch COOK TIME.

3. Touch numbers for cooking time.

4. Touch POWER.

5. Touch number for cooking power level.

6. Touch START.

(13) MULTI-STAGE COOKING

1. Touch STOP/CLEAR.

2. Touch COOK TIME.

3. Touch numbers for cooking time.

4. Touch POWER.

5. Touch number for cooking power level.

6. Repeat steps 2-5 to set 2nd cooking stage.

7. Touch START.

MODEL 721.60483000

-11-

8. PROCEDURE FOR MEASURING MICROWAVE
ENERGY LEAKAGE

A. CAUTIONS

(1) Be sure to check a microwave emission prior to servicing

the oven if the oven is operative prior to servicing.

(2) The service personnel should inform the manufacturer,

importer, or assembler of any certified oven unit found to
have a microwave emission level in excess of
5mW/cm.sq. and should repair any unit found to have
excessive emission levels at no cost to the owner and
should ascertain the cause of the excessive leakage.
The service personnel should instruct the owner not to
use the unit until the oven has been brought into
compliance.

(3) If the oven operates with the door open, the service

personnel should;

- Tell the user not to operate the oven

- Contact the manufacturer and CDRH (Center for
Devices and Radiological Health) immediately.
NOTE: Address on CDRH
Office of Compliance (HFZ-312)
Center for Devices and Radiological Health
1390 Piccard Drive
Rockville, Maryland 20850

(4) The service personnel should check all surface and vent

openings for microwave emission testing.

(5) Check for microwave energy leakage after every

servicing. The power density of the microwave radiation
leakage emitted by the microwave oven should not
exceed 1mW/cm.sq. And always start measuring of an
unknown field to assure safety for operating personnel
from radiation leakage.
NOTE: The standard is 5mW/cm.sq. while in the
customer’s home. 1mW/cm.sq. stated here is
manufacturer’s own voluntary standard for units in
customer’s home.

EQUIPMENT

• Electromagnetic energy leakage monitor (NARDA 8100B,
HOLADAY HI 1501)

• 600cc glass beaker

• Glass thermometer 100°C

B. MEASURING MICROWAVE ENERGY LEAKAGE

(1) Pour 275±15cc of 20±5°C water in a beaker which is

graduated to 600 cc, and place the beaker in the center
of the oven.

(2) Set the energy leakage monitor to 2,450 MHz and use it

following the manufacturer’s recommended test
procedure to assure correct result.

(3) When measuring the leakage, always use the 2 inch

(5cm) spacer supplied with the probe.
(4) Operate the oven at its maximum output.
(5) Measure the microwave radiation using and

electromagnetic radiation monitor by holding the probe

perpendicular to the surface being measured. (See

Figure 7)

C. MEASUREMENT WITH THE OUTER CASE REMOVED

(1) When you replace the magnetron, measure for

microwave energy leakage before the outer case is

installed and after all necessary components are

replaced or adjusted. Special care should be taken in

measuring the following parts.

- Around the magnetron

- The waveguide

WARNING: AVOID CONTACTING ANY HIGH VOLTAGE

PARTS.

MODEL 721.60483000

-12-

Move probe along shaded area.

Probe scanning speed
less than 2.5 cm/sec.

Figure 7

Figure 6

D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN

(1) After all components, including the outer panels, are

fully assembled, measure for microwave energy
leakage around the door viewing window, the exhaust
opening and air inlet openings.

(2) Microwave energy leakage must not exceed the values

prescribed below.

NOTES:

Leakage with the outer panels removed - less than
5mW/cm.sq. Leakage for a fully assembled oven
(Before the latch switch (primary) is interrupted) with the
door in a slightly opened position - less than
1 mW/cm .sq.

E. NOTE WHEN MEASURING

(1) Do not exceed meter full scale deflection.
(2) The test probe must be removed no faster than 1

inch/sec (2.5cm/sec) along the shaded area, otherwise
a false reading may result.

(3) The test probe must be held with the grip portion of the

handle. A false reading may result if the operator’s
hand is between the handle and the probe.

