Samsung RS2*3* 5-7DAMPER CIRCUIT, 5-8DISPLAY Circuit, Operation Principles By Parts Of Circuit

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5-7) DAMPER CIRCUIT

OPERATION PRINCIPLES BY PARTS OF CIRCUIT

5-7) DAMPER CIRCUIT

1)The temperature of R-room is controlled by opening and closing of damper with stepping motor, supplying & blocking cold air.

2)TA7774P (IC07) operates the damper. TA7774P is the driver IC only for step motor. If the regular signal is provided to TA7774P from Micom, send combined signal to Quad-Polar step motor to rotate on certain direction. This makes clockwise or counter clockwise rotation to make the damper open or close.

3)Since the damper always touches the cold air, DC 12V/1W heater is installed, always on to prevent the malfunction from moisture and is controlled on conditions. (Operation conditions can be changed). Micon #15 pin connected to IC4 controls the damper heater like category 3.

5-8) DISPLAY Circuit

1) KEY SCAN

When Grid #6 is output, this signal goes through PCB resistance 10 and provided to power frequency. When the switch is pressed, R502(6.8 ) and R501 (12 ) decrease the signal and less than 5.1V peak to peak signal is provided to MICOM, the MICOM recognizes the grid #6 is provided, and change the function corresponding to switch key. [Refer the circuit diagram below]

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Contents Model SAMSUNG Home Appliance ServiceRS2*3* RS2*2* RS2*1 SIDE-BY-SIDEREFRIGERATORIMPORTANT SAFETY NOTICE Technical Service Guide CopyrightSAMSUNG ELECTRONICS AMERICA, INC Contents 1. Safety Instructions on Service SAMSUNG REFRIGERATOR 2. Warranty informationLIMITED WARRANTY TO ORIGINAL PURCHASER One 1 Year Parts and Labor on Refrigerator3-1Refrigerator Disassembly 3. Mechanical Disassembly3-2Freezer Disassembly 3-3Machine Compartment DisassemblyControl Panel Refrigerator Door Light SwitchDoor Handle Door GasketRefrigerator Light Mechanical DisassemblyTempered Glass Shelf Gallon Door BinRefrigerator Thermistor Damper in the RefrigeratorTwin cool in the Refrigerator Mechanical DisassemblyPlastic Wire Drawer in Freezer Freezer Door Light SwitchDoor Bin in Freezer Freezer ShelfIce Dispenser & Ice Maker Auger Motor CaseMechanical Disassembly Evaporator Fan Motor Freezer LightEvaporator Cover in Freezer Mechanical DisassemblyIce-MakerThermistor Evaporator in FreezerFreezer Thermistor Mechanical DisassemblyWater Solenoids Machine Compartment & Electric BoxCondenser Fan Condenser4. CIRCUIT DIAGRAM 5-1POWER 5. OPERATION PRINCIPLES BY PARTS OF CIRCUIT5-2OSCILLATION CIRCUIT 5-3RESET CIRCUIT OPERATION PRINCIPLES BY PARTS OF CIRCUIT5-4EEPROM DETECTION CIRCUIT OPERATION PRINCIPLES BY PARTS OF CIRCUIT 5-5DOOR SWITCH DETECTON CIRCUITCategory DoorOPERATION PRINCIPLES BY PARTS OF CIRCUIT 5-6TEMP SENSING CIRCUITTemp to Resistance of Sensor & MICOM PORT Voltage OPERATION PRINCIPLES BY PARTS OF CIRCUITSensor CHIP PX41C Standard Temp5-8DISPLAY Circuit 5-7DAMPER CIRCUITOPERATION PRINCIPLES BY PARTS OF CIRCUIT 1 KEY SCANOPERATION PRINCIPLES BY PARTS OF CIRCUIT 2 DISPLAY OPERATIONGRID WAVE PATTERN OPERATION PRINCIPLES BY PARTS OF CIRCUIT 5-9Load Control CircuitOPERATION PRINCIPLES BY PARTS OF CIRCUIT 5-10ICE MAKER OPERATION CIRCUITOPERATION PRINCIPLES BY PARTS OF CIRCUIT 5-11OPTION Circuit6-1Freezer 6. Illustrated Parts Catalog6-2Refrigerator Illustrated Parts Catalog6-3Cabinet Illustrated Parts CatalogIllustrated Parts Catalog 6-4Disassembly of Freeze DoorIllustrated Parts Catalog 6-5Disassembly of Refrigerator DoorRef.1 Measure Load Terminals Appendix ⅠReference for circuit diagnosticsLOAD DEFECTSRef.2 Check SENSOR Appendix ⅠReference for circuit diagnosticsELECTRONICS 272, Oseon-Dong, Kwangsan-Gu Kwangju-City,KoreaTEL 82-62-950-6810,6811 FAX