KM-30 MICROWAVE OVEN HOOD COMBINATION 8178573
FORWARD This Job Aid, “Whirlpool Microwave Oven Hood Combination,” (Part No. 8178573), provides the In Home Service Professional with information on the operation and service of the Whirlpool Microwave Oven Hood Combination. 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 “Tech Sheet” provided with the microwave oven.
TABLE OF CONTENTS General.................................................................................................................................. 1-1 Important Safety Information............................................................................................. 1-1 Warning to In Home Service Professionals.......................................................................
TABLE OF CONTENTS - CONTINUED Turntable Motor.................................................................................................................. 5-3 Humidity Sensor................................................................................................................ 5-4 Hood Exhaust Fan Motor................................................................................................... 5-4 AC Line Filter............................................................................
General Important Safety Information Electrostatic discharge (esd) sensitive electronic ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. Important safety Instructions • Use an antistatic wrist strap.
Warning to In Home Service Professionals 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. Ieakage exceeds 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.
Precautions To Be Observed Before and During Servicing to Avoid Possible Exposure to Excessive Microwave Energy 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. A. Do not operate or allow the oven to be operated with the door open. B.
R.F. Leakage Test EQUIPMENT NOTE: Enter leakage readings in BEFORE and AFTER spaces on the service document. • Electromagnetic energy leakage monitor (NARDA 81 00B, HOLADAY H 1501 ). 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 microwave oven until it has been repaired completely. • 275 ±15 ML glass beaker.
Whirlpool Model Number Designations M MODEL NUMBER H 2 17 5 X INTERNATIONAL SALES IND. OR MARKETING CHANNEL IF PRESENT PRODUCT GROUP G = WHIRLPOOL GOLD M = MICROWAVE PRODUCT IDENTIFICATION B = BROWNER C = CONVECTION G = GRILL / CRISPER H = OTR HOOD COMBO K = KITS M = GOLD CONVECTION S = STIRRER FAN T = TURNTABLE MODEL VARIATIONS 0-9 CUBIC FEET 04 = .4 CU. FT. 09 = 0.9 CU. FT. 06 = .6 CU. FT. 10 = 1.0 CU. FT. 07 = .7 CU. FT. 12 = 1.2 CU. FT. 08 = .8 CU. FT. 14 = 1.4 CU. FT.
Whirlpool Serial Number Designations SERIAL NUMBER TR T 06 10001 MANUFACTURING SITE TR = Shunde YEAR OF PRODUCTION T = 2006 WEEK OF PRODUCTION 06 = 6th week of the year PRODUCT SEQUENCE NUMBER Model & Serial Number Label and Tech Sheet Locations Model & Serial Number Location Tech Sheet Location (In black poly bag) 1-6
Specifications MODEL MH2175XS SENSOR Cooking Featur e Level/Ser ies White, Black, Biscuit and Stainless Colors CONTROL SYSTEM Timer Limits Operation Display Convection Cooking Cycles Keypad Disable / Child Lockout Mode Cooktop Light Wattage Settings Fan Speed Indication Power Failure Indication Invalid Data Entry Technical Error Indication Diagnostic System Electronic 99 Min. 99 Sec.
MODEL MH1160XSB/Q Feature Level/Series Colors CONTROL SYSTEM Timer Limits Operation Display Convection Cooking Cycles Keypad Disable / Child Lockout Mode Cooktop Light Wattage Fan Speed Indication Power Failure Indication Invalid Data Entry Technical Error Indication Diagnostic System OVEN INTERIOR FEATURES Basic Non Sensor Black, White Electronic 99 Min. 99 Sec.
MH1170XS TMH16XS Basic Non Sensor Black, White, Biscuit and Stainless Basic Non Sensor (B)Black, (Q)White, (D)Silver Electronic 99 Min. 99 Sec. TOUCH CONTROL, Blue Green scrolling text--Dual Language English and French No Yes - Press "Cancel" Key for 3 Seconds One Incandescent 40 Watt bulb "Low-Medium-High"-Scrolling Text Yes - ':' Displayed Flashing "RETRY"-Scrolling Text "F-" With Error Number Yes Electronic 99 Min. 99 Sec.
Whirlpool Microwave Oven Warranty WHIRLPOOL CORPORATION MAJOR APPLIANCE WARRANTY ONE YEAR LIMITED WARRANTY For one year from the date of purchase, when this major appliance is operated and maintained according to instructions attached to or furnished with the product, Whirlpool Corporation or Whirlpool Canada LP (hereafter “Whirlpool”) will pay for FSP® replacement parts and repair labor to correct defects in materials or workmanship. Service must be provided by a Whirlpool designated service company.
