Wolf SUB-ZERO MC24 Service Manual
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Wolf SUB-ZERO MC24 Service Manual

Convection microwave
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General Information
Controls & Operation
Troubleshooting Guide
Component Access & Removal
Wiring Diagrams
MC24 Convection Microwave
Service Manual
subzero.com
800.222.7820
15
25
32
2
9

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Summary of Contents for Wolf SUB-ZERO MC24

  • Page 1 subzero.com 800.222.7820 MC24 Convection Microwave Service Manual General Information Controls & Operation Troubleshooting Guide Component Access & Removal Wiring Diagrams...

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    2) contact WOLF and Food and Drug Administration's Center for Devices and Radiological Health immediately. Service personnel should inform WOLF of any certified unit found with emissions in excess of 4mW/cm . The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance.

  • Page 3: Warning To Service Personnel

    MC24 WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

  • Page 4: Microwave Measurement Procedure (Canada)

    MC24 MICROWAVE MEASUREMENT PROCEDURE (CANADA) After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard for microwave ovens as undermentioned.

  • Page 5: Microwave Measurement Procedure (Usa)

    MC24 MICROWAVE MEASUREMENT PROCEDURE (USA) A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave 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 at any point 5cm or more from the external surface of the oven.
  • Page 6 MICROWAVE OVEN MC24 FOREWORD This Manual has been prepared to provide Wolf Service Personnel with Operation and Service Information for the Wolf Microwave Oven, MC24. It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.

  • Page 7: Specification

    F for 4 hours Reheat, Add Minute, Popcorn, Auto Defrost, Convec, Micro Roast, Micro Bake, Number and temperature selections, Timer, Clock, Stop/Clear, Power Level, Start / Quick On, Settings, Keep warm, Wolf Gourmet Oven Cavity Light Safety Standard UL Listed...

  • Page 8: Oven Diagram

    MC24 Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, Grounded 3-Pronged Plug Receptacle Box 15 or more amp. fused electrical supply. It is recommended that a sepa- rate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.

  • Page 9: Operation

    MC24 OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions dur- 6. When the door is opened during a cook cycle, third door switch, monitor switch, door sensing switch, the ing oven operation. secondary interlock relay and the primary interlock switch OFF CONDITION are activated with the following results.

  • Page 10: Convection Cooking Condition

    MC24 CONVECTION COOKING CONDITION Touch the MICRO ROAST or MICRO BAKE then touch START to preheat (Touch same pad twice to change default PREHEATING CONDITION convection temperature.) Oven reaches preheating condi- Program desired convection temperature by touching the tions.. Open the door and place the food to be cooked in CONVECTION pad and the Temperature pad.

  • Page 11: Sensor Cooking Condition

    MC24 SENSOR COOKING CONDITION AUTO DEFROST COOKING Using the SENSOR COOK function, the foods are cooked The AUTO DEFROST key is a special function key to de- without figuring time, power level or quantity. When the oven frost meats and poultry faster and better. AUTO DEFROST senses enough steam from the food, it relays the informa- automatically defrosts roast beef, etc..

  • Page 12: Schematic Diagram

    MC24 SCHEMATIC DIAGRAM SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. CONV. MAGNETRON OVEN THERMAL THERMAL THERMAL NOISE FILTER CUT-OUT CUT-OUT CUT-OUT COM. (RY1) N.O. (RY1) POWER TRANSFORMER COM. (RY3) COM. SECONDARY (RY2) INTERLOCK N.O. CONTROL UNIT RERAY (RY2)
  • Page 13 MC24 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. MIX COOKING PAD TOUCHED. 3. COOKING TIME PROGRAMMED. 4. “START” PAD TOUCHED. 5. RY2 AND RY3 WILL ALTERNATELY CLOSE. DURING COOK CYCLE. CONV. MAGNETRON OVEN THERMAL THERMAL THERMAL NOISE FILTER CUT-OUT CUT-OUT CUT-OUT...
  • Page 14 MC24 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR SENSING AND PRIMARY INTERLOCK THIRD DOOR SWITCH SWITCHES The switch is activated by the latch heads, while the door is closed. When the door is opened, the switch interrupt the The door sensing switch in the secondary interlock system circuit to the power transformer.

