tech-sheet-8304165
TECH SHEET – DO NOT DISCARD PAGE 1

WARNING PRECAUTIONS TO BE OBSERVED BEFORE AND Electrical Shock Hazard DURING SERVICING TO Disconnect power before servicing. Replace all parts and panels before operating. AVOID POSSIBLE Failure to do so can result in death or EXPOSURE TO EXCESSIVE electrical shock. MICROWAVE ENERGY Electrostatic Discharge (ESD) Sensitive Electronics a. Do not operate or allow the oven to be operated with the door open. ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control b. Make the following safety checks on all ovens to be assembly may appear to work well after repair is finished, serviced before activating the magnetron or other but failure may occur at a later date due to ESD stress. microwave source, and make repairs as necessary:

Use an anti-static wrist strap. Connect wrist strap to 1. Interlock Operation green ground connection point or unpainted metal in 2. Proper Door Closing the appliance – OR – touch your finger repeatedly to a 3. Seal and Sealing Surfaces green ground connection point or unpainted metal in the appliance. (Arcing, Wear & Other Damage) 4. Damage to or Loosening of Before removing the part from its package, touch the anti-static bag to a green ground connection point or Hinges & Latches unpainted metal in the appliance. 5. Evidence of Dropping or Abuse

Avoid touching electronic parts or terminal contacts; c. Before turning on microwave power for any service handle electronic control assembly by edges only. test or inspection within the microwave generating compartments, check the magnetron, waveguide or When repackaging failed electronic control transmission line and cavity for proper alignment, assembly in anti-static bag, observe above integrity and connections. instructions. d. Any failed or misadjusted components in the interlock, DIAGNOSTICS monitor, door seal, and microwave generation, and transmission systems shall be repaired, replaced, or Disconnect power and perform the following checks: adjusted by procedures described in service manual before the oven is released to the owner. A potential cause of a control not functioning is corrosion on connections. Observe connections and check for e. A microwave leakage check to verify compliance with continuity with an ohmmeter. the Federal performance standard should be performed on each oven prior to release to the owner. Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires f. Do not attempt to operate the oven if the door glass is not pressed into connectors far enough. broken.

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

Resistance checks must be made with power cord 1. Press BAKE pad for 5 seconds. The default temp. 0° or a unplugged from outlet, and with wiring harness or previously entered offset temp. will show in the Temp. connectors disconnected. Display.

Fahrenheit (° F) to Celsius (° C) Press the TEMP pad “up” arrow ( ) to increase the Conversion temperature in 10° F or 5° C increments.

The default is Fahrenheit (° F). Press the TEMP pad “down” arrow ( ) to decrease the temperature in 10° F or 5° C increments. 1. Press the BROIL pad for 5 seconds. The temperature will be displayed in degrees Celsius indicated by the “C” in the Maximum offset temperature adjustment is ±30° F or ±15° C. temperature display. 2. Press the START pad to save the temp. adjustment. 2. To return the display to degrees Fahrenheit press the BROIL pad again for 5 seconds. “F” will show in the temperature display.

4,852,544 5,175,413 THIS PRODUCT IS COVERED BY ONE OR MORE OF THE FOLLOWING PATENTS: 6,722,356 4,974,804 5,185,047 U.S. PATENT NOS. 6,734,403 5,008,516 5,321,229 6,784,404 5,064,998 5,349,162 5,422,460 5,571,434 5,808,278 5,910,265 5,983,888 6,087,944 6,263,782 6,403,929 6,663,009 6,841,761 5,138,137 5,378,874 5,424,512 5,620,623 5,810,576 5,918,589 6,008,478 6,097,000 6,349,717 6,437,294 6,666,676 6,870,138 5,142,125 5,382,552 5,438,180 5,694,916 5,813,320 5,924,857 6,017,211 6,111,231 6,363,971 6,509,551 6,693,262 6,904,969 5,441,036 5,749,388 5,841,112 5,928,543 6,035,848 6,163,017 6,375,150 6,545,251 6,698,417 5,491,314 5,756,970 5,856,654 5,961,311 6,043,461 6,201,222 6,392,204 6,570,136 6,698,923 5,571,433 5,767,488 5,881,710 5,967,634 6,079,756 6,232,584 6,394,081 6,614,006 6,700,101

AND OTHER PATENTS PENDING.

