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Summary of Contents for Sub-Zero Wolf Drop-Down Door Series
- Page 1 subzero.com 800.222.7820 MDD Microwave Service Manual General Information Controls & Operation Component Access & Removal Troubleshooting Guide Technical Data Wiring Diagrams...
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Page 2: General Information
Sub-Zero Group, Inc. Neither this manual nor any information or images contained herein may be copied or used in whole or in part without the express written permission of Wolf Appliance, Inc., an affiliate of Sub-Zero Group, Inc. © Wolf Appliance, Inc., all rights reserved. - Page 3 Microwave Drop-Down Door Series Microwave Drop-Down Door Series General Information MICROWAVE FEATURES RATING PLATE LOCATION • • Distinct styles to compliment the look of Wolf “E” and “M” series ovens. • Bottom hinged door. • Large-capacity interior. • Sensor cooking to monitor and adjust settings. •...
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Page 4: Microwave Measurement
Microwave Drop-Down Door Series Microwave Drop-Down Door Series General Information MICROWAVE MEASUREMENT After adjustment or replacement of the door latch switches, monitor switch, or the door is completed individually or collectively, the following leakage test must be performed. The survey instrument and the result must meet the requirements of the performance standard for microwave ovens. -
Page 5: Model Number Key
Microwave Drop-Down Door Series Microwave Drop-Down Door Series General Information MODEL NUMBER KEY Refer to this key for an example of the model numbers. Model: ICB MDD 30 PM / S / PH International Designation Product Size Model Unit Style Handle Style Product MDD = Microwave Drop-Down Door Size... - Page 6 Microwave Drop-Down Door Series Microwave Drop-Down Door Series General Information 24” Transitional 30” Contemporary MDD24TE/S/PH MDD30CM/B/TH Description: Microwave Drop-Down Door, 30”, Contemporary “M” Series, Black Glass, Tubular Handle Description: Microwave Drop-Down Door, 24”, Transitional “E” Series, Stainless Steel, Professional Handle #826151 - Revision A - March, 2016...
- Page 7 Microwave Drop-Down Door Series Microwave Drop-Down Door Series General Information 30” Professional 30” Transitional MDD30PM/S/PH MDD30TM/S/TH Description: Microwave Drop-Down Door, 30”, Description: Microwave Drop-Down Door, 30”, Professional “M” Series, Stainless Steel, Professional Transitional “M” Series, Stainless Steel, Tubular Handle Handle MDD30PE/S/PH MDD30TE/S/TH Description: Microwave Drop-Down Door, 30”,...
- Page 8 Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation CONTROLS This section describes the basic operation of the Drop-Down Door Microwave and how the touch panel assembly responds to input commands. Panel Assembly TIMER CLOCK The clock must be set prior to use and after a power outage.
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Page 9: Controls And Operation
Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation COOK TIME COMPLETION REMINDER Upon completion, the microwave oven chimes every ten seconds for the first minute; then every three minutes (for one hour) until STOP/CLEAR is touched. To eliminate reminder: Touch SETTINGS twice - control panel display scrolls “... -
Page 10: Control Lock
Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation CONTROL LOCK The control lock feature prevents unwanted microwave oven operation. To lock: Touch CONTROL LOCK Touch START LOCK ON appears on the control panel display To unlock: Touch CONTROL LOCK Touch START LOCK OFF appears on the control panel display... - Page 11 Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation BEVERAGE The beverage feature reheats a beverage or prepare hot water for coffee or tea. To use beverage: Touch BEVERAGE To reheat beverage: Touch 1 Touch INCREASE or DECREASE to select amount in 1/2 cup increments, up to 2 cups For hot water: Touch 2 Touch INCREASE or DECREASE to select amount in 1 cup increments, up to 6 cups...
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Page 12: Add Minute
Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation SOFTEN The soften feature softens ice cream, cream cheese or butter. To use soften: Touch SOFTEN For ice cream: Touch 1 Touch INCREASE once for 1 pint or twice for 1/2 gallon For cream cheese: Touch 2 For butter:... - Page 13 Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation GOURMET The Gourmet feature detects moisture and humidity from food as it heats and automatically adjusts cook time and power level. Fresh vegetables and poultry have two options. Follow directions on the control panel display to select the desired option.
- Page 14 Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation COOLING FAN For cook times in excess of 3 minutes, the cooling fan continues to operate for up to 2 minutes after cook time is complete. MULTIPLE SEQUENCE COOKING The microwave oven can be programmed for up to four automatic cooking sequences, switching from one power level to another automatically.
