Dacor PCOR30B User manual

PCOR30B
PCOR30R
PCOR30S
Intheinterestofuser-safetytheovenshouldberestoredtoitsoriginalconditionandonlypartsidenticaltothosespecifiedshould
be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage
and current. Contact with the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit
that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier and Heat sink etc.,
and Magnetron, High Voltage Harness etc..)
TABLE OF CONTENTS Page
PRECAUTIONSTOBEOBSERVEDBEFOREANDDURINGSERVICINGTO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDEFRONTCOVER
BEFORESERVICING ...................................................................................................... INSIDEFRONTCOVER
WARNINGTOSERVICEPERSONNEL ................................................................................................................1
MICROWAVEMEASUREMENTPROCEDURE.....................................................................................................2
FOREWORDANDWARNING................................................................................................................................5
PRODUCTSPECIFICATIONS...............................................................................................................................6
GENERAL INFORMATION ...................................................................................................................................6
OPERATION .........................................................................................................................................................8
TROUBLESHOOTINGGUIDE .............................................................................................................................16
TESTPROCEDURE ............................................................................................................................................19
TOUCHCONTROLPANELASSEMBLY .............................................................................................................30
COMPONENTREPLACEMENTANDADJUSTMENTPROCEDURE ..................................................................36
PICTORIALDIAGRAM ........................................................................................................................................45
LSIUNITCIRCUIT...............................................................................................................................................46
PRINTEDWIRINGBOARD .................................................................................................................................47
PARTS LIST........................................................................................................................................................48
PACKINGANDACCESSORIES .........................................................................................................................53
S82M196PCOR3E
PCOR30B
PCOR30R
PCOR30S
MICROWAVEOVEN
MODELS
SERVICE MANUAL
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
distinctive appliances
PCOR30Bshown
MIX CONV
DEFROST
SENSOR
TURNTABLE ON OFF COOK LBS OZ KG HELP

PCOR30B
PCOR30R
PCOR30S
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) Makethefollowingsafetychecksonallovenstobeservicedbeforeactivatingthemagnetronorothermicrowave
source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing
surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and 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 themagnetron,waveguideor transmissionline, andcavityforproperalignment, integrity,
and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmissionsystemsshallberepaired,replaced,oradjustedbyproceduresdescribedinthismanualbeforethe
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.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measure-
ment Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact DACOR immediately @
1-800-793-0093.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven and
2) contact DACOR and Food and Drug Administration's Center for Devices and Radiological Health
immediately.
Servicepersonnel shouldinform DACORof anycertified unitfound withemissions inexcess of4mW/cm2.
Theowneroftheunitshouldbeinstructednottousetheunituntiltheovenhasbeenbroughtintocompliance.
DANGER CAUTION
HIGH VOLTAGE
Do not energize a microwave oven with the outer case cabinet removed, because a microwave oven
generates High Voltage in the circuit.
Ifyou intendtooperatetheovenemployingthe highfrequencyswitchingpowerconvertercircuit,you should
take special precautions to avoid an electrical shock hazard.
The high voltage transformer, high voltage capacitor and high voltage diode have energized high voltage
potential approx. 8 KV.
ThealuminiumheatsinkisconnectedtotheswitchingpowertransistorCollectorpole,andhasanenergized
high voltage potential approx. 650V peak.
DO NOT ACCESS THE HIGH VOLTAGE TRANSFORMER, HIGH VOLTAGE CAPACITOR, HIGH
VOLTAGEDIODEANDHEATSINKWHENTHEPOWERSUPPLYISCONNECTEDTOANELECTRICAL
OUTLET.

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PCOR30R
PCOR30S
NOTES:

2
PCOR30B
PCOR30R
PCOR30S
MICROWAVE MEASUREMENT PROCEDURE (USA)
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
shouldnotexceed1mW/cm2atanypoint5cmormorefromtheexternalsurfaceoftheoven,measuredpriortoacquisition
bya purchaser,andthereafter (throughtheuseful lifeofthe oven),5mW/cm2at anypoint5cm ormorefrom theexternal
surface of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission
in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation
emission in excess of 5 mW/cm2at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Surveyinstrumentsthatcomply with the requirement forinstrumentationasprescribedby the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5½C (68½F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2
in.) and made of an electrically nonconductive material such as glass or plastic.
Theplacingofthisstandardloadintheovenisimportantnotonlytoprotecttheoven,butalsotoinsurethatanyleakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasptheprobeofthesurveyinstrumentandholditperpendiculartothegapbetweenthedoorandthebodyoftheoven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the
metal has been breached (eg., around the switches, indicator, and vents).
Whiletestingforleakagearoundthedoorpullthedoorawayfromthefrontoftheovenasfarasispermittedbytheclosed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.

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PCOR30B
PCOR30R
PCOR30S
MICROWAVE MEASUREMENT PROCEDURE (CANADA)
Afteradjustmentofthedoorswitchesarecompletedindividuallyorcollectively,switchtestandmicrowaveleakagetestmust
beperformedwithsurveyinstrumentandtestresultmustbeconfirmedtomeettherequirementoftheperformancestandard
formicrowaveovensasundermentioned.
A.Requirements:
Everymicrowaveovenshall function in such a manner that when the oven is fully assembled and operating with it's service
controls and user controls adjusted to yield the maximum output, the leakage radiation, at all points at least 5 cm. from the
external surface of the oven, does not exceed:
1) 1.0mW/cm2 with the test load of 275 ± 15 ml of water at an initial temperature 20 ±5oC.
2) 5.0mW/cm2 whentheouterenclosureisremovedwithatestloadof275±15mlofwaterataninitialtemperature20±5oC.
3) 5.0mW/cm2 without a test load.
B.Preparationfortesting:
Beforebeginningtheactualmeasurement ofleakage,proceedasfollows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
SurveyinstrumentsthatcomplywiththerequirementforinstrumentationasprescribedbyCSAandNHWperformancestandard
for microwave ovens must be used for testing recommended instruments are , NARDA 8100 and NARDA 8200.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml of tap water initially at 20±5oC in the center of the oven cavity.
The water container shall be a low form of 600 ml beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made
of an electrically nonconductive material such as glass or plastic.
Theplacingofthisstandardloadintheovenisimportantnotonlytoprotect the oven, but also to insure that any leakage
ismeasured accurately.
4) SetthecookingcontrolonFullPowerCookingMode,Closethedoorandselectacookcycleofseveralminutes.Ifthewater
begins to boil before the survey is completed, replace it with 275 ml of cool water.
C. Leakagetestwithenclosureinstalled :
1) Grasptheprobeofthesurveyinstrumentandholditperpendiculartothegapbetweenthedoorandthebodyoftheoven.
2) Move the probe slowly, not faster than 2.5 cm/sec. along the gap, watching for the maximum indication on the meter.
3) Checkforleakageatthedoorscreen,sheetmetalseamsandotheraccessiblepositionswherethecontinuityofthemetal
hasbeen breached (eg., around the switches, indicator, and vents).
Whiletestingforleakagearoundthedoorpullthedoorawayfromthefrontoftheovenasfarasispermittedbytheclosed
latch assembly.
4) Measurecarefullyatthepointofhighestleakageandmakesurethatthehighestleakageisnogreaterthan4mW/cm2,and
that the secondary interlock switch does turn the oven OFF before any door movement.
C. Leakagetestwithoutenclosure:
1) Removetheenclosure (cabinet).
2) Grasp theprobeofthe survey instrumentandholdit perpendicular toallmechanicaland electric partsoftheoven thatis
accessibletotheuseroftheovenincluding,butnotlimitedto,thewaveguide,cavityseams,magnetrongapbetweenthe
door and the body of the oven.
3) Move the probe slowly, not faster than 2.5 cm/sec. along the gap, watching for the maximum indication on the meter.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is under 5mW/cm2.
CAUTION:SpecialattentionshouldbegiventoavoidelectricalshockbecauseHIGHVOLTAGEisgeneratedduringthistest
NoLoadtest
1) Operate the oven without a load and measure the leakage by the same method as the above test procedure " Leakage
test with enclosure installed"
2. Make sure that the highest leakage should not exceed 5mW/cm2.
NOTE: After servicing, record data on service invoice and microwave leakage report.