(4) When testing near a corner of the door, keep the probe

perpendicular to the surface making sure the probe
horizontally along the oven surface, this may possibly
cause probe damage.

F. RECORD KEEPING AND NOTIFICATION AFTER

MEASUREMENT

(1) After adjustment and repair of any microwave energy

interruption or microwave energy blocking device,
record the measured values for future reference. Also
enter the information on the service invoice.

(2) Should the microwave energy leakage not be more

than 1mW/cm.sq. after determining that all parts are in
good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.

(3) At least once a year, have the electromagnetic energy

leakage monitor checked for calibration by its
manufacturer.

G. POWER OUTPUT MEASUREMENT

(1) Fill the test beaker with 59 ˚F(15 ˚C) ~ 75 ˚F(24 ˚C) 1 liter tap

water.

(2) Stir the water in the beaker with thermometer ( ˚F or ˚C) and

measure temperature as T1.
(3) Place the beaker on the center of turntable.
(4) Set for one (1) minute and three (3) seconds and operate

the oven at high power.

NOTE: The additional three (3) seconds is to allow the

magnetron to begin generating power.

(5) When the heating is finished, stir the water again with

thermometer and measure the temperature of water as T2.
(6) Subtract T1 from T2, this will give you the temperature rise.
(7) The microwave power output is within specification, if the

temperature rise is as shown below:

Temperature Rise

Line Voltage Degrees ˚F Degrees ˚C

120 V 18.9 ~ 25.2 10.5 ~ 14
108 V Min. 17.5 Min 9.7

(8) Power output will be influenced by line voltage of power

supply. Consequently, correct power output must be

measured within 120V AC ± 1 Volt while unit is operating.

MODEL 721.60483000

-13-

SPECIAL TIP

• This oven used the button head screws.

• When you remove the screws, using the
tamper-resistant Torx driver have a
pin-in-head.

Button Head

(Torx style 2)

-14-

MODEL 721.60483000

9. DISASSEMBLY INSTRUCTIONS

IMPORTANT NOTES:

UNIT MUST BE DISCONNECTED FROM ELECTRICAL
OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS,
ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT
LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE
CAPACITOR IN THE HIGH VOLTAGE POWER
SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR
SHOULD BE DISCHARGED BY USING INSULATED
WIRE - I.E. TEST PROBE CONNECTED TO 10KOHM
RESISTOR IN SERIES TO GROUND. WHEN
RECONNECTING THE WIRE LEADS TO ANY PART,
MAKE SURE THE WIRING CONNECTIONS AND LEAD
COLORS ARE CORRECTLY MATCHED ACCORDING
TO THE OVERALL CIRCUIT DIAGRAM. (ESPECIALLY
SWITCHES AND HIGH VOLTAGE CIRCUIT.)

A. REMOVING OUT CASE (Figures 8)

(1) Remove three screws from the rear section.
(2) Remove one screw from the side section.
(3) Push the outer case back about 1 inch (3cm).
(4) Lift the case from the set.

B. REMOVING POWER AND CONTROL CIRCUIT

BOARD(Figure 9)

(1) Open the door.
(2) Remove two screws, securing the circuit board.
(3) Disconnect the lead wire from RELAY(RY2) on the

circuit board.

(4) Lift up and pull out control panel assembly carefully

from the cavity.

(5) Disconnect the lead wire from connector(CN1) on the

circuit board.

CAUTION: DISCHARGE THE HIGH VOLTAGE

CAPACITOR BEFORE SERVICING.

(6) Pull down and remove the circuit board from the control

panel.

(7) Remove the F.P.C connector from the terminal socket.

Lift up and pull out control panel

securing screw

ground screw

Remove screw

Figures 9

Figure 8

F.P.C.Connector

Control Panel

Circuit Board

C. DOOR GROSS ASSEMBLY REMOVAL

(1) Open the door.
(2) Remove the choke cover very carefully with a flat-blade

screwdriver.

CAUTION : Be careful not to damage door seal plate by

screwdriver.

