Wolf MWD30-2 Troubleshooting Manual
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Wolf MWD30-2 Troubleshooting Manual

Drawer microwave
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Troubleshooting Guide
TROUBLESHOOTING AND TECHNICAL DATA
This section of the manual Component Test Procedures.
NOTE:
Before continuing, please take note of the
• 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.
• MICROWAVE OVENS CONTAIN CIRCUITRY CAPABLE OF PRODUCING VERY HIGH VOLTAGE AND CUR-
RENT. CONTACT WITH THE FOLLOWING COMPONENTS MAY RESULT IN SERIOUS PERSONAL INJURY OR
DEATH:
• TRANSFORMER • RECTIFIER • HIGH VOLTAGE HARNESS
• MAGNETRON
NOTE:
THE CAPACITOR REMAINS CHARGED APPROXIMATELY 60 SECONDS AFTER THE OVEN IS
SWITCHED OFF. WAIT FOR 60 SECONDS, THEN SHORT THE CAPACITOR TO THE CHASSIS.
• BEFORE SERVICING THE MICROWAVE OVEN, THE CAPACITOR MUST BE DISCHARGED BY SHORTING
THE CONNECTING LEAD OF THE RECTIFIER AGAINST THE CHASSIS WITH AN INSULATED SCREWDRIV-
ER. FAILURE TO FOLLOW THIS STEP COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
• DO NOT OPERATE OR ALLOW THE OVEN TO BE OPERATED WITH THE DOOR OPEN.
Be careful when handling sheet metal parts - Edges may be
NOTE:
When troubleshooting, it may be necessary in some cases to supply power to the unit with the outer cabinet
case removed (See CAUTION above).
In this event:
1. Disconnect the power supply cord, and then remove outer cabinet case.
2. Open the door and block it open.
3. Discharge high voltage capacitor (See WARNING above).
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. Only after performing the five steps listed above should the power supply cord be reconnected.
When the testing is completed:
1. Disconnect the power supply cord, then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer cabinet.
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
NOTES:
• After performing any service to the Drawer Microwave, test to verify that there is no leakage of microwave ener-
gy (See next page).
• Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave
source, and make repairs as necessary:
• Interlock operation
• Proper drawer closing
• Seal and sealing surfaces (arcing, wear, and other damage)
• Evidence of dropping or abuse
• Before turning on microwave power for any service test or inspection within the microwave generating compart-
ments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and con-
nections.
#813632 - Revision B - December, 2009
Drawer Microwave
• CAPACITOR
(Models MWD24-2 / MWD30-2)
WARNINGS
and
CAUTIONS
sharp.
5-2
below.

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Summary of Contents for Wolf MWD30-2

  • Page 1 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 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 2: 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 3: Test Procedures

    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 4: 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 5: 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 6 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 7: Procedures To Be Taken When The Fuse On The Printed Wiring Board (Pwb) Is Open

    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 8: 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 9: Testing Method For Ah Sensor And/Or Control Unit

    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 10: 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 11: 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 12: 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 13: 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 14: 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.

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Mwd24-2

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