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GE Monogram ZEK938, Technical Service Manual, Page: 47 / 66

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GE Monogram ZEK938 Technical Service Manual Download Page 47

– 47 –

Electronic Oven Control

Overview

The Electronic Oven Control (EOC) system consists of the control, key panel, oven sensor, and door lock 
assembly.

Caution:

 Components are electrically HOT on the control when voltage is connected to the range.

Note:

 Voltage must be present across terminals L1 and N for the control to operate.

Note: 

Temperature/Mode Selection is necessary for the operation of the relay contacts.

Bake, broil, and convection units cannot be on at the same time.

• 

Bake, broil, and convection units operate sequentially during preheat. the broil unit is on approximately 

• 

25% of the bake time during the balance of the bake operation. There is approximately 1 minute of off 
time between bake and broil unit operation after the preheat.

In the clean cycle, the broil unit is only on during 

fi

 rst the 30 minutes or until the oven reaches 750°F. 

• 

During the balance of the clean operation, the oven will cycle between the bake and broil units, with 1  
second of off time while calling for heat.

Oven Circuits

NORMALLY

OPEN

NORMALLY

CLOSED

NORMALLY

CLOSED

SPDT

SPST

SPST

SPDT

NORMALLY

OPEN

NORMALLY

OPEN

L2

L1

NORMALLY

OPEN

BAKE

HEATER

BROIL

HEATER

CONVECTION

HEATER

SPDT

SPST

NORMALLY

CLOSED

SPDT

L2

N

L1

NORMALLY

OPEN

NORMALLY

OPEN

NORMALLY

OPEN

NORMALLY

CLOSED

NORMALLY

CLOSED

THROUGH 2.2 OHM FLAMEPROOF

REGISTER TO

BAKE

HEATER

BROIL

HEATER

Oven equipped with convection unit

Oven without convection unit

Summary of Contents for Monogram ZEK938

Page 1: ...es General Electric Company Louisville Kentucky 40225 31 9163 27 in Built In Wall Ovens JKS10 JKP30 JKP35 JKP55 JKP70 JKP75 JKP90 PK916 PK956 ZEK938 ZEK958 Technical Service Guide June 2008 GE Consumer Industrial ...

Page 2: ... 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 an...

Page 3: ...formation 50 Door Assembly 29 Door Hinge Receivers 44 Electronic Oven Control EOC 47 Error Codes 55 Introduction 04 Key Panel Test 52 Lock Assembly 39 Meat Probe and Outlet 45 Nomenclature 05 Operational Notes 24 Oven Component Access Chart 28 Oven Components 29 Oven Light Assembly 46 Oven Removal 32 Oven Separation JKP90 Only 33 Oven Sensor and Door Switch Test 54 Oven Temperature Sensor 34 Sales...

Page 4: ...ection Bake Multi Rack Provides ideal convection baking for multiple racks of food ensuring superb results Convection Roast Provides even cooking and consistent results roasting meats up to 25 faster than a conventional oven Glass Touch Oven Controls Feature a smooth glass design that is both easy to operate and easy to clean Self Clean Oven Conveniently cleans oven cavity without the need for scr...

Page 5: ...ndicator for Engineering and Product Service Only Model Year Designator J K P 5 5 S M 1 S S Nomenclature Nomenclature The letter designating the year repeats every 12 years Example T 1974 T 1986 T 1998 Model Number Single Wall Oven Glass Color S Integrated Stainless GE Configuration only P Self Clean Oven S Standard Oven Serial Number The first two characters of the serial number identify the mont...

Page 6: ...urs and 59 minutes 16 NUMBER PADS Use to set any function requiring numbers for example the time of day on the clock the timer the oven temperature the internal food temperature the starting and length of cooking time for Timed Bake and the starting and length of cleaning time for Self Clean 17 CLOCK Press to enter the time of day If F and a number or letter flash in the display and the oven contr...

