KEMS308SSS00 Tech Sheet - 8304098 - Rev B.pdf

TECH SHEET - DO NOT DISCARD

PAGE 1

WARNING

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOS EXP OSUR URE E TO EX EXCE CESSI SSIVE VE MICROWAVE ENERGY

Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.

nott op oper erat ate e or al allo low w th the e ov oven en to be op oper erat ated ed wi with th th the e a. Do no

IMPORTANT

doorr ope doo open. n.

Electrostatic Discharge (ESD) Sensitive Electronics

b. Make the following safety checks on all ovens to be serviced before activati serviced activating ng the magnet magnetron ron or other microwave source, and make repairs as necessary:

ESD problem problems s are present everyw everywhere. here. ESD may damage damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, butt fai bu ailu lure re ma may y oc occu curr at a la late terr da date te du due e to ESD stres ess s. ■

1. Interlock Operation 2. Proper Door Closing 3. Seal and Sealing Surfaces (Arcing, Wear and Other Damage)

Use an anti-stati anti-static c wrist strap. strap. Connect Connect wrist strap to green gree n grou ground nd conn connect ection ion poin pointt or un unpa pain inte ted d me meta tall in the app applian liance ce

4. Damage to or Loosening of Hinges and Latches

-OR-

5. Evidence of Dropping or Abuse

Touch your finger repe atedly to a green ground conn co nnec ecti tion on po poin intt or un unpa pain inte ted d me meta tall in th the e appliance. ■

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Befo fore re tu turn rning ing on mi micr crowa owave ve pow power er fo forr any ser servi vice ce tes testt c. Be or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line and cavity for proper alignment, integrity and connections.

Before removing the part from its package, touch the th e an anti ti-s -sta tati tic c ba bag g to a gr gree een n gr grou ound nd co conn nnec ecti tion on po poin intt or un unpai paint nted ed met metal al in th the e app applia lianc nce. e.

d. Any defective or misadjusted components in the interl ock,

Avoid touch ing elec troni c parts or termi nal conta cts; handle electronic control assembly by edges only.

monitor monit or,, doo doorr sea seal, l, an and d mi micr crowa owave ve gen genera eratio tion, n, an and d tran tr ansm smis issio sion n sy syst stems ems sh shal alll be rep repair aired, ed, rep replac laced, ed, or adjus adj usted ted by pro proce cedur dures es desc descri ribed bed in ser servi vice ce ma manu nual al before bef ore the oven is rele releas ased ed to to the the owne ownerr.

When rep When repack ackagi aging ng fai failed led ele elect ctron ronic ic con contro troll a ss ss em em bl bl y i n a nt nt ii- st st at at ic ic b ag ag , o bs bs er er ve ve a bo bo ve ve instructions.

e. A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner.

DIAGNOSTICS ■

f. Do not attempt to operate the oven if the door glass is

Is oven in “Sabbath Mode”? If so “SAB” will appear in the digital display. Press OPTIONS and “7” to end Sabbath mode. This will will return return to BAKE mode mode for an untim untimed ed bake.

broken.

Disconnect power and perform the following checks: ■

A potential cause of a control not functioning is corrosion on connections. Observe connections and check for continuity with an o hmmeter hmmeter..

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All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 ohms per volt DC or greater.

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Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. Damaged harness must be entirely replaced. Do not re-work a harness.

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Voltage checks must be made with all connectors attached to the boards.

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Resistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected.

SOFTWARE SOFTW ARE COPY COPYRIGHT RIGHTED. ED. THIS PROD PRODUCT UCT IS COVER COVERED ED BY ONE OR MOREOF THE FOLL FOLLOWIN OWING G PATENT TENTS: S: U.S.PA U.S.PATENT TENT NOS. 4,852,544 4,974,804 5,008,516 5,064,998 5,138,137 5,142,125

5,175,413 5,185,047 5,321,229 5,349,162 5,378,874 5,382,552

5,422,460 5,424,512 5,438,180 5,441,036 5,491,314 5,571,433

5,571,434 5,620,623 5,694,916 5,749,388 5,756,970 5,767,488

5,808,278 5,810,576 5,813,320 5,841,112 5,856,654 5,881,710

5,910,265 5,918,589 5,924,857 5,928,543 5,961,311 5,967,634

5,983,888 6,008,478 6,017,211 6,035,848 6,043,461 6,079,756

6,087,944 6,097,000 6,111,231 6,163,017 6,201,222 6,232,584

6,263,782 6,349,717 6,363,971 6,375,150 6,392,204 6,394,081

6,403,929 6,437,294 6,509,551 6,545,251 6,570,136 6,614,006

6,663,009 6,666,676 6,693,262 6,698,417 6,698,923 6,700,101

6,722,356 6,734,403 6,784,404 6,841,761 6,870,138 6,904,969

6,930,287 6,935,330

AND OTHE OTHER R PATENT TENTS S PEND PENDING. ING.

FOR SERVICE TECHNICIAN’S USE ONLY

PART NO. 8304098 REV. B


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Fahrenheit (° F) to Celsius (° C) Conversion

3. Press “3” to increase and “6” to decrease the temperature.

The temperature is preset in Fahrenheit, however it can be changed to Celsius.

4. Press START to end calibration.

To Change: Press OPTIONS and then “1” to toggle temperature between Fahrenheit and Celsius settings.

Programming the Cavity Size

When in Fahrenheit, “°F” follows the oven temperature.

1. Unplug oven or disconnect power. 2. Wait 10 (ten) seconds, plug in o ven or reconnect power. 3. Enter Diagnostics mode by pressing OFF, OFF, START.

Adjust Oven Temperature Calibration: Calibration:

4. Press key #6 to show cavity size select screen.

1. Press OPTIONS and then “6” to set the calibration.

5. To edit press CLOCK key.

2. On double oven o nly, press UPPER OVEN or LOWER OVEN to

5. Scroll through cavity sizes by pressing key #6 until size required is displayed.

select oven. Each oven calibration can be independently set.

7. Once correct size is displayed, press the START key to accept modification.

NOTES: ■

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Always disconnect power before touching internal parts of the oven. Upon replacement, immediately return old electronic oven control using the mailing label supplied with each new control.

Door switch switch state Latch Lat ch swi switch tch sta state te

KEY PADS

Main Cavit Cavityy Temperature

Secondary cavi Secondary cavity ty temperature if a licable

Model Mod el sel select ect sta state te

Meat pro Meat probe be temperature

Warm dra Warm drawer wer temperature (if appli applicabl cable) e)

Model Select State

Description

02

27" Combo Oven Microwave Upper/ Thermal Convection Lower

01

30" Combo Oven Microwave Upper/ Thermal Convection Lower

For combo ovens, the failure code is displayed on the side of the display that corresponds to the o ven with faulty part (microwave oven=right side display; lower oven=left side display).

Upper scrolling Sensor text line temperature display

Door switch switch state Model select sel ect sta state te

Lowerr scr Lowe scroll olling ing tex textt lin linee

Microwave Oven Power Output Test The power output of the magnetron can be measured by the following tap water temperature rise test. NOTES: ■

Be sure oven cavity is clean and cool (not used recently).

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The magne magnetron tron output will will be lower with lower line voltages. voltages.

1. Fill a glass beaker with 10 oz. (300mL) of tap water. Stir the water with a thermometer (digital recommended) and record the temperature. This starting temperature of the water should be between 50°F and 75°F (10°C and 24°C).

2. Place the beaker and water in the center of the microwave oven. Operate on HIGH power level for 30 seconds. 3. When the microwave oven is finished, s tir the thermometer through the water and record the temperature. 4. Subtract the cold water temperature from the warm water temperature to get the temperature rise. No rmal range is a shown in the following table. Voltage (VAC under load)

Temperature Rise

120V

20-27°F

11-15°C

108V

18-27°F

10-15°C



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FAILURE/ERROR DISPLAY CODES

Screen 3:

Before proceeding with any corrective action, perform the following steps to enter the Diagnostic mode.