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PCOR30B
PCOR30R
PCOR30S
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of pro-
ducing very high voltage and current, contact with
following parts
may result in a severe, possibly
fatal, electrical shock.
(Example)
HighVoltageCapacitor,HighVoltagePowerTrans-
former,Magnetron,HighVoltageRectifierAssem-
bly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Before Servicing
1. Disconnectthe power supply cord , and then
removeouter case.
2. Open the door and block it open.
3. Dischargehighvoltagecapacitor.
WARNING: RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE
SERVICING.
The high-voltage capacitor remains charged about 60
secondsaftertheovenhasbeenswitchedoff.Waitfor60
secondsandthenshort-circuittheconnectionofthehigh-
voltagecapacitor(that is theconnectingleadof the high-
voltage rectifier) against the chassis with the use of an
insulatedscrewdriver.
Whenever troubleshooting is performed the power supply
mustbedisconnected.Itmayin,somecases,benecessary
to connect the power supply after the outer case has been
removed, in this event,
1. Disconnectthepowersupplycord,andthenremoveouter
case.
2. Open the door and block it open.
3. Dischargehighvoltagecapacitor.
4. Disconnect the leads to the primary of the power
transformer.
5. Ensure that these leads remain isolated from other
components and oven chassis by using insulation tape.
6. Afterthatprocedure, reconnect the power supply cord.
Whenthe testing iscompleted,
1. Disconnectthepowersupplycord,andthenremoveouter
case.
2. Open the door and block it open.
3. Dischargehighvoltagecapacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstalltheoutercase(cabinet).
6. Reconnectthepowersupply cord after the outer case is
installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstalltheoutercase(cabinet).
3. Reconnectthepowersupply cord after the outer case is
installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the
presenceofmicrowaveenergywithinacavity,placeacupof
coldwaterontheoventurntable,close thedoorandset the
power to HIGH and set the microwave timer for two (2)
minutes.Whenthetwominuteshaselapsed(timeratzero)
carefullycheckthatthewaterisnowhot.Ifthewaterremains
coldcarryoutBeforeServicingprocedureandre-examine
the connections to the component being tested.
When all service work is completed and the oven is fully
assembled,themicrowavepoweroutputshouldbechecked
and microwave leakage test should be carried out.
Don't Touch !
Danger High Voltag
e

5
PCOR30B
PCOR30R
PCOR30S
PRODUCTDESCRIPTION
GENERALINFORMATION
OPERATION
TROUBLESHOOTINGGUIDEAND
TESTPROCEDURE
TOUCHCONTROLPANEL
COMPONENTREPLACEMENT
ANDADJUSTMENTPROCEDURE
WIRINGDIAGRAM
PARTS LIST
SERVICE MANUAL
MICROWAVEOVEN
PCOR30B
PCOR30R
PCOR30S
FOREWORD
ThisManualhasbeenpreparedtoprovideDacorServicePersonnelwith
OperationandServiceInformationfortheDACORMICROWAVEOVENS,
PCOR30B,PCOR30R&PCOR30S.
Itisrecommended thatservicepersonnelcarefully study theentiretext
ofthismanualandthebasemodel'smanualsothattheywillbequalified
to render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special
attention should be given to avoid electrical shock and microwave
radiationhazard.
WARNING
Never operate the oven until the following points are ensured:
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel. DANGER
Certaininitialpartsareintentionallynotgroundedandpresent
ariskofelectricalshockonlyduringservicing.Serviceperson-
nel - Do not contact the following parts while the appliance is
energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
VoltageRectifierAssembly, HighVoltageHarness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
Allthepartsmarked “*” on parts listareusedatvoltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
1440 Bridge Gate Dr.
Diamond Bar, CA 91765
distinctive appliances

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PCOR30B
PCOR30R
PCOR30S
ITEM DESCRIPTION
PowerRequirements 120Volts/13.2Amperes(Microwave),13.2 Amperes(Convection)-[ULRating]
116Volts/13.2Amperes(Microwave),13.2 Amperes(Convection)-[CSARating]
60Hertz
Singlephase,3wiregrounded
PowerOutput 850watts(IEC-705TESTPROCEDURE)
Operatingfrequencyof2450MHz
ConvectionPowerOutput 1400watts
CaseDimensions Width29-15/16"
Height16-11/32"
Depth 15-9/32"
CookingCavityDimensions Width17-1/8"
Height8-1/16"
1.1 Cubic Feet Depth 13-13/16"
Hoodlamp 2 bulbs, 20W x 2, Incandescent light bulbs
Hoodfan Horizontal discharge 230 C.F.M. , Vertical discharge 240 C.F.M. ,
ControlComplement Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
MicrowavePowerforVariableCooking
Repetition Rate;
P-HI .................................................. Fullpower throughoutthecookingtime
P-90 .................................................................... approx. 90% of Full Power
P-80 .................................................................... approx. 80% of Full Power
P-70 .................................................................... approx. 70% of Full Power
P-60 .................................................................... approx. 60% of Full Power
P-50 .................................................................... approx. 50% of Full Power
P-40 ..................................................................... approx. 40% of Full Power
P-30 ..................................................................... approx. 30% of Full Power
P-20 .................................................................... approx. 20% of Full Power
P-10 ...................................................................... approx. 10% of Full Powe
P-0 ......................................................Nopowerthroughoutthecookingtime
CUSTOM HELP pad, SENSOR COOK pad, COMPU BROIL pad, COMPU ROAST pad
COMPU BAKE pad, SENSOR REHEAT pad, MINUTE PLUS pad, POPCORN pad
COMPU DEFROST pad, CONVECTION pad, REHEAT pad, LOW MIX/BAKE pad
HIGH MIX/ROAST pad, BROIL pad, SLOW COOK pad, KITCHEN TIMER pad
Number and temperature selection pads, CLOCK pad, KEEP WARM pad
TURNTABLE ON / OFF pad, POWER LEVEL pad, STOP/CLEAR pad,
START / TOUCH ON pad, Fan Hi/Lo, Light.
Oven Cavity Light Yes 20W x 1 Incandescent light bulb
SafetyStandard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
CanadianStandardsAssociation.
HealthCANADA, IndustryCANADA.
Weight Approx. 71 lbs.
SPECIFICATION
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
Thisovenisequippedwithathreepronggroundingplug.Itmustbepluggedintoawallreceptaclethatisproperlyinstalledand
groundedinaccordance with theNationalElectricalCode and localcodesandordinances.
Intheeventofanelectricalshortcircuit,groundingreducestheriskofelectricshockbyprovidinganescapewirefortheelectric
current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.