Installation Information Hood Fan Motor Mounting Positions RECIRCULATING AIR Airflow towards front of unit. Note: this is the way the unit is shipped. REAR VENTED AIR Airflow towards rear of unit. Unplug wire, turn fan motor over, and plug wire back into the quick disconnect socket over the top of the fan motor. TOP VENTED AIR Airflow towards top of unit.
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THEORY OF OPERATION AirFlow Paths The microwave uses the exhaust blower motor to remove vapors from the cooking area below the unit, it also circulates air within the unit to assist cooking performance and cool the operating components. Cooktop Venting Component cooling This process is accomplished by using one side of the blower motor assembly to pull ambient air into the unit to cool the working components, and the remaining side of the blower for exhausting steam and cooking odors.
Air is circulated in the unit to assist cooking performance. The motor operates at two speeds--low speed all of the time and high speed during sensor-cooking modes.
COMPONENT ACCESS This section instructs you on how to service each component inside the Model MH2175XS Microwave Oven Hood Combination. The components and their locations are shown below. Component Locations PartsLayout (nottoscale) A B X C D E F G H W P5 U 3551 I V U L TS R Q P A. Hood fan motor assembly B. Humidity sensor C. H.V. capacitor D. AC line filter E. Magnetron F. Magnetron thermostat—opens at 257ºF (125ºC), closes at 185ºF (85ºC) G.
Removing the Turntable Motor & Hood (Cooktop) Lamp Assembly 4. Remove the wire from the wire clip towards the middle of the bottom cover. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 5. To remove the turntable motor: a) Remove the glass turntable, roller assembly, and spindle from inside the oven cavity. 1. Unplug microwave oven or disconnect power. 2.
c) Remove the two screws from the turntable motor and remove the motor. f) Remove one screw to remove the lamp socket. NOTE: When reassembling the wire connector onto the turntable motor, make sure the holes of the connector are facing away from the bottom of the unit, outward toward you. 6. To remove the cooktop lamp assembly: a) Remove the one screw to the left of the lamp housing that secures the lamp cover to the bottom of the unit. b) Remove the lamp from the socket.
Removing the Control Panel & Control Board 5. Push the panel up to release the tabs from the slots. Pull the panel away from the microwave unit to gain access to the back side of it. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 6. Disconnect the seven wire connectors from the control board. 1. Unplug microwave oven or disconnect power. 2.
c) Press in on the locking tab end of the arm and lift the arm to release the touch panel ribbon cable. 7. To remove the microcomputer board: a) Remove 2 screws at the top and release 2 tabs at the bottom to be able to lift the top board. Screws d) You can now remove the microcomputer board assembly. e) To remove the microcomputer board mounting bracket release 4 tabs. Tabs b) Remove 5 screws from the bottom board to release it from the touch panel assembly.
Removing the Motor Capacitor and Line Fuse Removing the Door Switches To remove the door switches: 1. Unplug microwave oven or disconnect power. 2. Remove the control panel (see page 4-4). 3. Open the microwave oven door. 4. The Primary interlock switch and Monitor interlock switch are attached to a mounting bracket at the top. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful.
6. To remove a switch assembly, remove the mounting screw from the front panel of the microwave for the desired assembly. 7. Use a flat blade screwdriver to push the latch arm back just far enough to release the mounting tab and remove the assembly from the unit. 10. The Primary interlock switch and Monitor interlock switch are located on opposite sides of their mounting bracket.
Removing the Oven Cavity Lamp and Charcoal Filter To remove the charcoal filter: 1. Unplug microwave oven or disconnect power. 2. Remove the air grille (see page 4-4). 3. Lift the charcoal filter from the mounting frame and pull it out of the microwave unit. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 4. Replace the charcoal filter with the correct replacement filter.
Removing the Oven Rack Retainers IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 2. Open the microwave oven door. 3. Locate the four oven rack retainers, two on each side of the oven interior. 4. Remove the one screw that attaches each rack retainer to the wall of the microwave oven.
Removing the Outer Cabinet 7. After removing all the screws, pull each side out and push it back from the front corners of the unit to release the tabs on the inside front edge of the cabinet. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 8. The cabinet may now be completely removed from the unit. 2.
Removing the Thermostats and Thermistor To remove the magnetron thermostat: 1. Remove 2 screws and disconnect the wire connectors. Wire Connectors Screws IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 2. Remove the outer cabinet (see page 4-10). To remove the Cavity thermostats: 1.
Removing the Magnetron 6. Remove the four T-20 Torx® screws that secure the magnetron to the unit and remove the magnetron. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 2. Remove the outer cabinet (see page 4-10). 3. CAUTION: Discharge the high-voltage capacitor with a 20,000 Ohm resistor to chassis ground. 4.
