GE JS998 Series, JT930, JT980, ZET3038, ZET3058 Technical Service Manual

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GE Consumer Products

TECHNICAL SERVICE GUIDE

2003 Slide-In, Single and Double Wall

Ovens with TrivectionTM Cooking

MODEL SERIES:

JS998 JT930 JT980 ZET3038 ZET3058

PUB # 31-9115 3/04

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IMPORTANT SAFETY NOTICE

The information in this service guide is intended for use by individuals possessing adequate backgrounds of electrical, electronic, and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

WARNING

To avoid personal injury, disconnect power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks.

RECONNECT ALL GROUNDING DEVICES

If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened.

PRECAUTIONS TO AVOID POSSIBLE EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY

A. Do not attempt to operate this oven with the door open since

open-door operation can result in harmful exposure to microwave energy . It is important not to tamper with the safety interlocks.

B. Do not place any object between the oven front face and the door

or allow soil or cleaner residue to accumulate on sealing surfaces.

C. Do not operate the oven if it is damaged. It is particularly important

that the oven door close properly and that there is no damage to the:

• Door (bent)

• Hinges and latches (broken or loosened)

• Door seals and sealing surfaces

D. The oven should not be adjusted or repaired by anyone except

properly qualified service personnel.

GE Consumer Products

Technical Service Guide

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Table of Contents

Basics of Element Cycling ..............................................................................................33

Component Locator Views ..............................................................................................12

Components Requiring Oven Removal...........................................................................15

Control Boards Connector Locator..................................................................................28

Control Features................................................................................................................8

Control Panel (

Control Panel Insert (Slide-In Range).................................................................................25

Cooktop (Slide-In Range) ...................................................................................................25

Current Limit Board (

Diagnostics and Service Information ...............................................................................32

Door Switches ................................................................................................................. 24

Failure Codes ..................................................................................................................32

Glass T ouch Assembly (

High Limit Thermal One-Shot TCO .................................................................................23

HVT Cooling Fan (

Introduction ........................................................................................................................4

Left and Right Thermal TCO's ( Left Cooling Fan (

Lower Cooling Fan (Double Wall Oven Only).............................................................................20

Lower Oven Bake and Clean Thermal TCO's (

Magnetron Capacitor and Diode ......................................................................................27

Magnetron Cooling Fan and Thermal TCO (

Microwave Components ..................................................................................................26

Microwave Fuse...............................................................................................................27

Microwave Leakage Test..................................................................................................39

Nomenclature ....................................................................................................................7

Operational Notes ............................................................................................................10

Oven Components ..........................................................................................................15

Oven Light Bulb Assembly...............................................................................................17

Oven Temperature Sensor (

Oven Vent Fan.................................................................................................................2 1

Right Cooling Fan ............................................................................................................20

Sail Switches (

Schematics and Wiring Diagrams ...................................................................................70

Self-Clean Latch Motor ....................................................................................................23

Service Mode ...................................................................................................................34

Stirrer Motor .....................................................................................................................27

Trivection Trivection

TrivectionTM Door Assembly .............................................................................................16

Trivection

Troubleshooting ...............................................................................................................40

Troubleshooting Cooking Loads in Service Mode ............................................................35

Convection Fan Assembly............................................................................19

Convection Fan Motor...................................................................................19

Bake, Broil and Convection Elements..........................................................18

Double and Single Wall Ovens) ....................................................................25

Slide-In Range) .................................................................................29

Slide-In Range) ............................................................................25

Double and Single Wall Ovens) ...............................................................27

Slide-In Range).................................................................22

Slide-In Range).......................................................................................26

Double Wall Ovens)...................................... 22

Wall Ovens) ..................................................26

RTD) .....................................................................................20

Double and Single Wall Ovens).....................................................................21

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Bake

Baking is cooking with heated air. The upper and lower elements cycle back and forth to heat the air and maintain temperature. Used for traditional baking and roasting. Best for delicate items.

Broil

Heat is provided by the upper element to broil your food. May be used with the oven door open or closed.

Convection Bake—Multi and Single Rack

Heat is provided by the element in the back of the oven, along with the upper and lower elements. The air is circulated with a reversing fan system. The fan will change directions to provide optimal

evenness and browning. The Multi Rack option is ideal for evenly baking foods when using more than one rack. The 1 Rack option, used for one rack of food, cooks food faster than BAKE mode.

Convection Roast

Heat is provided by the upper element and circulated with the reversing fan system. The fan will change directions to provide optimal evenness and browning. Good for roasting large tender cuts of

meat or poultry, uncovered. Roasts foods up to 25% faster.

Speed Bake

Heat is provided by the three elements and microwave. The exact combination of elements is automatically determined by the food category selected. Air is

circulated with the reversing fan system described above. Ideal for baking and

roasting foods up to five times faster.

Speed Broil

Heat is provided by the upper element and microwave. Air is circulated with the reversing fan system described above. Oven door must be closed. Ideal for

broiling foods to medium to well done

doneness levels two times faster than traditional broil.

Introduction

The GE Profile oven with Trivection™ technology is a microwave-assist wall oven designed to cook food up to five times faster than a traditional oven. This oven gives the user the flexibility to cook food in traditional cooking modes (bake or broil), convection modes (convection bake and convection roast) or in speedcook modes (speed bake and speed broil). This oven features easy-to-use controls that will guide you through oven operations.

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Model Number

Nomenclature

J T 9 8 0 B H 1 B B

GE Cooking Product J = GE ZE = Monogram Electric

Configuration S = 30-in. Slide-In Oven T = 30-in. Wall Oven

Feature Pack Designates features–the higher the number, the more features.

Nomenclature

Product Color CC = Bisque WW = White BB = Black SS = Stainless Steel

Indicator for Engineering and Product Service Only

Model Year Designator

Glass Color C = Bisque W = White B = Black S = Stainless Steel

Serial Number

The first two numbers of the serial number identify the month and year of manufacture.

Example: AF123456S = January, 2003

The nomenclature plate of the oven is located on the left side of the front frame.

The Mini-manual is located in the control compartment taped to the right side wall.

The nomenclature plate for the double wall oven is located on the lower oven left side of the front frame.

- JAN 2005 - H D - FEB 2004 - G F - MAR 2003 G - APR 2002 - D H - MAY 2001 - A L - JUN 2000 - Z M - JUL 1999 - V R - AUG 1998 - T S - SEP 1997 - S T - OCT 1996 - R V - NOV 1995 - M Z - DEC 1994 - L

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The letter designating the year repeats every 12 years.

Example:

T - 1974 T - 1986 T - 1998

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Using the Oven Controls

SELECT

Control Features

Single oven control.

Double oven control.

CONTROL LOCK

SELECT

CONTROL LOCK

Oven Control Layout and Description

Control Screen & Keypad

All cooking modes, special features and oven settings are directed and operated from the control screen. Directions for operating the oven and prompting for required information are displayed within the control screen.

Numeric Keypad

Used to enter information requiring numbers such as time of day on the clock, timer, oven temperature, start time and length of operation for timed baking and self-cleaning.

Control Lockout

Allows the user to lock the control so that the touch pads cannot be activated when pressed.

Time and Temperature Display

All time and temperature information is displayed in this area as feedback to the user.

Kitchen Timer

Turns the kitchen timer on and off. Does not control the oven.

Oven Light

Turns oven light on or off.

Clear/Off

Cancels ALL oven operations EXCEPT the clock and timer.

If “F– and a number or letter” flash in the display and the oven control signals, this indicates a function error code. Press the CLEAR/OFF pad. Allow the oven to

cool for one hour. Put the oven back into operation. If the function error code repeats, disconnect the power to the oven and call for service.

If your oven was set for a timed oven operation and a power outage occurred, the clock and all

programmed functions must be reset.

The time of day will flash in the display when there has been a power outage.

OVEN

KITCHEN

TIMER

LIGHT

ON/OFF

UPPER OVEN LOWER OVEN

OVEN

LIGHT

KITCHEN

TIMER

ON/OFF

OVEN LIGHT

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Press pad beside display to select item in display.

Oven Control Sleep Feature—Any time the oven is not in use (no cooking, no cleaning, no help and no timers) for more than 10 minutes, the oven control will go to sleep. While sleeping, the control display will not show any text; it will go blank. The clock will remain displayed in the time and temperature display unless the “no clock” option has been selected.

There will be no audible signal given to indicate that the control is entering the sleep feature.

The control will enter the sleep feature even when the control is locked.

The user cannot turn this feature OFF. How to Exit the Sleep Feature—Touch any key. The

function associated with that key will not be started, but the control display main menu will reappear.

Speedcook

In Speedcook mode, the user will be prompted to enter food category, temperature and cooking time. Speed bake—Bakes food faster than traditional cooking modes. Speed broil—Broils food faster than traditional Hi/Lo Broil.

Bake

Traditional bake mode.

Convection

Conv 1-Rack—Convection bake function used for baking on one rack. Conv Multi—Convection bake function used for baking on more than one rack. ConvRoast—Convection roast function.

Broil

LO & HI—Traditional broil function.

Speed broil

Features

Additional cooking-related features.

Defrost—This feature is used to thaw frozen foods.

Self-Clean—This feature cleans the oven. See the Using the self-cleaning oven section.

Warmer—This feature keeps hot, cooked food warm for up to 3 hours. It is not intended for reheating cold food.

Proof—This feature maintains a warm environment useful for rising yeastleavened products. It is not intended to keep food warm or reheat cold food.

Warm (Cook & Hold)—When this feature is turned on, it will keep hot, cooked foods warm for up to 3 hours following a Timed Bake function.

Sabbath—Designed for use on the Jewish Sabbath and Holidays.

SELECT

Control Screen and Keypad

(Continued next page)

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Control Screen and Keypad

Settings

This oven has additional settings that you may choose to use.

NOTE: On double wall ovens, Recipes is available only on the upper oven.

This oven feature allows the user to store up to six temperature/cooking time combinations. The user can then speed bake, bake or convection bake/roast one of the six stored favorite recipes without having to choose the settings each time.

Operational Notes

• The cooking loads (bake, broil, convection

elements, and microwave) are not energized for 15 seconds after the cycle is started.

• In SPEEDCOOK, the time countdown will not start until after the oven is preheated, the door is opened then closed and START is pressed. If START is not pressed, the microwave does not start and the timer does not count down.

Help

Provides basic information on each function and how to find the function. If selected from the home screen, it gives general help. If selected while performing a function, it gives help on that function. Select Exit to leave Help.

Select Prompt

Visual prompt to the user indicating that a selection needs to be made from the control screen.

Door Lock Indicator

Indicates that the oven door is locked for self-clean.

• The convection fan may cycle on and off and change direction while cooking to best distribute hot air in the oven. The convection fan shuts off when the oven door is opened.

• At least one cooling fan will automatically turn on during all cooking modes. This fan turns on to cool internal parts. It may run for up to 20 minutes (up to 85 minutes for double oven models) after the oven is turned off, regardless of oven temperature.

• In SPEEDCOOK, if the door is opened during the cooking cycle, the timer, microwave and convection fan will stop. The elements will continue to cycle on when necessary. Once the door is closed, the convection fan and microwave will operate and the timer countdown will resume.

• In DEFROST, the microwave turns off and the cook time stops counting down when the oven door is opened. They will resume when the door is closed.

• PROOF will not operate when oven is above 125°F. OVEN TOO HOT will show in the display.

• In PROOF and DEFROST, the convection fan will rotate for 1 minute in one direction, then turn off for 10 minutes. Af ter 10 minutes, the fan will rotate for 1 minute again, in the opposite direction.

• When the oven first starts heating, the temperature display will start at 100°F.

• On double oven models, you can set a delay clean in both ovens. However, the second oven set will automatically delay the start of cleaning until the end of the first oven’s clean cycle.

• The RECIPES feature allows you to preset up to six temperature/cooking time combinations with this function. You can then bake, convection bake/roast or speed bake any of these six favorite recipes without choosing settings each time. You cannot program broil, defrost, warmer, proof, speed broil, delay bake or self-clean in RECIPES.

• The oven will remember RECIPES that have been programmed, even after a power outage. The cooking time you enter does not include preheat time. The oven will begin to count down the cooking time after the oven has completed preheating. RECIPES are only available on the upper oven of a double wall oven.

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• On double oven models, you can use timed baking or roasting in one oven while using self-clean in the other; you can also use timed baking or roasting in both ovens at the same time. You will hear a fan while cooking with these features.

Control Lockout (Single and Double Wall Ovens)

• Press the 7 & 8 pads at the same time for 3 seconds. The screen will display CONTROL IS LOCKED.

• To unlock the control, press the 7 & 8 pads for 3 seconds. The display will return to the home screen.

• To turn this feature off, press the BACK pad for 3 seconds. The control returns to the FEATURES screen where SABBATH was originally selected.

Note: This feature remains active even after loss of power to the oven. The only way to exit SABBA TH is to hold the BACK p ad for 3 seconds.

If power is lost while the Sabbath mode is in a heating cycle, the heat will be off when the power is restored.

Sales Mode

• Becomes active upon powering up with 120V only (L1-L2 = 120V , L2 connected to N).