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8304165

PAGE 2 TECH SHEET – DO NOT DISCARD

Microwave Oven Power Output Test Programming the Cavity Size

The power output of the magnetron can be measured by the When replacing the electronic control, be sure to program the following test: (for accurate results, the line voltage must be 120 cavity size: VAC and the oven cavity must be clean). 1. Within 60 seconds of power up, press the following 1. Fill a glass measuring cup with 16 oz. (453cc) of tap water. touchpads: Stir the thermometer through the water until the temperature OVEN CANCEL, WARM HOLD, BAKE, TEMP DOWN, stabilizes. TIMER OFF, MINUTE DOWN, MICRO CANCEL, 5, OVEN START/ENTER, OVEN LIGHT. 2. Place the cup of water in the center of the oven. Operate on HIGH for 60 seconds. 2. Size is shown in display – “id: 30”.

3. Stir the thermometer through the water and record the 3. Press CLOCK pad until correct size is displayed. maximum temperature. 4. Press CANCEL. 4. Subtract the cold water temperature from the hot water temperature. The normal result should be a 20–38° F 5. Press and hold OVEN CANCEL pad for 5 seconds (11.1–21.1° C) rise in temperature. to verify programming.

NOTE: Less than a 20° F (11.1° C) temperature rise may indicate an operating voltage of less than 110 volts or a low power output from the magnetron. Cooking time can be adjusted to compensate for either circumstance. Replace the magnetron only if the water temperature rise indicates a power output well beyond the normal result.

RELAY LOGIC MICROWAVE OVEN CONTROL TRANSFORMER

PRIMARY

SECONDARY

RELAY LOGIC LOWER OVEN RED (P16-7) BU (P16-3) 20.3 VAC 120 VAC PRIMARY SEC BU (P16-2) 60 Hz

RED (P16-5)

NOTE: IF LOWER OVEN IS IN CLEAN MODE, FOR SERVICE TECHNICIAN’S USE ONLY MICROWAVE WILL NOT FUNCTION.

RELAY LOGIC KEY

PART NO. 8304165

TECH SHEET – DO NOT DISCARD PAGE 3

FAILURE/ERROR NOTES: DISPLAY CODES 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.

FAULT ERROR MEANING OF RECOMMENDED REPAIR PROCEDURE CODE CODE FAILURE CODE F0 F1 All E Default F code – no failure Will only be displayed if user presses and holds CANCEL key for 5 seconds and there are F2 Codes no pre-existing faults. Press CANCEL to clear display. Electronic control malfunction F3 E0 1. Disconnect power or unplug oven. E1 Key held down too long or key is shorted 2. Replace control. F5 E5, E6 Keypad keytail not connected 3. Reconnect power or plug in oven. E0 E1 CANCEL key drive line open 1. Disconnect power or unplug oven. E2 2. Check keypad connector for firm connection. E3 Temperature sensor opened 3. Reconnect power or plug in oven. R=2875 ohm (by spec) 4. Press CANCEL. If error code returns after 60 sec., go to step 5. E0 Temperature sensor shorted 5. Disconnect power or unplug oven. R=825 ohm (by spec) 6. Replace keypad. E1 Oven temp too high – over 575° F 7. Reconnect keypad to control. (302° C) in COOK mode 8. Reconnect power or plug in oven. Oven temp too high – over 950° F (510° C) in CLEAN mode 1. Disconnect power or unplug oven. 2. Check sensor connection. Door is open, but latch is locked 3. Measure sensor resistance (1080 Ω at 70° F [21° C]. Add 2 Ω per degree F.) (condition exists when door switch is 4. If resistance is not valid replace sensor. open indicating an open door, and 5. If sensor resistance and connections are good, then check for welded-closed relays on latch switch is closed indicating a locked door) the control. 6. Reconnect power or plug in oven. Self-clean latch will not lock/unlock 1. Disconnect power or unplug oven. 2. Check the latch assembly: latch arm pivot joint, arm/motor connection, plunger and

hook springs. 3. Check the Latch Motor:

– Check for firm electrical connections. – Disconnect the two wires from the motor and measure the resistance of the motor.

