precautions to be observed before and during servicing to avoid ...
TECH SHEET - DO NOT DISCARD
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.
Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. ■
■
■
■
Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance - OR - touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance. Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only. When repackaging failed electronic control assembly in anti-static bag, observe above instructions.
DIAGNOSTICS Is oven in “Sabbath Mode”? If so, “SAB” will appear in digital display. Press and hold “6” key for 5 seconds to end Sabbath Mode. Disconnect power and perform the following checks: ■
■
■
■
The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout test procedures. Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 ohms per volt DC or greater. Resistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected.
PAGE 1
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: 1. Interlock Operation 2. Proper Door Closing 3. Seal and Sealing Surfaces (Arcing, Wear & Other Damage) 4. Damage to or Loosening of Hinges & Latches 5. Evidence of Dropping or Abuse c. Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line and cavity for proper alignment, integrity and connections. d. Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation, and transmission systems shall be repaired, replaced, or adjusted by procedures described in service manual before the oven is released to the owner. 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. f. Do not attempt to operate the oven if the door glass is broken.
PROBLEM: Bake Temperature Needs Adjustment 1. Press BAKE pad for 5 seconds. The default temp. 0° or a previously entered offset temp. will show in the Temp. Display. n
Press the BAKE pad to increase the temperature in 10° F or 5° C increments.
n
Press the BROIL pad to decrease the temperature in 10° F or 5° C increments. 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. 8300543 REV. E
PAGE 2
TECH SHEET - DO NOT DISCARD
FAILURE/ERROR DISPLAY CODES
■
NOTES: ■
Always disconnect power before touching internal parts of the oven! FAULT CODE
ERROR CODE
F0
E0
F1
F2
F3
F4
Default F code – no failure
E0, E1, & E2 Door switch malfunction E3 or E4
Electronic control malfunction
E0 or E1
Keypad not connected
E3
Key held down too long, or key is shorted
E0
Temperature sensor opened
E1
Temperature sensor shorted
E0
E0
F8
E1
All Other Codes
MEANING OF FAILURE CODE
Meat probe shorted
■
Upon replacement, immediately return old electronic oven control using the mailing label supplied with each new control. The Failure code shows up in the display.
RECOMMENDED REPAIR PROCEDURE Will only be displayed if user presses and holds the CANCEL key for 5 seconds and there is no pre-existing fault. Press CANCEL to clear display. Check oven door switch. If okay replace control. Replace control. 1. Check keypad connector for firm connection. 2. Press CANCEL. If error code returns after 60 sec., replace keypad. 1. 2. 3. 4.
Check sensor connection. Measure sensor resistance (1080Ω at 70° F. Add 2Ω per degree F). If resistance is not valid replace sensor. If sensor resistance and connections are good, then the oven cavity temperature must have exceeded a safe level. Check for welded-closed relays on the control.
1. 2. 3. 4.
Disconnect meat probe and measure probe resistance (78kΩ at 60° F, 37kΩ at 90° F). If resistance is not valid replace probe. Insert probe and check for a firm connection between probe and jack (in oven cavity). Check connection between jack and harness (in rear of oven).
1. Check the latch assembly: Check latch arm pivot joint, arm/solenoid connection, solenoid spring & and spring washer. 2. Check the Latch Solenoid: - Check for firm electrical connections. Self-clean latch will not lock - Disconnect the two wires from the solenoid and measure the resistance of the solenoid. A small resistance (approx. 300Ω) is normal. If the solenoid is open (∞Ω) or shorted (0Ω), it should be replaced. 3. 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. Self-clean latch will not unlock 4. Check Door Open/Closed Switch: Disconnect it and use a continuity tester: - Door open = switch closed, continuity should read 0Ω. - Door closed = switch open, continuity should read ∞Ω. 5. Finally, replace control. Electronic control malfunction
Replace control.
Fahrenheit (° F) to Celsius (° C) Conversion
1. Fill a glass measuring cup with 16 oz. (453cc) of tap water. Stir the thermometer through the water until the 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 temperature display.
3. Stir the thermometer through the water and record the maximum temperature.
2. To return the display to degrees Fahrenheit press the BROIL pad again for 5 seconds. “F” will show in the temperature display.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be a 20 - 38° F (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 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.
The power output of the magnetron can be measured by the following test: (for accurate results, the line voltage must be 120 VAC and the oven cavity must be clean).
PART NO. 8300543 REV. E
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 3
WIRE HARNESS SCHEMATIC
LIGHT
HEATING ELEMENT
AC DRIVE MOTOR
SOLENOID
PLUG WITH FEMALE CONNECTOR
RELAY COIL
ENCLOSED THERMISTOR
RECEPTACLE WITH MALE CONNECTOR
RELAY CONTACTS
OPERATED BY DOOR
T.O.D. (RESETABLE) THERMAL FUSE/T.O.D. (NON-RESETABLE ONE TIME)
NOTES: When replacing the electronic control, be sure to attach the cavity select line to the proper terminal (see “CAVITY SIZE” table below). Dots indicate connections or splices. Circuit shown in STANDBY/OFF mode with microwave oven door and lower oven door open.
GROUND (CHASSIS)
BR
ELECTRONIC CONTROL
L1
DOOR SW BK
P8-2
CAVITY T.O.D. TAN
J1-1 BK
20A FUSE BK
15A FUSE
BK 1
3
GN
BR R
TO MONITOR
L1 N
HALOGEN MICROWAVE CAVITY LIGHT
R
W
R
R P8-1 P10-2
BU
R
TURNTABLE GY
M ~
P17-1
BR
M ~
P10-4
Y P17-2 TAN P17-3 TAN P17-4 VT P17-5 VT P17-6 BK W P17-8 P17-10
CONTROL TRANSFORMER
MAIN FILTER
P10-1
BU Y
N 2
R MAGNETRON T.O.D.
MAGNETRON FAN W
BU
W
SECONDARY INTERLOCK SWITCH
FROM PRIMARY INTERLOCK SWITCH
BU
J1-4
W
MAGNETRON 900W OUTPUT
MONITOR SWITCH
W
W P10-3
Y
Y
t°
BU/R
R W
P8-3 BR P14-2
P5-8
W Y W Y
P5-4
TAN ON LATCH ASSY BR BR LATCH RELAY POLE 1 BU TAN BU
P5-1
W t° W
MEAT PROBE 78k Ω @ 60°F/15.5°C
t°
+5V SWITCH PULSE DOOR SWITCH 1 TAN OR
CAVITY SIZE TAN SELECT
P5-9
P5-5
P15-5
W
P7-6
VT
PULSE RELAY
LOCK UNLOCK P7-3
Y BK
P7-2 BK
P5-6
P7-7
P5-10
P3-4
Y
"CV"
"B"
– PULSED FOR 1/2 SECOND
NO
W
Y CONV - 1600W Y
W
"CV" NO
M ~ R
RELAY "CV" "B" R BAKE - 2000W R
NO
W
OVEN SHUTDOWN THERMAL FUSE R
R
OR RELAY "B"
P3-1 "OB"
P15-3 GN
RE LAY BA S KE IN B R OU OIL TB CO ROIL NV CO ELEM NV OV FAN LT LOW ER B PU LS LOWE LO E REL R CK AY / UPP UNLO C ER BLO K WE R
RELAY LOGIC LOWER OVEN
MODES
W
CONVECTION FAN
W
NO
OUT BROIL - 1000W "OB" BU
NO R
NO
OFF BAKE ECONO BROIL MAXI BROIL CONV BROIL CONV ROAST CONV BAKE CLEAN PREHEAT-BAKE PREHEAT-CONV PREHEAT-CLEAN DEHYDRATE RAISING BREAD
BK
THERMAL SWITCH 316°C (600°F)
"NC" W W
BK/W W
BU RELAY "OB"
– OFF
– ON OR OFF
BK W
NO
Y
HALOGEN 5W/BULB
R BU
P5-7 GN
BK
W
P2-4 P2-1
W
18 VDC DOOR LOCK SOLENOID
LIGHT POWER SUPPLY
IN BROIL - 1667W "IB" OR
– CYCLING (MAX. PERIOD = 23 SEC.) – CYCLING (MAX. PERIOD = 90 SEC.) – CYCLING (MAX. PERIOD = 60 SEC.)