(3) Lift up and push the door.

NOTE:

1. After replacing the door, be sure to check that the primary
switch, monitor switch, and secondary switch operate
normally.

2. After replacing the door, check for microwave energy leakage
with a survey meter. Microwave energy must be below the
limit of 5 mW/cm.sq. (with a 275 ml water load)

3. When mounting the door assembly to the oven assembly, be
sure to adjust the door assembly parallel to the chassis. Also
adjust so the door has no play between the inner door surface
and oven frame assembly. If the door assembly is not
mounted properly, microwaves may leak from the clearance
between the door and the oven.

MODEL 721.60483000

-15-

Remove choke cover

Remove Door

Figure 10

-16-

MODEL 721.60483000

D. MAGNETRON REMOVAL

(1) Disconnect the wire lead from the magnetron.
(2) Carefully remove the mounting screws holding the

magnetron and the waveguide.

(3) Remove the magnetron assembly until the tube is clear

from the waveguide.

NOTE:

1. When removing the magnetron, make sure its dome
does not hit any adjacent parts, or it may be damaged.

2. When replacing the magnetron, be sure to install the
magnetron gasket in the correct position and be sure
that the gasket is in good condition.

3. After replacing the magnetron, check for microwave
leakage with a survey meter around the magnetron.
Microwave energy must be below the limit of 5 mW/cm2.
(With a 275 ml. water load).

Make sure that gasket is rigidly attached to the

magnetron. To prevent microwave leakage, tighten the

mounting screws properly, making sure there is no gap
between the waveguide and the magnetron.

E. SUCTION GUIDE MAIN ASSEMBLY
NOTE: To repair any of them, the Suction Guide Main ASS’Y

should be removed first.
(1) Disconnect the wire lead from the capacitor and fan motor.
(2) Remove three screws holding the Suction Guide Main

ASS’Y to oven cavity.

(3) Pull out Suction Guide Main ASS’Y from the oven.

Figures 11

Pull out suction guide main ASS’Y

Screw

Remove screw

Figures 12

Waveguide
Dome

Waveguide
Bracket

Magnetron
Gasket
Magnetron

Air Duct

Magnetron

Pull out

-17-

MODEL 721.60483000

F. FAN MOTOR ASSEMBLY REMOVAL
NOTE: To repair any of them, the Suction Guide Main ASS’Y

should be removed first.
(1) Disconnect the wire lead from fan motor.
(2) Remove the fan.
(3) Remove the two screws holding the fan motor assembly to

the suction guide ass’y.

G. HIGH VOLTAGE TRANSFORMER REMOVAL

(1) Discharge the high voltage capacitor.
(2) Disconnect the wire lead from magnetron, high voltage

transformer, and capacitor.

(3) Remove the screw holding the high voltage transformer to

the base-plate.

H.V.
Transformer

Figures 14

Suction
Guide

H.V.

Diode

H.V.

Capacitor

Fan Motor
ASS'Y

Figures 13

H. REMOVING SENSOR

1) Disconnect the leadwire from PCB Assembly.

2) Remove a screw securing the sensor duct.

Figures 15

I. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL

(1) Discharge the high voltage capacitor.
(2) Disconnect the wire lead from the high voltage capacitor.
(3) Remove the screw holding the high voltage capacitor

bracket.

J. REMOVING THE TURNTABLE MOTOR

(1) Remove the glass turntable & the rotating ring ASS’Y by

hand.

(2) Remove the turntable motor cover.

The turntable base cover is easily removed by pinching

the six parts with wire cutting pliers.

(3) Disconnect the wire lead from the turntable motor

terminals.

(4) Remove the screw securing the turntable motor to the

oven cavity assembly.

(5) After repairing the motor, rotate the removed turntable

motor cover.

(6) Fit the turntable motor cover's projecting part to the base

plate slit.