Control Lockout (Slide-In Range)

• Press the CONTROL LOCK pad for 3 seconds. The screen will display CONTROL IS LOCKED.

• To unlock the control, press the CONTROL LOCK pad for 3 seconds. The display will return to the home screen.

If any cooking/cleaning modes are running, entering control lockout will cancel the cooking/ cleaning modes. Then when exiting control lockout, it will go to the home screen.

Sabbath Feature

• This feature disables all but the bake and timed bake modes. Additionally the display does not show the temperature and the sound is disabled.

• The element and oven icons will light randomly within one minute to indicate that the oven is operating. All time functions will remain displayed and active.

• To access the sabbath feature, press the FEA TURES pad, then the MORE p ad.

• To turn this feature on, press the SABBATH pad.

• This mode is NOT accessible on 240V/208V power input. Sales mode requires a special 120 V AC cord (oven L1 connected to power cord L, oven L2 and N connected to power cord N).

• Wall Oven cord kit is Pub # 3-A063 Slide-In cord kit is Pub #3-A073.

Time Settings

• To access the time settings, press the SETTINGS pad on the home screen, then press the appropriate time function pad.

Oven Calibration

Oven calibration offset can be adjusted for the bake mode only . No other cooking modes are affected by changing the bake mode temperature.

1. Press the SETTINGS pad.

2. Press the MORE pad until ± TEMP appears in the display .

3. Press the ± TEMP pad. (Select upper or lower oven for double oven models.)

4. Press the INCREASE or DECREASE pads to change the cooking temperature in 1° increments up to ±35°F.

Note: Oven calibration offset can also be accessed through the service mode under OFFSET. (See

Service Mode.)

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30-in. Single Wall Oven

Component Locator Views

1 - Magnetron Thermal TCO (Thermal Cutout) 2 - High Voltage T ransformer 3 - Magnetron Cooling Fan 4 - High Voltage Capacitor 5 - Left Sail Switch 6 - Stirrer Motor 7 - EMI Filter Board 8 - R1 Sail Switch Relay 9 - Right Sail Switch 10 - Oven Vent Fan 11 - High Voltage T ransformer (HVT) Fan 12 - Right Cooling Fan 13 - Convection Fan 14 - High Limit Thermal One-Shot (TCO) 15 - Main Power Board (MPB)

Rear View

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30-in. Double Wall Oven

8a 8b

1 - Magnetron Thermal TCO (Thermal Cutout) 2 - High Voltage T ransformer 3 - Magnetron Cooling Fan 4 - High Voltage Cap acitor 5 - Left Sail Switch 6 - Stirrer Motor 7 - EMI Board 8 - (a) R2 and (b) R1 Sail Switch Relay 9 - Right Sail Switch 10 - Oven Vent Fan 11 - High Voltage T ransformer (HVT) Fan 12 - Right Cooling Fan 13 - Convection Fan 14 - High Limit Thermal One-Shot (TCO) 15 - Lower Oven Relay Board 16 - Lower Oven Cooling Fan

Rear View

17 - Main Power Board (MPB)

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30-in. Slide-In Range (

Shown with Cooktop Removed)

1 - Magnetron Thermal TCO 2 - High Voltage T ransformer 3 - Left F AD (Fan Apparency Device) TCO 4 - Right FAD TCO 5 - High Voltage Capacitor 6 - Stirrer Motor 7 - Oven Vent Fan 8 - Left Cooling Fan 9 - Right Cooling Fan 10 - High Limit Thermal One-Shot (TCO) 11 - Convection Fan 12 - Current Limit Board (CLB) 13 - EMI Filter Board

14 - Main Power Board (MPB)

Rear View

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Oven Components

Components Requiring Oven Removal

To replace the components listed below, the oven must be removed from its installation.

Double Wall Oven

Single Wall Oven

Slide-In Range

Capacitor Convection Fan Capacitor

Convection Fan Motor(s) Diode EMI Board High Volt age Transformer Left Cooling Fan Lower Oven Cooling Fan Magnetron Magnetron Cooling Fan Magnetron TCO

Main Power Board One-Shot Thermostat Right Cooling Fan Sail Switches

Note: When assembling, the elements, convection fan, and oven light contain special radiation screens and chokes. Be sure to replace these in the oven cavity. Take special care not to strip any screws when replacing these components.

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TrivectionTM Door Assembly

WARNING: A microwave leakage test must be

performed any time a door is removed, replaced, disassembled, or adjusted for any reason. The

maximum leakage is 4 MW/cm Microwave Leakage Test).

(see

Caution: Care must be taken if reinstalling the

door handle. Overtightening screws can damage handle. Hand-tighten screws and make sure handle fits snugly to door panel (do not use electric driver).

To remove the Trivection

Door Gasket:

Caution: The door is very heavy. Use the correct

lifting procedures. Do not lift the door by the handle.

To remove the Trivection

door:

1. Fully open the door.

2. Remove the security screws and clips on each hinge with a Torx 20 (T20) screwdriver.

3. Pull the hinge locks down toward the door frame, to the unlocked position. (This may require a flat-blade screwdriver to start the hinge locks moving).

4. Firmly grasp both sides of the door at the top.

5. Close the door to the door removal position, which is halfway between the broil stop position and fully closed.

6. Lift the door up and out until the hinge arm is clear of the slot.

The door gasket is attached to the inner door panel by spring clips. In addition to being a selfclean gasket, the door gasket has a wire mesh to help seal microwave energy .

Cross the gasket and tuck loose ends into the slots at the bottom of inner panel as shown below.

To remove the outer door:

1. Place the inner door side down on the work area.

2. Remove the eight T15 Torx screws from the outer door (two on each side, four across the bottom).

3. Lift the outer door and handle off the door assembly.

Note: There is no gap at the bottom of the gasket on the TrivectionTM oven door.

To remove the inner glass assembly:

1. Remove the eight

/4-in. hex head screws

holding the insulation retainer .

2. Remove the retainer and insulation.

3. Lift the inner glass assembly off the inner door.

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Bulb

Socket

Ta b

Glass cover

Receptacle

Screen

Inner Glass Assembly

OVEN

Note: Arrows on the side of the inner glass

assembly indicate the direction in which the oven door glass is installed. The arrows should be pointing toward the oven cavity .

Oven Light Bulb Assembly

Inner Door Assembly

The inner door liner, glass and hinges are one assembly and should NOT be separated. All the screws on the inner door assembly have been

torqued to a specific setting and Loctite

sealant

applied to prevent microwave leakage.

To replace the Trivection

door:

1. Firmly grasp both sides of the door at the top.

2. With the door at the same angle as the removal position, seat the indentation of the hinge arm into the bottom edge of the hinge slot. The notch in the hinge arm must be fully seated into the bottom of the slot.

3. Fully open the door. If the door cannot be fully opened, the hinge is not properly seated.

4. Push the hinge locks up against the front frame of the oven cavity , to the locked position.

5. Reinstall the security screws on each hinge.

6. Close the oven door and check for proper alignment, rubbing, etc.

7. Perform the Microwave Leakage Test.

Note: On slide-in models, the door rubbing on the oven cavity may be due to the leveling legs. If the oven is not level it can "rack" the cavity and cause rubbing.

Note: The glass cover should be removed only when cold. Be sure to let the light cover and bulb cool completely . Do not touch a hot bulb with bare hands or a damp cloth.

Replace with a new 130V halogen bulb, not to exceed 50 watts.

Note: Bulbs are 50 watt in Trivection

oven, and

30 watts in the lower oven of double oven.

To remove and replace the oven light bulb:

1. Turn the glass cover counterclockwise

/4 turn until the tabs of the glass cover clear the grooves of the socket.

2. Using gloves or a dry cloth, remove the bulb by pulling it straight out.

3. Using gloves or a dry cloth, remove the new bulb from its packaging. Do not touch the bulb with bare fingers.

4. Push the bulb straight into the receptacle all the way. Then replace the screen.

Note: The screen must be replaced or the life of the bulb will be reduced.

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TrivectionTM Bake, Broil and Convection Elements

WARNING: A microwave leakage test must be

performed any time an element is removed, replaced, or adjusted for any reason. The

maximum leakage is 4 MW/cm Microwave Leakage Test).

Caution: Use caution when removing element

from inside oven cavity due to wire harness layout. There is a possibility of the wire terminals coming loose from the element when pulling the wires through the oven cavity .

Note: When reconnecting the elements, make sure the connectors are securely attached to the element terminals.

The bake and broil elements have special gaskets that keep microwave energy from leaking out of the oven cavity . Replace any worn or damaged gaskets.

(see

Broil Element

• The broil element is rated at 2500 watts, has an approximate resistance value of 22 Ω, and draws approximately 9 amps.

• The broil element is held is place on the back oven wall by:

a. Eleven

/4-in. hex head screws on the

mounting plate.

b. T wo

in. hex head screws on the left and

right element brackets.

Convection Element

Bake Element

• The bake element is composed of an inner and an outer element. It is replaced as one unit.

• The inside element is rated at 2500 watts, has an approximate resistance value of 22 Ω, and draws approximately 9 amps.

• The outside element is rated at 900 watts, has an approximate resistance value of 63 Ω, and draws approximately 3.2 amps.

Inner Element

Outer Element

• The bake element is held is place on the back oven wall by six 1/4-in. hex head screws.

• The convection element is rated at 2500 watts, has an approximate resistance value of 22 Ω, and draws approximately 9 amps.

• The convection element is held in place on the back oven wall by:

a. Six

/4-in. hex head screws on the

mounting plate.

b. One

/4-in. hex head screw on the bottom

element bracket.

Note: Production will be using Torx (T20H) security screws on all elements in the Trivection

oven in the near future.

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Trivection

Convection Fan Assembly

TrivectionTM Convection Fan Motor

The convection fan assembly consists of the fan guard, element, fan blade, and motor.

Refer to the schematic in the back of this manual for circuitry for your specific model.

Trivection

Convection Fan Assembly

The convection fan motor is located on the back of the oven.

The convection fan motor has approximate resistance values between the following wires:

• Red and Blue: 118 Ω

• Red and Black: 58 Ω

• Blue and Black: 58 Ω

Wall Oven Shown

• The element cover is held in place by four

/4-in. hex head screws.

• The convection fan blade nut has left-hand threads. Turn nut clockwise to remove.

Motor Capacitor

• To remove the convection fan motor: a. Remove the four

/4-in. hex head screws

on the inside of the oven cavity .

b. On the back on the oven, remove the 3

outer

/4-in. hex head screws from the 3 brackets that hold the convection motor in place.

Note: The convection fan assembly in the lower oven of the double oven mounts the same as previous convection fan assemblies.

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Oven T emperature Sensor (RTD)

Lower Cooling Fan (Double Wall Oven Only)

The RTD ( Resistive Thermal Device) has a resistance of 1100 Ω at room temperature and 2650 Ω at clean temperature.

Sensor

Right Cooling Fan

The right cooling fan is located in the right rear corner of the control compartment and has an approximate resistance value of 19 Ω.

The lower cooling fan is located between the upper and lower ovens, and has an approximate resistance value of 68 Ω.

The fan can only be removed from the back of the oven.

Right Fan

Rear View

Note: The right cooling fan and the lower cooling

fan of the Double Wall Oven are controlled by a single relay .

Right Fan

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Sail Switches (Double and Single Wall Ovens)

• The left and right sail switches are normally open limit switches located at the rear of the component compartment in front of the cooling fans.

• The sail switches monitor the presence of the airstream from the fans. If either fan (HVT fan or right cooling fan) malfunctions, the applicable sail switch opens and opens relay R1, which disables power to the microwave HVT and oven cooking elements. In addition, if the right cooling fan malfunctions on the double oven, the right sail switch opens and opens relay R2, which disables the lower oven cooking elements.

• The relay coil resistance is approximately 920 Ω.

• It is normal for steam to come out of this vent and the area around the vent to become hot during oven use. It is important to keep the vent unblocked to ensure proper air circulation.

• The oven vent fan motor has an approximate resistance value of 20 Ω and rotates clockwise as viewed from the top.

• To remove the vent fan assembly, remove the four 1/4-in. hex nuts from inside the oven cavity.

Vent Fan

Left Sail Switch

• Both R1 relay and R2 relay (double oven only) are double pole single throw relays. Both contacts are used on R1, only one contact is used on R2.

Oven V ent Fan

The oven is vented above the left side of the door .

Vent Fan Motor

Note: All vent fan p arts are available sep arately. Vent Fan Blade

The vent fan blade nut has right-hand threads. Turn nut counterclockwise to remove.

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Lower Oven Bake and Clean Thermal TCO's (Double Wall Ovens)

Left and Right Thermal TCO's (Slide-In

Range)

The bake and clean FAD's (Fan Apparency Device) TCO's are located between the upper and lower ovens on the floor of the component compartment in front of the fan motor. They are monitored by the controls software.

Both lower oven clean and bake FAD's are ignored by the control when the upper oven is in self-clean.

Bake

Clean

The left and right F AD's (Fan App arency Device) TCO’s are located at the rear of the component compartment, in front of the respective cooling fan.

Left FAD

Right Fan

Bake FAD

• Is wired in series with the lower door unlock motor switch.

