KitchenAid KHMS105E MOTORS

Page 3-9

3-9

Microwave Oven Hood Combo Service Manual — LIT 4317216

Original 03/97

BLOWER MOTOR

FAN MOTOR

SYNCHRONOUS

MOTOR

Blower Motor

—Removes smoke and odors from the kitchen

cooking area through outside venting or recirculation.

Synchronous Motor

—Distributes microwave energy into the

oven during microwave cooking.

Fan Motor

—Cools the magnetron and circulates air through the

oven during microwave cooking.

MOTORS

Contents

Main Page TABLE OF CONTENTS Page IMPORTANT SAFETY INFORMATION Fire Hazard Electrical Shock Hazard WARNING NOTE WARNING CAUTION CAUTION WARNING TO SERVICE TECHNICIANS OR CAUTION WARNING R.F. LEAKAGE TEST CAUTION EQUIPMENT TEST THEORY OF OPERATION 1-2 N L1 4 1 7 N L1 4 1 6 COMPONENT ACCESS COMPONENT SECTIONS GENERAL REMOVING THE MICROWAVE OVEN & CABINET 2-3 THE PROTECTION CONTROL SYSTEM REMOVING THE OVEN DOOR REMOVING THE DOOR CHOKE OVEN DOOR REMOVING THE CONTROL PANEL TURN PANEL OVER MOUNTING SCREW REMOVING THE LINE FUSE REMOVING/ADJUSTING THE INTERLOCK SWITCHES REMOVING A SWITCH FAN COVER INSET 1 2-9 INSET 2 Interlock Switch Wiring MAKING ADJUSTMENTS REMOVING THE BASE THERMAL FUSE REMOVING THE MAGNETRON THERMAL FUSE REMOVING THE CAVITY THERMAL FUSE REMOVING THE CONVECTION THERMISTOR WARNING Page 2-15 2-15 Original 03/97 CONVECTION THERMISTOR WHITE WIRES THE OPERATING CONTROL SYSTEM REMOVING THE OVEN LIGHT SOCKET REMOVING THE CONTROL CIRCUIT BOARD TURN BOARD OVER INSET FAN COVER REMOVING THE TEMPERATURE PROBE SOCKET REMOVING THE FAN MOTOR REMOVING THE POWER CORD REMOVING THE BLOWER MOTOR CAPACITOR REMOVING THE CONVECTION HEATING ELEMENT WARNING Page 2-23 2-23 Original 03/97 VIEWED FROM UNDER TOP PLATE REMOVING THE GAS SENSOR REMOVING THE SYNCHRONOUS MOTOR DISTRIBUTION BLADE INSET 2 MOTOR SHAFT BOTTOM PANEL OF OVEN REMOVING A COOKTOP LIGHT SOCKET COOKTOP LIGHTS BASE PLATE THE HIGH VOLTAGE COMPONENTS ACCESSING THE HIGH VOLTAGE COMPONENTS REMOVING THE MAGNETRON REMOVING THE HIGH VOLTAGE RECTIFIER AND THE HIGH VOLTAGE CAPACITOR Replacing The High Voltage Rectifier Replacing The High Voltage Capacitor 2-31 HIGH VOLTAGE RECTIFIER Removing The High Voltage Rectifier & Capacitor MOUNTING FLANGE REMOVING THE HIGH VOLTAGE TRANSFORMER 3-1 Microwave Oven Hood Combo Service Manual LIT 4317216 COMPONENT DESCRIPTION & TESTING IMPORTANT SAFETY INSTRUCTIONS Warning To Service Technicians! 3-2 CAUTION: REPLACE BLOWN FUSE WITH 15 AMPERE CLASS H FUSE ONLY. Precautions to Avoid Possible Exposure to Excessive Microwave Energy 3-3 THE THERMAL FUSES THE BLOWER MOTOR CAPACITOR R x 10K THE GAS SENSOR TESTING 1. Set the ohmmeter to the R x 1 THE CONVECTION THERMISTOR R x 10K THE CONVECTION HEATING ELEMENT TESTING 1. Set the ohmmeter to the R x 1 MOTORS Page REMOVING THE CONTROL PANEL THINGS TO KNOW LO F TEMP PREHEAT LO F CHARTS Page Page CHECKING THE MICROWAVE POWER OUTPUT CHECKING FOR MICROWAVE ENERGY LEAKAGE EQUIPMENT MAKING THE MEASUREMENTS Measuring The Oven With The Cabinet Installed . Measuring The Oven With The Cabinet Removed MEASURING MICROWAVE POWER OUTPUT USING THE IEC-705 RATING STANDARD 3-19 TEST CHARTS COMPONENT TESTING ELECTRICAL SHOCK HAZARD 3-20 3-21 C. N.C. CONTACTS N.O. CONTACTS 3-22 KEYBOARD MATRIX 3-23 CONTROL CIRCUIT BOARD CHECK LIST 3-25 PRIMARY, MONITOR, & SECONDARY SWITCH CHECKOUT PROCEDURE DOOR CLOSED L1 N DOOR OPEN