Wolf MWD24 Technical Service And Parts Manual
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Wolf MWD24 Technical Service And Parts Manual

Wolf MWD24 Technical Service And Parts Manual

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Technical Service And Parts Manual
Drawer Microwave
MODELS MWD24 & MWD30
© WOLF APPLIANCE, INC.
2009 ALL RIGHTS RESERVED
JOB AID #813632
Revision A - January 2009

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  • Page 1 Technical Service And Parts Manual Drawer Microwave MODELS MWD24 & MWD30 © WOLF APPLIANCE, INC. 2009 ALL RIGHTS RESERVED JOB AID #813632 Revision A - January 2009...
  • Page 3 Drawer Microwave General Information SECTION 1 GENERAL INFORMATION...

  • Page 4: Introduction

    7:00 AM to 7:00 PM Central Time Monday through Friday This manual is designed to be used by Authorized Service Personnel only. Wolf Appliance, Inc. assumes no responsibility for any repairs made to Wolf appliances by anyone other than Authorized Service Technicians.

  • Page 5: Table Of Contents

    Drawer Microwave General Information TABLE OF CONTENTS Section 1 - General Information Section 5 -Parts and Exploded Views Introduction................ 1-2 Parts List ................5-2 Important Safety Information..........1-2 Exploded View ..............Technical Assistance............1-2 Table of Contents............... 1-3 Section 6 - Troubleshooting Guide Warranty Information............

  • Page 6: Warranty Information

    General Information 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 7 950 watts of power Control Panel Menu Label • 30” (762) model allows micro- wave to be built in to fi t below a Wolf built-in E-Series oven • Classic stainless steel fi nish Sealing Surfaces • Sensor cooking •...
  • Page 8 Drawer Microwave General Information COOKWARE SUGGESTIONS CLEANING AND CARE NOTE: Make sure the utensil does not touch the interior Stainless Steel Surface walls during cooking. The exterior should be wiped often with a soft damp Use these utensils for safe microwave cooking and cloth and polished with a soft dry cloth to maintain its reheating: beauty.

  • Page 9: Section 2 - Installation Information

    Drawer Microwave Installation Information SECTION 2 INSTALLATION INFORMATION...

  • 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 installation 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 " (119) " (119) " (548) " (714) " (44) 2" (51) " " (391) (391) " " (371) (371) 15” (381) 15” (381) Auto Drawer Auto Drawer Opening Opening " " (594) (594) " (29) "...
  • Page 12 Drawer Microwave Installation Information 6" (152) ELECTRICAL OUTLET LOCATION ANTI-TIP BLOCK " 5" (127) (89) 4" " (722) (102) " (376) ALLOW OPENING TO BOTTOM " OF ANTI-TIP ALLOW OVERLAP " (19) BLOCK OVERLAP " (376) " (597) OPENING ALLOW DEPTH MIN 36"...

  • Page 13: Section 3 -Theory And Operation

    Drawer Microwave Theory of Operation SECTION 3 THEORY AND OPERATION...

  • Page 14: User Operation

    Drawer Microwave Theory of Operation USER OPERATION OPEN/CLOSE DRAWER MICROWAVE Always press the OPEN or CLOSE pad on the control BEFORE OPERATING panel to open or close the drawer microwave. Before operating your new drawer microwave, make Do not push or pull the drawer microwave by hand, certain you read and understand the operation except in case of emergency, such as a power failure.

  • Page 15: Sensor Cooking

    Theory of Operation SENSOR COOKING SENSOR POPCORN / SENSOR REHEAT Wolf’s sensor is a semi-conductor device that detects the You can pop popcorn and reheat many foods and don’t vapor (moisture and humidity) emitted from the food as it need to calculate cooking time or power level.

  • Page 16: Manual Defrost / Manual Cooking

    Drawer Microwave Theory of Operation MANUAL DEFROST MANUAL COOKING If the food that you wish to defrost is not listed on the Enter desired cooking time and power level. Defrost Guide or is above or below the limits in the Touch MICRO WARM pad.