Displays the last error code in memory. If GOOD is displayed there is not an error coded in memory.

1. Press the OFF key. 2. Press the OFF key.

To Clear Last Error Code 1. Unplug oven or disconnect power.

3. Press the START key. If control does not enter Diagnostics,

2. Wait 10 second, reconnect or plug in oven.

repeat steps.

Screen 1: A. Main clock hours display shows latch state in first display position, and door state in second position.

B. Main clock minutes display shows the model select state associated with control system.

3. Enter Diagnostics mode by pressing OFF, OFF, START. 4. Press key #6 to show cavity size select screen. 5. Press key #6 to show error code. 6. To edit press CLOCK key. 7. Press START key to clear last error. Control should display GOOD.

C. Main temperature display shows the cavity temperature. D. Lower text line shows software versions for appliance manager (AM), user interface (UI) and EEPROM version. Press key #6 to scroll to next screen.

Troubleshooting Key strokes ■ ■

Screen 2:

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Screen displays programmed cavity size. Press key #6 to scroll to next screen.

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FAILURE ERROR (Leftmost (Rightmost 2 Clock 2 Clock Digits) Digits) F0 Default F1 Component

E0 E0

MESSAGE/DESCRIPTION SUGGESTED CORRECTIVE ACTION PROCEDURE

PROCEDURE: Before proceeding, press OFF, OFF, START to enter the Diagnostic

CHECK OVEN APPLIANCE MANAGER

mode and verify the error codes. A. Unplug oven or disconnect power. B. Check oven door switch. If OK, go to step C. C. Replace oven appliance manager. D. Replace all parts and panels before operating. E. Plug in oven or reconnect power. F. Verify operation is normal. Press OFF, OFF, START to reenter the Diagnostic mode and complete checks. E2

SUGGESTED CORRECTIVE ACTION PROCEDURE

CHECK OVEN USER INTERFACE


F1 Component

MESSAGE/DESCRIPTION

F1 Component

mode and verify the error codes. A. Unplug oven or disconnect power. B. Replace oven user interface board. C. Replace all parts and panels before operating. D. Plug in oven or reconnect power. E. Verify operation is normal. Press OFF, OFF, START to to reenter the Diagnostic mode and complete checks. E1

FAILURE ERROR (Leftmost (Rightmost 2 Clock 2 Clock Digits) Digits)

No failure (GOOD)


F1 Component

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Press the Bake key activates Bake relay. Press Broil key once to activate Outer Broil, press again for Inner Broil. Press Convect Bake key activates Convect Ring and Fan. Press Self Clean key activates Latch Motor. Press Cook time key once to activate low speed, press again for high speed.

CHECK MICROWAVE USER INTERFACE


mode and verify the error codes. A. Unplug oven or disconnect power. B. Replace microwave user interface. C. Replace all parts and panels before operating. D. Plug in oven or reconnect power. E. Verify operation is normal. Press OFF, OFF, START to reenter the Diagnostic mode and complete checks.


E3

CHECK MICROWAVE APPLIANCE MANAGER

mode and verify the error codes. A. Unplug oven or disconnect power. B. Replace microwave appliance manager. C. Replace all parts and panels before operating. D. Plug in oven or reconnect power. E. Verify operation is normal. Press OFF, OFF, START to reenter the Diagnostic mode and complete checks. F1 Component

E4

CHECK MICROWAVE POWER RELAY


mode and verify the error codes. A. Unplug oven or disconnect power. B. Replace microwave power relay. C. Replace all parts and panels before operating. D. Plug in oven or reconnect power. E. Verify operation is normal. Press OFF, OFF, START to reenter the Diagnostic mode and complete checks. F1 Component

E5

CHECK MICROWAVE INVERTER

PROCEDURE:

Before proceeding, press OFF, OFF, START START to enter the Diagnostic mode and verify the error codes. A. Unplug oven or disconnect power. B. Replace microwave inverter. C. Replace all parts and panels before operating. D. Plug in oven or reconnect power. E. Verify operation is normal. Press OFF, OFF, START to reenter the Diagnostic mode and complete checks. F2 Keypad

E0 E1

KEYPAD DISCONNECTED STUCK OR SHORTED KEY

PROCEDURE:

Before proceeding, press OFF, OFF, START START to enter the Diagnostic mode and verify the error codes. A. Unplug oven or disconnect power. B. Check keypad connector for firm connection. C. Replace all parts and panels before operating. D. Plug in oven or reconnect power. E. If error code returns after 60 seconds proceed to step F. F. Unplug oven or disconnect power. G. Replace keypad.





H. Replace all parts and panels before operating. I. Plug in oven or reconnect power. Wait 60 seconds. J. If error code returns after 60 seconds, proceed to step K. K. Unplug oven or disconnect power. L. Replace cable connecting user interface and keypad. M. Replace all parts and panels before operating. N. Plug in oven or reconnect power. Wait 60 seconds. O. If error code returns after 60 seconds, proceed to step P. P. Unplug oven or disconnect power. Q. Replace oven user interface. R. Replace all parts and panels before operating. S. Plug in oven or reconnect power. Wait 60 seconds. T. Verify operation is normal. Press OFF, OFF, START to reenter the Diagnostic

mode and complete checks. LOWER MAIN OVEN SENSOR SHORTED OR OPEN E1 F3

Sensors

E3

MEAT PROBE SHORTED

PROCEDURE: Before proceeding, press OFF, OFF, START START to enter the Diagnostic

mode and verify the error codes. A. Verify cavity temperature on Screen 1. B. If dashes appear in main temperature display go to step C. C. Unplug oven or disconnect power. D. Remove back panels and ensure the indicated temperature sensor is plugged in properly and fully inserted. If not, plug in the connector and proceed to step J. If sensor is plugged in properly go to step E. E. Check connector P2 on the appliance manager. Ensure P2 connector is plugged in properly and fully inserted. If connector is inserted properly go to step J. If not go to step F. F. Visually inspect the wires between P2 on the appliance manager and the indicated temperature sensor. Make sure the wires are not pinched or cut. If wires appear intact, unplug P2 connector on the appliance manager. Go to step G. G. Measure the indicated sensor resistance value (measure between appropriate P2 connector pins). For the following sensors, the resistance value should read: Lower Oven Sensor Sensor Betwe Between en 931 and 2869 2869 Ω (Approx. 1080 Ω at room temp.) Meat Probe Senso Sensorr Betwe Between en 1,300 1,300 and and 103,000 103,000 Ω. (Approx. 59,000 Ω at room temp.) (Insert meat probe into meat probe jack located inside the oven cavity prior to reading resistance.) If indicated temperature sensor does not meet these requirements go to step H. If indicated temperature sensor does meet these requirements go to step J. H. For LOWER sensor: Replace appropriate temperature sensor. Repeat step G. If the requirements are not met, replace sensor harness. Repeat step G. For MEAT PROBE sensor: Replace meat probe sensor. Repeat step G. If the requirements are not met, replace sensor harness. Repeat step G. If the requirements are still not met, replace the meat probe jack. Repeat step G. If the meat probe sensor is still not operating correctly go to step I. I. Replace the appliance manager. Ensure all connectors are properly placed and firmly connected. J. Replace all parts and panels before operating. K. Plug in oven or reconnect power. Wait 60 seconds. L. Enter into Diagnostic mode and read sensor for main oven sensor and meat probe on immediate display. WARMING DRAWER SENSOR SHORTED OR OPEN F3 E2 Sensors PROCEDURE: Oven is not equipped with this feature. If error occurs press OFF, OFF, START enter into Diagnostics mode, then replace user interface with correct control associated with this product. F4 Microwave Sensors

