Wolf MWD24-2 Service Manual
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Wolf MWD24-2 Service Manual

Drawer microwave
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Technical Service

Manual
Drawer Microwave
Models: MWD24-2 & MWD30-2
© WOLF APPLIANCE, INC.
2009 ALL RIGHTS RESERVED
JOB AID #813632
Revision B - December, 2009

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Summary of Contents for Wolf MWD24-2

  • Page 1: Technical Service

    Technical Service Manual Drawer Microwave Models: MWD24-2 & MWD30-2 © WOLF APPLIANCE, INC. 2009 ALL RIGHTS RESERVED JOB AID #813632 Revision B - December, 2009...
  • Page 3 Drawer Microwave General Information (Models MWD24-2 / MWD30-2) SECTION 1 GENERAL INFORMATION #813632 - Revision B - December, 2009...

  • Page 4: Introduction

    Wolf appliance units by anyone other than Authorized Service Technicians. The information and images contained in this manual are the copyright property of Wolf appliance, 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 consent of Wolf Appliance, Inc.©, all rights reserved.

  • Page 5: Table Of Contents

    Drawer Microwave General Information (Models MWD24-2 / MWD30-2) TABLE OF CONTENTS Page # Page # Section 1 - General Information Section 4 - Component Access and Removal Introduction ................1-2 Warnings and Cautions ............4-2 Important Safety Information ..........1-2 Precautions For Using Lead-Free Solder ......4-3 Technical Assistance ............1-2...

  • Page 6: Warranty Information

    (Models MWD24-2 / MWD30-2) WARRANTY INFORMATION This page contains a summary of the 2 & 5 Year Warranty that is supplied with every Wolf product, followed by a Non Residential Warranty Summary and then notes about the warranties. TWO & FIVE YEAR Warranty Summary •...
  • Page 7 (Models MWD24-2 / MWD30-2) DRAWER MICROWAVE FEATURES • Built-in microwave oven with 950 watts of power • 30” (762mm) model allows microwave to be built in to fit below a Wolf built-in E-Series oven • Classic stainless steel finish • Sensor cooking •...
  • Page 8 General Information Drawer Microwave (Models MWD24-2 / MWD30-2) COOKWARE SUGGESTIONS NOTE: Make sure the utensil does not touch the interior walls during cooking. Use these utensils for safe microwave cooking and reheating: • Glass ceramic • Heat-resistant glass • Microwave-safe plastics •...

  • Page 9: Section 2 - Installation Information

    Drawer Microwave Installation Information (Models MWD24-2 / MWD30-2) SECTION 2 INSTALLATION INFORMATION #813632 - Revision B - December, 2009...

  • Page 10: Electrical Requirements

    Below are the Product Safety Labels used in this manual. This section of the manual covers some of the installation issues that a service technician may need to know when servicing a Wolf Drawer Microwave. If additional installa- tion information is needed, after reviewing this section of the manual, please refer to the installation guide or contact the Wolf Appliance Customer Service Department.

  • Page 11: Clearances And Dimensions

    Drawer Microwave Installation Information (Models MWD24-2 / MWD30-2) Clearances and Dimensions 4-11/16" (119) 21-19/32" (548) 1-23/32" (44) Dimensions shown on this page must be used. Given dimensions provide minimum clearance. Locate electri- cal outlet in the shaded area in the upper left hand cor- ner of the cutout (See Figures 2-2, 2-3, 2-4 &...
  • Page 12 Installation Information Drawer Microwave (Models MWD24-2 / MWD30-2) A = 23-1/2"(597) Depth Min B = Allow 3/4"(19) Overlap A = Allow 3/4"(19) Overlap C = Allow 7/16"(11) Overlap B = 23-1/2"(597) Depth Min D = 14-13/16"(376) Opening C = Allow 3/4"(19) Overlap E = Allow 3/16"(5) Overlap...
  • Page 13 Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) SECTION 3 THEORY OF OPERATION #813632 - Revision B - December, 2009...

  • Page 14: User Operation

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) USER OPERATION Before operating drawer microwave, make certain you read and understand the operation instructions completely. Before the drawer microwave can be used, follow these steps: 1. Plug in drawer microwave.

  • Page 15: Stop/Clear Feature

    Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) STOP/CLEAR FEATURE (See Figure 3-4): Touch the STOP/CLEAR pad to: • Erase if you make a mistake during programming. • Cancel timer. • Stop the drawer microwave temporarily during timed cooking.

  • Page 16: Sensor Cooking

    Figure 3-8. Setting the POWER LEVEL SENSOR COOKING Wolf’s sensor is a semi-conductor device that detects the vapor (moisture and humidity) emitted from the food as it heats. The sensor adjusts the cooking times and power levels for various foods and quantities.

