tech-sheet-8301821
TECH SHEET – DO NOT DISCARD PAGE 1

WARNING PRECAUTIONS TO BE OBSERVED BEFORE AND Electrical Shock Hazard DURING SERVICING TO Disconnect power before servicing. AVOID POSSIBLE

Replace all parts and panels before EXPOSURE TO EXCESSIVE operating. MICROWAVE ENERGY

Failure to do so can result in death or a. Do not operate or allow the oven to be electrical shock. operated with the door open.

Electrostatic Discharge (ESD) b. Make the following safety checks on all ovens to Sensitive Electronics be serviced before activating the magnetron or other microwave source, and make repairs as ESD problems are present everywhere. ESD may necessary: damage or weaken the electronic control assembly. The new control assembly may appear to work well 1. Interlock Operation after repair is finished, but failure may occur at a later date due to ESD stress. 2. Proper Door Closing

Use an anti-static wrist strap. Connect wrist 3. Seal and Sealing Surfaces strap to green ground connection point or (Arcing, Wear & Other Damage) unpainted metal in the appliance – OR – touch your finger repeatedly to a green ground 4. Damage to or Loosening of connection point or unpainted metal in the Hinges & Latches appliance. 5. Evidence of Dropping or Abuse Before removing the part from its package, touch the anti-static bag to a green ground connection c. Before turning on microwave power for any point or unpainted metal in the appliance. service test or inspection within the microwave generating compartments, check the Avoid touching electronic parts or terminal magnetron, waveguide or transmission line and contacts; handle electronic control assembly by cavity for proper alignment, integrity and edges only. connections.

When repackaging failed electronic control d. Any defective or misadjusted components in the assembly in anti-static bag, observe above interlock, monitor, door seal, and microwave instructions. generation, and transmission systems shall be repaired, replaced, or adjusted by DIAGNOSTICS procedures described in service manual before the oven is released to the owner. Is oven in “Sabbath Mode”? If so, “SAB” will appear in digital display. Press and hold “6” key for 5 seconds to e. A microwave leakage check to verify end Sabbath Mode. compliance with the Federal performance standard should be performed on each oven Disconnect power and perform the following checks: prior to release to the owner.

The most common cause for control failure is f. Do not attempt to operate the oven if the door corrosion on connectors. Therefore, disconnecting glass is broken. and reconnecting wires will be necessary throughout test procedures. PROBLEM: Bake Temperature Needs Adjustment Check all connections before replacing components, looking for broken or loose wires, 1. Press BAKE pad for 5 seconds. The default temp. 0° failed terminals, or wires not pressed into or a previously entered offset temp. will show in the connectors far enough. Temp. Display.

All tests/checks should be made with a VOM or n Press the BAKE pad to increase the DVM having a sensitivity of 20,000 ohms per volt temperature in 5° F or 3° C increments. DC or greater. n Press the BROIL pad to decrease the temperature Resistance checks must be made with power cord in 5° F or 3° C increments. unplugged from outlet, and with wiring harness or connectors disconnected. Maximum offset temperature adjustment is ±35° F or ±21° C.

2. Press the START pad to save the temp. adjustment.

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8301821

PAGE 2 TECH SHEET – DO NOT DISCARD

FAILURE/ERROR DISPLAY CODES Upon replacement, immediately return old electronic oven control using the mailing label supplied with each new NOTES: control. Always disconnect power before touching internal parts of The Failure code shows up in the display. the oven!

FAULT ERROR MEANING OF RECOMMENDED REPAIR PROCEDURE CODE CODE FAILURE CODE

F0 E0 Default F code – no failure Will only be displayed if user presses and holds the UPPER OFF key for 5 seconds and there is F1 no pre-existing fault. Press CANCEL to clear display. F2 E0, E1, & E2 Electronic control malfunction Check oven door switch. If okay replace control. F3 E3, E4, & E5 Electronic control malfunction Replace control. F4 F5 E0 or E1 Keypad keytail not connected F6 E3 1. Check keypad connector for firm connection.