E1 E2 E4

CONVECTION THERMISTOR INTERNAL TEMPERATURE SENSOR HUMIDITY SENSOR


PAGE 4



PROCEDURE: There are three sensors for the microwave. They are the Convection

Thermistor, Ambient Sensor (integrated on the MW appliance manager), and Humidity Sensor. Before proceeding, press OFF, OFF, START to enter the Diagnostic mode and verify the error codes. A. Press the number "6" key to transition to the Sensors screen. B. Verify in diagnostics the temperature readings on sensor. C. The sensors for the combo microwave oven will scroll through the list of sensors. D. If a sensor reading on the display shows (---) dashes, the sensor is not connected or otherwise inoperable. If sensor that shows dashes is the ambient sensor, proceed to step O. E. Unplug oven or disconnect power. F. Remove top panel to gain access to the microwave control system. G. Ensure the convection thermistor (P6) and the humidity sensor (P4) are plugged in properly to the appliance manager. If not, plug in the connector and proceed to step R. If connectors are plugged in proceed to step H. H. Visually inspect the wires between P6 and convection thermistor from the appliance manager to the back of the unit to ensure they are not pinched or cut. If wires appear to be intact, unplug connector and proceed to step I. I. Measure the indicated sensors resistance value from the P6 connector. For this sensor, the resistance value should read 231 k Ω at 25°C. J. Visually inspect the wires between P4 and humidity sensor from the appliance manager to the front of the unit to ensure they are not pinched or cut. If wires appear to be intact, unplug connector and proceed to step K. K. Measure the indicated sensors resistance value from the P4 connector. For this sensor, the resistance value should read 2.8 k Ω at 25°C (between pins 3 and 1 or between pins 3 and 2). L. If indicated temperature sensor does not meet these requirements proceed to step M. M. Replace convection thermistor. Ensure the convection thermistor is properly inserted and plugged into P6. Continue to step P. N. Replace humidity sensor. Ensure the humidity sensor is properly inserted and plugged into P4. Continue to step P. O. Replace microwave appliance manager. Ensure all connectors are properly placed and firmly connected. P. Replace all parts and panels before operating. Q. Plug in oven or reconnect power. Wait for 60 seconds. R. Enter into the Diagnostic mode and press key "6" to scroll to the sensor display. Read the sensor reading for the three sensors, ensuring they are reading correctly. NONE IDENTIFIED FOR MICROWAVE METHOD FOR F5 DETERMINING FAILURE

PROCEDURE: Before proceeding, press OFF, OFF, START to enter Diagnostic

mode and verify the error codes. Using the main screen upon entering diagnostics open and close door on microwave. In the hours field, the second digit should show "0" when door is open and "1" when door is closed. If display shows a "0" when door is closed and does not transition to a "1", verify position of door switches and replace as necessary. F5

E0 E1

DOOR AND LATCH SWITCH DO NOT AGREE DOOR LATCH NOT OPERATING.


mode and verify the error codes. TO VERIFY DOOR SWITCH: A. While in diagnostics, open the oven door. The second digit on the clock display should toggle between “1” and “0” as the door opens and closes. When door is closed display should show “1”, when the door is open display should show “0”. If the second digit on the clock display did not toggle, go to step B. If the digit did not toggle after replacing the door switch, go to step D. If the digit did not toggle after replacing the door switch harness, go to step F. B. Unplug oven or disconnect power. C. Replace door switch. (If door switch is integral to the door/latch motor assembly, replace the entire door/latch motor assembly). Go to step H. D. Unplug oven or disconnect power. E. Check the integrity of the harness wires and connections between the appliance manager and the door/latch assembly. Ensure there are no shorted or pinched wires. If the wiring harness is pinched or damaged, replace the door switch harness. Go to step H. If wiring harness is good, go to step H. F. Unplug oven or disconnect power. G. Replace appliance manager. Go to step H. H. Replace all parts and panels before operating. I. Plug in oven or reconnect power. J. Press OFF, OFF, START to reenter Diagnostic mode. Repeat step A.



FAILURE ERROR (Leftmost (Rightmost MESSAGE/DESCRIPTION 2 Clock 2 Clock SUGGESTED CORRECTIVE ACTION PROCEDURE Digits) Digits) TO VERIFY DOOR LATCH SWITCH/MOTOR ASSEMBLY: ASSEMBLY: A. While in diagnostics, press the CLEAN key within the first 120 seconds of power up to cycle the latch motor to the locked position. “1” should display in the first clock digit from the left when locked. Press the CLEAN key to cycle the latch motor to the unlocked position. The first clock digit should toggle to “0” when the door is unlocked. If the digit did not toggle, go to step B. If motor runs continuously, wait until motor reaches the unlocked position, open the door and press the OFF key. Go to step B. If motor did not run go to step H. If the digit did not toggle after replacing the door latch motor assembly, go to step D. If the digit did not toggle after replacing the door switch harness, go to step F. If the digit did toggle, door latch switch is operating correctly. B. Unplug oven or disconnect power. C. Replace door latch motor assembly. Go to step K. D. Unplug oven or disconnect power. E. Check the integrity of the harness wires and connections between the appliance manager and the door/latch assembly. Ensure there are no shorted or pinched wires. If the wiring harness is pinched or damaged, replace the door switch harness. Go to step H. If wiring harness is good, go to step H. F. Unplug oven or disconnect power. G. Replace appliance manager. Go to step H. H. Replace all parts and panels before operating. I. Plug in oven or reconnect power. J. Press OFF, OFF, START to reenter Diagnostic mode. Repeat step A. LOST COMMUNICATIONS F6 E0 System START to enter Diagnostic PROCEDURE: Before proceeding, press OFF, OFF, START mode and verify the error codes. Ensure AM software, UI software and EEPROM CHECKSUM versions appear on the lower text line. If AM software and EEPROM versions do not appear, UI and AM may not be communicating. Verify this for the lower oven UI and for the microwave (upper oven) UI. The lower oven UI will show the AM software version for the lower oven appliance manager, and the microwave UI will show the AM software and EEPROM versions for the microwave appliance manager. If the lower oven UI is not displaying the AM software version, go to UI IS NOT DISPLAYING AM SOFTWARE VERSION. If the upper oven UI is not displaying the AM software and EEPROM versions, go to UPPER OVEN UI IS NOT DISPLAYING THE AM SOFTWARE AND EEPROM VERSIONS. If lower oven UI and microwave UI are both displaying an error, go to LOWER OVEN UI AND MICROWAVE UI ARE BOTH DISPLAYING AN ERROR. UI IS NOT DISPLAYING AM SOFTWARE VERSION: A. Unplug oven or disconnect power. B. Open the back panels and make sure the P6 and P2 connectors are fully inserted on the appliance manager and on the lower oven user interface board. - If they are not plugged in, plug in connectors and go to step F. - If they are plugged in, go to step C. C. Visually inspect all wires between P6 on the appliance manager and P2 on the lower user interface. - Make sure wires are not cut or pinched. - If the wires appear to be intact, perform a continuity check between P6-1 of the appliance manager and P2-1 of the user interface board. Complete for P6-2(AM) to P2-2(UI), P6-4(AM) to P2-4(UI) and P6-5(AM) to P2-5(UI). All the measurements made should be less than 5 Ω. If any of these measurements exceeds 5 Ω, go to step E. D. Replace the appliance manager. Ensure all connectors are properly inserted. E. Replace the wiring harness (signal). Ensure all connectors are properly inserted. F. Replace all parts and panels before operating. G. Plug in oven or reconnect power. H. Observe for longer than 1 minute to determine if error has been repaired. I. If error does not appear, initiate a bake cycle. Let the cycle run for at least 1 minute. - If no error occurs, cancel the cycle, the problem has been repaired. - If error occurs again, restart the troubleshooting procedure at step A. At step D, replace the lower oven user interface board if appliance manager has already been replaced. - If both are replaced the problem has been repaired.


