Viking VMOS200 Service Manual

[Page 1] Viking VMOS200

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...

[Page 2] Viking VMOS200

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 ch...

[Page 3] Viking VMOS200

1 CDMOS200 DMOS200 VMOS200 CVMOS200 Notes ...

[Page 4] Viking VMOS200

2 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...

[Page 5] Viking VMOS200

3 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 r...

[Page 6] Viking VMOS200

4 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/cm 2 at any point...

[Page 7] Viking VMOS200

5 CDMOS200 DMOS200 VMOS200 CVMOS200 VIKING RANGE CORPORATION 111 Front St., Greenwood, MS 38930 Tel: (888) 845-4641 SERVICE MANUAL VIKING RANGE CORPORATION MICROWAVE OVENS FOREWORD This Manual has been prepared to provide Viking Service Personnel wi...

[Page 8] Viking VMOS200

6 CDMOS200 DMOS200 VMOS200 CVMOS200 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 ...

[Page 9] Viking VMOS200

7 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 tr...

[Page 10] Viking VMOS200

8 CDMOS200 DMOS200 VMOS200 CVMOS200 OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. OFF CONDITION Closing the door activates the door sensing switch and secondary interlock swit...

[Page 11] Viking VMOS200

9 CDMOS200 DMOS200 VMOS200 CVMOS200 SENSOR COOKING CONDITION Using the SENSOR function, food is cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocesso...

[Page 12] Viking VMOS200

10 CDMOS200 DMOS200 VMOS200 CVMOS200 Figure O-2 Oven Schematic - Cooking Condition Figure O-1 Oven Schematic - Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY SCHEMATIC 3. VARIABLE COOKING CONTROL "...

[Page 13] Viking VMOS200

11 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 th...

[Page 14] Viking VMOS200

12 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...

[Page 15] Viking VMOS200

13 CDMOS200 DMOS200 VMOS200 CVMOS200 A MAGNETRON ASSEMBLY 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. TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST ...

[Page 16] Viking VMOS200

14 CDMOS200 DMOS200 VMOS200 CVMOS200 B POWER TRANSFORMER 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 primary input terminals and meas...

[Page 17] Viking VMOS200

15 CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT 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. If the capacitor is ope...

[Page 18] Viking VMOS200

16 CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT 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. Before performing this t...

[Page 19] Viking VMOS200

17 CDMOS200 DMOS200 VMOS200 CVMOS200 H BLOWN MONITOR FUSE TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT 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. ...

[Page 20] Viking VMOS200

18 CDMOS200 DMOS200 VMOS200 CVMOS200 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...

[Page 21] Viking VMOS200

19 CDMOS200 DMOS200 VMOS200 CVMOS200 COMPU DEFROST TEST WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the Defrost...

[Page 22] Viking VMOS200

20 CDMOS200 DMOS200 VMOS200 CVMOS200 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) Follow the troubleshooting guide given below for repair. STEPS OCCUR...

[Page 23] Viking VMOS200

21 CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT 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 ...

[Page 24] Viking VMOS200

22 CDMOS200 DMOS200 VMOS200 CVMOS200 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 mounte...

[Page 25] Viking VMOS200

23 CDMOS200 DMOS200 VMOS200 CVMOS200 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST N 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. Dis...

[Page 26] Viking VMOS200

24 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. 5) Buzzer Circuit The buzzer is responsive to sig...

[Page 27] Viking VMOS200

25 CDMOS200 DMOS200 VMOS200 CVMOS200 16.7 msec. During cooking H : GND L : -5V 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...

[Page 28] Viking VMOS200

26 CDMOS200 DMOS200 VMOS200 CVMOS200 34 INT0 IN Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. 35 P07 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is inpu...

[Page 29] Viking VMOS200

27 CDMOS200 DMOS200 VMOS200 CVMOS200 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 (...

[Page 30] Viking VMOS200

28 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) ......................

[Page 31] Viking VMOS200

29 CDMOS200 DMOS200 VMOS200 CVMOS200 ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled...

[Page 32] Viking VMOS200

30 CDMOS200 DMOS200 VMOS200 CVMOS200 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 extre...

[Page 33] Viking VMOS200

31 CDMOS200 DMOS200 VMOS200 CVMOS200 To remove the outer case, proceed as follows. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Tor...

[Page 34] Viking VMOS200

32 CDMOS200 DMOS200 VMOS200 CVMOS200 POWER TRANSFORMER REMOVAL Re-install 1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate. 2. Secure transformer with four screws to bottom plate. 3. Re-connect wire leads ...