  • Page 17: Add Minute

    Drawer Microwave Theory of Operation To restore sound: ADD MINUTE Touch SETUP/HELP pad. ADD MINUTE allows you to cook for a minute at 100% by simply touching the ADD MINUTE pad. You can Display shows - touch again also extend cooking time in multiples of 1 minute by Touch SETUP/HELP pad again.

  • Page 18: Technical Operation

    Drawer Microwave Theory of Operation TECHNICAL OPERATION The monitor switch electrically monitors the operation NOTE: The following is a description of component of the secondary interlock switch and secondary functions during oven operation. interlock relay and is mechanically associated with OFF CONDITION: the drawer so that it will function in the following sequence.

  • Page 19: Schematic (Off Condition)

    Drawer Microwave Theory of Operation Schematic (Off Condition) Figure 3-1...
  • Page 20 Drawer Microwave Theory of Operation SENSOR COOKING CONDITION COOKING SEQUENCE Using the SENSOR function, food is cooked without Touch one of the SENSOR pads. ¿ guring time, power level or quantity. When the oven NOTE: The oven should not be operated on sensor senses enough steam from the food, it relays the immediately after plugging in the unit.

  • Page 21: Sensor Circuit

    Drawer Microwave Theory of Operation HUMIDITY SENSOR CIRCUIT Structure of Humidity Senso With this voltage given, the switches SW3-9 to SW5 in the LSI are turned on in such a way as to change the re- The humidity sensor includes two thermistors as shown sistance values in parallel with R45 ~ R49.
  • Page 22 Drawer Microwave Theory of Operation TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. Power Source Circuit This circuit generates voltages necessary in the Key unit control unit from the AC line voltage. In addition, the Control Unit synchronizing signal is available in order to compose Power unit...

  • Page 23: Description Of Lsi

    Drawer Microwave Theory of Operation DESCRIPTION OF LSI (IC-1) The I/O signal of the LSIis detailed in the following table. Pin No. Signal Description 1 - 3 AN5- AN3 Terminal to change cooking input according to the Model. By using A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.
  • Page 24 Drawer Microwave Theory of Operation 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. Signal coming from touch key. When any one of J-4 line keys on key matrix is touched, a corresponding signal from P10- P17 will be input into P23.
  • Page 25 Drawer Microwave Theory of Operation Pin No. Signal Description Magnetron high-voltage circuit driving signal. Microwave cooking mode Other cooking mode To turn on and off the cook relay(RY2). In 100% VARI MODE ON TIME OFF TIME ON TIME OFF TIME 100% power 32 sec.
  • Page 26 Drawer Microwave Theory of Operation NOTES 3-14...
  • Page 27 Drawer Microwave Access & Removal SECTION 4 COMPONENT ACCESS & REMOVAL...

  • Page 28: Section 4 - Component Access And Removal

    Drawer Microwave Access & Removal 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 fi...
  • Page 29 Drawer Microwave Access & Removal Figure 4-1 Discharging High Voltage Capacitor PRECAUTIONS FOR USING LEAD-FREE SOLDER Employing lead-free solder The “Main PWB” of this model employs lead-free solder. This is indicated by the “LF” symbol printed on the PWB and in the service manual. The suffi x letter indicates the alloy type of the solder. Example: Indicates lead-free solder of tin, silver and copper.

  • Page 30: Microwave Measurement Procedure

    Drawer Microwave Access & Removal MICROWAVE MEASUREMENT PROCEDURE Requirements: Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 4-4mW/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 31: Touch Control Panel Servicing

    Drawer Microwave Access & Removal TOUCH CONTROL PANEL SERVICING Precautions for Handling Electronic Components: A. On some models, the power supply cord between This unit uses CMOS LSI in the integral part of the the touch control panel and the oven itself is so circuits.

  • Page 32: Drawer Microwave Disassembly

    Drawer Microwave Access & Removal DRAWER MICROWAVE DISASSEMBLY Before removing Microwave Drawer, take measures to protect the Drawer vent by either removing the vent or by letting the louver over hang off fl at pro- tected surface. (See Figure 4-2) Open the Drawer to access the 4 mounting screws holding the unit on to the wall or cabinet opening.