NOTE:

1. Remove the wire lead from the turntable motor VERY
CAREFULLY.

2. Be sure to grasp the connector, not the wires, when
removing.

K. INTERLOCK SYSTEM

(1) INTERLOCK MECHANISM

The door lock mechanism is a device which has been
specially designed to eliminate completely microwave
activity when the door is opened during cooking and thus
to prevent the danger resulting from the microwave
leakage.

(2) MOUNTING OF THE PRIMARY/MONITOR/

SECONDARY SWITCHES TO THE LATCH BOARD

(3) INSTALLATION AND ADJUSTMENT OF THE LATCH

BOARD TO THE OVEN ASSEMBLY

• Mount the latch board to the oven assembly.

• Adjust the latch board in the arrow direction so that oven
door will not have any play in it when the door is closed.

• Tighten the mounting screw.

• Check for play in the door by pushing the door
release button. Door movement should be less than

0.5 mm. (1/64 inch)

Don't push the door release button while making this

adjustment. Make sure that the latch moves smoothly after
adjustment is completed and that the screws are tight.
Make sure the primary, monitor, and secondary switches
operate properly by following the continuity test
procedure.

MODEL 721.60483000

-18-

Wire Leads

Turntable Motor

Figures 16

Figures 17

(7) The taptite screw shall be used when a turntable

motor cover is secured with a screw.

ADJUSTMENT
DIRECTION

SECONDARY
SWITCH

MONITOR
SWITCH

PRIMARY
SWITCH

Taptite Screw

-19-

MODEL 721.60483000

A. PRIMARY INTERLOCK SWITCH TEST

When the door release button is depressed slowly with
the door closed, an audible click should be heard at
the same time or successively at intervals. When the
button is released slowly, the latches should activate
the switches with an audible click.
If the latches do not activate the switches when the
door is closed, the switches should be a adjusted in
accordance with the adjustment procedure. Disconnect
the wire lead from the primary switch. Connect the
ohmmeter leads to the common (COM) and normally
open (NO) terminal of the switch. The meter should
indicate an open circuit in the door open condition.
When the door is closed, the meter should indicate a
closed circuit.
When the primary switch operation is abnormal, make
the necessary adjustment or replace the switch only
with the same type of switch.

B. SECONDARY INTERLOCK SWITCH TEST

Disconnect the wire lead from the secondary switch.
Connect the ohmmeter leads to the common (COM)
and normally open (NO) terminals of the switch. The
meter should indicate a open circuit in the door open
condition. When the door is closed, meter should
indicate an closed circuit. When the secondary switch
operation is abnormal, make the necessary adjustment
or replace the switch only with the same type of switch.

C. MONITOR SWITCH TEST

Disconnect the wire lead from the monitor switch.
Connect the ohmmeter leads to the common (COM)
and normally closed (NC) terminals of the switch. The
meter should indicate closed circuit in the door open
condition. When the door is closed, meter should
indicate an open circuit. When the monitor switch
operation is abnormal, replace with the same type of
switch.
NOTE: After repairing the door or the interlock system,
it is necessary to do this continuity test before
operating the oven.

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION

EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.

TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH

COMPONENTS TEST PROCEDURE RESULTS

SWITCHES Check for continuity of the Door Door
(Wire leads removed) switch with an Ohm-meter open closed

Primary
Switch

Monitor
Switch

Secondary
Switch

NOTE : After checking for the continuity of switches, make sure that they are

connected correctly.

10. INTERLOCK CONTINUITY TEST

COM

NO

NC

COM

COM

NO

-20-

MODEL 721.60483000

CAUTIONS

1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE
FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR
AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE
TRANSFORMER.

2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF
WATER IN CONTAINER) IN THE OVEN.

