Samsung RB1844SL, Service Manual

Page 1: ...Model RB2044SL Bottom Mounted Freezer SAMSUNG Home Appliance Service ...

Page 2: ...e may result in personal injury and property damage The manufacturer or dealer cannot be responsible for the interpretation of this information SAMSUNG ELECTRONICS AMERICA INC Technical Service Guide Copyright ⓒ2004 All rights reserved This service guide may not be reproduced in whole or in part in any form without written permission from the SAMSUNG ELECTRONICS Company WARNING ...

Page 3: ...cations standard 5 5 Warranty information 7 6 Interior Views and Dimensions 8 7 Refrigeration Cycle and Cool Air Circulation Route 10 8 Mechanical Disassembly 12 9 Operation Function 19 10 Circuit Descriptions 26 11 Diagnostics 34 12 Safety instruction on services 48 Appendix I Ⅱ Circuit diagram 49 ...

Page 4: ...t in the factory for recommended settings The refrigerator should runs smoothly and lower the temperature gradually 4 Once the refrigerator temperature is sufficiently low It is recommended to store foods in the refrigerator It takes a few hours to reach the preset temperatures 2003 Models R B 20 44 SW XAA Product R REFRIGERATOR Capacity CU FT B BOTTOM MOUNTED FREEZER BMF OPTION 44 NO DISPENSER CO...

Page 5: ...th screw Door switch Model Starting type Refrigerant Oil Charge Freezer Refrigerator Evaporator Compressor RB1844SW RB1844SL RB2044SW RB2044SL BMF 2 Door Electronic control CYCLO PENTANE CYCLO PENTANE A B S A B S 227 227 241 241 32 3 X 28 3 X 69 9 32 3 X 30 3 X 69 9 Model Type Temperature control Total Freezer Refrigerator Net Capacity ft 3 Cabinet insulation Door insulation Cabinet Door Liner Foa...

Page 6: ...se First Defrost Cycle Concurrent Defrost of F and R Defrost Cycle FRE Defrost Cycle REF Pause Time Freezer Sensor Refrigerator Sensor FRE Evap Sensor REF Evap Sensor Ambient TEMP Sensor Defrost Heater FRE Drain Heater FRE Defrost Heater REF Drain Heater REF Temperature Electrical parts 242W 52W 120W 38W AC250V 10A 77 5 C Thermal Fuse for preventing overheating of Freezer Defrost Heater Thermal Fu...

Page 7: ...7 5 WARRANTY INFORMATION ...

Page 8: ...semble Door Bin Push it up and slide it out to disassemble Glass Shelf Pull it out until its stop Tilt down and slide it out Ice trays Vegetable Drawer Gallon Bin Light Freezer Drawer 6 Interior Views and Dimensions 6 1 Shelves and Bins ...

Page 9: ...9 Interior Views and Dimensions MODEL RB1844 RB2044 A 24 3 26 3 B 28 3 30 3 C 57 8 59 8 6 2 Dimensions of Refrigerator Inches ...

Page 10: ...tion Cycle and Cool Air Circulation Route Compressor Sub condenser Cluster pipe Hot pipe Dryer Capillary tube R Evaporator F Evaporator Accumulator Suction pipe Compressor 7 1 Refrigerant Route in Refrigeration cycle ...

Page 11: ...11 Refrigeration Cycle and Cool Air Circulation Route 7 2 Cool Air Circulation ...

Page 12: ... Disassembly Control Panel 13 Refrigerator Light 14 Freezer Light 14 Evaporator Cover in the Refrigerator 15 Evaporator Cover in the Freezer 16 Evaporator in the Freezer 17 Evaporator in the Refrigerator 17 Machine Compartment Electric Box 18 ...

Page 13: ...13 Mechanical Disassembly 1 Remove the screws 2 Pull out the control panel 3 Disconnect the wire connector Control Panel ...

Page 14: ...cover and the screw it again 5 Plug the power cord in and check the lamp by pressing the R door switch Always unplug the power cord before replacing the refrigerator lamp There is the danger of electric shock 1 Remove the cover by pressing the bottom tab 2 Replace the lightbulb by turning it counter clock wise 3 Reattach the cover and check the lamp by pressing door switch Warning Refrigerator Lig...

Page 15: ...e screwdriver 3 Remove 6 Phillps screws from the cover 4 Unlock the 2 tabs with a flat blade screwdriver on each side of the bottom cover 5 Remove the evaporator cover by pulling out from the bottom of the evaporator cover Evaporator Cover in the Refrigerator 6 Disconnect the wire connector Ductwork of the evaporator fan assembly ...

