KitchenAid KOMS155MBL Bedienungsanleitung

TECHNICAL EDUCATION

KAC-36

JOB AID 4317340

OVER-THE-COUNTER

MICROWAVE OVEN

Model KOMS155MBL

- ii -

FORWARD

This KitchenAid Job Aid, “Over-The-Counter Microwave Oven,” (Part No. 3173 0), provides the

technician with information on the installation, operation, and service of the Over-The-Counter

Microwave Oven. It is to be used as a training Job Aid and Service Manual. For specific information

on the model being serviced, refer to the “Use and Care Guide,” or “Wiring Diagram” provided with

the microwave oven.

The Wiring Diagrams used in this Job Aid are typical and should be used for training purposes only.

Always use the Wiring Diagram supplied with the product when servicing the unit.

GOALS AND OBJECTIVES

The goal of this Job Aid is to provide detailed information that will enable the service technician to

properly diagnose malfunctions and repair the KitchenAid Over-The-Counter Microwave Oven.

The objectives of this Job Aid are to:

• Understand and follow proper safety precautions.

• Successfully troubleshoot and diagnose malfunctions.

• Successfully perform necessary repairs.

• Successfully return the microwave to its proper operational status.

WHIRLPOOL CORPORATION assumes no responsibility for any repairs made

on our products by anyone other than Authorized Service Technicians.

- iii -

TABLE OF CONTENTS

P ge

GENERAL............................................................................................................................... 1-1

Safety First......................................................................................................................... 1-1

Warning To Service Technicians ....................................................................................... 1-

Precautions To Be Observed Before And During Servicing

To Avoid Possible Exposure To Excessive Microwave Energy ...................................... 1-5

R.F. Leakage Test ............................................................................................................. 1-6

Precautions To Be Observed When Troubleshooting ....................................................... 1-7

KitchenAid Model & Serial Number Designations.............................................................. 1-8

Model & Serial Number Label And Wiring Diagram Locations .......................................... 1-9

Specifications................................................................................................................... 1-10

KitchenAid Microwave Oven Warranty ............................................................................ 1-12

INSTALLATION INFORMATION ........................................................................................... 2-1

Removing The Microwave Oven........................................................................................ 2-1

THEORY OF OPERATION ..................................................................................................... 3-1

Microwave Operating Sequence........................................................................................ 3-1

The Absolute Humidity (AH) Sensor Circuit....................................................................... 3-

COMPONENT ACCESS ......................................................................................................... -1

Component Locations ........................................................................................................ -1

Removing The Cabinet ...................................................................................................... -2

Removing The Control Board ............................................................................................ -3

Removing The Door Interlock Switch Assembly ................................................................ -

Removing The Line Fuse And Oven Lamp........................................................................ -6

Removing An Accent Or Task Lampholder And The Turntable Motor .............................. -7

Removing The Humidity Sensor & Cavity Temperature Fuse ........................................... -8

Removing The Magnetron Temperature Fuse And The Magnetron ................................ -10

Removing The High Voltage Capacitor & Diode, And The Cooling Fan Motor ............... -12

Removing The High Voltage Transformer ....................................................................... -15

Removing The Oven Door Assembly .............................................................................. -16

Removing The Oven Door & Control Panel And The Display Assembly ......................... -18

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COMPONENT TESTING ........................................................................................................ 5-1

Door Switches.................................................................................................................... 5-1

Turntable Motor ................................................................................................................. 5-2

HV Capacitor ..................................................................................................................... 5-2

Humidity Sensor ................................................................................................................ 5-3

Cavity & Magnetron Temperature Fuses ........................................................................... 5-3

Line Fuse ........................................................................................................................... 5-

Cooling Fan Motor ............................................................................................................. 5-

High Voltage Transformer.................................................................................................. 5-5

High Voltage Diode ............................................................................................................ 5-5

Magnetron.......................................................................................................................... 5-6

DIAGNOSIS & TROUBLESHOOTING ................................................................................... 6-1

Troubleshooting ................................................................................................................. 6-1

Touch Control Panel Assembly Test ................................................................................. 6-2

Key Unit Test ..................................................................................................................... 6-3

Relay Test.......................................................................................................................... 6-

Defrost Center Test ........................................................................................................... 6-5

Absolute Humidity (AH) Sensor ......................................................................................... 6-6

WIRING DIAGRAMS .............................................................................................................. 7-1

Schematic Diagram ........................................................................................................... 7-1

Wiring Diagram .................................................................................................................. 7-2

P ge

1-1

GENERAL

Electrical Shock Hazard

Plug into a grounded 3-prong outlet.