W
LOWER BLOWER
"IB"
– ON
R
J1-3
M ~
LATCH RELAY COIL
RELAY LOGIC KEY
W
M ~
OR/W
B POLE 1 D POLE 2
N
R
J1-6
UPPER BLOWER
P7-5 GY/W
P5-3
BK P7-1 BK P3-3 BK P2-3 BK P3-2
RELAY CONTACTS A C
Y
J1-7
OR
NO
R
"C" "NO" LATCH RELAY POLE 2 BK/W
RELAY "IB"
C
W
D
RELAY LOGIC MICROWAVE OVEN
MODES
LAY MA S G. GR ILL CO NV CO NV MA FAN GF LIG AN HT UPP ER BLO WE R
LATCH SWITCH 1 (OPERATED BY SOLENOID)
TAN
W
RE
CAVITY SIZE Y 30” TAN OPEN 27”
J1-2
W
BR
P15-1
V/W V/W
TEMP SENSOR 1080 Ω @ 70°F/21.1°C
GY
120VAC
CONVECTION -1500W CONVECTION P8-4 T.O.D. GY P9-3 GRILL T.O.D. BK W BU GRILL - 1200W P9-1 R
0.6A
BK
CONVECTION FAN
AIR VENT SOLENOID
P14-1
GY
M ~
Y BU/R CONVECTION TEMP SENSOR 280k Ω @ 70°F/21.1°C
MICROWAVE LOWER OVEN
L2 L1
GND N
R
BK
BU PRIMARY INTERLOCK SWITCH BK
4
LIGHT POWER SUPPLY BK
J1-5
MICRO. FULL PWR MICRO. VAR. PWR BROIL MANUAL CRISP OFF CONV. QUICK PREHEAT CONV. COOK
ULTIMA COOK™
IF LOWER IS IN CLEAN MODE, MICROWAVE WILL NOT FUNCTION
FOR SERVICE TECHNICIAN'S USE ONLY
PART NO. 8300543 REV. E
PAGE 4
TECH SHEET - DO NOT DISCARD
The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses.
STRIP CIRCUITS
BAKE AND PREHEAT-BAKE (OVEN) L1
BAKE 2000W
"B" NO P2-4
P2-1 BK
R
CONVECTION BAKE (OVEN) N L2 L1
OVEN "B" NO R SHUTDOWN THERMAL R FUSE
R RELAY "B"
BK
OR P3-1 OR P3-2
Y
THERMAL SWITCH 316°C (600°F)
P7-5 GY P7-2
BK
W
BK
BK
P7-5 GY P7-2
N L2 L1
BK
BK
D
BK
BK
P3-2
BK
W
BU
N L2 L1
L1 R
BK
BK/W W
P2-4
R
P7-1
W
VT GY UPPER BLOWER
RELAY "B"
OUT BROIL "OB" NO 1000W "OB" NO R
THERMAL SWITCH 316°C (600°F)
IN BROIL "IB" NO 1667W "IB" NO
P3-2
OR
W W
BK
HALOGEN 5W/BULB
BK
W
"NC" W "NO" W
BK/W W
P3-1 OR BK
R
R
"C" BK/W C
D
LATCH RELAY POLE 2
OR
RELAY "IB" BK
BK W
P7-5 GY UPPER BLOWER
W
LOWER BLOWER
LIGHT POWER SUPPLY
PART NO. 8300543 REV. E
OVEN SHUTDOWN "B" NO THERMAL FUSE R R
P7-6 VT
P7-1
W
N L2 L1 W
BU BU RELAY "OB"
W
BK
W
BAKE 2000W
"B" NO
P2-3
"NC"
"C" "NO" BK/W W C D LATCH RELAY BK POLE 2
BK
CONVECTION FAN
THERMAL SWITCH 316°C (600°F)
BK
P7-2
OR
P2-1 BU BK
RELAY "IB"
P7-5
P7-7
R
"IB" NO R OR
W
HALOGEN 5W/BULB
CONVECTION ROAST AND PREHEAT CONVECTION (OVEN)
R
P3-1 OR P3-2
BK
W
P2-3
"IB" NO OR
BK
W LOWER BLOWER
BK
RELAY "OB" IN BROIL 1667W
W
D C LATCH RELAY POLE 2
LIGHT POWER SUPPLY
P7-2
MAXI BROIL (OVEN)
BU
BK/W
W
P7-5 GY UPPER BLOWER
W
OVEN SHUTDOWN THERMAL FUSE "OB" NO
"NO"
W
W
OUT BROIL "OB" NO 1000W
"NC"
BK/W W "C"
BK
HALOGEN 5W/BULB
BK
THERMAL SWITCH 316°C (600°F)
P7-6 VT
W
BK
R
R
BU
OR OR RELAY "IB"
P3-1 OR
LOWER BLOWER
LIGHT POWER SUPPLY
N L2 L1 W
R IN BROIL "IB" NO 1667W "IB" NO
W
P7-5 GY UPPER BLOWER
BK
W
RELAY "OB"
W
LATCH RELAY POLE 2
P7-6 VT
P7-6
BK
BK
BU
P2-3
"NO" C
BK
W
HALOGEN 5W/BULB
OVEN SHUTDOWN THERMAL OUT BROIL FUSE "OB" NO 1000W "OB" NO
W
"C"
BK
BK
P7-1
P2-1 BU
"NC"
BK/W
P2-1 BU
W LOWER BLOWER
CONVECTION FAN
P7-7 OR
R
W
RELAY "IB"
L1
L1
R
OR
OR
P7-2
UPPER BLOWER
W
BK/W
P7-1
C D LATCH RELAY POLE 2
BK
LIGHT POWER SUPPLY
W
THERMAL SWITCH 316°C (600°F)
BK
BK/W
W
BK
OVEN SHUTDOWN THERMAL IN BROIL 1667W "IB" NO FUSE
"IB" NO
P3-2
W
"B" NO R R
RELAY "B"
"NO"
BK
W W
BK/W
BAKE 2000W
W
"C"
CONVECTION BROIL (OVEN)
L1 OR
P2-3 P7-6 VT
ECONO BROIL (OVEN) P3-1
BK
W
HALOGEN 5W/BULB
BK
"B" NO R
P2-4 R
LIGHT POWER SUPPLY LOWER BLOWER
"NC"
W
LATCH RELAY POLE 2
UPPER BLOWER
BK
THERMAL SWITCH 316°C (600°F)
RELAY "CV"
D
P7-6 VT
R
R
W
RELAY "IB" INNER BROIL PREHEAT ONLY
BK
Y
Y
P3-3
"NO" C
OR
BK
W
BK/W
R
P3-4
"NC"
W
OVEN SHUTDOWN THERMAL FUSE "CV" NO
CONV. 1600W
"CV" NO
OUT BROIL "OB" NO 1000W "OB" NO R
IN BROIL "IB" NO 1667W "IB" NO
P7-1
P7-1
BU
P2-3
BK/W "C"
BK
N L2 L1 CONVECTION FAN
P7-7 OR
R
BU BU RELAY "OB"
BK
L1
LOWER BLOWER P7-2
LIGHT POWER SUPPLY
W
BK W
BK
HALOGEN 5W/BULB
BK
W
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 5
CLEAN (OVEN) W
TEMP SENSOR 1080 Ω @ 70°F/21.1°C
t°
V/W
W
V/W
RETURN LINE MUST BE CONNECTED TAN +5V SWITCH PULSE ON LATCH ASSY DOOR SWITCH 1 TAN
OR
TAN
LATCH RELAY POLE 1 TAN BU
CAVITY SIZE SELECT
L1
BR
P7-3
PULSE RELAY
Y
UNLOCK
P5-1
"B"
BAKE - 2000W
NO
P5-3
BU
P5-6
"B"
P5-10
BK/W
BU
"IB" NO IN BROIL - 1667W
P3-1
OR
P7-6
VT
"IB" NO
R
P7-1
BK W
M ~ UPPER BLOWER
GY
P7-2
RELAY CONTACTS
M ~
LIGHT POWER SUPPLY
LOWER BLOWER
BK
B POLE 1 D POLE 2
W
BK
BK
W
W
N
N LIGHT POWER SUPPLY
P10-1 BR
MAGNETRON FAN
P10-2 BU BK
L1
M ~
P10-4
DOOR SHOWN IN CLOSED POSITION
GY
3
TURNTABLE CAVITY T.O.D.
