KitchenAid Architect Series KBMS1454R User manual

TECHNICAL EDUCATION
JOB AID 4317377
KAC-45
Built-In
Microwave
Oven
Model: KBMS1454R

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WHIRLPOOL CORPORATION assumes no responsibility for any repairs made
on our products by anyone other than Authorized ervice Technicians.
FORWARD
This KitchenAid Job Aid, “Built-In Microwave Oven,” (Part No. 4317377), provides the technician
with information on the installation, operation, and service of the Built-In Microwave Oven. For
specific information on the model being serviced, refer to the “Use and Care Guide,” or “Wiring
Diagram” provided with the Built-In Microwave Oven.
The Wiring Diagrams and trip Circuits 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 OBJECTI ES
The goal of this Job Aid is to provide information that will enable the service technician to properly
diagnose malfunctions and repair the Built-In Microwave Oven.
The objectives of this Job Aid are to:
• Understand and follow proper safety precautions.
• uccessfully troubleshoot and diagnose malfunctions.
• uccessfully perform necessary repairs.
• uccessfully return the Microwave Oven to its proper operational status.
Copyright © 2005, Whirlpool Corporation, Benton Harbor, MI 49022

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TABLE OF CONTENTS
GENERAL............................................................................................................................... 1-1
afety First......................................................................................................................... 1-1
Warning To ervice Technicians ....................................................................................... 1-2
Precautions To Be Observed Before And During ervicing
To Avoid Possible Exposure To Excessive Microwave Energy ..................................... 1-3
R.F. Leakage Test ............................................................................................................. 1-4
Precautions To Be Observed When Troubleshooting ....................................................... 1-5
Model & erial Number Designations ................................................................................ 1-6
Model & erial Number Label And Tech heet Locations................................................. 1-7
pecifications..................................................................................................................... 1-8
KitchenAid Microwave Oven Warranty ............................................................................ 1-10
INSTALLATION INFORMATION ........................................................................................... 2-1
Installation Requirements .................................................................................................. 2-1
Installation Instructions ...................................................................................................... 2-5
PRODUCT OPERATION ........................................................................................................ 3-1
Theory Of Operation .......................................................................................................... 3-1
Microwave Oven Control ................................................................................................... 3-2
Parts And Features ............................................................................................................ 3-2
Troubleshooting ................................................................................................................. 3-3
COMPONENT ACCESS ......................................................................................................... 4-1
Component Locations ........................................................................................................ 4-1
Removing The User Interface Board ................................................................................. 4-2
Removing The Display, Touch Panel Board, & elector Board......................................... 4-3
Removing The Humidity ensor & The Cavity Thermostat ............................................... 4-5
Removing The Interlock witches ..................................................................................... 4-6
Removing The Halogen Lamp & The Lamp Transformer .................................................. 4-8
Removing The 20A Line Fuseholder, Power upply Cord,
And Line Filter Capacitor ............................................................................................. 4-10
Removing The Cooling Fan Motor ................................................................................... 4-12
Removing The Electronic Control Board ......................................................................... 4-14
Removing The Magnetron Thermostat & The Magnetron ............................................... 4-15
Removing The High Voltage Transformer, Diode, And Capacitor ................................... 4-17
Removing The Turntable Motor ....................................................................................... 4-19
Removing The Oven Door ............................................................................................... 4-20
Page

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COMPONENT TESTING ........................................................................................................ 5-1
Humidity ensor ................................................................................................................ 5-1
Cavity Thermostat.............................................................................................................. 5-2
No Load Cavity Thermostat ............................................................................................... 5-2
Door Interlock witches ..................................................................................................... 5-3
Lamp Transformer ............................................................................................................. 5-3
20A Line Fuse.................................................................................................................... 5-4
Line Filter Capacitor........................................................................................................... 5-4
Cooling Fan Motor ............................................................................................................. 5-5
Magnetron Thermostat ...................................................................................................... 5-5
Magnetron.......................................................................................................................... 5-6
High Voltage Transformer.................................................................................................. 5-6
High Voltage Capacitor & Diode ........................................................................................ 5-7
Turntable Motor ................................................................................................................. 5-8
DIAGNOSTICS & TROUBLESHOOTING .............................................................................. 6-1
Failure Code Indications .................................................................................................... 6-1
Microwave Oven Power Output Test ................................................................................. 6-2
Primary, econdary, & Monitor Interlock witch Checkout Procedure .............................. 6-3
Touch Panel....................................................................................................................... 6-4
Board Interconnection Diagram ......................................................................................... 6-6
Microwave Oven Wiring ..................................................................................................... 6-7
WIRING DIAGRAMS & STRIP CIRCUITS ............................................................................. 7-1
chematic Diagram ........................................................................................................... 7-1
Wiring Diagram .................................................................................................................. 7-2
trip Circuits ...................................................................................................................... 7-3

1-1
GENERAL
SAFETY FIRST
Your safety and the safety of others is very important.
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:
DANGER
WARNING
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 an be killed or seriously injured if you don’t
immediately follow instru tions.
You an be killed or seriously injured if you don’t
follow instru tions.