  • Page 17: Sensor Popcorn And Sensor Reheat Feature

    Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) SENSOR POPCORN AND SENSOR REHEAT FEATURE (See Figure 3-10): You can pop popcorn and reheat many foods and don’t need to calculate cooking time or power level. NOTE: The SENSOR POPCORN setting has two choices. Follow directions in the display to choose desired option.

  • Page 18: Defrost Feature

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) DEFROST FEATURE (See Figure 3-12): Use this feature to defrost the foods shown in the Defrost Guide (See Use and Care Manual page 21). 1. Touch DEFROST pad. will appear. Select desired food by touching num-...

  • Page 19: Micro Warm Feature

    Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) MICRO WARM FEATURE (See Figure 3-14): MICRO WARM allows you to keep food warm for up to 30 minutes. DIRECT USE: 1. Touch MICRO WARM pad. will appear in the display.

  • Page 20: Setup/Help Feature

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) MULTIPLE SEQUENCE COOKING (See Figure 3-16): Your drawer microwave can be programmed for up to 4 automatic cooking sequences, switching from one power level setting to another automatically. Sometimes cooking directions tell you to start on one power level and then change to a different power level.

  • Page 21: Start/Add Minute

    Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) START/ADD MINUTE FEATURE (See Figure 3-18): The START/ADD MINUTE feature allows you to cook for a minute at 100% (HIGH) power level. By simply touching the START/ADD MINUTE pad, will appear in the display and start cooking automatically. You can also...

  • Page 22: Audible Signal Elimination

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) AUDIBLE SIGNAL ELIMINATION (See Figure 3-21): At the end of timed cook, a series of beeps will sound. If you wish to have the appliance with no audible signals, you can turn the audible signals off.

  • Page 23: Auto Start

    Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) AUTO START (See Figure 3-23): If you wish to program the drawer microwave to begin cooking automatically at a designated time of day: 1. Touch SETUP/HELP pad 4 times. The display shows...

  • Page 24: Technical Operation

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) TECHNICAL OPERATION (See Figure 3-25): NOTE: The following is a description of component functions during oven operation. Off Condition: Closing the drawer activates the door sensing switch and secondary interlock switch. (In this condi- tion, the monitor switch contacts are opened.) When the oven is plugged in, 20 vac is supplied to the control unit...

  • Page 25: Cooking Condition

    Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) COOKING CONDITION Program desired cooking time by touching the NUMBER pads. Program the power level by touching the POWER LEVEL pad and then a number pad. When the START pad is touched, the following operations occur: 1.

  • Page 26: Sensor Cooking Condition

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) SENSOR COOKING CONDITION Using the SENSOR function, food is cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results.
  • Page 27 Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) H.V RECTIFIER CAPACITOR xxx µF AC 2300V POWER TRANSFORMER THIRD DOOR SWITCH WHITE RED or BLACK/BROWN SECONDARY INTERLOCK SWITCH WHITE NOTES: CONTROL • Circuits and wire colors UNIT are subject to change without notice.

  • Page 28: Humidity Sensor Circuit

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) HUMIDITY SENSOR CIRCUIT A. Structure of Humidity Sensor (See Figure 3-31): Ventilation opening The humidity sensor includes two thermistors. One for sensing thermistor is housed in the closed vessel filled with dry air while another in the open vessel.
  • Page 29 Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL: The touch control section consists of the following units. • Key Unit • Control Unit • Power Unit The principal functions of these units and the signals communicated among them are explained below.

  • Page 30: Description Of Lsi

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) DESCRIPTION OF LSI (IC-1) The I/O signal of the LSI is detailed in the following table: Pin No. Signal Description 1- 3 Terminal to Change Cooking Input According to the Model: By using A/D con- verter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.
  • Page 31 Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) Pin No. Signal Description COM0 Common Data Signal: Connected to LCD signal C4. Connected VC (+5V). 29 - 31 P27- P25 Terminal not used. SEG20 Segment Data Signal: Connected to LCD segment S24.
  • Page 32 Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) Pin No. Signal Description Magnetron High-Voltage Circuit Driving Signal: To turn on and off cook relay (RY2), in 100% power operation, the signals holds “H” level during microwave cook- ing and “L” level while not cooking. In other cooking modes (90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, 0%) the signal turns to “H”...
  • Page 33 Drawer Microwave Theory of Operation (Models MWD24-2 / MWD30-2) Pin No. Signal Description Signal to Sound Buzzer: 0.1 sec A: Key touch sound. B: Completion sound. 2.0 sec C: When the oven stops so that the food can be checked in Automatic cooking mode.

  • Page 34: Drawer Microwave (Models Mwd24-2 /

    Theory of Operation Drawer Microwave (Models MWD24-2 / MWD30-2) 3-22 #813632 - Revision B - December, 2009...

