SERVICE MANUAL for the OVER-THE-RANGE MICROWAVE OVEN HOOD COMBINATION 1997 “E” Models March, 1997 Printed in U.S.A.
THIS MANUAL CONTAINS INFORMATION NECESSARY FOR SERVICING THE WHIRLPOOL MICROWAVE OVEN HOOD COMBINATION , MODELS: MH7130XE MH7135XE MH9115XE THE MANUAL IS DESIGNED TO BE USED ONLY BY QUALIFIED SERVICE PERSONNEL. THE SERVICE INFORMATION IS ORGANIZED TO HELP YOU EASILY FIND WHAT YOU NEED. CHECK YOUR LOCAL BUILDING CODE FOR THE PROPER MODE OF INSTALLATION. IN THE ABSENCE OF LOCAL CODES, THIS UNIT SHOULD BE INSTALLED IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE, ANSI/NFPA NO.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page iii TABLE OF CONTENTS Page Important Safety Information ............................................................................................................................... v Theory Of Operation ......................................................................................................................................... 1-1 Component Access ..................................................
Page Component Description & Testing .................................................................................................................. 3-1 Important Safety Instructions .................................................................................................................... 3-1 The Thermal Fuses ..................................................................................................................................... 3-4 The Blower Motor Capacitor ......................
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page v IMPORTANT SAFETY INFORMATION This service manual is intended for factoryservice technicians only. We recommend that customers DO NOT service their own units, because of the complexity and risk of highvoltage electrical shock. WARNING Fire Hazard Do not obstruct the flow of ventilation air. The following information is used throughout this manual, and should be read carefully.
CAUTION WARNING TO SERVICE TECHNICIANS To avoid possible exposure to microwave radiation or energy, visually check the oven for damage to the door and door seal before operating the oven. Use your microwave survey meter to check the amount of leakage before servicing. In the event that the R.F. Ieakage exceeds 4 mw/cm 2 at 5 cm, appropriate repair must be made before continuing to service the unit. Check interlock function by operating the door latch.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page vii CAUTION Whirlpool microwave ovens have a monitoring system designed to assure proper operation of the safety interlock systems. WARNING The interlock monitor switch will immediately cause the oven fuse to blow if the door is opened while the following combined failure exists: DISCONNECT FROM POWER SUPPLY BEFORE SERVICING. CAUTION: HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE.
R.F. LEAKAGE TEST When checking for R.F. Ieakage, use an approved R.F. measuring device to assure less than 4 mw/cm 2 emission at 5 cm distance with a maximum scan rate of 2.5 cm/second, in compliance with U.S. Government Department of Health, Education and Welfare 21 CFR1030, performance Standard for Microwave Ovens. CAUTION EQUIPMENT • Electromagnetic energy leakage monitor (NARDA 8100B, HOLADAY H1501). • 600 ml glass beaker.
Cooking Products Service Manual Original March 1997 4322167 © 1997 Whirlpool Corporation Page 1-1 THEORY OF OPERATION Relay 4 controls the speed of the blower motor through the contol panel. The base thermal fuse will also turn the blower motor on to its low speed if the temperature reaches 133˚F. The schematic configuration for relay 4 is shown in the following diagram. The relay is explained in further detail on the following page. The microwave oven is powered by the 120volt line.
The normally-closed (N.C.) contacts of relay 4 provide a potential circuit for the Base Thermal Fuse. If the base of the oven exceeds 133˚F, the thermal fuse contacts close, and a circuit for the low-speed side of the blower motor is completed, which turns the motor on. The low-speed blower will operate until the base temperature drops below 104˚F and opens the thermal fuse contacts, and turns off.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-1 COMPONENT ACCESS COMPONENT SECTIONS This section instructs you on how to service the individual components in the Microwave Oven Hood Combination.