F8 Key held down too long, or key is 2. Press CANCEL. If error code returns after 60 sec., replace keypad. shorted

E0 Temperature sensor opened 1. Check lower cavity sensor connection. (lower cavity) 2. Measure sensor resistance (1080 at 70° F [21° C]. Add 2 per degree F). 3. If resistance is not valid replace sensor. E1 Temperature sensor shorted 4. If sensor resistance and connections are good, then the oven cavity temperature must have (lower cavity) exceeded a safe level. Check for welded-closed relays on the control.

E2 Temperature sensor opened 1. Check microwave sensor connection. (microwave) 2. Measure sensor resistance (280k at 70° F [21° C]; 1k at 392° F [200° C]). 3. If resistance is not valid replace sensor. E3 Temperature sensor shorted 4. If sensor resistance and connections are good, then the oven cavity temperature must have (microwave) exceeded a safe level. Check for welded-closed relays on the control.

E0 Meat probe shorted 1. Disconnect meat probe and measure probe resistance (78k at 60° F [16° C], 37k at 90° F [32° C]).

2. If resistance is not valid replace probe. 3. Insert probe and check for a firm connection between probe and jack (in oven cavity). 4. Check connection between jack and harness (in rear of oven).

E0 Lower cavity over temperature See F3 Error Code E0 (above). while cleaning

E0 Lower cavity over temperature See F3 Error Code E0 (above). during cooking

E1 Microwave cavity over temperature See F3 Error Code E2 (above). during cooking

E0 Self-clean latch will not lock 1. Check the latch assembly: Check latch arm pivot joint, arm/motor connection, plunger and hook

E1 Self-clean latch will not unlock springs. 2. Check the Latch Motor:

E2 Oven over temperature while door – Check for firm electrical connections. open and latch lock – Disconnect the two wires from the motor and measure the resistance of the motor.

E3 Oven over temperature while door The resistance should be approximately 2450 . If the motor is open ( ) or shorted (0 ), it open and latch unlock should be replaced.

3. Check the Latch Switch. Disconnect it and use a continuity tester:

– Door latched = switch closed, continuity should read 0 .

– Door unlatched = switch open, continuity should read .

E4 Oven over temperature while door 4. Check Door Open/Closed Switch. Disconnect it and use a continuity tester:

close and latch unlock – Door open = switch closed, continuity should read 0 .

– Door closed = switch open, continuity should read .

5. Check power and element connections.

Fahrenheit (° F) to Celsius (° C) Conversion temperature stabilizes.

The default is Fahrenheit (° F). 2. Place the cup of water in the center of the oven. Operate on HIGH for 60 seconds. 1. Press the BROIL pad for 5 seconds. The temperature will be displayed in degrees Celsius indicated by the “C” in the 3. Stir the thermometer through the water and record the temperature display. maximum temperature.

2. To return the display to degrees Fahrenheit press the 4. Subtract the cold water temperature from the hot water BROIL pad again for 5 seconds. “F” will show in the temperature. The normal result should be a 20 – 38° F temperature display. (11.1 – 21.1° C) rise in temperature.

Microwave Oven Power Output Test NOTE: Less than a 20° F (11.1° C) temperature rise may indicate an operating voltage of less than 110 VAC or a low The power output of the magnetron can be measured by the power output from the magnetron. Cooking time can be following test: (for accurate results, the line voltage must be adjusted to compensate for either circumstance. Replace the 120 VAC and the oven cavity must be clean) magnetron only if the water temperature rise indicates a power output well beyond the normal result. 1. Fill a glass measuring cup with 16 oz. (453cc) of tap water. Stir the thermometer through the water until the

PART NO. 8301821 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 3

WIRE HARNESS SCHEMATIC T.O.D. (RESETABLE) LIGHT HEATING ELEMENT NOTES: When replacing the electronic control, be sure to attach the THERMAL FUSE/T.O.D. AC DRIVE cavity select line to the proper terminal (see “CAVITY SIZE” (NON-RESETABLE ONE TIME) MOTOR SOLENOID table below). RELAY COIL GROUND (CHASSIS) ENCLOSED Dots indicate connections or splices. RELAY THERMISTOR PLUG WITH CONTACTS Circuit shown in STANDBY/OFF mode with microwave oven FEMALE CONNECTOR OPERATED door and lower oven door open. BY DOOR RECEPTACLE WITH MALE CONNECTOR

