Viking VCSO210SS User manual

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1
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
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY.......................................................... 2
BEFORE SERVICING ............................................................................................................................................ 2
WARNING TO SERVICE PERSONNEL................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE..................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
GENERAL INFORMATION.................................................................................................................................... 7
WATER SUPPLY/DRAINAGE SCHEMATIC........................................................................................................... 9
TEST PROCEDURE ............................................................................................................................................ 12
ERROR CHECK LIST .......................................................................................................................................... 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE................................................................. 23
PICTORIAL DIAGRAM......................................................................................................................................... 32
PARTS LIST ........................................................................................................................................................ 35
PACKING AND ACCESSORIES .......................................................................................................................... 43
S52M342O210SS
COMBI STEAM/CONVECT™
OVEN
SERVICE MANUAL
This document has been published to be used for after
sales service only.
Range Corporation
111 Front St., Greenwood, MS 38930
Tel: [phone]
VCSO210SS

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PRECAUTIONSTO BE OBSERVED BEFORE AND DUR-
ING 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 compart-
ments, 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 Measure-
ment 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/
cm2. The owner of the unit should be instructed not to use the unit until the oven has been brought into
compliance.
NOTICE
In the interest of user-safety the oven should be restored to its original condition and only parts identical 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. (High Voltage
Inverter Unit, High Voltage Power Transformer, Magnetron, High Voltage Harness etc..)

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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)
Inverter unit that includes High Voltage Capacitor,
High Voltage Power Transformer, High Voltage
Rectifier, Heat sink etc., and Magnetron, High
Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Before Servicing
1. Disconnect the power supply cord , and then
remove outer case.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors
of the inverter unit.
4. Disconnect the high voltage wire from the magnetron
terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire
contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7.Reconnect the high voltage wire to the magnetron terminal
after discharging.
WARNING: Use the pliers that the portions of their
handles are insulated completely to avoid
an electric shock.
WARNING: RISK OF ELECTRIC SHOCK.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet) and the back plate
assembly.
3. Reconnect the power supply cord after the outer case
and the back plate assembly are installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two
(2) minutes. When the two minutes has elapsed (timer at
zero) carefully check that the water is now hot. If the water
remains cold carry out “Before Servicing” procedure and
re-examine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and microwave leakage test should be carried out.
SERVICING FOR INVERTER UNIT
WARNING
This inverter unit contains circuitry capable of produc-
ing high voltage and high current. Contact with any
part of the high voltage will result in electrocution.
DO NOT ACCESS ANY PARTS OF INVERTER UNIT
WITH POWER SUPPLY CONNECTED.
DO NOT OPERATE INVERTER UNIT ITSELF.
It is dangerous because this unit contains high volt-
age components.
Don't Touch !
Danger High Voltage

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MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave
oven should not exceed 1mW/cm2at 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/cm2at any point 5cm or more from
the external surface of the oven.
2) Safety interlock switches:
Primary interlock relay switch shall prevent microwave radiation emission in excess of the requirement as above
mentioned. Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of
5 mW/cm² at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
USA Survey instruments that comply with the requirement for instrumentation as prescribed by the Federal Performance
Standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
Canadian Survey instruments that comply with the requirement for instrumentation as prescribed by CSA and NHW
performance standard for microwave ovens must be used for testing recommended instruments are , NARDA 8100 and
NARDA 8200.
2) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5O C (68OF) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically non conductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
3) Set the cooking control on a Manual Microwave Mode at full power.
4) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement):
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the
oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the
metal has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door, pull the door away from the front of the oven as far as is permitted by the
closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the primary interlock switch/secondary interlock relay does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.