  • Page 33: Rack Gear Removal

    Drawer Microwave Access & Removal Inner Drawer, Choke Cover and Rack Gear Removal: SHUT OFF BREAKER THAT SUPPLIES ELECTRICAL POWER BEFORE ATTEMPTING TO REMOVE INNER DRAWER ASSEMBLY. Open drawer to gain access to drawer support covers and gently pry covers out of choke cover to expose side rail mounting screws.

  • Page 34: Control Panel Removal

    Drawer Microwave Access & Removal Control Panel Removal: Drawer Microwave must be removed from its installation. See Drawer Microwave Disassembly (page 4-6) steps 1-3. DISCONNECT ELECTRICAL SUPPLY BEFORE ATTEMPTING THE FOLLOWING PROCEDURES. DANGEROUS HIGH VOLTAGE CAN BE PRESENT - CAREFULLY READ AND FOLLOW ALL WARNINGS AT THE BEGINNING OF THIS SECTION.

  • Page 35: Power Cord Replacement

    Capacitor (See WARNINGS). Cord connectors can be disconnected from noise fi lter unit. (Figure 4-11) Only replace power cord with exact replacement cord purchased from Wolf Appliance, Inc. NOTE: PLEASE SEE “AFTER SERVICING” (Page 4-6) WHEN REPAIR COMPLETE. Upper Cabinet Component Replacement:...

  • Page 36: Auto Drawer Gear Removal

    Drawer Microwave Access & Removal Auto Drawer Gear Removal: NOTE: This procedure requires a 14” long or greater phillips screwdriver. Screws DISCONNECT ELECTRICAL SUPPLY BEFORE ATTEMPTING THIS PROCEDURE. DANGEROUS HIGH VOLTAGE CAN BE PRESENT - CAREFULLY READ AND FOLLOW ALL WARNINGS AT THE BEGINNING OF THIS SECTION.
  • Page 37 Drawer Microwave Access & Removal Latch Hook Assembly, Stop Switch, Secondary Interlock Switch, and Monitor Switch Replacement: Drawer Microwave must be removed from its installation. See Drawer Microwave Disassembly (page 4-6). Screw DISCONNECT ELECTRICAL SUPPLY BEFORE ATTEMPTING THIS PROCEDURE. DANGEROUS HIGH VOLTAGE CAN BE PRESENT - CAREFULLY READ AND FOLLOW ALL WARNINGS AT THE BEGINNING OF THIS SECTION.

  • Page 38: Switch (Stop, Monitor, Secondary Interlock) Adjustment

    Drawer Microwave Access & Removal Stop Switch, Secondary Interlock Switch, and Monitor Switch Adjustment: Drawer Microwave must be removed from its installation. See Drawer Microwave Disassembly (page 4-6). DISCONNECT ELECTRICAL SUPPLY BEFORE ATTEMPTING THIS PROCEDURE. DANGEROUS HIGH VOLTAGE CAN BE PRESENT - CAREFULLY READ AND FOLLOW ALL WARNINGS AT THE BEGINNING OF THIS SECTION.

  • Page 39: Major Control Components

    Drawer Microwave Access & Removal Thermal Cut-out Magnetron Fan Motor HV Capacitor HV Transformer Power Supply Monitor Fuse Figure 4-17 Drawer Microwave Major Control Components DISCONNECT ELECTRICAL SUPPLY BEFORE ATTEMPTING THIS PROCEDURE. DANGEROUS HIGH VOLTAGE CAN BE PRESENT - CAREFULLY READ AND FOLLOW ALL WARNINGS AT THE BEGINNING OF THIS SECTION.
  • Page 40 Drawer Microwave Access & Removal NOTES 4-14...

  • Page 41: Parts List

    Drawer Microwave Parts & Exploded Views SECTION 5 PARTS LIST & EXPLODED VIEWS...
  • Page 42 Drawer Microwave Parts & Exploded Views MWD24 & MWD30 PARTS LIST Ref # Part # Description 813739 Transformer 813740 Magnetron 813741 Sensor Assy 813742 Monitor Switch Fuse Assy 813743 Power Supply 813744 Stir Cover Assy 813745 Side Rail 813746 HVC Assy...
  • Page 43 Drawer Microwave Parts & Exploded Views MWD24 & MWD30 Exploded View Actual wire harness may be different from illustration.
  • Page 44 Drawer Microwave Parts & Exploded Views NOTES...
  • Page 45 Drawer Microwave Troubleshooting SECTION 6 TROUBLESHOOTING...
  • Page 46 Drawer Microwave Troubleshooting 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 ELECTRICAL CIRCUIT WITH HANDS OR UN-INSULATED TOOLS WHILE THE POWER IS CONNECTED.