GENERAL REMOVING THE MICROWAVE OVEN & CABINET WARNING 4. Support the front of the microwave oven and remove the two bolts and washers from the top of the oven. 5. Using two people, remove the microwave oven from its mounting location and set it on a protected (padded) work surface. 6.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation CABINET SCREW VENT GRILLE SCREWS (2) Page 2-3 POWER CORD VENT GRILLE CABINET TAB SLOTS POWER CORD COVER CABINET SCREWS SLOTS BASE PLATE BASE PLATE SCREWS (6) CONNECTORS COOKTOP LIGHT ASSEMBLY WIRING Removing The Cabinet 2-3
THE PROTECTION CONTROL SYSTEM REMOVING THE OVEN DOOR 2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3). Personal Injury Hazard 3. Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock. Open the oven door all the way, then lift the door pins out of the hinge holes and remove it. 4. Install the new oven door and the vent grille on the microwave oven.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-5 REMOVING THE OVEN DOOR COMPONENTS 4. WARNING Personal Injury Hazard To remove the oven door choke, use a putty knife along the edges, and pry the choke out from around the inside window frame. Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock. 1. Disconnect the electrical supply to the microwave oven. 2.
REMOVING THE CONTROL PANEL WARNING 2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3). 3. Remove the screw from the top center tab of the control panel, then lift the panel so that the bottom tabs are out of the slots and pull it forward. 4. Turn the panel over and disconnect the three harness connectors from the board, then set the control panel aside.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-7 REMOVING THE LINE FUSE WARNING 2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3). 3. Remove the control panel from the microwave oven (see page 2-6). 4. From inside the control panel opening, unsnap and open the fuseholder halves. 5. Remove the line fuse from the fuseholder and pull the wire connectors off the ends. 6.
REMOVING/ADJUSTING THE INTERLOCK SWITCHES WARNING 6. One at a time, pull the wire connectors off the defective switch, and reconnect them to the same terminals on the replacement switch. 7. Snap the new switch into place on the switch housing. 8. Mount the interlock switch assembly to the chassis flange with two screws. 9. Close the housing cover and secure it with its mounting screw. Personal Injury Hazard Disconnect from the electrical supply before servicing the unit.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-9 INSET 2 1. PUSH THIS LOCKING ARM BACK TO UNLOCK SWITCH. INSET 1 1. RAISE THIS LOCKING ARM TO RELEASE SWITCH FROM HOUSING. SECONDARY INTERLOCK SWITCH ALL OTHER SWITCHES 2. PRESS BODY IN THIS DIRECTION TO REMOVE SWITCH FROM HOUSING. 2. ROTATE SWITCH ON THIS PIN AND REMOVE SWITCH FROM HOUSING. NOTE: THESE POSTS HOLD THE SWITCH IN PLACE ON THE HOUSING AND ARE STATIONARY.
REMOVING THE BASE THERMAL FUSE WARNING 2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3). 3. Remove the control panel from the microwave oven (see page 2-6). 4. Remove the mounting screws from the base thermal fuse and remove it. 5. Unplug the connectors from the terminals of the base thermal fuse. 6. Install the new base thermal fuse and reassemble the microwave oven.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-11 REMOVING THE MAGNETRON THERMAL FUSE WARNING 4. Unplug the line cord connector and remove the line cord. 5. Unplug the connector from the terminals of the fan motor. 6. Remove the five screws from the air duct. 7. Lift the air duct and position it so that you can access the magnetron thermal fuse, then remove the mounting screw, and unplug the connectors from its terminals. 8.