1-2
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 ir umstan es 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: Repla e a blown fuse with a 20
ampere lass 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 attempt to repair sti king onta ts
of any interlo k swit h, safety swit h, or
Cook (Lat h) relay. The omponents must
be repla ed.
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 swit h, and
the Primary, and Se ondary interlo k
swit hes must be repla ed. Be sure they
are properly onne ted.

1-3
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.

1-4
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.
NOTE: 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:
Offi e of Complian e (HFZ-312) Center for
Devi es and Radiologi al Health
1390 Pi ard Drive
Ro kville, MD 20850
* CDRH: Center for Devices and Radiological Health,
Food and Drug Administration.

1-5
PRECAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
WARNING
DISCHARGING HIGH
VOLTAGE CAPACITORS
For about 30 seconds after the oven is
turned off, an electric charge remains in the
high voltage capacitors in the inverter power
supply circuit board.
When replacing or checking parts, remove
the power plug from the outlet. Use a screw-
driver with an insulated handle, and short the
inverter output of the magnetron filament
terminals to discharge it. Be sure to touch the
chassis ground side first, and then touch the
output terminals.
The microwave oven is a high voltage, high
current appliance. It is free from danger during
ordinary use, but extreme care should be taken
during repair.
CAUTION
Service technicians should remove their
watches whenever working close to or re-
placing the magnetron.
WARNING
There is high voltage present, with high
current capabilities in the circuits of the pri-
mary and secondary windings, the choke
coil, and the heat sink of the inverter. It is
extremely dangerous to work on or near
these circuits with the microwave oven ener-
gized. DO OT measure the voltage in the
high voltage circuit, including the filament
voltage of the magnetron.
WARNING
ever touch any circuit wiring with your
hand, or with an insulated tool during opera-
tion.
WARNING
Before touching any oven components or
wiring, always unplug the oven from its power
source, and discharge the line and high
voltage capacitors.

1-6
MODEL & SERIAL NUMBER DESIGNATIONS
MODEL NUMBER
SERIAL NUMBER
MODEL NUMBER K B M S 1 4 5 4 R S S 0
PRODUCT GROUP
K = KITCHENAID BRAND
PRODUCT IDENTIFICATION
BH = BUILT-IN HIGH SPEED OVEN
BM = BUILT-IN MICROWAVE
CM = COUNTERTOP MICROWAVE
HM = MICROWAVE HOOD
HS = HIGH SPEED
MERCHANDISING SCHEME
S = SENSOR
C = MICRO-CONVECTION
CAPACITY / SIZE / SERIES / CONFIGURATION
05 = 0.5 CU FT 16 = 1.6 CU FT
08 = 0.8 CU FT 17 = 1.7 CU FT
10 = 1.0 CU FT 18 = 1.8 CU FT
13 = 1.3 CU FT 20 = 2.0 CU FT
14 = 1.4 CU FT 22 = 2.2 CU FT
15 = 1.5 CU FT
FEATURES
2 = PLUS FEATURES
5 = DELUXE FEATURES
6 = MICRO-CONVECTION
7 = MICRO-CONVECTION WITH SENSOR
9 = MULTIMODE - HI SPEED - CONVECTION
S = CARRY-IN WARRANTY (EFFECTIVE 02/96)
X = IN-HOME WARRANTY (EFFECTIVE 02/96)
PRODUCT SIZE
0 = 30" WIDE 7 = 27" WIDE
2 = 22" WIDE 8 = 18" WIDE
4 = 24" WIDE 9 = 19" WIDE
6 = 36" WIDE
YEAR OF INTRODUCTION
R = 2005, S = 2006
COLOR CODE
WH = WHITE, BL = BLACK, BT = BISCUIT, SS = STAINLESS STEEL
ENGINEERING CHANGE (0, 1, 2, ETC.)
SERIAL NUMBER XN S 3 8 10006
DIVISION RESPONSIBILITY
XN = NORRKOPING, SWEDEN
YEAR OF PRODUCTION
S = 2005
WEEK OF PRODUCTION
38TH WEEK
PRODUCT SEQUENCE NUMBER