Samsung RS2777, RS2544, RS2666, RS2622 manual Fan Motor Bldc Drive Circuit, Motor drive circuit

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Circuit Descriptions

2-1) CoolSelect ZoneTM Drawer is controlled by a damper to supply or block cold air. For Quick Cool, the damper will be close. So cold air is supplied only to CoolSelect ZoneTM Drawer. For Thaw, the evaporator heater of refrigerator is ON and the damper is controlled by the refrigerator temperature.

2-2) The stepping motor controlled by a Driver IC TA7774P(IC7) operates the damper. The stepping motor uses 4 combined signals to open and close the damper.

Note) To prevent the malfunction from a high humidity, a DC 12V, 1 watt heater is mounted and activated continuously.

10-8) Fan Motor (BLDC) Drive Circuit

1) Motor drive circuit

1-1) This refrigerator adopts a BLDC motor froeduce energy consumption, Motors of the freezer, refrigerator and the machine compartment are composed of the BLDC. For RS2533, R-fan is operated by AC 115V Motor.

1-2) Voltages between high-speed and low-speed

		Voltage of motor			Remark

	Measure b (F-FAN)	Measure C (R-FAN)		Measure d(C-FAN)	In the normal operation, MICOM No. 40, 41 and 42 applies a constant frequency; and

High	11.1V	10V		10V	MICOM defects the signal to check the failure of motor.
					(frequency(Hz)×12 = motor rpm)
Low	10V	10V		8.3V	(frequency(Hz)×12 = motor rpm)
Low	10V	10V		8.3V

Note) Under the conditions, the fans will be operated in 2 options, such as High and Low mode. Generally, it is operated in the High mode during a day time and in the Low mode at night.

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Contents Model RS2544 RS2622 RS2644 RS2666 RS2777 Important Safety Notice Contents Xtra FreshTM Door AlarmMulti-Flow System Xtra SpaceTMIt does not fall on you Cover using a screwdriver, and then disconnectTo protect refrigerator in movement With the door closed, remove the upper hingeProduct R Refrigerator Label Location NomenclatureModels Company NameFreezer Refrigerator SpecificationsWarranty information Refrigerator Interior Views and DimensionsShelves and Bins FreezerDimensions of Refrigerator Inches Capillary Tube Refrigeration Cycle and Cool Air Circulation RouteRefrigerant Route in Refrigeration cycle Freezer Evaporator DryerCool Air Circulation Freezer Refrigerator PlasticWire Drawer in Freezer······························ Mechanical DisassemblyRefrigerator Disassembly Freezer DisassemblyDoor Gasket Control PanelDoor Handle Beverage StationTMPlastic Drawers in Refrigerator Refrigerator Door Light SwitchRefrigerator Light Tempered Glass ShelfEvaporator Fan Motor Water FilterUpper Ductwork Evaporator Cover in the RefrigeratorCoolSelect ZoneTM Thermistor Evaporator in RefrigeratorRefrigerator Thermistor CoolSelect ZoneTM ThermistorFreezer Shelf Freezer Door Light SwitchPlastic Wire Drawer in Freezer Door Bin in FreezerUnlock the locking tabs to separate the ice maker kit Ice maker is located inside of the ice dispenser assemblyDisconnect the ice maker wire connector Auger Motor CaseEvaporator Cover in Freezer Freezer LightIce-MakerThermistor Evaporator in FreezerFreezer Thermistor Ambient ThermistorSub-condenser Machine Compartment ＆ Electric BoxWater Solenoids Condenser FanOperation Function Digital Panel Temperature Control FunctionPower FreezeQuick Ice function Quick Ice and Power Cool FunctionsChild Lock Function Ice & Water Dispenser Function Fan Motor Delay Function of the Machine CompartmentCoolSelect ZoneTM Function RS2666,RS2777 Filter Indicator Water Filter Indicator FunctionIce-Maker Function ·MICOM Port Preparation of Ice-makerInitial Operation function Judgement RemarkHeater OFF Water Supply functionDefrost Function Heater onDefrost operation Sound Function Beeps will cease immediately when the doors are closedSelf-Diagnostics Function Self-Diagnostics in the initial Power onError items LED Display Details Remarks ErrorError items of self-diagnostics Function errorSet Point Shift Function Restoration Function for Power OutageThis mode, only the display LEDs for temperature will be on Load Operation Check FunctionTable of Set Point Shift Function Shift the freezer temperature sensorOperation Function Shift the Ice maker temperature sensor Shift the CoolSelect ZoneTM temperature sensorCircuit Descriptions Terminal Source Power CircuitReset Circuit Oscillator CircuitChange Temperature Sensing CircuitDoor S/W Sensing Circuit MicomKey Scan and Display Circuit DEF-sensor and Bimetal work in parallelKey Scan and display operation Key Scan CoolSelect ZoneTM Panel Circuit Motor drive circuit Fan Motor Bldc Drive CircuitVoltages between high-speed and low-speed D602 Eeprom CircuitOption Circuit Load Drive CircuitCOMP. equivalence circuit of drive section Normal DiagnosticsIf power is not on StartConnection AssemblyIf the compressor and cooling fan motor don’t work normally Check after a lapse of 5 minExchange and troubleshoot Corresponding sensor If defrost functionPerform forced defrosting for F Room at a time Check if the iced solder of main PCB is Short If the temperature sensor of F and R room has troubleIf there is a trouble with self-diagnosis If the ambient sensor has trouble StartRemove causes after If alarm soundIf Ding-Dong sounds continuously Start If Beep sounds continuously StartMain PCB is normal buzzer normal Without sound of buzzer operation StartDisplay’ ZoneTM panel If the panel PCB is not working normallyDoor close If fan doesn’t work ReferenceConnections of door S/W Door open DCPanel PCB has trouble for itself If CoolSelect ZoneTM isn’t operated normally RS2555, RS2577If the lamp of CoolSelect ZoneTM is not lit Start If the Panel PCB key isn’t selectedIs the inside lamp filament cut? If the lamps of freezer / refrigerator does not lightCheck the operation of SSR71 and Q701 If Crushed Ice/Cubed Ice doesn’t work properly Safety Instructions on Service ∼DC 12V load working condition Appendix ⅠReference for circuit diagnosticsDC 0V Stop Condition Resistance valueRef. Def heater For safety, you must turn the power off LoadValue Contents Ref Check a loadLamp Lamp on the REF Ref Check Door S/W749 878834 791Part Name Specifcation ’TY Ref Service part lists of each circuit boardPage Page Refrigerator Division 2003 Code DA82-00001D Electronics