VMOS200
SERVICE MANUAL
S72M194DMOS2E
MICROWAVE OVEN
CDMOS200 MODELS
DMOS200 VMOS200 CVMOS200
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..)
| TABLE OF CONTENTS | Page |
|---|---|
| PRECAUTIONSTOBEOBSERVEDBEFOREANDDURINGSERVICINGTO | |
| AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDEFRONTCOVER | |
| BEFORESERVICING ...................................................................................................... INSIDEFRONTCOVER | |
| WARNINGTOSERVICEPERSONNEL ................................................................................................................2 | |
| MICROWAVEMEASUREMENTPROCEDURE.....................................................................................................3 | |
| FOREWORDANDWARNING................................................................................................................................5 | |
| PRODUCTSPECIFICATIONS...............................................................................................................................6 | |
| GENERAL INFORMATION ...................................................................................................................................6 | |
| OPERATION .........................................................................................................................................................8 | |
| TROUBLESHOOTINGGUIDE .............................................................................................................................12 | |
| TESTPROCEDURE............................................................................................................................................14 TOUCHCONTROLPANELASSEMBLY .............................................................................................................24 | |
| COMPONENTREPLACEMENTANDADJUSTMENTPROCEDURE ..................................................................31 | |
| PICTORIALDIAGRAM ........................................................................................................................................37 | |
| POWERUNITCIRCUIT.......................................................................................................................................38 | |
| LSI UNITCIRCUIT...............................................................................................................................................39 | |
| PRINTEDWIRINGBOARD .................................................................................................................................40 | |
| PARTS LIST........................................................................................................................................................41 | |
| PACKINGANDACCESSORIES .........................................................................................................................45 |
Table Caption: This table of contents outlines a service manual for a microwave oven, detailing precautions, troubleshooting, component replacement, and circuit diagrams. It provides a comprehensive guide for service personnel, covering everything from initial safety warnings to detailed parts lists.
This document has been published to be used for after sales service only.
The contents are subject to change without notice.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
- (a) Do not operate or allow the oven to be operated with the door open.
- (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.
- (c) Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.
- (d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.
- (e) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement 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.
Service personnel should inform VIKING of any certified unit found with emissions in excess of 4mW/cm 2 . The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance.
DANGER CAUTION HIGH VOLTAGE
Do not energize a microwave oven with the outer case cabinet removed, because a microwave oven generates High Voltage in the circuit.
If you intend to operate the oven employing the high frequency switching power converter circuit, you should take special precautions to avoid an electrical
