Viking RDMOS201SS Service Manual
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Viking RDMOS201SS Service Manual

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See also: Use and Care Manual , Instruction and Installation Manual
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................................................................. 27
PICTORIAL DIAGRAM ......................................................................................................................................... 33
Range Corporation
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
SERVICE MANUAL

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MICROWAVE OVEN
RDMOS201SS
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
RDMOS201SS
S32M339RDM1SS
MODEL
Page

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Summary of Contents for Viking RDMOS201SS

  • Page 1: Table Of Contents

    RDMOS201SS SERVICE MANUAL S32M339RDM1SS MICROWAVE OVEN MODEL RDMOS201SS 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.

  • 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 RDMOS201SS Notes...

  • Page 4: Warning To Service Personnel

    RDMOS201SS 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

    RDMOS201SS 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 RDMOS201SS 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 7: Foreword And Warning

    RDMOS201SS 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 text of...

  • Page 8: Product Specifications

    RDMOS201SS 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"...

  • Page 9: Oven Diagram

    RDMOS201SS 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

    RDMOS201SS OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions dur- the primary and third door switch and is mechanically ing oven operation. associated with the door so that it will function in the following sequence.
  • Page 11 RDMOS201SS 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 RDMOS201SS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY THIRD PRIMARY DOOR INTERLOCK CAVITY TEMP SWITCH SWITCH FUSE FUSE N.O. COM. N.O. TURN OVEN TABLE LAMP MOTOR MOTOR POWER TRANSFORMER N.C. COM. DOOR N.O. SENSING...

  • Page 13: Description And Function Of Components

    RDMOS201SS DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM CAUTION: BEFORE REPLACING A BLOWN C/T FUSE TEST THE DOOR SENSING SWITCH, SEC- The door is opened by pushing the open button on the con- ONDARY INTERLOCK RELAY (RY2), RELAY trol panel, refer to the Figure D-1. When the open button is...

  • Page 14: Troubleshooting Guide

    RDMOS201SS 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 15: Test Procedure

    RDMOS201SS CK = Check / RE = Replace RE RE A B C D E E F F G H RE RE CK I CK CK CK J K L TEST PROCEDURE POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse or circuit breaker blows...
  • Page 16 RDMOS201SS 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 RDMOS201SS 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 RDMOS201SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. If the C/T fuse is blown when the door is opened, check the secondary interlock relay, primary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.
  • Page 19 RDMOS201SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 3. Discharge high voltage capacitor. 4. Before performing this test, make sure that the primary switch is operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows.
  • Page 20 RDMOS201SS 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.
  • Page 21 RDMOS201SS 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. FROZEN ROLLS/ STEAKS/ MUFFINS CHOPS START FROZEN...
  • Page 22 RDMOS201SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER FOIL PATTERN ON THE PRINTED WIRING BOARD TEST 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 23 RDMOS201SS 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.
  • Page 24 RDMOS201SS 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.
  • Page 25 RDMOS201SS 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 26 RDMOS201SS 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 27: Component Replacement And Adjustment Procedure

    RDMOS201SS 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 28 RDMOS201SS 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 29: Control Panel Assembly Removal

    RDMOS201SS OVEN LAMP AND LAMP SOCKET REMOVAL 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 oven lamp from the oven lamp socket.
  • Page 30 RDMOS201SS 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.
  • Page 31 RDMOS201SS 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/THIRD DOOR SWITCH AND MONITOR SWITCH ADJUSTMENT 1.
  • Page 32 RDMOS201SS 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: Pictorial Diagram

    RDMOS201SS...

  • Page 34: Range Corporation 111 Front St., Greenwood, Ms

    RDMOS201SS © 2012 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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