• Opens at 185°F and closes when cooled below 158°F .

• The bake FAD can only be detected by the control when in non self-clean operations (unlock switch closed, lock switch open).

Higher Temperature (

Clean) FAD

• Is wired in series with the common of the lock/ unlock switch.

• Opens at 275°F and closes when cooled below 205°F .

• The clean FAD is always detected by the control.

If the thermal switch opens in any mode of operation, the control will display F9 failure code. When this condition exists, check for proper fan operation (look for obstructions), and inspect oven installation (make sure grille areas are not blocked), oven insulation and lock/unlock circuit of lower door lock.

Right FAD

• Both remove power from the controls when open.

• Both are normally closed and wired in series with the magnetron TCO, supplying L1 to the main power board to power the controls.

• The left F AD opens at 185°F and closes when cooled below 158°F. The right TCO opens at 194°F and closes when cooled below 167°F.

• If either FAD opens, check for proper fan operation.

• Each FAD has an internal heater. N is connected to one side of the heaters, and L2 is connected to the other side through the convection DLB relay. The heaters are powered when the DLB relay is energized. The DLB relays are energized continuously in in Service Mode and any cooking or clean mode.

– 22 –

Page 23

High Limit Thermal One-Shot TCO

Self-Clean Latch Motor

The high limit thermal one-shot TCO is located on the rear of the oven behind the center cover and is wired in series with L2 from the terminal block.

Slide-In Range

TCO

Convection Fan

EMI Board

To remove the self-clean latch motor assembly, remove the two 1/4-in. hex head screws.

Motor

Hex Head Screws

1 - Unlock Switch

• Blue and yellow wires.

• Reads closed when the door is unlocked.

Single and Upper Double Wall Ovens

Convection Fan

TCO

• These thermal switches are a non-resettable device and will open at 302°F, indicating a thermal runaway condition.

2 - Lock Switch

• Orange and yellow wires

• Reads infinity when the door is unlocked.

• If tripped, the oven must be removed from installation in order for the one-shot TCO to be replaced.

• Cause of overheating should be determined before replacing the TCO.

– 23 –

Page 24

Door Switches

Oven Door Sense Switch

Safety Interlocks

The microwave interlock system has a left and a right interlock assembly.

Left Interlock Switch Assembly - Door sense switch (NO) and secondary interlock switch (NO) with two 2 position connectors with black and brown wire outputs.

Left Side Door Switches

Door Sense Switch

Secondary Interlock Switch

The oven door sense switch is located in the left interlock assembly on the Trivection

oven.

Proper operation of the door sense switch is required for proper operation of the microwave, oven light, convection fan and the door lock.

To check the door sense switch:

1. Enter the service mode (see

Service Mode).

2. Select DOOR POSITION option and observe the display as the door is opened and closed.

3. If the state (open/closed) does not change on the display , turn of f power and check wiring and switch with ohmmeter.

Interlock and Monitor Switches

Proper operation of the interlock switches and monitor switch are required for proper operation of the microwave system. When troubleshooting or replacing interlock switch assembly, follow the procedure outlined below to verify proper switch operation.

Right Interlock Switch Assembly - Interlock monitor switch (NC) and primary interlock switch (NO) with one 4-position connector with red and black wire outputs.

Right Side Door Switches

Monitor Switch

Primary Interlock Switch

Note: Replace entire left side door switch assembly or right side door switch assembly. Do not replace the individual switches. Switch positions and interlock actuation distance are controlled by assembly of switch-to-mounting bracket. Do not replace or adjust individual switches on door switch assembly.

To check the primary and secondary interlock switches:

1. With power off, attach meter probes to the leads of each switch.

2. Verify the following:

• Closed door circuit must have continuity.

• Opened door circuit must read open.

To check the monitor switch:

1. With power off, attach meter probes to the leads of each switch.

2. Verify the following:

• Closed door circuit must read open.

• Opened door circuit must have continuity.

Important: Any defective or misadjusted components in the interlock monitor , door seal, 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.

– 24 –

Page 25

Control Panel (Double and Single Wall Ovens)

Cooktop (Slide-In Range)

Removal and Replacement

1. Remove the three 1/4-in. hex head screws securing the control panel to the vent trim.

Note: Screws are located under the control panel and can be accessed by opening the oven door and removing them from the bottom.

2. The panel has keyhole slots at the top and is held very tight. Carefully push the panel up, then pull out at the bottom.

Glass Touch Assembly (Slide-In Range)

Removal and Replacement

1. Disconnect power to the range.

2. Remove all surface unit knobs.

3. Unscrew the four plastic crystal retainers on the infinite switches by turning counterclockwise.

Removing and Replacement

1. Remove the Glass Touch Assembly.

2. Remove the

Control Panel Insert.

3. Remove the control panel trim by removing the five front edge of the cooktop and the five

/4-in. hex head screws attached to the

/4-in. hex head screws at the bottom attached to the vent trim.

Note: The retainers should only be hand tightened when reinstalling.

4. Lift the glass touch assembly 3 inches away from the control panel and unplug the ribbon cable from the assembly.

Note: The ribbon cable and connector are very fragile. Take extra care when removing. When reassembling, do not pinch the ribbon connector between the glass and control trim.

Control Panel Insert (Slide-In Range)

Removal and Replacement

1. Remove the

2. Remove the four securing the metal control panel insert to the control panel trim.

3. Disconnect the two wiring harnesses by unplugging the 9-pin and 15-pin connector blocks.

Glass Touch Assembly.

/4-in. hex head screws

4. Remove the two

/4-in. hex head screws securing the cooktop to the body side extensions (1 screw per side).

5. Slide the cooktop assembly forward and lift the cooktop off.

Note: Take extra care with the harness when reinstalling the cooktop.

The 4 heating elements come in 3 sizes:

4. Disconnect the 4 connectors on the main logic board (MLB).

Note: When reassembling, carefully position the harness wires when reinserting the control panel insert.

• Two 6-in. 240V, 1500W

• One 9-in. 240V, 2500W (dual unit 6-in. and 9in.)

• One 8-in. 240V, 2000W

– 25 –

Page 26

Microwave Components

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. If the oven operates with the door open,

instruct the user not to operate the oven and contact the manufacturer immediately.

C. Make the following safety checks on all ovens

to be serviced before activating the magnetron or other microwave source, and make repairs as necessary:

D. Before turning on microwave power for any

test or inspecting within the microwave generating compartments, check the magnetron, wave guide or transmission line and cavity for proper alignment, integrity and connections.

E. Any defective or misadjusted components in

the interlock monitor, door seal and microwave generation and transmission systems shall be repaired, replaced or adjusted by procedure described in this manual before the oven is released to the owner.

F. A microwave leakage check to verify

compliance with the federal performance standard should be performed on each oven prior to release to the owner.

WARNING: To prevent electrical shock, use extreme caution when diagnosing oven with outer covers removed and power on. The high voltage circuit of the magnetron power area (HVT, capacitor , diode, magnetron) is 4400V potential with respect to ground. Wait at least 5 minutes after disconnecting power before servicing the magnetron power area.

TCO

Magnetron Fan

• The magnetron cooling fan motor has an approximate resistance value of 68 Ω.

• The magnetron TCO is located on top of the magnetron housing and is wired in series with L1 to the main power board.

• Check for proper magnetron cooling fan operation (blockage, blades not turning).

• When the temperature on the magnetron TCO reaches 320°F, the magnetron TCO opens and removes power to the controls. When cooled below 140°F, it closes and restores power to the controls.

• The magnetron fan, HVT fan, and magnetron stirrer are controlled by a single relay on the single and double wall ovens.

Left Cooling Fan (Slide-In Range)

The left cooling fan cools the HVT and magnetron and is located in the left rear corner of the control compartment. It has an approximate resistance value of 13 Ω.

The left cooling fan and the magnetron stirrer are controlled with a single relay .

Left Fan

Magnetron Cooling Fan and Thermal TCO (Wall Ovens)

Note: The magnetron is covered under an

additional 4 year warranty. The customer is responsible for any labor or in-home service during this time.

– 26 –

Page 27

HVT Cooling Fan (Double and Single Wall

Ovens)

• Located in the left rear corner of the control compartment.

• Has an approximate resistance value of

14.5 Ω.

Stirrer Motor

HVT Fan

High Voltage Transformer

Magnetron Capacitor and Diode

Caution: The capacitor holds its 4400V charge

for at least 2 minutes after power is removed. Always be certain that the capacitor is discharged before servicing. Mechanically discharge by placing an insulated handle screwdriver between the diode connection of the capacitor and oven chassis ground.

The magnetron capacitor and diode are located in the left rear corner of the control compartment next to the high voltage transformer .

High Voltage Transformer

Microwave Fuse

The microwave fuse is located in the front corner of the control compartment next to the vent fan.

Vent Fan

Microwave Fuse

When replacing the microwave fuse, use only the 20 amp fuse, WB08T10027.

If the door interlock switches fail (monitor switch fails to open when door is closed, or the right primary interlock switch fails to open when door is opened), the fuse will open due to having 240V/ 208V across it. The fuse may open if there is arcing across the switches or they open/close too slowly . The fuse may also open due to a voltage or current spike during normal operation.

Capacitor

Diode

Stirrer Motor

The stirrer motor drives the antenna assembly and is located in the center of the control compartment.

The stirrer motor has an approximate resistance value of 3.4K Ω. The motor rotation direction is random at each start.

– 27 –

Page 28

Control Boards Connector Locator

WARNING: Components are electrically HOT when voltage is connected to oven.

Main Logic Board

When installing a new main logic board, the type of oven (Profile, Monogram or Kenmore) needs to be entered once power is reconnected. Follow the instructions on the display.

If the oven control type needs to be re-entered, enter special modes screen by pressing 0803 within 5 minutes of reconnecting power.

1. Press Factory1 to enter the factory mode.

2. Press CHANGE to choose a different oven type.

3. Press ACCEPT to confirm.

4. Press EXIT.

J9 - DC power output and serial data bus to/from Glass Touch Signal Board J2 J7 - Input from Switches and Sensors J4 - (Single Wall Oven) - No connection

(Double Wall Oven) - DC power output and relay control outputs to Lower Oven Relay Board J9 (Slide-In Oven) - 5 VDC power output and 4 surface unit status signals inputs to J4 Main

Logic Board

J3 - Relay control outputs to Main Power Board J1 J5 - DC power input and line monitor signals from Main Power Board J3 J2 - DC power output and data output to Text Display Board J1

– 28 –

Page 29

Main Power Board

J102

K11

J117

J114 J113

J112

J101

J103

K103

COM

K102

COM

J108

COM

J111 J107

J1 - Relay control inputs from Main Logic Board J3 J3 - DC power output and line monitor signals to K11 - L2 Double Line Break Relay for upper oven

Main Logic Board J5

broil, bake, and bake 2 elements

K10

COM

J105 J109

Note: Although the board is marked SWO, it is used in all ovens.

K7 - Broil ON/OFF

Relay

K8 - Bake ON/OFF Relay J4 - Output to 120 VAC loads (lamps/motors/fans) K102 - L2 Double Line Break Relay for convection element K10 - Convection Element ON/OFF Relay K103 - Bake 2 ON/OFF Relay

Current Limit Board (Slide-In Range Only)

J2 - L2 and power signals from surface unit

elements

J1 - 5 VDC power input and 4 surface unit

status signals output to J4 Main Logic Board

The current limit board receives power signals from the infinite switches and converts them to logic signals so the main logic board can detect on/off status.

– 29 –

Page 30

Lower Oven Relay Board (Double Wall Oven

Only)

K121 - Double Line Break (DLB) Relay (Broil/Bake/

Convection)

K20

K121

COM

K20 - Convection Element ON/OFF Relay K17 - Bake Element ON/OFF Relay K14 - Broil Element ON/OFF Relay J9 - DC power input and relay control inputs

from Main Logic Board J4

J11 - Latch motor, oven lamps and convection

fan outputs

J123

COM

J121

J11

K17

K14

COM

Glass Touch Signal Board

J1 - Input and output signals from/to Glass

Touch Board J1

J2 - DC power input and serial data bus to/

from Main Logic Board J9 1 - LED Status Light The glass touch signal board provides a serial

communication interface between the glass touch board and the main logic board.

The glass touch signal board has an LED status light which should light anytime a pad is touched on the glass touch assembly.