BR LIGHT POWER SUPPLY

N L1 DOOR ELECTRONIC CONTROL J1-5 BK GND N L2 L1 SW R P8-2 HALOGEN W MICROWAVE BK CAVITY R R CAVITY LIGHT MAGNETRON R T.O.D. BR P10-1 P8-1 T.O.D. 20A J1-1 BK TAN R BK P10-4 R FUSE BK BU TO 3 15A PRIMARY P10-2 BU R M~ BR BK FUSE INTERLOCK MONITOR 4 1 SWITCH BK BU TURNTABLE GN Y M~ GY P17-1 N Y P17-2 2 CONTROL MAGNETRON FAN MAIN FILTER TRANSFORMER TAN P17-3 BU WW TAN P17-4 MAGNETRON VT P17-5 MONITOR 900W SWITCH ELECTRONIC FILTER VT SECONDARY OUTPUT WP #4451934 BK INTERLOCK SWITCH FROM L1 P17-6 PRIMARY J1-4 BU INTERLOCK N W P17-8 SWITCH

P17-10

W W W

P10-3 M~ GY YY Y CONVECTION FAN

CONVECTION BU/R R P14-1 AIR VENT 120VAC GY J1-2 W t° P14-2 P8-3 BR SOLENOID BR W TEMP SENSOR CONVECTION 280k @ 70°F/21.1°C BU/R W CONVECTION CONVECTION -1500W MWO ONLY P8-4 T.O.D. GY J1-7 R

P9-3 BK W W

0.6A BU GRILL T.O.D. GRILL – 1200W J1-6 R P9-1 R

MICROWAVE BK P15-1 J1-3 LOWER OVEN P15-5 W M~ UPPER BLOWER TEMP SENSOR t° W V/W P5-8 P7-6 VT W 1080 @ 70°F/21.1°C W V/W P5-9 M~ W MEAT PROBE 78k @ 60°F/15.5°C W Y P5-4 P7-5 GY/W LOWER

+5V SWITCH PULSE t° W Y P5-5 Y BLOWER 120 VAC W DOOR SWITCH 1 M~ TAN P5-1 P7-3 LIGHT POWER SUPPLY ON LATCH DOOR LOCK MOTOR LATCH BK W

TAN OR ASSY P5-3 P7-2 HALOGEN

BR BR BK BK BK 5W/BULB LATCH RELAY W CAVITY SIZE OR/W W W CONVECTION FAN TAN Y 30″ POLE 1 P7-7 OPEN 27″ TAN TAN BU BU P5-6 Y M~ W Y P5-10 CAVITY SIZE TAN P3-4 “CV” NO Y CONV – 1600W Y “CV” NO R OVEN SHUTDOWN SELECT R THERMAL FUSE BK P7-1 P2-4 BK BU NO RELAY “CV” NO R R BAKE – 2000W R “B” P3-3 P2-1 “B” R BK OR RELAY “B” THERMAL SWITCH P2-3 P3-1 “OB” NO OUT BROIL – 1000W “OB” NO LATCH SWITCH 1 RELAY CONTACTS BK P5-7 R 316°C (600°F) (OPERATED BY GN P15-3 “NC” MOTOR) P3-2 GN

A B POLE 1 BU BU BK/W W WW

C D POLE 2 RELAY “OB” “C”

“IB” NO IN BROIL – 1667W “IB” NO R “NO”

LATCH RELAY POLE 2 W

LATCH RELAY COIL OR OR BK/W C D

N RELAY LOGIC LOWER OVEN BK RELAY “IB”