REMOVING THE CONVECTION THERMISTOR WARNING 5. Remove the screws from the circulation pulley cover and the bracket, then remove the cover and the attached brackets from the top of the oven. Do not remove the brackets from the cover. 6. Remove the screw from the convection thermistor and remove the thermistor. 7. Cut the two white wires (not the thermistor wires) coming from the control board next to the splice. 8. Splice the white wires onto the ends of the new convection thermistor wires.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation BRACKETS CIRCULATION PULLEY COVER WHITE WIRES SENSOR COVER PHILLIPS SCREW CAUTION: WHEN REPLACING THE THERMISTOR, DO NOT CUT AND SPLICE THE WHITE WIRES, OR AN IMPROPER SIGNAL WILL BE SENT FROM THE THERMISTOR TO THE MICROCOMPUTER BOARD CONVECTION THERMISTOR REMOVE FIVE AIR DUCT SCREWS 2-13 Page 2-13
REMOVING THE CAVITY THERMAL FUSE 3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3). Personal Injury Hazard 4. Remove the five screws from the air duct. Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock. 5. Unplug the connectors from the terminals of the cavity thermal fuse, then lift the left side of the air duct, and remove the cavity thermal fuse.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-15 THE OPERATING CONTROL SYSTEM REMOVING THE OVEN LIGHT SOCKET WARNING 4. Remove the mounting screw from the light cover and remove the cover. 5. Remove the bulb from the oven light socket. 6. Cut the wires near the old light socket body. 7. Push the locking tab and turn the socket and remove it from the bracket. 8.
REMOVING THE CONTROL CIRCUIT BOARD & THE TURNTABLE INDICATOR CIRCUIT BOARD WARNING 3. Remove the screw from the top center tab of the control panel, then lift the panel so that the bottom tabs are out of the slots and turn it over. 4. To remove the control circuit board, disconnect the three harness connectors and the ribbon cable (see the inset), and remove the three mounting screws. 5. To remove the turntable indicator circuit board, unplug the connector at CN5, and unsnap it from the locking arms.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-17 REMOVING THE FAN MOTOR WARNING 4. Pull the fan blade and press-on washer off the fan motor shaft. 5. Unplug the connector from the fan motor terminals. 6. Remove the two mounting screws from the fan motor and remove the motor from the air duct. 7. Install the new fan motor in its mounting location and reassemble the microwave oven.
REMOVING THE POWER CORD 3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3). Personal Injury Hazard 4. Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock. Unplug the connector on the old power cord from the air duct connector and install the new power cord. 5. Reassemble the microwave oven. WARNING 1. Disconnect the electrical supply to the microwave oven. 2.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-19 REMOVING THE BLOWER MOTOR CAPACITOR WARNING 2. Remove the microwave oven from its mounting location (see page 2-2). 3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3). 4. Remove the five screws from the air duct. 5. Cut the wires near the body of the blower motor capacitor. 6.
REMOVING THE CONVECTION HEATING ELEMENT WARNING 6. Remove the screw from the gas sensor and position the sensor out of the way. 7. Unhook the drive belt from the circulation fan pulleys and set it aside. 8. Remove the phillips screw from the convection thermistor that is located on the top plate. Remove the thermistor and position it out of the way. 9. Disconnect the wires from the convection heating element terminals.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation UNCLIP ELEMENT HERE HEATING ELEMENT MOUNTING SCREWS HEATING ELEMENT VIEWED FROM UNDER TOP PLATE BRACKETS CIRCULATION PULLEY COVER TOP PLATE MOUNTING SCREWS CONVECTION THERMISTOR GAS SENSOR TOP PLATE SENSOR COVER CONVECTION HEATING ELEMENT REMOVE FIVE AIR DUCT SCREWS 2-21 YELLOW WIRES Page 2-21
REMOVING THE GAS SENSOR WARNING 2. Remove the microwave oven from its mounting location (see page 2-2). 3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3). 4. Remove the five screws from the air duct, then lift the duct and postion it so you can access the gas sensor. 5. Remove the screw from the gas sensor board and remove it from the sensor cover, then unplug the connector from the control board. 6.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-23 REMOVING THE STIRRER MOTOR WARNING 2. Remove the microwave oven from its mounting location (see page 2-2). 3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3). 4. Remove the five screws from the air duct and lift the duct just enough to access the stirrer motor, then unplug the connector from the stirrer motor terminals. 5.