Page 7: ...Press to select self cleaning function See the Using the self cleaning oven section Oven Light On Off Pad Press to turn the oven light on or off Delay Start Pad Use along with Cooking Time or Self Clean Std Low pads to set the oven to start and stop automatically at a time you set Cooking Time Pad Press and then press the number pads to set the amount of time you want your food to cook The oven wi...

Page 8: ...sh in the display when there has been a power outage Self Clean Pad Press to select self cleaning function See the Using the self cleaning oven section Oven Light On Off Pad Press to turn the oven light on or off Delay Start Pad Use along with Cooking Time or Self Clean pads to set the oven to start and stop automatically at a time you set Cooking Time Pad Press and then press the number pads to s...

Page 9: ...ight on or off Delay Start Pad Use along with Cooking Time or Self Clean pads to set the oven to start and stop automatically at a time you set Cooking Time Pad Press this pad and then press the Hour and Min and pads to set the amount of time you want your food to cook The oven will shut off automatically when the cooking time has run out unless the Cook and Hold feature was set Clear Off Pad Pres...

Page 10: ...y when the there has been a power outage Broil Hi Lo Pad Press to select the broil function Bake Pad Press to select the bake function Self Clean Pad Press to select the self cleaning function See the Using the self cleaning lower oven section Oven Light Pad Press to turn the oven light on or off Number Pads Use to set any function requiring numbers such as the time of day on the clock the timer t...

Page 11: ... food cake A A or B Bundt or pound cakes A A or B Biscuits muffins B or C C or D brownies cookies cupcakes layer cakes pies Casseroles B or C C or D How to Set the Oven for Broiling Close the door Always broil with the door closed Place the meat or fish on a broiler grid in a broiler pan Follow suggested rack positions in the Broiling Guide The size weight thickness starting temperature and your p...

Page 12: ... pad After pressing the Start pad SET disappears this tells you the time is counting down although the display does not change until one minute has passed Seconds will not be shown in the display until the last minute is counting down When the timer reaches 00 the control will beep 3 times followed by one beep every 6 seconds until the Kitchen Timer On Off pad is pressed The 6 second tone can be c...

Page 13: ...re probe takes the guesswork out of roasting by cooking foods to the exact doneness you want NOTE Double oven models have a probe in the upper oven only Use of probes other than the one provided with this product may result in damage to the probe Use the handles of the probe and plug when inserting and removing them from the meat and outlet To avoid damaging your probe do not use tongs to pull on ...

Page 14: ... meat reaches the number you have set the probe and the oven turn off and the oven control signals To stop the signal press the Clear Off pad Use hot pads to remove the probe from the food Do not use tongs to pull on it they might damage it CAUTION To prevent possible burns do not unplug the probe from the oven outlet until the oven has cooled Do not store the probe in the oven NOTE If the probe i...

Page 15: ...erall result is time saved Cookies muffins biscuits and other quickbreads give very good results with multi rack baking For 30 Ovens When baking on 3 racks place one rack in the second B position one in the fourth D position and one in the sixth F position For two rack baking place one rack in the second B rack position Place the other rack in the fourth D rack position For 27 Ovens When baking on...

Page 16: ...m 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 The fan will stop when the door is opened but the heat will not turn off NOTE Foods that spoil easily such as milk eggs fish stuffings poultry and pork should not b...

Page 17: ...e oven temperature The oven temperature can be adjusted up to 35 F hotter or 35 F cooler On models with number pads press them the same way you read them For example to change the oven temperature 15 F press 1 and 5 On models with Temp and pads press them to increase or decrease the temperature in 1 degree increments When you have made the adjustment press the Start pad to go back to the time of d...

Page 18: ...ce cooking utensils or any other items on the oven floor There is a heating element beneath the oven floor Placing items on the oven floor may cause the oven to overheat resulting in damage to the oven and risk of damage or fire to cabinets Wipe up heavy soil on the oven bottom appearance may vary How to Set the Oven for Cleaning Press the Self Clean pad once for a 4 hour clean time or twice for a...

