e210120d02a

Jenn-Air

ElectricWall OvenService Manual

16009721Issued7/99

SAFETY PRECAUTIONSThis service information is intended to be used by a qualified service technician who is famil-iar with proper and safe procedures to be followed when repairing any electrical appliance.All tests and repairs should be performed by a qualified service technician who is equippedwith proper tools and measuring devices. All replacements should be made by a qualifiedservice technician using only Maytag Appliances Sales Company replacement parts.

Improper assembly or adjustment may occur if service or repair is attempted by personsother than qualified service technicians or if parts other than Maytag Appliances Sales Com-pany replacement parts are used. Improper assembly or adjustment can cause hazardousconditions.

There can be risk of injury or electrical shock while performing services or repairs. Injury orelectric shock can be serious or even fatal.

16009721 _:_metyO1999 Msytag Appliances Sales Company

INTRODUCTION

The manual is printed in a loose format and is divided into sections relating to a general groupof components and/or service procedures. Each section is further subdivided to describe aparticular component or service procedure.

The subdividing of the subject matter, plus the loose leaf form, will facilitate the updating ofthe manual as new or revised components are added or new models are introduced.

Each page of the manual will be identified in the lower, right-hand corner, and as new orrevised pages are published, the manual can easily be updated by following the filinginstructions on the cover letter of the supplement.

This service manual is a valuable tool and care should be taken to keep it up-to-date by promptand proper filing of subsequent pages as they are used.

MODELS COVERED IN THIS MANUAL:

W2451 WM27260W27100 WM27460W27200 WM30460W27400 JJW8527W30100 JJW8530W30400 JJW8627W3040OP JJW8630WW2460 JJW9527WW27110 JJW9530WW27210 JJW9627WW27430 JJW9630WW27430P JMW8527WW30110 JMW8530WW30430 JMW9527WW30430P JMW9530WM27160

16009721 Introduction i01999 Maytag Appliances Sales Company

NOTES

16009721 Introduction ii@1999 Maytag Appliances Sales Company

CONTENTSGENERAL SAFETY PRECAUTIONS ................................................................................................... iINTRODUCTION ................................................................................................................................. iiCONTENTS ........................................................................................................................................ iv

SECTION 1. COMPONENT DESCRIPTION ................................................................................... 1-1MEAT PROBE ......................................................................................................................... 1-1MEMBRANE SWITCH ........................................................................................................... 1-1ELECTRIC CONTROL ............................................................................................................. 1-1TOUCH SENSOR TECHNOLOGY ......................................................................................... 1-1DISPLAY BOARD ................................................................................................................... 1-1POWER RELAY BOARD ........................................................................................................ 1-1OVEN SENSOR ...................................................................................................................... 1-1FAULT CODES ........................................................................................................................ 1-2

SECTION 2. COMPONENT ACCESS .......................................................................................... 2-1CONTROL PANEL ASSEMBLY .................................................................................................. 2-1OVEN DOOR REMOVAL ............................................................................................................ 2-1SERVICING OVEN DOOR ........................................................................................................... 2-1OVEN DOOR-HINGE REPLACEMENT ...................................................................................... 2-2COOLING FAN ACCESS ............................................................................................................. 2-2OVEN CAVITY COMPONENTS .................................................................................................. 2-2

Oven Sensor Removal .......................................................................................................... 2-2Bake Element Removal ......................................................................................................... 2-2Broil Element Removal ......................................................................................................... 2-2Oven Light .............................................................................................................................. 2-3Convection Motor Assembly ............................................................................................... 2-3

OVEN VENT/SMOKE ELIMINATOR .......................................................................................... 2-3OVEN CAVITY ............................................................................................................................. 2-3OVEN HINGE POCKETS ............................................................................................................. 2-3

SECTION 3. TROUBLESHOOTING ............................................................................................. 3-1ELECTRONIC OVEN CONTROL: ............................................................................................... 3-1TROUBLESHOOTING ................................................................................................................. 3-5MULTIPLEXING CIRCUITRY ....................................................................................................... '3-8POWER RELAY BOARD CONNECTION ................................................................................... 3-9DISPLAY BOARD CONNECTIONS .......................................................................................... 3-10CIRCUIT BOARD CONNECTIONS ........................................................................................... 3-10MEMBRANE CONNECTIONS .................................................................................................. 3-11

SECTION 4. WIRING DIAGRAM ................................................................................................. 4-1W2451 .......................................................................................................................................... 4-IW27100 ........................................................................................................................................ 4-3W27200, W30100, WM27160, WM27260 .................................................................................. 4-4W27400, W30400, W30400P, WM27460, WM30460 ................................................................. 4-6WW2460 ....................................................................................................................................... 4-7WW27110, WW30110 ................................................................................................................. 4-8WW27210 ................................ _.................................................................................................... 4-9WW27430, W27430P, WW30430, WW30430P ........................................................................ 4-11

16009721 Contents iii1999 Maytag Appliances Sales Company

CONTENTS CONT.