REMOVING THE TURNTABLE MOTOR WARNING 3. Remove the base plate from the microwave oven and unplug the cooktop light connector (see the illustration on page 2-3). 4. Unplug the connector and remove the two mounting screws from the turntable motor, then remove the motor from the bottom of the microwave oven. 5. Mount the new turntable motor and reassemble the microwave oven. Personal Injury Hazard Disconnect from the electrical supply before servicing the unit.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-25 REMOVING THE COOKTOP LIGHT SOCKETS WARNING Personal Injury Hazard 3. Remove the bulbs from the sockets and unplug the socket wire connector from the microwave oven. 4. To remove the sockets, press the locking tabs near the base of each socket, and twist the socket until the tabs align with the slots in the bracket, then remove the sockets from the bracket. 5.
THE HIGH VOLTAGE COMPONENTS ACCESSING THE COMPONENTS The components for service in this section include the: WARNING Magnetron High Voltage Rectifier High Voltage Capacitor High Voltage Transformer Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock. The locations of the high voltage components are shown below. All of the high voltage components are accessible through the front control panel cutout.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-27 REMOVING THE MAGNETRON WARNING 2. Discharge the high-voltage capacitor. 3. Remove the microwave oven from its mounting location, then remove the vent grille and the cabinet from the oven (see pages 2-2 and 2-3). 4. Remove the control panel from the microwave oven (see page 2-6). 5.
REMOVING THE HIGH VOLTAGE RECTIFIER AND THE HIGH VOLTAGE CAPACITOR WARNING 2. Discharge the high-voltage capacitor. 3. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3). 4. Remove the control panel from the microwave oven (see page 2-6). 5. From inside the control panel opening, remove the screw from the capacitor bracket, and remove the bracket and capacitor so that you can access the capacitor terminals. 6.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 2-29 REMOVING THE HIGH VOLTAGE TRANSFORMER WARNING WARNING Personal Injury Hazard Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock. Disconnect from power supply before servicing.
— NOTES — 2-30
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-1 COMPONENT DESCRIPTION & TESTING IMPORTANT SAFETY INSTRUCTIONS CAUTION Warning To Service Technicians! To avoid possible exposure to microwave radiation 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.
Whirlpool microwave ovens have a monitoring system designed to assure proper operation of the safety interlock systems. The interlock monitor switch will immediately cause the oven fuse to blow if the door is opened and the primary door interlock switch and/or the secondary interlock switch contacts fail in a closed position. CAUTION: REPLACE BLOWN FUSE WITH 15 AMPERE CLASS H FUSE ONLY.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation CAUTION Page 3-3 WARNING • High voltages are present during the cook cycle. Extreme caution should be observed at all times. • Disconnect the oven from electrical supply before servicing. Failure to do so could result in electrical shock or death. • Abrasive cleansers, steel-wool pads, gritty wash cloths, etc. can damage the control panel and the interior and exterior oven surfaces.
THE THERMAL FUSES There are three thermal fuses in the OTR Microwave Oven. They are: the magnetron thermal fuse, the cavity thermal fuse, and the base thermal fuse. The magnetron and cavity thermal fuses are located inside the highvoltage section of the oven. These two thermal fuses are normally-closed, and will open at a set temperature to disable the oven. Both of these fuses are resettable. The base thermal fuse is located directly behind the control panel.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-5 THE BLOWER MOTOR CAPACITOR The blower motor capacitor is located below the air duct at the indicated location. It is in use any time the blower (vent) motor is oper- ating. The capacitor helps to maintain a constant voltage to the blower motor so that it runs more efficiently. AIR DUCT BLOWER MOTOR CAPACITOR TESTING 1. Set the ohmmeter to the R x 10K scale. 2. Measure across the capacitor terminals.