- Page 15 Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation DOOR OPENED DURING COOKING • When the door is opened during a cooking cycle the switches change (normally open - NO): CONDITION DURING DOOR OPEN COOKING (NO COOKING) SWITCH CONTACT...
- Page 16 Microwave Drop-Down Door Series Microwave Drop-Down Door Series Controls & Operation Controls & Operation PRIMARY/SECONDARY INTERLOCK AND DOOR SENSING SWITCHES • When the microwave door is closed, the COM-NO contacts must be closed • When the microwave door is opened, the COM-NO contact must be open MONITOR SWITCH •...
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Page 17: Component Removal
Component Removal Microwave Drop-down Door Series Microwave Drop-down Door Series COMPONENT REMOVAL This section explains how to remove components from a Wolf Drop-down Door Microwave. Depending on which component you are going to remove, you may have to remove other components first. Refer to the appropriate sec- tion in this manual that explains how to remove those various components. - Page 18 Microwave Drop-down Door Series Component Removal Microwave Drop-down Door Series Control Panel Assembly T-20 Security Torx To remove the control panel assembly, first uninstall or pull the microwave forward three inches, then (See T-20 Torx Figure 3-1): 1. Use a T-20 Security Torx drive to extract screw from the center of the control cover.
- Page 19 Component Removal Microwave Drop-down Door Series Microwave Drop-down Door Series Power Cord To remove the power cord, first remove the fan motor Noise Filter cover, then (See Figure 3-4): 1. Disconnect the black wire from the L terminal and the white wire from the N terminal on the noise filter board.
- Page 20 Microwave Drop-down Door Series Component Removal Microwave Drop-down Door Series Complete Door Assembly The choke cover seal, choke cover, and the latch hooks can be removed with the door in place. To remove the door panel, hinges, complete handle, or door assembly the door must be removed.
- Page 21 Component Removal Microwave Drop-down Door Series Microwave Drop-down Door Series Door To remove the door, first uninstall the unit, then (See Figure 3-10): 1. Place the unit on it’s back. 2. Use a T-20 Torx drive to extract the screws from each hinge.
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Page 22: Hinge Assembly
Microwave Drop-down Door Series Component Removal Microwave Drop-down Door Series Hinge Assembly To remove the hinge assembly, first remove the door panel, then (See Figure 3-13): 1. Use a T-20 Torx drive to extract the screws from the door panel. 2. - Page 23 Component Removal Microwave Drop-down Door Series Microwave Drop-down Door Series Control Board Unit Control To remove the control board, first remove the outer Bracket Support wrapper, then (See Figure 3-15): 1. Use a T-10 Torx drive to extract the screws from the control board.
- Page 24 Microwave Drop-down Door Series Component Removal Microwave Drop-down Door Series High Voltage (HV) Rectifier HV Rectifier To remove the HV rectifier, first remove the outer wrap- per, then (See Figure 3-16): HV Capacitor 1. Use a T-20 Torx drive to extract the screw from the Cushion HV rectifier ground lead.
- Page 25 Component Removal Microwave Drop-down Door Series Microwave Drop-down Door Series Thermal Cut-out (TCO) - Magnetron To remove the TCO, first remove the outer wrapper, then (See Figure 3-19): 1. Disconnect the wires from the terminals of the TCO. 2. Use a T-10 Torx drive to extract the screw from the TCO.
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Page 26: Fan Motor
Microwave Drop-down Door Series Component Removal Microwave Drop-down Door Series Left Air Separator Fan Motor To remove the fan motor, first remove the outer wrap- Right Air Separator per, then (See Figure 3-21): 1. Use a T-20 Torx drive to extract the screws from the left air separator. - Page 27 Component Removal Microwave Drop-down Door Series Microwave Drop-down Door Series LED Light Assembly To remove the LED light assembly, first remove the outer wrapper, then: 1. Disconnect the wire harnesses from the control board (See Figure 3-24). 2. Remove the control board. 3.
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Page 28: Turntable Motor
Microwave Drop-down Door Series Component Removal Microwave Drop-down Door Series LED Light Assembly - continued 17. Press the tab on the left of the LED light assembly to the right (See Figure 3-27). 18. Remove the LED light assembly from the bracket. Turntable Motor To remove the turntable motor, first uninstall the microwave, then (See Figure 3-28):... -
Page 29: Troubleshooting
Troubleshooting Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series CHECKS AND WARNINGS 3E Checks In the following test procedures and warnings perform the steps below when ever “3E Checks” are called for. Disconnect from the power supply. Wedge the door open. Discharge the high voltage capacitor. - Page 30 Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series Troubleshooting #826151 - Revision A - March, 2016...
