Sharp MMD24B, MMD24S manual Micro, Fm A, Cn-A, Cn-H, 60Hz, Figure S-2. Power Unit Circuit

Page 34
CN-A

MMD24S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MMD24B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

2

 

 

3

 

 

4

 

 

5

6

 

CN-A

 

 

 

T1

 

 

 

 

 

 

 

 

 

 

 

2.5A

 

PA154DR

D1 -- D4

 

 

 

 

 

 

 

 

A-7

 

3

5

1N4002L x4

 

 

CN-H

 

 

 

 

A

 

FUSE

 

 

D4

 

 

VR

 

 

A

 

 

 

D1

 

 

 

 

AC 120V

 

 

 

 

 

 

 

 

 

 

 

 

 

VRS1

 

 

 

 

 

H-1

 

K-1

 

 

60Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

10G471K

 

 

 

 

 

 

 

 

 

 

 

A-5

 

 

 

 

 

 

D3

0.1uF/50V

 

1000uF/50V

 

 

 

 

 

 

 

 

 

 

1

8

D2

+

 

 

 

 

 

 

 

 

 

 

 

 

C1

C2

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-3

K-3

 

 

B

 

 

 

 

 

 

 

 

 

 

 

INT

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-2 K-2

 

 

 

 

 

 

 

 

 

RY5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D12

 

 

 

SW Reg.

 

 

 

 

 

 

 

 

 

 

 

 

 

PWR

 

 

C

 

 

 

 

 

 

 

 

 

 

H-8

K-8

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

502-3

 

 

 

 

 

 

 

 

 

 

 

 

 

H- 9 SW Reg. OUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+24V

 

 

 

 

 

 

 

 

 

 

 

 

 

H-11

E-3

 

 

 

 

 

 

 

 

 

J10

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

RY2

 

 

 

 

 

 

 

D

N.O.

 

 

 

 

 

 

 

 

 

 

 

 

 

MICRO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D5

 

 

 

 

 

 

 

 

 

COM

 

 

 

 

 

 

 

 

 

H-4

K-4

 

 

E

 

 

 

 

 

 

RY1

 

 

 

 

 

 

 

E

COM

N.O.

 

 

 

 

 

 

 

 

H-6

K-6

 

 

 

 

 

 

 

D7

 

 

 

 

 

(O.L)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(C11)

 

 

 

 

 

 

 

J11

 

 

 

 

 

 

 

 

0.1u

250V

 

 

 

 

 

 

 

 

 

 

 

(R11)

 

1/2W

120

 

 

 

 

 

 

<NOTE>

 

F

 

 

 

 

 

 

 

 

 

: IF NOT SPECIFIED, 1SS270A

F

 

B-1

 

 

 

 

 

 

 

 

 

 

 

(

) : NOT INSERT PARTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B-3

 

1/2W

120

 

 

 

 

 

 

 

 

: CHECK POINTS

 

 

 

(R10)

 

RY3

 

 

 

 

 

 

 

 

 

 

 

 

250V

 

 

 

 

 

 

 

 

 

G

 

(C10)

0.1u

 

D10

 

 

 

 

 

 

 

G

SM

A-1

 

 

 

 

H-5 K-5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RY4

 

 

 

 

 

 

 

 

FM A-3

 

 

 

 

 

D11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-7

K-7

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

Figure S-2. Power Unit Circuit

 

 

1

 

 

2

 

 

 

3

 

 

4

 

 

5

6

 

 

 

 

 

 

 

 

 

34

 

 

 

 

 

 

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Page 33 Page 35
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
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