JJW8527, JJW8530, JJW9527, JJW9530, ................................................................................. 4-13JMW8530, JMW8527, JMW9527, JMW9530 ............................................................................ 4-13JJW8627, JJW8630, JJW9627, JJW9630 .................................................................................. 4-15JJW8530, JJW9530 - Canadian Models .................................................................................... 4-17

16009721 Contents iv@1999 M0,/tag AppliancesSalesCompany

SECTION 1. COMPONENT DESCRIPTIONCOMPONENTS

Meat Probe: Senses the internal tempera-ture of products during a baking function.The meat probe is an NTC, or negativetemperature coefficient, which means theresistance value decreases as the tempera-ture increases. See meat probe chart belowfor resistance values.

MEAT PROBEType: Calibration:NTC Thermistor 9938 ohms (150F.)

PROBE RESISTANCE VS. TEMR TABLE

Degrees E Resistance122 18963 ohms

150 9938 ohms

156.2 8846 ohms

165.2 7456 ohms

210.1 3886 ohms

Membrane Switch: The means to make aswitch contact, thus instructing the elec-tronic control system to perform a desiredfunction. The membrane switch is a simpleset of two contact surfaces containingconductive material, one on the back layerof MYLAR and the other on the front layerof MYLAR. There is also a center section ofnon-conductive MYLAR material that has ahole punched out of it at each switch con-tact position. The thickness of this spacerMYLAR determines the push force requiredto close the contacts between the frontcontact strip and the rear contact strip.Typically, the push force required to close acontact is 12 to 18 ounces.

Electronic Control: A programmable soft-ware component that controls oven, clock,timer and various other functions. Thecontrol maintains oven temperatures ineither bake, broil, or clean. It is adjustable tomaintain correct temperature offsets. It isalso programmed with self-monitoringcircuitry, which determines if a potential

unsafe condition is present, shuts the sys-tem down and displays the appropriate faultcode. Fault codes are covered in productspecifications sections 3 and 4.

Touch Sensor Technology: With this newtechnology a positive charge and negativecharge is present around each pad. Thiscreates an electrostatic field that emanatesaround, below, and through the glass front.When the consumer touches a key pad, thisdisturbs the electrostatic field and drawscapacitance energy. This input is read bythe module, which in turn signals the con-troller to respond, and the desired functionis performed. In order for a function to beperformed, a conductive material mustbridge the gap between the negative chargepresent at each pad.

Display Board: Displays time-of-day clock,oven temperatures, and any other functionprogrammed into the electronic controlsystem. The display board also acts as theinput means from the membrane switchand sends those commands to the powerrelay board to process, implement, andmonitor.

Power Relay Board: Contains the intelli-gence in the electronic control system andcontrols all oven functions, clock, timer, ,andvarious other consumer programmableinputs. The PRB has a relay mounted to itfor each function it provides.

Oven Sensor: A device to monitor internaloven temperature. The sensor has a PTC orpositive temperature coefficient, or a resis-tance value that increases with temperature.Allows the electronic control to maintain atemperature setting through means ofresistance matching with the control-se-lected temperature. Example: The ovencontrol is set at 350F, the oven sensorresistance at room temperature is approxi-mately 1060 ohms. As the oven heats, the

16009721 COMPONENT DESCRIPTION 1-1_1999 Maytag Appliances Sales Company

resistance of the sensor increases. Theresistance of the sensor at 350F is approxi-mately 1654 ohms. The electronic controlmonitors the resistance value of the sensorand cycles the oven heating elements off.As the temperature in the oven decreases,the resistance of the sensor decreases. At apredetermined temperature setting, theelectronic control will initiate another heat-ing cycle in the oven elements. See ovensensor chart at right for resistance values.