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PCOR30B
PCOR30R
PCOR30S
ElectricalRequirements
The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE
GROUNDINGPINFROMTHEPLUG.
Thepowersupplycordandplugmustbeconnectedtoaseparate120 VoltAC,60Hz,15Amp.ormorebranchcircuit,using
agroundedreceptacle.ThereceptacleshouldbelocatedinsidethecabinetdirectlyabovetheMicrowaveOven/Hoodsystem
mountinglocation.
1. Oven door with see-through window.
2. Door hinges.
3. Sirrer cover.
4. Turntable motor shaft.
5. Oven lamp.
It will light when oven is operating or door is open.
6. Door latches.
The oven will not operate unless the door is securely closed.
7. One touch door open button.
Push to open door.
8. FAN-HI/LO button.
Push for High/Low/Off.
9. Light button.
Push for On/Off
10.Auto-Touch control panel.
11.Time display: Digital display, 99 minutes 99 seconds.
12.Ventilation openings.
13.Light Cover.
14.Grease filters.
15.Removable turntable.
The turntable will rotate clockwise or counterclockwise.
Only remove for cleaning.
16.Removable turntable support.
17.Plug
CONTROL PANEL
MIX CONV
DEFROST
SENSOR
TURNTABLE ON OFF COOK LBS OZ KG HELP
3-Pronged Plug Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
OVEN DIAGRAM
66
1
12
11
10
15
16
9
8
13
14
717
2
35
4
NOTE:
Some one-touch cooking features
as "EASY MINUTE " are disabled
after one minute when the oven is
not used. These features are auto-
maticallyenabledwhenthedooris
opened and closed or the STOP/
CLEARpadispressed.

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PCOR30B
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PCOR30S
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
Thefollowingisadescriptionofcomponentfunctionsduring
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show "Welcome".
Tosetany program or settheclock,youmust first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
COOKINGCONDITION
ProgramdesiredcookingtimetouchingtheNUMBERpads.
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAY CONNECTED COMPONENTS
RY1 Oven lamp
RY2 Power transformer/ Stirrer motor
RY4 Turntable motor
RY5 Fan motor
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2000 volts A.C. on the high voltage winding.
3. Thefilamentwindingvoltageheatsthemagnetronfilament
andtheH.V.winding voltageissenttoavoltagedoubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed-
box, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, secondary switch and third
doorswitchandprimaryinterlockrelayareactivatedwith
thefollowing results.Thecircuitstothestirrermotor, the
cooling fan motor, the turntable motor, and the high
voltage components are de-energized, and the digital
read-outdisplaysthetimestillremaininginthecookcycle
whenthedoorwasopened.
7. Themonitorswitchiselectricallymonitoringtheoperation
ofthesecondaryandthirddoor door switch and primary
interlock relay and is mechanically associated with the
door so that it will function in the following sequence.
(1) When the door opens from a closed position, the
primary interlock relay, door sensing switch,
secondaryandthirddoorswitchopentheircontacts,
and then the monitor switch contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts first open, and then the
contactsofthesecondaryandthirddoorswitchclose.
Iftheprimaryswitch,secondaryswitchandsecondaryinter-
lock relay fail with their contacts closed when the door is
opened, the closing of the monitor switch contacts will form
a short circuit through the monitor fuse, secondary switch
,third door switch and primary interlock relay, causing the
monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
WhenVariableCookingPowerisprogrammed,the120volts
A.C. is supplied to the power transformer intermittently
throughthecontactsofrelay(RY2)whichisoperatedbythe
controlunitwithinanintervalsecondtimebase.Microwave
poweroperationisasfollows:
VARI-MODE ON TIME OFF TIME
Power10(P-HI) 32 sec. 0 sec.
(100%power)
Power9(P-90) 30 sec. 2 sec.
(approx.90%power)
Power8(P-80) 26 sec. 6 sec.
(approx.80%power)
Power7(P-70) 24 sec. 8 sec.
(approx.70%power)
Power6(P-60) 22 sec. 10 sec.
(approx.60%power)
Power5(P-50) 18 sec. 14 sec.
(approx.50%power)
Power4(P-40) 16 sec. 16 sec.
(approx.40%power)
Power3(P-30) 12 sec. 20 sec.
(approx.30%power)
Power2(P-20) 8 sec. 24 sec.
(approx.20%power)
Power1(P-10) 6 sec. 26 sec.
(approx.10%power)
Power0(P-0) 0 sec. 32 sec.
(0%power)
Note: TheON/OFFtimeratiodoesnotcorrespondwiththe
percentage of microwave power, because approx.
2secondsare neededforheating ofthemagnetron
filament.
CONVECTIONCOOKINGCONDITION
PREHEATING CONDITION
Program desired convection temperature by touching the
PREHEAT pad and the temperature pad.
When the START pad is touched, the following operations
occur:

