DMOS200 CDMOS200 VMOS200 CVMOS200 SERVICE MANUAL S72M194DMOS2E MICROWAVE OVEN COOK MODELS (DMOS200 model shown) DMOS200 CDMOS200 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.
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.
CDMOS200 DMOS200 VMOS200 CVMOS200 Notes 1
CDMOS200 DMOS200 VMOS200 CVMOS200 WARNING TO SERVICE PERSONNEL Microwave ovens 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 etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is completed, 1.
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.
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 should not exceed 1mW/cm2 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/cm2 at any point 5cm or more from the external surface of the oven.
CDMOS200 DMOS200 VMOS200 CVMOS200 SERVICE MANUAL VIKING RANGE CORPORATION PRODUCT DESCRIPTION MICROWAVE OVENS DMOS200 CDMOS200 VMOS200 CVMOS200 GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Viking Service Personnel with Operation and Service Information for the Viking Microwave Ovens, DMOS200, CDMOS200, VMOS200, CVMOS200 . 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.
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 2.0 Cubic Feet Width 17-3/8" 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.
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 REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG. 1. One touch door open button. Push to open door. 2. Door latches. The oven will not operate unless the door is securely closed. 3.
CDMOS200 DMOS200 VMOS200 CVMOS200 OPERATION DESCRIPTION OF OPERATING SEQUENCE the primary switch and primary and is mechanically associated with the door so that it will function in the following sequence. 1) When the door opens from the closed position, the primary switch, secondary switch, door sensing switch, and secondary interlock relay open their contacts and the monitor switch contacts close. (2) When the door is closed from the open position, the monitor switch contacts open first.
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 is not turned on. 3. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor.
CDMOS200 DMOS200 VMOS200 CVMOS200 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY S E C ONDAR Y S WIT C H N GR N MAG NE T R ON T E MP . F US E N.O. FM C AP AC IT OR 1.0µF AC 2300V DOOR S E NS ING S WIT C H N.O. C OM. C AV IT Y T E MP . F US E 0.0033uF /AC 125V LINE B Y P AS S C AP AC IT OR C OM. TTM OL C OM. A1 B1 B2 A2 P OWE R T R ANS F OR ME R (R Y -2) 0.0033uF /AC 125V 120V AC 60 Hz LINE B Y P AS S C AP AC IT OR H LINE C R OS S C AP AC IT OR 0.
CDMOS200 DMOS200 VMOS200 CVMOS200 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open. open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.
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.
CDMOS200 DMOS200 VMOS200 CVMOS200 CK = Check / RE = Replace Home fuse or circuit breaker blows when power cord is plugged into wall receptacle OFF CONDITION Monitor fuse blows when power cord is plugged into wall receptacle. 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/CLEAR key is touched. (Buzzer should sound and ":" or time of day should appear in display.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 replaced.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER C COMPONENT TEST HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. 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.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE. F PRIMARY AND SECONDARY SWITCH TEST 1. 2. 3. 4. 5. 6. 7. 8. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. Reconnect all leads removed from components during testing. Reinstall the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Run the oven and check all Screw Driver functions. RED WHT/WHT Monitor Switch Ohmmeter Primary Interlock Switch H Secondary Interlock Switch BLOWN MONITOR FUSE TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case.
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 open. 3) Discharge high voltage capacitor.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER M COMPONENT TEST 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. 1. Foil pattern check and repairs. 1) Disconnect the power supply cord, and then remove outer case. 2) Open the door and block it open. 3) Discharge high voltage capacitor.
TEST PROCEDURES PROCEDURE LETTER N CDMOS200 DMOS200 VMOS200 CVMOS200 COMPONENT TEST 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. o o 2) Room temperature should not exceed 95 F(35 C). 3) The unit should not be installed in any area where heat and steam are generated.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. (6) Disconnect the leads to the primary of power transformer.
CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER N COMPONENT TEST NOISE FILTER TEST 1. 2. 3. 4. 5. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Disconnect the leads to the primary of the power transformer. Using an ohm-meter, check between the terminals as described in the following table: NOISE FILTER UNIT MONITOR FUSE NOISE SUPPRESSION COIL LINE CROSS CAPACITOR 0.
CDMOS200 DMOS200 VMOS200 CVMOS200 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 4) Relay Circuit A circuit to drive the magnetron, fan motor, turntable motor and light the oven lamp. The touch control section consists of the following units. (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and LSI Unit). 5) Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds (key touch sound and completion sound).