– 30 –

Page 31

Control Panel and Board Layout

1 - Time/Temperature Display Board

2 - Glass Touch Signal Board

3 - Glass Touch Board

4 -Main Logic Board

5 -Text Display Board

Glass Touch Board

J1 - Output and input signals from/to Glass Touch Signal Board J1

Text and Time/Temperature Display Boards

1 - DC power and serial data from Text Display Board to Time/Temperature Display Board (hard

wired to T ime/Temperature Display Board)

2 - DC power input and data Input from Main Logic Board J2 (hard wired to Text Display Board)

– 31 –

Page 32

POWER MONITOR ERROR CODES

During Power-Up (occurs only during power-up)

Normal Power– L1-L2 L1-N No message >150VAC >90VAC AND <150VAC

SUPPLY OPEN L1-L2 L1-N NEUTRAL NA <90VAC

SUPPLY L1-L2 L1-N MISWIRED <90VAC >90VAC AND <150VAC

L1-L2 L1-N NA >150VAC

SENSE 120V L1-L2 L1-N ENTERING >90VAC and <150VAC >90VAC AND <150VAC SALES MODE

After Power-Up (can occur anytime during operation)

Normal Power– L1-L2 L1-N No message NA >90VAC AND <150VAC

SUPPLY OPEN L1-L2 L1-N NEUTRAL NA <90VAC

SUPPLY L1-L2 L1-N MISWIRED NA >150VAC

LOW POWER L1-L2 L1-N

<150VAC NA

Note: Low Power supersedes Supply Open Neutral

Diagnostics and Service Information

WARNING: To prevent electrical shock, use

extreme caution when diagnosing oven with outer covers removed and power on. The high voltage circuit of the magnetron power area (HVT, capacitor, diode, magnetron) is 4400V potential with respect to ground. Wait at least 5 minutes after disconnecting power before servicing the magnetron power area.

WARNING: Heat sinks on main power board are electrically live. Take special precautions when troubleshooting the main power board with power on. If the main power board has failed, the board capacitor can hold a voltage charge on the heat sinks. Wait at least 5 minutes after disconnecting power before servicing the main power board.

– 32 –

Page 33

Basics of Element Cycling

TrivectionTM Oven

Lower Oven

Bake

Broil Convection Bake Multi Convection Bake 1-Rack Convection Roast Self-Clean

bake & broil as required

broil as re convection as re bake & broil as re bake & broil as re bake & broil as re

uired

uired uired uired

Double Wall Oven - Left cooling fan turns OFF after 5 minutes if the current oven operation does not require it ON. The vent fan turns OFF after a minimum of 7 minutes and the sensor temperature <200°F for 2 minutes. The right & lower oven cooling fans turn OFF after a minimum of 7 minutes and the sensor temperature <200°F for 2 minutes or after about 20 to 85 minutes, whichever comes first (time varies depending on which oven was used last).

Single Wall Oven - Left cooling fan turns OFF af ter 5 minutes if the current oven operation does not require it ON. The vent fan turns OFF after a minimum of 7 minutes and the sensor temperature <200°F for 2 minutes. The right cooling fan turns OFF after a minimum of 7 minutes and the sensor temperature <200°F for 2 minutes or after about 20 minutes, whichever comes first.

option to use in

Preheat

NO NA ----- ON YES NA ----- ON YES NA ----- ON YES NA ----- ON

NO NA ----- ON

NA ----- ON

Slide-In Range - The vent fan turns OFF after 22 minutes and the sensor temperature <200°F for 2 minutes. Both cooling fans turn OFF after about 20 minutes.

Note: For the Trivection

oven bake, broil or convection elements or the microwave to operate, BOTH

THE LEFT AND RIGHT COOLING FANS MUST BE ON and engage the sail switches. Note: For the lower oven bake, broil or convection elements to operate, THE RIGHT COOLING FAN

MUST BE ON and engage the right sail switch.

– 33 –

Page 34

Service Mode

The service mode allows the service technician to make adjustments and run several important tests on critical oven components.

MAG TAP - Forces the control to use either the 208 or 240 volt tap on the high voltage transformer. DO NOT use this service feature at this time. Allow the control to select the transformer voltage.

To enter the service mode:

1. Disconnect main power to the oven for at least 15 seconds.

2. Reconnect power and enter 0803 on the keypanel within 5 minutes after the control

initializes. The SPECIAL MODES screen is displayed.

3. Press the SERVICE pad on the SPECIAL MODES screen. The SERVICE MODE screen is displayed.

4. Press the NEXT and BACK pads to scroll through the test list. Choose a test by pressing the appropriate pad.

Service Mode Tests

COOKING LOADS - Verifies proper operation of cooking elements and convection fan. (See

Troubleshooting Cooking Loads in Service Mode to perform tests.)

Note: There is a 5 second delay in the electronic control activating cooking loads in service mode.

DOOR LA TCH - Verifies proper operation of door lock motor and switches. Press the LOCK pad: a red lock icon in the display flashes during transition from unlock to lock, then becomes solid on when the door is locked. Press the UNLOCK pad: the red lock icon flashes during transition from lock to unlock, then turns off when the door is unlocked.

DOOR POSITION - Verifies proper operation of door sense switch. Open and close the oven door: the Time/Temperature display indicates the door is open or closed.

RTD - Displays oven sensor temperature in red on Time/Temperature display of the control panel.

VENT F AN - V erifies proper operation of the ventilation fan. Press the ON and OFF pads to cycle the fan. The T ime/Temperature display indicates the fan is ON or OFF.

R COOLING FAN - V erifies proper operation of the right cooling fan. Press the ON and OFF pads to cycle the fan. The T ime/Temperature display indicates the fan is ON or OFF.

L COOLING F ANS - V erifies proper operation of the mag cooling fan, HVT fan and mag stirrer fan (Wall Ovens) or the Left Cooling fan (Slide-in range). Press the ON and OFF pads to cycle the fan. The T ime/Temperature display indicates the fan is ON or OFF.

OVEN LIGHT - V erifies proper operation of oven light. Press the pads ON and OFF to cycle the light. The T ime/Temperature display indicates the light is ON or OFF.

OFFSET - To adjust the oven calibration offset in bake mode. Press the INCREASE or DECREASE pads to change the cooking temperature in 1° increments up to ±35°F. Press the CONFIRM pad to set.

DISPLA Y - Verifies operation of display segments. Press the ON and OFF pads to cycle the display test. Press the CLEAR/OFF key to return display to normal.

KEYS - Verifies proper operation of keyp anel. Press the number pads on the keypanel to test. Each number appears in the Time/Temperature display as the corresponding pad is pressed.

LINE VOL T AGE - Displays line volt age L1-L2 in the upper temperature display .

F CODES - Displays up to last 7 ERC failure codes. Note: Always check failure codes, then clear them.

COOKTOP STAT (Slide-in range) - Indicates the ON/OFF status of the radiant surface elements. The ON indication will occur when the respective infinite switch hot light is lit.

CO SENSOR (Kenmore models only) - Turns the CO sensor and heater on and off.

Press the EXIT pad to return to the home screen.

– 34 –

Page 35

Troubleshooting Cooking Loads in Service Mode

Cooking loads (bake, broil, convection elements and convection fan) can be energized individually

: through the service mode (press the key next to COOKING LOADS, then appropriate load).

Note: There is a 5-second delay in the electronic control activating cooking loads in service mode. When the appropriate load is turned on in the service mode, first verify that the element is heating or the

fan is turning. If load is not energized, check AC relay volt ages according to the second column in the following tables:

Note: Oven must be in the service mode for proper reading. DC voltages are read between the reference pin in the table and ground. See note below table.

RELAY CONTROL TABLE - SINGLE WALL OVEN

SERVICE MODE

Function

Right Cooling Fan

R CoolingFan -> On/Off

Left Cooling Fans

Mag Stirrer

Mag Fan

HVT Fan

L CoolingFans -> On/Off

Oven Light

Ovenlight -> On/Off

Microwave

CookingLoads -> MW

Vent Fan

VentFan -> On/Off

Convection Element

CookingLoads -> ConvElem

Convection Fan

Clockwise

CookingLoads

-> ConvFan -> CW

Convection Fan

Counter Clockwise

CookingLoads

-> ConvFan -> CCW

Broil Element

CookingLoads -> Broil

Bake Element

CookingLoads -> Bake

Bake2 Element

CookingLoads -> Bake2

Door Latch

DoorLatch -> Lock/Unlock

AC VOLTAGES

Main Pwr Board Relay

ON=120VAC (L1-N or L2-N)

or 240VAC (L1-L2)

OFF=0V

L2 = J4-8 (K1-NO)

N = J103

L2 = J4-7 (K5-NO)

N = J103

L1 = J4-5 (K13-NO)

N = J103

HVT T2 = L2 = J107 (K9-NO)

HVT T3 = L2 = J105 (K9-NC)

HVT T1 = L1 = J114

L2 = J4-9 (K106-NO)

N = J103

L1 = K10-NO

L2 = K102-NO (DLB)

L1 = J4-2 (K105-NC)

N = J103

L1 = J4-3 (K105-NO)

N = J103

L1 = K7-NO

L2 = K11-COM (DLB)

L1 = K8-NO

L2 = K11-COM (DLB)

L1 = J113 (K103-NO)

L2 = K11-COM (DLB)

L1 = J4-1 (K2-COM)

N = J103

Relay Control

ON = 0Vdc

OFF = 12Vdc

MPB J1-10 MLB J3-10

MPB J1-9 MLB J3-9

MPB J1-4 MLB J3-4

MPB J1-3 MLB J3-3

MPB J1-16 OFF MLB J3-16 OFF

MPB J1-16 MLB J3-16

MPB J1-18 MLB J3-18

MPB J1-14 MLB J3-14

DC VOLTAGES

Relay Control

ON = 4.6Vdc

OFF = -14Vdc *

MPB J1-17 MLB J3-17

MPB J1-17 OFF

MLB J3-17 OFF

MPB J1-8 MLB J3-8

MPB J1-12 MLB J3-12

MPB J1-6 MLB J3-6

MPB J1-11 MLB J3-11

MPB J1-7 MLB J3-7

MPB J1-11 MLB J3-11

Enable = 4.2Vdc

Disable = -14.0Vdc

MPB J1-1 MLB J3-1

Notes

Fan comes on when entering the cooking loads menu.

K6 (Mag Main Relay) must be energized

MPB J1-5 ON (4.6Vdc)

MLB J3-5 ON (4.6Vdc)

Note: MagTap is automatically selected

by Line Voltage

Fan comes on when entering the cooking loads menu.

K4 (Convection Fan Relay) must be

energized

MPB J1-15 ON (0Vdc)

MLB J3-15 ON (0Vdc)

energized

MPB J1-15 ON (0Vdc)

MLB J3-15 ON (0Vdc)

Broil element must be turned off

Note: Ground reference for dc volta

is J3-2 or J3-4 on MPB or J5-2 or J5-4 on MLB MLB = Main Logic Board

e measurements

MPB = Main Power Board * OFF = 0Vdc if Disable = -14Vdc

– 35 –

Page 36

RELAY CONTROL TABLE - SLIDE IN RANGE

SERVICE MODE

Function

Right Cooling Fan

R CoolingFan -> On/Off

Left Cooling Fans

Mag Stirrer

Left Cooling Fan

L CoolingFans -> On/Off

Oven Light

Ovenlight -> On/Off

Microwave

CookingLoads -> MW

Vent Fan

VentFan -> On/Off

Convection Element

CookingLoads -> ConvElem

Convection Fan

Clockwise

CookingLoads

-> ConvFan -> CW

Convection Fan

Counter Clockwise

CookingLoads

-> ConvFan -> CCW

Broil Element

CookingLoads -> Broil

Bake Element

CookingLoads -> Bake

Bake2 Element

CookingLoads -> Bake2

Oven Door Latch

DoorLatch -> Lock/Unlock

AC VOLTAGES

Main Pwr Board Relay

ON=120VAC (L1-N or L2-N)

or 240VAC (L1-L2)

OFF=0V

L2 = J4-8 (K1-NO)

N = J103

L2 = J4-7 (K5-NO)

N = J103

L1 = J4-5 (K13-NO)

N = J103

HVT T2 = L2 = J107 (K9-NO)

HVT T3 = L2 = J105 (K9-NC)

HVT T1 = L1 = J114

L2 = J4-9 (K106-NO)

N = J103

L1 = K10-NO

L2 = K102-NO (DLB)

L1 = J4-2 (K105-NC)

N = J103

L1 = J4-3 (K105-NO)

N = J103

L1 = K7-NO

L2 = K11-COM (DLB)

L1 = K8-NO

L2 = K11-COM (DLB)

L1 = J113 (K103-NO)

L2 = K11-COM (DLB)

L1 = J4-1 (K2-COM)

N = J103

Relay Control

ON = 0Vdc

OFF = 12Vdc

MPB J1-10 MLB J3-10

MPB J1-9

MLB J3-9

MPB J1-4

MLB J3-4

MPB J1-3

MLB J3-3

MPB J1-16 OFF

MLB J3-16 OFF

MPB J1-16 MLB J3-16

MPB J1-18 MLB J3-18

MPB J1-14 MLB J3-14

DC VOLTAGES

Relay Control

ON = 4.6Vdc

OFF = -14Vdc *

MPB J1-17 MLB J3-17

OR MPB J1-17 OFF MLB J3-17 OFF

MPB J1-8 MLB J3-8

MPB J1-12 MLB J3-12

MPB J1-6 MLB J3-6

MPB J1-11 MLB J3-11

MPB J1-7 MLB J3-7

MPB J1-11 MLB J3-11

Enable = 4.2Vdc

Disable = -14.0Vdc

MPB J1-1 MLB J3-1

Notes

Fan comes on when entering the cooking loads menu.

K6 (Mag Main Relay) must be energized

MPB J1-5 ON (4.6Vdc) MLB J3-5 ON (4.6Vdc)

Note: MagTap is automatically selected

by Line Voltage

Fan comes on when entering the cooking loads menu.