Removing the High-Voltage Transformer 5. Remove the 2 wire connectors on the front, 1 wire connector from the magnetron and 2 wire connectors from the capacitor. 2 Wire 1 Wire Connectors Connector IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 2. Remove the outer cabinet (see page 4-10). 3.
Removing the High-Voltage Diode and Capacitor To remove the High-Voltage Capacitor: 1. Unplug microwave oven or disconnect power. 2. Remove the outer cabinet (see page 4-10). 3. CAUTION: Discharge the high-voltage capacitor with a 20,000 Ohm resistor to chassis ground. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 4. Remove one screw and slide the tab out from the slot in the unit.
Removing the Oven Cavity Lamp Socket 7. Twist the lamp socket to release it from the one tab on the left side. 8. Remove the two wire connectors and remove the lamp socket from the unit. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 2. Remove the outer cabinet (see page 4-10). 3.
Removing the AC Line Filter 6. When reinstalling the wire connectors to the AC line filter, install the following wires to the following connection spades: 1. Black AC line in 2. White AC line in 3. Black IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 4. Blue Green Ground 1. Unplug microwave oven or disconnect power. 3 1 2. Remove the outer cabinet (see page 4-10). 3.
Removing the Hood Fan Motor and Humidity Sensor To remove the humidity sensor: 1. Unplug microwave oven or disconnect power. 2. Remove the outer cabinet (see page 4-10). 3. CAUTION: Discharge the high-voltage capacitor with a 20,000 Ohm resistor to chassis ground. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 4.
Removing the Fuse Holder & Mounting Bracket 4. Remove the control panel (see page 4-4, steps 2 - 5). 5. Remove the wires from the retainer on the top of the fuse holder mounting bracket. 6. Remove the 2 wire connectors from the fuse holder. IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 1. Unplug microwave oven or disconnect power. 7. Pull the assembly out of the microwave unit. 8.
Removing the Door and Door Disassembly Components of the MHC door (in order of removal.): 1. Choke Seal 2. Inner Door 3. Handle 4. Door Bracket 5. Outer Glass 6. Door Frame 2 IMPORTANT: When you work on the microwave oven, be careful when handling the sheet metal parts. Sharp edges may be present, and you can cut yourself if you are not careful. 4 1 5 3 1. Unplug microwave oven or disconnect power. 2. Remove the air grille (see page 4-4, steps 2 & 3). 6 Choke seal removal: 3.
Inner door removal: This shows the screw locations for each labeled component at the top of the door bracket. The same screws are at the bottom of the bracket, in reverse order. Door bracket removal: 1. Remove two screws that secure the door bracket to the door frame. Refer to the photo in the left column for screw location. Door bracket Door Latch Removal: 1. After removing the Inner door, turn it over. 2. Each door latch is secured with one screw.
COMPONENT TESTING H.V. Transformer Important Before testing any of the components, perform the following checks: • Unplug microwave oven or disconnect power. • Remove the lead wires from the related component before conducting any of the following tests. • Discharge the high-voltage capacitor and remove the lead wires from the primary winding of the high-voltage transformer before conducting any of the following tests.
Magnetron H.V. Capacitor 1. Unplug microwave oven or disconnect power. 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. Check that the seal is in good condition. 2. Remove wire leads. 3. Measure resistance (ohmmeter scale: Rx1): • Filament terminal: Normal: Less than 1 ohm 4. Measure resistance (ohmmeter scale: Rx1k): • Filament to chassis: Normal: Infinite 3.
H.V. Diode Turntable Motor NOTE: Some inexpensive meters may indicate infinite resistance in both directions. 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 1. Unplug microwave oven or disconnect power. 2. Measure resistance (ohmmeter scale: Rx1k): • Forward: Normal: Continuity; Abnormal: Infinite • Reverse: Normal: Infinite; Abnormal: Continuity 3. Measure resistance (ohmmeter scale: Rx1k): • Turntable Motor—Normal: 2.7k-3.
Humidity Sensor Hood Exhaust Fan Motor 1. Unplug microwave oven or disconnect power. 1. Unplug microwave oven or disconnect power. 2. Remove the 3-pin connector from the electronic control (P1). NOTE: Do not remove the attached resistor, which is used for internal resistance calibration. 2. Remove wire leads. 3. Measure resistance across pins 1 & 3, and across pins 2 & 3 (ohmmeter scale: Rx1k): • Normal: 2.8k ohms (approximate) at 77ºF (28ºC) +/- 18ºF (-10ºC) • Abnormal: Infinite 3.