15A FUSE W
HIGH VOLTAGE SYSTEM 900W OUTPUT
MAGNETRON T.O.D. R P8-2 R
R
TAN
4
MONITOR SWITCH
BR
M ~
BK
1
BK
PRIMARY INTERLOCK SWITCH
BU
SECONDARY INTERLOCK SWITCH W
P8-1 J1-4
W W
W
MAIN 2 FILTER
P7-6 BK
VT
W
M ~
P7-1
MANUAL CRISP (MICROWAVE)
UPPER BLOWER
L1
P10-2 BK
BU
M ~
P10-4 R
DOOR SHOWN IN CLOSED POSITION
M ~
CAVITY T.O.D.
J1-1 BK
1
3
TAN
15A FUSE W
4
MAIN 2 FILTER
HALOGEN MICROWAVE CAVITY LIGHT
R R GY MONITOR SWITCH
BR
TURNTABLE
BK
GN
W
BR J1-5 BK
BK
L2
N LIGHT POWER SUPPLY P10-1
MAGNETRON FAN
20A FUSE BK
HALOGEN MICROWAVE CAVITY LIGHT
R
R
R
GN
W
BK J1-5
BK
W
HALOGEN 5W/BULB
FULL POWER / VARIABLE POWER (MICROWAVE)
J1-1 BK
W
BK
P7-5
20A FUSE BK
W
"NO"
LATCH RELAY POLE 2 BK/W C D
OR RELAY "IB"
P3-2
LATCH RELAY COIL
W
"C"
OR
A C
THERMAL SWITCH 316°C (600°F) "NC"
R
BU RELAY "OB"
P2-1
BK LATCH SWITCH 1 (OPERATED BY SOLENOID)
R
R
R
P2-3
BK
L1
OVEN SHUTDOWN THERMAL FUSE
NO
"OB" NO OUT BROIL - 1000W "OB" NO
P2-4
L2
W
RELAY "B"
BU
BK
BR
R
R
BR
Y
TAN
P5-9
N
DOOR LOCK SOLENOID 18 VDC BR
LOCK
P5-8
R
P8-2
BK PRIMARY INTERLOCK SWITCH
HIGH VOLTAGE SYSTEM 900W OUTPUT
MAGNETRON T.O.D. R
R
BU
P8-1
SECONDARY INTERLOCK SWITCH W W
J1-4
W
W BK
P7-1
FOR SERVICE TECHNICIAN'S USE ONLY
P7-6
VT
P9-3
BU
P9-1
R
GRILL T.O.D. BK
GRILL - 1200W
W
M ~
W
UPPER BLOWER
J1-6 J1-3
W R
PART NO. 8300543 REV. E
PAGE 6
TECH SHEET - DO NOT DISCARD
The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses.
STRIP CIRCUITS CONVECT (MICROWAVE) L1
N L2 LIGHT POWER SUPPLY
DOOR SHOWN IN CLOSED POSITION
BK
20A FUSE BK
J1-1 BK
TAN
BK
CAVITY T.O.D.
BR
P10-2
BU
BK J1-5
MAGNETRON FAN M ~
GY
R
PRIMARY INTERLOCK SWITCH
MONITOR SWITCH
BR
M ~
BK
GN 1
HALOGEN MICROWAVE CAVITY LIGHT
R
R
P10-4
R
15A FUSE
BK 3 4 W MAIN 2 W FILTER
P10-1
W
TURNTABLE
J1-4
W W
P10-3
Y
CONVECTION FAN
Y
M ~
GY
AIR VENT SOLENOID 120VAC
CONVECTION TEMP SENSOR 280k Ω @ 70°F/21.1°C
t°
BU/R
R
P14-1
BU/R
W
P14-2
GY
Y
BK P7-1
P8-3
BR
P8-4
GY
P7-6
VT
P9-3
BU
P9-1
R
CONVECTION T.O.D. BR CONV - 1500W W
W
J1-7
UPPER BLOWER GRILL T.O.D. BK GRILL - 1200W
W
J1-6
BK
P10-1 BR
BK P10-4
P10-2
N L2
M ~
GY
MONITOR SWITCH
M ~
J1-1 BK BK
3 4 W MAIN 2 W FILTER
CAVITY T.O.D. R
TAN
P8-2
BK P8-1 PRIMARY INTERLOCK SWITCH
15A FUSE
GN 1
W
MAGNETRON FAN
BU
R TURNTABLE BR BK
R
HALOGEN MICROWAVE CAVITY LIGHT
R
R
J1-5
DOOR SHOWN IN CLOSED POSITION
W
J1-3
LIGHT POWER SUPPLY
L1
R W
M ~
ULTIMA COOK™
20A FUSE BK
J1-2
HIGH VOLTAGE SYSTEM 900W OUTPUT
MAGNETRON T.O.D. R
R
SECONDARY INTERLOCK SWITCH BU W
J1-4
W W
P10-3
CONVECTION FAN
Y
Y
M ~
AIR VENT SOLENOID 120VAC
CONVECTION TEMP SENSOR 280k Ω @ 70°F/21.1°C
BU/R t°
BU/R
GY BR W CONV - 1500W
Y
R
P14-1
W
P14-2
P8-3 P8-4 P9-3
BR CONVECTION T.O.D.
GY BU
BK P7-1
J1-2 W
BK W GRILL - 1200W
GRILL T.O.D.
P9-1 R P7-6 VT
GY
J1-7 J1-6 W
R
J1-3
R W
M ~
UPPER BLOWER
BROIL (NO MICROWAVE ENERGY)
N LIGHT POWER SUPPLY
W
L1 DOOR SHOWN IN CLOSED POSITION
BK P10-4 BK 20A FUSE BK
J1-1 BK BK 3 4 W MAIN 2 W FILTER
TAN 15A FUSE
GN 1
CAVITY T.O.D.
BR
P10-2
BU
BK J1-5
R
M ~
GY BR
M ~
R
BK PRIMARY INTERLOCK SWITCH
R
HALOGEN MICROWAVE CAVITY LIGHT
MAGNETRON FAN
R
MONITOR SWITCH
TURNTABLE J1-4
W W
BK P7-1
PART NO. 8300543 REV. E
P10-1
L2
P7-6
UPPER BLOWER
VT
P9-3
BU
P9-1
R
W
M ~
GRILL T.O.D.
