Viking DMOR206SS Service Manual
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Viking DMOR206SS Service Manual

Over the range microwave oven
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Table of Contents

See also: Cookbook , User Manual
OVER THE RANGE MICROWAVE OVEN
In the interest of user-safety, the oven should be restored to its original condition and only parts identical to those specified
should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current, contact with following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 4
WARNING TO SERVICE PERSONNEL ................................................................................................................. 6
FOREWORD AND WARNING ............................................................................................................................... 7
PRODUCT SPECIFICATIONS ............................................................................................................................... 8
GENERAL INFORMATION.................................................................................................................................... 8
OPERATION ......................................................................................................................................................... 11
TROUBLESHOOTING GUIDE ............................................................................................................................. 19
TEST PROCEDURE ............................................................................................................................................ 22
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE................................................................. 34
PICTORIAL DIAGRAM ......................................................................................................................................... 43
SERVICE MANUAL

TABLE OF CONTENTS

DMOR206SS
This document has been published
to be used for after sales service only.
The contents are subject to change
without notice
1
DMOR206SS
S89M317R206SS
MODEL
Page
.

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Summary of Contents for Viking DMOR206SS

  • Page 1: Table Of Contents

    DMOR206SS SERVICE MANUAL S89M317R206SS OVER THE RANGE MICROWAVE OVEN MODEL DMOR206SS In the interest of user-safety, the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock.

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

    Before servicing an operative unit, perform a microwave emission check as per the Microwave Measure- ment Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact Viking Service immediately @ 1-888-845-4641. If the unit operates with the door open, service person should (1) tell the user not to operate the oven and (2) contact VIKING, plus the Department Of Health, Canada and/or the Food and Drug Administration's Center for Devices and Radiological Health immediately.
  • Page 3 DMOR206SS Notes...

  • Page 4: Microwave Measurement Procedure

    DMOR206SS 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...
  • Page 5 DMOR206SS 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 6: Warning To Service Personnel

    DMOR206SS 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 7: Foreword And Warning

    DMOR206SS GENERAL INFORMATION FOREWORD OPERATION This Manual has been prepared to provide Viking Service Personnel with Operation and Service Information for the VIKING MICROWAVE OVEN. TROUBLESHOOTING GUIDE AND It is recommended that service personnel carefully study the entire TEST PROCEDURE text of this manual and the base model's manual so that they will be qualified to render satisfactory customer service.

  • Page 8: Product Specifications

    DMOR206SS SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection) - [UL Rating] 116 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection) - [CSA Rating] 60 Hertz Single phase, 3 wire grounded Power Output 850 watts (IEC-705 TEST PROCEDURE)

  • Page 9: Oven Diagram

    DMOR206SS Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more branch circuit, using a grounded receptacle.

  • Page 10: Control Panel

    DMOR206SS CONTROL PANEL MIC RO WAV E 1 Ba k e d pota toe s 2 Froze n ve g e ta ble s A dd- A 3 Fre sh ve g - soft Re he a t 4 Fre sh ve g - ha rd...