The resistance should be approximately 2450Ω. If the motor is open ( Ω) or shorted (0Ω), it should be replaced. 4. Check the Latch Switch. Disconnect it and use a continuity tester: – Door latched = switch closed, continuity should read 0Ω. – Door unlatched = switch open, continuity should read Ω. 5. Check Door Open/Closed Switch. Disconnect it and use a continuity tester: – Door open = switch open, continuity should read Ω. – Door closed = switch closed, continuity should read 0Ω. 6. Check Sister Board: – Check connections latch motor – sister board. – Replace sister board. 7. Check power and element connections. 8. Replace control. 9. Reconnect power or plug in oven.

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8304165

PAGE 4 TECH SHEET – DO NOT DISCARD

WIRE HARNESS SCHEMATIC T.O.D. (RESETTABLE) LIGHT HEATING ELEMENT NOTES: THERMAL FUSE/T.O.D. AC DRIVE (NONRESETTABLE ONE TIME) MOTOR ENCLOSED When replacing the electronic control, be sure to program RELAY COIL THERMISTOR the cavity size. See “Programming the Cavity Size” on GROUND (CHASSIS) page 2. RELAY OPERATED PLUG WITH CONTACTS BY DOOR Dots indicate connections or splices. FEMALE CONNECTOR Circuit shown in standby/off mode with microwave oven RECEPTACLE WITH door and lower oven door closed. MALE CONNECTOR

N L1

W LIGHT POWER SUPPLY ELECTRONIC FILTER – WP #8302143 N L2 L1 BK J1-5 HALOGEN BK W W MICROWAVE BR CAVITY LIGHT R R BK R ELECTRONIC CONTROL R

DOOR SWITCH

CAVITY BK P27-1 MAGNETRON T.O.D. T.O.D.

J1-1 BK TAN R P26-2 R R

15A PRIMARY BK BK P26-1 P27-2 BU R BR FUSE INTERLOCK P27-4 BU TO BU P29 TURNTABLE SWITCH MONITOR GY

W BK BK

4 32W MAGNETRON FAN G BU MAGNETRON 1 BK P28 MICROWAVE 900W MAIN FILTER DOOR SENSE BK OUTPUT CIRCUIT 20A FUSE BU P16-3 INTERLOCK WW SWITCH 2 BU P16-2

CONTROL POWER R P16-7 W MONITOR TRANSFORMER R P16-5 SWITCH W MICROWAVE BU FROM PRIMARY INTERLOCK SWITCH

LOWER BK P24-3 J1-4 OVEN P24-1 W

RETURN LINE MUST BE CONNECTED TAN P23-1 P24-6 V W W DOOR SWITCH (ON LATCH ASSEMBLY) W R TAN OR BR BR P23-2 P24-5 GY UPPER BLOWER

LATCH SWITCH INCANDESCENT LOWER BLOWER 15W/BULB

(OPERATED BY

MOTOR)

TAN TAN BU BU P23-3 P24-4 BK BK W BK W OVEN DOOR LOCK P25-1 MOTOR LATCH P25-2

SISTER BOARD

W M~ Y P2-1 P1-4 BU BK P2-2 P1-3 GY DOUBLE LINE R BREAK RELAY R

W V P23-4

TEMP SENSOR G P18-4 R BAKE-2000W R OVEN SHUTDOWN 1080Ω at 70°F (21°C ) BK P18-3 P18-1 OR BROIL-3000W 1654Ω at 350°F (177°C) THERMAL FUSE

R OR

BK P18-2

P16-1 G

PART NO. 8304165 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 5

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

BAKE AND PREHEAT-BAKE

R N L2 R P18-4 R R P18-1 OR DOUBLE LINE BREAK RELAY P24-5 GY

L1 BAKE-2000W R BROIL-3000W BK OR OVEN SHUTDOWN THERMAL FUSE W

LOWER BLOWER

BROIL R N L2 R L1 P18-1 OR R

BK DOUBLE LINE P24-5 GY BREAK RELAY

BROIL-3000W OR LOWER BLOWER OVEN SHUTDOWN THERMAL FUSE W

CLEAN

RETURN LINE MUST T BE CONNECTED P23-1

DOOR SWITCH (ON LATCH ASSEMBLY)

