Sharp MMD24B, MMD24S manual Schematic Off Condition, Closed, Cook Off Condittion, Door

Page 10
SCHEMATIC (OFF CONDITION)

MMD24S

MMD24B

SCHEMATIC (OFF CONDITION)

 

MAGNETRON

 

H.V. RECTIFIER

 

 

 

 

 

 

 

 

 

 

 

 

 

CAPACITOR

 

 

 

 

 

 

 

xxx µF

 

 

 

 

 

 

 

AC 2300V

 

 

 

THIRDDOOR SWITCH YLWor YLWor

POWER TRANSFORMER

 

 

GRY

 

 

 

N.O.COM

 

 

 

 

 

RED

 

 

 

 

 

 

 

 

 

COM

N.C.

 

 

WHT

 

 

 

 

WHT

ORG BLK

RED or BLK

MONITOR SWITCH

N.O.

BLU

 

DOOR POSITION SWITCH REAR

BRN

 

 

 

M5

GRN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GRN

DOOR POSITION FRONT

RED or BLK

B1

 

M4

GRN*2

 

 

 

GRY

GRN

 

 

 

 

M1

GRN

DOOR SENSING SWITCH

 

 

 

GRN

 

GRY

PRIMARY INTERLOCK RELAY

WHT

 

 

 

 

 

 

 

 

 

 

SWITCH

 

INTERLOCK

BLK

 

YLWor

SECONDARY

BRN

BLK

 

ORG

STIRRER MOTOR

COM

 

ORG or

 

SM

BLU

A1

 

 

 

YLW

 

 

 

 

 

 

 

 

FAN MOTOR

 

 

 

N.O.

RED

 

FM

GRY

 

A3

*2

 

 

or

 

 

 

 

 

 

 

BLK *2

 

 

 

 

COM

OVEN LAMP

 

 

N.O.

 

 

OL

 

 

 

 

RED *2

WHT

 

 

WHT

 

BLK *2

 

 

 

or

 

 

 

 

 

GRY

 

 

 

 

 

 

 

F3

 

 

 

 

 

 

F2

 

 

 

HUMDITY

 

 

F1

 

 

 

 

 

 

 

 

 

SENSOR

 

 

 

 

RY2

 

 

 

 

M3

GRN

 

 

 

 

 

N5

BLK

 

 

 

 

 

UNIT

 

RY3

 

 

N4

YLW

 

 

 

 

 

 

 

 

CONTROL

N3

BLU

 

 

 

 

 

 

 

 

 

 

N2

DM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RY4

 

 

 

 

N1

ORG

 

 

 

 

 

 

 

RED

 

RY1

 

 

 

 

COM

 

LOWVOLTAGE TRANSFORMER

 

 

 

 

 

 

 

 

 

 

RY5

 

 

 

 

 

 

 

 

 

A7

A5

H11

 

 

E3

E1

H9

 

 

 

 

RED

BLK RED

CN502

 

 

 

CN502

2

 

 

 

 

 

 

CN502

 

3

 

 

 

 

 

 

1

 

 

 

RED

WHT

 

GRN

SWITCHING REGULATOR

 

 

CN501

1

 

 

 

GRY

 

 

 

 

MOTOR

DOOR OPEN-CLOSE

MICROWAVE DRAWER

WHT

WHT

MICROWAVE DRAWER

backview

toHotwire(RED)

CLOSED, COOK OFF CONDITTION)

THERMAL

OVEN

OUTCUT-

THERMAL CUT

MAG

OUT-

ORG

RED

BLK

BLK

CN501 3

 

 

or

 

 

 

ORG

 

 

 

 

WHT

 

 

 

 

 

GRY

RED

 

"TO LOAD"

 

"TO LOAD"

 

 

 

 

 

 

 

 

 

 

0.0033 µF 250V

 

0.0033 µF 250V

 

 

 

LINE BYPASS CAPACITOR

LINE BYPASS CAPACITOR

 

 

 

NOISE SUPRESSION COIL

 

 

 

LINE CROSS CAPACITOR 1.0 µF 275V

FUSE

 

RESISTOR 470 k 1/2W

20A

 

 

 

 

L

 

 

 

 

 

NOISE FILTER

GRY

WHT

N

/WireColorssubjecttochangewithoutnotice.

ontherightsideonlampsocket's neutralwire.

to

locatedis

connected

that

be sensor.humidityuteabsoltheusemodelscertain connectedbemustterminalLead)(FinishTransformer

(DOOR

"TO SOURCE"

 

GRN

GND

 

"TO SOURCE"

 

 

 

 

 

BLK

H

 

N

WHT

NOTES:

1.Circuits

must

3.Only 4.Power

Terminal2.