OVEN SENSOR

Sensor Type: Calibration:RTD 1000 ohm platinum 1654 ohms (350E)OVEN SENSOR RESISTANCE VS. TEMP. TABLE

Degrees E Resistance100 1143 ohms

200 1350 ohms

300 1553 ohms

350 1654 ohms

400 1753 ohms

500 1949 ohms

600 2142 ohms

700 2331 ohms

800 "2516 ohms

900 2697 ohms1000 2874 ohms

FAULT CODES

There are built-in fault codes to assist the technician in diagnosis of the control system. Anytime the control senses an error in the system, the control will beep at s 1 second intervaluntil the ON/OFF key is pressed.

_u_CODES

F1

F3

F9

PROBLEM

Oven Temperature

Shorted Key, KeyboardDisconnected

Sensor Failure or SensorCircuit Failure

Door Code

COMPONENTS TO CHECK

Ohm Test Sensor. Check connection at Sensor WireHarness

Check control. If keyboard is not disconnected (F1-4) orkey is not shorted (F1-3), replace control.Ohm sensor. See chart,

Check Latch Assembly

For Models:WW27110, WW30110, WM27160 (Oven Sensor Chart: Please refer to chart on 1-3)

16009721 COMPONENT DESCRIPTION 1-2O199g Maytag Appliances Sales Company

FAULTPROBLEM COMPONENTS TO CHECKCODES

Power to element relay activated J1, J2 wire harness connection to control shorted. IfF1during time of day display, checks ok, change control.

F2 Over temperature sensed Ohm TEST SENSOR. If checks ok, change control.

F3 Open sensor. Ohm sensor.

F4 Shorted sensor. Ohm sensor.

F5 Over temperature Ohm sensor. Check connection of sensor wire harness.

F7 Shorted key Stuck Function Key on control.

F9 Door Code Check LatchAssembly.

For Models:W27100, W27200, W30100, WW27210, WM27260 (Oven Sensor Chart: Please refer to chart below)

MEAT PROBE:

TYPE:CALIBRATION:

NTC thermistor9938 ohms (150 F)

PROBE RESISTANCE VS TEMR TABLE

DEGREES F RESISTANCE122 18963 ohms150 9938156.2 8846165.2 7456210.1 3886

OVEN SENSOR:

SENSOR TYPE:CALIBRATION:

RTD 1000 ohm platinum1654 ohms (350 F)

OVEN SENSOR RESISTANCE VS TEMR TABLE

DEGREES F RESISTANCE100 1143 ohms200 1350300 1553350 1654400 1753500 1949600 2142700 2331800 2516900 26971000 2874

For Models:W27400, W30400, W30400RWW27430, WW27430RWW30430, WW30430RWM27460,WM30460, JJW8527, JJW85300 JJW86270 JJW8630, JJW9527, JJW9530, JJW9627, JJW9630,JMW8527, JMW8530, JMW9527, JMW9530

16009721 COMPONENT DESCRIPTION 1-31999 Maytag Appliances Sales Company

FAULTCODES PROBLEMS COMPONENTS TO CHECK

J2 harness shorted. If checks

POWER TO ELEMENT RELAY ENERGIZED ok, change (PRB) power relayF1 DURING TIME OF DAY DISPLAY. board. Note: For double oven

only, change second ovenboard.

Over temperature sensed; over 620F2 sensed by control in time of day mode, Ohm sensor. If checks ok,

bake mode, or over 950 sensed in clean change power relay board.mode. "See chart for sensor value."

F3 Cooling fan on with no oven function Ohm sensor, wire harness toselected, sensor.

F4 Shorted oven sensor Ohm sensor, wire harness tosensor,

F5 Power element relays disabled in cook 1) Intermittent sensor or wiremode. harness connection.

2) Intermittent contact on PRB.

F7 Shorted key sensed for 32 seconds 1) Membrane shorted2) Display Board

1) Probe jack or harness toF8 Shorted meat probe alarm, probe jack.

2) Probe sensing temp.Above 250 F. "See chart."

F9 Door lock safety circuit on power relayboard sensed. PRB

FF Invalid temp. Reading on PRB. Check sensor and harness,PRB.

J2 harness, ohm wires end toF- Communication error between boards, end. Harness ok, replace

display board.

FC Communication error between boards. J2 harness, ok, replace PRB.

DOUBLE OVEN ONLY

I F2 I Second oven error sensed,

1) Check sensor and harness.2) Replace second ovenboard.