BK GRILL-1200W W
J1-6 J1-3
W R
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 7
TESTING THE MICROWAVE OVEN COMPONENTS COMPONENT HIGH VOLTAGE TRANSFORMER
TEST PROCEDURE 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Primary Secondary Filament to Ground Primary Filament
3. Measure resistance (Rx100).
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the F and FA terminals. 3. Set the ohmmeter to Rx1k and measure filament to chassis. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1k and touch the leads to the terminals.
MAGNETRON
CAPACITOR
Normal = Momentarily indicates several ohms, and gradually returns to infinity. Normal = Infinity. Normal = Continuity. Abnormal = Infinity. Normal = Infinity. Abnormal = Continuity.
3. Measure the reverse resistance. NOTE: Some inexpensive meters may show infinity in both directions. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.
FAN MOTOR
TURNTABLE MOTOR
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.
THERMAL FUSES
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Open Cavity Thermal Fuse 165° C (329° F) Grill Thermal Fuse 160° C (320° F) Magnetron Thermal Fuse 145° C (293° F) Convection Thermal Fuse 145° C (293° F) 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.
Magnetron Grill and Thermal Convection Fuse Thermal Fuses
GRILL ELEMENT Bulbs
Normal = approximately 25 Ω. Abnormal = Infinity. Normal = approximately 25 Ω. Abnormal = Infinity.
Close
MAIN FILTER 3 1
4 2
Normal = Continuity. Abnormal = Infinity.
140° C (284° F) 125° C (257° F) 105° C (221° F) Normal = 14 Ω for both bulbs. Normal = 7 Ω for one bulb. Abnormal = Infinity.
1. Remove the lead from one terminal. 2. Set the ohmmeter to the Rx1k and touch the leads to the terminals.
AIR VENT SOLENOID
Normal = Less than 1 Ω. Normal = Less than 1 Ω. Normal = 0 Ω. Normal = Infinity. Normal = Infinity.
Normal = approximately 0 Ω. Normal = Infinity.
3. Terminal to chassis. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1k and measure forward resistance.
RECTIFIER
Cavity Thermal Fuse
RESULTS
Normal = approximately 1650 Ω. Abnormal = Infinity.
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = less than 1 Ω. Terminal 1 - Terminal 3 (coil) Terminal 2 - Terminal 4 (coil) Normal = less than 1 Ω. Terminal 3 - Terminal 4 (resistor) Normal = 660k Ω - 700k Ω. Abnormal = Infinity.
OVEN SHUTDOWN THERMAL FUSE
Thermal Fuse Part No.
Opening Temp. °F
4452223
266°F ± 10°F
Pink/Wht Stripe
4451442
248°F+18°F to 248°F – 0°F
Yellow/Wht Stripe
4450934
338°F ± 11.7°F
4450334
275°F ± 11.7°F
Verify that the oven shutdown thermal fuse is OK.
4450250
320°F ± 11.7°F
To replace this thermal fuse, refer to chart at right for correct part number.
4450249
302°F ± 11.7°F
Green/Wht Stripe
8300802
230°F+18°F to 230°F – 0°F
Blue/Wht Stripe
The oven shutdown thermal fuse is located at the back of the oven. It will shut down the elements if the temperature at the back of the oven exceeds component limits.
FOR SERVICE TECHNICIAN'S USE ONLY
Reclose Marking Temp. °F (with Black Letters)
Red –31°F MAX
Orange/Wht Stripe Blue
PART NO. 8300543 REV. E
PAGE 8
TECH SHEET - DO NOT DISCARD
COMPONENTS
FRONT/TOP/REAR SERVICEABLE
Electronic Control Control Transformer Membrane Switch Halogen Lights Latch Solenoid Bake DLB Relay Outer Broil DLB Relay Inner Broil DLB Relay Convection Ring DLB Relay Latch Switch DLB Relay Latch Switch
Door Switch
CHECK POINTS
RESULTS
Front Top Front Light Bulb - Front Light Assy. - Rear Front Top Top Top Top
— — — —
— — — —
— — — — —
— — — — —
Top Front
— P5-6 (BU) to P5-1 (TAN)
Front
P5-3 (BR) to P5-1 (TAN)
— Door Unlocked = Open Circuit Door Locked = Closed Circuit Door Open = Closed Circuit Door Closed = Open Circuit 50 Ω
Front
Door Lock Solenoid (with Door Closed) Oven Temperature Sensor Meat Probe Sensor
Front Probe - Front Jack - Rear Rear
Lower Oven Blower
CAN BE TESTED AT CONTROL PANEL
Oven Light Transformer
Top
Oven Shutdown Thermal Fuse
Rear
Bake Element
Rear
Convection Element (Lower Oven)
Front
Convection Fan Motor (Lower Oven) Broil Element - Outer (Lower Oven )
Rear Front
Broil Element Inner (Lower Oven)
Front
Microwave Light Transformer (M/W)
Top
Upper Blower (M/W)
Rear
Convection Motor/Fan (M/W) Convection Element (M/W)
Rear Rear
P7-3 (Y) to Neutral (W) P5-8 (V/W) to P5-9 (V/W) P5-4 (Y) to P5-5 (Y) P7-5 (GY/W) to Neutral (W) Primary Winding Secondary Winding P2-4 (R) or P3-1 (OR) to Red Wire at Terminal Block P2-4 (R) to Red Wire at Terminal Block P3-4 (Y) to Red Wire at Terminal Block P7-7 (OR/W) to Neutral (W) P2-1 (BU) to Red Wire at Terminal Block P3-1 (OR) to Red Wire at Terminal Block Primary Winding Secondary Winding P7-6 (VT) to Neutral (W) P10-3 (Y) to Neutral (W) P8-3 (BR) to Neutral (W)
1080 Ω @ 70°F/21.1°C 78k Ω 14 Ω to 18 Ω 40 Ω to 45 Ω Less than 1 Ω Closed Circuit 25 Ω to 30 Ω 33 Ω to 37 Ω 18 Ω 53 Ω to 59 Ω 32 Ω to 35 Ω 40 Ω to 45 Ω Less than 1 Ω 10 Ω to 15 Ω
COMPONENT LOCATIONS Element Relays Electronic Control (Behind Front Panel) Tech Sheet
Blower Motor Main Filter
Latch Relay Oven Light Transformer MW Light Transformer Control Transformer
Membrane Switch
20-Amp Microwave Fuse
Grill Element Halogen Convection Light Fan Motor Assembly & Element Air Pressure on Back Relief Valve & Secondary Interlock Switch
Convection Thermal Fuse Cavity Thermal Fuse Grill Thermal Fuse Rectifier 15-Amp Line Fuse
Turntable Motor
High Voltage Capacitor
Monitor Interlock Switch Primary Interlock Switch Cooling Fan Motor
Magnetron Thermal Fuse
Air Vent Solenoid
Lower Blower Motor Convection Bake Element
High Voltage Transformer Magnetron
Oven Temperature Sensor (Rear) Door Latch Assembly (Solenoid & Latch Switch)
Convection Fan Motor 316°C (600°F) Thermal Switch
Oven Shutdown Thermal Fuse (Rear Panel)
Temperature Bulb in Cavity Halogen Lamp (Sides)
44 Ω 10 Ω to 20 Ω
CONTROL TRANSFORMER
18 (P17-3) T SEC 1
26 VAC 17 (P17-4) T
BK (P17-8) 8 120 VAC PRIMARY 60 Hz W (P17-10) 11
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING UNITED STATES PATENTS: 4,102,322
4,364,589
16 (P17-2) Y SEC 2
24 VAC 15 (P17-1) Y 14 (P17-6) V
SEC 3
7.5 VAC 13 (P17-5) V
4,467,184
OTHER PATENTS PENDING
PART NO. 8300543 REV. E
FOR SERVICE TECHNICIAN'S USE ONLY
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.
Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. ■
■
■
■
Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance - OR - touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance. Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only. When repackaging failed electronic control assembly in anti-static bag, observe above instructions.
DIAGNOSTICS Is oven in “Sabbath Mode”? If so, “SAB” will appear in digital display. Press and hold “6” key for 5 seconds to end Sabbath Mode. Disconnect power and perform the following checks: ■
■
■
■
The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout test procedures. Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 ohms per volt DC or greater. Resistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected.
PAGE 1
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: 1. Interlock Operation 2. Proper Door Closing 3. Seal and Sealing Surfaces (Arcing, Wear & Other Damage) 4. Damage to or Loosening of Hinges & Latches 5. Evidence of Dropping or Abuse c. Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line and cavity for proper alignment, integrity and connections. d. Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation, and transmission systems shall be repaired, replaced, or adjusted by procedures described in service manual before the oven is released to the owner. 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. f. Do not attempt to operate the oven if the door glass is broken.
PROBLEM: Bake Temperature Needs Adjustment 1. Press BAKE pad for 5 seconds. The default temp. 0° or a previously entered offset temp. will show in the Temp. Display. n
Press the BAKE pad to increase the temperature in 10° F or 5° C increments.
n
Press the BROIL pad to decrease the temperature in 10° F or 5° C increments. 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. 8300543 REV. E
PAGE 2
TECH SHEET - DO NOT DISCARD
FAILURE/ERROR DISPLAY CODES
■
NOTES: ■
Always disconnect power before touching internal parts of the oven! FAULT CODE
ERROR CODE
F0
E0
F1
F2
F3
F4
Default F code – no failure
E0, E1, & E2 Door switch malfunction E3 or E4
Electronic control malfunction
E0 or E1
Keypad not connected
E3
Key held down too long, or key is shorted
E0
Temperature sensor opened
E1
Temperature sensor shorted
E0
E0
F8
E1
All Other Codes
MEANING OF FAILURE CODE
Meat probe shorted
■
Upon replacement, immediately return old electronic oven control using the mailing label supplied with each new control. The Failure code shows up in the display.
RECOMMENDED REPAIR PROCEDURE Will only be displayed if user presses and holds the CANCEL key for 5 seconds and there is no pre-existing fault. Press CANCEL to clear display. Check oven door switch. If okay replace control. Replace control. 1. Check keypad connector for firm connection. 2. Press CANCEL. If error code returns after 60 sec., replace keypad. 1. 2. 3. 4.
Check sensor connection. Measure sensor resistance (1080Ω at 70° F. Add 2Ω per degree F). If resistance is not valid replace sensor. If sensor resistance and connections are good, then the oven cavity temperature must have exceeded a safe level. Check for welded-closed relays on the control.
1. 2. 3. 4.
Disconnect meat probe and measure probe resistance (78kΩ at 60° F, 37kΩ at 90° F). If resistance is not valid replace probe. Insert probe and check for a firm connection between probe and jack (in oven cavity). Check connection between jack and harness (in rear of oven).
1. Check the latch assembly: Check latch arm pivot joint, arm/solenoid connection, solenoid spring & and spring washer. 2. Check the Latch Solenoid: - Check for firm electrical connections. Self-clean latch will not lock - Disconnect the two wires from the solenoid and measure the resistance of the solenoid. A small resistance (approx. 300Ω) is normal. If the solenoid is open (∞Ω) or shorted (0Ω), it should be replaced. 3. 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. Self-clean latch will not unlock 4. Check Door Open/Closed Switch: Disconnect it and use a continuity tester: - Door open = switch closed, continuity should read 0Ω. - Door closed = switch open, continuity should read ∞Ω. 5. Finally, replace control. Electronic control malfunction
Replace control.
Fahrenheit (° F) to Celsius (° C) Conversion
1. Fill a glass measuring cup with 16 oz. (453cc) of tap water. Stir the thermometer through the water until the 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 temperature display.
3. Stir the thermometer through the water and record the maximum temperature.
2. To return the display to degrees Fahrenheit press the BROIL pad again for 5 seconds. “F” will show in the temperature display.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be a 20 - 38° F (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 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.
The power output of the magnetron can be measured by the following test: (for accurate results, the line voltage must be 120 VAC and the oven cavity must be clean).
PART NO. 8300543 REV. E
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 3
WIRE HARNESS SCHEMATIC
LIGHT
HEATING ELEMENT
AC DRIVE MOTOR
SOLENOID
PLUG WITH FEMALE CONNECTOR
RELAY COIL
ENCLOSED THERMISTOR
RECEPTACLE WITH MALE CONNECTOR
RELAY CONTACTS
OPERATED BY DOOR
T.O.D. (RESETABLE) THERMAL FUSE/T.O.D. (NON-RESETABLE ONE TIME)
NOTES: When replacing the electronic control, be sure to attach the cavity select line to the proper terminal (see “CAVITY SIZE” table below). Dots indicate connections or splices. Circuit shown in STANDBY/OFF mode with microwave oven door and lower oven door open.
GROUND (CHASSIS)
BR
ELECTRONIC CONTROL
L1
DOOR SW BK
P8-2
CAVITY T.O.D. TAN
J1-1 BK
20A FUSE BK
15A FUSE
BK 1
3
GN
BR R
TO MONITOR
L1 N
HALOGEN MICROWAVE CAVITY LIGHT
R
W
R
R P8-1 P10-2
BU
R
TURNTABLE GY
M ~
P17-1
BR
M ~
P10-4
Y P17-2 TAN P17-3 TAN P17-4 VT P17-5 VT P17-6 BK W P17-8 P17-10
CONTROL TRANSFORMER
MAIN FILTER
P10-1
BU Y
N 2
R MAGNETRON T.O.D.
MAGNETRON FAN W
BU
W
SECONDARY INTERLOCK SWITCH
FROM PRIMARY INTERLOCK SWITCH
BU
J1-4
W
MAGNETRON 900W OUTPUT
MONITOR SWITCH
W
W P10-3
Y
Y
t°
BU/R
R W
P8-3 BR P14-2
P5-8
W Y W Y
P5-4
TAN ON LATCH ASSY BR BR LATCH RELAY POLE 1 BU TAN BU
P5-1
W t° W
MEAT PROBE 78k Ω @ 60°F/15.5°C
t°
+5V SWITCH PULSE DOOR SWITCH 1 TAN OR
CAVITY SIZE TAN SELECT
P5-9
P5-5
P15-5
W
P7-6
VT
PULSE RELAY
LOCK UNLOCK P7-3
Y BK
P7-2 BK
P5-6
P7-7
P5-10
P3-4
Y
"CV"
"B"
– PULSED FOR 1/2 SECOND
NO
W
Y CONV - 1600W Y
W
"CV" NO
M ~ R
RELAY "CV" "B" R BAKE - 2000W R
NO
W
OVEN SHUTDOWN THERMAL FUSE R
R
OR RELAY "B"
P3-1 "OB"
P15-3 GN
RE LAY BA S KE IN B R OU OIL TB CO ROIL NV CO ELEM NV OV FAN LT LOW ER B PU LS LOWE LO E REL R CK AY / UPP UNLO C ER BLO K WE R
RELAY LOGIC LOWER OVEN
MODES
W
CONVECTION FAN
W
NO
OUT BROIL - 1000W "OB" BU
NO R
NO
OFF BAKE ECONO BROIL MAXI BROIL CONV BROIL CONV ROAST CONV BAKE CLEAN PREHEAT-BAKE PREHEAT-CONV PREHEAT-CLEAN DEHYDRATE RAISING BREAD
BK
THERMAL SWITCH 316°C (600°F)
"NC" W W
BK/W W
BU RELAY "OB"
– OFF
– ON OR OFF
BK W
NO
Y
HALOGEN 5W/BULB
R BU
P5-7 GN
BK
W
P2-4 P2-1
W
18 VDC DOOR LOCK SOLENOID
LIGHT POWER SUPPLY
IN BROIL - 1667W "IB" OR
– CYCLING (MAX. PERIOD = 23 SEC.) – CYCLING (MAX. PERIOD = 90 SEC.) – CYCLING (MAX. PERIOD = 60 SEC.)
