SAMSUNG Home Appliance Service Bottom-Mounted Freezer Model: RB1955SW RB1955SH RB1955VQ RB2155SW RB2155SH RB2155BB SAM0052
WARNING IMPORTANT SAFETY NOTICE The service guide is for service men with adequate backgrounds of electrical, electronic, and mechanical experience. Any attempt to repair a major appliance 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.
Contents 1. Installation ······································ 2. Nomenclature 4 ····································4 3. Product Specifications ·······························5 4. Electrical part specifications & standard 5. Warranty information ·····················5 ································7 6. Interior Views and Dimensions ···························8 7. Refrigeration Cycle and Cool Air Circulation Route···············10 8. Mechanical Disassembly······························12 9.
1. INSTALLATION 1) To protect refrigerator in movement Use padded hand truck from side only. 2) Remove all protective tape and pad from the refrigerators. Connect power cord. Adjust the clearance between the doors. 3) Temperature controls ard preset 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.
3. PRODUCT SPECIFICATIONS Model RB1955SW/SH/VQ RB2155SW/SH/BB Type BMF 2 Door Temperature control Electronic control Total 18.7 20.4 Freezer 5.9 6.5 Refrigerator 12.8 13.9 32.3 X 28.3 X 69.9 32.3 X 30.3 X 69.9 Net Capacity 3 (ft ) Net dimension (W X D X H) Foam Cabinet insulation CYCLO-PENTANE Door insulation CYCLO-PENTANE Cabinet A.B.S Door A.B.S Liner 227 Net weight(Ib) 241 4.
ELECTRICAL PART SPECIFICATIONS & STANDARD ITEM STANDARD Temperature Type Freezer F-Sensor Type Refrigerator R-Sensor Temperature Selection ON(℉) OFF(℉) –14℉ –12.0℉ –16.0℉ –2℉ 0℉ –4℉ 8℉ 10℉ 6℉ Temperature Selection ON(℉) OFF(℉) 34℉ 36℉ 32℉ 40℉ 42℉ 38℉ 46℉ 48℉ 44℉ First Defrost Cycle 4hr ±10min (Concurrent Defrost of F and R) Defrosting Defrost Cycle(FRE) Min. 12hrs, Max. 22Hrs Defrost Cycle(REF) Min. 6hrs, Max.
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6. Interior Views and Dimensions 6-1) Shelves and Bins • Deli drawer • Door Bin Pull it out to disassemble. Push it up and slide it out to disassemble. Light • • • • Gallon Bin • Glass Shelf • Pull it out until its stop Tilt down and slide it out.
Interior Views and Dimensions 6-2) Dimensions of Refrigerator (Inches) MODEL A B C RB1955 RB2155 24.3 28.3 57.8 26.3 30.3 59.
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Refrigeration Cycle and Cool Air Circulation Route 7-2) Cool Air Circulation 11
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Mechanical Disassembly Control Panel 1. Remove the screws. 2. Pull out the control panel. 3. Disconnect the wire connector.
Mechanical Disassembly Warning Always unplug the power cord before replacing the refrigerator lamp. There is the danger of electric shock. Refrigerator Light Freezer Light 1. Remove the screw. 1. Remove the cover by pressing the bottom tab. 2. Remove the lamp cover by unlocking the tabs and pulling the cover down. 2. Replace the lightbulb by turning it counter-clock wise. 3. Replace the lightbulb by turning it counterclockwise. 3. Reattach the cover and check the lamp by pressing door switch. 4.
Mechanical Disassembly Evaporator Cover in the Refrigerator 6. Disconnect the wire connector. 1. Remove all shelves and drawers from the refrigerator. 2. Pull out the screw caps with a small flat-blade screwdriver. 3. Remove 6 Phillps screws from the cover. ■Ductwork of the evaporator fan assembly. 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.
Mechanical Disassembly Evaporator Cover in Freezer 5. Disconnect wire connector from the top-left corner. 1. Remove all drawers from the freezer. 2. Remove screws (2) from the support rail. 6. Remove 2 screws from the rear cover of the freezer evaporator and unlock the tabs to remove it. 2 screws 3. Pull down the holder of the support rail and disconnect the wire connector to remove it. ① ② 4. Unlock the tabs around the evaporator cover from the buttom.
Mechanical Disassembly Evaporator in Refrigerator Evaporator in Freezer Evaporator is located 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.