PAGE 5

FAILURE ERROR (Leftmost (Rightmost MESSAGE/DESCRIPTION 2 Clock 2 Clock SUGGESTED CORRECTIVE ACTION PROCEDURE Digits) Digits) UPPER OVEN UI IS NOT DISPLAYING THE AM SOFTWARE AND EEPROM VERSIONS: A. Unplug oven or disconnect power. B. Open the back panels and make sure the P2 and U3 connectors are fully inserted on the microwave user interface and the wide interface board. Make sure the P1 connector on the wide interface board and the P10 connector on the microwave oven appliance manager are inserted. - If the P2 (mwo UI) and U3 (wide interface board) are plugged in, go to step C. - If the P2 (mwo UI) to U3 (wide interface board) connectors are not connected, plug in the connectors and proceed to step F. If the P1 (wide interface board) to P10 (microwave appliance manager) connectors are not connected, plug in the connectors and go to step F. If the P1 (wide interface board) to P10 (microwave appliance manager) are plugged in, go to step D. C. Visually inspect all wires between P2 on the microwave user interface and U3 on the wide interface board. Make sure the wires are not cut or pinched. If the wires appear to be intact, perform a continuity check between P2-1 and U3-1 of the microwave user interface (mwo UI) and the wide interface board. Complete for P2-2 (mwo UI) to U3-2 (wide interface board), P2-4 (mwo UI) to U3-4 (wide interface board), and P2-5 (mwo UI) to U3-5 (wide interface board). All the measurements should be less than 5 Ω. - If any of these measurements exceeds 5 Ω, replace the wiring harness (signal). Ensure all connectors are properly inserted and go to step H. - If the measurements are less than 5 Ω, reconnect P2 and go to step D. D. Visually inspect all wires between P1 on the wide interface board and P10 on the microwave appliance manager. Make sure the wires are not cut or pinched. If the wires appear to be intact, perform a continuity check between P1-1 on the wide interface board to P10-1 on the microwave appliance manager, continuing for P1-2 (wide interface board) to P10-2 (microwave appliance manager), P1-3 to P10-3, P1-4 to P10-4, P1-5 to to P10-5 and finally P1-6 to P10-6. All the measurements should be less than 5 Ω. If any of these measurements exceeds 5 Ω, go to step F. If the measurements are less than 5 Ω, reconnect P1 and go to step E. E. Replace the wide interface board. Ensure all connectors are properly inserted. Go to step H. If the wide interface board has already been replaced and the error has not been corrected, proceed to step G. F. Replace wiring harness (between P1 and P10) and proceed to step H. G. Replace the microwave appliance manager. Ensure all connectors are properly inserted. insert ed. Go to step H. H. Replace all parts and panels before operating. I. Plug in oven or reconnect power. J. Observe for longer than one minute to determine if error has been repaired. K. If error does not appear, initiate a microwave cycle. Let the cycle run for at least 1 minute. - If no error occurs, cancel the cycle, the problem has been repaired. - If error occurs, restart the troubleshooting procedure at step A. At step E, replace the microwave user interface board if the wide interface board and/or microwave appliance manager have already been replaced. - If both are replaced the problem has been repaired. LOWER OVEN UI AND MICROWAVE UI ARE BOTH DISPLAYING AN ERROR: A. Unplug oven or disconnect power. B. Open the back panels and make sure the P2 connector on the lower oven UI and the P2 connector on the microwave UI and fully inserted. - If they are not, plug the connectors in and go to step F. - If they are plugged in, go to step C. C. Visually inspect all the wires between P2 on the lower oven UI and P2 on the microwave user interface. Make sure the wires are not cut or pinched. If the wires appear to be intact, perform a continuity check between P2-1 of the lower oven UI and P2-1 of the user interface board. Complete for P2-2 (lower oven UI) to P2-2 (microwave UI), P2-4 (lower oven UI) to P2-4 (microwave UI) and P2-5 (lower oven UI) to P2-5(UI). All the measurements made should be less than 5 Ω. - If any of these measurements exceeds 5 Ω, go to step E. - If any measurements are less than 5 Ω, reconnect P2 and go to step D. D. Replace the lower oven UI. Ensure all connectors are properly inserted. Go to step F. E. Replace the wiring harness (signal) and proceed to step F. F. Replace all parts and panels before operating. G. Plug in oven or reconnect power. H. Observe for longer than 1 minute to determine if error has been repaired. I. If error does not appear, initiate a bake cycle. Let the cycle run for at least 1 minute. - If no error occurs, cancel the cycle, the problem has been repaired. - If error occurs again, restart the troubleshooting procedure at step A. (Except in step D, replace microwave user interface board if lower oven UI has already been replaced.)





COOK OVEN OVER TEMPERATURE CLEAN OVEN OVER TEMPERATURE PROCEDURE: Before proceeding, press OFF, OFF, START to enter the Diagnostic mode and verify the error codes. A. Inspect all of the elements, convect ring, bake and broil. Visually inspect all elements to ensure they are not operating. B. Unplug oven or disconnect power. Wait 10 seconds. C. Plug in oven or reconnect power. D. Enter into Diagnostics following steps 1 through 3 on page 2. E. Press the BAKE key to cycle the bake relay on and off as long as Diagnostics mode is within the first 120 seconds of power up. F. If the bake relay does not cycle, proceed to step G. G. Unplug oven or disconnect power for 30 seconds. H. Plug in oven or reconnect power. I. Enter into Diagnostics by pressing OFF, OFF, START. Press the BAKE key and cycle relay on and off. If the bake relay does not cycle on and off, go to step P. If the element does not cycle with the relay, go to step N. If the element does cycle on and off, go to step J. J. Press the BROIL key, while in Diagnostics mode, to cycle the broil relays. Press BROIL key one time for outer broil element. Ensure outer broil relay energizes by inspecting the outer broil element. Press BROIL key again for inner broil element. Ensure inner broil relay energizes by inspecting the inner broil element. If broil relay does not turn on and off, go to step P. If the element does not cycle with the relay, go to step N. If the element does cycle on and off, go to step K. K. Press the CONVECT key, while in Diagnostics mode, to cycle the convect relay on and off. L. If the convect relay does not turn on and off, go to step P. M. If the element does not cycle with the relay, go to step N. N. Unplug oven or disconnect power. O. Check integrity of all harness wires and connections between the appliance manager and the electrical elements. Ensure all wiring and connections between the appliance manager and elements, and the appliance manager and user interface are intact and properly seated and that no wires are shorted or damaged. If the wiring connections are intact, go to step Q. If the wiring connections are damaged, go to step S. P. Unplug oven or disconnect power. Q. Replace the appliance manager. Go to step T. R. Replace user interface board. Go to step T. S. Replace the harness. T. Replace all parts and panels before operating. U. Plug in oven or reconnect power. V. Verify operation is normal. Press OFF, OFF, START to reenter Diagnostic mode and complete checks. F6

E1 E2

MINI OVEN/WARM DRAWER OVER TEMPERATURE PROCEDURE: Oven is not equipped with this feature. If error occurs, before proceeding press OFF, OFF, START enter into Diagnostics mode and verify the error codes, then replace user interface with correct control associated with this product. F6

E3


PAGE 6



USER INTERFACE/ APPLIANCE MANAGER MISMATCH PROCEDURE: Before proceeding, press OFF, OFF, START to enter the Diagnostic mode and verify error code. A. Unplug oven or disconnect power. Wait for 10 seconds. B. Plug in oven or reconnect power. C. Enter into Diagnostics mode by pressing OFF, OFF, START. D. Press BAKE. Ensure bake relay energizes by inspecting bake element. E. Press BROIL one time for outer broil element. Ensure outer broil relay energizes by inspecting the outer broil element. F. Press BROIL again for inner broil element. Ensure inner broil relay energizes by inspecting the inner broil element. G. Press SELF CLEAN to drive door latch to lock door. Press again to reset the door latch to normal state. Press again for high speed. H. Press COOK to activate the low speed cooling fan. Press I. If all functions are working, the AM and UI are properly working. J. Exit Diagnostics by pressing OFF. K. Press BAKE and ensure that bake relay energizes and the control enters the bake preheat. Wait up to 60 seconds to ensure error has been resolved. If error returns, proceed to step L. L. Unplug oven or disconnect power. M. Remove covers for access to oven controls. N. Replace the appliance manager. Ensure all connections are properly seated. Go to step O. O. Replace all parts and panels before operating. P. Plug in oven or reconnect power. Q. Press BAKE and ensure the bake relay energizes and the control enters into bake/preheat. Wait up to 60 seconds to ensure error has been resolved. If error returns, go to step R. R. Replace the user interface. Ensure all connections are properly seated. Go to step S. S. Replace all parts and panels before operating. T. Plug in oven or reconnect power. U. Press BAKE and ensure the bake relay energizes and the control enters into bake/preheat. Wait up to 60 seconds to ensure error has been resolved. F6