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PCOR30S
1. Thecoilofshut-offrelays(RY1,RY4,RY5 andRY7) are
energized, the oven lamp, turntable motor, cooling fan
motorandconvection motor areturnedon.
2. The coil of relay (RY6) is energized by the control unit.
Thedamperismovedtotheclosedposition,openingthe
damper switch contacts. The opening of the damper
switch contacts sends a signal to the LSI on the control
unit de-energizing the relay (RY6) and opening the
circuit to the damper motor.
3. Thecoilofheaterrelay(RY3)isenergizedbythecontrol
unitandthemainsupplyvoltageisappliedtotheheating
element.
4. Whentheoventemperaturereachestheselectedpreheat
temperature, the following operations occur:
4-1 The heater relay is de-energized by the control unit
temperature circuit and thermistor, opening the
circuit to the heating element.
4-2. The oven will continue to function for 30 minutes,
turningtheheateronandoff,asneededtomaintain
the selected preheat temperature. The oven will
shutdown completely after 30 minutes
CONVECTION COOKING CONDITION
Whenthepreheattemperatureisreached,abeepsignalwill
sound indicating that the holding temperature has been
reachedintheovencavity.Openthedoorandplacethefood
to be cooked in the oven.
Programconvectiontemperatureand desired cooking time
bytouchingthe CONVECTION pad, Temperaturepadand
NUMBER pad.
When the START pad is touched, the following operations
occur:
1. Thenumbersonthe digital read-outstarttocountdown
to zero.
2. The oven lamp, turntable motor, cooling fan motor and
convection motor are energized.
3. Heaterrelay(RY3)isenergized(ifthecavitytemperature
is lower than the selected temperature) and the main
supplyvoltageisappliedtotheheatingelementtoreturn
to the selected cooking temperature.
4. Uponcompletionofthe cooking time,theaudiblesignal
will sound, and oven lamp, turntable motor, cooling fan
motor and convection motor are de-energized. At the
end of the convection cycle, if the oven temperature is
above 275½F, the circuit to RY5 will be maintained (by
the thermistor circuit) to continue operation of the
cooling fan motor until the temperature drops below
245½F, at which time the relay will be de-energized,
turning off the fan motor. Relay RY7 will however, open
as soon as the convection cycle has ended, turning off
the convection motor.
5. At the end of the convection cook cycle, shut-off relay
(RY6) is energized turning on the damper motor. The
damper is returned to the open position, closing the
damper switch contacts which send a signal to the
control unit, de-energizing shut-off relay (RY6).
AUTOMATIC MIX COOKING CONDITION
Touch the LOW MIX/BAKE or HIGH MIX/ROAST pad. The
LOWMIX/BAKEpadispreprogrammedfor325½Fwith10%
microwave power, while the HIGH MIX/ROAST pad is
preprogrammed for 325½F with 30% microwave power.
Program desired cooking time. When the START pad is
touched, the following operations occur:
1. Thenumbersonthedigitalread-outstarttocountdownto
zero.
2. Theshut-offrelays(RY1,RY4,RY5andRY7)areenergized,
turning on the oven lamp, turntable motor, cooling fan
motorandconvection motor.
3. The shut-off relay (RY6) is energized.
The damper plate is closed from the open position.
4. The heater relay (RY3) is energized, applying the main
supply voltage to the heating element.
5. Now, the oven is in the convection cooking condition.
6. When the oven temperature reaches the selected
temperature, the following operations occur:
6-1. The power supply voltage is alternated to the
heating element and power transformer.
6-2. The heating element operates through the heater
relay (RY3) contacts and the power transformer
operates through the primary interlock relay (RY2)
contacts.
6-3. These are operated by the control unit to supply
alternatelywithina32secondtimebase,convection
heat and microwave energy.
The relationship between the convection and microwave
power operations are as follows.
Note: The ON and OFF time ratio does not correspond
with the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
Note: During alternate Microwave/Convection operation,
the convection heater is energized only if the cavity
temperature drops below the set temperature.
SENSOR COOKING CONDITION
Using the SENSOR COOK, SENSOR REHEAT or POP-
CORN function, the foods are cooked or defrosted without
figuringtime,powerlevelorquantity.Whentheovensenses
enough steam from the food, it relays the information to its
microprocessor which will calculate the remaining cooking
time and power level needed for best results.
When the food is cooked, water vapor is developed. The
sensor “senses” the vapor and its resistance increases
gradually. When the resistance reaches the value set
according to the menu, supplementary cooking is started.
12 SEC. 20 SEC.
32 SEC.
LOW MIX
BAKE
HIGH MIX
ROAST
MICROWAVE POWER
= APPROX. 30%
CONVECTION
TEMPERATURE
325ûF (165ûC)
MICROWAVE POWER
= APPROX. 10%
CONVECTION
TEMPERATURE
= 325ûF (165ûC)
26 SEC.6 SEC.
ON
ON
OFF
OFF
OFF
ON
(MICRO.)
(CONVEC.)
(MICRO.)
(CONVEC.)