THE GAS SENSOR depending upon the humidity of the oven. Changing humidity conditions, due to the cooking process within the oven cavity, causes a difference in potential between these two circuits. This difference is monitored by the microcomputer during cooking, allowing the microcomputer to determine the proper cook time. The gas sensor is used during the “Sensor Cook” operation of the oven. It is located above the oven and is mounted on the left side of the sensor cover.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-7 THE CONVECTION THERMISTOR thermistor signal going back to the microcomputer causes the heater relay to open and close, and cycles the heating element on and off. The convection thermistor is located under the circulation pulley cover and is used during the convection operation of the oven. When the temperature increases, the resistance of the thermistor decreases.
THE CONVECTION HEATING ELEMENT and the heater relay on the microcomputer board. During a convection, or combination cooking cycle, the heater cycles on and off to maintain the programmed cavity temperature. The heating element surrounds the convection fan blade and is not visible through the oven cavity. The 1400-watt convection heating element is located under the circulation pulley cover and the top plate. The heating element heats the air that is distributed into the oven cavity by the convection fan.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-9 MOTORS Blower Motor —Removes smoke and odors from the kitchen cooking area through outside venting or recirculation. Fan Motor —Cools the magnetron and circulates air through the oven during microwave cooking. Stirrer and Turntable Motors —Distribute microwave energy evenly during microwave cooking.
PROGRAMMING CHECKS TOUCH PANEL CONTINUITY TEST 1. Unplug the microwave oven’s power supply cord. 2. Open the oven door. 3. Plug the power cord back into the AC receptical.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-11 CHARTS PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION Line fuse blows when power cord is plugged into a wall receptacle. Shorted wire in power cord, wiring harness, or overload circuit. 1. Oven will not operate. 1. No power at wall plug. 1. 2. Open wire in power cord or wiring harness. Control board. Line fuse. Thermal fuses. 2. 3. 4. 5. Check fuse or breaker box.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION Little or no heat is produced in the oven load. 1. High voltage transformer. 1. 2. Rectifier diode. 2. 3. High voltage capacitor. 3. 4. 5. Magnetron. Power selector. 4. 5. 1. Primary interlock switch. 1. 2. Shorted wire harness. 2. Oven lamp goes on with the door open, but the light goes out when the door is closed with the control on. 1. Secondary interlock. 1. Check secondary interlock.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-13 PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION Blower motor will not operate. 1. 2. 3. Blower motor. Control board. Open or loose wiring in circuit to blower motor. 1. 2. 3. Check blower motor. Check control board. Use ohmmeter to check continuity, and repair wiring. Cooktop lamps do not come on. 1. 2. 3. 4. Bulb burned out. Control board. Lamp sockets.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION Console will not display data, or has incorrect data. 1. No power at wall plug. 1. 2. 3. 4. 2. 3. 4. 5. Open line fuse. Thermal fuse. Thermal fuse on magnetron. Interlock safety switches. 6. Control board. 6. Check fuse or breaker box. Replace line fuse. Check thermal fuse. Check magnetron thermal fuse. Check interlock safety switches. Replace, if defective. Check control board. Erratic console display during operation. 1. Magnetron. 1.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-15 CHECKING FOR MICROWAVE ENERGY LEAKAGE When checking for R.F. Ieakage, use an approved R.F. measuring device to assure less than 4 mw/cm 2 emission at 5 cm distance with a maximum scan rate of 2.5 cm/second, in compliance with U.S. Government Department of Health, Education and Welfare 21 CFR1030, performance Standard for Microwave Ovens.
MAKING THE MEASUREMENTS To measure for oven leakage: Measuring The Oven With The Cabinet Installed 1. Pour 275 (±25cc) of water into a 600 cc graduated beaker. 2. Place the beaker into the center of the microwave oven. 3. Set the energy leakage monitor to 2,450 MHz, and use it according to the manufacturer’s recommended test procedure to obtain the correct results. 4. Measure the microwave radiation with an electromagnetic radiation monitor.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation MEASURING MICROWAVE POWER OUTPUT USING THE IEC-705 RATING STANDARD Page 3-17 • The time (in seconds) for the temperature of the water to rise by a value of 10˚C ±2˚ is measured. The initial and final water temperatures are selected so that the maximum difference between the final water temperature, and the ambient temperature, is 5˚C.