Do not re ove ground prong.

Do not use an adapter.

Do not use an extension cord.

Failure to follow these instructions can

result in death, fire, or electrical shock.

Electrical Shock Hazard

Disconnect power before servicing.

Replace all parts and panels before

operating.

Failure to do so can result in death or

electrical shock.

SAFETY FIRST

Your safety and the safety of others is very i portant.

We have provided many important safety messages in this Job Aid and on the appliance. Always

read and obey all safety messages.

This is the safety alert symbol.

This symbol alerts you to hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol and either the word

“DA GER” or “WAR I G.” These words mean:

All safety messages will tell you what the potential hazard is, tell you how to reduce the

chance of injury, and tell you what can happen if the instructions are not followed.

You can be killed or seriously injured if you don’t

i ediately follow instructions.

You can be killed or seriously injured if you don’t

follow instructions.

ELECTRICAL POWER SUPPLY &

GROUNDING REQUIREMENTS

1-2

Electrical Shock Hazard

Connect green ground wire to ground

screw.

Failure to do so can result in death or

electrical shock.

Electrical Shock Hazard

I proper use of the grounding plug can

result in a risk of electrical shock.

Before touching any oven component or wir-

ing, always unplug the oven from its power

source and discharge the high voltage capaci-

tor (see page 4-12).

Check that the unit is grounded before trouble-

shooting. Be careful of the high voltage circuits.

Discharge any static charge from your body by

touching ground before handling any part of

the circuitry on the control board. Electrostatic

discharge may damage the control circuit.

Do not touch oven components or wiring during

operation. Attach meter leads with alligator

clips when making operational tests.

For continued protection against radiation

emission, replace only with these types of

switches: Primary (Interlock) Switch: SZM-V16-

FA-63 or VP-533A-OF; Secondary (Interlock)

Switch: SZM-V01-FA-32; Interlock (Monitor)

Switch: SZM-VI6-FA-62 or VP-532A-OF; Oven

Lamp Switch: SZM-V6-FA-31 or VP-331 A-OD.

It is neither necessary nor advisable to attempt

measurement of high voltage.

Attaching the adaptor ground terminal to the

wall receptacle cover screw does not ground

the appliance unless the cover screw is metal

and not insulated and the wall receptacle is

grounded through the house wiring.

The microwave oven must be grounded. In the

event of an electrical short circuit, grounding

reduces the risk of electrical shock by providing

an escape wire for the electrical current. The

microwave oven is equipped with a cord having

a grounding wire with a grounding plug. The

plug must be plugged into an outlet that is

properly installed and grounded.

Consult a qualified electrician or serviceman if

the grounding instructions are not completely

understood, or if doubt exists as to whether the

microwave oven is properly grounded. Do not

use an extension cord. If the power supply cord

is too short, have a qualified electrician or

serviceman install an outlet near the micro-

wave oven.

1-3

ELECTROSTATIC DISCHARGE

(ESD) SENSITIVE ELECTRONICS

ESD problems are present everywhere. ESD

may damage or weaken the electronic control

assembly. The new control assembly may ap-

pear to work well after repair is finished, but

failure may occur at a later date due to ESD

stress.

• Use an antistatic wrist strap. Connect the

wrist strap to a green ground connection

point or unpainted metal in the appliance; or

touch your finger repeatedly to a green ground

connection point or unpainted metal in the

appliance.

• Before removing the part from its package,

touch the antistatic bag to a green ground

connection point or unpainted metal in the

appliance.

• Avoid touching electronic parts or terminal

contacts. Handle the electronic control as-

sembly by the edges only.

• When repackaging the failed electronic con-

trol assembly in an antistatic bag, observe

the above instructions.

1-4

To avoid possible exposure to microwave ra-

diation or energy, visually check the oven for

damage to the door and door seal before

operating any oven. Use a microwave survey

meter to check the amount of leakage before

servicing. In the event the R.F. Ieakage ex-

ceeds 4 mw/cm2 at 5 cm, appropriate repair

must be made before continuing to service the

unit. Check interlock function by operating the

door latch. The oven cook cycle should cut off

before the door can be opened.

The door and latching assembly contains the

radio frequency energy within the oven. The

door is protected by three safety interlock

switches. Do not attempt to defeat them.

Under no circu stances should you try to

operate the oven with the door open.