K4 (Convection Fan Relay) must be

energized

MPB J1115 ON (0Vdc)

MLB J3-15 ON (0Vdc)

energized

MPB J1-15 ON (0Vdc)

MLB J3-15 ON (0Vdc)

Broil element must be turned off

Note: Ground reference for dc volta

is J3-2 or J3-4 on MPB or J5-2 or J5-4 on MLB MLB = Main Lo

e measurements

MPB = Main Power Board * OFF = 0Vdc if Disable = -14Vdc

ic Board

– 36 –

Page 37

RELAY CONTROL TABLE - DOUBLE WALL OVEN

AC VOLTAGES

SERVICE MODE

Function

Right Cooling Fans

Right Cooling Fan Upr

Cooling Fan Lwr

R CoolingFans -> On/Off

Left Cooling Fans

Mag Stirrer

Mag Fan HVT Fan

L CoolingFans -> On/Off

Oven Lights Upper

Ovenlight -> up-arrow -> On/Off

Microwave

CookingLoads -> up arrow

-> MW

DWO Board Relay

ON=120VAC (L1-N or L2-N)

or 240VAC (L1-L2)

OFF=0V

L2 = J4-8 (K1-NO)

N = J103

L2 = J4-7 (K5-NO)

N = J103

L1 = J4-5 (K13-NO)

N = J103

HVT T2 = L2 = J107 (K9-NO)

HVT T3 = L2 = J105 (K9-NC)

Relay Control

ON = 0Vdc

OFF = 12Vdc

MPB J1-10 MLB J3-10

MPB J1-9 MLB J3-9

MPB J1-4 MLB J3-4

Main Pwr Board /

HVT T1 = L1 = J114

Vent Fan

VentFan -> On/Off

Convection Element

Upper

CookingLoads -> up arrow

-> ConvElem

Convection Fan

Upper Clockwise

CookingLoads -> up arrow

-> ConvFan -> CW

Convection Fan

Upper Counter

Clockwise

CookingLoads -> up arrow

-> ConvFan -> CCW

Broil Element Upper

CookingLoads -> up arrow

-> Broil

Bake Element Upper

CookingLoads -> up arrow

-> Bake

Bake2 Element Upper

CookingLoads -> up arrow

-> Bake2

Door Latch Upper

DoorLatch -> up-arrow

-> Lock/Unlock

Broil Element Lower

CookingLoads

-> down arrow -> Broil

Bake Lower

CookingLoads

-> down arrow -> Bake

Convection Element

Lower

CookingLoads

-> down arrow -> ConvElem

Oven Light Lower

Ovenlight -> down arrow

-> On/Off

Door Latch Lower

DoorLatch -> down arrow

-> Lock/Unlock

Convection Fan

Lower Clockwise

CookingLoads

-> down arrow

-> ConvFan -> CW

Convection Fan

Lower Counter

Clockwise

CookingLoads

-> down arrow

-> ConvFan -> CCW

Note: Ground reference for dc volta

is J3-2 or J3-4 on MPB or J5-2 or J5-4 on MLB MLB = Main Logic Board ** Lower oven cooling fan may take up to 90 min. to turn off.

L2 = J4-9 (K106-NO)

N = J103

L1 = K10-NO

L2 = K102-NO (DLB)

L1 = J4-2 (K105-NC)

N = J103

L1 = J4-3 (K105-NO)

N = J103

L1 = K7-NO

L2 = K11-COM (DLB)

L1 = K8-NO

L2 = K11-COM (DLB)

L1 = J113 (K103-NO)

L2 = K11-COM (DLB)

L1 = J4-1 (K2-COM)

N = J103

L1 = K14-NO

L2 = K121-COM (DLB)

L1 = K17-NO

L2 = K121-COM (DLB)

L1 = K20-NO

L2 = K121-COM (DLB)

N = J11-1 (K16-NO)

Plunger Switch - NO

L1 = J114

N = J11-3 (K15-COM)

AND

Plunger Switch - NC

L1 = J114

L1 = J11-4 (K122-NC)

N = J103

L1 = J11-5 (K122-NO)

N = J103

e measurements

MPB J1-3 MLB J3-3

MPB J1-16 OFF MLB J3-16 OFF

MPB J1-16 MLB J3-16

MPB J1-18 MLB J3-18

MPB J1-14 MLB J3-14

MPB J9-10 MLB J4-10

MPB J9-13 MLB J4-13

MPB J9-12 MLB J4-12

MPB = Main Power Board * OFF = 0Vdc if Disable = -14Vdc

LRB = Lower Oven Relay Board

DC VOLTAGES

Relay Control

ON = 4.6Vdc

OFF = -14.0Vdc *

MPB J1-17 MLB J3-17

OR MPB J1-17 OFF MLB J3-17 OFF

MPB J1-8 MLB J3-8

MPB J1-12 MLB J3-12

MPB J1-6 MLB J3-6

MPB J1-11 MLB J3-11

MPB J1-7 MLB J3-7

MPB J1-11 MLB J3-11

LRB J9-4 MLB J4-4

LRB J9-7 MLB J4-7

LRB J9-5 MLB J4-5

LRB J9-7 MLB J4-7

LRB J9-6 MLB J4-6

LRB J9-7 MLB J4-7

Enable = 4.2Vdc

Disable = -14.0Vdc

MPB J1-1 MLB J3-1

LRB J9-2

MLB J4-2

LRB J9-2

MLB J4-2

LRB J9-2

MLB J4-2

Fan comes on when entering the cooking loads menu.

K6 (Mag Main Relay) must be energized

MPB J1-5 ON (4.6Vdc) MLB J3-5 ON (4.6Vdc)

Note: MagTap is automatically selected

by Line Voltage

Fan comes on when entering the cooking loads menu.

K4 (Convection Fan Relay) must be

energized MPB J1-15 ON (0Vdc) MLB J3-15 ON (0Vdc)

K4 (Convection Fan Relay) must be

energized

MPB J1=15 ON (0Vdc)

MLB J3-15 ON (0Vdc)

Broil upper must be turned off

Broil Lower must be turned off

Broil Lower and Bake Lower must be

turned off

Door Latch Motor Disabled by Plunger

Switch when Door is Open

ConvFan Disabled by Plunger Switch

when Door is Open

K18 (Conv Fan Low Relay) must be

energized LRB J9-11 ON (0Vdc) MLB J4-11 ON (0Vdc)

ConvFan Disabled by Plunger Switch

when Door is Open

K18 (Conv Fan Low Relay) must be

energized

LRB J9=11 ON (0Vdc)

MLB J4-11 ON (0Vdc)

Notes

– 37 –

Page 38

To turn off all loads that are energized in COOKING LOADS, press the CLEAR/OFF key or exit the COOKING LOADS menu.

• If load is not turned off, additional loads can be turned on at the same time.

• If AC volt age measures OK, then check the load (element, fan, lock motor, HVT, etc.) and/or wiring to the load and repair/replace as required.

• If there is no AC voltage supplied to the load through the power relays per the wiring schematic, then check the DC power supply voltages from the main power board (MPB-J3 connector) to the main logic board (MLB-J5 connector) according to the following table:

CONTROLS DC POWER SUPPLY VOLTAGE TABLE

MPB MLB Signal Name Min Max

J3-1 J5-1 +12Vdc 11.00Vdc 12.75Vdc

J3-2 J5-2 12Vdc, 5Vdc Ground — —

J3-3 J5-3 +5Vdc 4.7Vdc 5.3Vdc

J3-4 J5-4 12Vdc, 5Vdc Ground — —

J3-5 J5-5 -14Vdc -14.75Vdc -12.75Vdc

J3-6 J5-6 Not Connected —

J3-7 J5-7 L1 thru 2M ohm/.47 uF cap on MPB

J3-8 J5-8 L1 thru 2M ohm/.47 uF cap on MPB

J3-9 J5-9 Not Connected —

J3-10 J5-10 NT thru 2M ohm/.47 uF cap on MPB

J3-11 J5-11 Not Connected —

J3-12 J5-12 L2 thru 2M ohm/.47 uF cap on MPB

240VAC line monitor

120VAC line monitor

240VAC line monitor

• If voltages do not measure according to the table above, replace Main Power Board.

• If voltages measure OK, then measure DC voltages according to the previous relay control table (relay control signals columns 3, 4 and 5).

• If the MLB J3 pins do not provide the correct DC voltages, then replace the main logic board.

• If display is blank, the oven light does not operate when the oven door is opened, and the keypanel does not respond, first check DC power supply voltages. Next, check DC voltages at MLB J2: J2-2, J2-4, J2-6, J2-8. They should be +12VDC. If not, replace text display and/or time/temp display .

• If DC power supply voltages are OK, the display is blank, and the keyboard is not responding, replace MLB. If just the display is blank, replace the display . If only the keyboard is not responding, check glass touch display . If OK, replace MLB.

• If oven light does not turn on when door is opened, check oven light relay per relay troubleshooting table. If relay voltages are OK, check door sense switch (see

Door Switches).

– 38 –

Page 39

Microwave Leakage Test

1. Place 275 mL of water in a 600-mL beaker.

2. Place beaker in center of oven shelf.

3. Set meter to 2450-Hz scale.

Microwave Scan Pattern (Scan Highlighted Areas)

Front

4. Enter the service mode (see

Service Mode),

press the keypad next to COOKING LOADS, then press the keypad next to MW (microwave).

5. Time for 5 minute test.

6. Hold probe perpendicular to surface being tested and scan surface at rate of one inch/sec.

7. Test the following areas:

• Entire perimeter of door and control panel.

• Viewing surface of door window .

• Exhaust vents.

Note: Maximum leakage is not to exceed 4 mW/cm

8. Record data on service invoice and microwave leakage report.

Note: Maximum allowable leakage is 5 mW/cm2 (4 mW/cm2 is used to allow for measurement and meter accuracy). Inform manufacturer of any oven found to have emissions in excess of 5 mW/cm2. Make repairs to bring the unit into compliance at no cost to the owner and try to determine cause. Instruct owner not to use oven until it has been brought into compliance.

Sides

Interlock cover

Back (Slide-In)

Performance Testing

Standard test load will be 1 liter (1000-mL) of water with an initial temperature 59° ~ 75°F in a 1000-mL beaker (PN WB64X73).

1. Record initial water temperature.

2. Place beaker in center of middle oven shelf.

3. Enter the service mode (see

Service Mode),

press COOKING LOADS, then press the keypad next to MW .

4. Time for 2 minutes, then open door.

5. Record end water temperature.

6. The minimum difference between the initial and ending temperatures should be 12°F at

240 VAC.

Note: St andard Microlite

test blocks (sometimes called sparkle blocks) are not applicable.

– 39 –

Back (Wall Ovens)

Terminal Connection

Page 40

Oven Dead - Keyboard works - Displays do not work

Oven Dead - Keyboard and displays do not work

Trivection Oven

Main Power Board Main Logic Board

Mag TCO FAD Lef t TCO FAD Right TCO Glass T ouch Signal Board

Glass T ouch Assembly

T ext Display Board

Time/T emp Display LH or RH Sail Switch R1 and R2 Relays Bake Element Bake 2 Element

Broil Element Convection Element Convection Fan

Halogen Lamps

Motor Latch

Left Cooling Fan

Right Cooling Fan

Magnetron

HV Transformer

RT Interlock Switch

L T Interlock Switch

Interlock Monitor Switch

Fuse Mag Stirrer Vent Fan

Troubleshooting

Oven Dead - Displays work - Keyboard does not work

Bake element does not work

Broiler does not work

Convection element does not work

Bake 2 element does not work

Convection fan does not work

Halogen lamps do not work

Latch motor does not work

Page 45

Page 44

Page 42

Page 46

Right cooling fan does not work

Left cooling fan does not work

No Microwave Power

Page 50

Page 48

Stirrer does not work

V ent fan does not work

Page 54

Page 53

Page 52

Page 51

Page 55

Page 56

Page 57

Page 58

Page 59

– 40 –

Page 41

Lower Oven (Double Wall Oven)

Cooktop (Slide-In Oven)

Lower door latch does not work

Lower bake element does not work

Lower broiler element does not work

Lower oven light does not work

Lower convection element does not work

Lower convection fan does not work

Main Logic Board Lower Oven Logic Board Lower Broil Element Lower Bake Element Lower Convection Element

Lower Halogen Lamps

Plunger Switch

Lower Motor Latch

Lower cooling fan does not work

RF elements, one or both does not work

LF, LR, or RR element does not work

Surface Control LF Surface Control LF Surface Element LR Surface Control LR Surface Element

RF Surface Control RR Surface Control RR Surface Element

RF Inner Surface Element Lower Convection Fan Lower Cooling Fan

Page 61

Page 60

Page 62

Page 64

Page 66

Page 65

Page 67

RF Outer Surface Element

Page 69

Page 68

– 41 –

Page 42

Is 120 VAC present on the

EM I filter boa rd connector

from O UT3 to the MP B J103?

Yes

the MPB J102.

from the EMI filter

Repair faulty wiring

board contacts OUT 3 to

Is 120 VAC present on the

contacts IN1 or IN2.

