KitchenAid KAC-48 User manual

TECHNICAL EDUCATION
JOB AID 4317414
KAC-48
MICROWAVE OVEN /
HOOD COMBINATION
MODEL: KHMS1850S

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WHIRLPOOL CORPORATION assumes no responsibility for any repairs made on
our products by anyone other than authorized In-Home Service Professionals.
FORWARD
This KitchenAid Job Aid, “Microwave Oven / Hood Combination” (Part No. 4317414) provides
the In-Home Service Professional with information on the installation, operation, and service of
the Microwave Hood Combination. For specific information on the model being serviced, refer
to the Use and Care Guide or Tech Sheet provided with the Microwave Oven / Hood Combina-
tion.
The Wiring Diagram and Strip 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 OBJECTIVES
The goal of this Job Aid is to provide information that will enable the In-Home Service Profes-
sional to properly diagnose malfunctions and repair the KitchenAid Microwave Oven / Hood
Combination.
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 oven to its proper operational status.
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Copyright ©2007, Whirlpool Corporation, Benton Harbor, MI 49022

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TABLE OF CONTENTS
Page
GENERAL .............................................................. 1-1
Microwave Oven Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Precautions to Be Observed Before and During Servicing to Avoid
Possible Exposure to Excessive Microwave Energy. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Model and Serial Number Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Model and Serial Number Label and Tech Sheet Locations . . . . . . . . . . . . . . . . . . . . . . . 1-4
Specifications .......................................................... 1-5
INSTALLATION INFORMATION ............................................. 2-1
InstallationRequirements................................................. 2-1
InstallationInstructions................................................... 2-3
PRODUCT OPERATION.................................................... 3-1
PartsandFeatures...................................................... 3-1
MicrowaveOvenControl.................................................. 3-2
COMPONENT ACCESS .................................................. 4-1
ComponentLocations.................................................... 4-1
Removing a Hood Lamp Socket and Bottom Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
RemovingtheCabinet.................................................... 4-4
Removing Cavity Thermostat #3 and the Humidity Sensor. . . . . . . . . . . . . . . . . . . . . . . . 4-5
RemovingtheHoodExhaustFanMotor...................................... 4-8
Removing the Cavity Lamp Holder, the Stirrer Motor
andCavityThermostat#2............................................... 4-9
Removing Cavity Thermostat #1, the Motor Capacitor,
the AC Line Filter and the Power Supply Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Removing the Electronic Control Board and the Touch Control Assembly . . . . . . . . . . . 4-14
Removing the Primary, Secondary and Monitor Interlock Switches . . . . . . . . . . . . . . . . 4-16
Removing the Line Fuse Holder and the Magnetron Thermostat . . . . . . . . . . . . . . . . . . 4-18
Removing the Cooling Fan Motor and the Exhaust Fan Thermostat . . . . . . . . . . . . . . . 4-19
Removing High-Voltage Diode and the Power Resistor . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Removing the High-Voltage Capacitor and the Magnetron . . . . . . . . . . . . . . . . . . . . . . . 4-21
Removing the High-Voltage Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
RemovingtheTurntableMotor ............................................ 4-25
Removing the Oven Door and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

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COMPONENT TESTING ................................................... 5-1
Thermostats............................................................ 5-1
HumiditySensor ........................................................ 5-2
Hood Exhaust Fan Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
StirrerMotor............................................................ 5-3
MotorCapacitor......................................................... 5-3
ACLineFilter........................................................... 5-4
DoorInterlockSwitches................................................... 5-4
LineFuse.............................................................. 5-5
CoolingFanMotor....................................................... 5-5
High-VoltageDiode...................................................... 5-6
PowerResistor ......................................................... 5-6
High-VoltageCapacitor................................................... 5-7
Magnetron............................................................. 5-7
High-VoltageTransformer................................................. 5-8
TurntableMotor......................................................... 5-8
DIAGNOSTICS AND TROUBLESHOOTING ................................... 6-1
Primary, Secondary and Monitor Interlock Switch Checkout Procedure . . . . . . . . . . . . . . 6-1
FailureCodeIndications.................................................. 6-2
Touch Panel and Electronic Control Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
MicrowaveOvenPowerOutputTest......................................... 6-4
WIRING DIAGRAM AND STRIP CIRCUITS .................................... 7-1
WiringDiagram......................................................... 7-1
StripCircuits ........................................................... 7-2
Page

1-1
GENERAL
MICROWAVE OVEN SAFETY
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on your appliance.
Always read and obey all safety messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word
“DANGER” or “WARNING.” 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
immediately follow instructions.
You can be killed or seriously injured if you don’t
follow instructions.
DANGER
WARNING