COMPONENT TESTING FILAMENT WINDING WARNING HIGH VOLTAGE TRANSFORMER ELECTRICAL SHOCK HAZARD DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHEN REMOVING THE CABINET FROM THE OVEN. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR, AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. SECONDARY WINDING PRIMARY WINDING TEST CHARTS COMPONENT High-Voltage Transformer (with wire leads unplugged). Magnetron (with wire leads unplugged).
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation COMPONENT TEST PROCEDURE High-Voltage Capacitor Terminal-To-Terminal Set the ohmmeter to the R x 10 k scale, and measure the resistance across the capacitor terminals. Page 3-19 RESULT a) Normal - The meter indicates several ohms, then gradually returns to infinity. b) Abnormal - The meter indicates infinity, or zero ohms (a short) immediately.
COMPONENT TEST PROCEDURE Switches (with wire leads removed). All of the switches are measured in the same manner. N.O. and C Terminals Set the ohmmeter to the R x 1 scale, and measure the resistance between the normally-open (N.O.) and the common (C) terminals of the switch. N.C. CONTACTS C. RESULT a) Normal - The meter indicates infinity. b) Abnormal - The meter indicates zero ohms (a short). N.O. CONTACTS N.C.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 3-21 COMPONENT TEST PROCEDURE Convection Thermistor Set the ohmmeter to the R x 10 K scale. Remove the 6-pin connector from the circuit board and measure across terminals 5 & 6. a) Normal = 155 K to 350 K ohms @ 68˚F. b) Abnormal = Infinity, or zero ohms (a short). Convection Heating Element (with leads disconnected) Set the ohmmeter to the R x 1 scale, and measure across the terminals.
COMPONENT TEST PROCEDURE Touch Keyboard (see below). Measure the resistance between the terminal pins of the keypad (shown below) that you wish to check. For example: To measure the “CLOCK” keypad, refer to the illustration, and: 1.Find the first terminal number along the top bar (pin 5). 2.Find the second terminal number in the side bar (pin 8). 3.Set the ohmmeter to the R x 1 scale. a) Touch the ohmmeter leads between pins 5 and 8 on the ends of the FPC connector. b) Press the CLOCK keypad.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation COMPONENT TEST PROCEDURE Relay 2 (RY2) Set the ohmmeter to the R x 1 scale, and check for continuity between the two relay terminal pins. Use the following steps. 1.Remove the wire connectors from the relay terminals. 2.Use a pair of alligator clips, and clip the ohmmeter leads to the two terminals of the relay. Make sure that you do not allow the clips to short to anything. 3.
PRIMARY, MONITOR, & SECONDARY SWITCH CHECKOUT PROCEDURE NOTE: The following chart and strip circuits show the continuity and position of the door switches when the microwave oven door is open and closed. CONTINUITY TEST CHART DOOR OPEN DOOR CLOSED Disconnect the 3-pin connector CN3 from the control module. Check from the pink wire (pin 1) to the blue wire (pin 3). – + Disconnect the wires at the Secondary Interlock Switch.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 4-1 TECH TIPS WIRING DIAGRAMS Models MH7130XE & MH7135XE BK MICROCOMPUTER BOARD 20A LINE FUSE BK BK BLOWER (VENT) MOTOR HI LOW MAGNETRON THERMAL FUSE (109˚C/228˚F) BK RD 1 LOW-VOLTAGE TRANSFORMER W 3 RD GN C RD CAVITY THERMAL FUSE (110˚C/230˚F) VR1 3 2 1 N 3 2 1 L RD RELAY 2 W W BL BK Y 1 2 3 4 5 6 1 2 3 4 5 6 BL W RD 6 mF CAP RELAY 1 BR 5 COOKTOP LIGHTS W OVEN LIGHT RELAY 3 7 W