Replace the one-shot TCO or

connection to the EM I filter board

repair faulty wiring from the house

EM I filter b oard connector

Yes

from IN 3 to the M PB J 1 0 3 ?

Replace the

EM I filter board.

Disconnect J101, J102, and J103 from

Is 120 VAC present from the MP B

Yes

the MPB . Is 120 VA C present from the

Yes

connectors J102 to J103?

MP B connectors J101 to J103?

Replace

the MPB .

-14VDC from M P B J3, pin 5 to pin 2

Yes

Check the m ag TCO , (FAD left and FAD

right TC Os, Slide-In models only), or repair

+12VD C from M LB J5, pin 1 to pin 2

Are the following DC voltages present?

connector to the MP B conne ctor J101.

faulty wiring from the EM I filter board OUT1

+5VD C from M PB J3, pin 3 to pin 2

+12VD C from M PB J3, pin 1 to pin 2

Are the following DC voltages present?

Connect J101, J102, and J103 to the MPB.

OU T1 to the MPB J103?

filter board connector from

Is 120 VAC present on the EMI

+5VD C from M LB J5, pin 3 to pin 2

Is 120 VAC present on the

-14VDC from M LB J5, pin 5 to pin 2

EM I filter board connector

the M P B to th e M L B.

Repair fa ulty wiring from

Yes

from IN 1 to the M PB J 1 0 3 ?

Touch the glass touch signal board.

filter board.

Replace the EMI

Oven Dead - Keyboard and Displays Do Not Work

Yes

Does the boardlight come on and beep?

from IN 1 to O UT 2 ?

EM I filter board connector

Is 120 VAC present on the

Replace

Replace the 34 pin cable.

Yes

the MLB.

signal board work?

Does the glass touch

Repair faulty wiring from

the EMI filter board OUT 2

Replace the 10 pin ca ble.

connector to the MP B

signal board work?

Does the glass touch

connector J103.

Replace the glass

touch sign al board.

Yes

filter board .

Replace the EMI

board connector from IN1 to IN2 ?

Is 120 VAC present on the EMI filter

the EMI filter board

contacts IN1 or IN2.

repair faulty wiring from

the house connection to

Replace one-shot TCO or

– 42 –

Page 43

Single Wall Oven and Double W all Oven Models

Slide-In Models

– 43 –

Page 44

Replace the glass

touch signal board.

Replace the MPB.

Repair faulty wiring from

touch assembl y.

Replace the glass

touch signal board.

Does the oven work?

the MPB to the MLB.

Replace the 10 pin cable from the

glass touch signal board to the MLB.

Yes

Replace the MLB.

Does the oven work?

Replace the 34 pin ribbon cabl e from the

glass touch board to t he gl ass touch display.

beep when a key is pressed?

touch signal board li ght up and

Does the oven work?

glass touch board to the MLB.

Replace the 10 pin cable from the

Yes

+5VDC from MPB J3, pin 3 to pin 2

-14VDC from MPB J3, pin 5 to pin 2

+12VDC from MPB J3, pin 1 to pin 2

Oven Dead - Keyboard Works - Displays Do Not Work

Are the following DC voltages present?

+5VDC from MLB J5, pin 3 to pin 2

+12VDC from MLB J5, pin 1 to pin 2

Are the following DC voltages present?

Yes

Does the LED on the glass

-14VDC from MLB J5 , pin 5 to pin 2

– 44 –

Page 45

touch assembly.

Replace the glas s

Does the oven work?

Replace the gla ss touch signal board.

Replace the MLB.

Does the oven work?

Replace the 10 p i n cable from the

glass touch signal board to t he MLB.

Replace

the MLB.

Replace the glass

touch signal board.

Does the oven work?

Replace the 10 pin cable from the

glass touch signal board to the MLB.

Yes

Does the LED on the glass

beep when a key is p r essed?

Oven Dead - Displays Work - Keyboard Does Not Work

touch signa l board light up and

Replace the 34 pin ribbon cable

Does the oven work?

to the glass touch assemb ly.

from the glass touch signal board

– 45 –

Page 46

wiring from the

MLB and MPB .

Replace

the MLB.

wiring from the L1 or L2 input.

Replace R1 or repair the faulty

Repair th e faulty

Yes

to K7 COM ?

MPB relay K8 COM to K7 NC.

Repair the faulty wiring from the

Yes

Replace the bak e element.

Yes

Is 240 VAC

MPB to the bak e el em e nt.

Repair the faulty wiring from the

Is 240 VAC present from the MPB

connectors ?

bake elem ent

present at the

relay K11 COM contact to K7 NC?

MPB relay K 11 NO c o ntac t

Is 240 VAC present from the

Yes

Is 240 VAC present from the MPB

relay K11 COM contact to K7 COM?

Is -14.0 VDC pres e nt fro m th e MLB

Yes

Is 4.6 VDC pres en t from the MLB

connectors J3, pin 11 to J5, pin 2?

Replace

connectors J3, pin 6 to J 5, pi n 2?

Yes

Replace

the MPB.

Is 4.6 V DC present from the MPB

connectors J1, pin 11 to J 3, pin 2?

the MLB.

connectors J 1, pin 6 to J3, pin 2?

Is -14.0 VDC present from the MPB

Replace

the MPB.

No Yes

wiring from the

MLB and MPB.

Repair the faulty

Yes

Is the bake element on?

turn the bake element on.

Enter the servic e mode and

Bake Element Does Not Work

Is 240 VAC pre s ent from t he MPB

relay K11 COM TO K8 NO contacts?

MLB to MPB.

Replace

the MLB.

Yes

Is 4.6 VDC pres en t from

Is 240 VAC pre s ent from t he MPB

relay K11 COM c ont ac t t o K 8 CO M ?

Yes

the MLB connectors

J3, pin 7 to J5, pin 2?

Repair the faulty

Is 4.6 VDC pres en t from

wiring from the

the MPB connectors

MLB to MPB.

J1, pin 7 to J3, pin 2?

Replace

the MLB.

Yes

Is 4.2 VDC pres en t from

Yes

pin 1 to J5, pin 2?

the MLB connectors J3,

Repair the faulty

Is 4.2 VDC pres en t from

wiring from th e

the MPB connectors J1,

pin 1 to J3, pin 2?

Yes

Replace

the MPB.

– 46 –

Page 47

– 47 –

Page 48

Repair the faulty wiring

wiring from the

MLB and MPB.

Replace

the M L B .

from the L1 or L2 input.

Repa ir the faulty

Is 4.6 VDC present from the MPB

connectors J1, pin 11 to J3, pin 2?

the MPB.

Yes

Replace

the MPB.

Yes

Replace

the MPB.

connectors J1, pin 6 to J3, pin 2?

Is -14.0 VDC present from the MPB

wiring from the

MLB and M PB .

Repa ir the fa u lty

Yes

Repair the faulty wiring from the

MP B relay K 10 3 C O M to K 7 N C .

Yes

Replace the bake 2 element.

Yes

Is 240 V AC

MPB to the bake 2 elem ent.

Repair the faulty wiring from the

connectors?

present at the

bake 2 element

K11 COM contact to K7 NC ?

Is 240 VAC present from the MP B relay

Is 240 VAC present from

conta c t to K 7 C OM?

the MPB relay K11 NO

Yes

K11 COM contact to K7 CO M ?

Is 240 VAC present from the MP B relay

Replace

the MLB.

Yes

Is 4.6 VDC present from the MLB

connectors J3, pin 11 to J5, pin 2?

Replace

Yes

connectors J3, pin 6 to J5, pin 2?

Is -14.0 VDC present from the MLB

Replace

the M LB .

Replace

Yes

Is the bake 2 element on?

turn the bake 2 element on.

Enter the service mode and

Bake 2 Element Does Not Work

K11 COM TO K 103 N O contacts?

Is 24 0 V AC pre s en t fro m the M PB rela y

K11 COM contact to K103 CO M ?

Is 24 0 V AC pre s en t fro m the M PB rela y

Yes

Is 0 V D C p res en t fro m the MLB

connectors J3, pin 18 to J5, pin 2?

Yes

connectors J3, pin 1 to J5, pin 2?

Is 4.2 V D C pres en t from the M L B

Yes

from the M L B to M P B.

Repa ir the fa ulty w iring

connectors J1, pin 1 to J3, pin 2?

Is 4.2 V D C pre s en t from the M P B

– 48 –

Page 49

– 49 –

Page 50

MPB to the broil element.

Replace the broil element .

Repair the faulty wiring from t he

Replace

the MLB.

Yes

MLB to MPB.

wiring from the

Repair the faulty

Replace

the MLB.

MLB to MPB.

wiring from the

Repair the faulty

Is 240 VAC

broil element

present at the

Yes

Is the broil elem ent on?

turn the broil element on.

Enter the service mode and

Broiler Does Not Work

K11 COM to K7 NO contacts ?

Is 240 VAC present from the MPB relay

Yes

connectors?

connectors J3, pin 6 t o J5, pin 2?

Is 4.6 VDC present f rom the MLB

Yes

Is 240 VAC present from the MPB

relay K11 COM to K7 COM contacts?

Is 240 VAC present from the MPB

connectors J1, pin 6 t o J3, pin 2?

Is 4.6 VDC present f rom the MPB

Yes

relay K11 NO to K7 COM contact s?

Repair the faulty wiring

from the input of L1 or L2.

Yes

Is 4.2 VDC present f rom the MLB

Yes

Is 4.6 VDC present from the MLB

connectors J3, pi n 11 t o J5, pin 2?

connectors J3, pin 1 t o J5, pin 2?

Replace

Yes

the MLB.

Yes

Is 4.6 VDC present from the MPB

connectors J1, pi n 11 t o J3, pin 2?

Yes

Replace

connectors J1, pin 1 t o J3, pin 2?

Is 4.2 VDC present f rom the MPB

Repair the faulty

Replace

the MPB.

wiring from the

MLB and MPB.

– 50 –

Page 51

MLB to MPB.

Replace

the MLB.

wiring from the

Repair the faulty

Replace

the MLB.

MLB to MPB.

wiring from the

Repair the faulty

Is 4.6 VDC present from the MLB

connectors J3, pin 12 to J5, pin 2?

Yes

Is 4.6 VDC present from the MPB

Repair the faulty

connectors J1, pin 12 to J3, pin 2?

wiring from the

input of L1 or L2.

Yes

connectors J3, pin 1 to J5, pin 2?

Is 4.2 VDC present from the MLB

Replace

the MLB.

Yes

Replace

the MPB.

connectors J1, pin 1 to J3, pin 2?

Is 4.2 VDC present from the MPB

wiring from the

MLB and MPB.

Repair the faulty

Is 240 VAC present from the MPB

relay K10 NO to K102 NO contacts?

the convection element on.

Is the convection element on?

Enter the service mode and turn

Disconnect the co nvection element. Is

Yes

K10 NO to K102 COM contacts ?

240 VAC present from the MPB relay

Yes

Is 240 VAC present from the MPB

relay K10 COM to K102 NO contact s ?

Yes

Is 240 VAC present at the

convection element connectors?

Convection Element Does Not Work

Yes

connectors J3, pi n 8 t o J5, pin 2?

Is 4.6 VDC present f rom the MLB

Replace the

convection element.

from the MPB to the

Repair the faulty wiring

Yes

Replace

the MPB.

connectors J1, pi n 8 t o J3, pin 2?

Is 4.6 VDC present f rom the MPB

– 51 –

Page 52

Repair the faulty

wiring from MPB

relay K105 to K4 .

the faulty wire.

Replace the EMI

filter board or repair

Replace

the MLB.

wiring from the

Repair the faulty

MLB to the MPB.

Is 120 VAC present from

Yes

contact to AC IN (NT)?

the MPB relay K4 COM

Replace

the MLB.

Yes

pin 15 to J5, pin 2?

Is 0 VDC present from

the MLB connectors J3,

to the MPB.

Repair the faulty

wiring from the MLB

Yes

Replace

the MPB.

the MPB connectors

Is 0 VDC present from

J1, pin 15 to J3, pin 2?

Replace

the MPB

Yes

the MPB relay K4 NO

contact to AC IN (NT)?

Yes

MPB relay K105 COM

contact to AC IN (NT)?

Is 120 VAC present from the

No No

Is the convection fan on?

turn the convection fan on.

Enter the service mode and

Convection Fan Does Not Work

Disconnect the convection fan.

K105 NC or NO contact to AC IN (NT)?

Is 120 VAC present from the MPB relay

Is 0 or 12 VDC present

from the MLB connectors

Repair the faulty wire

from MPB relay K105

Yes

Is 120 VAC present from

the convection fan positive

J3, pin 16 to J5, pin 2?

the convection fan.

NO or NC contact to

Yes

connectors to AC IN (NT)?

Is 0 or 12 VDC present

Is 120 VAC present from

J1, pin 16 to J3, pin 2?

from the MLB connectors

Replace the

convection fan.

Yes

faulty ground wire.

board or repair the

the convection fan positive

and negative connectors?

Replace the EMI filter

– 52 –

Page 53

Repair the faulty

Is 120 VAC present from

wiring from L1 input to

the EMI filter board IN1

the EMI filter board OUT1

the EMI filter board.