E4

NO CAVITY SIZE COMMAND E5 PROCEDURE: Before proceeding, press OFF, OFF, START to enter Diagnostics mode and verify the error codes. Control should immediately power up in cavity size select mode. Using key #6 (down) and key #3 (up) scroll through to locate the corresponding cavity size. Once located, press the start key to accept the proper cavity size for the unit being programmed. Control should reinitialize to cavity size selected. If error returns at least 60 seconds after cavity size has been set, go to step A. A. Unplug oven or disconnect power. Wait 10 seconds. B. Plug in oven or reconnect power. C. Enter into Diagnostics mode by pressing OFF, OFF, START. Press #6 (down) once main diagnostics screen appears. Screen should identify cavity size for unit being programmed. If this is incorrectly shown, press CLOCK to edit current programmed size. Press #6 (down) to locate the proper cavity size. Once located, press START to accept the new cavity size. Control will reset and initialize the new cavity size programmed. Wait for 60 seconds to ensure error has been corrected. If error is corrected, replace all parts and panels before operating. If error returns, proceed to step D. D. Unplug oven or disconnect power. E. Replace user interface oven control ensuring all connections are properly seated and go to step F. F. Replace all parts and panels before operating. G. Plug in oven or reconnect power. H. Control may power up in cavity size select mode. Set cavity size as outlined in step C by locating proper cavity size and pressing START once located. I. Wait for at least 60 seconds to ensure error has been corrected. F6



PAGE 7

WIRE HARNESS SCHEMATIC

SYMBOLS

NOTES: ■

When replacing the electronic control, be sure to program the cavity size. See “Programming the Cavity Size” on page 2.

■

Dots indicate connections or splices.

■

Circuit shown in STANDBY/OFF mode with oven door closed.

GROUND GROUN D (CHA (CHASSIS) SSIS)

RELAY RELA Y COIL

PLUGWITH FEMAL FEMALEE CONNECTOR

RELAY CONTACTS

RECEPTACLE WITH RECEPTACLE MALECONNECTOR

L1 N L2 BK

BR

BU

W R

HALOGEN HAL OGEN LIGHT

LINE20A FUSE

BK

BR

LINEFILTER LINEFILTE R L1 BK

P33

P32

R

BR

R

BR

P1-1 P2-6

2

THERMOACTUATOR

OPERATED BYDOOR

THERMOSTAT

PRIMARY INTERLOCK SWITCH CH 106 1060 0 2 SWIT

1 4 1

R

4

BU

Y Y

P2-8 P2-7 P2-4 P2-3 P2-2 P2-1

P2-5

W R

BK

BK BK CONV.FAN BK BK MAGNETRONFAN MAGNE TRONFAN BK BR TURNTABLE BR

1170 CONVECTION THERMOSTAT

Y/G

W

W P31

W

4904 1

BR

R

R

W

P34 3

1

W

2

R

4905 1

Y/G 18

4

4903

LINEFILTER LINEFILT ER L2 BK

W

1620 CONV THERMISTOR

W

2 P8-3 P8-2 P8-1

HUMIDITY SENSOR 1600

P4

P1-3

P1-2 W

1130 CAVITY THERMOSTAT

BU

BU

SECONDARY 4 INTERLOCK SWITCH INTERLOCK 1040

CN702 CN703

1

E701

R F

R FA Y/G

BU

MAGNETRON 1020 THERMOSTAT W MAGNETRON Y

P3-1

2

BU 1

MW INVERTER

CN701

W

P10

BU CONV.1200W

P6

° t

1180 GRILL THERMOSTAT

2

MICROWAVE APPLIANCE MICROWAVE MANAGER

BK W GRILL1600W

2

N L2

GND

CONV. THERMOACTUATOR

P3-2

MW LIGHT TRANSFORMER

BR

RESISTOR

ENCLOSED THERMISTOR

AC DRIV DRIVEE MOTOR

MONITOR INTERLOCK SWITCH1050

THERMAL CUTO THERMAL CUTOFF FF (MANUALLY RESETTABLE)

HEATING ELEMENT

LIGHT

MONITOR MONI TOR FUSE 20A BK BK

THERMAL CUTOF THERMAL CUTOFFF (NON-RESETTABLE)

BK

W P1 WIDEINTERFACE BOARD WIDEINTERFACE U3

MICROWAVE LOWER OVEN

KEYPAD

P4 MWUI BOA BOARD RD

P3

LOWER LOW ER OVENUI BOARD

P1

P2

R

W R

CONTROL POWER TRANSFORM TRANSFORMER ER

BK

BK

V OR

W

W

P2-5 P2-6

T3-3 R

BR

BR

P1-5 OR OR BR P1-7 DOORSWITCH (ON LAT LATCH CH ASSY)

BU BU T T P1-4 LATCH SWITCH (OPERA (OPE RATED TED BY MOTO MOTOR) R) BK P8-1

BK

W

BK

V

W W

P7-3

T4-4 T4-3

BK

BK

W

Y

Y P8-5

LOWER DOOR LOWER LOCK LATCH

EOL TESTE TESTER R R/W P5-1 CONNECTION G P5-3

W


R

P6 LOWER LOW ER OVEN P2-1 APPLIANCE P2-2 MANAGER

BK P9-5

P7-1

W Y

T3-2 Y

T3-4 OR T3-1 BU T1-1 R

CONV.. 1600W CONV

R

BAKE2000W OR IN BRO BROIL IL 180 1800W 0W BU OUT BROI BROILL 1450W

T1-2 R/W

R

OVEN SHUTDOWN THERMAL CUTOFF (NONRESETTABLE) 105°C(221°F)

T2-1 R R

T2-2 R/W P8-3 OR

CONV.. FAN CONV

W HALOGENLIGHTS HAL OGENLIGHTS 5W BULB OPERAT OPER ATES ES IN ALL MODE MODES S EXCEPT SELF-CLEAN W

LOWER OVENLIGHT LOWER TRANSFORMER W BK/ P8-6 W BK BK P8-4 GY W GY GY P9-2 GY BLOWER SPEED BLOWER RESISTOR

BK W W

W



PAGE 8

OVEN COMPONENTS Microwave User Inter Interface face Board

Lower Oven Lower Oven User Inter Interface face Board

KeyPad

Convection Thermistor

Magnetro Magn etronn Fan Moto Motor r

MW Inverter

Microwave Appliance Manager

Magnetron Thermostat Microwave Light Microwave Transformer Magnetron

Convection Thermostat Convectio Conv ectionn Ring Elem Element ent Convectio Conv ectionn Fan Moto Motor r

WIDE Interface Inter face Boar Boardd Convection Thermoactuator

Linee Filter Lin t er L2 Monitor Interlock Inter lock Swit Switch ch

Terminal Term inal Block Grill Therm Thermostat ostat

Primary Interlock Inter lock Swit Switch ch

Line Fil Line Filter ter L1 Monitor Moni tor Fuse

Halogen Halo gen Light Cavity Cavi ty Therm Thermosta ostatt

Linee Fus Lin Fusee Lower Oven Oven Light Transformer Control Cont rol Pow Power er Transformer Secondary Secon dary Inter Interlock lock Switch Lower Low er Ove Ovenn Appliance Manager

Blower Motor Blower

Grill Elem Element ent Humidity Humid ity Senso Sensor r Microwave Micro wave Door Glass

