MICROWAVE OVEN HOODS

IMPORTANT SAFETY NOTICETHIS INFORMATION IS INTENDED FOR USE BY INDIVIDUALS POSSESSING ADEQUATE BACKGROUNDS IN ELECTRICAL, ELECTRONIC AND MECHANICAL EXPERIENCE. ANY ATTEMPT TO REPAIR A MAJOR APPLIANCE MAY RESULT IN PERSONAL INJURY AND PROPERTY DAMAGE. THE MANUFACTURER OR SELLERCANNOT BE RESPONSIBLE FOR THE INTERPRETATION OF THIS INFORMATION, NOR CAN IT ASSUME ANY LIABILITY IN CONNECTION WITH ITS USE.

DISCONNECT POWER BEFORE SERVICING.IMPORTANT-RECONNECT ALL GROUNDING DEVICESALL PARTS OF THIS APPLIANCE CAPABLE OFCONDUCTING ELECTRICAL CURRENT ARE GROUNDED.IF GROUNDING WIRES, SCREWS, STRAPS, CLIPS, NUTSOR WASHERS USED TO COMPLETE A PATH TO GROUNDARE REMOVED FOR SERVICE, THEY MUST BERETURNED TO THEIR ORIGINAL POSITION ANDPROPERLY FASTENED.

PRECAUTIONS TO BEOBSERVED BEFORE ANDDURING SERVICING TO AVOIDPOSSIBLE EXPOSURE TOEXCESSIVE MICROWAVEENERGY.

OPERATED WITH THE DOOR OPEN.

MAGNETRON.

1. INTERLOCK OPERATION2. PROPER DOOR CLOSING3. SEAL AND SEALING SURFACES

(ARCING, WEAR AND OTHER DAMAGE)4. DAMAGE TO OR LOOSENING OF HINGES AND

LATCHES 5. EVIDENCE OF DROPPING OR ABUSE

ANY SERVICE TEST OR INSPECTION WITHIN THEMICROWAVE GENERATING COMPARTMENTS,CHECK THE MAGNETRON, WAVE GUIDE AND CAVITYFOR PROPER ALIGNMENT, INTEGRITY ANDCONNECTIONS.

B. DO NOT OPERATE OR ALLOW THE OVEN TO BE

C. IF THE OVEN OPERATES WITH THE DOOR OPEN: 1. INSTRUCT THE USER NOT TO OPERATE THE OVEN. 2. CONTACT THE MANUFACTURER AND THE CENTER

MICROWAVE OVENS (MWOs) BEFORE ACTIVATING THED. CHECK THE FOLLOWING SAFETY ITEMS ON ALL

E. BEFORE TURNING ON MICROWAVE POWER FOR

A. IF OVEN IS OPERABLE, PERFORM MICROWAVEEMISSION CHECK PRIOR TO EXAMINING THE UNIT.

FOR DEVICES RADIOLOGICAL HEALTH IMMEDIATELY.

IN THE INTERLOCK MONITOR, DOOR SEAL ANDMICROWAVE GENERATION AND TRANSMISSIONSYSTEMS SHALL BE REPAIRED, REPLACED ORADJUSTED BY PROCEDURE DESCRIBED IN THISMANUAL BEFORE THE OVEN IS RELEASED TO THEOWNER.

F. ANY DEFECTIVE OR MISADJUSTED COMPONENTS

G. A MICROWAVE LEAKAGE CHECK TO VERIFY COMPLIANCE WITH THE FEDERAL PERFORMANCE STANDARD SHOULD BE PERFORMED ON EACH OVEN PRIOR TO RELEASE TO THE OWNER.

GROUNDING SPECIFICATIONSLeakage Current 0.5 mA. (Max.)Ground Path Resistance 0.14 ohm (Max.)

INSTALLATION REQUIREMENTSELECTRICALMWO Power Power Source Line Current Over Current Protection * Requires 120 volt, 20 Amp. parallel, grounded separatecircuit.Working Voltage

1000 Watts

14.5 Amps. (1700 Watts)120 VAC, 60 Hz.

20 Amps*

108-132 VAC

MICROWAVE LEAKAGE TEST1. Place 275 ml. water in 600 ml. beaker (WB64 x 5010).2. Place beaker in center of oven glass.3. Set meter to 2450 MHz scale.4. Turn “on” for 5 minute test.5. Hold probe perpendicular to surface being tested and scan surfaces at rate of one inch/sec.