Page 16: ...ly 1 Remove all drawers from the freezer 2 Remove screws 2 from the support rail 3 Pull down the holder of the support rail and disconnect the wire connector to remove it 4 Unlock the tabs around the evaporator cover from the buttom 5 Disconnect wire connector from the top left corner 2 screws Evaporator Cover in Freezer ...

Page 17: ...in the bottom of refrigerator 1 Take off the ductwork in refrigerator 2 Disconnect the wire connector Heater and Thermistor 3 Desolder the capillary tube and the suction line from the evaporator 4 Remove the evaporator 5 With a file score the capillary tube just upstream of the soldered point Break off the soldered section to help prevent solder from plugging the tube during soldering 6 Place a ne...

Page 18: ...ng any electric components Mechanical Disassembly 2 Remove the screws of the compartment cover Slide it up and take out from the refrigerator 3 Mechine compartment assembly Machine Compartment Electric Box Warning 4 Disassemble the electric box cover after removing the screws with a Phillips screwdriver ...

Page 19: ...Freeze and Power cool Functions 20 9 4 Sound Function 21 9 5 Defrost Function 21 9 6 Forced Operation Function 22 9 7 Power failure compensating Function 23 9 8 Exhibition Function 23 9 9 Self Diagnostics Function 23 9 10 Component Load Operation Function 24 9 11 C Fan Motor Delay function 25 ...

Page 20: ...ons memorized in EEPROM will be restored when the power is on Select the Power Freeze or Power Cool buttons separately These buttons are toggled ON and OFF and the indicators as well Although you select Power Freeze or Power Cool the set temperatures in the freezer and refrigerator are not changed The set temperatures for the compartments can be changed while these functions are in use 1 Power Fre...

Page 21: ...cted there is no benefit of fast cooling for each compartment 9 4 Sound Function 1 A defrost is determined based on the accumulated compressor on time 2 When the power is engaged for the first time the defrost cycle for the freezer and the refrigerator will begin after 4 hours of the accumulated compressor on time 3 A defrost interval depends on the ambient temperature the number of door openings ...

Page 22: ...note If this pull down mode begins right after the compressor was off the compressor may not start to run due to an overload condition 1 3 At this mode the compressor and freezer fan will operate continuously for 24 hours and the refrigerator fan will be on and off according to the set temperature 34 1 4 After 24 hour operation the system will be cycled at 14 for the freezer and 34 for the refrige...

Page 23: ... is no defrost cycle in this mode 9 8 Exhibition Function 1 Self Diagnostics in the initial Power ON 1 1 The control board performs a self diagnostics test within 1 second and check out the temperature sensors abilities 1 2 If a sensor failure occurs a corresponding LED segment will blink 1 3 When a LED segment blinks only the cancellation function Press Power Freeze and Power Cool buttons simulta...

Page 24: ... to be below 58 Suspected to be over 150 Remarks F defroster sensor F sensor Outer sensor R defroster sensor R sensor Item FREEZER FREEZER FREEZER REFRIGERATOR REFRIGERATOR LED Display Table 1 Display table of self diagnosis 1 In the normal operation press Power Freeze and Power Cool buttons simultaneously for 3 second then the display panel will blink for 2 seconds 2 Press Refrigerator Temp butto...

Page 25: ...EEZER 1digit REFRIGERATOR 10digit REFRIGERATOR 1digit Content a REFRIGERATOR 1 digit c REFRIGERATOR 1 digit d REFRIGERATOR 1 digit e REFRIGERATOR 1 digit f REFRIGERATOR 1 digit g REFRIGERATOR 1 digit a FREEZER 1 digit b FREEZER 1 digit d FREEZER 1 digit a FREEZER 10 digit b FREEZER 10 digit Display LED Table 2 Display table of the presently operating parts l According to the ambient temperature th...

Page 26: ... 1 Source Power Circuit 27 10 2 Oscillator Circuit 27 10 3 Reset Circuit 28 10 4 Door S W Sensing Circuit 28 10 5 Temperature Sensing Circuit 29 10 6 Key Scan and Display Circuit 30 10 7 Load Drive Circuit 31 10 8 Option Circuit 32 ...

Page 27: ...oltage drops to AC 15 volts on the transformer secondary side between at CN 10 The rectified voltage passed through D105 D108 becomes DC 12V through voltage regulator MC7812CT REG2 This DC12V is supplied to the relay operation and LED display It is designed for clock generation and time calculation for synchronizing transmission and reception on the logic elements inside the MICOM If the X TAL spe...