COMPONENTS TEST PROCEDURE RESULTS

HIGH VOLTAGE
TRANSFORMER
(Wire leads removed)

MAGNETRON
(Wire leads removed)

1. Measure the resistance.
(Ohm-meter scale: Rx1 and Rx100)

• Primary winding

• Secondary winding

• Filament winding

2. Measure the resistance.
(Ohm-meter scale: Rx1000)

• Primary winding to ground

• Filament winding to ground

1. Measure the resistance.
(Ohm-meter scale: Rx1)

• Filament terminal

2. Measure the resistance.
(Ohm-meter scale: Rx1000)

• Filament to chassis

Approx.: 0.2 ~ 0.4 ohm
Approx.: 60 ~ 90 ohm
Less than: 1 ohm

Normal: Infinite
Normal: Infinite

Normal: Less than 1 ohm

Normal: Infinite

PRIMARY
TERMINAL

SECONDARY
TERMINAL

FILAMENT
WINDING
TERMINAL

11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING

A. TEST PROCEDURES

-21-

MODEL 721.60483000

COMPONENTS TEST PROCEDURE RESULTS

HIGH VOLTAGE
CAPACITOR

HIGH VOLTAGE
DIODE

NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.

Measure the resistance.
(Ohm-meter scale: Rx1000)

• Terminal to terminal.

Measure the resistance.
(Ohm-meter scale: Rx1000)

• Terminal to case.

Measure the continuity (Forward).
(Ohm-meter scale: Rx10000)

Measure the continuity (Reverse).
(Ohm-meter scale: Rx10000)

Normal: Momentarily indicates

several ohms, and
then gradually returns
to infinite.

Normal: Infinite.

Normal: Continuity.
Abnormal: Infinite.

Normal: Infinite.
Abnormal: Continuity.

NOTE: When testing the magnetron, be sure to install the magnetron gasket in the

correct position and be sure that the gasket is in good condition.

Antenna
Gasket

Chassis

Filament

-22-

MODEL 721.60483000

COMPONENTS TEST PROCEDURE RESULTS

RELAY 2

FAN MOTOR
(Wire leads removed)

TURNTABLE
MOTOR
(Wire leads removed)

SENSOR

Check for continuity of relay 2 with an ohm­meter.
(Remove wire leads from relay 2 and operate
the unit.)

Measure the resistance.
(Ohm-meter scale: R x 1)

Measure the resistance.
(Ohm-meter scale: R x 1)

1) Disconnect sensor connector from micom
computer board.

2) Measure resistance terminal to terminal
(ohm meter scale: R X 1000)

POWER
LEVEL

1 4 sec 18 sec
2 6 sec 16 sec
3 8 sec 14 sec
4 10 sec 12 sec
5 12 sec 10 sec
6 14 sec 8 sec
7 16 sec 6 sec
8 18 sec 4 sec
9 20 sec 2 sec

10 22 sec 0 sec

Normal:
A: Approx. 85 ~ 100 ohm.
B: Approx. 10 ~ 25 ohm.

Abnormal: Infinite or several

ohm.

Normal: Approx.100~150 ohm
Abnormal: Infinite or several

ohm.

Normal: Approximately

BK - RD: 5.1 Kohm
RD - WH: 2.1 Kohm

BK - WH: 2.1 Kohm
Abnormal: Infinite or several.
* Sensor cooking condition

1. Oven should be plugged in at least

5 minutes before sensor cooking.

2. Room temperature should not

exceed 95

°F .

3. Be sure the exterior of the cooking

container and the interior of the oven
are dry. Wipe each off with paper
towel.

4. The oven will not generate

microwave energy for the first 28
seconds of the sensor cooking cycle.

NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED

WHEN THE UNIT IS SERVICED FOR ANY REASON.

• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.

• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE

TO GRASP THE CONNECTOR, NOT THE WIRES.

Relay 2

A

B

RD

BK

WH

1

2

3

-23-

MODEL 721.60483000

B. CHECKOUT PROCEDURES

(1) CHECKOUT PROCEDURES FOR FUSE BLOWING

CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.

Fuse blows immediately after
the door is closed.

Fuse blows immediately after
the door is opened.

Fuse blows when the door is closed and START key
is touched.

Improper operation of the primary interlock,
secondary interlock switches and/or the interlock
monitor switch.

Malfunction of the high voltage transformer; the high
voltage capacitor including the diode, the magnetron,
the blower motor or the circuit board.