10
PCOR30B
PCOR30R
PCOR30S
Thetimeofsupplementarycookingisdeterminedbyexperi-
ment with each food category and inputted into the LSI.
An example of how sensor works:
1. Potatoes at room temperature. Vapor is emitted very
slowly.
2. Heatpotatoes. Moisture and humidityisemittedrapidly.
You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
CookingSequence.
1. Touch SENSOR COOK, SENSOR REHEAT or
POPCORN pad. When Sensor Cook is touched, to
choose menu the number pad should be touched.
NOTE: The oven should not be operated on SENSOR
COOK, SENSOR REHEAT or POPCORN
immediately after plugging in the unit. Wait five
minutes before cooking on SENSOR COOK,
SENSOR REHEAT or POPCORN.
2. The coil of shut-off relays (RY1, RY4 and RY5) are
energized, the oven lamp, turntable motor and cooling
fanmotorareturnedon,butthepowertransformerisnot
turned on.
3. Afterabout32seconds,thecookrelay(RY2)isenergized.
The power transformer is turned on, microwave energy
is produced and first stage is started.
The 32 seconds is the cooling time required to remove
any vapor from the oven cavity and sensor.
NOTE: Duringthisfirststage,donotopenthedoorortouch
STOP/CLEAR pad.
4. When the sensor detects the vapor emitted from the
food,thedisplayswitches overto theremaining cooking
time and the timer counts down to zero.
At this time, the door may be opened to stir food, turn it
or season, etc.
5. Whenthetimerreacheszero,anaudible signal sounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
6. OpeningthedoorortouchingtheSTOP/CLEARpad,the
timeof daywillreappear onthedisplayandthe ovenwill
revert to an OFF condition.
COMPUBROIL, COMPU ROAST, COMPUBAKE
COMPU BROIL, COMPU ROAST and COMPU BAKE will
automatically compute the oven temperature, microwave
powerandcookingtimeforbroiling,roastingandbaking.Set
thedesiredprogrambytouchingoneoftheCOMPUBROIL,
COMPU ROAST or COMPU BAKE pad, and number pad.
Enter the weight by touching the Number pads. When the
START pad is touched, the following operations occur:
1. The COOK indicator will light and the CONV or MIX
indicator will light.
2. The cooking time will appear on the display and start
counting down to zero. The cooking time is adjusted
automatically according to the weight of the food.
3. The shut-off relays (RY1, RY4, RY5 and RY7) are
energized, turning on the oven lamp, turntable motor,
cooling fan motor and convection motor. The power
supply voltage is applied to the heating element.
4. Now, the oven is in the convection cooking mode or
Automatic Mix Cooking condition.
5. When the oven temperature has reached the
programmed convection temperature, the oven goes
into the programmed cooking mode.
6. At the end of the cooking cycle, the damper is returned
to the open position and the oven will go to the off
condition. The cooling fan will remain on until the oven
has cooled.
COMPUDEFROSTCOOKING
The COMPU DEFROST key is a special function key to
defrost meats and poultry faster and better. COMPU
DEFROST automatically defrosts roast beef, etc.. When
the COMPU DEFROST is selected and the food weight is
enteredby using the COMPU DEFROST pad, the oven will
cook according to the special cooking sequence.
FIRESENSINGFEATURE(MICROWAVEMODE)
This model incorporates a sensing feature which will stop
theoven'soperationifthereisafireintheovencavityduring
microwave cooking.
This is accomplished by the LSI repeatedly measuring the
voltage across the temperature measurement circuit (ther-
mistor) during it's 32-seconds time base comparing the
obtainedvoltagemeasurements.Ifthemostrecent voltage
measured is 100mV greater than the previous voltage
measured, the LSI judges it as a fire in the oven cavity and
switches off the relays to the power transformer and fan
motor. The LSI also stops counting down and closes the
damper plate so that no fresh air will enter the oven cavity.
Please refer to the following section for a more detailed
description.
Operation
The following operation will start 4 minutes after the start
pad is touched. Please refer to the timing diagrams below.
1. The thermistor operates within a 32-seconds time base
and it is energized for three (3) seconds and off for 29
seconds. Two (2) seconds after the thermistor is
energized, the voltage across the temperature
measurement circuit is sampled by the LSI and twenty
one (21) seconds after the thermistor is cut off the LSI
turns on the convection motor for six (6) seconds.
2. The above procedure is repeated. If the difference
between the first voltage measured (in step 1) and the
voltagemeasuredwhentheprocedureisrepeated(step
2) is greater than 100mV the LSI makes the judgment
that there is a fire in the oven cavity and will switch off
MICROWAVE
MICROWAVE
AH SENSOR

11
PCOR30B
PCOR30R
PCOR30S
therelaystothepowertransformerandfanmotor.TheLSI
alsostopscountingdownandclosesthedamperdoorso
that no fresh air will enter the oven cavity.
3. Once the fire sensor feature has shut the unit down, the
programmedcookingcyclemayberesumedby pressing
the"START"padortheunitmayberesetbypressingthe
"CLEAR"pad.
IMPORTANT:
Duringsensorcookingoperation,thefiresensingopera-
tion sequence will not begin until the AH sensor has
detected vapors and initiated a sensor cooking cycle.
This is because the operation of the convection fan
wouldinterferewiththeAHsensor'svapordetection.
VENTILATION METHODS HOT AIR EXHAUST
1. VERTICALVENTING
For this venting method, hot air rising from the
conventional range below is drawn in by the hood fan
motorthroughthegreasefiltersattherightandleftsides
ofthebasecover,upthroughtherightandleftsideintake
ducts,thendischargedverticallyatrearcentertopofthe
oven, into the customer's vent system.
2. HORIZONTALVENTING
TheairhandingissameasVERTICALVENTINGexcept
that the final air discharge is directed horizontally out
from the top rear of the oven into the customer's vent
system.
CONVECTION
MOTOR
THERMISTOR
Sensing
Voltage
ON
OFF
ON
OFF
ON
OFF
0 2 24 30 64 (sec.)
3 sec.
Sensing the voltage across the temperature measurement circuit.
6 sec.
332 (sec.)
: AIR FLOW
GREASE
FILTER
HOOD
INTAKE
DUCT R
HOOD FAN MOTOR
TO DUCTTO DUCT
: AIR FLOW
GREASE
FILTER
HOOD
INTAKE
DUCT R
HOOD FAN MOTOR
TO DUCT
3. RE-CIRCULATION(INSIDEVENTING)
TheairhandingissameasVERTICALVENTINGexcept
that the final air discharge is directed horizontally
through the upper front of the oven into the kitchen. IN
this case, the accessory charcoal filter lit RK-220 must
be provided to filter the air before it leaves the oven.
: AIR FLOW
HOOD
INTAKE
DUCT R
HOOD EXHAUST
LOUVER
HOOD FAN MOTOR
CHARCOAL
FILTER

12
PCOR30B
PCOR30R
PCOR30S
Figure O-1. Oven Schematic - Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. START PAD TOUCHED.
Figure O-2. Oven Schematic - Microwave Cooking Condition
HIGH
VOLTAGE
RECTIFIER
HIGH
VOLTAGE
CAPACITOR
0.9 F
POWER
TRANSFORMER
MAGNETRON
RY8
HL HL
HOOD
LAMP
HOOD
MOTOR
HOOD
CAPACITOR
GRY BRN
BRN
C1A3A1
GRY BLU
RED YEL
HOOD FAN
THERMAL
CUT OUTS
BLK
RED
FUSE
20A
RED RED
MAGNETRON
TEMPERATURE
FUSE
C3
BRN
C9
BLK
C5
C7
BLU
PPL
WHT BLK
RED
YEL PNK
RY1 0
RY9
WHT
WHT
RED
BLK
BLK
BLU
MONITOR
SWITCH
STIR-
RER
MOTOR
WHT
BRN
BLK
F1 F2 F3
E3 E4E6E5E2E1
RY1RY7RY4RY5RY6
DAMPER
THERMISTOR SWITCH
HEATING
ELEMENT
DOOR
SENSING
SWITCH
BLK
GRN
PNK
RED
N.O.
RY3
PPL
COM
RY3
COM
RY2
N.O.
RY1
DAMPER
MOTOR
FAN
MOTOR
OVEN
LAMP
ORG
OLCMFM
TTM DM
CONVE-
CTION
MOTOR
SECONDARY
INTERLOCK
SWITCH
TURN
TABLE
MOTOR
ORG
WHT
ORG BLK
BLK ORG
ORG
ORG
BLK
BRN WHT
BRN PPL
GRY
B7B1B3B5
A5
ORG
BLU
WHT
PPL
COM
RY1
N.O.
RY2
AH SENSOR
WHT WHT
RY3 RY 2
CONTROL UNIT
STM
GRY
THIRD DOOR
SWITCH
120VAC
60Hz
BLK
WHT
GRN
GND
NOISE
FILTER
NOISE
RESISTOR
PNK
PRIMARY INTERLOCK RELAY
BLU
HIGH
VOLTAGE
RECTIFIER
HIGH
VOLTAGE
CAPACITOR
0.9 F
POWER
TRANSFORMER
MAGNETRON
RY8
HL HL
HOOD
LAMP
HOOD
MOTOR
HOOD
CAPACITOR
GRY BRN
BRN
C1A3A1
GRY BLU
RED YEL
HOOD FAN
THERMAL
CUT OUTS
BLK
RED
FUSE
20A
RED RED
MAGNETRON
TEMPERATURE
FUSE
C3
BRN
C9
BLK
C5
C7
BLU
PPL
WHT BLK
RED
YEL PNK
RY10
RY9
WHT
WHT
RED
BLK
BLK
BLU
MONITOR
SWITCH
STIR-
RER
MOTOR
WHT
BRN
BLK
F1 F2 F3
E3 E4E6E5E2E1
RY1RY7RY4RY5RY6
DAMPER
THERMISTOR SWITCH
HEATING
ELEMENT
DOOR
SENSING
SWITCH
BLK
GRN
PNK
RED
N.O.
RY3
PPL
COM
RY3
COM
RY2
N.O.
RY1
DAMPER
MOTOR
FAN
MOTOR
OVEN
LAMP
ORG
OLCMFM
TTM DM
CONVE-
CTION
MOTOR
SECONDARY
INTERLOCK
SWITCH
TURN
TABLE
MOTOR
ORG
WHT
ORG BLK
BLK ORG
ORG
ORG
BLK
BRN WHT
BRN PPL
GRY
B7B1B3B5
A5
ORG
BLU
WHT
PPL
COM
RY1
N.O.
RY2
AH SENSOR
WHT WHT
RY3 RY 2
CONTROL UNIT
STM
THIRD DOOR
SWITCH
120VAC
60Hz
BLK
WHT
GRN
GND
NOISE
FILTER
NOISE
RESISTOR
PNK
PRIMARY INTERLOCK RELAY
GRY
BLU