RELAY LOGIC KEY ILUCBCROOMNOPAOVEOUOPBLWKNTTNLEEAVRETVOBRYROERIRFSBLBLALOLERINOEOLMLWWAEEYRR LURCCGMMIPEARAOOGIPLNNGGLHE.ALVVTFRYAFSBANLNOWER – OFF MODES RELAY LOGIC MICROWAVE OVEN – ON – CYCLING (MAX. PERIOD = 23 SEC.) OFF MODES – CYCLING (MAX. PERIOD = 90 SEC.) BAKE – CYCLING (MAX. PERIOD = 60 SEC.) ECONO BROIL MICRO. FULL PWR – ON OR OFF MAXI BROIL MICRO. VAR. PWR – PULSED FOR LOCK/UNLOCK PHASE CONV BROIL BROIL CONV ROAST MANUAL CRISP CONV BAKE OFF CLEAN CONV. QUICK PREHEAT PREHEAT-BAKE CONV. COOK PREHEAT-CONV ULTIMA COOK PREHEAT-CLEAN DEHYDRATE RAISING BREAD

IF LOWER OVEN IS IN CLEAN MODE, MICROWAVE WILL NOT FUNCTION

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8301821

PAGE 4 TECH SHEET – DO NOT DISCARD

STRIP CIRCUITS The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses.

BAKE AND PREHEAT-BAKE (OVEN) CONVECTION BAKE (OVEN)

L1 BAKE – OVEN N L2 L1 L1 CONVECTION FAN N L2 L1 BK P2-3 R BK P7-1 R P2-4 R “B” NO 2000W “B” NO R SHUTDOWN P7-7 OR P2-1 BU R R THERMAL OVEN FUSE SHUTDOWN RELAY “B” THERMAL “CV” NO FUSE OUT BROIL – “CV” NO CONV. – “OB” NO 1000W “OB” NO R THERMAL SWITCH Y 1600W YR

BU BU 316°C (600°F) P3-4 Y

RELAY “OB” W “NC” BK P3-3 P2-4 R THERMAL SWITCH W BK P2-3 P7-6 VT 316°C (600°F) BK/W “C” RELAY “CV” R BK/W “NO” “NC” IN BROIL – W W W “IB” NO 1667W “IB” NO BAKE – BK/W “C” “NO” CD “B” NO 2000W “B” NO OR OR LATCH RELAY POLE 2 R BK/W C W D R R P3-1 OR RELAY “IB” RELAY “B” LATCH RELAY P7-6 VT BK P3-2 BK INNER BROIL PREHEAT ONLY BK POLE 2 BK P7-1 W W BK BK

W W

P7-5 GY UPPER BLOWER P7-5 GY UPPER BLOWER W

P7-2 LIGHT POWER SUPPLY LOWER BLOWER P7-2 LIGHT POWER SUPPLY LOWER BLOWER W

BK HALOGEN BK HALOGEN

BK BK 5W/BULB BK BK 5W/BULB

W W W W

ECONO BROIL (OVEN) CONVECTION BROIL (OVEN)

L1 OVEN N L2 L1 L1 P7-7 OR CONVECTION FAN N L2 L1 BK P3-2 R BK P7-1 W SHUTDOWN R OR “IB” NO IN BROIL – THERMAL OVEN 1667W “IB” NO FUSE P3-1 SHUTDOWN

OR OR R “OB” OUT BROIL – THERMAL NO 1000W “OB” NO FUSE

THERMAL SWITCH P2-1 BU BU BU R 316°C (600°F) BK P2-3 THERMAL SWITCH BK/W W “NC” BK P3-2 RELAY “OB” 316°C (600°F) W “C” R BK/W W “NC” RELAY “IB” “NO” W BK IN BROIL – BK/W W “IB” NO 1667W “IB” NO “C” “NO”