  • Page 47: Microwave Measurement Procedure

    Drawer Microwave Troubleshooting MICROWAVE MEASUREMENT PROCEDURE Requirements: Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a mi- crowave oven should not exceed 1mW/cm 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/cm any point 5cm or more from the external surface of the oven.

  • Page 48: Touch Control Panel Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 49: Key Unit Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Power Unit or Touch Control Transformer Fan motor, stirrer motor, oven lamp or electrical parts do not turn on or do not turn off. Digital display on the control unit does not show anything. When testing is completed, Disconnect the power supply cord, and then disassemble as per “Drawer Microwave Disas- sembly”...

  • Page 50: Defrost Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS Approx. 26 vdc Oven lamp / Common Approx. 25 vdc Power transformer Approx. 26 vdc Stirred motor Approx. 26 vdc Fan motor Approx. 26 vdc Switching regulator or drawer motor Disconnect the power supply cord, and then remove outer case.

  • Page 51: Ah Sensor Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. After that procedure, re-connect the power supply cord. Follow the troubleshooting guide given below for repair.
  • Page 52 Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER After approximately 16 seconds, microwave energy is produced. If ERROR is displayed or the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below. If the oven stops after 5 minutes and no ERROR code is dis- played, then the AH sensor is normal.

  • Page 53: Magnetron Assembly Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Carry out necessary repair. Reconnect all leads removed from components during testing and repairing. Re-install the covers. Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.

  • Page 54: Thermal Cut-Out Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Subtract the cold water temperature from the hot water temperature. The normal result should be 28° to 54°F (16° to 30°C) rise in temperature. If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output (low rise in water temperature) which would extend cooking time or high power out- put (high rise in water temperature) which would reduce cooking time.

  • Page 55: Blown Monitor Fuse Test

    Drawer Microwave Troubleshooting TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER To discharge high voltage capacitor, wait for 60 seconds. Before performing this test, make sure that the secondary interlock switch, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows.
  • Page 56 Drawer Microwave Troubleshooting NOTES 6-12...

  • Page 57: Section 7 - Wiring Diagrams

    Drawer Microwave Wiring Diagrams SECTION 7 WIRING DIAGRAMS...

  • Page 58: Harness Pinout Wiring

    Drawer Microwave Wiring Diagrams Drawer Microwave Harness Pinout Wiring Power Supply cord 120V 60Hz NOISE FILTER BOARD to Back Plate CN502 BLK or (SWITCHING POWER SUPPLY) CN502 CN501 MAGNETRON OVEN THERMAL THERMAL CUT-OUT CUT-OUT YLW or N.O. RED or YLW or N.C.
  • Page 59 Drawer Microwave Wiring Diagrams Drawer Microwave Power Unit Circuit CN-A PA154DR D1 -- D4 2.5A 1N4002L x4 CN-H FUSE AC 120V VRS1 60Hz 10G471K SW Reg . 502-3 H- 9 SW Reg. OUT +24V H-11 N.O. MICRO N.O. (O.L) <NOTE> : IF NOT SPECIFIED, 1SS270A ( ) : NOT INSERT PARTS : CHECK POINTS...

  • Page 60: Power Unit Printed Circuit Board

    Drawer Microwave Wiring Diagrams Drawer Microwave Power Unit Printed Circuit Board N.O. COM. N.O. COM. FUSE 2.5A...

  • Page 61: Control Unit Circuit

    Drawer Microwave Wiring Diagrams Drawer Microwave Control Unit Circuit...

  • Page 62: Control Unit Printed Circuit Board

    Drawer Microwave Wiring Diagrams Drawer Microwave Control Unit Printed Circuit Board...

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Mwd30

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