13
PCOR30B
PCOR30R
PCOR30S
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CONVECTION PAD TOUCHED.
3. DESIRED TEMP. TOUCHED.
4. START PAD TOUCHED.
Figure O-3. Oven Schematic - Convection Cooking Condition (CONVEC, PREHEAT, BROIL, SLOW COOK)
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. MIX COOKING PAD TOUCHED.
3. DESIRED TEMP. TOUCHED.
4. COOKING TIME PROGRAMMED.
5. START PAD TOUCHED.
Figure O-4. Oven Schematic - Automatic Mix cooking Condition
NOTE: RY2 and RY3 will alternately close during cook cycle
Ref 2-6(TMAPCB063MRR0)
HIGH
VOLTAGE
RECTIFIER
HIGH
VOLTAGE
CAPACITOR
0.9 F
POWER
TRANSFORMER
MAGNETRON
RY8
HL HL
HOOD
LAMP
HOOD
MOTOR
HOOD
CAPACITOR
GRY BRN
BRN
C1A3A1
GRY BLU
RED YEL
HOOD FAN
THERMAL
CUT OUTS
BLK
RED
FUSE
20A
RED RED
MAGNETRON
TEMPERATURE
FUSE
C3
BRN
C9
BLK
C5
C7
BLU
PPL
WHT BLK
RED
YEL PNK
RY10
RY9
WHT
WHT
RED
BLK
BLK
BLU
MONITOR
SWITCH
STIR-
RER
MOTOR
WHT
BRN
BLK
F1 F2 F3
E3 E4E6E5E2E1
RY1RY7RY4RY5RY6
DAMPER
THERMISTOR SWITCH
HEATING
ELEMENT
DOOR
SENSING
SWITCH
BLK
GRN
PNK
RED
N.O.
RY3
PPL
COM
RY3
COM
RY2
N.O.
RY1
DAMPER
MOTOR
FAN
MOTOR
OVEN
LAMP
ORG
OLCMFM
TTM DM
CONVE-
CTION
MOTOR
SECONDARY
INTERLOCK
SWITCH
TURN
TA B L E
MOTOR
ORG
WHT
ORG BLK
BLK ORG
ORG
ORG
BLK
BRN WHT
BRN PPL
GRY
B7B1B3B5
A5
ORG
BLU
WHT
PPL
COM
RY1
N.O.
RY2
AH SENSOR
WHT WHT
RY3 RY2
CONTROL UNIT
STM
THIRD DOOR
SWITCH
120VAC
60Hz
BLK
WHT
GRN
GND
NOISE
FILTER
NOISE
RESISTOR
PNK
PRIMARY INTERLOCK RELAY
GRY
BLU
Ref 2-6(TMAPCB063MRR0)
HIGH
VOLTAGE
RECTIFIER
HIGH
VOLTAGE
CAPACITOR
0.9 F
POWER
TRANSFORMER
MAGNETRON
RY8
HL HL
HOOD
LAMP
HOOD
MOTOR
HOOD
CAPACITOR
GRY BRN
BRN
C1A3A1
GRY BLU
RED YEL
HOOD FAN
THERMAL
CUT OUTS
BLK
RED
FUSE
20A
RED RED
MAGNETRON
TEMPERATURE
FUSE
C3
BRN
C9
BLK
C5
C7
BLU
PPL
WHT BLK
RED
YEL PNK
RY10
RY9
WHT
WHT
RED
BLK
BLK
BLU
MONITOR
SWITCH
STIR-
RER
MOTOR
WHT
BRN
BLK
F1 F2 F3
E3 E4E6E5E2E1
RY1RY7RY4RY5RY6
DAMPER
THERMISTOR SWITCH
HEATING
ELEMENT
DOOR
SENSING
SWITCH
BLK
GRN
PNK
RED
N.O.
RY3
PPL
COM
RY3
COM
RY2
N.O.
RY1
DAMPER
MOTOR
FAN
MOTOR
OVEN
LAMP
ORG
OLCMFM
TTM DM
CONVE-
CTION
MOTOR
SECONDARY
INTERLOCK
SWITCH
TURN
TABLE
MOTOR
ORG
WHT
ORG BLK
BLK ORG
ORG
ORG
BLK
BRN WHT
BRN PPL
GRY
B7B1B3B5
A5
ORG
BLU
WHT
PPL
COM
RY1
N.O.
RY2
AH SENSOR
WHT WHT
RY3 RY2
CONTROL UNIT
STM
THIRD DOOR
SWITCH
120VAC
60Hz
BLK
WHT
GRN
GND
NOISE
FILTER
NOISE
RESISTOR
PNK
PRIMARY INTERLOCK RELAY
GRY
BLU

