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DMOS200
CDMOS200
VMOS200
CVMOS200
SERVICE MANUAL
S72M194DMOS2E
MICROWAVE OVEN
COOK
DMOS200
MODELS
CDMOS200
VMOS200
CVMOS200
(DMOS200 model shown)
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. (I
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DMOS200 CDMOS200 VMOS200 CVMOS200 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
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CDMOS200 DMOS200 VMOS200 CVMOS200 Notes 1
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CDMOS200 DMOS200 VMOS200 CVMOS200 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.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is co
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CDMOS200 DMOS200 VMOS200 CVMOS200 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. A. Requirements: Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with its servic
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CDMOS200 DMOS200 VMOS200 CVMOS200 MICROWAVE MEASUREMENT PROCEDURE (USA) A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven 2 should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition 2 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. 2) Safety interlock switche
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CDMOS200 DMOS200 VMOS200 CVMOS200 SERVICE MANUAL VIKING RANGE CORPORATION PRODUCT DESCRIPTION MICROWAVE OVENS DMOS200 CDMOS200 GENERAL INFORMATION VMOS200 CVMOS200 FOREWORD OPERATION This Manual has been prepared to provide Viking Service Personnel with Operation and Service Information for the Viking Microwave Ovens, DMOS200, CDMOS200, VMOS200, CVMOS200 . TROUBLESHOOTING GUIDE AND It is recommended that service personnel carefully study the entire text of TEST PROCEDURE this manual so that the
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CDMOS200 DMOS200 VMOS200 CVMOS200 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" Depth 18-5/8" Tray Size 15" Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds) Microwave Pow
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CDMOS200 DMOS200 VMOS200 CVMOS200 adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally. CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE- MOVE THE ROUND GROUNDING PRONG FROM THIS PLUG. OVEN DIAGRAM 1. One touch door open button. Push to open door. 5 6 2. Door latches. 7 12 The oven will not operate unless the 9 d
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CDMOS200 DMOS200 VMOS200 CVMOS200 OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during the primary switch and primary and is mechanically oven operation. associated with the door so that it will function in the following sequence. OFF CONDITION 1) When the door opens from the closed position, the primary switch, secondary switch, door sensing switch, and Closing the door activates the door sensing switch and secondary interlock relay open their
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CDMOS200 DMOS200 VMOS200 CVMOS200 2. The coil of shut-off relay (RY-1) is energized, the turntable motor are turned on, but the power transformer SENSOR COOKING CONDITION is not turned on. 3. After about 16 seconds, the cook relay (RY-2) is Using the SENSOR function, food is cooked without figuring energized. The power transformer is turned on, time, power level or quantity. When the oven senses enough microwave energy is produced and first stage is started. steam from the food, it relays th
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CDMOS200 DMOS200 VMOS200 CVMOS200 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY SECONDARY PR IMAR Y SWITCH SWITCH N.O. COM. N.O. COM. TTM OL FM CAPACITOR 1.0µF AC 2300V DOOR SENSING SWITCH N.O. COM. COM. A1 B1 B2 H A2 N 120V AC POWE R 60 Hz TR ANS FOR ME R (R Y-2) GR N (R Y-1) N.C . MONITOR SECONDARY SWITCH INTE R LOC K RELAY COM. H.V. R E C TIFIE R N.O. CONTR OL UNIT MAG NE TR ON COM. NOIS E FILTE R UNIT Figure O-1 Oven Schematic - Off Condition SCHEMATIC
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CDMOS200 DMOS200 VMOS200 CVMOS200 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the monitor fuse blows simultaneously with closing The door is opened by pushing the open button on the control of the monitor switch contacts. panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then CAUTION: BEFORE REPLACING A BLOWN MONITOR the switch lever pushes up the latch head. The latch heads FUSE, TEST MONITOR SWITCH AND PRI- are
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CDMOS200 DMOS200 VMOS200 CVMOS200 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. These tests are given a procedure letter which will be found in the "Test Procedure "section. IMPORTANT: If the oven becomes inop
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CDMOS200 DMOS200 VMOS200 CVMOS200 CK = Check / RE = Replace RE RE AB C D E E F F G H RE RE CK I CKCKCK J K L M N TEST PROCEDURE POSSIBLE CAUSE AND DEFECTIVE PARTS PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall receptacle. OFF CONDITION All letters and indicators do not appear in display when power cord is first plugged into wall outlet. Display does not operate properly when STOP/CL
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CDMOS200 DMOS200 VMOS200 CVMOS200 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. This test should indicate an infinite resistance. If there is little or no resistance the magnetron is grounded and must be
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CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER C 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. If a short is indicated in both direct
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CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA- TURE, REPLACE TEMPERATURE FUSE. F PRIMARY AND SECONDARY SWITCH 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 switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indi
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CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 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 Screw Driver functions. RED WHT/WHT Monitor Switch Ohmmeter Primary Interlock Switch Secondary Interlock Switch H BLOWN MONITOR FUSE TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the
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CDMOS200 DMOS200 VMOS200 CVMOS200 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. 1) Disconnect the power supply cord, and then remove outer case. 2) Open the door and block it ope