  • Page 35: Section 4 - Component Access And Removal

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) SECTION 4 COMPONENT ACCESS AND REMOVAL #813632 - Revision B - December, 2009...
  • Page 36 Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) COMPONENT ACCESS AND REMOVAL This section explains how to adjust, access and remove components in a Drawer Microwave Oven. An attempt has been made to arrange these procedures in such a way as to simulate which components would need to be removed first in order to gain access to other components.

  • Page 37: Precautions For Using Lead-Free Solder

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) Before servic- Rectifier ing, capacitor Capacitor must be dis- charged by shorting con- necting lead of rectifier White against chas- sis with an insulated screwdriver. Chassis Figure 4-1. Discharge Capacitor PRECAUTIONS FOR USING LEAD-FREE SOLDER 1.

  • Page 38: Microwave Measurement Procedure

    Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) MICROWAVE MEASUREMENT PROCEDURE 1. Requirements: A. Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

  • Page 39: Touch Control Panel Servicing

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components: This unit uses CMOS LSI in the integral part of the cir- cuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals.

  • Page 40: Drawer Microwave Disassembly

    Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) 4. Other Precautions: • Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity. • Connect the connectors of the key unit to the control unit being sure that the lead wires are not twisted.

  • Page 41: Upper Cabinet Component Replacement

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) Upper Cabinet Component Replacement: (Sensor, Stirrer Motor, Upper Thermal Limiter) 1. Drawer Microwave must be removed from its instal- lation. See Drawer Microwave Disassembly (page 4- 6) steps 1-3. Screw 2. Wait 60 Sec. to discharge High Voltage Capacitor.

  • Page 42: Switch (Stop, Monitor, Secondary Interlock) Removal

    Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) Stop Switch, Secondary Interlock Switch and Monitor Switch Removal: Mounting Screw 1. Follow the Drawer Microwave disassembly as previ- (holding Switch in) ously stated on page 4-6, steps 1-3. 2. Open the drawer and keep it open.

  • Page 43: Switch (Stop, Monitor, Secondary Interlock) Adjustment

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) Stop Switch, Secondary Interlock Switch and Monitor Switch Adjustment: 1. Follow the Drawer Microwave disassembly as previ- Loosen screws ously stated on page 4-6. 2. Open the drawer and keep it open.

  • Page 44: Drawer Assembly And Choke Cover Removal

    Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) Drawer Assembly and Choke Cover Removal: 1. Follow the Drawer Microwave disassembly as previ- ously stated on page 4-6. 2. Open the drawer and keep it open. 3. To discharge the high voltage capacitor, wait for 60 g l e seconds.

  • Page 45: Actuator Removal

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) After Reassembly, Do The Following: A. Make sure that drawer sensing switch, secondary interlock switch and monitor switch are operating properly. (Refer to section 5, Troubleshooting Guide "Test Procedures".) B. An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.

  • Page 46: Auto Drawer Removal / Installation

    Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) Auto Drawer Gear Removal/Installation: Bottom of Unit NOTES: • This procedure requires a 14" or greater phillips Screw screwdriver. • The MWD30-2 auto drawer gear can be pulled straight out, after removing screws holding gear to cavity.

  • Page 47: Rack Gear Removal

    Drawer Microwave Component Access (Models MWD24-2 / MWD30-2) Rack Gear Removal: Bottom 1. Follow the Drawer Microwave disassembly as previ- Drawer ously stated on page 4-6. Support 2. Open the drawer and keep it open. 3. To discharge the high voltage capacitor, wait for 60 seconds.
  • Page 48 Component Removal Drawer Microwave (Models MWD24-2 / MWD30-2) 4-14 #813632 - Revision B - December, 2009...

  • Page 49: Section 5 - Troubleshooting Guide

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) SECTION 5 TROUBLESHOOTING GUIDE #813632 - Revision B - December, 2009...
  • Page 50 Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) TROUBLESHOOTING AND TECHNICAL DATA This section of the manual Component Test Procedures. NOTE: Before continuing, please take note of the WARNINGS and CAUTIONS below. • TO AVOID ELECTRIC SHOCK DURING TROUBLESHOOTING, NEVER TOUCH ANY PART OF THE ELECTRI- CAL CIRCUIT WITH HANDS OR UN-INSULATED TOOLS WHILE THE POWER IS CONNECTED.

  • Page 51: Microwave Measurement Procedure

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) MICROWAVE MEASUREMENT PROCEDURE Requirements: 1. Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

  • Page 52: Touch Control Panel Test

    Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST TOUCH CONTROL PANEL ASSEMBLY TEST: The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.