Page 19: ... for the lower oven Fahrenheit or Celsius Temperature Selection Your oven control is set to use the Fahrenheit temperature selections but you may change this to use the Celsius selections Press the Bake and Broil Hi Lo pads on double oven models use the upper oven controls at the same time for 3 seconds until the display shows SF Press the Broil Hi Lo and Cooking Time pads at the same time The dis...

Page 20: ...Press the Oven Light On Off pad again The display will show 1 BEEP This is the quietest volume level For each time the level is changed a tone will sound to provide an indication of the volume level Choose the desired sound level 1 BEEP 2 BEEP 3 BEEP Press the Start pad to activate the desired level shown NOTE On double oven models this activates this special feature for both ovens On models with ...

Page 21: ...cooking times only regular baking temperatures To activate the feature Press the Bake and Broil Hi Lo pads on double oven models use the upper oven controls at the same time for 3 seconds until the display shows SF Press the Convection Bake pad The display will show CON OFF Press the Convection Bake pad again The display will show CON ON Press the Start pad To deactivate the feature repeat steps 1...

Page 22: ...OTE If bake or broil appears in the display the Bake and Broil Hi Lo pads were not touched at the same time Touch the Clear Off pad and begin again Tap the Delay Start pad until SAb bAtH appears in the display Touch the Start pad and will appear in the display Touch the Cooking Time pad Touch the number pads to set the desired length of cooking time between 1 minute and 9 hours and 99 minutes The ...

Page 23: ... the oven Melted plastic may not be removable and is not covered under your warranty How to Set the Oven for Warming The proofing feature maintains a warm environment useful for rising yeast leavened products 1 Place the covered dough in a dish in the oven on rack B or C NOTE For best results cover the dough with a cloth or with greased plastic wrap the plastic may need to be anchored underneath t...

Page 24: ...f the temperature probe is plugged in When using the probe you can use the timer but you cannot use timed oven operations On the double wall oven the oven control will automatically set the oven that has the probe plugged into it In Convection Bake the bake element and the fan operate whenever the oven is heating Convection Broil will not work if the temperature probe is plugged in Never leave the...

Page 25: ...inued next page Oven Door Broil Element Oven Door Gasket Light Broil Element Oven Door Gasket Oven Door Meat Probe Outlet Control Panel Convection Fan Hidden Bake Element Hidden Bake Element Light Door Lock Door Lock Oven Temperature Sensor Oven Temperature Sensor ...

Page 26: ...ven Double Oven Shown Continued next page Cooling Fan Capacitor Auxiliary Control Board Door Lock Thermal Switch Metal Air Divider Metal Air Divider Door Lock Assembly and Thermal Switches Double Oven Shown Electronic Oven Control EOC ...

Page 27: ... 27 Back of Oven Double Oven Shown All Rear Covers Shown Removed Thermal Line Break Thermal Cutout TCO Thermal Line Break Thermal Cutout TCO Cooling Fan Convection Fan Bake Element Bake Element ...

Page 28: ...vection Fan Blade z z z Convection Fan Capacitor z z z Convection Fan Motor z z z Control Panel Assembly z z n a z z Cooling Fan z z z Cooling Fan z z z Door Assembly z z z z z Door Hinge Receiver z z z z z Electronic Oven Control z z z z z FAD 2 each oven z z z z z Lock Assembly z z z z z Meat Probe Outlet z z z z z Oven Light Assembly z z z z z Oven Temperature Sensor z z z z z Thermal Line Brea...

Page 29: ... To replace the door With the door at the same angle as the removal 1 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 Firmly grasp both sides of the door at the top 2 Close the door to the door removal position 3 then lift it up and out Oven Components Continued next page Open the door...