CD BK/W W

LATCH RELAY P3-1 OR OR OR CD RELAY “IB” POLE 2 BK LATCH RELAY

BK POLE 2 BK P7-6 VT P7-6 VT W W

P7-5 GY UPPER BLOWER W P7-5 GY UPPER BLOWER W

BK P7-1 LIGHT POWER SUPPLY LOWER BLOWER LIGHT POWER SUPPLY LOWER BLOWER W P7-2 W P7-2

BK HALOGEN BK HALOGEN

BK BK 5W/BULB BK BK 5W/BULB

W W W W

MAXI BROIL (OVEN) CONVECTION ROAST AND PREHEAT CONVECTION (OVEN) L1 OVEN SHUTDOWN N L2 L1 OUT BROIL – THERMAL L1 CONVECTION FAN N L2 L1 BK P7-1 W “OB” NO 1000W “OB” NO FUSE P7-7 OR R R OVEN

BU BU R P2-4 R BAKE – SHUTDOWN

“B” NO 2000W “B” NO THERMAL

RELAY “OB” R RELAY “B” R R FUSE

P2-1 BU

BK P2-3 IN BK P2-3 P2-1 BU OUT BROIL – THERMAL SWITCH BK P3-2 BROIL – BK P3-2 P3-1 OR “OB” NO 1000W “OB” NO R 316°C (600°F) BK P7-1 1667W “IB” NO “IB” NO R THERMAL SWITCH BU BU “NC” 316°C (600°F) RELAY “OB” BK/W W W

OR OR BK/W W “NC” “C” “NO” BK/W W W IN BROIL – “IB” NO 1667W “IB” NO R C D P3-1 OR “C” “NO” P7-6 VT RELAY “IB” BK/W W OR OR LATCH RELAY POLE 2 BK CD RELAY “IB” LATCH RELAY BK POLE 2 BK BK

W

P7-5 GY UPPER BLOWER P7-6 VT W

W P7-5 GY UPPER BLOWER W

P7-2 LIGHT POWER SUPPLY LOWER BLOWER

W P7-2 LIGHT POWER SUPPLY LOWER BLOWER W BK HALOGEN

BK BK 5W/BULB BK HALOGEN

W W BK BK 5W/BULB

W W

PART NO. 8301821 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 5

CLEAN (OVEN)

TEMP SENSOR W V/W P5-8 P7-3 Y DOOR LOCK M~ N L2 L1 1080 @ 70°F/21.1°C t° W MOTOR LATCH W V/W 120 VAC R P5-9

RETURN LINE MUST BE CONNECTED TAN P5-1 “B” NO BAKE – 2000W “B” NO OVEN SHUTDOWN +5V SWITCH PULSE THERMAL FUSE DOOR SWITCH 1 ON LATCH ASSY R R R

TAN OR BR BR P5-3 RELAY “B”

LATCH RELAY POLE 1 BU “OB” NO OUT BROIL – 1000W “OB” NO THERMAL SWITCH 316°C (600°F) TAN TAN BU P5-6 R

L1 CAVITY SIZE TAN Y BU BU “NC” P5-10 W SELECT P2-4 R BK/W W P2-3 P2-1 BU RELAY “OB” “C” “NO”

BK “IB” NO IN BROIL – 1667W “IB” NO

R LATCH RELAY POLE 2

OR OR BK/W W

P3-1 OR RELAY “IB” CD

BK P3-2 BK BK

P7-6 VT M~ W

P7-5 GY UPPER BLOWER W

BK P7-1 P7-2 LIGHT POWER SUPPLY M~

LATCH SWITCH 1 RELAY CONTACTS LOWER BLOWER W (OPERATED BY A BK HALOGEN MOTOR) B POLE 1 BK BK 5W/BULB C D POLE 2 W W

LATCH RELAY COIL N

FULL POWER / VARIABLE POWER LIGHT POWER SUPPLY N (MICROWAVE) BK W P10-1 BR J1-5 HALOGEN P10-2 BU MICROWAVE MAGNETRON FAN R CAVITY LIGHT R W L1 BK P10-4 M~ GY W W DOOR SHOWN R MONITOR IN CLOSED SWITCH POSITION BR M~

TURNTABLE

BK CAVITY HIGH VOLTAGE SECONDARY SYSTEM INTERLOCK 20A T.O.D. MAGNETRON BU SWITCH FUSE P8-2 R T.O.D. R 900W OUTPUT W BK J1-1 BK TAN R