6. Maximum leakage 4 mW/cm

Test the following areas:• Entire perimeter of door and control panel• Viewing surface of door window• Exhaust vents

NOTE: Maximum allowable leakage is 4 mW/cm is used to allow for measurement and meteraccuracy.

Inform the manufacturer of any oven found to have emission inexcess of 5 mW/cm.2 Make repairs to bring the unit intocompliance at no cost to owner and try to determine cause.Instruct owner not to use oven until it has been brought intocompliance.

2

2

5 mW/cm2

WARNINGTO PREVENT ELECTRICAL SHOCK, USE EXTREME CAUTIONWHEN DIAGNOSING OVEN WITH OUTER CASE REMOVE DAND POWER "ON". THE HIGH VOLTAGE SECTION OF THEPOWER SUPPLY, INCLUDING FILAMENT LEADS, HAVETHE POTENTIAL WITH RESPECT TO GROUND TOREACH 4000 VOLTS!

HIGH VOLTAGE CAPACITORThe high voltage capacitor has an internal shunt resistor toautomatically discharge the capacitor when the oven turns“off”. Under normal operation the capacitor should fullydischarge within 30 seconds.

WARNINGALWAYS BE CERTAIN THE CAPACITOR IS DISCHARGED BEFORE SERVICING. DISCHARGE BY PLACING AN INSULATEDHANDLE SCREW DRIVER BETWEEN THE DIODE CONNECTION AND OVEN CHASSIS GROUND.

PERFORMANCE TEST1. Measure line voltage( loaded). This test is based on normal voltage variations of 108V to 132V. Low voltage will cause low output power and temperature rise.2. Place WB64 X0073 beaker containing one liter of water (1000ml, 55°F~75°F) on turntable and record the starting water tempreture with an accurate thermometer.

(DO NOT USE ANY OTHER LOAD OR DISH AS RESULT WILL VARY FROM STANDARD !)3. Set at HIGH power for 2 minutes, and 3 sec.4. Turn on the oven.5. Record end water temperature. The minimum difference between the initial and ending temperature should be: 30°F @ 120 V.

HOW TO TEST INTERLOCKS1. Disconnect power, open control panel, and discharge capacitor.2. Check Continuity of Com and N.O.: • Door Closed - 0 Ω • Door Open - ∞ Ω

• TECHNICAL DATA SHEET •

INTERLOCKS (DOOR Latch Switches)Interlocks are designed as follows:Primary - Top switch operated by top latch pawl connected to line (L) leg.

B

C

A Primary Switch

Secondary Switch

Monitor Switch

MONITOR SWITCHThe monitor switch B is located between the top and bottominterlocks. The monitor switch is operated indirectly by thebottom latch pawl.

HOW TO TEST MONITOR1. Disconnect power, open control panel, and dischargecapacitor.2. Disconnect monitor switch leads, and test at terminals: • Door Closed - ∞ Ω • Door Open - 0 Ω3. Reconnect switch wiring.4. Test Circuit Operation:

A) Connect temporary jumper across relay contacts andprimary switch to simulate shorted switch contacts. Locateconvenient connections in circuit to be certain COM andN.O. terminals are used.B) Connect Ohm meter (low scale) across the two lineterminals of appliance power cord.Continuity must show: • Door Closed - Some Ω • Door Open - 0 ΩC) Remove 20 Amp. Fuse - Circuit must open (∞ Ohms).If not, check wiring of monitor and interlock circuits.D) WARNING After test remove temporary jumper leads!from interlocks and relay. Reconnect monitor switchleads, replace fuse.E) Replacement of any parts in monitor circuit requiresrepeating this entire test procedure.

IMPORTANT: Check for microwave leakage after replacingor adjusting door, Interlock switches or brackets.

PRIMARY S/WMONITOR S/W

DOOR SENSE S/W

MAIN FUSE

WARNINGWHEN 20 AMP. FUSE IS BLOWN DUE TO OPERATION OF THEMONITOR SWITCH, THE MONITOR SWITCH MUST BE REPLACERELAYS AND/OR INTERLOCK SWITCHES WHEN CONTINUITY CHECK SHOWS CONTACTS SHORTED.

INTERLOCK REPLACEMENT:The switch housing is not adjustable. It is fixed on the front cavitywith 2 screws.

IMPORTANT: CHECK FOR MICROWAVE LEAKAGE AFTER REPLACING OR ADJUSTING DOOR, INTERLOCK SWITHES OR BRACKETS.