16009721 COMPONENT DESCRIPTION 1-401999 Maytag Appliances Sales Company

SECTION 2. COMPONENT ACCESS

The following are instructions to access,repair and replace components of the slide-inrange.

The unit is more accessible if it is removedfrom the installed position before servicingprocedures begin.

-- IMPORTANT IDISCONNECT FROM POWER SOURCE [BEFORE SERVICING APPLIANCE. I

CONTROL PANEL ASSEMBLY

Electrical components can be accessed byremoving the control panel.

OVEN DOOR REMOVAL

.

,

.

To remove the control panel, open the oven 4.door as wide as possible. Remove the threescrews from the top of the control panel andthe three screws at the bottom of the con-trol panel. Grasp the control panel by 5.placing hands on the right and left sides ofthe panel, pull out and down to disengage.

For JJW Models:

1. To remove the control panel, open thedoor as wide as possible. Remove thefour screws from the bottom of thecontrol panel. Grasp the control panelby placing hands on the right and leftsides of the panel, lift up and out todisengage from upper flange.

2. Place the panel on the top oven rack(cover with a cloth to prevent scratch-ing) for component testing.

3. With the control panel pulled forward,access is now available to the followingcomponents: Control Assembly, Clock,High Limit Thermostat, Cooling Fan,Door Latch Mechanism and Motor.

Open the ovendoor as wide aspossible.

Place an 1/8"pin in the holeon the right andleft door hinges,see Figure 2-1,

Remove thescrews fromeach side with aPhiLlips screw-driver. Removethe lock platefrom each side, Figure 2-1

Raise the oven door up to a broil stopposition. In this position, it will beagainst the 1/8" pin.

Grasp the door toward the top on bothsides. Lift the door up and out to re-move.

SERVICING OVEN DOOR

1. Lay the oven door on a protected surfacewith the inner door panel facing down.

2. Remove three screws from lower trim.Remove trim piece.

3. Slide outer-door glass down to disen-gage from top trim. Remove.

4. Remove three screws from top ovendoor trim. Remove the two 3/8" nutsfrom the door handle bracket.

5. Lift up and off. This will disengage theside trim as well.

6. Remove the oven window pack by re-moving the 3/8" nuts from the insulationretainer.

16009721 COMPONENT ACCESS 2-11999 Maytag Appliances Sales Company

For JJW Models:

1. Lay oven door on a protected surfacewith the inner door panel facing down.

2. Remove the three screws at the top andthe three at the bottom of the door, seeFigure 2-2,

3. Grasp the door assembly at the bottomand lift the assembly off the front doorglass.

4. Remove the two center screws holdingthe center bracket in position.

Figure 2-2

5. Once the center bracket is removed youwill see two screws securing the trim tothe glass. Remove these screws.

6. Remove the two screws holding the leftand right side brackets inposition.

7. Slide the front door glass out of theframe.

8. Reverse the procedure to reassemble.

OVEN DOOR HINGE REPLACEMENT

1. Remove two screws from oven innerdoor panel that mount into the lowerportion of oven door hinge assembly.

2. Grasp and liftoven door hinge assemblyupward and slide down to disengageupper tabs from the door panel.

3. To reassemble the oven door, reverse theprocedures for disassembling.

COOLING FAN ACCESS

To access the cooling fan, remove two 1/4"hex screws from the bracket which the fan ismounted on. Tilt motor and bracket toallow it to pass through main back panel.

OVEN CAVITY COMPONENTS

Oven cavity components consist of: bakeand broil elements, oven light assembly,convection motor, oven cavity, and ovensensor,

Oven Sensor Removal

Remove two 1/4" hex screws, pull ovensensor into oven cavity to gain access to theelectrical quick connector.

To reassemble, use a probe and attach theprobe to the quick connector, Guide itthrough the insulation to ensure the connec-tor does not contact the oven cavity. Contactcould damage the connector.

Return to the original position, reattachingwith the 1/4" hex screws.

Bake Element Removal

Remove the two 1/4" screws. Pull the bakeelement into the oven cavity to accesselectrical wiring.

Broil Element Removal

Remove the four 1/4" hex screws. Pull broilelement into oven cavity to gain access tothe electric wiring. Reattach by returning tothe original position and fastening with fourhex screws.

16009721 COMPONENT ACCESS 2-21999 Maytag Appliances Sales Company

Oven Light

Bulb can be replaced or accessed by turningthe lens counterclockwise to remove theentire oven light. The socket can be removedby depressing the spring clips from the rearof the light socket end pushing it into theoven cavity.