Model MH9115XE MAGNETRON THERMAL PROTECTOR MICROCOMPUTER BOARD BK CAVITY THERMAL PROTECTOR BK 15A LINE FUSE BK BK W N L W GN RD BL RELAY #2 W 1 COOKTOP LIGHTS W BL LOW-VOLTAGE TRANSFORMER W RD RD W 2 OVEN LIGHT PK 3 RELAY #1 RD (NC) (C) W BL PK (C) RELAY #3 FAN MOTOR BK BL 5 RELAY #4 BLOWER MOTOR BR 6 (LOW) BASE THERMAL PROTECTOR YL (HI) RD BR YL MONITOR SWITCH (NC) BR 1 2 BL RD (C) BK 8 3 W TURNTABLE MOTOR RELAY #6 4 BR YL (C) BK HIGH-VOLTAGE TRANSFO
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 4-3 STRIP CIRCUITS 1. UNIT IS PLUGGED IN — CLOCK IS WORKING L1 N MICROCOMPUTER BOARD 20A LINE FUSE BK BK BK RD MAGNETRON THERMAL FUSE RD 3 LOW-VOLTAGE TRANSFORMER W 1 CAVITY THERMAL FUSE 2. DOOR IS OPEN — OVEN LIGHT IS ON L1 N MICROCOMPUTER BOARD 20A LINE FUSE BK RD BK RD MAGNETRON THERMAL FUSE 3 LOW-VOLTAGE TRANSFORMER 1 CAVITY THERMAL FUSE OVEN LIGHT RELAY 1 5 BR/RD/BK W/BL 3.
4. BLOWER MOTOR IS ON “HIGH” N L1 MICROCOMPUTER BOARD 20A LINE FUSE BK RD BK RD MAGNETRON THERMAL FUSE 3 LOW-VOLTAGE TRANSFORMER CAVITY THERMAL FUSE W 1 CAPACITOR RD Y RELAY 4 BL BK 13 (HIGH) (C) BLOWER MOTOR 5.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 4-5 7. MICROWAVE COOKING IS ON N L1 MICROCOMPUTER BOARD BK RD BK BK MAGNETRON THERMAL FUSE LOW-VOLTAGE TRANSFORMER 3 W W 1 CAVITY THERMAL FUSE OVEN LAMP W/BL BK STIRRER MOTOR W RELAY 1 FAN MOTOR BR 5 W SECONDARY SWITCH 20A LINE FUSE RD TURNTABLE MOTOR BK RELAY 5 7 RELAY 2 BK RD W W HV SECTION 8.
SPECIFICATIONS Rated Power Consumption ...................... 1500-watts, maximum (microwave oven only). 1750-watts, maximum (microwave oven, cooktop lamps, ventilation fan). Microwave Output ...................................... 850-watts (IEC 705 Test Procedure). Adjustable 85-watts through 850-watts in 10-steps. Frequency ................................................... 2450 MHz ±50 MHz. Power Supply ............................................. 120-volts ±12-volts AC, 60 Hz. Rated Current...........
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation Page 4-7 SPECIFICATION CHARTS MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB CONTROL SYSTEM: Timer: Yes Yes Yes Type Electronic Electronic Electronic Limits 99 Min. - 99 Sec. 99 Min. - 99 Sec. 99 Min. - 99 Sec.
MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB No No No Type No No No Range No No No Scale No No No Levels No No No Operation No No No Timed Override No No No Yes Temperature Sensor Probe: Exhaust Fan: Yes Yes High Yes Yes Yes Low Yes Yes Yes Manual Off Yes Yes Yes Auto Off Yes Yes Yes Automatic Turn On At 133˚F/56˚C. Automatic Turn On At 133˚F/56˚C. Automatic Turn On At 133˚F/56˚C.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation MODEL NUMBER Page 4-9 MH7130XEQ MH7130XEZ MH7135XEB 19" W x 8-9/16" H x 14-5/8" D 19" W x 8-9/16" H x 14-5/8" D 19" W x 8-9/16" H x 14-5/8" D 1.3 Cubic Feet 1.3 Cubic Feet 1.
MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB 29-15/16" W x 16-7/16" H x 15-3/8" D 29-15/16" W x 16-7/16" H x 15-3/8" D 29-15/16" W x 16-7/16" H x 15-3/8" D White Textured Unitized Chassis With Wrapper & Mounting Plate Painted Steel - Matte Gray Almond Textured Unitized Chassis With Wrapper & Mounting Plate Painted Steel - Matte Gray Black Textured Unitized Chassis With Wrapper & Mounting Plate Painted Steel - Matte Black High Gauge Steel - No Embossments High Gauge Steel - No Embossments High Gaug
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation MODEL NUMBER MH7135XEQ MH9115XEB Page 4-11 MH9115XEQ CONTROL SYSTEM: Timer: Yes Yes Yes Type Electronic Electronic Electronic Limits 99 Min. - 99 Sec. 99 Min. - 99 Sec. 99 Min. - 99 Sec.
MODEL NUMBER MH7135XEQ MH9115XEB No Yes Yes No Electronic Electronic Range No 90˚ F - 200˚F 90˚ F - 200˚F Scale No Digital Digital Levels No 111 111 Operation No Direct Entry Direct Entry Temperature Sensor Probe: Type Timed Override MH9115XEQ No 60 Min. If No Increase In Temp. Occurs 60 Min. If No Increase In Temp. Occurs Yes Yes Yes High Yes Yes Yes Low Yes Yes Yes Manual Off Yes Yes Yes Auto Off Yes Yes Yes Automatic Turn On At 133˚F/56˚C.
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation MODEL NUMBER Page 4-13 MH7135XEQ MH9115XEB MH9115XEQ 19" W x 8-9/16" H x 14-5/8" D 18-3/16" W x 8-5/32" H x 12-5/8" D 18-3/16" W x 8-5/32" H x 12-5/8" D 1.3 Cubic Feet 1.1 Cubic Feet 1.
MODEL NUMBER MH7135XEQ MH9115XEB MH9115XEQ 19" W x 8-9/16" H x 14-5/8" D 29-7/8" W x 16-3/16" H x 14" D 29-7/8" W x 16-3/16" H x 14" D White Textured Unitized Chassis With Wrapper & Mounting Plate Painted Steel - Matte Gray Black Textured Unitized Chassis With Wrapper & Mounting Plate Painted Steel - Matte Black White Textured Unitized Chassis With Wrapper & Mounting Plate Painted Steel - Matte Gray High Gauge Steel - No Embossments High Gauge Steel - No Embossments High Gauge Steel - No Embossm
Cooking Products Service Manual Original March, 1997 4322167 © 1997 Whirlpool Corporation MODEL & SERIAL NUMBER EXPLANATION MODEL NUMBER M H 7 13 0 X E Q 0 INTERNATIONAL SALES IND. OR MARKETING CHANNEL, IF PRESENT PRODUCT GROUP M = MICROWAVE PRODUCT IDENTIFICATION B = BROWNER C = CONVECTION G = GRILL / CRISPER H = OTR HOOD COMBO K = KITS S = STIRRER FAN T = TURNTABLE MODEL VARIATIONS 0-9 CUBIC FEET 04 = .4 CU. FT. 06 = .6 CU. FT. 07 = .7 CU. FT. 08 = .8 CU. FT. 09 = .9 CU. FT. 10 = 1.0 CU. FT.
WHIRLPOOL MICROWAVE HOOD WARRANTY LENGTH OF WARRANTY ONE YEAR FULL WARRANTY From Date of Installation. SECOND THROUGH FIFTH YEAR LIMITED WARRANTY From Date of Installation. WHIRLPOOL WILL PAY FOR: FSP® replacement parts and repair labor costs to correct defects in materials or workmanship. Service must be provided by an authorized Whirlpool service company. Replacement of microwave magnetron tube on microwave oven to correct defects in materials or workmanship.