T OR BR BR P23-2 P23-3 N L1 LATCH SWITCH (OPERATED BY P25-1 T T P25-2 MOTOR)

BU BU

OVEN DOOR LOCK N L2 MOTOR LATCH R R SISTER BOARD

W M~ Y P2-1 P1-4 BU DOUBLE LINE R BREAK RELAY

BK P2-2 P1-3 GY

P18-4 R BAKE-2000W P18-1 R P24-5 BK

OR BROIL-3000W OR

OVEN

SHUTDOWN

GY THERMAL FUSE

W

LOWER BLOWER

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8304165

PAGE 6 TECH SHEET – DO NOT DISCARD

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

PREHEAT-CLEAN

RETURN LINE MUST T BE CONNECTED P23-1

DOOR SWITCH (ON LATCH ASSEMBLY)

T OR BR BR P23-2 P23-3 N L1 LATCH SWITCH (OPERATED BY P25-1 T T P25-2 MOTOR)

BU BU

OVEN DOOR LOCK N L2 MOTOR LATCH R R SISTER BOARD

W M~ Y P2-1 P1-4 BU DOUBLE LINE R BREAK RELAY

BK P2-2 P1-3 GY

P18-4 R BAKE-2000W R P18-1 BK P24-5

OR BROIL-3000W OR

OVEN

SHUTDOWN

GY THERMAL FUSE

W

LOWER BLOWER

MICROWAVE FULL POWER / VARIABLE POWER N

L1

LIGHT POWER SUPPLY

BK HALOGEN MICROWAVE P27-1 BK BR J1-5 R CAVITY LIGHT R

BK P27-4 MAGNETRON FAN

P27-2 BU

BU GY

DOOR SHOWN R MONITOR IN CLOSED TURNTABLE POSITION BR SWITCH W J1-4

PRIMARY HIGH VOLTAGE SECONDARY INTERLOCK BK CAVITY SYSTEM INTERLOCK T.O.D. SWITCH 20A BK 900W OUTPUT SWITCH FUSE J1-1 BK TAN R P26-1 P26-2 R R BU W BK 15A MAGNETRON BK FUSE P29 T.O.D. P28 1 3 W G 4

2W MICROWAVE DOOR SENSE MAIN FILTER CIRCUIT

BK P24-3 P24-6 V WW W W

UPPER BLOWER

PART NO. 8304165 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 7

ELECTRONIC COMPONENT KEY COMPONENT LOCATIONS

COMPONENT FRONT/TOP/ CAN BE TESTED Electronic Control Upper Blower Motor REAR AT CONTROL PANEL* (Behind Front Panel) Main Filter SERVICEABLE CHECK POINTS RESULTS Tech Electronic Filter Electronic Control Front — — Sheet mounted on

— — Terminal Block

Membrane Switch Front P23-2 (BR) to Door Open = P23-1 (TAN) Open Circuit Door Switch Front Door Closed = Sister Closed Circuit Board M/W Light Latch Switch Front P23-3 (BU) to Door Unlocked = Membrane Transformer Switch P23-1 (TAN) Open Circuit 20 amp Control Transformer Microwave Fuse Door Locked = Cavity Thermal Fuse Closed Circuit Halogen Light Rectifier Door Lock Motor Front On Sister Board 2500 Ω 15-Amp (with Door Closed) Line Fuse P2-1 (Y) to Neutral (W) Air Pressure High Voltage Relief Valve & Capacitor Oven Temperature Front P23-4 (VT) to 1080 Ω @ Magnetron Sensor P23-6 (VT) 70° F Secondary Thermal Fuse Interlock Switch High Voltage Lower Oven Blower Rear P24-5 (GY) to 14 Ω to 18 Ω Transformer Neutral (W) Magnetron

Incandescent Lights Light Bulb – Front — —

Light Assy. – Rear

Oven Shutdown Rear P18-1 (OR) to Closed Circuit Thermal Fuse Bake Element (R) Wire at Double Line Turntable (2000 Watt) Motor Broil Element Break Relay (3000 Watt) Monitor Control Power Front P18-4 (R) to 26 Ω to 30 Ω Interlock Switch Transformer (R) Wire at Double Line Primary Interlock Switch Break Relay Cooling Fan Motor Front P18-1 (OR) to 17 Ω to 20 Ω