1 BK 15A PRIMARY BK P8-1 GN INTERLOCK SWITCH BK P7-1 FUSE

34 W J1-4

MAIN 2 W

FILTER P7-6 VT M~ UPPER BLOWER

MANUAL CRISP LIGHT POWER SUPPLY N L2 (MICROWAVE) P10-1 BR W P10-2 BU J1-5 BK HALOGEN MICROWAVE L1 MAGNETRON FAN R CAVITY LIGHT R DOOR SHOWN BK P10-4 M~ GY W IN CLOSED MONITOR W POSITION R BR SWITCH W W M~ R

TURNTABLE

BK CAVITY MAGNETRON HIGH VOLTAGE SECONDARY P8-2 R T.O.D. R SYSTEM INTERLOCK 20A T.O.D. BU SWITCH FUSE 900W OUTPUT W BK J1-1 BK TAN R

1 15A PRIMARY BK P8-1 GN BK FUSE INTERLOCK SWITCH 3 W J1-4 4

MAIN 2 W

FILTER P7-6 VT M~ P9-3 BU GRILL T.O.D. GRILL – 1200W W UPPER BLOWER J1-6 BK P7-1 BK J1-3 P9-1 R

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8301821

PAGE 6 TECH SHEET – DO NOT DISCARD

STRIP CIRCUITS The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses.

CONVECT (MICROWAVE) LIGHT POWER SUPPLY N L2

L1 W

DOOR SHOWN HALOGEN MICROWAVE IN CLOSED P10-1 BR BK R CAVITY LIGHT P10-2 BU J1-5 R POSITION J1-4 P10-3 Y MAGNETRON FAN

BK CAVITY BK P10-4 P8-3 BR M~ GY T.O.D. P8-4 GY 20A J1-1 BK TAN R P7-6 VT R BR MONITOR FUSE BK P9-3 BU M~ SWITCH 15A P9-1 R BK BK FUSE PRIMARY TURNTABLE INTERLOCK SWITCH GN 1 3 4 W W MAIN 2 W W FILTER Y CONVECTION FAN AIR VENT SOLENOID M~ GY

120VAC

CONVECTION BU/R R P14-1 Y GY TEMP SENSOR t° BU/R W P14-2 280k @ 70°F/21.1°C CONVECTION T.O.D. BR CONV – 1500W W J1-2 W

J1-7 R

BK P7-1 UPPER BLOWER W

M~

GRILL T.O.D. BK GRILL – 1200W W J1-6 W

J1-3 R

ULTIMA COOK LIGHT POWER SUPPLY N L2

L1 W

DOOR SHOWN P10-1 BR BK R HALOGEN IN CLOSED J1-5 R MICROWAVE POSITION P10-2 BU CAVITY LIGHT

P8-2 R MAGNETRON FAN J1-4 BK P10-4 M~ GY P10-3 Y P8-3 BR R TURNTABLE BR MONITOR P8-4 GY M~ SWITCH P9-3 BU BK CAVITY P9-1 R HIGH VOLTAGE SECONDARY P7-6 VT SYSTEM INTERLOCK 20A T.O.D. MAGNETRON SWITCH FUSE J1-1 BK TAN T.O.D. R 900W OUTPUT W R BK BU GN 1 PRIMARY BK P8-1 BK 15A INTERLOCK SWITCH FUSE 34 W W W MAIN 2 W FILTER Y CONVECTION FAN

AIR VENT SOLENOID 120VAC M~ GY Y GY BU/R R P14-1 CONVECTION t° BU/R W P14-2 BR W J1-2 W TEMP SENSOR 280k @ 70°F/21.1°C CONVECTION T.O.D. CONV – 1500W J1-7 R

BK W J1-6 W

GRILL T.O.D. GRILL – 1200W J1-3

R

BK P7-1 M~ W

UPPER BLOWER

BROIL (NO MICROWAVE ENERGY) N L2

L1 LIGHT POWER SUPPLY W DOOR SHOWN IN CLOSED P10-1 BR BK R HALOGEN POSITION P10-2 BU J1-5 R MICROWAVE CAVITY LIGHT J1-4 P7-6 VT MAGNETRON FAN P9-3 BU BK P10-4 P9-1 R M~ GY