A new oven light socket can be inserted andsnapped into position by depressing thespring clips and reattaching in the originalposition.

Convection Motor Assembly

To access the motor assembly, remove thethree 1/4" hex screws from the convectcover. Remove the cover. Remove threeadditional 1/4" hex screws that secure theconvect motor assembly. Pull convectmotor assembly into the oven cavity, dis-connecting the electricat quick-connect.

Reattach by returning to original positionusing reverse procedures.

OVEN VENT/SMOKE ELIMINATOR

, Remove oven vent and smoke eliminatorby using tabs on bottom of smoke elimi-nator, turning counterclockwise to disen-gage the locking ears from the innerinsulation retainer.

2. To remove the smoke eliminator, pulldown end align locking ears with notchesin oven cavity.

Reattach by reversing above procedures.

OVEN CAVITY

3. Grasp the front flange of the oven linerand gently pull forward to remove ovenliner from insulation and structure.

NOTE: When replacing oven cavity, usepieces of sheet metal on sides and top ofoven liner to allow cavity installationwithout tearing or removing insulation.

When the cavity is within two inches ofbeing in place, remove the sheet metal.

OVEN HINGE POCKETS

,

.

Remove oven door following the stepspreviously described in section on OvenDoor Removal.

Remove hex screws from the lower frontclosure.

3. From each side of the range, remove two1/4" hex screws.

4. Replace components and reassemble.

.

.

All internal oven cavity componentsmust be removed prior to oven cavityremoval.

Remove the five 1/4" hex screws fromthe front flange of the oven liner. (Threescrews will be on the top and two on thebottom.)

16009721 COMPONENT ACCESS 2-3@1999 Maytag Appliances Sales Company

160(;9721 COMPONENTACCESS 2-401999 Maytag Appliances Sales Company

SECTION 3. TROUBLESHOOTINGTest Access The test mode can be accessed by holding the stop time key down at

power up or by holding the stop time key down for 10 seconds within 5minutes of power up mode, No other key can be pressed before thestop time key, that would block the test mode access.

Test Exit Exit the test mode by pushing the cancel key or test will self-terminateafter 16 seconds from the last key command chosen.

Test Function Test mode is perfomed by pushing a keypad and testing for an outputresponse. When the keypad is released, the output is terminated andthe display will return to the "-" display. The following is a list of keyactions and responses.

NOTE:1. Each time a key is pressed a tone will sound.2. If there is a red dot on the IC-chip and the display board when you touch the oven light key,

the oven light will come on and a beep will occur. The beep is to let you know that there isa good circuit, in case the light is blown. Also, when you press the fan speed key on a dualspeed downdraft, it will beep each time you touch the key. The first beep will be the highsetting, the second beep will be the low setting, and the third beep will be off.

Bake Key

Broil Key

Convect Bake Key

Convect Roast Key

Oven Light Key

Probe Key

Timer Keys

Clean Key

Activates bake relay on the power relay board.

Activates broil relay on the power relay board.

Activates convect bake relay (CVBAK) on the power relay board.

Activates convect roast relay (CVRST) on the power relay board.

Activates oven light (OVLT) relay on the power relay board. (See note2 above.)Activates the display on the control to display the probe temperature.

Activates the display to show factory codes in the blue displayed digitsand oven temperature in red.

Activates blue display digits which shows the state of the door lockswitches and the status of the user selectable options. See charts onpage 1-2. NOTE: First (left) blue displayed digit is for user selectable

options code and the fourth (right) blue digit is for the door lock switchstatus code.

16009721 TROUBLESHOOTING 3-1O1999 Maytag Appliances Sales Company

Stop Time Key Will activate the beeper 100% as long as the key is pressed. Also, it willdisplay the control I.D. # in the blue time digits and the power relayboard I.D. # in the red temperature digits.

Clock Key Activates all display segments to light.

Cook Time Key Activates any fault codes stored in the memory. The time digits displayany fault codes for the membrane and control board. The temperaturedigits display any fault codes for the power relay board. NOTE: If"FO"is disDlaved, there has not been any fault codes sensed in that portionof the svstem. Any stored fault code can be cleared to FO, after repairshave been made, by entering the fast test and pressing both the cooktime and stop time keys for 5 seconds.