Yes

filter board.

Replace the EMI

contact to AC IN (NT)?

Yes

contact to AC IN (NT)?

Repair the faulty wiring from

the MPB relay K13 COM

contact to the EMI filter board.

Yes

contact to AC IN (NT)?

the MPB relay K13 COM

Is 120 VAC present from

Are the lights on?

turn the oven lights on.

Enter the service mode and

Halogen Lamp Does Not Work

Remove the halogen bulbs.

Is 120 VAC present from the MPB

relay K13 NO contact to AC IN (NT)?

Is 0 VDC present from

Replace

the MLB.

Yes

the MLB connectors

J3, pin 4 to J5, pin 2?

Replace

the MPB.

input to the EMI filter board.

Repair the faulty wiring from NT

Yes

filter board IN2 contact?

relay K13 NO contact to the EMI

Is 120 VAC present from the MPB

Replace the

EMI filter board.

Yes

Is 120 VAC present from the MPB

Yes

filter board OUT2 contact?

relay K13 NO contact to the EMI

Repair the faulty wiring

Is 120 VAC present from the

from the EMI filter board

MPB relay K13 NO contact to

to the lamp sockets.

the halogen lamp sockets?

the MLB relay K13 NO

Repair the faulty wiring from

contact to the lamp sock ets.

Yes

Is 120 VAC present from the positive

Yes

Replace the

halogen bulb.

halogen lamp sockets?

contact to the negative contact of the

– 53 –

Page 54

filter board.

Repair the faulty wiring

from L1 input to the EMI

Yes

filt er board.

Replace the EMI

contact to AC IN (NT)?

the EMI filter board IN1

Is 120 VAC pr esent from

Yes

contact to AC IN (NT)?

Is 120 VA C present from

the EMI filter board OUT1

Yes

contact to AC IN (NT)?

the MPB relay K2 COM

Is 120 VAC present from

Yes

Does the l atch lock ?

Enter the service mode

and set the latch to lock.

Latch Motor Does Not Work

NO conta ct to AC IN (NT)?

Is 120 VAC present from the MPB relay K2

Discon nect the co nnector on the motor latch.

Repair the faulty wiring from

Is 0 VDC present from

to the EMI filter board.

the MPB relay K2 COM contact

Replace

the MLB.

Yes

the MLB connectors

J3, pin 14 to J5, pin 2?

Replace

the MPB.

input to the EMI filter board.

Repair the faulty wiring from NT

Yes

Is 120 VAC present from the MPB

Yes

filt er board IN2 contact?

relay K2 NO contact to the EMI

filter board.

Replace the EMI

Yes

filter board OUT2 contact?

relay K2 NO contact to the EMI

Is 120 VAC present from the MPB

Repair the faulty wiring

to the motor latch.

from the EMI filter board

Yes

K2 NO contact to the motor latch ?

Is 120 VAC present from the MPB relay

to the motor latch.

Repair the faulty wiring from

the MLB relay K2 NO contact

Yes

motor latch.

Replace the

of the motor latch?

contact to the negative contact

Is 120 VAC present from the positive

– 54 –

Page 55

the EMI filter board.

Replace the one shot

wiring from L2 input to

TCO or repair the faulty

Yes

filter board.

Replace the EMI

contact to A C IN (N T )?

the EMI filter board IN3

Is 120 VAC present from

NOTE:

Yes

The left, rear fan on the S lide-In model is identified as left cooling fan.

The single and double wall oven identify this fan as the HVT fan.

Is 120 VAC present from

the EMI filter board OUT3

the MPB relay K5 COM

contact to A C IN (NT )?

Yes

contact to A C IN (NT )?

Yes

Is 0 VDC present from the MLB

Repair the faulty wiring from

the MPB relay K5 COM

connectors J3, pin 9 to J5, pin 2?

contact to the EMI filter board.

Yes

Replace

the MLB.

Replace

the MPB.

Repair the faulty wiring

filter board.

from NT input to the EMI

Replace the

EMI filter board.

Repair the faulty wiring

to the left cooling fan.

from the EMI filter board

Repair the faulty

wiring from the MLB

relay K5 NO contact

to the left cooling fan.

Disconnect the connector on the left cooling fan.

contact to A C IN (NT )?

Is 120 VAC present from the MPB relay K5 NO

filter board IN2 contact?

relay K5 N O co nta ct to the E M I

Is 120 VAC present from the MPB

Enter the service mode.

Does the left cooling fan come on?

Left Cooling Fan Does Not Work

Yes

Is 120 VAC present from the MPB

– 55 –

Yes

filter board OUT2 contact?

relay K5 N O co nta ct to the E M I

K5 NO contact to the left cooling fan?

Is 120 VAC present from the MPB relay

Yes

of the left cooling fan?

Yes

contact to the negative contact

Is 120 VAC present from the positive

cooling fan.

Replace the left

Page 56

the EMI filter board.

Replace the one shot

wiring from L2 input to

TCO or repair the faulty

Yes

filter board.

Replace the EMI

contact to A C IN (N T)?

the EMI filter board IN3

Is 120 VA C pres ent from

Yes

Is 120 VA C pres ent from

Is 120 VAC present from

the EMI filter board OUT3

the MPB relay K1 COM

contact to AC IN (NT )?

Yes

contact to A C IN (N T)?

Yes

the MPB relay K1 COM

Repair the faulty wiring from

contact to the E M I filter board.

Replace

the MLB.

Yes

Replace

the MPB.

Repair the faulty wiring

filter board .

from NT input to the E M I

filter board.

Replace the EMI

Repair the faulty wiring

Repair the faulty

wiring from the MLB

to the right cooling fan.

from the E MI filter board

the right cooling fan.

relay K1 NO c onta c t to

Is 0 VDC pres ent from the MLB

connectors J3, pin 10 to J5, pin 2?

Disconnect the connector on the right cooling fan.

Is 120 VAC present from the MPB relay K1 NO

contact to A C IN (N T)?

filter board IN2 contact?

relay K1 NO co ntac t to the E M I

Is 120 VAC present from the MPB

Enter the service mode.

Does the right cooling fan come on?

Right Cooling Fan Does Not Work

Yes

– 56 –

Yes

filter board OUT2 contact?

relay K1 NO co ntac t to the E M I

Is 120 VAC present from the MPB

K1 NO co ntac t to the right c oo ling fan?

Is 120 VAC present from the MPB relay

Yes

of the right cooling fan?

Yes

contact to the negative contact

Is 120 VAC present from the positive

cooling fan.

Replace the right

Page 57

bad connection.

Check harness for

Correct and retest.

board). Disconnect ri ght

Note: Insure magnetron fan and stirrer motor

are operating properly . Failure of either of these

can lead to failure of high-voltage

component(s).

Check relay board (SWO

interlock connector. Check

J105 on board (yellow wire).

voltage from pin 1 of harness

side of connector (bl ack wire) to

Check microwave fuse.

page 24).

Check door sense switc h (see

Yes

Is there 240V at the t ransformer?

will be between pins 1 and 2 (black and yellow).

from magnetron to t ransformer mounting screw.

Check mag connector. Check grounds. Verify ground

(see page 24).

Ohm out right interl ock, left

interlock, and monitor switches

(see note).

Replace the

magnetron and retest

Check capacitor and wiring.

the connector).

Measure transformer primary resistance

(must read open in at least one direction).

Measure diode resistance in both directions

(1.1 +/- 0.2 ohms bet ween pins 1 and 3 of

will be higher.

(90 +/- 4 ohms between ground and single

Measure transformer s econdary resistance

wire capacitor). Note if HV T warm resistance

Check for 240V at transformer. Disconnect transformer 3-pin connector.

No Microwave Power

WARNING: High voltage system is at 4400V. Disconnect power and discharge capacitor before touching transformer , diode, cap acitor, magnetron

or any wiring between these components.

Power up microwave in service mode. Check voltage between pins 1 and 3

(black and purple) on harness s i de. Note: If voltage is l ess than 210, voltage

– 57 –

Page 58

the EMI filter board.

Replace the one-shot

wiring from L2 input to

TCO or repair the faulty

Yes

filter board.

Replace the EMI

contact to AC IN (NT)?

the EMI filter board IN3

Is 120 VAC present from

Yes

filter board.

Is 120 VAC present from

the EMI filter boa rd O UT 3

the MPB relay K5 COM

contact to AC IN (NT)?

Yes

contact to A C IN (NT )?

Yes

Repair the faulty wiring

Is 0 VDC present from the

from the MPB relay K5

J5, pin 2?

MLB connectors J3, pin 9 to

COM contact to the EMI

Replace

the MLB.

Yes

Replace

the MPB.

Repair the fau lty wiring

filter board.

from NT input to the EMI

filter board.

Replace t h e EMI

Repair the fau lty wiring

to the stirrer.

from the EMI filter board

to the stirrer.

Repair the fa u lty

wiring from the MLB

relay K5 NO contact

Enter the Service mode.

Does the stirrer motor come on?

Disconnect the connector on the stirrer.

Is 120 VAC present from the MPB relay

Stirrer Does Not Work

filter board IN2 contact?

K5 NO contact to AC IN (NT)?

relay K5 NO contact to the EMI

Is 120 VAC present from the MPB

Yes

filter board OUT2 contact?

relay K5 NO contact to the EMI

Is 120 VAC present from the MPB

Yes

Is 120 VAC present from the MPB

relay K5 NO contact to the stirrer?

Yes

Is 120 VAC present from the positive contact

Yes

Replace

to the negative contact of the stirrer?

the stirrer.

– 58 –

Page 59

the EMI filter board.

Replace the on e-s h o t

wiring from L2 input to

TCO or repair th e f au lty

Yes

filter board.

Replace the EMI

contact to AC IN (NT)?

the EMI filter board IN3

Is 120 VAC present from

Yes

contact to AC IN (NT)?

Is 120 VAC present from

the EMI filter board OUT3

the MPB relay K106 COM

Repair the faulty wiring from

contact to the EMI filter board.

Vent Fan Does Not Work

Replace

the MLB.

Yes

J5, pin 2?

contact to AC IN (NT)?

Is 120 VAC present from

the MPB relay K106 COM

Does the ven t fa n c o me on?

Enter the s er vic e mode and turn th e ve n t fan on .

contact to AC IN (NT)?

Disconnect the connector on the vent fan.

Is 120 VAC p res en t f rom the MPB rel ay K 1 06 NO

Is 0 VDC present from the

Yes

Is 120 VAC present from the MPB

Yes

MLB connec t ors J 3 , p in 3 t o

filter board IN2 contact?

relay K106 NO contact to the EMI

Repair the faulty wiring

Yes

Replace

the MPB.

filter board.

from NT input to the EMI

filter board O UT 2 co nt a ct ?

relay K106 NO contact to the EMI

Is 120 VAC present from the MPB

filter board.

Replace the EMI

Yes

to the vent fan.

Repair the faulty wiring

from the EMI filter board

K106 NO contact to the vent fan?

Is 120 VAC present from the MPB relay

Yes

the vent fan.

from the MLB relay

K106 NO c o nt ac t to

Repair the faulty wiring

Yes

to the negat ive co nt ac t of th e ven t fa n?

Is 120 VAC present from the positive contact

vent fan.

Replace the

– 59 –

Page 60

or L2 input.

Replace R2 or

repair the faulty

wiring from the L1

Replace

the MLB.

Repair the

and LORB.

faulty wiring

from the MLB

Is 240 VAC present from

the LORB relay K121 COM

Is -14.0 VDC present from

Replace

Yes

Replace

the LORB .

pin 7 to MLB J3, pin 2?

the LORB connectors J9,

the LORB.

Yes

contact to K14 COM?

Is -14.0 VDC present from

Replace

Yes

pin 7 to J5, pin 2?

the MLB connectors J4,

the MLB.

Yes

contact to K14 COM ?

Is 240 VAC p resent from

the LORB relay K121 COM

on the lower bake element.

Is the lower bake element on?

Lower Broiler Element Does Not Work

Enter the service mode and turn

Disconnect the lower bake

element. Is 240 VAC present

Yes

to K14 NO contacts?

from the LORB relay K121 COM

Is 4.6 VDC present from

the MLB connectors J4,

Is 240 VAC present at the

Replace the lower

Yes

lower bake element

pin 4 to J5, pin 2?

bake element.

connectors?

MLB to L O R B .

wiring from the

to MLB J5, pin 2?

LORB connec tors J9, pin 4

Is 4.6 VDC present from the

Repair the faulty wiring from the

LORB to the lower bake elem en t.

Repair the faulty

– 60 –

Page 61

Yes

the LORB connectors J9,

pin 7 to MLB J3, pin 2?

Replace

NoYes

wiring from the

Repair the faulty

MLB and LORB.

Replace

the LORB.

the MLB connectors J4,

pin 7 to J5, pin 2?

Replace

the MLB.

Replace

the MLB.

Yes

Is -14.0 VDC present from

the L1 or L2 input.

Replace R2 or repair

bake element.

Replace the lower

Repair the faulty wiring from the

LORB to the lower bake element.