Page 30: ...s can damage the handle Hand tighten the screws and make sure the handle fits snugly to the door panel Do not use an electric driver To replace the inner door assembly Remove the outer door assembly See 1 Door Assembly Continued next page To remove the outer door assembly Remove the door 1 Place the inner door assembly gasket side up 2 on a protective surface Remove the three T 15 Torx screws from...

Page 31: ...in the top of the door DO NOT INSULATE THIS AIR CHANNEL Arrows on the side of the inner glass assembly indicate the direction in which the inner oven door glass is installed The arrows should be pointing toward the oven cavity Door Gasket The gasket forms a complete seal around the front edge of the oven liner and the inner door panel The door gasket is attached to the inner door panel by spring c...

Page 32: ... a table or platform in front of the oven and pull the oven completely out Note When reinserting the oven into cabinet opening ensure that the conduit is properly positioned behind the oven See the Installation Instructions manual Side Access Panels To remove side access panels on each side 1 Remove the in hex head screws that hold each side trim in place The single wall oven has 4 hex head screws...

Page 33: ...s and the black metal trim from the bottom of the microwave trim 3 Open the microwave door 4 Remove two T 15 Torx screws and the microwave trim from the oven 5 Close the microwave door 6 Remove the oven from the installation See Oven Removal 10 Remove the microwave by sliding it out 7 Remove two in hex head screws from the microwave support rails 8 Lift up slightly on the bottom of the microwave a...

Page 34: ...o push and guide the sensor wire harness into the oven liner Broil Element Note The resistance of this component can be tested from the EOC See Control Board Testing The broil element will not work if the temperature probe is plugged in The element is rated at 3400 watts has an approximate resistance value of 17 Ω and draws approximately 14 5 amps The broil element is located on the back wall of t...

Page 35: ...he broiler element to the oven rack 3 Remove the two in hex head screws that hold the vent tube to the top of the oven cavity Do not remove the remaining hex head screws 4 Remove the vent tube from the oven cavity Broil Element Vent Tube Convection Fan Blade The convection fan blade is located on the back wall of the oven cavity and is removed separately from the convection fan motor To remove the...

Page 36: ...il the element terminals are accessible 5 Disconnect the wires from the convection bake element Convection Bake Element Control Compartment Access Note It may be necessary to partially remove the oven from the installation to avoid damage to the customer s woodwork See Oven Removal To access the control compartment on single or double ovens Open the oven door 1 Remove the three in hex head screws ...

Page 37: ...ion Note There are three tabs on the right side of the control panel assembly Push the control panel to the left to free it from the housing Control Panel Assembly The control panel assembly consists of the control panel frame the electronic oven control and the key panel Note The GE Profile and Monogram series control panels are slightly different Verify the model number of the unit before making...

Page 38: ...ogram series control panel 1 Disconnect and remove the ribbon cable from the electronic oven control and the key panel 2 Remove four in hex head screws that hold the electronic oven control to the control panel frame 5 Pull the membrane panel from the key panel 3 Remove 2 Phillips head screws from the the control panel frame 4 Press in the tabs and remove the key panel from the control panel frame...

Page 39: ...n The word LOCKED will flash on and off in the display while the lock motor is in motion When the door is locked the word LOCKED remains Door Locking Unlocking Strip Circuit The cam on the motor performs two functions Positions the lock hook in the door to prevent 1 opening during the cleaning operation Operates the lock switches which tell the 2 control if the door is unlocked or locked and ready...

Page 40: ...econnect the switch wiring incorrectly to the lock assembly When reconnecting the wiring make sure it is properly connected to the lock assembly before turning the power back on O Y Y Y BU BU UNLOCKED LOCK SW UNLOCK SW 1 2 3 4 5 6 HIGH TEMP THERMAL SW LOW TEMP THERMAL SW Hold the control panel and open the oven door 5 Place the control panel on the protected oven 6 door as shown Auxiliary Control ...

Page 41: ...witch This limit switch opens at 194 F and closes when the temperature cools below 158 F This switch is active only in non self clean operations unlock switch closed lock switch open The higher temperature thermal switch is wired in series with the common of the lock unlock switch This limit switch opens at 216 F and closes when the temperature cools below 177 F This switch is active only in self ...