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VIKING RANGE CORPORATION
111 Front St., Greenwood, MS 38930
Tel: [phone]
SERVICE MANUAL
VIKING RANGE CORPORATION
MICROWAVE OVEN
FOREWORD
This Manual has been prepared to provide Viking Service Personnel with
Operation and Service Information for the Viking Microwave Oven.
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.
Check the interlock switches and the door seal carefully. Special attention
should be given to avoid electrical shock and microwave radiation hazard.
WARNING
Never operate the oven until the following points are ensured:
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing.
Service personnel - Do not contact the following parts while the
appliance is energized;
Inverter unit (that includes High Voltage Capacitor, High Voltage
Power Transformer, High Voltage Rectifier and Heat sink etc.)
All the parts marked “*” on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened or
removed.
PRODUCT DESCRIPTION
GENERAL INFORMATION
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
PARTS LIST
VCSO210SS

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SPECIFICATION
ITEM DESCRIPTION
Power Requirements 120 Volts
10.7 Amperes (Microwave) / 12.5 Amperes (Convection)
60 Hertz / Single phase, 3 wire grounded
Power Output 700 watts (IEC 705 Test Procedure)
Operating frequency of 2450MHz
Convection Power Output 1400 Watts
Outside Dimensions Width 20-43/64" Height 16-5/16" Depth 18-5/16" (21” with handle)
Cooking Cavity Dimensions
(1.1 Cubic Feet ) (Stainless Steel) Width 13-36/64" Height 9-1/16" Depth 11-13/16"
Control Complement Heating modes:
Super Steam Convection
Convection
Steam
Microwave
Temperature control:
200 ~ 450oF
Microwave power:
0 ~ 100%
Cooking time range:
0 ~ 2 hours 30 minutes
Clock:
12 hour clock
Oven Cavity Light Yes
Safety Standard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Canadian Standards Association.
Health CANADA, Industry CANADA.

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1
2
3
4
15
14
8
6
9
10
7
16
5
7171 19 20 21
18
12
1113
1 Air vent opening
2 Handle
3 LCD display
4 Contr ol panel
5 Oven light
6 Upper level
7 Lower level
8 Reservoir lid
9 Reservoir
10 Door gasket
11 Latches
12 Ceramic oven floor
13 Door hinges
14 Steam outlets
15 Drip tray lid
16 Drip tray
ACCESSORIES
17 High rack - For Steam
Convection, Convection and
Steam. Do not use when
microwave cooking. Always
place on baking tray.
18 Low rack - For Steam
Convection, Convection and
Steam. Do not use when
microwave cooking. Always
place on baking tray.
19 Baking tray x 2 - For Steam
Convection, Convection,
Steam and Descale function.
Do not use when micr owave
cooking.
20 Steam basket - For Steam.
You can also use for Steam
Convection and Convection.
Do not use when microwave
cooking. Place on high rack in
baking tray.
21 Descaling guide
OVEN COMPONENTS

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CONTROL PANEL
DISPLAY INFORMATION
Dial
2 1
3
1Arrows indicate more than one page;
when you see an arrow, you can turn the
dial to move back and forth between
pages. When there are no arrows, you can
go back to the previous page by touching
BACK/INFO.
2 The illustration at the top of display indicates
the selected cooking mode.
Steam Convection was selected.
Steam was selected.
Microwave was selected.
Convection was selected.
3 Words will light in the display to indicate
features and cooking instructions.
Back/Info
Enter

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FEED-WATER RESERVOIR
Water level sensor
ENGINE UNIT ASSEMBLY
TUBE PUMP
Water level unit
DEW TRAY
Water supply tube
to the engine as-
sembly
Inserting the reservoir delivers water to the water level unit.
Turning the heater ON generates steam.
Dew condensation water in the oven cavity and the exhaust air
duct is discharged to the dew tray
Activation of the
pump delivers
water to the
engine through
the tube.
1. When installing the reservoir
WATER SUPPLY/DRAINAGE SCHEMATIC
2. When steaming and supper steam convection operations

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3. When removing the reservoir
Removing the reservoir discharges remained water in the water level unit to the dew tray.
Remained water
in the tube and
the engine is not
discharged even
with the reservoir
removed.
4. When operating the oven in order to discharge remained water in the engine unit assembly and tube (“Drain
water” mode).
Remained water in the tube is delivered to the engine.
Then the engine heater turn ON so as evaporate
remained water in the engine unit assembly.
Remained water in the water level unit and dew condensation water in the oven cavity
and the exhaust air duct are discharged to the dew tray.
Make sure to
remove the
reservoir.
Remained water
in the tube is
delivered to the
engine unit.