- Page 31 Troubleshooting Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series Microwave Output Power Perform this test with the microwave fully assembled. Measure output power from the magnetron with a water temperature rise test. Use this test to confirm proper performance after completing service repairs Verify the microwave cavity is clean, and that the supply voltage is about 117 VAC.
- Page 32 Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series Troubleshooting TEST COMPONENT TEST PROCEDURE MAGNETRON TEST Perform 3E Checks (page 4-2) Remove wires from magnetron Test for continuity between magnetron filament terminals. Measurement should be less than 1 ohm. Test for a short circuit, by measuring the resistance between either filament terminal and the magnetron case.
- Page 33 Troubleshooting Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series TEST COMPONENT TEST PROCEDURE Perform 3E Checks (page 4-2) HIGH VOLTAGE CAPACITOR TEST Isolate the HV capacitor from the HV circuit Discharge the HV capacitor Measure the resistance of the HV capacitor a.
- Page 34 Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series Troubleshooting TEST COMPONENT TEST PROCEDURE Perform 3E Checks (page 4-2) BROKEN 20 AMP FUSE If the 20 amp fuse is broken when the door is opened, check the primary latch switch and monitor switch. Replace defective switch(es) and 20 amp fuse.
- Page 35 Troubleshooting Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series TEST COMPONENT TEST PROCEDURE Perform 3E Checks (page 4-2) MOTOR WINDING TEST Disconnect wires from the motor Measure the resistance between motor terminals Resistance of Motor Motor Resistance Fan Motor About 15 Ohms Turntable Motor About 12 - 15 Ohms...
- Page 36 Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series Troubleshooting TEST COMPONENT TEST PROCEDURE The microwave should be fully assembled. AH SENSOR TESTS The microwave must be plugged in for at least two minutes before sensor cooking. Room temperature can not exceed 95° F. The microwave can not be installed in any area where heat and/or steam is generated.
- Page 37 Troubleshooting Microwave Drop-down Door Series Troubleshooting Microwave Drop-down Door Series TEST COMPONENT TEST PROCEDURE TESTING METHOD FOR AH To determine if the sensor operation is defective, the simplest method is SENSOR to replace the sensor with a new sensor. Perform 3E Checks (page 4-2) Remove the AH Sensor Install a new AH Sensor Perform 4R Checks (4-2) except for testing for microwave power.
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Page 38: Technical Data
Technical Data Microwave Drop-down Door Series Microwave Drop-down Door Series Unit Specifications Rating Power Supply 120 VAC, 60 Hz, Single Phase, three wire ground Unit Amp Draw 13.5 amps Microwave Rating 900 Watts Power Consumption 1.3 kW Operating Frequency 2450 MHz Timer 0 to 99 minutes and 99 seconds Components... - Page 39 Wiring Microwave Drop-Down Door Series Microwave Drop-Down Door Series WIRING DIAGRAM MODELS: MDD24TE-S-TH - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. &...
- Page 40 Microwave Drop-Down Door Series Wiring Microwave Drop-Down Door Series WIRING DIAGRAM - This wiring information is provided for use by qualified service personnel only. MODELS: MDD30CM-B-TH - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. - Failure to observe the above warnings may result in severe electrical shock.
- Page 41 Wiring Microwave Drop-Down Door Series Microwave Drop-Down Door Series WIRING SCHEMATICS MODELS: MDD24TE-S-TH - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. &...
- Page 42 Microwave Drop-Down Door Series Wiring Microwave Drop-Down Door Series WIRING SCHEMATICS MODEL: MDD30CM-B-TH - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. - Failure to observe the above warnings may result in severe electrical shock.
- Page 43 Wiring Microwave Drop-Down Door Series Microwave Drop-Down Door Series WIRING SCHEMATICS CONTROL UNIT PWB - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. - Failure to observe the above warnings may result in severe electrical shock.
- Page 44 Microwave Drop-Down Door Series Wiring Microwave Drop-Down Door Series WIRING SCHEMATICS DISPLAY UNIT PWB - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. MDD24 &...
- Page 45 Wiring Microwave Drop-Down Door Series Microwave Drop-Down Door Series WIRING SCHEMATICS DISPLAY UNIT PWB - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before begining service. - Be sure all grounding devices are connected when service is complete. MDD30CM - Failure to observe the above warnings may result in severe electrical shock.
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