Viking DMOR205SS Service Manual
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Viking DMOR205SS Service Manual

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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 .....................................................................................................2
WARNING TO SERVICE PERSONNEL ................................................................................................................4
FOREWORD AND WARNING ................................................................................................................................5
PRODUCT SPECIFICATIONS ...............................................................................................................................6
GENERAL INFORMATION ...................................................................................................................................6
OPERATION .........................................................................................................................................................9
TROUBLESHOOTING GUIDE ............................................................................................................................. 17
TEST PROCEDURE ............................................................................................................................................ 20
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................. 31
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 37
PICTORIAL DIAGRAM ........................................................................................................................................ 46
LSI UNIT CIRCUIT ............................................................................................................................................... 47
PRINTED WIRING BOARD ................................................................................................................................. 48
PARTS LIST ........................................................................................................................................................ 49
PACKING AND ACCESSORIES ......................................................................................................................... 54
111 Front St., Greenwood, MS 38930
SERVICE MANUAL
DMOR205SS
VMOR205SS

TABLE OF CONTENTS

Range Corporation
Tel: (888) 845-4641
OVER THE RANGE
MICROWAVE OVEN
DMOR205SS
MODELS
VMOR205SS
This document has been published
to be used for after sales service only.
The contents are subject to change
without notice
VMOR205SS
DMOR205SS
S95M255VMO205
Page
.

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  • Page 1: Table Of Contents

    VMOR205SS DMOR205SS SERVICE MANUAL S95M255VMO205 OVER THE RANGE DMOR205SS MICROWAVE OVEN DMOR205SS MODELS VMOR205SS VMOR205SS 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 VMOR205SS DMOR205SS Notes...

  • Page 4: Microwave Measurement Procedure

    VMOR205SS DMOR205SS 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...
  • Page 5 VMOR205SS DMOR205SS 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

    VMOR205SS DMOR205SS 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 Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 7: Foreword And Warning

    GENERAL INFORMATION DMOR205SS FOREWORD OPERATION This Manual has been prepared to provide Viking Service Personnel with Operation and Service Information for the VIKING MICROWAVE OVENS, VMOR205SS and DMOR205SS. TROUBLESHOOTING GUIDE AND It is recommended that service personnel carefully study the entire text...

  • Page 8: Product Specifications

    VMOR205SS DMOR205SS 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...
  • Page 9 VMOR205SS DMOR205SS 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 Tim e r C loc k He lp Le ve l Wa rm Fa n Turnta ble Stop / Sta rt / Lig ht Hi/ Lo O n/ O ff C le a r Touc h O n DMOR205SS Key Sheet...

  • Page 11: Operation

    VMOR205SS DMOR205SS OPERATION DESCRIPTION OF OPERATING SEQUENCE primary interlock relay, door sensing switch, The following is a description of component functions during secondary and third door switch open their contacts, oven operation. and then the monitor switch contacts close. (2) When the door is closed from the open position, the...
  • Page 12 VMOR205SS DMOR205SS zero. 1. The coil of shut-off relays (RY1, RY4, RY5 and RY7) are 2. The shut-off relays (RY1, RY4, RY5 and RY7) are energized, energized, the oven lamp, turntable motor, cooling fan turning on the oven lamp, turntable motor, cooling fan motor and convection motor are turned on.
  • Page 13 VMOR205SS DMOR205SS The time of supplementary cooking is determined by experi- will automatically compute the oven temperature, microwave ment with each food category and inputted into the LSI. power and cooking time for broiling, roasting and baking. Set An example of how sensor works: the desired program by touching one of the CONVEC BROIL, CONVEC ROAST or CONVEC BAKE pad, and number pad.
  • Page 14 VMOR205SS DMOR205SS also stops counting down and closes the damper door so 3. RE-CIRCULATION (INSIDE VENTING) that no fresh air will enter the oven cavity. The air handing is same as VERTICAL VENTING except that the final air discharge is directed horizontally 3.
  • Page 15 VMOR205SS DMOR205SS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. MAGNETRON SECONDARY MONITOR TEMPERATURE INTERLOCK FUSE FUSE (20A) SWITCH CONTROL UNIT THIRD DOOR SWITCH MONITOR SWITCH BRN,PNK DOOR HOOD FAN SENSING DAMPER THERMAL SWITCH THERMISTOR...
  • Page 16 VMOR205SS DMOR205SS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CONVECTION PAD TOUCHED. 3. DESIRED TEMP. TOUCHED. 4. START PAD TOUCHED. MAGNETRON SECONDARY MONITOR TEMPERATURE INTERLOCK FUSE FUSE (20A) SWITCH CONTROL UNIT THIRD DOOR SWITCH MONITOR SWITCH BRN,PNK DOOR...
  • Page 17 VMOR205SS DMOR205SS DESCRIPTION AND FUNCTION OF COMPONENTS opening the door, each of these switches 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 control primary switch and secondary switch contacts fail to panel, refer to the Figure D-1.
  • Page 18 VMOR205SS DMOR205SS Damper Operation 1. When power supply cord is plugged in: STIRRER MOTOR 1-1. When power supply cord is plugged in, a signal is The stirrer motor drives the stirrer fan to stir the microwave sensed in the control unit, and operates shut-off relay radiation from the waveguide.