Page 28: ... Voltage DC 5V DC 5V 1 If a door is open the door S W contact is closed Then MICOM receives low signal and detects door open A relay control circuit receives HIGH signal and turn Lamp on 2 If a door is closed the door S W contact is open Then MICOM receives high signal and detects door close A relay control circuit receives LOW signal and turn Lamp off DOOR F R Door Conditions CLOSE OPEN CLOSE OPE...

Page 29: ...ance goes higher 2 A MICOM input voltage is calculated by sensor as follows VCC 5V RTH Sensor reisitance 3 For the resistance data corresponding to a temperature and a MICOM input voltage please refer the conversion table on the back RTH VF X Vcc RTH R301 When Sensor is open MICOM input HIGH When sensor is cut off MICOM input LOW Air Sensor 10 5 Temperature Sensing Circuit ...

Page 30: ...If the IC04 decorder KID65783AD receives signals from MLCOM pins 34 6 an output signal per 2 miliseconds comes out from Grid 1 7 A step DC12 volt peak will be generated periodically as follows 10 6 Key Scan and Display Circuit ...

Page 31: ... MICOM outputs LOW 0V the compressor will stop 3 If the RY71 is connected to NC RY72 and 73 for defrost heaters will be on and corresponding heater Will be activated according to the signal from MICOM Like the above block diagram operation of F R defrost heater is determined by the operation of the relay for COMP RELAY Load Comp Operation Comp off Defrost Heater Off Defrost Heater On Comp Off Defr...

Page 32: ...ft Unit F SHIFT Reference 1 0 2 0 4 0 6 0 2 0 4 0 6 0 D604 D605 D606 Temperature and function values can be abjustable by using main PCB switching diode Note the values have been preset in factory If is recommended not to change the value arbitrarily When the option function is modified a power should be turned off and on again 10 8 Option Circuit ...

Page 33: ...33 Circuit Descriptions ...

Page 34: ...ot ON At the power of main PCB the 115V power and a high voltage over DC 170V occur Special care should be advised on repair and measurement To check the main PCB please apply descriptions of operation and references in the manual Caution ...

Page 35: ...35 Diagnostics 1 If the ambient sensor has trouble 2 If the temperature sensor of the refrigerator has trouble 11 2 If there is a trouble with self diagnosis ...

Page 36: ...36 Diagnostics 3 If the defrost sensor of the refrigerator has trouble 4 If the temperature sensor of the freezer has trouble ...

Page 37: ...37 Diagnostics 5 If the defrost sensor of the freezer has trouble ...

Page 38: ...nutes after compressor is OFF 2 A compressor does not run during defrost period 3 A compressor does not run because a low temperature is detected if freezer and the refrigerator sensor are not connected Pre check 11 3 If the compressor is not working properly ...

Page 39: ...n OFF 2 When COMP is ON the refrigerator fan is not always ON and when the refrigerator temperature reached a set temperature the fan goes OFF 3 When both the freezer and the refrigerator doors are closed each fan has a delay time 5sec 1 min and then degins to run COMP ON condition Pre check 4 1 When freezer fan F fan do not operate 11 4 If cooling fan doesn t work ...

Page 40: ...40 Diagnostics 11 5 If the refrigerator fan doesn t work ...

Page 41: ...41 Diagnostics 11 6 If the compressor cooling fan motor doesn t work ...

Page 42: ...tics function 2 When the temperature fuse is open there is no heating and a defrost occurs naturally by the compartment temperature increase and eventually it will cause a blinking of temperature 3 When both F R defrost sensors are open heating does not end The compressor remains off and a temperature fuse will be open Refer to self diagnostics function Pre check ...

Page 43: ...43 Diagnostics ...

Page 44: ... 2 minutes when the door is open and runs in every 2 minutes 2 If the door is not closed properly MICOM will indicate that the door is open and alarm continues If the alam goes for 10 minutes the light in the compartment will be off and not be on in the situation that the door opens Pre check ...

Page 45: ...45 Diagnostics 2 If beep sounds continuously 3 When the digital panel PCB does not light ...

Page 46: ...46 Diagnostics 4 When a button of the digital panel is not selected ...

Page 47: ...Diagnostics 5 If the lamp of refrigerator fails to light 1 Is the power cord connected to a wall outlet correctly 2 Be careful of high voltage high frequency discharge from the electronic ballast Pre check ...

Page 48: ...t be the same assembled state as before Check the surrounding conditions of the installed refrigerator When the refrigerator is located at humid or wet place or the installed state is unstable change the location If needed do the ground Especially if there is a possibility of the electric leakage this appliance must be properly grounded Do not allow consumers to use one outlet for several plugs Ch...

Page 49: ...49 11 PCB Circuit Diagram ...