PROBLEMS CAUSES

NOTES:

- If the fuse is blown by an improper switch operation, replace the defective switches and the fuse at the same time.
After replacing the defective switches with new ones, make sure that they are correctly connected.

- Check for microwave energy leakage according to “1. ADJUSTMENT PROCEDURES” on page 3, when the
primary interlock, secondary interlock switches and/or the interlock monitor switches are adjusted or replaced.

-24-

MODEL 721.60483000

(2) CHECKOUT PROCEDURES FOR RELAY

- PROBLEM (A) ­FAN motor and oven lamp turn on without touching
START key when the door is closed.

Remove the mate connector of I/O
CON from the circuit board does
the unit still operate?

GOOD

GOOD

Replace the

circuit board

- PROBLEM (B) ­FAN motor and oven lamp turn on When the door is
closed and START key is touched.

Check the interlock switches

Replace the
micro switches.

Defective
RELAY or poor
connection of
relay

Replace
RELAY or correct
the connection.

NO

NO

YES

NO

NO

YES

YES

MODEL 721.60483000

-25-

NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS

SERVICED FOR ANY REASON.

(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD

The following symptoms indicate a defective circuit
board.
(1) The start function fails to operate but the high

voltage Systems, the interlock switches, the door

sensing and the relay check good.
(2) The unit with a normal relay continuously operates.
(3) The buzzer does not sound or continues to sound.

(4) Some segments of one or more digits do not light up, or

they continue to light up, or segments light when they

should not.
(6) Wrong figures appear.
(7) The figures of all digits flicker.
(8) Some of the indicators do no light up.
(9) The clock does not keep time properly.

-26-

MODEL 721.60483000

C. TROUBLE SHOOTING

WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE
FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE
OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.

CAUTIONS

1. Check grounding before checking for trouble.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor.

4. When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these
parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage
to your meter.

5. Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel.
Always touch yourself to ground while working on this panel to discharge any static charge built up in your body.
(Micom model only)

CONDITION

Microwave oven

does not work.

Inserting many plugs into one
outlet and using them at the
same time.
(blown fuse or breaker)

Microwave oven plug is not
inserted tightly.

Output power is too low. Low AC input voltage.

Food temperature is too low.

Using metallic ware and
allowing it to touch the oven
wall.

Sparks occur.

Inconsistent intensity of
microwave by their
characteristics.

1. Use plastic wrap or lid.

2. Stir once or twice while
cooking soup, cocoa or
milk, etc.

Uneven cooking.

Ceramic ware trimmed in
gold or silver powder is used.

Avoid using other electrical
appliances when you use the
microwave oven.

Insert microwave oven plug
securely.

Use the microwave oven at
adequate line voltage.

This may not be a defect.
It is possible that the food
should be cooked for a
longer time period.

Do not use metallic ware for
cooking except where noted
in the cooking guide.

Do not use any type of
cookware with metallic
trimming.

CAUSE REMEDY

-27-

MODEL 721.60483000

1. Incomplete segments.

• Segment missing.

• Partial segment missing.

• Digit flickering (NOTE: Slight flickering is normal.)

2. Colon does not turn on or blink.

3. A distinct change in the brightness of one or more numbers in display.

4. One or more digits in the display are not lighting.

5. Display indicates a number different from one touched, for example, key in 5 and 3 appears in the display.

6. Specific numbers (for example 7 or 9) will not display when key pad is touched.

7. Display does not count down with time blinking or up with clock operation.

8. Display obviously jumps in time while counting down.

9. Display counts down too fast while cooking.

10. Each indicator light does not turn on after setting cooking cycle.

11. Display time of day does not reappear when cooking is finished.

(TROUBLE 1)

The following visual conditions indicate a probable defective control circuit.

CONDITION CHECK RESULT CAUSE REMEDY

1. No input can be
programmed.

Continuity

No continuity

Defective PCB
assembly.

Loose
connection.

Replace PCB
assembly.

Connect them
tightly.

Check the conn­ection between
membrane key
assembly and
PCB assembly.