CDMOS200 DMOS200 VMOS200 CVMOS200 LSI(IXA098DR) The I/O signal of the LSI(IXA098DR) is detailed in the following table. Pin No. Signal I/O Description 1 COM5 OUT Common data signal : COM11. Connected to LCD signal COM11. 2 COM4 OUT Common data signal : COM12. Connected to LCD signal COM12. 3 COM3 OUT Common data signal : COM13. Connected to LCD signal COM13. 4 COM2 OUT Common data signal : COM14. Connected to LCD signal COM14. 5 COM1 OUT Common data signal : COM15.
CDMOS200 DMOS200 VMOS200 CVMOS200 Pin No. Signal I/O 34 INT0 IN Description Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H : GND L : -5V 16.7 msec. 35 P07 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G1 line keys on key matrix is touched. 36 P06 OUT Key strobe signal. Signal applied to touch-key section.
CDMOS200 DMOS200 VMOS200 CVMOS200 Pin No. Signal I/O Description 49 AIN5 IN AH sensor input. This input is an analog input terminal from the AH sensor circuit, and connected to the A/ D converter built into the LSI. 50 AIN4 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI. 51 RESET IN Auto clear terminal.
CDMOS200 DMOS200 VMOS200 CVMOS200 103-142 SEG39-SEG0 OUT Segment data signal. Connected to LCD. The relation between signals and LCD are as follows: LSI signal (Pin No.) LCD segment LSI signal (Pin No.) LCD segment SEG 39 (103) .......................... SEG 1 SEG 19 (123) ......................... SEG 21 SEG 38 (104) .......................... SEG 2 SEG 18 (124) ......................... SEG 22 SEG 37 (105) .......................... SEG 3 SEG 17 (125) ......................... SEG 23 SEG 36 (106) ....
CDMOS200 DMOS200 VMOS200 CVMOS200 ABSOLUTE HUMIDITY SENSOR CIRCUIT With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R107 ~ R111 of IC2 . Changing the resistance value results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AN0 terminal of the LSI. The voltage of AN1 terminal will indicat about 16 seconds about -2.50 V.
CDMOS200 DMOS200 VMOS200 CVMOS200 TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc.
CDMOS200 DMOS200 VMOS200 CVMOS200 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.. WARNING: Avoid possible exposure to microwave energy.
CDMOS200 DMOS200 VMOS200 CVMOS200 CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. Special screw Screw Driver (Type: TORX T20 H or GTXH20-100) POWER TRANSFORMER REMOVAL Re-install 1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate. 2.
CDMOS200 DMOS200 VMOS200 CVMOS200 OVEN LAMP AND LAMP SOCKET REMOVAL 1. 2. 3. 4. 5. Disconnect the power supply cord and remove outer case. Open the door and block it open. Discharge high voltage capacitor. Remove the oven lamp from the oven lamp socket. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the small flat type screw driver. 6. Remove the oven lamp socket from the magnetron duct by turning the socket counterclockwise. 7.
CDMOS200 DMOS200 VMOS200 CVMOS200 COOLING FAN MOTOR REMOVAL REMOVAL 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 wire leads from the fan motor. 5. Remove the two (2) screws holding the fan motor to the oven cavity back plate. 6. Remove the fan blade from the fan motor shaft according to the following procedure. 7. Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.
CDMOS200 DMOS200 VMOS200 CVMOS200 3. Secure latch hook (with two (2) mounting screws) to oven flange. 4. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit. Refer to chapter "Test Procedure" and Adjustment procedure. DOOR SENSING SWITCH/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH ADJUSTMENT 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor.
CDMOS200 DMOS200 VMOS200 CVMOS200 SEALER FILM 6. Re-install choke cover to door panel by pushing. Note: After any service to the door; (A) Make sure that door sensing switch and secondary interlock switch are operating properly. (Refer to chapter “Test Procedures”.). (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards. After any service, make sure of the following : 1.
1 2 3 37 4 B LK C N-A C OM. C OM N.O. R Y2 T1 GR Y C N-B 3 2 1 C N-F 1 BLUE MAR K OR G OV E N LAMP AND S OC K E T NOT E : Hot (OR G ) wire mus t be connected to the terminal with blue mark on the oven light s ocket. WHT 5 RED OR G P R IMAR Y S WIT C H C OM. NO Y LW OR G B LK B LK C OM. NO BR N S E C ONDAR Y S WIT C H C OM. GR Y B LK J S T V HR -2N Figure S-1. Pictorial Diagram N.C .