Mechanical Disassembly Machine Compartment ＆ Electric Box 3. Mechine compartment assembly Make sure the power cord is unplugged before replacing any Warning electric components. 1. Unplug the power cord. 4. Disassemble the electric box cover after removing the screws with a Phillips screwdriver. 2. Remove the screws of the compartment cover. Slide it up and take out from the refrigerator. 5.
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Operation Function 9-1) Digital Panel 9-2) Temperature Control Function When the system power is initally engaged, the default set temperature are -2℉ for the freezer and 38℉ for the set refrigerator, respectively. The numbers shown on the digital display panel stand for the actual compartments temperatures. When the compartment temperatures go down, so do the numbers on the display panel, and finally they reach the set temperatures.
Operation Function 3) When you select Power Freeze and Power Cool together Each function works at the same time. The COMP and F-FAN run continuously and the R-FAN runs until 25℉ in the refrigerator. 4) Initial Power-On 4-1) When the freezer and the refrigerator temperatures are higher than 14℉ and 50℉, respectively, if Power Freeze is selected, then the R-FAN will be off. If Power Cool is selected, then the F-FAN will be off.
Operation Function 9-6) Forced Operation function (Power cool key + Refrigerator. Temp 8sec.) This function enables a pull-down mode, a defrost mode for the refrigerator only, a defrost mode rigerator at the same time, and a cancellation of this function. ● Press Power Cool and Refrigerator Temp. buttons for 8 seconds simultameously to get in the ready mode for a forced operation. ● The display panel will return to normal after 15 seconds in the ready mode.
Operation Function 9-7) Power failure compensating function 1) When the freezer temperature is lower than 50℉, all functions on the display panel will be restored. 2) When the freezer temperature is higher than 50℉, all functions will be initialized. (2℉ for the freezer, 38℉ for the refrigerator, and Cubed for the Ice Type) 9-8) Exhibition Function l This function is for a display purpose on the floor of show room or store. 1) Mode ON/OFF 1-1) For the exhibition mode, press Power Freeze and Freezer Temp.
Operation Function Table 1. Display table of self diagnosis.
Operation Function FREEZER:10digit FREEZER: 1digit REFRIGERATOR:10digit REFRIGERATOR: 1digit Table 2. Display table of the presently operating parts. No Content 1 2 3 4 5 6 7 8 9 10 11 R-fan R-defrost heater Initial start mode Over load mode Low temp.
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Circuit Descriptions 10-1) Source Power Circuit Circuit used Voltage (DC 12V) Relay Operation & LED Display Vcc (DC 5V) Power around MICOM & Sensor Detector 1) The input AC voltage drops to AC 8 volts on the transformer secondary side between ①~③ at CN 10. The rectified voltage passed through D101 ~ 104 becomes DC 5V through voltage regulator MC7805(REG1). This (DC5V) is supplied to the control board and sensor’s circuits.
Circuit Descriptions 10-3)Reset Circuit Port Voltage Vcc DC 5V Reset DC 5V When the power is supplied to MICOM, the reset circuit initializes RAM and other sectors of MICOM. A reset voltage maintains “low” for hundreds of µsec comparing to MICOM Vcc voltage when the power is in. It also maintains “high”(5V) during normal operation. But, when Vcc drops to 3.4V-3.7V, a reset port becomes “low”.
Circuit Descriptions 10-5) Temperature Sensing Circuit ( Air Sensor) When Sensor is open When sensor is cut off MICOM input “HIGH” MICOM input “LOW” 1) The sensor uses the characteristics of thermistor. If temperature goes higher, resistance goes lower. On the contrary, if temperature goes lower, resistance goes higher. 2) A MICOM input voltage is calculated by sensor as follows.
Circuit Descriptions 10-6) Key Scan and Display Circuit If the IC04 decorder(KID65783AD) receives signals from MLCOM pins(34-6), an output signal per 2 miliseconds comes out from Grid#1-#7.
Circuit Descriptions 10-7) Load Drive Circuit 1) Most of relays can control the compressor, heaters and several option functions. 2) For the compressor, #12 pin of MICOM signals HIGH(5V). This signal enters to #2 of IC03 and #15 of output terminal will be on and grounded. When the rely RY71 is switched to NO terminal a 115V power is supplied to the compressor. If MICOM outputs LOW(0V), the compressor will stop.
Circuit Descriptions 10-8) Option Circuit 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. 1) Freezer Temperature Shift 2) Refrigerator Temperature Shift (Unit ˚F) (Unit ˚F) SHIFT D601 D602 D603 SHIFT D604 D605 D606 Reference - - - Reference - - - -1.0 - - • -1.
