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

...

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

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

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.

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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.

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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.

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+ 53 hidden pages

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

Specifications and Main Features

Frequently Asked Questions

User Manual