CAUTIONWhen safety interlocks and monitor switches are repaired orreplaced, check microwave leakage• Perform microwave leakage check, if leakage does not exceed 4 mW/cm , it is performing properly.

AUTOMATIC FAN FEATUREExhaust fan may turn "ON" automatically during heavy surface heat loads. In this condition, the exhaust fan cannot be turned off manually, it will turn off automatically. The exhaust fan may stay on up to 15 mins after range and lower oven controls are turned off.

HOOD THERMOSTATSingle pole thermostat mounted on R.H. side duct in controlcompartment. Contacts close at approx. 158°F.

BOTTOM THERMOSTATSingle pole thermostat mounted on base plate. Contacts openat approx. 248°F.

DOOR ASSEMBLYThe door assembly is serviceable as an assembly or withparts.1. Disconnect power and open the door.2. Remove the hinge clip.3. Remove the door.

H.V. TRANS FUSEWARNING! When 20 Amp, fuse is blown due to operation of theH.V. Trans failure mode, the H.V. Trans fuse must be replaced.

MICROWAVE OVEN HOODS

WARNINGTO AVOID POSSIBLE ELECTRICAL SHOCK, NEVER TOUCH OR SERVICE THE HIGH VOLTAGE CIRCUIT WITHOUT DISCHARGING CAPACITOR BY SHORTING ACROSS ITS THERMINALS. Printed in China

Publish No. : 31-41079-1261800

CAVITY THERMOSTAT CUTOUT(FLAME SENSOR)The Cavity Thermal Cutout is located on the top side of the Oven Cavitybeside exhaust duct with a temperature rating of 230°F (110°C). Thecutout is tightly held to the top of the oven cavity by a spring clip.

NOTE: if cutout cannot be removed from clip, oven will have to be removed from installation and outer case removed.

SMART BOARD:The SMART BOARD contains the power relay, vent blowertriac surface, light relays, and other components to performthe proper switching circuits. Several disconnect plugs are alsolocated on the SMART BOARD:• CN3 - Ribbon Connector• CN2 - Door Sensing Connector• CN100 - Main Relay, Vent Relay, Turntable Relay, Cooktop

To Service Turntable (on/off) Motor1. Disconnect power and remove bottom plate screws(6).2. Remove bottom plate and disconnect the turntable motor wire.3. Remove the turntable screws(2) and pull the turntable motor.

MAGNETRON, MAGNETRON FAN, VENTBLOWER, CAPACITOR, DIODE AND POWER TRANSFORMEROven must be removed from the wall to service.

REMOVING OVEN FROM WALL(2 PEOPLE REQUIRED)Oven hooked on metal tabs at bottom of wall mounting plate andfastened to cabinet by top cabinet bolts (3).

CAUTIONOven weighs about 63 Ibs.Requires 2 people for removal.1. Disconnect Power Cord.2. Remove top cabinet bolts (3).3. Pull unit forward slowly, providing adequate support to prevent dropping units4. Disconnect duct and remove damper assembly.5. Drop unit during removal of last top cabinet bolt.

ERROR MESSAGEDisplay Signal:• KEYPAD SHORTED--SERVICE MAY BE NEEDED• Description Keypanel shorted continuously for 60 seconds.

CONTROL PERFORMANCE TEST• Set Clock-Touch clock pad one time, enter time of day.• Alternately, touch each function pad and enter time, power level or selection for the selected function.• Touch CANCEL/OFF after each function test to clear that function.• Repeat procedure for each function to exercise each pad.• Control and display should respond to each entry.• Display should revert to Time-Of-Day after each CANCEL/OFF. Refer results to Diagnostic Flow Chart.

KEY PANEL TESTIf necessary the key panel pads can be vertified by a continuity test. For ease of handling the key panel should be removedand placed on a flat surface. Check continuity between connections at end of ribbon (Use high Ω scale).