2. Some inputs
cannot be
programmed.

3. Display shows a
number or figure
different from one
touched.

4. Random
programming
when touching
other pads.

5. Display is fixed
at some figure
and can not
accept any
input.

Everything works
as specified.

Still have trouble.

Defective key
membrane
assembly.

Defective PCB
assembly.

Replace key
membrane
assembly.

Replace PCB
assembly.

Replace key
membrane
assembly and
check operation.

-28-

MODEL 721.60483000

CONDITION CHECK RESULT CAUSE REMEDY

1. Fuse blows. Continuity.

No continuity.

Continuity.

Shorted contact at
the primary switch.

Replace fuse,
primary, monitor
switches, and
RELAY(RY2) of
P.C.B Assembly.

No continuity.

Normal.

Defective high
voltage capacitor.

Replace high
voltage capacitor.

Fuse blows again

Defective high volt­age transformer.

Replace high volt­age transformer.

Malfunction of the
monitor switch.

Replace fuse,
primary, monitor
switches, and
RELAY(RY2) of
P.C.B Assembly.

Check continuity
of monitor
switch (with
door closed).

Check continuity
of primary
switch (with
door opened).

Disconnect one
side of the wire
lead connected
from transformer
to the high
voltage
capacitor and
operate the unit.

Replace fuse

2. Fuse does not
blow.

No continuity.

Continuity.

No continuity.

Defective power
supply cord.

Replace power
supply cord.

Defective
thermostat.

Replace
thermostat.

Check continuity
of thermostat.

Check continuity
of power supply
cord.

(TROUBLE 2)

Oven does not operate at all, Display window does not display any figures,
and no input is accepted.

-29-

MODEL 721.60483000

CONDITION CHECK RESULT CAUSE REMEDY

1. Setting time
does not count
down when
touching START
pad.

2. Fan motor or
oven lamp do
not turn on.

No continuity.

Continuity.

Continuity

Defective PCB
assembly.

Loose connection.

Replace PCB
assembly.

Connect them
tightly.

No continuity

Abnormal

Check fan motor.

Defective fan motor. Replace fan motor.

Abnormal

Normal

Check oven lamp.

Defective oven lamp. Replace oven lamp.

Defective
secondary switch.

Replace
secondary switch.

Check continuity
of secondary
switch (with
door closed).

Check the con­nection between
CN1 connector
and PCB
assembly.

(TROUBLE 3)

Display shows all figures set, but oven does not start cooking while desired

program times are set and START pad is touched.

(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.

NOTE :

Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.

CONDITION CHECK RESULT CAUSE REMEDY

Output is low

Lower than 90% of
rating voltage.

Normal

Abnormal

Defective PCB
assembly.

Replace PCB
assembly.

Normal

Abnormal

Measure the
output power.

Defective
magnetron.

Replace
magnetron.

Decrease in power
source voltage
with load.

Suggest customer
contact local
electric power
utility co. or
qualified
electrician.

Check the
power source
voltage.

Disconnect the
wire leads from
relay 2 and
check on and off
time with
multitester.

-30-

MODEL 721.60483000

CONDITION CHECK RESULT CAUSE REMEDY

No microwave
oscillation.

No continuity.

Continuity.

Abnormal

Defective high
voltage
transformer.

Replace high
voltage
transformer.

Normal

Defective PCB
assembly.

Replace PCB
assembly.

Disconnect the
wire leads from
relay 2 and
check continuity
of relay 2.
(Operate the unit)

Check high vol­tage transformer

Output is full power
when you set lower
power level.

Abnormal.

Defective PCB
assembly.

Replace PCB
assembly.

Disconnect the
wire leads from
relay 2 and check
continuity relay 2.
(Operate the unit)

Abnormal

Defective high
voltage capacitor.

Replace high
voltage capacitor.

Normal

Check high vol­tage capacitor.

Abnormal

Defective high
voltage diode.

Replace high
voltage diode.

Normal

Check high vol­tage diode.

Abnormal

Defective
magnetron.

Replace
magnetron.

Check
magnetron.

