Sub-Zero Wolf MS24 Service Manual
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Sub-Zero Wolf MS24 Service Manual

Sub-Zero Wolf MS24 Service Manual

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General Information
Controls & Operation
Troubleshooting Guide
Component Access & Removal
Wiring Diagrams
MS24 Standard Microwave
Service Manual
subzero.com
800.222.7820
12
25
31
2
8

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Summary of Contents for Sub-Zero Wolf MS24

  • Page 1 subzero.com 800.222.7820 MS24 Standard 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

    MS24 PRECAUTIONS TO BE OBSERvED BEFORE AND DURING SERvICING TO AvOID POSSIBLE EXPOSURE TO EXCESSIvE mICROWAvE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.

  • Page 3: Warning To Service Personnel

    MS24 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

    MS24 mICROWAvE mEASUREmENT PROCEDURE 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 5: Microwave Oven

    MS24 SERVICE MANUAL MICROWAVE OVEN MS24 FOREWORD This Manual has been prepared to provide WOLF Service Personnel with Operation and Service Information for the WOLF oven. 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 6: Specification

    MS24 SPECIFICATION ITEm DESCRIPTION Power Requirements 120 Volts / 13.8 Amperes/1650Watts 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 24" Height 13-3/8" Depth 19-1/8" Cooking Cavity Dimensions Width 17-3/8"...

  • Page 7: Oven Diagram

    MS24 Grounded CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR Receptacle Box REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG. 3-Pronged Plug Grounding Pin 3-Pronged Receptacle OvEN DIAGRAm Door seals and Ventilation Menu label Oven light sealing surfaces openings (rear) Power supply cord Rating plate Interactive display...

  • Page 8: Operation

    MS24 OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions dur- 7. The monitor switch electrically monitors the operation ing oven operation. of the primary interlock switch and secondary interlock relay and is mechanically associated with the door so OFF CONDITION that it will function in the following sequence.

  • Page 9: Sensor Cooking Condition

    MS24 2. The coil of shut-off relay (RY-1) is energized, the turntable motor are turned on, but the power transformer is not SENSOR COOKING CONDITION turned on. 3. After about 16 seconds, the cook relay (RY-2) is Using the SENSOR function, food is cooked without figur- energized.
  • Page 10 MS24 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY N.O. COM. DOOR SENSING POWER SWITCH TRANSFORMER HUMIDITY (RY2) SENSOR SECONDARY INTERLOCK RELAY CONTROL UNIT (RY1) COM. N.O. 120VAC HIGH 60Hz VOLTAGE OVEN CAPACITOR LAMP xx µF RELAY MONITOR N.C.

  • Page 11: Description And Function Of Components

    DESCRIPTION AND FUNCTION OF COmPONENTS MS24 DOOR OPEN mECHANISm 3. If the door is opened, and the secondary interlock relay (RY2) and primary interlock switch contacts fail to open, The door is opened by pushing the open button on the con- the monitor fuse blows simultaneously with closing of the trol panel, refer to the Figure D-1.

  • Page 12: Troubleshooting Guide

    MS24 TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed.

  • Page 13: Test Procedures

    MS24 CK = Check / RE = Replace TEST PROCEDURE RE RE A B C D E E F F G RE RE CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall receptacle. Monitor fuse blows when power cord is plugged into wall receptacle.
  • Page 14 MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER 4. 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. 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
  • Page 15 MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER HIGH vOLTAGE RECTIFIER 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. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.

  • Page 16: Primary Interlock Switch Test

    MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER 8. Run the oven and check all functions. CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE. PRImARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2.

  • Page 17: Monitor Switch Test

    MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER mONITOR SWITCH 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. Before performing this test, make sure that the primary interlock switch and the secondary interlock relay are operating properly, according to the above Switch Test Procedure.
  • Page 18 MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up;...
  • Page 19 MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER 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. 5.

  • Page 20: Ah Sensor Test

    MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER AH SENSOR TEST Checking the initial sensor cooking condition Warning: The oven should be fully assembled before following procedure. 1) The oven should be plugged in at least two minutes before sensor cooking. 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 21 MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER TESTING mETHOD FOR AH SENSOR AND /OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sen- sor. (1) Disconnect the power supply cord, and then remove outer case. (2) Open the door and block it open.

  • Page 22: Checking Control Unit

    MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER CHECKING CONTROL UNIT (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 sensor connector that is mounted to control panel. (5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
  • Page 23 MS24 ABSOLUTE HUmIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor With this voltage given, the switches SW1 to SW5 in The absolute humidity sensor includes two thermistors the LSI are turned on in such a way as to change the as shown in the illustration.

  • Page 24: Measuring Point

    MS24 TEST PROCEDURES PROCEDURE COmPONENT TEST LETTER NOISE FILTER 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. 5.

  • Page 25: Component Replacement And Adjustment Procedure

    MS24 COmPONENT REPLACEmENT AND ADJUSTmENT PROCEDURE WARNING AGAINST HIGH vOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

  • Page 26: Power Transformer Removal

    MS24 CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Special screw Torx screws must be reinstalled in the same locations.
  • Page 27 MS24 OvEN LAmP AND LAmP SOCKET REmOvAL 1. Disconnect the power supply cord and remove outer case. 2. Open the door and block it open. Terminal Oven lamp 3. Discharge high voltage capacitor. socket 4. Pull the wire leads from the oven lamp socket. 5.

  • Page 28: Cooling Fan Motor Removal

    MS24 COOLING FAN mOTOR REmOvAL REmOvAL CAUTION: 1. Disconnect the power supply cord and then remove outer * Do not reuse the removed fan blade because the case. hole (for shaft) may be larger than normal. 2. Open the door and block it open. 3.

  • Page 29: Door Sensing Switch/Secondary Interlock Switch And Monitor Switch Adjustment

    MS24 3. Secure latch hook (with two (2) mounting screws) to and check continuity of the monitor circuit. Refer to chapter oven flange. "Test Procedure" and Adjustment procedure. 4. Make sure that the monitor switch is operating properly DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND mONITOR SWITCH ADJUSTmENT 1.

  • Page 30: Sealer Film

    MS24 SEALER FILm 6. Re-install choke cover to door panel by pushing. Installation Note: After any service to the door; 1. Put the adhesive tape on the backing film of the sealer (A) make sure that door sensing switch and secondary film as shown in Fig.
  • Page 31 MS24...

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