PADPOPCORNBEVERAGEREHEATPOTATOCOOK TIMEDEFROST W/TTIMER ON-OFFADD 30 SECPOWER LEVELCLOCKSURFACE LIGHTVENT FANTURNTABLE

Connector Pin Voltage Connector Pin Voltage1 13 24 15 36 47 58 69 7

10 811 9

CN3 5V

CN2 5V

CN100 120V

2

CONN1-82-83-84-85-86-87-83-101-113-114-115-116-11

PAD1234567890START/PAUSECANCEL/OFF

CONN1-92-93-94-95-96-97-97-106-105-102-117-11

317864

SMPS SWICHING MODE POWER SUPPLY

SCHEMATIC DIAGRAM WIRING DIAGRAM

Printed in China Publish No. : 31-41079+-1

MWO TROUBLESHOOTING FLOW CHART

4

3

LL

COOKTOP

LAMP

5

MOTOR

CAPACITOR

8

HOOD THERMAL

CUT-OUT

(40/70)

7

1

LAMP

REL

AY

MAIN RELAY

(RELAY 1)

L.V.T

ON (RY3)

LOW(RY7)

T.P.

VENT

6

HI (RY6)

VENT

REL

AY

T/T RELAY(RELAY 8)

9

WH

13

4

6

5

120V

125V

NOTE: Connection is polarity sensitive. Assemble correctly.DOOR: CLOSED COOK: OFF

12.2A

12.2A

12.2A

12.2A

12.2A

12.2A

0.26A

0.26A

0.047A

0.047A

0.24A 0.24A

0.24A

0.24A

0.24A

0.24A

12.2A

12.2A

0A

0.47A

0.47A

0.065A

0.065A

0.6A

0.35A

0.6A

1.3A

1.3A

BR

CN2

CN100

MONITOR

INTERLOOK

SWITCH

WH WH

WH

CONT

ROL

P.W.

B. A

SS'Y

BKBK

YW YW

GN&YW

GN

WHBKFUSE

FILTER ASS'Y

ONLY

POWER SUPPLY :

SINGLE PHASE

PRIMARY

INTERLOCK ( UPPER)

(12 0

/0)

BOTTOM THERMAL CUT-OUT

MGT THERMAL

CUT-OUT

(16 0

/0)

CAVITY THERMAL

CUT-OUT

(11 0

/0)

DOOR

SENSE

SWITCH (BOTTOM)

OG

31 WH

32 YW

BKBL

GYRD

WH

RDYW

GN

YWYWBL

YW

BK

WH

OG

YW

BK

BKBR

H.V.

DIOD

EH.

V.TR

ANS

FAF

11

H.V.

CAPA

CITO

R MAGN

ETRO

N

POWER RELAY

(RELAY 2)

12

TTM

TURNTABLE

MOTOR

120V

FMFAN

MOTOR

125V

OVEN

LAMP

L

PK

WHITE WH

BLACK BK

RED RD

YELLOW YW

GREEN GN

GRAY GY

BLUE BL

ORANGE OG

BROWN BR

COLOR SYMBOL

PINK

1

2YW-32

WH-31

BK-24

BL-25

GY-26

GN-23

OR-18

BR-22

RD-5

T/TABLE

MOTORR=3.4K Ω

WH-16

YW-21GN-23WH-30YW-19

YW-21YW-19BL-20

WH-15

COOKTOPLAMP(L)

COOKTOP

LAMP(R)

VENT

MOTORBL-25

WH-30

RD-28

YW-29

OG-27

1

6

MGTT.C.O

CAVITYT.C.O

BOTTOM

T.C.O

HOODT.C.O

FANMOTOR

YW-2BK-3

YW-1YW-2

BK-3BK-4RD-5

GY-26BK-24OG-27

BK-17WH-15

OG-18

PRIMARYINTERLOCK

SWITCH

YW-7

YW-6

BK-8

BK-4

BL-20

BK-17

YW-6

GN-28

YW-29

WH-11

WH-9

BK-8

OVENLAMP

MOTOR

CAPA

CITORC=10uF

MONITOR

INTERLOCKSWITCH

NOISEFILTER

WH-12

BR-22

YW-1

DOOR

SENSING

SWITCH

BK WH

G

BK

WH

BK WH

WH-11

BK-10

WH-9

POWER

CORD

H.V.CAPACITOR

H.V.TRANS

MGTTUBE

RD

RD

RDRDFA

F

WH-12

BK-10

P

C

B

CN100

CN3

MAINRELAY

WH-16

YW-7

10

1CN2

NOISEFILTER

BR

WH

YW

3 2 1

6 5 4

2

3

4

5

COLOR SYMBOL

WHITE WH

BLACK BK

RED RD

YELLOW YW

GREEN GN

GRAY GY

BLUE BL

ORANGE OG

BROWN BR

JVM3160JNM3161AVM4160RVM5160