W
LOWER BLOWER
"IB"
– ON
R
J1-3
M ~
LATCH RELAY COIL
RELAY LOGIC KEY
W
M ~
OR/W
B POLE 1 D POLE 2
N
R
J1-6
UPPER BLOWER
P7-5 GY/W
P5-3
BK P7-1 BK P3-3 BK P2-3 BK P3-2
RELAY CONTACTS A C
Y
J1-7
OR
NO
R
"C" "NO" LATCH RELAY POLE 2 BK/W
RELAY "IB"
C
W
D
RELAY LOGIC MICROWAVE OVEN
MODES
LAY MA S G. GR ILL CO NV CO NV MA FAN GF LIG AN HT UPP ER BLO WE R
LATCH SWITCH 1 (OPERATED BY SOLENOID)
TAN
W
RE
CAVITY SIZE Y 30” TAN OPEN 27”
J1-2
W
BR
P15-1
V/W V/W
TEMP SENSOR 1080 Ω @ 70°F/21.1°C
GY
120VAC
CONVECTION -1500W CONVECTION P8-4 T.O.D. GY P9-3 GRILL T.O.D. BK W BU GRILL - 1200W P9-1 R
0.6A
BK
CONVECTION FAN
AIR VENT SOLENOID
P14-1
GY
M ~
Y BU/R CONVECTION TEMP SENSOR 280k Ω @ 70°F/21.1°C
MICROWAVE LOWER OVEN
L2 L1
GND N
R
BK
BU PRIMARY INTERLOCK SWITCH BK
4
LIGHT POWER SUPPLY BK
J1-5
MICRO. FULL PWR MICRO. VAR. PWR BROIL MANUAL CRISP OFF CONV. QUICK PREHEAT CONV. COOK
ULTIMA COOK™
IF LOWER IS IN CLEAN MODE, MICROWAVE WILL NOT FUNCTION
FOR SERVICE TECHNICIAN'S USE ONLY
PART NO. 8300543 REV. E
PAGE 4
TECH SHEET - DO NOT DISCARD
The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses.
STRIP CIRCUITS
BAKE AND PREHEAT-BAKE (OVEN) L1
BAKE 2000W
"B" NO P2-4
P2-1 BK
R
CONVECTION BAKE (OVEN) N L2 L1
OVEN "B" NO R SHUTDOWN THERMAL R FUSE
R RELAY "B"
BK
OR P3-1 OR P3-2
Y
THERMAL SWITCH 316°C (600°F)
P7-5 GY P7-2
BK
W
BK
BK
P7-5 GY P7-2
N L2 L1
BK
BK
D
BK
BK
P3-2
BK
W
BU
N L2 L1
L1 R
BK
BK/W W
P2-4
R
P7-1
W
VT GY UPPER BLOWER
RELAY "B"
OUT BROIL "OB" NO 1000W "OB" NO R
THERMAL SWITCH 316°C (600°F)
IN BROIL "IB" NO 1667W "IB" NO
P3-2
OR
W W
BK
HALOGEN 5W/BULB
BK
W
"NC" W "NO" W
BK/W W
P3-1 OR BK
R
R
"C" BK/W C
D
LATCH RELAY POLE 2
OR
RELAY "IB" BK
BK W
P7-5 GY UPPER BLOWER
W
LOWER BLOWER
LIGHT POWER SUPPLY
PART NO. 8300543 REV. E
OVEN SHUTDOWN "B" NO THERMAL FUSE R R
P7-6 VT
P7-1
W
N L2 L1 W
BU BU RELAY "OB"
W
BK
W
BAKE 2000W
"B" NO
P2-3
"NC"
"C" "NO" BK/W W C D LATCH RELAY BK POLE 2
BK
CONVECTION FAN
THERMAL SWITCH 316°C (600°F)
BK
P7-2
OR
P2-1 BU BK
RELAY "IB"
P7-5
P7-7
R
"IB" NO R OR
W
HALOGEN 5W/BULB
CONVECTION ROAST AND PREHEAT CONVECTION (OVEN)
R
P3-1 OR P3-2
BK
W
P2-3
"IB" NO OR
BK
W LOWER BLOWER
BK
RELAY "OB" IN BROIL 1667W
W
D C LATCH RELAY POLE 2
LIGHT POWER SUPPLY
P7-2
MAXI BROIL (OVEN)
BU
BK/W
W
P7-5 GY UPPER BLOWER
W
OVEN SHUTDOWN THERMAL FUSE "OB" NO
"NO"
W
W
OUT BROIL "OB" NO 1000W
"NC"
BK/W W "C"
BK
HALOGEN 5W/BULB
BK
THERMAL SWITCH 316°C (600°F)
P7-6 VT
W
BK
R
R
BU
OR OR RELAY "IB"
P3-1 OR
LOWER BLOWER
LIGHT POWER SUPPLY
N L2 L1 W
R IN BROIL "IB" NO 1667W "IB" NO
W
P7-5 GY UPPER BLOWER
BK
W
RELAY "OB"
W
LATCH RELAY POLE 2
P7-6 VT
P7-6
BK
BK
BU
P2-3
"NO" C
BK
W
HALOGEN 5W/BULB
OVEN SHUTDOWN THERMAL OUT BROIL FUSE "OB" NO 1000W "OB" NO
W
"C"
BK
BK
P7-1
P2-1 BU
"NC"
BK/W
P2-1 BU
W LOWER BLOWER
CONVECTION FAN
P7-7 OR
R
W
RELAY "IB"
L1
L1
R
OR
OR
P7-2
UPPER BLOWER
W
BK/W
P7-1
C D LATCH RELAY POLE 2
BK
LIGHT POWER SUPPLY
W
THERMAL SWITCH 316°C (600°F)
BK
BK/W
W
BK
OVEN SHUTDOWN THERMAL IN BROIL 1667W "IB" NO FUSE
"IB" NO
P3-2
W
"B" NO R R
RELAY "B"
"NO"
BK
W W
BK/W
BAKE 2000W
W
"C"
CONVECTION BROIL (OVEN)
L1 OR
P2-3 P7-6 VT
ECONO BROIL (OVEN) P3-1
BK
W
HALOGEN 5W/BULB
BK
"B" NO R
P2-4 R
LIGHT POWER SUPPLY LOWER BLOWER
"NC"
W
LATCH RELAY POLE 2
UPPER BLOWER
BK
THERMAL SWITCH 316°C (600°F)
RELAY "CV"
D
P7-6 VT
R
R
W
RELAY "IB" INNER BROIL PREHEAT ONLY
BK
Y
Y
P3-3
"NO" C
OR
BK
W
BK/W
R
P3-4
"NC"
W
OVEN SHUTDOWN THERMAL FUSE "CV" NO
CONV. 1600W
"CV" NO
OUT BROIL "OB" NO 1000W "OB" NO R
IN BROIL "IB" NO 1667W "IB" NO
P7-1
P7-1
BU
P2-3
BK/W "C"
BK
N L2 L1 CONVECTION FAN
P7-7 OR
R
BU BU RELAY "OB"
BK
L1
LOWER BLOWER P7-2
LIGHT POWER SUPPLY
W
BK W
BK
HALOGEN 5W/BULB
BK
W
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 5
CLEAN (OVEN) W
TEMP SENSOR 1080 Ω @ 70°F/21.1°C
t°
V/W
W
V/W
RETURN LINE MUST BE CONNECTED TAN +5V SWITCH PULSE ON LATCH ASSY DOOR SWITCH 1 TAN
OR
TAN
LATCH RELAY POLE 1 TAN BU
CAVITY SIZE SELECT
L1
BR
P7-3
PULSE RELAY
Y
UNLOCK
P5-1
"B"
BAKE - 2000W
NO
P5-3
BU
P5-6
"B"
P5-10
BK/W
BU
"IB" NO IN BROIL - 1667W
P3-1
OR
P7-6
VT
"IB" NO
R
P7-1
BK W
M ~ UPPER BLOWER
GY
P7-2
RELAY CONTACTS
M ~
LIGHT POWER SUPPLY
LOWER BLOWER
BK
B POLE 1 D POLE 2
W
BK
BK
W
W
N
N LIGHT POWER SUPPLY
P10-1 BR
MAGNETRON FAN
P10-2 BU BK
L1
M ~
P10-4
DOOR SHOWN IN CLOSED POSITION
GY
3
TURNTABLE CAVITY T.O.D.