Digital Input Keys Activates the display to show the same digit (0-9) that is pressed.Temperature Program bake above 500 , repress bake pad and hold for 3-4 seconds,Offset Change the pad must be re-pushed within 3 seconds. The digital keys can be

used to set the offset between positive and negative(-). Entered valuesare rounded to the next 5 increment. (Example: pushing key 3 willdisplay a 5 increment).

Clock andTemperatureChange

The clock can be set to be displayed in 24 hour form. Also,temperature can be displayed in degree "C". To access, hold eithertimer keys down on power up. The two left digits will display theformat for the clock, the right digit will display "F" or "C." The displaycan be toggled by pushing the bake or upper bake key to toggle theclock. The temperature display can be toggled from F to C by pushingthe broil key or upper broil key on a double oven control.


DisplayCode

F

E

D

CB

A

9

8

7

6

5

4

3

2

1

0

User Selectable Options Display Codes

Deg. C

X

X

X

X

X

X

X

X

24 HourClock

X

X

X

X

X

X

x

X

ContinuousEOC

X

X

X

X

x

XXx

60 HzReference

X

X

X

X

X

X

X

X

Display Code

7

6

5

4

3

2

1

0

Door Lock Switch CodesUnlocked Locked

Switch Switchclosed closed

open closed

closed open

open openclosed closed

open closed

closed open

open open

Door ClosedSwitchclosed

closed

closed

open

open

open

open

open

16009721 TROUBLESHOOTING 3-3@1999 Maytag Appliances Sales Company

Fault Code Problem Components to Check

F1 Power to element relay energized J2 harness shorted; If checks ok,during time of day display, change (PRB) power relay board.

NOTE: For double oven only, changesecond oven board.

F2 Over temperature sensed; over 620 Ohm SENSOR. If checks ok, changesensed by control in time of day mode, )ower relay board.bake mode, or over 950 sensed in "See chart for sensor value."clean mode.

F3 Cooling fan on with no oven function Ohm SENSOR, wire harness to sensor.selected.

F4 Shorted oven sensor Ohm sensor, wire harness to sensor.

F5 Power to element relays disabled in 1) Intermittent sensor or wire harnesscook mode. connection.

2) Intermittent contact on PRB.F7 Shorted key sensed for 32 seconds. 1) Membrane shorted..

2) Display board.F8 Shorted meat probe alarm. 1) Probe jack or harness to probe jack.F9 Door lock safety circuit on power relay PRB.

board.

FF Invalid temperature reading on PRB. Check sensor and harness, PRB.F- Communication error between boards. 1) J2 harness, ohm wires end to end.

Harness ok, replace display board.

FC Communication error between boards. J2 harness, ok, replace PRB.

Double Oven Only

FR Second oven error sensed. 1) Check sensor and harness.2) Replace second oven board,

MEAT PROBE

Type: Calibration:NTC Thermistor 9938 ohms (150R)

PROBE RESISTANCE VS. TEMR TABLE

Degrees E Resistance

122 18963 ohms

150 9938 ohms

156.2 8846 ohms

165.2 7456 ohms

210,1 3886 ohms


TROUBLESHOOTING

Power Board Voltage Resistance Ref. Point Comments

J1-1 0.0 Vdc J1-1 Signal GroundJ1-2 13.0 Vdc J1-1 +12 Vdc Source

J1-3 21.2 VAC J1-4 T1 SecondaryJ2-1 5.0 Vdc J1-1

J2-1 0.0 Vdc J1-1 Press Cancel 2

J2-2 5.0 Vdc J1-1

J2-2 0.0 Vdc J1-1 Press Cancel 1

J2-3 0,0 Vdc J1-1 Time of Day Mode

J2-3 2,8 Vdc J1-1 Cooking Mode Active Oven 1J2-4 0.0 Vdc J1-1 Time of Day Mode

J2-4 2.8 Vdc J1-1 Cooking Mode Active Oven 2J2-5 1.2 VAC J1-1 Serial Clock LineJ2-6 1.3 VAC J1-1 Transmit Line

J2-7 2.5 VAC J1-1 Receive Line

J2-8 Enable Line

J3-1 5.0 Vdc J1-1 Probe OutJ3-1

Power Board

J7-4

J7-5

J7-5

J7-6

J7-7

J7-7

J7-8

J8-1

J8-2

J8-2

J8-3J8-3

J8-4

J8-5

J8-5J9-1

J9-2

J9-3

J10-1J10-2

J10-3

Voltage2.8 Vdc

0.0 Vdc

2.3 VAC

1.2

0.0 Vdc

2.8 Vdc

0.0 Vdc12.0 Vdc

12.0 Vdc

0.0 Vdc0.0 Vdc

12.0 Vdc

12.0 Vdc

0.0 Vdc1.9 Vdc

Resistance Ref. PointJ1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1J1-1