BK CAVITY R MONITOR M~ SWITCH T.O.D. BR 20A J1-1 BK TAN R FUSE TURNTABLE BK 15A BK BK 34 W FUSE PRIMARY W INTERLOCK SWITCH GN 1

MAIN 2 W W FILTER UPPER BLOWER BK P7-1 W M~ GRILL J1-6 W T.O.D. BK GRILL-1200W W

J1-3 R

PART NO. 8301821 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 7

TESTING THE MICROWAVE OVEN COMPONENTS

COMPONENT TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER 1. Remove the leads from the terminals. Normal = Less than 1 . MAGNETRON Normal = Less than 1 . CAPACITOR 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = 0 . Primary Normal = Infinity. Secondary Normal = Infinity. Filament to Ground Normal = approximately 0 . 3. Measure resistance (Rx100). Primary Normal = Infinity. Filament Normal = Momentarily 1. Remove the leads from the terminals. indicates several ohms, and gradually returns to infinity. 2. Set the ohmmeter to Rx1 and touch the leads to the F and FA Normal = Infinity. terminals. Normal = Continuity. 3. Set the ohmmeter to Rx1k and measure filament to chassis. Abnormal = Infinity. Normal = Infinity. 1. Remove the leads from the terminals. Abnormal = Continuity.

2. Set the ohmmeter to Rx1k and touch the leads to the terminals. Normal = approximately 25 . Abnormal = Infinity. RECTIFIER 3. Terminal to chassis. 1. Remove the leads from the terminals. Normal = approximately 25 . 2. Set the ohmmeter to Rx1k and measure forward resistance. Abnormal = Infinity.

FAN MOTOR 3. Measure the reverse resistance. Normal = Continuity. NOTE: Some inexpensive meters may show infinity in both directions. Abnormal = Infinity. TURNTABLE 1. Remove the leads from the terminals. MOTOR 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = 14 for both bulbs. Normal = 7 for one bulb. 1. Remove the leads from the terminals. Abnormal = Infinity. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = approximately 1650 . THERMAL FUSES 1. Remove the leads from the terminals. Abnormal = Infinity.

2. Set the ohmmeter to Rx1 and touch the leads to the terminals.

Open Close

Cavity Grill and Magnetron Cavity Thermal Fuse 329° F (165° C) 284° F (140° C) 257° F (125° C) Thermal Convection Thermal Grill Thermal Fuse 320° F (160° C) 221° F (105° C)

Fuse Thermal Fuses Fuse Magnetron Thermal Fuse 293° F (145° C)

Convection Thermal Fuse 293° F (145° C)

GRILL ELEMENT 1. Remove the leads from the terminals.

Bulbs 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.

AIR VENT 1. Remove the lead from one terminal. SOLENOID 2. Set the ohmmeter to the Rx1k and touch the leads to the terminals.

MAIN FILTER 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. 34 Terminal 1 – Terminal 3 (coil) 1 2 Terminal 2 – Terminal 4 (coil) Normal = less than 1 . Terminal 3 – Terminal 4 (resistor) Normal = less than 1 . Normal = 660k – 700k .

Abnormal = Infinity.

OVEN SHUTDOWN THERMAL FUSE Thermal Fuse Opening Reclose Marking Part No. Temp. °F The oven shutdown thermal fuse Temp. °F (with Black Letters) is located at the back of the oven. It will shut down the elements if the 4452223 266°F ± 10°F Pink/Wht Stripe temperature at the back of the oven exceeds component limits. 4451442 248°F+18°F to 248°F – 0°F Yellow/Wht Stripe

Verify that the oven shutdown thermal fuse is OK. 4450934 338°F ± 11.7°F –31°F Red 4450334 275°F ± 11.7°F MAX Orange/Wht Stripe To replace this thermal fuse, refer to chart at right for 4450250 320°F ± 11.7°F correct part number. Blue