14
PCOR30B
PCOR30R
PCOR30S
DOOR OPEN MECHANISM
Thedoorisopenedbypushingtheopenbuttononthecontrol
panel, refer to the Figure D-1.
Whentheopenbuttonispushed,theopenbuttonpushesup
theopenlever, and thentheopenlever pushes upthelatch
head.Thelatchheadsaremovedupwardandreleasedfrom
latch hook. Now the door will open.
FigureD-1. DoorOpen Mechanism
SECONDARY SWITCH, THIRD DOOR SWITCH &
DOOR SENSING SWITCH
The secondary switch and third switch mounted parrallel to
each other horizontally in the upper positions of the latch
hook,thedoorsensingswitchismountedhorizontallyinthe
upper position of the latch hook. They are activated by the
latchheadonthedoor.Whenthedoorisopened,theswitches
interruptthepowertoallhighvoltagecomponents,exceptthe
oven lamp . A cook cycle cannot take place until the door is
firmly closed thereby activating all interlock switches. The
secondary interlock system consists of the door sensing
switchandtheprimaryinterlockrelay locatedon thecontrol
circuitboard.
MONITORSWITCH
Themonitorswitchisactivated(thecontactsopened)bythe
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative, by means of
blowing the monitor fuse, when the contacts of the primary
switch and secondary switch fail to open when the door is
opened.
Functions:
1. Whenthedoorisopened,themonitorswitchcontactclose
(to the ON condition) due to their being normally closed.
At this time the secondary interlock relay, primary switch
and secondary switch are in the OFF condition (contacts
open) due to their being normally open contact switches.
2. As the door goes to a closed position, the monitor switch
contactsarefirstopenedandthenthedoorsensingswitch,
primary switch and secondary switch contacts close. (On
openingthedoor,eachoftheseswitchesoperateinversely.)
3. If the door is opened, and the secondary interlock relay,
primary switch and secondary switch contacts fail to
open,themonitorfuseblowssimultaneouslywithclosing
of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE, TEST THE SECONDARY INTERLOCK
RELAY,SECONDARYSWITCH,DOORSENS-
ING SWITCH, MONITOR SWITCH AND PRI-
MARY SWITCH FOR PROPER OPERATION.
(REFERTOCHAPTER"TESTPROCEDURE").
NOTE: MONITOR FUSE, PRIMARY SWITCH AND
MONITOR SWITCH ARE REPLACED AS AN
ASSEMBLY.
TEMPERATURE FUSE (MG)
The temperature fuse located near the waveguide is de-
signedtopreventdamagetothemagnetronifanoverheated
condition develops in the tube due to cooling fan failure,
obstructed air guide, dirty or blocked air intake, etc.
Undernormaloperation,thetemperaturefuseremainsclosed.
However,thetemperaturefusewillopenat302½F(150½C)
causing the oven to shut down.
THERMALCUT-OUT (HOOD )
This thermal cut-out located on the base plate right. It is
designed to automatically turn on the hood fan motor
whenever the hot air rising from the conventional range
belowcausesthetemperatureatthethermalcut-outtorise
to 140½F (60½C) or higher, thus removing this hot air from
aroundmicrowaveoven.Whenthetemperaturearoundthe
thermal cut-out drops to 113½F (45½C) or lower, the
thermal cut-out shuts off the food fan motor.
TURNTABLEMOTOR
The turntable motor rotates the turntable located on the
bottomoftheoven cavity, so that the foods ontheturntable
cook evenly during cooking. Turntable will turn in either
direction.The turntablemotorcan beturnedoff bytouching
TURNTABLE ON/OFF pad.
COOLINGFANMOTOR
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes
surrounding the magnetron and cools the magnetron. This
air is channelled through the oven cavity to remove steam
and vapors given off from the heating foods. It is then
exhausted through the exhausting air vents at the oven
cavity.
HOODFAN MOTOR
The hood fan motor is a two-speed, single-phase, double
pole induction type, requiring a hood fan capacitor. It is
located outside the upper rear part of the oven cavity, is to
remove, from around the oven, hot air rising from the
conventional electric or gas range over which it is installed.
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.
DESCRIPTION AND FUNCTION OF COMPONENTS
THIRD
DOOR
SWITCH
DOOR
LATCH HOOK
LATCH
HEADS DOOR SENSING
SWITCH
MONITOR
SWITCH
SECONDARY
INTERLOCK
SWITCH
OPEN LEVER
MONITOR FUSE

15
PCOR30B
PCOR30R
PCOR30S
STIRRER MOTOR
The stirrer motor drives the stirrer fan to stir the microwave
radiationfromthewaveguide.
HOOD LAMP
Thehoodlampsaremountedatthehoodlampangleonthe
basecover.Whenthehoodlampbuttonispushed,thehood
lamprelay(RY8)contactscloseturningbothhoodlampson.
HEATING ELEMENT
The heating element is located at the left side of the oven
cavity.Itisintendedtoheatairdrivenbytheconvectionfan.
The heated air is kept in the oven and force-circulated and
reheatedbytheheatingelement.
CONVECTION COOKING SYSTEM
This oven is designed with a hot air heating system where
food is not directly heated by the heating element, but is
heated by forced circulation of the hot air produced by the
heating element.
The air heated by the heating element is circulated through
theconvectionpassageprovided on the outercasingofthe
oven cavity by means of the convection fan which is driven
bytheconvectionmotor.Itthenenterstheinsideoftheoven
throughtheventholesprovidedon the left side of the oven.
Next, the hot air heats the food on the turntable and leaves
the oven cavity through the vent in the center of the oven
cavity left side wall.
Without leaving the oven, this hot air is reheated by the
heating element, passes through the convection passage
andenterstheinsideoftheovencavityagain,inacontinuing
cycle.
In this way, the hot air circulates inside the oven cavity to
raise its temperature and, at the same time, comes into
contact with the food being cooked.
When the temperature inside the oven cavity reaches the
selectedtemperature,theheatingelementisde-energized.
When the temperature inside the oven cavity drops below
theselectedtemperature, theheatingelement isenergized
again.Inthisway,theinsideoftheovencavityismaintained
at approximately the selected temperature.
When the convection time reaches 0, the heating element
isde-energizedandtheconvectionfanstopsoperatingand
the oven shuts off.
DAMPEROPEN-CLOSEMECHANISM
Usually, the damper is in the open position except during
convection cooking. Damper position is set automatically
by damper motor, damper switch and motor cam. These
components are operated by a signal that judges if micro-
wave cooking or convection cooking operation is selected
by the control unit.
Microwave Cooking:
Damperisintheopenposition,becauseaportionofcooling
air is channeled through the cavity to remove steam and
vapors given off from the heating foods.
It is then exhausted at the top of the oven cavity into a
condensation compartment.
Convection Cooking:
Damper is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.
DamperOperation
1. Whenpowersupply cord is plugged in:
1-1. When power supply cord is plugged in, a signal is
sensedinthecontrolunit,andoperatesshut-offrelay
(RY6).
1-2. Contacts of shut-off relay (RY6) close, the damper
motor is energized, opening the damper plate.
1-3. When the damper is moved to the open position by
the damper cam the damper switch is closed (ON
position).
1-4. The signal from damper switch is re-sensed in the
control unit and shut-off relay (RY6) is turned off.
1-5. The120 voltsA.C.to thedamper motorisremoved
and the motor turns off.
2. When oven is microwave cooking:
Damper is in the open position.
3. When oven is convection cooking:
3-1. Damper motor is energized by touching the
convection,temperature,numberandSTARTpads.
3-2. When damper is in the closed position (damper
switch is OFF), its signal is sensed by the control
unit, and shut-off relay (RY6) is de-energized.
3-3. Thedamperisheldintheclosedpositionduringthe
convection cooking operation.
3-4. At the end of the convection cooking, shut-off relay
(RY6) is energized, and the damper is returned to
the open position.
NOTE: If the damper plate is not in the proper position,
closedduringconvectionoropenduringmicrowave,
the control unit will stop oven operation after 1
minute.
FigureD-2.DamperMechanism
DAMPER CAM
DAMPER MOTOR
DAMPER SWITCH
DAMPER PLATE