J1-1

J1-1J1-1

Control HeadJ1-1

J1-2

J1-3

J2-1

J2-1

J2-2

J2-2

J2-3

J2-3

J2-4

J2-4

J2-5

J2-6

J2-7

J2-8

Voltage0.0 Vdc

13.0

21.2 VAC

5.0 Vdc

0.0 Vdc

5.0 Vdc

0.0 Vdc

0.0 Vdc

2.8 Vdc

0.0 Vdc

2.8 Vdc1.2 VAC

,1.3 VAC2.5 VAC

Resistance Ref. Point

J1-1

J1-1

J1-4

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

J1-1

Comments

Signal Ground+12 Vdc Source

T1 Secondary

Press Cancel 2

Press Cancel 1

Time-0f-Day Mode

Cooking Mode Active Oven 1

Time-of-Day Mode

Cooking Mode Active Oven 2Serial Clock Line

Transmit Line

Receive Line

Enable Line

2nd Oven Voltage Resistance Ref. Point Comments

J7-1 Enable Line

J7-2 Open PinJ7-3 2.5 VAC J1-1 Receive Line

J7-4 2.8 Vdc J1-1 Door Lock Limit

J7-5 0.0 Vdc J1-1 Time of Day Mode

J7-5 2.3 VAC J1-1 Cooking Mode Active O_en 2J7-6 1.2 VAC J1-1 Serial Clock Line

J7-7 0.0 Vdc J1-1 Time-of-Day Mode

J7-7 2.8 Vdc J1-1 Cooking Mode Active Oven 2

J7-8 0.0 Vdc J1-1 Signal Ground


MULTIPLEXING CIRCUITRY-WALL OVENS

TSTImm| I DISPLAY ._

OVENPOWERBOARD

(DOUBLEOVEN ONLY)

J1

MAINPOWER BOARD

J9E-_L

VCC REFERENCE -_

KEY M

DOOR

LOCK ,b

UNLOCK m

VCC REFERENCE -.'

DOOR M

LOCK

KEY ,a,

UNLOCK m

i OVEN

SENSOR

!r

LOWEROVENSENSOR

16009721 TROUBLESHOOTING 3-81999 Maytag Appliances Sales Company

POWER RELAY BOARD CONNECTIONS

TO L1

N

NEU'm_

NTOOVEN

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16009721 01999 Maytag Appliances Sales Company TROUBLESHOOTING 3-9

DISPLAY BOARD CONNECTIONS

TO POWERRELAY JBOARD J1

DISPLAY BOARD

J2

TO POWERRELAYBOARO J2

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MEMBRANESWITCH TAIL

CIRCUIT BOARD CONNECTIONS

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160G9721 TROUBLESHOOTING 3-10@1999 Maytag Appliances Sales Company

MEMBRANE CONNECTIONS

PAD1234557890

LO BAKELO BROIL

LO CLEANTIMER ONESTOP TIME

CLOCKPROBE

OVEN LIGHTTIMER TWOCOOK TIM E

UPPER BAKEUPPER BROIL

UPPER CLEANUPPER CONVECTION BAKE

UPPER CONVECTION ROASTUPPER CANCELLOWER CANCEL

Membrane Switch: The means to make aswitch contact, instructing the electroniccontrol system to perform a desired function.The membrane switch is a simple set of twocontact surfaces containing conductivematerial, one on the back layer of MYLARand the other on the front layer of MYLAR.There is also a center section of non-conduc-

CIRCUIT15to 414to 413to412to411to410to 49to48to 47to 46to4

15 to 1614 to 1613 to 1614to 513to512to 511to510to59to 58to5

10to39to 38to 37to36to31 to2

1 to 17

tive MYLAR material that has a holepunched out of it at each switch contactposition. The thickness of the MYLARspacer determines the push force requiredto close the contacts between the frontcontact strip and the rear contact strip.Typically, the push force required to close acontact is 12 to 18 ounces.


TO L1

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POWER RELAY BOARD-DOUBLE WALL OVEN

N

TOTO UPPERDISPLAY OOORBOARD LOCI

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