Viking VMOS201SS Service Manual
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Viking VMOS201SS Service Manual

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Above model is example only
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 the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit that includes
High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier and Heat sink etc., and Magnetron, High
Voltage Harness etc..)
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY .......................................................... 2
BEFORE SERVICING ............................................................................................................................................ 2
WARNING TO SERVICE PERSONNEL ................................................................................................................. 4
MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 5
FOREWORD AND WARNING ............................................................................................................................... 7
PRODUCT SPECIFICATIONS ............................................................................................................................... 8
GENERAL INFORMATION.................................................................................................................................... 8
OPERATION ......................................................................................................................................................... 10
TROUBLESHOOTING GUIDE ............................................................................................................................. 14
TEST PROCEDURE ............................................................................................................................................ 15
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE................................................................. 26
PICTORIAL DIAGRAM ......................................................................................................................................... 32
PARTS LIST ........................................................................................................................................................ 33
PACKING AND ACCESSORIES .......................................................................................................................... 37
Range Corporation
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
SERVICE MANUAL

TABLE OF CONTENTS

MICROWAVE OVEN MODELS
VMOS201SS
VMOS201BK
VMOS201WH
VMOS201BT
VMOS201SG
VMOS201GG
VMOS201BU
VMOS201GM
VMOS201SA
VMOS201CH
VMOS201PL
VMOS201AR
This document has been published to be used for after
sales service only.
1
S11326MOS201
VMOS201RR
VMOS201PM
VMOS201IB
VMOS201SE
VMOS201LE
VMOS201MJ
VMOS201VB
VMOS201CB
VMOS201MS
VMOS201TP
VMOS201CW
VMOS201OG
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Summary of Contents for Viking VMOS201SS

  • Page 1: Table Of Contents

    SERVICE MANUAL S11326MOS201 MICROWAVE OVEN MODELS VMOS201SS VMOS201RR VMOS201BK VMOS201PM VMOS201WH VMOS201IB VMOS201BT VMOS201SE VMOS201SG VMOS201LE VMOS201GG VMOS201MJ VMOS201BU VMOS201VB VMOS201GM VMOS201CB VMOS201SA VMOS201MS VMOS201CH VMOS201TP VMOS201PL VMOS201CW Above model is example only VMOS201AR VMOS201OG 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.

  • 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 Notes...

  • Page 4: Warning To Service Personnel

    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 5: Microwave Measurement Procedure

    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 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 7: Foreword And Warning

    VMOS201SE VMOS201OG FOREWORD OPERATION This Manual has been prepared to provide Viking Service Personnel with Operation and Service Information for the Viking Microwave Ovens. TROUBLESHOOTING GUIDE AND TEST PROCEDURE 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 8: Product Specifications

    SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.0 Amperes/1500Watts 60 Hertz Single phase, 3 wire grounded Power Output 1100 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" 2.0 Cubic Feet Height 10-1/2"...
  • Page 9 When installing this appliance, observe all applicable codes and ordinances. A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord. Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to con- tact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized.

  • Page 10: Operation

    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 switch and primary and is mechanically associated with the door so that it will function in the OFF CONDITION following sequence.
  • Page 11 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 12 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY S E C ONDAR Y P R IMAR Y S WIT C H S WIT C H N.O. C OM. N.O. C OM. T T M C AP AC IT OR 1.0µF AC 2300V DOOR S E NS ING...
  • Page 13 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM 3. If the door is opened, primary switch and contacts fail The door is opened by pushing the open button on the con- to open, the monitor fuse blows simultaneously with trol panel, refer to the Figure D-1. When the open button is closing of the monitor switch contacts.

  • Page 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is con- nected. 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 15: Test Procedure

    CK = Check / RE = Replace TEST PROCEDURE A B C D E E F F G H RE RE RE RE CK CK L M N POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall receptacle.
  • Page 16 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 17 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 18 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 AND SECONDARY SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2.
  • Page 19 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. Screw Driver WHT/WHT Monitor Switch Ohmmeter Primary Interlock Switch Secondary Interlock Switch BLOWN MONITOR FUSE TEST 1.
  • Page 20 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal. If the Key unit is defective.
  • Page 21 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Re-install the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. RELAY TEST Disconnect the power supply cord, and then remove outer case. 2.
  • Page 22 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 23 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 24 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 ABSOLUTE HUMIDITY SENSOR CIRCUIT With this voltage given, the switches SW1 to SW5 in (1) Structure of Absolute Humidity Sensor the LSI are turned on in such a way as to change the The absolute humidity sensor includes two thermistors resistance values in parallel with R107 ~ R111 of IC2 as shown in the illustration.

  • Page 26: Component Replacement And Adjustment Procedure

    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 27 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. Special screw NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations.
  • Page 28 OVEN LAMP AND LAMP SOCKET REMOVAL Terminals 1. Disconnect the power supply cord and remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Remove the wire leads from the oven lamp the terminal Screw by pushing on the positive lock lever (C-1).
  • Page 29 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 30 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/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH ADJUSTMENT 1.
  • Page 31 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 33: Parts List

    Outer case cabinet CONTROL PANEL PARTS 3- 1 CPWBFB140MRU0 Control unit 3- 2 FPNLCB408MRK0A Control panel frame with key unit (VMOS201SS) 3- 2 FPNLCB543MRK0B Control panel frame with key unit (VMOS201WH) 3- 2 FPNLCB616MRK0A Control panel frame with key unit (VMOS201PL)
  • Page 34 NTNT-A099WRE0 Turntable tray 6- 5 TCAUAA292WRRZ Monitor caution label 6- 6 TCAUAB048MRR0 DHHS/Screw caution label 6- 7 UDSKDB002MRK2 Viking CD (Installation, Operation, Cookbook, etc.) 6- 8 QW-QZA258WRZZ High voltage wire A 6- 9 TCADUB010MRR0 Recipe card 6-10 TLAB-B047MRR0 Menu label...
  • Page 35 OVEN AND CABINET PARTS 4-16 6-12 6-11 1-14 6-13 4-11 1-13 4-15 4-14 4-13 1-10 6-10 7-10 4-10 1-11 1-12 4-12...
  • Page 36 CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 37: Packing And Accessories

    PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET PLASTIC BAG TRAY HOLDER 6-4 TURNTABLE TRAY 6-7 VIKING CD 6-9 RECIPE CARD BOTTOM PAD ASSEMBLY 6-3 TURNTABLE SUPPORT PACKING CASE Non-replaceable items.
  • Page 38 NOTES...
  • Page 39 NOTES...
  • Page 40 © 2011 BY VIKING COPYRIGHT ALL RIGHTS RESERVED No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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