Samsung RS2666, RS2544, RS2622, RS2777 manual Key Scan

Page 41

Circuit Descriptions

The step signals of DC 11∼ 12V will be generated periodically. If a sink signal outputs from IC4, DC 11-12V will be applied to the LED input terminal and sink the LED output terminal to 0V. Therefore, LED will be ON for 2 miliseconds.

2) Key Scan

The 6 step signals, Q6∼Q4 are applied to scan the 6 keys (buttons). When SW6 is pressed, the step signal from Q6 will be reduced to 5V and entered to the MICOM, then MICOM will match a corresponding function for SW6 key.

Image 41

Contents Model RS2544 RS2622 RS2644 RS2666 RS2777 Important Safety Notice Contents Multi-Flow System Door AlarmXtra SpaceTM Xtra FreshTMTo protect refrigerator in movement Cover using a screwdriver, and then disconnectWith the door closed, remove the upper hinge It does not fall on youModels NomenclatureCompany Name Product R Refrigerator Label LocationFreezer Refrigerator SpecificationsWarranty information Shelves and Bins Interior Views and DimensionsFreezer RefrigeratorDimensions of Refrigerator Inches Refrigerant Route in Refrigeration cycle Refrigeration Cycle and Cool Air Circulation RouteFreezer Evaporator Dryer Capillary TubeCool Air Circulation Freezer Refrigerator Refrigerator Disassembly Mechanical DisassemblyFreezer Disassembly PlasticWire Drawer in Freezer······························Door Handle Control PanelBeverage StationTM Door GasketRefrigerator Light Refrigerator Door Light SwitchTempered Glass Shelf Plastic Drawers in RefrigeratorUpper Ductwork Water FilterEvaporator Cover in the Refrigerator Evaporator Fan MotorRefrigerator Thermistor Evaporator in RefrigeratorCoolSelect ZoneTM Thermistor CoolSelect ZoneTM ThermistorPlastic Wire Drawer in Freezer Freezer Door Light SwitchDoor Bin in Freezer Freezer ShelfDisconnect the ice maker wire connector Ice maker is located inside of the ice dispenser assemblyAuger Motor Case Unlock the locking tabs to separate the ice maker kitEvaporator Cover in Freezer Freezer LightFreezer Thermistor Evaporator in FreezerAmbient Thermistor Ice-MakerThermistorWater Solenoids Machine Compartment ＆ Electric BoxCondenser Fan Sub-condenserOperation Function Digital Panel Temperature Control FunctionChild Lock Function Quick Ice and Power Cool FunctionsPower FreezeQuick Ice function CoolSelect ZoneTM Function RS2666,RS2777 Fan Motor Delay Function of the Machine CompartmentIce & Water Dispenser Function Ice-Maker Function Water Filter Indicator FunctionFilter Indicator Initial Operation function Preparation of Ice-makerJudgement Remark ·MICOM PortDefrost Function Water Supply functionHeater on Heater OFFDefrost operation Self-Diagnostics Function Beeps will cease immediately when the doors are closedSelf-Diagnostics in the initial Power on Sound FunctionError items of self-diagnostics ErrorFunction error Error items LED Display Details RemarksThis mode, only the display LEDs for temperature will be on Restoration Function for Power OutageLoad Operation Check Function Set Point Shift 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 Reset Circuit Source Power CircuitOscillator Circuit TerminalDoor S/W Sensing Circuit Temperature Sensing CircuitMicom ChangeKey Scan and display operation DEF-sensor and Bimetal work in parallelKey Scan and Display Circuit Key Scan CoolSelect ZoneTM Panel Circuit Voltages between high-speed and low-speed Fan Motor Bldc Drive CircuitMotor drive circuit Option Circuit Eeprom CircuitLoad Drive Circuit D602COMP. equivalence circuit of drive section If power is not on DiagnosticsStart NormalIf the compressor and cooling fan motor don’t work normally AssemblyCheck after a lapse of 5 min ConnectionPerform forced defrosting for F Room at a time If defrost functionExchange and troubleshoot Corresponding sensor If there is a trouble with self-diagnosis If the temperature sensor of F and R room has troubleIf the ambient sensor has trouble Start Check if the iced solder of main PCB is ShortIf Ding-Dong sounds continuously Start If alarm soundIf Beep sounds continuously Start Remove causes afterDisplay’ Without sound of buzzer operation StartMain PCB is normal buzzer normal ZoneTM panel If the panel PCB is not working normallyConnections of door S/W If fan doesn’t work ReferenceDoor open DC Door closeIf the lamp of CoolSelect ZoneTM is not lit Start If CoolSelect ZoneTM isn’t operated normally RS2555, RS2577If the Panel PCB key isn’t selected Panel PCB has trouble for itselfIs 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 0V Stop Condition Appendix ⅠReference for circuit diagnosticsResistance value ∼DC 12V load working conditionValue Contents For safety, you must turn the power off LoadRef Check a load Ref. Def heaterLamp Lamp on the REF Ref Check Door S/W834 878791 749Part Name Specifcation ’TY Ref Service part lists of each circuit boardPage Page Refrigerator Division 2003 Code DA82-00001D Electronics