(R) Wire at Double Line

Break Relay

Front Primary Wiring: 75 Ω to 95 Ω

P16-5 (R) to P16-7 (R)

Secondary Wiring: Less than 1 Ω P16-2 (BU) to P16-3 (BU)

Electronic Filter Rear — —

Sister Board Front P25-1 (BU) to Closed Circuit P1-4 (BU) and Upper Blower (M/W) Rear P25-2 (GY) to 10 Ω to 15 Ω 40 Ω to 45 Ω MWO Cavity Front P1-3 (GY) Less than 1 Ω Light Transformer P24-6 (VT) to Neutral (W)

Primary Winding

Secondary Winding

All Other Microwave Rear Components

* Short double line break relay red wire terminals fastons

OVEN SHUTDOWN THERMAL FUSE Thermal Fuse Opening Reclose Marking Part No. Temp. ° F Temp. ° F (with Black Letters) The oven shutdown thermal fuse is located at the back of the oven. 4452223 266°F ± 10°F –31° F Pink/Wht Stripe It will shut down the elements if the MAX Yellow/Wht Stripe temperature at the back of the oven 4451442 248°F+18°F to 248°F – 0°F exceeds component limits. Red 4450934 338°F ± 11.7°F Orange/Wht Stripe Verify that the oven shutdown thermal fuse is OK. 4450334 275°F ± 11.7°F Blue To replace this thermal fuse, refer to chart at right for correct part Green/Wht Stripe number. 4450250 320°F ± 11.7°F Blue/Wht Stripe

4450249 302°F ± 11.7°F

8300802 230°F+18°F to 230°F – 0°F

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 8304165

PAGE 8 TECH SHEET – DO NOT DISCARD

TESTING THE MICROWAVE OVEN COMPONENTS

COMPONENT TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER 1. Disconnect power or unplug oven. Normal = Less than 1 Ω. MAGNETRON 2. Remove the leads from the terminals. Normal = Less than 1 Ω. 3. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = 0 Ω. Normal = Infinity. Primary Normal = Infinity. Secondary Filament to Ground Normal = approximately 0 Ω. 4. Measure resistance (Rx100) Normal = Infinity. Primary Filament

1. Disconnect power or unplug oven. 2. Remove the leads from the terminals. 3. Set the ohmmeter to Rx1 and touch the leads to the F and FA

terminals. 4. Set the ohmmeter to Rx1k and measure filament to chassis.

CAPACITOR 1. Disconnect power or unplug oven. Normal = Momentarily RECTIFIER 2. Remove the leads from the terminals. indicates several ohms, and FAN MOTOR 3. Set the ohmmeter to Rx1k and touch the leads to the terminals. gradually returns to infinity. Normal = Infinity. 4. Terminal to chassis. 1. Disconnect power or unplug oven. Normal = Continuity. 2. Remove the leads from the terminals. Abnormal = Infinity. 3. Set the ohmmeter to Rx1k and measure forward resistance. Normal = Infinity. Abnormal = Continuity. 4. Measure the reverse resistance. Normal = approximately 25 Ω. NOTE: Some inexpensive meters may show infinity in both directions. Abnormal = Infinity. 1. Disconnect power or unplug oven. 2. Remove the leads from the terminals. 3. Set the ohmmeter to Rx1 and touch the leads to the terminals.

TURNTABLE MOTOR 1. Disconnect power or unplug oven. 2. Remove the leads from the terminals. 3. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = approximately 25 Ω. Abnormal = Infinity.

THERMAL FUSES 1. Disconnect power or unplug oven. Normal = Continuity. 2. Remove the leads from the terminals. Abnormal = Infinity. Cavity 3. Set the ohmmeter to Rx1 and touch the leads to the terminals. Thermal Fuse MAIN FILTER Open Close

Magnetron Cavity Thermal Fuse 329°F (165°C) Thermal Fuse Mag Thermal Fuse 293°F (145°C) 257°F (125°C)

34 1. Disconnect power or unplug oven.

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

Abnormal = Infinity.

PART NO. 8304165 FOR SERVICE TECHNICIAN’S USE ONLY 10/05