CDMOS200 DMOS200 VMOS200 CVMOS200 2 1 4 3 6 5 A A B B C C C N-C 12P IN LE AD WIR E HAR NE S S Q2 2S B 1238 R 4 27 C 10 LE D C 2 G ND C 3 VC C 1 VA C 4 INT C 9 VR C 5 B UZZE R C 6 OV E N LAMP T UR NT AB LE MOT OR F AN MOT OR C 7 MIC R O C 8 NC B 2 C 11 NC B 2 C 12 DOOR S E NS ING S WIT C H 1S S 270A + – + – R 3 510 1/2w (J 1) Q1 2S B 1238 R 2 680 1/2w c E D C 4 10µ/35v D4 D2 1S S 270A C 3 0.1µ/50v 6 b D1 ZD1 HZ16-1 3 d a D3 R 5 4.7k R 1 2.
GND INT C-2 C-4 C-3 C-10 CN-C + – LD10 LD11 LD12 LD13 C11 0.1µ/50v D20 MA152WA Q20 DTA143EAK P45 CNTRO C20 0.1µ/50v Q30 DTA143EAK P44 R91 3.32kD P05 R90 330 1w P06 Q21 DTA123JKA P07 Q11 DTA143EAK P21 P03 IC-2 BA4558 R93 360kF P23 P02 P24 P01 G7 P22 R92 1.8kF P20 P04 G6 P00 G8 R94 4.7k R97 15k R41 15k G9 G10 G12 G11 G13 D90 MA152WA C92 0.01µ/25v C93 0.01µ/25v C16 0.1µ/50v C17 0.1µ/50v C15 0.1µ/50v C18 0.
CDMOS200 DMOS200 VMOS200 CVMOS200 2 1 4 3 6 5 A A B B (CN - C) 1 R1 B Q3 SP1 D7 VRB C 2 7 8 9 U 1 SH - A 4 E 1 2 D5 D6 SH - B B Q2 C5 5 6 ZD1 R4 R5 R2 D8 R6 D 3 2 E Q1 B C CN - C 1 R3 12 WH - 1 C4 1 9 E C3 CN - B D D RY2 C2 S D4 D2 D1 VRS1 T1 AC 1 VH D3 E F E P 11 C1 10 2 XA CN - A (J1) F F D9 RY1 OMIF D U AC G (CN - D) (D10) OL FM TTM RY3 G H H Figure S-5 Printed Wiring Board of Power Unit 1 2 4 3 40 5 6
CDMOS200 DMOS200 VMOS200 CVMOS200 PARTS LIST ∆” may cause undue microwave exposure. Note: The parts marked “∆ The parts marked “*” are used in voltage more than 250V. REF. NO. PART NO.
CDMOS200 DMOS200 VMOS200 CVMOS200 REF. NO. PART NO.
CDMOS200 DMOS200 VMOS200 CVMOS200 2 1 4 3 6 5 OVEN AND CABINET PARTS 7-10 A A 7-10 7-7 2-3 B B 7-9 4-7 7-7 6-12 7-6 7-2 C 1-14 6-11 1-9 6-6 C 1-5 7-6 7-5 6-14 4-6 7-3 4-11 7-9 7-6 1-13 7-8 4-8 D 1-6 1-15 4-14 1-8 7-8 D 4-2 4-9 7-4 1-10 6-10 6-5 E 1-3 7-2 7-2 6-4 7-5 4-10 1-11 7-6 F 4-3 1-7 4-5 7-1 1-7 1-12 1-6 4-13 F 1-7 2-1 6-3 E 1-4 7-1 4-4 4-1 1-1 1-2 G G 7-5 2-2 2-2 2-2 7-5 2-2 7-5 4-12 H H 1 2 4 3 43 5 6
CDMOS200 DMOS200 VMOS200 CVMOS200 2 1 4 3 CONTROL PANEL PARTS 5 6 3-1 A A 3-2 3-7 3-7 6-13 3-6 B B 3-5 3-3 C C 3-4 5-4 D D 5-7 5-2 DOOR PARTS 5-5 5-3 E E 5-7 5-5 F F 5-1-1 MISCELLANEOUS 5-1-2 5-6 G G 6-1 5-1 6-2 H H 6-8 1 2 4 3 44 Actual wire harness may be different from illustration.
CDMOS200 DMOS200 VMOS200 CVMOS200 PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET PLASTIC BAG TRAY HOLDER 6-4 TURNTABLE TRAY 6-7 OPERATION MANUAL 6-9 RECIPE CARD TO IN E TH 6-3 TURNTABLE SUPPORT PACKING CASE Non-replaceable items.
CDMOS200 DMOS200 VMOS200 CVMOS200 COPYRIGHT © 2002 BY VIKING 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. VIKING RANGE CORPORATION 111 Front St.