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PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
a) Do not operate or allow the oven to be operated with the door open.
b) Make the following safety checks on all ovens to be serviced before activating the
magnetron or other microwave source, and make repairs as necessary:
1. Interlock Operation
2. Proper Door Closing
3. Seal and Sealing Surfaces (Arcing, Wear and Other Damage)
4. Damage to or Loosening of Hinges and Latches
5. Evidence of Dropping or Abuse
c) Before turning on microwave power for any service test or inspection within the microwave
generating compartments, check the magnetron, waveguide or transmission line, and
cavity for proper alignment, integrity and connections.
d) Any defective or misadjusted components in the interlock, monitor, door seal, and micro-
wave generation and transmission systems shall be repaired, replaced, or adjusted by
procedures described in service 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.
f) Do not attempt to operate the oven if the door glass is broken.

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MODEL AND SERIAL NUMBER DESIGNATIONS
MODEL NUMBER
SERIAL NUMBER
SERIAL NUMBER TR T 44 10023
MANUFACTURING SITE
TR = SHUNDE, CHINA
YEAR OF PRODUCTION
T = 2007
WEEK OF PRODUCTION
44TH WEEK
PRODUCT SEQUENCE NUMBER
MODEL NUMBER K HM S 18 5 0 S BL 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
S = 2007
COLOR CODE
WH = WHITE, BL = BLACK, SS = STAINLESS STEEL
ENGINEERING CHANGE (0, 1, 2, ETC.)

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MODEL AND SERIAL NUMBER LABEL AND
TECH SHEET LOCATIONS
The Model/Serial Number label and Tech Sheet locations are shown below.
Model/Serial Number Label
Tech Sheet Location
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.
WARNING

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SPECIFICATIONS
Model KHMS1850SBL/WH/SS
Control System
Timer Electronic
Limits 99 min. 99 sec.
Scale Linear (Digital)
Operation Touch Control, Pads TBD
Display 5 + 2 Digit - Blue-Green
Clock Yes
Independent Minute Timer Yes
Stage Cooking Yes (3)
In-Use Reprogramming Yes
More/Less Function Yes - Hidden “Cook Power” Button
Keypad Disable/Control Lockout Mode Yes - Press “OFF/Cancel” Key For 5 Seconds
Cook Power Yes (10 Levels)
Exhaust Fan Yes - 1-Key Operation
Number of Speeds 5 (including Off)
Manual Off Yes
Automatic Turn-On @ 140°F/60°C
Cooktop Light Halogen
Settings 3 Levels (High, Night, Off)
Stoppable Turntable Function / Button Yes
Oven Interior Features
Size (Inches) 22 7/8˝W x 9 1/2˝H x 14 1/2˝D
Size (Metric) 581 mm W x 241 mm H x 368 mm D
Capacity 1.8 Cu. Ft.
Finish Powder Coating
Cooking Power 1000 Watts
Glass Turntable Diameter 12˝
Ventilation Standard Air Flow System
Cooling Fan Automatic: On if Oven Is Operating; Off If Door Is Open
Door Features
Side Swing Left-Hand (Hinge Side)
Seals Two-Stage
Microwave System
Distribution Top Feed w/ Stirrer
Magnetron Standard Transformer
Safety Features
Interlock 3 Door/Latch Operated Primary, Secondary and Monitor
Thermal Protectors 5 - 1 Magnetron, 1 Oven Cavity, 1 Hood, 2 Wave Guide

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Ventilation System
Type Convertible Recirculation or Exhaust Vertical/Horizontal
Recirculation CFM Out 162
Exhaust CFM Out 200
Touch Control 4-Speed
Auto On/High Speed Yes: 140°F / 60°C
Damper Yes
Grease Filter Yes (2)
Charcoal Filter Yes - Behind Mesh Filter Under Unit
Blower Type Twin Squirrel Cage
Shipped Recirculation Mode
Exterior Features
Outside Dimensions (Inches) 30˝x 18˝x 17 1/4˝
Outside Dimensions (Metric) 762 mm x 457 mm x 438 mm
Power Cord Length 3 Feet
Other Specications
Electrical 120 VAC, Single Phase, 60 Hz
1500 Watts, For Use With 15-20 Amp Circuit
Domestic Use Only Yes
Agency Approvals FCC, DHHS, CDRH, UL
Net Weight (Approx.) 73 Lbs.
Literature
Use & Care Guide #8206647
Cooking Guide (Label) #8206649
Installation Instructions #8206650
Warranty 1 Year Full; 2-5 Year Limited, Magnetron Tube
Tech Sheet #8206648
Job Aid #4317414