Page 42: ...has an approximate resistance value of 27 Ω and draws approximately 9 9 amps The bake element is located under the oven floor Bake element terminals are located behind the rear access panels on both the single and double wall ovens To remove a bake element Remove the oven from the installation then 1 remove the left side access panel for the appropriate bake element See Oven Removal Carefully lift...

Page 43: ...ing fan requires the oven to be removed To remove the cooling fan in the single and upper oven Access the control compartment See 1 Control Compartment Access Disconnect the cooling fan wire harness 2 Remove the four in hex head screws 2 3 on each side that hold the cooling fan to the control compartment To remove the cooling fan in the lower oven Remove the oven from the installation and 1 remove...

Page 44: ...oling fan from the oven Cooling Fan Cover Cooling Fan Disconnect Thermal Line Break Thermal Cutout TCO A self resetting disc type thermal cutout switch is attached to the rear of the oven The switch will open the L2 leg of the power to the heating elements in the event of an over temperature condition The switch on the upper oven will open when the panel it is attached to reaches approximately 302...

Page 45: ...e the convection fan motor assembly Remove the convection fan blade See 1 Convection Fan Blade Remove the oven from the installation and 2 remove the rear covers See Oven Removal Convection Airflow Disconnect the convection fan motor wire 3 harness Remove the three in hex head screws that 4 hold the convection fan motor to the back of the oven Disconnect Meat Probe and Outlet If equipped the meat ...

Page 46: ...o the control compartment See 1 Control Compartment Access Disconnect the wire harness from J9 on the EOC 2 To remove an oven light assembly on lower ovens and JKP90 1 On JKP90 remove the microwave trim from the microwave See Oven Separation 2 Open the lower oven door 3 Remove 4 Phillips head screws and the door lock assembly cover plate from the oven Open the oven door and place the control panel...

Page 47: ...ng the balance of the bake operation There is approximately 1 minute of off time between bake and broil unit operation after the preheat In the clean cycle the broil unit is only on during first the 30 minutes or until the oven reaches 750 F During the balance of the clean operation the oven will cycle between the bake and broil units with 1 second of off time while calling for heat Oven Circuits ...

Page 48: ... Light RY655 Convection Fan RY500 Broil Element RY501 Bake Element RY502 Convection Element CN2 Meat Probe Door Switch Relay Thermal Switch Oven Sensor L1 L1 Power to EOC CCW Convection Fan CW Convection Fan N Neutral to EOC FOD Cooling Fan OL Oven Light CN2 RY660 CW L1 CCW N FOD OL RY501 RY502 RY500 RY620 RY540 RY630 RY650 RY655 ...

Page 49: ...y Panel J3 Upper Door Lock Motor Switch Temperature Sensor and Meat Probe J4 Lower Door Lock Motor Switch Temperature Sensor and Meat Probe J5 L1 Power to Transformer J6 Door Switch Lights Lock Motor and Cooling Fans J9 Connects to Auxiliary Control Board J12 Lock Motor and L1 Power T1 Transformer K1 Upper Broil Relay K2 Upper Bake Relay K4 Lower Broil Relay K5 Lower Bake Relay K7 Upper Lock Motor...

Page 50: ...120 VAC from J4 7 and J4 5 terminals to L1 If 120 VAC is present but the light does not turn on the light bulb is bad or there is a loose connection in the wire harness If 0 VAC press Oven Light key on the key panel and retry If still 0 VAC check the key panel If the key panel is OK replace the control If you hear a relay click when the Oven Light key on the control panel is pressed the key panel ...

Page 51: ...following checks Check the voltage from terminal CW and CCW to N on the control it should always read 120 VAC in Conv Bake or Convection Roast modes If the voltage OK check the convection fan motor It should read approx 15 20Ω at room temperature Check to make sure the fan shaft is not rubbing on the liner Check the door switch Check the capacitor Continued Next Page Model JKP90 TERMINALS VOLTAGE ...