Repair the faulty

Yes

NC contacts.

wiring from the LORB

relay K20 Com to K17

Yes

Is 240 VAC present from

contact to K14 COM?

the LORB relay K121 COM

the faulty wiring from

Yes

Is -14.0 VDC present from

at the lower bake

Is 240 VAC present

element connectors?

Yes

on the lower bake element.

Is the lower bake element on?

Lower Bake Element Does Not Work

Enter the service mode and turn

Disconnect the lower bake

from the LORB relay K121

element. Is 240 VAC present

Is 240 VAC

present from the

LORB relay K121

COM to K17 NO contacts?

Is 240 VAC present from

the LORB relay K121 COM

COM contact to

contact to K17 COM?

K14 NC?

Yes

– 61 –

Is 4.6 VDC present from

Is 240 VAC present from

the MLB connectors J4,

contact to K14 COM?

the LORB relay K121 COM

pin 5 to J5, pin 2?

Yes

Is -14.0 VDC present

J4, pin 4 to J5, pin 2?

from the MLB connectors

Replace

the MLB.

Yes

Is 4.6 VDC present from the

to MLB J5, pin 2?

LORB connectors J9, pin 5

Yes

Replace

Repair the faulty

the LORB.

wiring from the

Is -14.0 VDC present from

MLB to LORB.

pin 4 to MLB J5, pin 2?

the LORB connectors J9,

MLB to L O R B.

wiring from the

Repair the faulty

Page 62

NoYes

or L2 input.

Replace R2 or

repair the faulty

wiring from the L1

Replace

the MLB.

Repair the

and LORB.

faulty wiring

from the MLB

contact to K14 COM?

Is 240 VAC present from

the LORB relay K121 COM

contact to K14 COM?

Is 240 VAC present from

the LORB relay K121 COM

Is 240 VAC

COM contact to

present from the

LORB relay K121

Yes

Is -14.0 VDC present

J4, pin 4 to J5, pin 2?

from the MLB connectors

Yes

K14 NC?

Repair the faulty

wiring from the LORB

relay K20 Com to K17

pin 7 to J5, pin 2?

the MLB connectors J4,

Is -14.0 VDC present from

Replace

Yes

NC contacts.

Replace

Yes

the MLB.

pin 4 to MLB J5, pin 2?

the LORB connectors J9,

Is -14.0 VDC present from

the MLB.

pin 7 to MLB J3, pin 2?

the LORB connectors J9,

Is -14.0 VDC present from

Yes

Replace

the LORB.

Replace

the LORB.

No Yes

MLB to LORB.

wiring from the

Repair the faulty

Replace

the LORB.

to the lower convection element.

Repair the faulty wiring from the LORB

Replace the lower convection element.

Yes

lower

element

convection

Is 240 V A C

present at the

lower convection element.

Is the lower convection element on?

Lower Convection Element Does Not Work

Enter the service mode and turn on the

Disconnect the lower convection

Yes

element. Is 240 VAC present

from the LORB relay K121 COM

connectors?

to K20 NO contacts?

contact to K17 COM?

Is 240 VAC present from

the LORB relay K121 COM

Is 240 VAC

COM contact to

present from the

LORB relay K121

Yes

contact to K20 COM?

LORB relay K121 COM

Is 240 VAC present from the

Is -14.0 VDC present

J4, pin 5 to J5, pin 2?

from the MLB connectors

Yes

K17 NC?

Repair the faulty

wiring from the LORB

relay K20 Com to K17

connectors J4, pin 6 to J5, pin 2?

Is 4.6 VDC present from the MLB

Yes

NC contacts.

Replace

the MLB.

Yes

Is 4.2 VDC present from the MLB

Is -14.0 VDC present from

the LORB connectors J9,

connectors J4, pin 2 to J5, pin 2?

pin 5 to MLB J5, pin 2?

No Yes

MLB to LORB.

wiring from the

Repair the faulty

Replace

the MLB.

Yes

Repair the faulty wiring

from the MLB to LORB.

Yes

Is 4.6 VDC present from the LORB

connectors J9, pin 6 to MLB J3, pin 2?

Repair the faulty wiring

from the MLB to LORB.

Yes

LORB.

Is 4.2 VDC present from the LORB

connectors J9, pin 6 to MLB J3, pin 2?

Replace the

– 62 –

Page 63

– 63 –

Page 64

Repair the faulty wiring

from the LORB relay K16

filter board.

COM contact to the EMI

Repair the faulty wiring

EMI filter board.

from AC IN (NT) to the

Is 120 VAC present from

Yes

contact to AC IN (L1)?

the EMI filter board OUT2

contact to AC IN (L1)?

the LORB relay K16 COM

Yes

Is 120 VAC present from

Is 0 VDC present from

the EMI filter board IN2

the LORB connectors

contact to AC IN (L1)?

Yes No

J4, pin 10 to J5, pin 2?

Yes

filter board.

Replace the EMI

Replace

the MLB.

Replace

the LORB.

Replace the

plunger switch.

Are the lower lights on?

Enter the service m ode and

turn the lower oven lights on.

Lower Oven Light Does Not Work

Yes

Are the lower lights on?

Open the lower oven door.

Remove the halogen bulbs.

Is 120 VAC present from the LORB

lamp sockets.

EMI filter board.

from L1 input to the

Repair the faulty wiring

Yes

Is 120 VAC present from the

relay K16 NO contact to AC IN (L1)?

Yes

EMI filter board IN1 contact?

LORB relay K16 NO contact to the

Replace the EMI

Is 120 VAC present from the

filter board.

EMI filter board OUT1 contact?

LORB relay K16 NO contact to the

to the lamp sockets.

Repair the faulty wiring

from the EMI filter board

Yes

the halogen lamp sockets?

Is 120 VAC present from the

LORB relay K16 NO contact t o

from the LORB relay

K16 NO contact to the

Repair the faulty wiring

Yes

Is 120 VAC present from the positive

Yes

Replace the

halogen bulb.

halogen lamp sockets?

contact to the negative contact of the

– 64 –

Page 65

Is 120 VAC present from

Replace the

Yes

the positi ve to negative

Is 120 VAC present from

Yes

the LORB relay K15 NO

latch motor.

latch motor contacts?

OUT2 contact to the motor latch.

Replace the plunger switch or repair

the faulty wire from the EMI filter board

Replace the

EMI filter board.

board OUT2 contact?

contact to the EMI filter

Yes

Replace

the LORB.

No No

to MPB J5, pin 2?

board IN2 contact?

contact to the EMI filter

the LORB relay K15 NO

Is 120 VAC present from

Repair the faulty NT input wire to

Yes

Is the lower latch locked?

set the lower latch to lock.

Enter the service mode and

Is 120 VAC present from the LORB

relay K15 NO contact to AC IN (NT)?

Disconnect the latch motor connectors.

Is 0 VDC present from the

the EMI filter board IN2 contact.

Replace

Is 120 VAC present from the EMI filter

the MLB.

Yes

board OUT1 contact to AC IN (NT)?

Repair the faulty wire between

Yes

filter board.

Replace the EMI

board OUT 1 contact.

LORB K15 and the EMI filter

board IN1 contact to AC IN (NT)?

Is 120 VAC present from the EMI filter

IN1 contact.

LORB connectors J4, pin 13

Yes

K15 COM contact to AC IN (NT)?

Is 120 VAC present from the LORB relay

Lower Door Latch Does Not Work

– 65 –

Repair the faulty L1 input

wire to the EMI filter board

Page 66

Replace the plunger switch

or repair the faulty wiring to the

EMI filter board OUT 2 contact.

Replace

the LORB.

Is 120 VAC present from the

Yes

Replace the

convection fan.

of the convection fan?

from the LORB relay K122

NO or NC contact to contacts

Yes

Replace the

board OUT2 contact?

contact to the EMI filter

LORB relay K122 NO or NC

Yes

board IN2 contact?

contact to the EMI filter

LORB relay K122 NO or NC

Yes

EMI filter board.

Repair the faulty wiring from NT input

Yes

the MLB to the LORB.

Repair the faulty wiring from

Replace the MLB.

Yes

Is 0 VDC present from the LORB

Repair the faulty wiring from LORB

relay K18 NO to K122 COM contacts.

Yes

connectors J9, pin 11 to J5, pin 2?

Yes

COM to EMI filter board OUT1 contacts.

Replace the MLB. Replace the LORB.

Repair the faulty wiring from LORB relay K18

Yes

Replace the EMI filter board.

Yes

connectors J9, pin 12 to J5, pin 2?

Is 0 or 12 VDC present from the LORB

Yes

connectors J4, pin 12 to J5, pin 2?

Is 0 or 12 VDC present from the MLB

to the EMI filter board IN2 contact.

Yes

turn the convection fan on.

Enter the service mode and

Is the convection fan on?

contact to AC IN (NT)?

LORB relay K122 NO or NC

Is 120 VAC present from the

contact to AC IN (NT)?

LORB relay K122 COM

Lower Convection Fan Does Not Work

– 66 –

Is 120 VAC present from

contact to AC IN (NT)?

the LORB relay K18 NO

Is 120 VAC present from

contact to AC IN (NT)?

the LORB relay K18 COM

Is 120 VAC present from

contact to AC IN (NT)?

the EMI filter board OUT1

Is 120 VAC present from

contact to AC IN (NT)?

the EMI filter board IN1

Repair the faulty wiring from the L1

input to the EMI filter board IN1 contact.

Page 67

Replace the one shot

Is 120 VAC present from

TCO or repair the faulty

the EMI filter board IN3

the EMI filter board.

wiring from L2 input to

contact to AC IN (NT)?

Yes

filter board.

Replace the EMI

Yes

Is 120 VAC present from

the EMI filter board OUT3

the MPB relay K1 COM

contact to AC IN (NT)?

Yes

contact to AC IN (NT)?

Yes

Repair the faulty wiring from

Is 0 VDC present from t he MLB

the MPB relay K1 COM

contact to the EMI filter board.

Yes

connectors J3, pin 10 to J5, pin 2?

Replace

the MLB.

Replace

the MPB.

filter board.

wiring from NT

input to the EMI

Repair the faulty

filter board.

Replace the EMI

Repair the faulty wiring

from the EMI filter board

to the lower cooling fan.

Repair the faulty wiring

from the MLB relay K1

lower cooling fan.

NO contact to the

Disconnect the connector on t he lower cooling fan.

Is 120 VAC present from the MPB relay K1 NO

contact to AC IN (NT)?

filter board IN2 contact?

Yes

relay K1 NO contact to the EMI

Is 120 VAC present from the MPB

Enter the service mode.

Does the lower cooling fan come on?

Lower Cooling Fan Does Not Work

relay K1 NO contact to the EMI

Is 120 VAC present from the MPB

– 67 –

filter board OUT2 contact?

Yes

Is 120 VAC present from the MPB relay

K1 NO contact to the lower cooling fan?

Yes

Is 120 VAC present from the positive to

negative contact of the right cooling fan?

cooling fan.

Replace the lower

Page 68

Left Front Surface Element

NOTE:

Repair the faulty wiring from the L1

The H2 contact of the surface control cycles on and off t o

contact is energized when taking voltage measurements.

adjust the heat to the des i red setting. Make sure that the H2

or L2 input to the L1 or L2 contacts.

Replace the surface cont rol .

Left Rear Surface Element

Repair the faulty wiring from the surface

control H1 or H2 contact t o the element.

Right Rear Surface Element

Left Front, Left Rear, or Right Rear Element Does Not Work

Is the element on?

or right rear burner on.

Turn the left front, left rear,

Yes

Disconnect the element.

the L2 surface control c ontacts?

Is 240 VAC present from the L1 to

Yes

the H1 surface control c ontact?

Is 240 VAC present from the L2 to

Is 240 VAC present from the H1

Yes

to the H2 surface control contact?

Is 240 VAC present at the

Yes

element input contac ts?

Replace the element.

– 68 –

Page 69

Right Front Surface Element

NOTE:

The 2 contact of the surface control cycles on and off to

contact is energized when taking voltage measurements.

adjust the heat to the desired set ting. Make sure that the 2

Repair the faulty wiring from the L1

or L2 input to the L1 or L2 contacts .

Is the right front element on?

Turn the right front burner on.

Right Front Element Does Not Work

the P1 surface control c ontact?

Is 240 VAC present from the Si1 to

Disconnect the right f ront el ements.

Replace the surface control .

Yes

the P1 surface control c ontact?

Is 240 VAC present from the 4 to

Yes

Replace the surface control .

Yes

the P1 surface control c ontact?

Is 240 VAC present from the 4 to

– 69 –

Repair the faulty wiring from the

Replace the surface control .

Yes

the P1 surface control c ontact?

Is 240 VAC present from the 4 to

inner element to the surface control.

input contacts at t he i nner el ement?

Is 240 VAC present from the from the

Repair the faulty wiring from the

outer element to the surf ace control.

Yes

Replace the element.

input contacts at t he outer element?

Is 240 VAC present from the from the

Page 70

Schematics and Wiring Diagrams

Double Wall Oven (1 of 3))

WARNING: Disconnect electrical power before servicing. Caution: Label all wires prior to disconnection. Wiring errors can cause improper and dangerous operation. V erify

operation after servicing.

– 70 –

Page 71