[Page 35] Viking VMOS200

33 CDMOS200 DMOS200 VMOS200 CVMOS200 Terminal Push Pull down 1 2 Lever Positive lock¨ connector CONTROL PANEL ASSEMBLY REMOVAL POSITIVE LOCK ® CONNECTOR (NO-CASE TYPE) REMOVAL Figure C-2. Positive lock ® connector 1. Disconnect the power supp...

[Page 36] Viking VMOS200

34 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 ...

[Page 37] Viking VMOS200

35 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&...

[Page 38] Viking VMOS200

36 CDMOS200 DMOS200 VMOS200 CVMOS200 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 Pro...

[Page 39] Viking VMOS200

37 CDMOS200 DMOS200 VMOS200 CVMOS200 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-1. Pictorial Diagram HIGH VOLTAGE CAPACITOR HIGH VOLTAGE WIRE A H.V. R E CTIFIE R HIGH VOLTAGE COMPONENTS OVEN LAMP AND S OCKE T MAG NE TR ON COM....

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38 CDMOS200 DMOS200 VMOS200 CVMOS200 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-2 Power Unit Circuit + – + – + – A 1 CN-A R4 27 D5 T1 1 3 4 D1 D3 D2 D4 6 ab c d VRS1 (J1) D7D8 1SS270A1SS270A 10G471K C1 0.1µ/50v C3 0.1µ/50v...

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39 CDMOS200 DMOS200 VMOS200 CVMOS200 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-3 CPU Unit Circuit C- 10 C- 9 C- 1 C-8 C-12 F-1 F-2 F-3 G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8 G 9 G10 G11 G12 G13 G14 C-11 C- 3 C- 4 C-2 CN-C GND INT V C L...

[Page 42] Viking VMOS200

40 CDMOS200 DMOS200 VMOS200 CVMOS200 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-5 Printed Wiring Board of Power Unit WH - 1 SH - B SH - A 1 C3 C4 C5 R3 C2 F C1 10 D4 D2 D1 D3 (J1) D9 (D10) RY3 (CN - D) D8 ZD1 VRB DU R2 R1 R6 R5 ...

[Page 43] Viking VMOS200

41 CDMOS200 DMOS200 VMOS200 CVMOS200 REF. NO. PART NO. DESCRIPTION Q'TY CODE PARTS LIST Note: The parts marked “ ∆∆ ∆∆ ∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. ∆ ∆ OVE...

[Page 44] Viking VMOS200

42 CDMOS200 DMOS200 VMOS200 CVMOS200 REF. NO. PART NO. DESCRIPTION Q'TY DOOR PARTS 5 -1 PM110003 Door frame assembly (DMOS200) 1 AK 5 -1 PM110004 Door frame assembly (CDMOS200) 1 AK 5 -1 PM110001 Door frame assembly (VMOS200) 1 AK 5 -1 PM1100...

[Page 45] Viking VMOS200

43 CDMOS200 DMOS200 VMOS200 CVMOS200 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H OVEN AND CABINET PARTS 2-3 4-7 6-11 1-5 4-6 4-8 4-11 7-6 7-2 1-14 4-9 6-10 6-4 6-3 2-1 7-6 1-11 4-10 4-13 7-2 7-2 1-12 1-9 7-3 7-6 7-6 1-8 7-8 7-8 4-...

[Page 46] Viking VMOS200

44 CDMOS200 DMOS200 VMOS200 CVMOS200 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H 5-1 5-1-2 5-1-1 5-3 5-4 5-2 Actual wire harness may be different from illustration. 6-8 6-2 6-1 3-4 3-2 3-3 3-7 3-7 3-1 3-5 3-6 5-5 5-5 5-6 6-13 5-7 5-7 DOO...

[Page 47] Viking VMOS200

45 CDMOS200 DMOS200 VMOS200 CVMOS200 PACKING AND ACCESSORIES Non-replaceable items. DOOR PROTECTION SHEET PLASTIC BAG PACKING CASE TOP PAD ASSEMBLY INTO THE OVEN CAVITY 6-4 TURNTABLE TRAY 6-3 TURNTABLE SUPPORT 6-7 OPERATION MANUAL BOTTOM PAD ASSE...

[Page 48] Viking VMOS200

46 CDMOS200 DMOS200 VMOS200 CVMOS200 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 permiss...