  • Page 11: Operation

    DMOR206SS OPERATION DESCRIPTION OF OPERATING SEQUENCE opened, the closing of the monitor switch contacts will form The following is a description of component functions dur- a short circuit through the monitor fuse, secondary switch ing oven operation. ,third door switch and primary interlock relay, causing the OFF CONDITION monitor fuse to blow.
  • Page 12 DMOR206SS 1. The coil of shut-off relays (RY1, RY4, RY5 and RY7) are to zero. energized, the oven lamp, turntable motor, cooling fan 2. The shut-off relays (RY1, RY4, RY5 and RY7) are motor and convection motor are turned on.
  • Page 13 DMOR206SS periment with each food category and inputted into the LSI. the desired program by touching one of the CONVEC BROIL, An example of how sensor works: CONVEC ROAST or CONVEC BAKE pad, and number pad. Enter the weight by touching the Number pads. When the START pad is touched, the following operations occur: 1.
  • Page 14 DMOR206SS the "START" pad or the unit may be reset by pressing 3. RE-CIRCULATION (INSIDE VENTING) the "CLEAR" pad. The air handing is same as VERTICAL VENTING except that the final air discharge is directed horizontally through IMPORTANT: the upper front of the oven into the kitchen. IN this case,...
  • Page 15 DMOR206SS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. MAGNETRON MONITOR SECONDARY TEMPERATURE INTERLOCK FUSE FUSE (20A) SWITCH CONTROL UNIT THIRD DOOR SWITCH MONITOR SWITCH BRN,PNK DOOR HOOD FAN SENSING DAMPER THERMAL SWITCH THERMISTOR SWITCH...
  • Page 16 DMOR206SS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CONVECTION PAD TOUCHED. 3. DESIRED TEMP. TOUCHED. 4. START PAD TOUCHED. MAGNETRON MONITOR TEMPERATURE SECONDARY INTERLOCK FUSE FUSE (20A) SWITCH CONTROL UNIT THIRD DOOR SWITCH MONITOR SWITCH BRN,PNK DOOR HOOD FAN...

  • Page 17: Description And Function Of Components

    DMOR206SS DESCRIPTION AND FUNCTION OF COMPONENTS operate inversely.) DOOR OPEN MECHANISM 3. If the door is opened, and the secondary interlock relay, The door is opened by pushing the open button on the primary switch and secondary switch contacts fail to control panel, refer to the Figure D-1.
  • Page 18 DMOR206SS STIRRER MOTOR Damper Operation 1. When power supply cord is plugged in: The stirrer motor drives the stirrer fan to stir the microwave 1-1. When power supply cord is plugged in, a signal is radiation from the waveguide. sensed in the control unit, and operates shut-off relay (RY6).

  • Page 19: Troubleshooting Guide

    DMOR206SS 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 20 DMOR206SS TROUBLESHOOTING GUIDE 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. These tests are given a procedure letter which will be found in the "Test Procedure"...
  • Page 21 DMOR206SS IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary inter- lock relay, door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/KIT as an assembly.

  • Page 22: Test Procedure

    DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER POWER TRANSFORMER 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. 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 23 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY 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 24 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER PRIMARY INTERLOCK RELAY (RY2) 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 two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the state of the relay contacts using a ohmmeter.
  • Page 25 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN MONITOR FUSE 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. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 26 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HOOD FAN MOTOR 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. If the motor does not turn, touch the Vent button once (set hood fan motor power "HIGH") and check voltage between pins "1"...
  • Page 27 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CHECKING TEMPERATURE IN THE CONVECTION MODE 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. It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type temperature tester must be used.
  • Page 28 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST 2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure R) to determine if control unit is faulty.
  • Page 29 DMOR206SS 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.
  • Page 30 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse.
  • Page 31 DMOR206SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Water load cooking test Make sure the oven has been plugged in at least five minutes before checking sensor cook operation. The cabinet should be installed and screws tightened. (1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
  • Page 32 DMOR206SS 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.
  • Page 33 DMOR206SS ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor Then the detector circuit starts to function and the LSI The absolute humidity sensor includes two thermistors observes the initial voltage available at its AN6 terminal. as shown in the illustration. One thermistor is housed in...

  • Page 34: Component Replacement And Adjustment Procedure

    DMOR206SS COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE 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 35 DMOR206SS REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven) 1. Disconnect the power supply cord, and uncoil the power 6. Lower the front of the oven and pull the power cord out supply cord. of the wall cabinet.
  • Page 36 DMOR206SS 10. Now, the hood fan motor is free. sensor assembly. Remove the hood exhaust duct from the oven cavity 18. Remove two (2) screws holding the AH sensor assembly by lifting it up to the exhaust duct. 12. Screw the oven lamp off from the lamp socket.
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  • Page 43: Pictorial Diagram

    DMOR206SS...
  • Page 44 DMOR206SS NOTES...
  • Page 45 DMOR206SS COPYRIGHT © 2009 BY VIKING RANGE CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission...

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