  • Page 15: Troubleshooting Guide

    MC24 oven cavity by means of the convection fan which is driven 1-3. When the damper is moved to the open position by by the convection motor. It then enters the inside of the the damper cam the damper switch is closed (ON oven through the vent holes provided on the left side of the position).
  • Page 16 MC24 (SENSOR CONDITION OFF CONDITION COOKING CONDITION (MICROWAVE) (CONVECTION) COOKING) PROBLEM POSSIBLE CAUSE DEFECTIVE PARTS MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR PRIMARY INTERLOCK SWITCH SECONDARY INTERLOCK SYSTEM MONITOR SWITCH MONITOR FUSE OVEN THERMAL CUT-OUT CONVECTION CUT-OUT CONVECTION HEATER THERMISTOR DAMPER MOTOR DAMPER SWITCH...

  • Page 17: Test Procedures

    MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.

  • Page 18: Monitor Switch

    MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter. Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate conti- nuity for a short time and should indicate approximately 10 MΩ...
  • Page 19 MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON THERMAL CUT-OUT (on the waveguide) A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the ο ο temperature of the thermal cut-out reaches approximately 257 F (125 An open thermal cut-out indicates overheating of the magnetron.
  • Page 20 MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CHECKING TEMPERATURE IN THE CONVECTION MODE It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type temperature tester must be used. A low priced bi-metal type thermometer is not reliable or accurate. The temperature should be checked with outer case cabinet installed, approx.

  • Page 21: Noise Filter Test

    MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER TEST NOISE FILTER Disconnect the oven from power supply. FUSE 20A Disconnect the lead wires from the terminal the noise filter. Using NOISE SUPPRESSION COIL an ohmmeter, check between the terminals as described in the following table.

  • Page 22: Component Test

    MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER AH SENSOR TEST Checking the initial sensor cooking condition (1) The oven should be plugged in at least two minutes before sensor cooking. ο ο (2) Room temperature should not exceed 95 F (35 (3) The unit should not be installed in any area where heat and steam are generated.
  • Page 23 MC24 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CHECKING CONTROL UNIT (1) Disconnect oven from power supply and remove outer case. (2) Discharge the high voltage capacitor. (3) Disconnect the wire leads from the cook relay. (4) Disconnect the sensor connector that is mounted to lower portion of control panel. (5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.

  • Page 24: Absolute Humidity Sensor Circuit

    MC24 ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor observes the initial voltage available at its AN6 terminal. The absolute humidity sensor includes two thermistors With this voltage given, the switches SW1 to SW5 in as shown in the illustration. One thermistor is housed in the LSI are turned on in such a way as to change the the closed vessel filled with dry air while another in the resistance values in parallel with R50-1.

  • Page 25: Component Replacement And Adjustment Procedure

    MC24 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE. DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING AFTER REMOVING OUTER CASE. OUTER CASE REMOVAL WARNING FOR WIRING To prevent an electric shock, take the following manners. 3) Sharp edge: 1.

  • Page 26: Positive Lock ® Connector (No-Case Type) Removal

    MC24 HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL 1. Disconnect oven from power supply and remove outer case. 2. Discharge the high voltage capacitor. FIER ASSEMBLY, THE GROUND SIDE TER- 3. Remove one (1) screw holding the rectifier assembly to MINAL MUST BE SECURED FIRMLY WITH A the capacitor holder.

  • Page 27: Thermistor Removal

    MC24 HEATER UNIT ASSEMBLY REMOVAL (HEATING ELEMENT/CONVECTION FAN/CONVECTION MOTOR/THERMISTOR) THERMISTOR REMOVAL HEATING ELEMENT REMOVAL 1. Disconnect oven from power supply and remove outer 1. Remove two (2) screws holding heating element to heater case cabinet. duct. 2. Discharge the high voltage capacitor. 2.

  • Page 28: Installation

    MC24 16. Remove the two (2) screws and nuts holding the fan because the bracket may be disfigured. motor to the fan duct. * Make sure that the fan blade rotates smooth after 17. Now, the fan motor is free. installation.

  • Page 29: Door Replacement And Adjustment

    MC24 THIRD DOOR SWITCH, DOOR SENSING SWITCH, PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 8. Switch is now free. At this time switch lever will be free, do not lose it. 1. Disconnect oven from power supply and remove outer Re-install case.

  • Page 30: Door Adjustment

    MC24 7. Make sure the door is parallel with oven face lines (left cycle. This function does not require that door be and upper side lines) and door latch heads pass through airtight, moisture (condensation)-tight or light-tight. latch holes correctly. Therefore, occasional appearance of moisture, light 8.

  • Page 31: Microwave Measurement Procedure

    MC24 MICROWAVE MEASUREMENT PROCEDURE After adjustment of the door, interlock and monitor switches Leakage test: are completed individual or collectively, interlock switch test Leakage Test with Enclosure Installed. and microwave leakage test must be performed with survey instrument and test results must be confirmed to meet the 1.
  • Page 32 MC24...

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