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Viking VMOD240SS Service Manual
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Viking VMOD240SS Service Manual

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VIKING SERVICE MANUAL
MICROWAVE DRAWER MODELS
DMOD240SS
Setup/
Sensor
Sensor
Sensor
Sensor
OPEN
OPEN
Help
Popcorn
Reheat
Cook
Cook
Control
Keep Warm
Defrost
Reheat
Reheat
CLOSE
CLOSE
Lock
On/Off
In the interest of user-safety the unit should be restored to its original condition and only parts identical to those specified should
be used.
WARNING TO SERVICE PERSONNEL:
This service manual is intended for use by persons having electrical and mechanical training and a level of
knowledge of these subjects generally considered acceptable in the appliance repair trade. Sharp Electronics
Corporation cannot be responsible, nor assume any liability, for injury or damage of any kind arising from the
use of this manual.
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. (High Voltage Capacitor, High Voltage
Power Transformer, High Voltage Rectifier and Heat sink etc., and Magnetron, High Voltage Harness etc..)
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
SCHEMATICS ...................................................................................................................................................... 0
TEST PROCEDURES .......................................................................................................................................... 
TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................. 9
MICROWAVE DRAWER DISASSEMBLY ............................................................................................................. 27
WIRING DIAGRAMS ............................................................................................................................................ 33
PRINTED WIRING BOARDS ............................................................................................................................... 34
PARTS LIST ......................................................................................................................................................... 38
PACKING AND ACCESSORIES .......................................................................................................................... 43
This document has been published to be used for after sales service only. The contents are subject to change without notice
Start
Start
Power
Power
1
2
3
4
5
Add-A-Minute
Add-A-Minute
Level
Level
Stop/
Stop/
6
7
8
9
0
Timer/
Timer/
Clear
Clear
Clock
Clock

TABLE OF CONTENTS

Range Corporation
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641

VMOD240SS
Setup/
Sensor
Sensor
Sensor
Sensor
Start
Start
OPEN
OPEN
1
2
Help
Popcorn
Reheat
Cook
Cook
Add-A-Minute
Add-A-Minute
6
7
Control
Stop/
Stop/
Keep Warm
Defrost
Reheat
Reheat
CLOSE
CLOSE
Lock
Clear
Clear
On/Off
DMOD240SS
VMOD240SS
SZ7M287D240SS
Power
Power
3
4
5
Level
Level
8
9
0
Timer/
Timer/
Clock
Clock
Page
.

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Summary of Contents for Viking VMOD240SS

  • Page 1: Table Of Contents

    DMOD240SS VMOD240SS VIKING SERVICE MANUAL SZ7M287D240SS MICROWAVE DRAWER MODELS DMOD240SS VMOD240SS Setup/ Sensor Sensor Sensor Sensor Start Start Power Power Setup/ Sensor Sensor Sensor Sensor Start Start Power Power OPEN OPEN OPEN OPEN Help Popcorn Reheat Cook Cook Add-A-Minute Add-A-Minute...

  • 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 @ -888-845-464. If the unit operates with the door open, service person should () 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: Warning To Service Personnel

    DMOD240SS VMOD240SS WARNING TO SERVICE PERSONNEL Microwave Oven units contain circuitry capable of producing 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, Heating Elements, etc..

  • Page 4: Microwave Measurement Procedure

    DMOD240SS VMOD240SS MICROWAVE MEASUREMENT PROCEDURE A. Requirements: ) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed mW/cm at any point 5cm or more from the external surface of the oven, measured prior to...

  • Page 5: Schematics

    MICROWAVE DRAWERS SCHEMATICS DMOD240SS & VMOD240SS FOREWORD This Manual has been prepared to provide VIKING Products. Service TEST PROCEDURE Personnel with Operation and Service Information for the VIKING MICROWAVE DRAWERS. It is recommended that service personnel carefully study the entire...
  • Page 6 DMOD240SS VMOD240SS MICROWAVE DRAWER SPECIFICATION ITEM DESCRIPTION Power Requirements Canada - 7 Volts / 3.0 Amperes / 500 Kw / 60 Hz (CUL) U.S.A. - 20 Volts / 3.6 Amperes / 500 Kw / 60 Hz (UL) Single phase, 3 wire grounded...
  • Page 7 DMOD240SS GENERAL INFORMATION VMOD240SS GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances.
  • Page 8 DMOD240SS VMOD240SS OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions dur- the secondary interlock switch and secondary interlock ing oven operation. relay and is mechanically associated with the drawer so that it will function in the following sequence.
  • Page 9 DMOD240SS VMOD240SS SENSOR COOKING CONDITION 2. The coil of shut-off relay (RY-) is energized, but the Using the SENSOR function, food is cooked without figur- power transformer is not turned on. ing time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its 3.
  • Page 10 DMOD240SS SCHEMATIC (OFF CONDITION) VMOD240SS...