(TROUBLE 5)

No microwave oscillation even though oven lamp and fan motor run.
(Display operates properly)

NOTE : • Make sure the wire leads correct position.

• When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.

• When removing the magnetron, be sure to install the magnetron gasket in the correct position

and in good condition.

October, 2000

-1-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

INTRODUCTION

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

INTERIOR PARTS

OVEN CAVITY PARTS

DOOR PARTS

LATCH BOARD PARTS

CONTROL PANEL PARTS

BASE PLATE PARTS

SENSOR PARTS

#EV#

October, 2000

-2-

DRAWING NO: 1

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

DOOR PARTS

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

13352A

13213A

13552A

13536A

14026A

14970A

13581A

15006A

13551A

#EV#

October, 2000

-3-

DRAWING NO: 1

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

DOOR PARTS

(See Illustration “DOOR PARTS”)

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-4-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

CONTROLLER PARTS

DRAWING NO: 2

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

268711

24510L

23551B

24970A

WTP018

23550D

24781M

#EV#

23551A

October, 2000

-5-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

CONTROL PANEL PARTS

(See Illustration “CONTROLLER PARTS”)

DRAWING NO: 2

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-6-

DRAWING NO: 3

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED BY A
TRIPLE ASTERISK(***)

33390G

WTT

020

WSZ185

33112U

WTT020

33461Z

35889A

33052M

36549S

WTP

013

340511

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

OVEN CAVITY PARTS

#EV#

October, 2000

-7-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

OVEN CAVITY PARTS

(See Illustration “OVEN CAVITY PARTS”)

DRAWING NO: 3

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-8-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

LATCH BOARD PARTS

DRAWING NO: 4

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

55262A

WTT028

43500A

466003

466001

466001

43501A

WSZ

085

56912B

#EV#

October, 2000

-9-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

LATCH BOARD PARTS

(See Illustration “OVEN CAVITY PARTS”)

DRAWING NO: 4

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-10-

DRAWING NO: 5

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

568771

WSZ

002

WSZ

196

WSZ

002

WSZ

002

WSZ

002

WTT

028

56411A

56930V

56549F

54974S

WTT

037

55900A

54810C

WTT

028

50

CZZH

56851D

34930W

34810M

WSZ

002

948502

56324A

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

OVEN INTERIOR PARTS

#EV#

October, 2000

-11-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

OVEN INTERIOR PARTS

(See Illustration “LATCH BOARD”)

DRAWING NO: 5

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-12-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

BASE PLATE PARTS

DRAWING NO: 6

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

948501

63302R

56170D

WSZ002

WTT021

WTT021

63302L

65006B

65006B

63303L

63303R

#EV#

October, 2000

-13-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

BASE PLATE PARTS

(See Illustration “BASE PLATE PARTS ”)

DRAWING NO: 6

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-14-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

SENSOR PARTS

DRAWING NO: 7

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

56501A

WTP002

WTT021

54974T

#EV#

October, 2000

-15-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

SENSOR PARTS

(See Illustration “SENSOR PARTS ”)

DRAWING NO: 7

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

#EV#

October, 2000

-16-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

POWER AND CONTROL CIRCUIT BOARD

DRAWING NO: 11

COMPONENT SIDE SOLDER SIDE

October, 2000

-17-

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

POWER AND CONTROL CIRCUIT BOARD

(See Illustration “POWER AND CONTROL CIRCUIT BOARD”)

DRAWING NO: 11

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

-18-

October, 2000

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

SCHEMATIC DIAGRAM OF P.C.B

DRAWING NO: 11

-19-

October, 2000

KENMORE MICROWAVE OVEN

MODEL NO. 721.60483000

SCHEMATIC DIAGRAM OF P.C.B

(See Illustration “SCHEMATIC DIAGRAM OF P.C.B”)

DRAWING NO: 11

N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO
COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF
THE UNIT. * ITEMS NOT ILLUSTRATED.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED
BY A TRIPLE ASTERISK(***)

P/NO: 3828W5S1706