Turntable Turnt able Moto Motor r

Blower Speed Resis Resistor tor Lower Temper Temperature ature Sensor Sen sor (on Rea Rearr Pa Panel) nel) Lower Door Lockk Lat Loc Latch ch

Oven Shutdo Shutdown wn Therm Thermal al Cutofff (non-r Cutof (non-resetta esettable) ble) Halogen Light

Convection Ring Elemen Elementt

IN/OUT Broil Elemen Elementt

Convection Fan Mot Motor or

Oven Door Glass Door Gasket

Halogen Light (2X) Light

Meat Pro Probe be Hidden Bake Elemen Elementt




PAGE 9

RELAY LOGIC - LOWER LOWER OVEN IL M

MODES

RELAY LOGIC - MICROWAVE OVEN Y

S IL R O LE A N E L A L T R Y E F O E A R N W L K E B R T B V V E O E N N B R B A IN O U O O D L O V B L C C

OFF BAKEE PRE BAK PRE-B -B BAKEE PRE BAK PRE-A -A BAKE BA KE SS CBAKEE PRE CBAK PRE-B -B CBAKEE PRE CBAK PRE-A -A CBAK CB AKEE SS FBROIL FBR OIL PRE PRE-B -B FBROIL FBR OIL PRE PRE-A -A FBRO FB ROIL IL SS INBROI INB ROILL PRE PRE-B -B INBROI INB ROILL PRE PRE-A -A INBR IN BROI OILL SS CBROIL CBR OIL PRE PRE-B -B CBROIL CBR OIL PRE PRE-A -A CBRO CB ROIL IL SS CROAST CROA ST PRE PRE-B -B CROAST CROA ST PRE PRE-A -A CROAS CRO ASTT SS BPROOF BPR OOF PRE PRE-B -B BPROOF BPR OOF PRE PRE-A -A BPRO BP ROOF OF SS DEHYDRA DEHYD RATE TE PRE-B DEHYDRA DEHYD RATE TE PRE-A DEHYDRA DEHYD RATE TE SS CLEAN

L L L L L L L L L L L L L L L L L L L L L L L L H

LOWER OVEN SHUTDOWN THERMAL CUTOFF (NON-RESETTABLE) The ove oven n shu shutdo tdown wn the therma rmall cut cutoff off (non-r (no n-rese esetta ttable ble)) is loc locate ated d at the bac back k of the oven ov en.. It wi will ll sh shut ut do down wn th the e el elem emen ents ts if th the e temp te mper erat atur ure e at th the e bac back k of th the e ove oven n ex exce ceeds eds component compon ent limits limits..

N O T R E N L G IL A R M G

SUPERBA MICROWAVES FULL PWR MICROWAVES VAR. PWR CUSTOM REHEAT CUSTOM DEFROST SOFTEN/MELT POPCORN STEAM CRISP EASY CONVECT COOL DOWN OFF (DOOR CLOSED) DOOR OPEN (COOL DOWN) DOOR OPEN

N A E G IN A N G F B L R F N A V . V . L I N T P N N O M O O O R A C C C T U L

RELAY LOGIC KEY

L H

OFF ON CYCLI CY CLING NG (MAX PERIO PE RIOD: D: 60 SE SEC. C.)) ON OR OFF ON (L (LOW OW SP SPEE EED) D) ON (H (HIG IGH H SP SPEE EED) D)

Thermal Cutoff (non-resettable) Part No. 8304452

Opening Temp.

Reclose Temp.

Marking (with Black Letters)

105°C ± 4°C (221°F ± 7,2°F)

<–35°C (<-31°F) MAX

Green

Verify Verif y tha thatt the oven shu shutdow tdown n the therma rmall cut cutoff off (non-resett (nonresettable) able) is OK. To rep replac lace e thi this s the therma rmall cut cutoff off (no (non-r n-reset esettab table), le), ref refer er to cha chart rt at rig right ht for cor correc rectt par partt num number ber..

1. Unplug oven or disconnect power. 2. Replace the oven thermal cutoff (non-resettable). 3. Replace all parts and panels before operating. 4. Plug in oven or reconnect power.




PAGE 10

FRONT/REAR/ SIDE SERVICEABLE

CAN BE TESTED AT THE APPLIANCE MANAGER CHECK POINTS

RESULTS

Left Side Front Front

-

-

Front

-

-

Front

-

Latch Switch

Fron Fr ontt

P1-4 P1 -4 (T (TAN AN)) to P1 P1-5 -5 (B (BR) R)

Door Switch

Fron Fr ontt

P1-7 P1 -7 (O (OR) R) to P1 P1-5 -5 (B (BR) R)

Latch Motor

Fro ronnt

P8-5 (Y) to Neutr traal (W) Primary Winding Secondary Winding P2-2 (V) to P2-1 (V)

Door Unlocked = Open Circuit Door Locked = Closed Circuit Door Unlocked = Open Circuit Door Locked = Closed Circuit Appprox. 2450 Ω Ap 40 Ω to 45 Ω Less than 1 Ω 1091 Ω @ 75°F (23.9°C)

P2-6 (W) to P2-5 (OR)

78 Ω @ 60°F

P9-2 (GY) to Neutral (W)

181 Ω to 240 Ω

Rear

T1-2 (R/W) to Bake (R) and In Broil (OR)

Closed Circuit

Rear

P8-3 (OR) to Neutral (W)

18Ω

Front

T3-2 (Y) to T2-2 (R/W)

33 Ω to 37 Ω

LOWER OVEN COMPONENTS

Appliance Manager User Interface Board Key Pad Control Power Transformer Halogen Lights

Left Side

Light Transformer

Rear Probe - front Jack - rear Rear

Temperature Sensor Meat Probe Sensor Blower Motor Blower Speed Resistor Oven Shutdown Thermal Cutoff (non-resettable) Convection Fan Motor Convection Ring Element

Rear

Bake Element Inner Broil Element

Rear

Front Front

Outer Broil Eleme Element nt

MICROWAVE OVEN

T3-3 (R) to Oven Thermal Fuse T3-4 (OR) to Oven Thermal Fuse T3-1 (BU) to T2-2 (R/W)

Appliance Manager Cavity Thermostat Control Power Transformer Convection Fan Motor Convection Ring Element Convection Thermistor Convection Thermoactuator Convection Thermostat Grill Element Grill Thermostat Halogen Light Humidity Sensor Inverter Light Transformer Line Filter L1 Line Filter L2 Line Fuse Magnetron Magnetron Fan Motor Magentron Thermostat Monitor Fuse Monitor Interlock Switch Primary Interlock Switch Secondary Interlock Switch Turntable Motor WIDE Interface Board

Top Front Top Rear Rear Rear Top Rear Front Top Top Front Rear/Top Front Top Top Side Top Top Top Front Top Top Top Bottom Front

26 Ω to 30 Ω 31 Ω to 36 Ω 53 Ω to 59 Ω

NOTE: The oven shutdown thermal cutoff (non-resettable) is located at the top of the oven. It will shut down all elements if the temperature at the top of the oven exceeds component limits.

TESTING THE MICROWAVE OVEN COMPONENTS IMPORTANT: ■ ■ ■

■

■

Unplug microwave or disconnect power. Remove the lead wires from the related component before conducting any of the following tests. Discharge the high-voltage capacitor and remove the lead wires from the primary winding of the high-voltage transformer before conducting any of the following tests. All operational checks using microwave energy must be done with the microwave oven loaded with a minimum of 8 oz (250mL) o f water in a microwave safe container.

COMPONENT LINE FILTER, L2 3 1

MAGNETRON

4 2

■ ■ ■

Conduct a microwave energy test after performing any tests or repairs to the microwave oven. Check that all wire leads are in the correct position before operating the microwave oven. Grasp wire connectors when removing the wire leads from microwave to oven parts. All testing must be done with an ohmmeter having a sensitivity of 20,000 ohms per volt DC or greater, and powered by at least a 9-volt battery battery..