15A FUSE W
HIGH VOLTAGE SYSTEM 900W OUTPUT
MAGNETRON T.O.D. R P8-2 R
R
TAN
4
MONITOR SWITCH
BR
M ~
BK
1
BK
PRIMARY INTERLOCK SWITCH
BU
SECONDARY INTERLOCK SWITCH W
P8-1 J1-4
W W
W
MAIN 2 FILTER
P7-6 BK
VT
W
M ~
P7-1
MANUAL CRISP (MICROWAVE)
UPPER BLOWER
L1
P10-2 BK
BU
M ~
P10-4 R
DOOR SHOWN IN CLOSED POSITION
M ~
CAVITY T.O.D.
J1-1 BK
1
3
TAN
15A FUSE W
4
MAIN 2 FILTER
HALOGEN MICROWAVE CAVITY LIGHT
R R GY MONITOR SWITCH
BR
TURNTABLE
BK
GN
W
BR J1-5 BK
BK
L2
N LIGHT POWER SUPPLY P10-1
MAGNETRON FAN
20A FUSE BK
HALOGEN MICROWAVE CAVITY LIGHT
R
R
R
GN
W
BK J1-5
BK
W
HALOGEN 5W/BULB
FULL POWER / VARIABLE POWER (MICROWAVE)
J1-1 BK
W
BK
P7-5
20A FUSE BK
W
"NO"
LATCH RELAY POLE 2 BK/W C D
OR RELAY "IB"
P3-2
LATCH RELAY COIL
W
"C"
OR
A C
THERMAL SWITCH 316°C (600°F) "NC"
R
BU RELAY "OB"
P2-1
BK LATCH SWITCH 1 (OPERATED BY SOLENOID)
R
R
R
P2-3
BK
L1
OVEN SHUTDOWN THERMAL FUSE
NO
"OB" NO OUT BROIL - 1000W "OB" NO
P2-4
L2
W
RELAY "B"
BU
BK
BR
R
R
BR
Y
TAN
P5-9
N
DOOR LOCK SOLENOID 18 VDC BR
LOCK
P5-8
R
P8-2
BK PRIMARY INTERLOCK SWITCH
HIGH VOLTAGE SYSTEM 900W OUTPUT
MAGNETRON T.O.D. R
R
BU
P8-1
SECONDARY INTERLOCK SWITCH W W
J1-4
W
W BK
P7-1
FOR SERVICE TECHNICIAN'S USE ONLY
P7-6
VT
P9-3
BU
P9-1
R
GRILL T.O.D. BK
GRILL - 1200W
W
M ~
W
UPPER BLOWER
J1-6 J1-3
W R
PART NO. 8300543 REV. E
PAGE 6
TECH SHEET - DO NOT DISCARD
The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses.
STRIP CIRCUITS CONVECT (MICROWAVE) L1
N L2 LIGHT POWER SUPPLY
DOOR SHOWN IN CLOSED POSITION
BK
20A FUSE BK
J1-1 BK
TAN
BK
CAVITY T.O.D.
BR
P10-2
BU
BK J1-5
MAGNETRON FAN M ~
GY
R
PRIMARY INTERLOCK SWITCH
MONITOR SWITCH
BR
M ~
BK
GN 1
HALOGEN MICROWAVE CAVITY LIGHT
R
R
P10-4
R
15A FUSE
BK 3 4 W MAIN 2 W FILTER
P10-1
W
TURNTABLE
J1-4
W W
P10-3
Y
CONVECTION FAN
Y
M ~
GY
AIR VENT SOLENOID 120VAC
CONVECTION TEMP SENSOR 280k Ω @ 70°F/21.1°C
t°
BU/R
R
P14-1
BU/R
W
P14-2
GY
Y
BK P7-1
P8-3
BR
P8-4
GY
P7-6
VT
P9-3
BU
P9-1
R
CONVECTION T.O.D. BR CONV - 1500W W
W
J1-7
UPPER BLOWER GRILL T.O.D. BK GRILL - 1200W
W
J1-6
BK
P10-1 BR
BK P10-4
P10-2
N L2
M ~
GY
MONITOR SWITCH
M ~
J1-1 BK BK
3 4 W MAIN 2 W FILTER
CAVITY T.O.D. R
TAN
P8-2
BK P8-1 PRIMARY INTERLOCK SWITCH
15A FUSE
GN 1
W
MAGNETRON FAN
BU
R TURNTABLE BR BK
R
HALOGEN MICROWAVE CAVITY LIGHT
R
R
J1-5
DOOR SHOWN IN CLOSED POSITION
W
J1-3
LIGHT POWER SUPPLY
L1
R W
M ~
ULTIMA COOK™
20A FUSE BK
J1-2
HIGH VOLTAGE SYSTEM 900W OUTPUT
MAGNETRON T.O.D. R
R
SECONDARY INTERLOCK SWITCH BU W
J1-4
W W
P10-3
CONVECTION FAN
Y
Y
M ~
AIR VENT SOLENOID 120VAC
CONVECTION TEMP SENSOR 280k Ω @ 70°F/21.1°C
BU/R t°
BU/R
GY BR W CONV - 1500W
Y
R
P14-1
W
P14-2
P8-3 P8-4 P9-3
BR CONVECTION T.O.D.
GY BU
BK P7-1
J1-2 W
BK W GRILL - 1200W
GRILL T.O.D.
P9-1 R P7-6 VT
GY
J1-7 J1-6 W
R
J1-3
R W
M ~
UPPER BLOWER
BROIL (NO MICROWAVE ENERGY)
N LIGHT POWER SUPPLY
W
L1 DOOR SHOWN IN CLOSED POSITION
BK P10-4 BK 20A FUSE BK
J1-1 BK BK 3 4 W MAIN 2 W FILTER
TAN 15A FUSE
GN 1
CAVITY T.O.D.
BR
P10-2
BU
BK J1-5
R
M ~
GY BR
M ~
R
BK PRIMARY INTERLOCK SWITCH
R
HALOGEN MICROWAVE CAVITY LIGHT
MAGNETRON FAN
R
MONITOR SWITCH
TURNTABLE J1-4
W W
BK P7-1
PART NO. 8300543 REV. E
P10-1
L2
P7-6
UPPER BLOWER
VT
P9-3
BU
P9-1
R
W
M ~
GRILL T.O.D.