AC Line Filter Thermostats 1. Unplug microwave oven or disconnect power. 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 2. Remove wire leads. 3. Measure resistance (ohmmeter scale: Rx1): • Normal: 1-3 (coil): Less than 1 ohm; 2-4 (coil): Less than 1 ohm; 3-4 (resistor): 550k-800k ohms • Abnormal: Infinite 3.
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DIAGNOSIS & TROUBLESHOOTING Interlock Switch Checkout Procedures Switch Check By Primary Interlock Secondary Interlock Monitor Interlock Door Open Door Closed 1. Unplug microwave oven or disconnect power. 2. Disconnect the wires at the Primary Interlock Switch. 3. Check from the common terminal (black/brown wires) to the normally open terminal (black/white wires). - + 1. Unplug microwave oven or disconnect power. 2. Disconnect the wires at the Primary Interlock Switch. 3.
Touch Panel and Electronic Control Test Touch Panel and Electronic Control Test The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch keypad. To initiate this routine: 1. Press and hold the OFF/CANCEL button while opening the door. While still holding the OFF/CANCEL button, unplug the microwave oven for 2 seconds, then plug it back in. 2. Release the OFF/CANCEL button and close the door.
Microwave Oven Power Output Test 1. Place 8 oz (250 mL) of lukewarm water in the center of the microwave oven. 2. Operate on HIGH power level for 2 minutes. Water should be hot. NOTE: If the water takes longer than 2 minutes to heat, this may indicate either the operating voltage is lower than 110 volts or there is a problem with the microwave oven.
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BK AC 120V/125V 60Hz 4 3BR 7-1 18 R 9BU Cavity Thermostat 1 19 W 12W TTM Turntable Motor Cavity Lamp 1 P2 1P6 BK W HF BU Y R W BU Y BK HL HF (Golden tab) 15Y 5P5 20R Motor Capacitor 28R R 5P6 22W 23BU 26W 10BU 27Y HL Hood (Cooktop) Lamp 11W CL HL 2 1 29W 7 BR GND C F DWG NO. MU-076 H.V. Transformer Magnetron H.V.Diode H.V.
BK AC 120V/125V 60Hz 4 3BR TTM 17R 7-2 HL 9BU 18R (White tab) CL Cavity Thermostat 1 22 W 12 W 19W Cavity Lamp Turntable Motor TT R W BU Y HF 1 2 1 Hood Exhaust Fan Motor 29W Magnetron Thermostat Hood Thermistor P4 4903 24BU Secondary Interlock Switch (White tab) 21W 4P5 P3 1 N1 NFS 13BU CL BK HL Sec. 2 MW-Relay GND C H.V. Transformer Magnetron H.V.Diode H.V.
Strip Circuits Microwave Cooking BR 5P2 L BK Filter OR Fuse 20AMP BK BK Cavity Thermostat 2 BK 3P2 BK MW Relay 4903 2 1 Humidity Sensor BK 1 R 4P5 BU Magnetron Thermostat Secondary H.V. Interlock Transformer Switch BR W BU Cavity Lamp CL Relay 4901 W G Turntable Motor W R R 7P2 TT 2P5 1P5 TTM Relay 4906 P1 Primary Interlock Switch 1P3 6P2 HF Triac 7104 GY BU W BU W CL 1P6 BK BK W W BU BU 2P2 HF Relay 4902 Cavity Thermostat 1 W BU Filter Electronic Control L.V.
Hood Exhaust Fan On High / Medium Electronic Control Cavity Thermostat 2 BK BK BK Filter BK BR L.V. Transformer 5P2 Fuse 20 Amp HF Triac 7104 BU W BU 4P5 G 1P3 Cavity Thermostat 1 BU W BK 2P2 1P6 BU BU HF Relay 4902 Y R Motor Capacitor BK 5P6 HF Filter L Y R N W Microwave Oven Plugged In—Time of Day Displayed L BK Filter BK BK Fuse 20 Amp BK BR Cavity Thermostat 2 Electronic Control L.V.
PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION SOURCES IN THE UNITED STATES: FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION CALL: FOR WHIRLPOOL PRODUCTS: 1-800-253-1301 FOR KITCHENAID PRODUCTS: 1-800-422-1230 FOR ROPER PRODUCTS: 1-800-447-6737 FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER’S HOME CALL: THE TECHNICAL ASSISTANCE LINE: 1-800-253-2870 HAVE YOUR STORE NUMBER READY TO IDENTIFY YOU AS AN AUTHORIZED SERVICER FOR LITERATURE ORDERS: PHONE: 1-800-851-4605 FOR TECHNICAL INFORMATION AND SERVICE PO