  • Page 53: Key Unit Test

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST Power Unit or Touch Control Transformer: (Cont.) 1. Fan motor, stirrer motor, oven lamp or electrical parts do not turn on or do not turn off. 2. Digital display on the control unit does not show anything.

  • Page 54: Relay Test

    Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST RELAY TEST: 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the leads to the primary of the power transformer.

  • Page 55: Defrost Test

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST DEFROST TEST: THE OVEN SHOULD BE FULLY ASSEMBLED BEFORE ATTEMPTING THE FOL- LOWING PROCEDURE. 1. Place one cup of water in the center of the tray in the oven cavity.
  • Page 56 Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST PROCEDURES TO BE TAKEN WHEN THE FUSE ON THE PRINTED WIRING BOARD (PWB) IS OPEN: To protect the electronic circuits, this model is provided with a fuse added to the primary on the PWB.

  • Page 57: Ah Sensor Test

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST AH SENSOR TEST: Checking the initial sensor cooking condition THE OVEN SHOULD BE FULLY ASSEMBLED BEFORE ATTEMPTING THE FOL- LOWING PROCEDURE. 1. The oven should be plugged in at least two minutes before sensor cooking.
  • Page 58 Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT: (Cont.) To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor.

  • Page 59: Magnetron Assembly Test

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST 10. Disconnect the power supply cord, and then remove covers. (Cont.) 11. Open the drawer and block it open. 12. Discharge high voltage capacitor. 13. Disconnect the dummy resistor circuit from the sensor connector of control panel.

  • Page 60: Microwave Output Power

    Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST MICROWAVE OUTPUT POWER: (Cont.) • THE OVEN SHOULD BE FULLY ASSEMBLED BEFORE ATTEMPTING THE FOLLOWING PROCEDURE. • HIGH VOLTAGES ARE PRESENT DURING COOK CYCLE, SO EXTREME CAU- TION SHOULD BE OBSERVED.

  • Page 61: Thermal Cut-Out Test

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST THERMAL CUT-OUT TEST: 1. Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approxi- mately 293°F(145°C).

  • Page 62: Monitor Switch Test

    Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST MONITOR SWITCH TEST: 1. Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. Before performing this test, make sure that the secondary interlock switch, according to the above Switch Test Procedure.

  • Page 63: Blown Monitor Fuse Test

    Drawer Microwave Troubleshooting Guide (Models MWD24-2 / MWD30-2) PROCEDURE LETTER COMPONENT TEST BLOWN MONITOR FUSE TEST: 1. Disconnect the power supply cord. 2. Open the drawer and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds.
  • Page 64 Troubleshooting Guide Drawer Microwave (Models MWD24-2 / MWD30-2) 5-16 #813632 - Revision B - December, 2009...

  • Page 65: Section 6 - Wiring Diagrams

    Drawer Microwave Wiring Diagrams (Models MWD24-2 / MWD30-2) SECTION 6 WIRING DIAGRAMS #813632 - Revision B - December, 2009...
  • Page 66 Wiring Diagrams Drawer Microwave (Models MWD24-2 / MWD30-2) DRAWER MICROWAVE HARNESS PINOUT Power Supply cord 120V 60Hz NOISE FILTER TO BACK PLATE BOARD CN502 (SWITCHING POWER SUPPLY) BLK or CN502 CN501 MAGNETRON OVEN THERMAL CUT-OUT THERMAL CUT-OUT RED or YLW or N.O.

  • Page 67: Power Unit Circuit

    Drawer Microwave Wiring Diagrams (Models MWD24-2 / MWD30-2) DRAWER MICROWAVE POWER UNIT CIRCUIT CN-A D1--D4 PA154DR 1N4002Lx4 2.5A CN-H FUSE AC 120V VRS1 60Hz 10G471K - IF NOTSPECIFIED, 1SS270A - NOT INSERT PARTS - CHECK POINTS SW Reg. 502-3 SW Reg. OUT...

  • Page 68: Control Unit Circuit

    Wiring Diagrams Drawer Microwave (Models MWD24-2 / MWD30-2) DRAWER MICROWAVE CONTROL UNIT CIRCUIT #813632 - Revision B - December, 2009...

  • Page 69: Printed Wiring Board Of Power Unit

    Drawer Microwave Wiring Diagrams (Models MWD24-2 / MWD30-2) PRINTED WIRING BOARD OF POWER UNIT N.O. COM. N.O. COM. FUSE 2.5A #813632 - Revision B - December, 2009...

  • Page 70: Printed Wiring Board Of Control Unit

    Wiring Diagrams Drawer Microwave (Models MWD24-2 / MWD30-2) PRINTED WIRING BOARD OF CONTROL UNIT #813632 - Revision B - December, 2009...

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