BK GRILL-1200W W
J1-6 J1-3
W R
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 7
TESTING THE MICROWAVE OVEN COMPONENTS COMPONENT HIGH VOLTAGE TRANSFORMER
TEST PROCEDURE 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Primary Secondary Filament to Ground Primary Filament
3. Measure resistance (Rx100).
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the F and FA terminals. 3. Set the ohmmeter to Rx1k and measure filament to chassis. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1k and touch the leads to the terminals.
MAGNETRON
CAPACITOR
Normal = Momentarily indicates several ohms, and gradually returns to infinity. Normal = Infinity. Normal = Continuity. Abnormal = Infinity. Normal = Infinity. Abnormal = Continuity.
3. Measure the reverse resistance. NOTE: Some inexpensive meters may show infinity in both directions. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.
FAN MOTOR
TURNTABLE MOTOR
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.
THERMAL FUSES
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Open Cavity Thermal Fuse 165° C (329° F) Grill Thermal Fuse 160° C (320° F) Magnetron Thermal Fuse 145° C (293° F) Convection Thermal Fuse 145° C (293° F) 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals.
Magnetron Grill and Thermal Convection Fuse Thermal Fuses
GRILL ELEMENT Bulbs
Normal = approximately 25 Ω. Abnormal = Infinity. Normal = approximately 25 Ω. Abnormal = Infinity.
Close
MAIN FILTER 3 1
4 2
Normal = Continuity. Abnormal = Infinity.
140° C (284° F) 125° C (257° F) 105° C (221° F) Normal = 14 Ω for both bulbs. Normal = 7 Ω for one bulb. Abnormal = Infinity.
1. Remove the lead from one terminal. 2. Set the ohmmeter to the Rx1k and touch the leads to the terminals.
AIR VENT SOLENOID
Normal = Less than 1 Ω. Normal = Less than 1 Ω. Normal = 0 Ω. Normal = Infinity. Normal = Infinity.
Normal = approximately 0 Ω. Normal = Infinity.
3. Terminal to chassis. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1k and measure forward resistance.
RECTIFIER
Cavity Thermal Fuse
RESULTS
Normal = approximately 1650 Ω. Abnormal = Infinity.
1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = less than 1 Ω. Terminal 1 - Terminal 3 (coil) Terminal 2 - Terminal 4 (coil) Normal = less than 1 Ω. Terminal 3 - Terminal 4 (resistor) Normal = 660k Ω - 700k Ω. Abnormal = Infinity.
OVEN SHUTDOWN THERMAL FUSE
Thermal Fuse Part No.
Opening Temp. °F
4452223
266°F ± 10°F
Pink/Wht Stripe
4451442
248°F+18°F to 248°F – 0°F
Yellow/Wht Stripe
4450934
338°F ± 11.7°F
4450334
275°F ± 11.7°F
Verify that the oven shutdown thermal fuse is OK.
4450250
320°F ± 11.7°F
To replace this thermal fuse, refer to chart at right for correct part number.
4450249
302°F ± 11.7°F
Green/Wht Stripe
8300802
230°F+18°F to 230°F – 0°F
Blue/Wht Stripe
The oven shutdown thermal fuse is located at the back of the oven. It will shut down the elements if the temperature at the back of the oven exceeds component limits.
FOR SERVICE TECHNICIAN'S USE ONLY
Reclose Marking Temp. °F (with Black Letters)
Red –31°F MAX
Orange/Wht Stripe Blue
PART NO. 8300543 REV. E
PAGE 8
TECH SHEET - DO NOT DISCARD
COMPONENTS
FRONT/TOP/REAR SERVICEABLE
Electronic Control Control Transformer Membrane Switch Halogen Lights Latch Solenoid Bake DLB Relay Outer Broil DLB Relay Inner Broil DLB Relay Convection Ring DLB Relay Latch Switch DLB Relay Latch Switch
Door Switch
CHECK POINTS
RESULTS
Front Top Front Light Bulb - Front Light Assy. - Rear Front Top Top Top Top
— — — —
— — — —
— — — — —
— — — — —
Top Front
— P5-6 (BU) to P5-1 (TAN)
Front
P5-3 (BR) to P5-1 (TAN)
— Door Unlocked = Open Circuit Door Locked = Closed Circuit Door Open = Closed Circuit Door Closed = Open Circuit 50 Ω
Front
Door Lock Solenoid (with Door Closed) Oven Temperature Sensor Meat Probe Sensor
Front Probe - Front Jack - Rear Rear
Lower Oven Blower
CAN BE TESTED AT CONTROL PANEL
Oven Light Transformer
Top
Oven Shutdown Thermal Fuse
Rear
Bake Element
Rear
Convection Element (Lower Oven)
Front
Convection Fan Motor (Lower Oven) Broil Element - Outer (Lower Oven )
Rear Front
Broil Element Inner (Lower Oven)
Front
Microwave Light Transformer (M/W)
Top
Upper Blower (M/W)
Rear
Convection Motor/Fan (M/W) Convection Element (M/W)
Rear Rear
P7-3 (Y) to Neutral (W) P5-8 (V/W) to P5-9 (V/W) P5-4 (Y) to P5-5 (Y) P7-5 (GY/W) to Neutral (W) Primary Winding Secondary Winding P2-4 (R) or P3-1 (OR) to Red Wire at Terminal Block P2-4 (R) to Red Wire at Terminal Block P3-4 (Y) to Red Wire at Terminal Block P7-7 (OR/W) to Neutral (W) P2-1 (BU) to Red Wire at Terminal Block P3-1 (OR) to Red Wire at Terminal Block Primary Winding Secondary Winding P7-6 (VT) to Neutral (W) P10-3 (Y) to Neutral (W) P8-3 (BR) to Neutral (W)
1080 Ω @ 70°F/21.1°C 78k Ω 14 Ω to 18 Ω 40 Ω to 45 Ω Less than 1 Ω Closed Circuit 25 Ω to 30 Ω 33 Ω to 37 Ω 18 Ω 53 Ω to 59 Ω 32 Ω to 35 Ω 40 Ω to 45 Ω Less than 1 Ω 10 Ω to 15 Ω
COMPONENT LOCATIONS Element Relays Electronic Control (Behind Front Panel) Tech Sheet
Blower Motor Main Filter
Latch Relay Oven Light Transformer MW Light Transformer Control Transformer
Membrane Switch
20-Amp Microwave Fuse
Grill Element Halogen Convection Light Fan Motor Assembly & Element Air Pressure on Back Relief Valve & Secondary Interlock Switch
Convection Thermal Fuse Cavity Thermal Fuse Grill Thermal Fuse Rectifier 15-Amp Line Fuse
Turntable Motor
High Voltage Capacitor
Monitor Interlock Switch Primary Interlock Switch Cooling Fan Motor
Magnetron Thermal Fuse
Air Vent Solenoid
Lower Blower Motor Convection Bake Element
High Voltage Transformer Magnetron
Oven Temperature Sensor (Rear) Door Latch Assembly (Solenoid & Latch Switch)
Convection Fan Motor 316°C (600°F) Thermal Switch
Oven Shutdown Thermal Fuse (Rear Panel)
Temperature Bulb in Cavity Halogen Lamp (Sides)
44 Ω 10 Ω to 20 Ω
CONTROL TRANSFORMER
18 (P17-3) T SEC 1
26 VAC 17 (P17-4) T
BK (P17-8) 8 120 VAC PRIMARY 60 Hz W (P17-10) 11
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING UNITED STATES PATENTS: 4,102,322
4,364,589
16 (P17-2) Y SEC 2
24 VAC 15 (P17-1) Y 14 (P17-6) V
SEC 3
7.5 VAC 13 (P17-5) V
4,467,184
OTHER PATENTS PENDING
PART NO. 8300543 REV. E
FOR SERVICE TECHNICIAN'S USE ONLY