10

Image 10
Contents WARNING TO SERVICE PERSONNEL TABLE OF CONTENTSWARNING TO SERVICE PERSONNEL MICROWAVE MEASUREMENT PROCEDUREBEFORE SERVICING Before Servicing WARNING TO SERVICE PERSONNELAfter repairing When the testing is completedA. Requirements MICROWAVE MEASUREMENT PROCEDUREB. Preparation for testing C. Leakage testSERVICE MANUAL DANGER1440 Bridge Gate Dr Diamond Bar, CA If provided, Vent Hood, Fan assembly, Cooling Fan MotorMICROWAVE DRAWER SPECIFICATION DESCRIPTIONGENERAL INFORMATION GROUNDING INSTRUCTIONSDESCRIPTION OF OPERATING SEQUENCE POWER LEVEL P-0 TO P-90 COOKINGOPERATION OFF CONDITIONCooking Sequence SENSOR COOKING CONDITIONMICROWAVE CLOSED, COOK OFF CONDITTION SCHEMATIC OFF CONDITIONDOOR A TOUCH CONTROL PANEL ASSEMBLY TEST TEST PROCEDURESPROCEDURE Before testingB KEY UNIT TEST COMPONENT TESTC RELAY TEST STEPS Check supply voltage and oven power cordDEFROST TEST The rated AC voltage is not present betweenF AH SENSOR TEST Checking the initial sensor cooking condition TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNITWater load cooking test CHECKING CONTROL UNIT R1, R2 22Ω ± 1% 1/2W R3 4.3kΩ ± 5% 1/4W R4 1MΩ ± 5% 1/4WMICROWAVE OUTPUT POWER Refer to the disassembly instructions found on PageG MAGNETRON ASSEMBLY TEST H THERMAL CUT-OUT TESTJ STOP SWITCH TEST I SECONDARY INTERLOCK SWITCH TESTK MONITOR SWITCH TEST M POWER TRANSFORMER TEST L BLOWN MONITOR FUSE TEST4 Reset Circuit TOUCH CONTROL PANEL ASSEMBLYControl Unit and Power Unit 5 Indicator CircuitInternal clock oscillation frequency setting input DESCRIPTION OF LSI IC-1Power source voltage 0V GND Power source voltage +5VSignal coming from touch key SignalSegment data signal Signal similar to P23Signal to sound buzzer Magnetron high-voltage circuit driving signalCommon relay driving signal. Square Waveform 60Hz Signal to synchronize LSI with commercial power source frequency1 Structure of Humidity Sensor HUMIDITY SENSOR CIRCUITventilation opening for sensing 2 Operational Principle of Humidity Sensor4. Other Precautions TOUCH CONTROL PANEL SERVICING1 Servicing the touch control panel with power supply of the oven 2. Servicing of Touch Control Panel1. Employing lead-free solder PRECAUTIONS FOR USING LEAD-FREE SOLDER2. Using lead-free wire solder 3. SolderingWARNING AGAINST HIGH VOLTAGE COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREWARNING FOR WIRING To prevent an electric shock, take the following pre- cautionsMICROWAVE DRAWER DISASSEMBLY Un-hook/Attach White AC Wire to Bottom Terminal POWER CORD REPLACEMENTUn-hook/Attach Black AC Wire to Top Terminal Un-hook/Attach Ground to metal Tab on Back PlateRe-install STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVALSTOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT After adjustment, check the followingDRAWER/SLIDE RAIL REMOVAL DRAWER ASSEMBLY AND CHOKE REMOVALDRAWER SUPPORT ANGLE REMOVAL 1. Follow the Microwave Drawer disassembly as previouslyACTUATOR REMOVAL/ADJUSTMENT SWITCH ANGLE REMOVAL/ADJUSTMENTSWITCH ANGLE REMOVAL Actuator adjustmentRACK GEAR REMOVAL AUTO DRAWER GEAR REMOVAL/INSTALLATIONBottom cover InstallationHIGH VOLTAGE COMPONENTS to Back PlateFM A Figure S-2. Power Unit CircuitMICRO CN-AUNIT UNITCONTROL F G H2.5A Figure S-4. Printed Wiring Board of Power UnitA B C D E F G H 5.PrintedWiringBoard UnitControlofCOPYRIGHT 2008 BY DACOR, INC ALL RIGHTS RESERVED