  • Page 11: Test Procedures

    DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 12 DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4) Reconnect all leads removed from components during testing. 5) Re-install the covers. 6) Reconnect the power supply cord after the covers are installed. 7) Run the oven and check all functions.
  • Page 13 DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2. Re-install the outer case (cabinet). 3. Reconnect the power supply cord after the outer case is installed. 4. Run the oven and check all function. DEFROST TEST WARNING : The oven should be fully assembled before following procedure.
  • Page 14 DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER ) Discharge high voltage capacitor. 2) Reconnect all leads removed from components during testing. 3) Re-install the outer case (cabinet). 4) Reconnect the power supply cord after the outer case is installed.
  • Page 15 DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the drawer. 9-4. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pads  once and the number pad 4 once.
  • Page 16 DMOD240SS TEST PROCEDURES VMOD240SS PROCEDURE COMPONENT TEST LETTER Refer to the disassembly instructions found on Page 16. MAGNETRON ASSEMBLY TEST Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds.
  • Page 17 DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SECONDARY INTERLOCK SWITCH TEST . Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
  • Page 18 DMOD240SS VMOD240SS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN MONITOR FUSE TEST . Disconnect the power supply cord. 2. Open the drawer and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. If the monitor fuse is blown when the drawer is opened, check the primary interlock switch, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...

  • Page 19: Touch Control Panel Assembly

    DMOD240SS VMOD240SS TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 6) Power Source Circuit This circuit generates voltages necessary in the control () Key unit unit from the AC line voltage.
  • Page 20 DMOD240SS VMOD240SS DESCRIPTION OF LSI (IC-1) The I/O signal of the LSIis detailed in the following table. Pin No. Signal Description Terminal to change cooking input according to the Model.  - 3 AN5- AN3 By using A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.
  • Page 21 DMOD240SS VMOD240SS Pin No. Signal Description Common data signal. COM0 Connected to LCD signal C4. Connected VC (+5V). 29 - 3 P27- P25 Terminal not used. Segment data signal. SEG20 Connected to LCD segment S24. Signal coming from touch key.
  • Page 22 DMOD240SS VMOD240SS Pin No. Signal Description Magnetron high-voltage circuit driving signal. Microwave cooking mode Other cooking mode To turn on and off the cook relay(RY2). In 00% VARI MODE ON TIME OFF TIME ON TIME OFF TIME 00% power 32 sec.
  • Page 23 DMOD240SS VMOD240SS HUMIDITY SENSOR CIRCUIT (1) Structure of Humidity Sensor the resistance values results in that there is the same The humidity sensor includes two thermistors as shown potential at both F-3 terminal of the absolute humidity in the illustration. One thermistor is housed in the closed sensor and AN6 terminal of the LSI.
  • Page 24 DMOD240SS VMOD240SS TOUCH CONTROL PANEL SERVICING A. On some models, the power supply cord between the 1. Precautions for Handling Electronic Components touch control panel and the oven itself is so short that This unit uses CMOS LSI in the integral part of the circuits.
  • Page 25 DMOD240SS VMOD240SS PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.
  • Page 26 DMOD240SS VMOD240SS COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the 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: Microwave Drawer Disassembly

    DMOD240SS VMOD240SS MICROWAVE DRAWER DISASSEMBLY WARNING: Follow all safety precautions as stated at the beginning of this Service Manual before proceeding! . Before removing Microwave Drawer, take measures to protect the Drawer louver by either removing the louver or by letting the louver over hang off flat protected surface (Fig 1).
  • Page 28 DMOD240SS VMOD240SS 7. To remove the Control Panel Frame Assembly, remove the (2) screws holding the C/P cover to the C/P angle. Then unplug all wires from the Control Unit (Fig 3). Fig. 3 8. Remove the (7) screws holding the C/P angle to the C/P frame.
  • Page 29 DMOD240SS VMOD240SS STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL . Follow the Microwave Drawer disassembly as previously stated 2. Open the drawer and keep it open. in the top position, located on the left side of the unit.
  • Page 30 DMOD240SS DRAWER/SLIDE RAIL REMOVAL VMOD240SS DRAWER ASSEMBLY AND CHOKE REMOVAL . Follow the Microwave Drawer disassembly as previously NOTE: Fig. D-1 stated To remove only the 2. Open the drawer and keep it open. Microwave Drawer, follow steps 3. To discharge the high voltage capacitor, wait for 60 , 2, 5, 8, 9 &...
  • Page 31 DMOD240SS VMOD240SS SWITCH ANGLE REMOVAL/ADJUSTMENT SWITCH ANGLE REMOVAL Fig. S-1 (Locate either the right or left switch angle) . Follow the Microwave Drawer disassembly as previously stated 2. Open the drawer and keep it open. 3. To discharge the high voltage capacitor, wait for 60 seconds.
  • Page 32 DMOD240SS VMOD240SS AUTO DRAWER GEAR REMOVAL/INSTALLATION (This procedure requires a 4" or greater phillips screwdriver) . Disengage any power going to the unit. 2. Open the drawer and keep it open. 3. Remove the top cover and right side cabinet.
  • Page 33 DMOD240SS VMOD240SS Power Supply cord 120V 60Hz NOISE FILTER BOARD to Back Plate CN502 BLK or (SWITCHING POWER SUPPLY) CN502 CN501 MAGNETRON OVEN THERMAL THERMAL CUT-OUT CUT-OUT YLW or N.O. RED or YLW or N.C. THIRD DOOR SWITCH MONITOR COOLING...
  • Page 34 DMOD240SS VMOD240SS CN-A PA154DR D1 -- D4 2.5A 1N4002L x4 CN-H FUSE AC 120V VRS1 60Hz 10G471K SW Reg . 502-3 H- 9 SW Reg. OUT +24V H-11 N.O. MICRO N.O. (O.L) <NOTE> : IF NOT SPECIFIED, 1SS270A ( ) : NOT INSERT PARTS...
  • Page 35 DMOD240SS VMOD240SS...
  • Page 36 DMOD240SS VMOD240SS © 2008 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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