16
PCOR30B
PCOR30R
PCOR30S
TROUBLESHOOTING GUIDE
Nevertouchanypartinthecircuitwithyourhandoranuninsulatedtoolwhilethepowersupplyisconnected.
Whentroubleshooting themicrowave oven,itishelpfultofollowthe Sequenceof Operationinperformingthechecks.Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter
which will be found in the "Test Procedure "section.
IMPORTANT: Iftheovenbecomesinoperativebecauseofablown monitorfuse,checkthesecondaryswitch,doorsensing
switch, secondary interlock relay(RY2), primary switch and monitor switch, before replacing the monitor
fuse. If the monitor fuse is replaced, the monitor switch and primary switch must also be replaced. Use part
FFS-BA018/KIT as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,
be necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensurethattheleadsremainisolatedfromothercomponentsandovenchassisbyusinginsulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.

17
PCOR30B
PCOR30R
PCOR30S
MAGNE POWERTRANSFORMER H.V.RECTIFIER HIGHVOLTAGECAPACITOR PRIMARYORDOORSENSINGSWITCH PRIMARYINTERLOCKSYSTEM MONITORSWITCH DAMPERSWITCH MONITORFUSE TEMPERATUREFUSE(MG) HOODTHERMALCUT-OUT THERMISTOR
TROUBLESHOOTING GUIDE
Whentroubleshooting themicrowave oven,itishelpfultofollowthe Sequenceof Operationinperformingthechecks.Many
ofthepossiblecausesoftroublewillrequirethataspecifictestbeperformed.Thesetestsaregivenaprocedureletterwhich
will be found in the "Test Procedure" section.
CK = Check / RE = Replace
CONDITION
TEST PROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
ABCDEFGHIJK L
OFF
CONDITION
IDLE
CONDITION
COOKING
CONDITION
(COMMON)
PROBLEM
Home fuse blows when power cord is plugged into wall receptacle.
Monitor fuse blows when power cord is plugged into wall receptacle.
Display does not illuminate when power cord is first plugged into wall recepta-
cle.
Display does not operate properly when STOP/CLEAR key is touched. (The
time of day should appear on the display with beep sound during normal
condition.)
Oven lamp does not light with door is opened.
Hoodfan motor operateswhen power cordis first pluggedinto wall receptacle.
Temperatureofovenbaseseemsmorethan140½F(60½C)becauseofoperation
of the range below. But hood fan motor does not turn on automatically.
(Normally, food fan motor should be operating at low speed.)
Hood lights do not turn on with pushed HOOD LAMP button.
Hood fan motor does not rotate at all with pushed FAN button.
Speedof the hood fanmotor does not change when the FAN button is touched
for this function.
Ovenlamp does notlight in cookcycle. (But itdoes light whendoor is opened.)
Fan motor does not operate. (Oven lamp and turntable motor operate.)
Turntable motor does not operate (Oven lamp lights and fan motor operate.)
Cooking cycle runs 1 minute then shuts down.
Oven does not go into cook cycle when START pad is touched
Ovenseemstobeoperatingbutlittleornoheatisproducedinovenload.(Food
incompletely cooked or not cooked at all at end of cook cycle.)
Ovengoes intoa cook cycle but extremelyuneven heatingis produced in oven
load (food).
Variable cooking does not operate properly except Cooking Power 10 (P-HI)
mode.
Function of COMPU DEFROST does not operate properly.
Stirrer motor does not operate. (Other parts operate.)
CONV indicator lights, but oven does not go into cook cycle when START pad
is touched.
CONV indicator lights, but heating element does not heat.
Temperature in the oven cavity is lower or higher than preset.
Convection motor does not operate.
Convection cycle runs 4 minutes and 15 seconds then shuts down.
The oven stops and "ERROR" is displayed or does not end during Sensor
Cooking condition. (Oven does not shuts off after a cup of water is boiling by
Sensor Cooking.)
Oven stops at 32 seconds after starting.
MICROWAVE
COOKING
CONDITION
CONVECTION
COOKING
CONDITION
SENSOR
COOKING
CONDITION

18
PCOR30B PCOR30R PCOR30S
HOODFANMOTOR
DAMPERMOTOR
CONVECTIONHEATER
CHECKINGTEMPERATURE
CONTROLUNIT
KEY UNIT
RELAY(RY1)
RELAY(RY2)
RELAY(RY3)
RELAY(RY4)
RELAY(RY5)
RELAY(RY6)
RELAY(RY7)
RELAY(RY8)
RELAY(RY9)
RELAY(RY10)
FOIL PATTERN ON PWB.
AHSENSOR
OVEN LAMP OR SOCKET
FANMOTOR
TURNTABLEMOTOR
STIRRERMOTOR
TURNTABLEOFFCONDITION
CONVECTIONMOTOR
HOODLAMPOR SOCKET
HOODMOTORCAPACITOR
SHORTEDOROPENED WIRING
SHORTEDINPOWERCORD
NOPOWER AT OUTLET
LOWVOLTAGE
NOISEFILTER
MNOPQRSSSSSSSSSSUVRERERERECKCKRECKRERECKCKW
IMPORTANT: Iftheovenbecomesinoperativebecauseofablownmonitorfuse,checkthemonitorswitch,primaryinterlock
relay,door sensing switch and secondary interlock switch before replacingthe monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/KIT as an assembly.