Page 52: ...rol If the convection fan is not running make the following checks Check the voltage from terminal J11 3 to N on the control it should always read 120 VAC in Convection Bake or Convection Roast modes The voltage should also read 120 VAC when the convection fan is running CCW from terminal J11 1 to N upper and J11 5 to N lower when specified and when the convection fan is running CW from terminal J...

Page 53: ...rm Proof Timer Clock and Cook Time pads Audible tone plus display showing the mode of operation selected Clear Off Audible tone and display shows the time of day Probe Audible tone is heard if the probe is plugged in The display will show Probe Oven Light The oven light turns on An audible tone and a relay click are heard Number pads Can only be used after another function has been selected Check ...

Page 54: ...s Ohms Upper Lower JKS10 Oven Sensor CN2 4 to 6 n a 1080 Ω Rm Temp JKP30 JKP35 Oven Sensor CN2 4 to 6 n a 1080 Ω Rm Temp Door Unlatched CN2 1 to 3 2 to 3 n a 0 Ω open Door Latched CN2 2 to 3 1 to 2 n a 0 Ω open JKP55 JKP75 PK956 ZEK958 Oven Sensor J3 upper J4 lower 6 to 8 1 to 2 1080 Ω Rm Temp Door Unlatched J3 upper 3 to 5 4 to 5 0 Ω open J4 lower 4 to 6 4 to 5 0 Ω open Door Latched J3 upper 4 to...

Page 55: ...rform glass touch board key panel test making sure to test EVERY pin combination for possible shorts If there are no shorts the problem is probably with the Control F2 Oven temperature inside oven cavity as measured by sensor over 650 F unlatched or 915 F latched Welded relay contacts on the relay board Cooling fan stalled or blocked Airflow to rear of unit High resistance in oven sensor leads and...

Page 56: ... Element To test the hidden bake element the resistance should read approximately 27 Ω between the orange wire at DLB and the yellow wire at BAKE See photo Convection Element To test the convection element the resistance should read approximately 22 Ω between the orange wire at DLB and the blue wire at CONV See photo Broil Element To test the broil element the resistance should read approximately ...

Page 57: ...en L1 and N and approximately 240 VAC between L1 and L2 See photo Convection Fan Motor To test the convection fan motor the resistance should read approximately 168 Ω between the red wire at CW and the blue wire at CCW See photo Sensor To test the sensor the resistance should read approximately 1100 Ω at room temperature between the 2 white wires at pin 6 and pin 8 on CN2 See photo ...

Page 58: ...NG Disconnect electrical power before servicing Caution Label all wires prior to disconnection Wiring errors can cause improper and dangerous operation Verify operation after servicing Continued Next Page Model JKS10 RELAY COILS 850 Ω 24 VDC ...

Page 59: ... 59 Continued Next Page Model JKP30 OVEN TEMP 1100 Ω ROOM TEMP 2650 Ω CLEAN TEMP ...

Page 60: ... 60 Continued Next Page Model JKP35 ...

Page 61: ... 61 Continued Next Page Model JKP55 ...

Page 62: ... 62 Continued Next Page Models JKP70 PK916 ZEK938 ...

Page 63: ... 63 Continued Next Page Models JKP75 PK956 ZEK958 ...

Page 64: ... 64 Model JKP90 OVEN TEMP 1100 Ω ROOM TEMP 2650 Ω CLEAN TEMP Ω ROOM TEMP Ω ROOM TEMP RELAY COILS 650Ω 24 VDC ...

Page 65: ... or consequential damages This warranty gives you specific legal rights and you may also have other rights which vary from state to state To know what your legal rights are consult your local or state consumer affairs office or your state s Attorney General Warrantor General Electric Company Louisville KY 40225 All warranty service provided by our Factory Service Centers or an authorized Customer ...

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