TEST PROCEDURE 1. Unplug microwave oven or disconnect power. 2. Remov Removee the leads from from the terminals. terminals. 3. Set the ohmmeter ohmmeter to Rx1 and touch the the leads to the terminals. Terminal 1 - Terminal 3 (coil) Terminal 2 - Terminal 4 (coil) Terminal 3 - Terminal 4 (coil)

1. Unplug microwave oven or disconnect power. 2. Remove wire leads. leads. Check that the seal is in good condition. condition. 3. Measu Measure re resist resistance: ance: Filament terminals Filament chassis


RESULTS

Normal = Less than 1 Ω. Normal = Less than 1 Ω. Normal = 660 k Ω to 700 k Ω. Abnormal= Continuity.

Normal = Less than 1 Normal = Infinite.

Ω.



PAGE 11

COMPONENT

TEST PROCEDURE

CONVECTION FAN MOTOR

1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wire wire leads. leads. 3. Measure resistance:

LINE FILTER, L1

P34

1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wire wire leads. leads. 3. Measu Measure re resist resistance: ance: P31 and P32, P33 and P34

P33

P31

P32 P31 and P34, P32 and P33

CONVECTION RING ELEMENT


HUMIDITY SENSOR

1. Unplug microwave oven or disconnect power. 2. Remove the 3-pin connector connector from Relay Relay Control Board. 3. Measu easure re re resi sist staanc ncee acr acros osss pin pinss 1 and 3 and and acr cros osss pin pinss 2 and 3:

1 BK 2 R 3 W

THERMOSTATS CAVITY/MAGNETRON THERMOSTAT

RESULTS

Normal = 45 Ω. Abnormal = Infinite.

Normal = Greater than or equal to 300 30 0 k Ω. Abnormal = Less than or equal to 100 k Ω. Ω. Normal = 0 Ω. Abnormal = Greater than or equal to Ω. 100 k Ω.


Norm rmaal = 2.8 k Ω (approx.) at 77° ± 10°F (25° ± 10°C). Abnormal = Infinite.

1. Unplug Unplug microwave microwave oven or disconnect disconnect power. power. 2. Rem Remove ove wire wire leads. leads. 3. Measu Measure re resist resistance: ance: Normal = Continuity. Abnormal = Infinite.

Thermostat

Temperature Open

Close

Magnetron

125°C 257°F

85°C 185°F

Cavity

175°C 347°F

Manually Resettable

GRILL/CONVECTION THERMOSTAT

Thermostat

Temperature Open

Close

Convection

145°C 293°F

105°C 221°F

Grill

130°C 266°F

-35°C -31°F




PAGE 12

COMPONENT CONVECTION THERMISTOR

CONVECTION THERMOACTUATOR

CAVITY HALOGEN LIGHT


MAGNETRON FA F AN MOTOR

TURNTABLE MOTOR

COM

GRILL ELEMENT

MONITOR FUSE (20A)

LINE FUSE (20A)

TEST PROCEDURE 1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wire wire leads. leads. 3. Measure resistance:

1. Unplug micr ow owave oven or dis co connec t power. 2. Remove wire wire leads. 3. Measure resistance:

1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wir wiree leads. e ads. 3. Me Measure resistance:

1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wir wiree leads. e ads. 3. Meas Measure ure resistanc resistancee (ohmmeter (ohmmeter scale: scale: Rx1) Rx1) Primary Winding Secondary Winding 1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wir wiree leads. e ads. 3. Measure resistance (ohmmeter scale: Rx1)

1. Unplug microwave oven or disconnect power. 2. Rem Remove ove wir wiree leads. e ads. 3. Meas Measure ure resistanc resistancee (ohmmeter (ohmmeter scale: scale: Rx1k): Rx1k): Turntable Motor





RESULTS

Normal = 230k ± 20% Ω at 77°F (25°C) Abnormal = Infinite.

Normal = 2.3 kΩ . Abnormal = Infinite.


45 Ω (approx.) 0.6 Ω (approx.)


Normal = 2450 Ω (approx). Abnormal = Infinite.

Normal = 9 Ω Abnormal = Infinite

Normal = Continuity Abnormal = Infinite

Normal = Continuity Abnormal = Infinite



PAGE 13

COMPONENT PRIMARY IN INTERLOCK SW SWITCH

SECONDARY INTERLOCK SWITCH

MONITOR IN INTERLOCK SW SWITCH

TEST PROCEDURE

RESULTS

1. Unplug mi microwave ov oven or or di disconnect po power. 2. Disconnect the wires at the Primary Interlock Switch Switch 3. Check from the common terminal terminal (brown wire) to to the normally open terminal terminal Door Open: No Continuity (yellow wire). Door Closed: Continuity ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -----------------------------------------1. Unplug Unplug microwave microwave oven or disconnect disconnect power. power. 2. Disconnect the wires at the Primary Interlock Switch Switch 3. Check from the common terminal (brown wire) to the normally normally closed terminal (blue wire). wire). 1. Unplug micr ow owave oven or dis co connec t power. 2. Disconnect the wires at the Secondary Interlock Switch Switch 3. Check from the common terminal (blue wire) to to the normally normally open terminal (white wire).

Door Open: Continuity Door Closed: No Continuity

Door Open: No Continuity Door Closed: Continuity

1. Unplug mi microwave ov oven or or di disconnect po power. 2. Disconnect the wires at the Monitor Monitor Interlock Switch 3. Check from the common terminal (red wire) to the normally closed terminal (blue wire).

Door Open: Continuity Door Closed: No Continuity

MEASURE OVEN INPUT CURRENT Connect an ammeter (Valhalla Scientific 2101 or equivalent recommended) to measure the input current of microwave oven when the power level is set to Level 10 at the touch panel.

4. Replace all parts and panels before operating. 5. Plug in microwave oven or reconnect power.

If more than 0.5A:

The MW inverter is probably OK. Check the magnetron. See Magnetron test in “Component Tests”. If less than 0.5A:

15A

There is not input to the MW inverter. Check the following: oven or disconnect power. 1. Unplug microwave oven supply. Check relay control board and wiring. 2. No AC voltage supply. 3. No control signal. Check relay control board and wiring.

Amps

CHECK THE MW INVERTER NOTE: Do not try to repair the inverter board, nor try to make any

adjustments to the board. Check wiring to MW inverter: oven or disconnect power. 1. Unplug microwave oven Visually inspect 4 connectors on the MW inverter inverter boards, CN701, 2. CN702, CN703, E701, to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc.

A. B. C. D. E. F. G. H.

CN702 Heat Sink E701 High-voltage output to mag magnet netron ron CN703 Control signal in/out CN701 120 V CA

H

G

D

F


B

A

C

E



The following individual circuits are for use in diagnosis, and are shown in the ON position. Do not continue with the diagnosis of the appliance if a fuse is blown, a circuit break er is tripped, or if there is less than a 240 volt power supply at the wall outlet.