  • Page 19: Troubleshooting Guide

    VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary interlock 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

    VMOR205SS DMOR205SS 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. 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 VMOR205SS DMOR205SS 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 24 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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 VMOR205SS DMOR205SS 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: Touch Control Panel Assembly

    VMOR205SS DMOR205SS TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units 3) Synchronizing Signal Circuit as shown in the touch control panel circuit. The power source synchronizing signal is available in...
  • Page 34 VMOR205SS DMOR205SS DESCRIPTION OF LSI LSI(IZA719DR) The I/O signals of the LSI(IZA719DR) are detailed in the following table. Pin No. Signal Description Connected to GND. Anode (segment) of Fluorescent Display illumination voltage: -31V. Vp voltage of power source circuit input.
  • Page 35 VMOR205SS DMOR205SS Pin No. Signal Description Convection motor driving signal. During To turn on and off shut-off relay(RY7). "L" level during cooking (Convection) CONVECTION; "H" level otherwise. Hood lamp driving signal. H : GND To turn on and off relay(RY8). "L" level: During Hood lamp ON.
  • Page 36 VMOR205SS DMOR205SS Pin No. Signal Description XOUT Internal clock oscillation frequency control output. Output to control oscillation input of XIN. Power source voltage:-5V. VC voltage of power source circuit input. Signal coming from touch key. When any one of G12 line keys on key matrix is touched, a corresponding signal will be input into P27.
  • Page 37 VMOR205SS DMOR205SS Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal while one of G2 line keys on key matrix is touched. Segment data signal.
  • Page 38 VMOR205SS DMOR205SS SERVICING (sensor-related ones included) of the touch control panel 1. Precautions for Handling Electronic Components while keeping it connected to the oven. This unit uses CMOS LSI in the integral part of the circuits. B. On some models, the power supply cord between the...