• Proper operation of microwave ovens re-

quires that the magnetron be properly

assembled to the waveguide and cavity.

ever operate the magnetron unless it is

properly installed.

• Be sure the “RF” seal is not damaged and

is assembled around the magnetron dome

properly when installing the magnetron.

• Routine service safety procedures should

be exercised at all times.

• Untrained personnel should not attempt

service without a thorough review of test

procedures and safety information con-

tained in this Job Aid.

WARNING TO SERVICE TECHNICIANS

KitchenAid microwave ovens have a monitor-

ing system designed to assure proper opera-

tion of the safety interlock systems.

The monitor switch will immediately cause the

oven fuse to blow if the door is opened and the

primary door interlock switch and/or the sec-

ondary interlock switch contacts fail in a closed

position.

CAUTION: Replace a blown fuse with a 20

a pere class H fuse only.

Test the upper and lower door interlock

switches, cook relay, and monitor switch (middle

switch) for proper operation as described in the

component test procedures, before replacing

the blown oven fuse.

Do not atte pt to repair sticking contacts

of any interlock switch, safety switch, or

Cook (Latch) relay. The co ponents ust

be replaced.

Any indication of sticking contacts during com-

ponent tests requires replacement of that com-

ponent to assure reliability of the safety inter-

lock system.

If the fuse is blown, the Monitor switch, and

the Pri ary, and Secondary interlock

switches ust be replaced. Be sure they

are properly connected.

1-5

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 the microwave power

for any service test or inspection within the

microwave generating components, check

the magnetron, wave guide or transmis-

sion 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, using procedures described in

this Job Aid, before the oven is released to

the owner.

E. A microwave leakage check to verify com-

pliance with the Federal Performance Stan-

dard should be performed on each oven

prior to release to the owner.

F. Do not attempt to operate the oven if the

door glass is broken.

1-6

R.F. LEAKAGE TEST

EQUIPMENT

• Electromagnetic energy leakage monitor

( ARDA 8100B, HOLADAY H 1501 ).

• 275 ±15 ML glass beaker.

TEST

On every service call, checks for microwave

energy emission must be made according to

the following manner.

1. Remove the cooking rack from the oven

cavity, if the microwave oven is so

equipped.

2. Place a 275 ±15 ML (9.3 oz.) glass of

water in the center of the oven bottom.

3. Select "HIGH" cook power, turn the micro-

wave oven on, and test for R.F. Ieakage at

the following locations:

a)Around the cabinet at the front.

b)Around the door.

c) Across the console panel.

d)Horizontally across the door.

e)Vertically across the door.

f) Diagonally across the door.

g)Across the air vents.

h)Across the rear air vent.

i) All lockseams.

j) Weld at bottom.

k) Bottom plate.

I) Oven feet.

4. The scan speed is one inch per second.

When checking for R.F. Ieakage, use an ap-

proved R.F. measuring device to assure less

than 4 mw/cm2 emission at 5 cm distance with

a maximum scan rate of 2.54 cm/second, in

compliance with U.S. Government Department

of Health, Education and Welfare 21CFR1030,

Performance Standard for Microwave Ovens.

A properly operating door and seal assembly

will normally register small emissions, but they

must be no greater than 4 mw/cm2 to allow for

measurement uncertainty.

OTE: Enter leakage readings in space BE-

FORE and AFTER on the service document.

All microwave ovens exceeding the emission

level of 4 mw/cm2 must be reported to Dept. of

Service for Microwave Ovens immediately and

the owner should be told not to use the micro-

wave oven until it has been repaired com-

pletely.

If a microwave oven is found to operate with the

door open, report to Dept. of Service, the

manufacturer and CDRH* immediately. Also

tell the owner not to use the oven.

The monitor switch acts as the final safety

switch protecting the customer from micro-

wave radiation. If the monitor switch operated

to blow the fuse when the interlocks failed, you

must replace all interlock switches with new

ones, because the contacts of those interlock

switches may be melted and welded together.

If safety interlock/monitor switch replacement,

or adjustment, is required, you must reconnect

the circuit, and perform a continuity check on

the monitor circuit.

All repairs must be performed in such a manner

that microwave energy emissions are minimal.

Address for CDRH is:

Office of Co pliance (HFZ-312) Center for

Devices and Radiological Health

1390 Piccard Drive

Rockville, MD 20850

* CDRH: Center for Devices and Radiological Health,

Food and Drug Administration.

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