OVEN STRIP CIRCUITS

BAKE PREHEA PREHEAT TB BAKE PREHEAT PREHEAT A BAKE SS

PAGE 14

N L2

L1 BK

BK

T4-4

R

T3-1

BU OUT BROIL 1450W

T3-4 T2-1 T2-2 T1-1 T1-2

FULL BROIL PREHEAT PREHEA TB

P8-1

W

M

BLOWER SPEED RESISTOR

L1

N L2

BK

T4-3

BU

T3-4 T1-1 T1-2 T2-1 T2-2 P8-4

BU OR IN BROIL 1800W OR R R/W R R/W BLOWER GY GY M

P8-1

BK

BK

T3-1

CONVECT BROIL PREHEAT PREHEA TA

T4-4

BK

T4-3

CONVECT BROIL SS BK

OVEN SHUTDOWN THERMAL CUTOFF (NON-RESETTABLE) (105°C) (221°F)

W


L1 BK

R

W

OUT BROIL 1450W

T3-1 T4-4

FULL BROIL SS SS

CONVECT BROIL PREHEAT PREHEA TB


BLOWER

GY

BK

BK

FULL BROIL PREHEAT PREHEA TA

R

BU OR IN BROIL 1800W OR R R/W R R/W

P8-4 GY BK

W

R

T3-3 T4-3

BK

BAKE 200W

P8-1

N L2

OUT BROIL 1450W

BU

T3-4 T1-1 T1-2 T2-1 T2-2

OR R R/W R R/W

P8-3

OR

P8-4

GY

W

IN BROIL 1800W

R

BU

OR

CONV. FAN M GY


W

BLOWER

W

M


R

W

L1

BREAD PROOF PREHEAT PREHEA TA

BK

BK

BAKE 200 2000W 0W R

T3-3

R

T1-1 T1-2

R R/W

P8-4 BK

GY

BLOWER

M

W

BLOWER SPEED RESISTO RESISTOR R

N T3-3

BAKE 2000W

R

BK

T4-3

T3-1

BU

BK

T4-4

T3-2 T2-1 T2-2 T1-1 T1-2 P8-3

Y

P8-4

GY

CONVECT BAKE SS

W

BK

R

GY

P8-1

L1 BK

OVEN SHUTDOWN THERMAL CUTOFF (NON-RESETTABLE) (105°C) (105° C) (221° (221°F) F)

T4-3

BREAD PROOF SS

CONVECT BAKE PREHEAT PREHEA TA

L2

N

BREAD PROOF PREHEAT PREHEA TB

P8-1

R

L2

W

R OVEN

OUT BROIL 1450W CONV.. RING 1600W BU CONV

R R/W R R/W OR

Y R

SHUTDOWN THERMAL CUTOFF (NON-RESETTABLE) (105°C) (221°F)

R M

CONV. FAN

W

BLOWER

M

W





The following individual circuits are for use in diagnosis, and are shown in the ON position. Do not continue with the diagnosis of the appliance if a fuse is blown, a circuit break er is tripped, or if there is less than a 240 volt power supply at the wall outlet.

OVEN STRIP CIRCUITS

CONVECT BAKE PREHEAT PREHEA TB

PAGE 15

L1 BK

BK

CONVECT ROAST PREHEAT PREHEA TB

T4-4

CONVECT ROAST PREHEAT PREHEA TA CONVECT ROAST SS P8-1

BK

BU

T3-3

R

BU

T1-1 T1-2 T2-1 T2-2 P8-3 P8-4

GY

GY

L2 OVEN

R SHUTDOWN

W

BAKE 2000W

R OR IN BROIL 1800W OR R R/W R R/W CONV. FAN OR M

T3-4

T4-3

BK

T3-1

N

OUT BROIL 1450W

THERMAL CUTOFF (NON-RESETTABLE) (105°C) (221°F)

R R W

BLOWER M

W


INNER BROIL PREHEAT PREHEA TB

L1 BK

T4-3

BK

INNER BROIL PREHEAT PREHEA TA BK

INNER BROIL SS SS

DEHYDRATE DEHYDRATE PREHEAT PREHEA T SS

T3-4

OR

T1-1 T1-2

R R/W

P8-4

GY

P8-1

N L2

IN BROIL 1800W

GY

BLOWER

W

M

N CONV. RING CONV. 1600W

BK BK

T4-4

P8-1

BK



L1

DEHYDRATE DEHYDRATE PREHEAT PREHEA TA

R

W

OR

T3-2

Y

T2-1 T2-2

R R/W

P8-3

OR

P8-4

GY

L2

W

R

Y R CONV.. FAN CONV

W

M GY


BLOWER

W

M

BLOWER SPEED SPEE D RESIS RESISTOR TOR BR

CLEAN

N W

DOOR SWIT SWITCH CH (ON LA LATCH TCH ASSY)

L1 BK

BR

OR

BU

T

LATCH SWITCH LATCH (OPERA (OPE RATED TED BY MOTO MOTOR) R)

BK BK

P1-5 P1-7

P1-4 T4-3 T4-4

BK

P9-5 P8-1

BK

BAKEE 200 BAK 2000W 0W

R

T3-1

1450W 0W BUOUTBROIL 145 BU BROIL IL 180 1800W 0W OR IN BRO OR

T3-4 T1-1 T1-2 T2-1 T2-2 P9-2

R R/W R R/W GY

N L2

R

T3-3

W

R

R R M


W

BLOWER

W

W

M MOTOR LA LATCH TCH


P8-5



MWO ST MWO STRI RIP P CIRCUITS MWO FULL POWER MWO VARIABLE POWER

PAGE 16

The following individual circuits are for use in diagnosis, and are shown in the ON position. Do not continue with the diagnosis of the appliance if a fuse is blown, a circuit break er is tripped, or if there is less than a 240 volt power supply at the wall outlet. L1 BK

MW APPLIANCE MANAGER

LINE FILTER L1 BK

BK

P33

P32

BR BK

BK

BR

P1-1


W CAVITY LINE FILTER L1 THERMOSTAT BU W W W P1-2 P31 P34

P2-5

P2-6

MONITOR 20A FUSE

LINE 20A FUSE

N


HALOGEN LIGHT BK M P2-4 BK P2-3 MAGNETRON FAN MOTOR

MWO STEAM

BR

BR P2-1 M TURNTABLE

P2-2

BR

BU P3-1

Y

4

1

Y

4903

2

BU

1

PRIMARY INTERLOCK SWITCH

CN702

P8-2 P4

P8-1

4

E 7 0 1

C N 7 0 1

P8-3

HUMIDITY SENSOR

MAGNETRON THERMOSTAT W 1020 W

F

C N 7 0 3

1 SECONDARY INTERLOCK SWITCH

MAGNETRON

FA

MW INVERTER

MWO CRISP

L2 L1 R BK


LINE FILTER L1 BK

BK

LINE 20A FUSE

P32

P33

BK BR

BR BK

P1-1


P2-5

P2-6

MONITOR 20A FUSE

N


W CAVITY LINE FILTER L1 THERMOSTAT BU W W W P1-2 P31 P34

HALOGEN LIGHT BK M P2-4 BK P2-3 MAGNETRON FAN MOTOR BR P2-1 M TURNTABLE

P2-2

BR

BU

BR

P3-1

Y PRIMARY INTERLOCK SWITCH 1 4 Y

4903

2

CN702

BU

1 P8-3

P6

P8-1

C N 7 0 3

LINE FILTER L2 R

1

3

R

4904

BK

L2 L1 R BK


LINE FILTER L1 BK

BK

P32

P33

BR BK

BR

MONITOR 20A FUSE

LINE 20A FUSE

P1-1

F

MAGNETRON

FA LINE FILTER L2

BK

BK

4

2

GRILL THERMOSTAT

GRILL ELEMENT 1600W

MWO EASY CONVECT

4 1 SECONDARY INTERLOCK SWITCH

E 7 0 1

C N 7 0 1

P8-2 ° t

MAGNETRON THERMOSTAT W 1020 W

N


CONV. THERMOACTUATOR

P2-7 M CONVECTION FAN MOTOR

P2-8

P1-2

CAVITY LINE FILTER L1 THERMOSTAT BU

W

W

W

P31 W

P34


P2-6

P2-5 BU

BR HALOGEN LIGHT BK BK P2-3 M P2-4 MAGNETRON FAN MOTOR BR P2-1 M P2-2 BR TURNTABLE

4905

Y P3-1 4 1 SECONDARY INTERLOCK SWITCH

BU

1020

W

BU

CONV. 1200W

P6

° t

LINE FILTER L2 R

1

3

LINE FILTER L2 R

4904

BK

BK GRILL ELEMENT 1600W

BK

4

2

GRILL THERMOSTAT

PART NO. 8304098 REV. B Technical Service Data. NOTE: This sheet contains important Technical FOR SERVICE TECHNICIAN ONLY DO NOT REMOVE OR DESTROY

01/07



KEMS308SSS00 Tech Sheet - 8304098 - Rev B.pdf

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