4450249 302°F ± 11.7°F Green/Wht Stripe

8300802 230°F+18°F to 230°F – 0°F Blue/Wht Stripe

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8301821

PAGE 8 TECH SHEET – DO NOT DISCARD

CAN BE TESTED COMPONENT LOCATIONS AT CONTROL PANEL COMPONENTS FRONT/TOP/REAR DBL Relays SERVICEABLE CHECK RESULTS Electronic Control Blower Motor Electronic POINTS (Behind Front Main Filter Filter Panel) (mounted on Electronic Control Front — — Terminal Block Tech L1 and Neutral) Electronic Filter Front — — Sheet

Control Transformer Front — —

Membrane Switch Front — — Latch Relay

Halogen Lights Light Bulb – Front — — Oven Light Transformer Light Assy. – Rear MW Light Latch Motor Front — — Membrane Transformer Switch Control Transformer DBL Relays Front — — 20 amp Microwave Fuse Latch Switch Relay Front — —

Latch Switch Front P5-6 (BU) to Door Unlocked =

P5-1 (TAN) Open Circuit Grill Element Halogen Convection Convection Assembly Light Fan Motor Thermal Door Locked = & Element Fuse Air Pressure on Back* Cavity Closed Circuit Relief Valve & Thermal Fuse

Door Switch Front P5-3 (BR) to Door Open = Secondary Grill Interlock Switch Thermal Fuse P5-1 (TAN) Closed Circuit

Door Closed =

Open Circuit

Oven Temperature Front P5-8 (V/W) to 1080 @ Sensor P5-9 (V/W) 70°F/21.1°C Rectifier

Meat Probe Sensor Probe – Front P5-4 (Y) to 78k @ 15-Amp Jack – Rear P5-5 (Y) 60°F/15.5°C Line Fuse

Lower Console Blower Rear P7-5 (GY/W) to 14 to 18

Neutral (W) Turntable High Voltage Motor Capacitor Cavity Light Transformer Front Primary Winding 40 to 45 Monitor Magnetron Secondary Winding Less than 1 Interlock Switch Thermal Fuse

Oven Shutdown Rear P2-4 (R) or P3-1 Closed Circuit Primary High Voltage Thermal Fuse Interlock Switch Transformer (OR) to Red Wire at Magnetron Cooling Fan Motor Terminal Block

Bake Element Rear P2-4 (R) to Red 25 to 30 Air Vent Solenoid Wire at Terminal

Block

Convection Fan Rear P7-7 (OR/W) to 18 Lower Console Oven Temperature Motor (Lower Oven) Blower Sensor (Rear) Neutral (W) Convection Door Latch Convection Ring Front P3-4 (Y) to Red 33 to 37 Ring Element Assembly (Operated by Element (Lower Oven) Wire at Terminal Convection Ring Motor Motor) Block 600°F Oven Broil Element – Outer Front P2-1 (BU) to Red 53 to 59 (316°C) Shutdown (Lower Oven) Thermal Thermal Fuse Wire at Terminal Switch (Rear Panel)

Block 600°F (316°C) Broil Element – Front P3-1 (OR) to Red 32 to 35 Temperature Bulb Inner (Lower Oven) in Cavity Wire at Terminal Halogen Block Lamp (Sides)

Microwave Light Front Primary Winding 40 to 45 Transformer (M/W) Secondary Winding Less than 1

All other microwave Rear — —

components

* Convection microwave only.

CONTROL TRANSFORMER

18 (P17-3) T

SEC 1 26 VAC

BK (P17-8) 8 17 (P17-4) T 16 (P17-2) Y

MANUFACTURED UNDER ONE OR MORE OF 120 VAC PRIMARY SEC 2 24 VAC THE FOLLOWING UNITED STATES PATENTS: 60 Hz 15 (P17-1) Y 14 (P17-6) V W (P17-10) 11

4,102,322 4,364,589 4,467,184 SEC 3 7.5 VAC

13 (P17-5) V

OTHER PATENTS PENDING

PART NO. 8301821 FOR SERVICE TECHNICIAN’S USE ONLY