Circuit Descriptions 33
11. Diagnostics 11-1) If power is not ON Caution! At the power of main PCB, the 115V power and a highvoltage over DC 170V occur. Special care should be advised on repair and measurement. 34 To check the main PCB, please apply descriptions of operation and references in the manual.
Diagnostics 11-2) If there is a trouble with self-diagnosis 1) If the ambient sensor has trouble. 2) If the temperature sensor of the refrigerator has trouble.
Diagnostics 3) If the defrost sensor of the refrigerator has trouble. 4) If the temperature sensor of the freezer has trouble.
Diagnostics 5) If the defrost sensor of the freezer has trouble.
Diagnostics 11-3) If the compressor is not working properly Pre-check 1. A compressor does not operate within 5 minutes 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.
Diagnostics 11-4) If cooling fan doesn’t work Pre-check Select a pull-down mode from the forced operation function 1. When COMP is OFF both freezer and the refrigerator cooling fans and COMP cooling fan remain 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.
Diagnostics 11-5) If the refrigerator fan doesn’t work 40
Diagnostics 11-6) If the compressor cooling fan motor doesn’t work 41
Diagnostics 11-7) No defrosting Pre-check 1. Although both F R-defrost sensors have short-circuit, a normal operation continues without a defrost cycle (Refer to self - diagnostics 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.
Diagnostics 43
Diagnostics 11-8) Alarm continuously Pre-check 1. Alarm begins after 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.
Diagnostics 2) If beep sounds continuously 3) When the digital panel PCB does not light 45
Diagnostics 4) When a button of the digital panel is not selected 46
Diagnostics Pre-check 1. Is the power cord connected to a wall outlet correctly? 2. Be careful of high-voltage, high-frequency discharge from the electronic ballast.
13. Safety Instructions on Service ●Unplug the refrigerator before making any repair or any replacement. Avoid the electric shock. ●Use the rated components on the replacement. Check the correct model number, rated voltage, rated current, operating temperature and so on. ●On repair, be sure that the wires such as harness are bundled tightly and are not exposed by water. Bundle wires tightly in order not to be detached by the external force.
Appendix Ⅰ(Reference for circuit diagnostics) Ref.1) Wire connector on the cabinet door. Ref. 2) How to check relay failure * Disconnect the wire connector from the main PCB CN70, 71 and measure the following items. 1. Measure the coil bisection of the relay and check whether it works. 2. Measure the apex bisection for open circuit.
Ref. 3) Check a load * Unplug the power cord and disconnect the connector from the main PCB CN70, 71 and measure the following: 1. Measure resistance between the terminals and check for malfunctioning of a load and wire connection. Subordinate R Defrost heater F Defrost heater Comp Comp-circulation fan R-Circulation fan F-Circulation fan R-Lamp F-Lamp Measurement Evaluation of meaterminal surement result CN70 ⑤ - ① CN70 ⑦ - ① CN70 ⑨ - ① CN71 ⑦ - ① CN71 ⑤ - ① CN70 ③ - ① CN71 ⑨ - ① CN71 ③ - ① Ref.
Ref. 5) Check Door S/W (Refrigerator Bulb) 1. Open the door and check if the freezer lamp turns on. 2. Press the Door S/W and check if the freezer lamp turns off. 3. Close the freezer door and repeat 1 and 2 for refrigerator door. 4. If there is a problem, check lightbulb and door S/W. 5. Check wire connection. (Micom signal) 1. Check if CN30 ⑥ and ⑧ is 5V DC after closing the F·R doors. 2. Check if CN30 ⑥ is 0V DC when opening F door. Check if CN30 ⑧ is 0V DC when opening R door. 3.
Ref. 7) Table of temperature sensor according to resistance and voltage conversion. * Voltage conversion table depends on H/W structure of MICOM port input voltage. Sensor Short : Micom 0V. Sensor Open : Micom 5V. ※ Sensor partial pressure resistance 10KΩ ℉) Temp.(℉ Ω) Resistance(Ω Voltage(V) ℉) Temp.(℉ Ω) Resistance(Ω -43.6 98870 4.541 12.2 21410 3.408 -41.8 93700 4.518 14.0 20480 -40.0 88850 4.494 15.8 -38.2 84150 4.469 -36.4 79800 -34.6 Ω) Resistance(Ω Voltage(V) 68.
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- This Service Manual is a property of Samsung Electronics Co., Ltd. Any unauthorized use of Manual can be punished under applicable International and/or domestic law. - © Samsung Electronics Co., Ltd. Refrigerator Division 2004.