  • Page 39: Component Replacement And Adjustment Procedure

    VMOR205SS DMOR205SS 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 40 VMOR205SS DMOR205SS REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven) 1. Disconnect the power supply cord, and uncoil the power plate. supply cord. 6. Lower the front of the oven and pull the power cord out of 2.
  • Page 41 VMOR205SS DMOR205SS 10.Now, the hood fan motor is free. 18.Remove two (2) screws holding the AH sensor assembly 11.Remove the hood exhaust duct from the oven cavity by to the exhaust duct. lifting it up 19.Now, the AH sensor assembly and the exhaust duct are 12.Screw the oven lamp off from the lamp socket.
  • Page 42 VMOR205SS DMOR205SS COOLING FAN MOTOR REMOVAL 10.Release the fan duct assembly from the oven cavity. 1. Disconnect the power supply cord, remove the oven from 11.Remove the fan blade from the fan motor shaft according wall and remove outer case, remove the unit mounting the following procedure.
  • Page 43 VMOR205SS DMOR205SS TURNTABLE MOTOR AND COUPLING REMOVAL 1. Disconnect the power supply cord. 5. Disconnect the wire leads from the turntable motor. 2. Open the door and block it open. 6. Remove two (2) screws holding turntable motor to the 3.
  • Page 44 VMOR205SS DMOR205SS 15.Remove the one (1) screw holding the key fixing plate to 4. Insert the bottom edge of the display board under the tab the control panel. of control panel as shown in step 4. 16.Release the four (4) tabs holding the key fixing plate to the 5.
  • Page 45 VMOR205SS DMOR205SS CONVECTION DUCT ASSEMBLY REMOVAL 1. Disconnect power supply cord, remove the oven from wall NOTE: After installed the heating element completely, and remove outer case. (Refer to procedure of "Removal bent top of the heating element holder to inside of Oven from Wall"...
  • Page 46 VMOR205SS DMOR205SS 4. Make sure that the monitor switch is operating properly diagram. and check continuity of the monitor circuit. Refer to 3. Secure the latch hook (with two (2) mounting screws) to chapter "Test Procedure" and "Adjustment procedure". oven cavity front flange.
  • Page 47 VMOR205SS DMOR205SS microwave energy from oven cavity during cook 6. Re-install the door stopper to the door assembly. cycle. This function does not require that door be 7. Re-install the sash left to the oven cavity front face plate. 8. Re-install the hood exhaust louver to the oven cavity front air-tight, moisture (condensation)-tight or light- face plate.

  • Page 48: Pictorial Diagram

    VMOR205SS DMOR205SS...

  • Page 49: Lsi Unit Circuit

    VMOR205SS DMOR205SS...

  • Page 50: Printed Wiring Board

    VMOR205SS DMOR205SS TAPE R100 ,BFB (D65) (R65) (C65) CN - E (JA) OVEN LAMP RY10 VRS1 CN - B CN - A CONV DAMP FAN.M T T M AC (N) MOTOR CAPACITOR...

  • Page 51: Parts List

    CONTROL PANEL PARTS 3- 1 DPWBFB108MRU0 Control unit 3- 2 FPNLCB508MRK0 Control panel sub. assembly (VMOR205SS) 3- 2 FPNLCB509MRK0 Control panel sub. assembly (DMOR205SS) 3- 3 MSPRCA045WRE0 Open button spring 3- 4 FDECAB081MRK0 Open button assy (VMOR205SS) 3- 4 FDECAB082MRK0...
  • Page 52 Heat protect rear DOOR PARTS 5- 1 DDORFB109MRK0 Door panel assembly 5- 2 FCOV-B302MRK0 Door frame (VMOR205SS) 5- 2 FCOV-B303MRK0 Door frame (DMOR205SS) 5- 3 GCOVHB031MRF0 Choke cover 5- 4 LSTPPB025MRF0 Latch head 5- 5 MSPRTA046WRE0 Latch spring 5- 6...
  • Page 53 VMOR205SS DMOR205SS REF. NO. PART NO. DESCRIPTION Q'TY MISCELLANEOUS 6- 1 CFZK-B131MRK0 Installation material assembly 6-1-1 LBSHC0040MRE0 Grommet 6-1-2 LX-BZ0195WRE0 Toggle screw 6-1-3 XWHSD50-16300 Washer 6-1-4 XBRSD50P60000 Screw : 5mm x 60mm 6-1-5 XOTSE40P12000 Screw : 4mm x 12mm 6-1-6...
  • Page 54 VMOR205SS DMOR205SS OVEN AND CABINET PARTS 4-52 4-52 4-50 1-17 7-25 4-50 4-51 7-24 4-16 7-24 2-10 4-39 4-46 7-11 4-36 4-25 7-24 7-24 4-37 1-21 4-24 7-11 4-40 7-17 1-13 4-38 7-11 7-20 4-44 4-20 4-54 7-21 1-16 7-14 7-15...
  • Page 55 VMOR205SS DMOR205SS VMOR205SS 4-35 DMOR205SS 4-35 MISCELLANEOUS 6-1-1 6-1-4 6-1-5 6-1-2 6-1-6 6-10 6-1-3...

  • Page 56: Packing And Accessories

    ASSEMBLY TRAY HOLDER 4-1 DAMPER ASSEMBLY DAMPER HOLDER COPYRIGHT © 2005 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, me-...

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