Samsung RM255BASB If fan motor doesn’t working normaly, Door S/W, Door Open 0V DC, Condition

Page 68

DIAGNOSTIC

6-7) If fan motor doesn’t working normaly.

This refrigerator uses a BLDC FAN motor and this motor is driven by 8 ~12V DC.

Under the normal condition of COMP ON, it is operated together with F-FAN motor. F-Fan motor may not work depending on the conditions. If the door is opened and closed once at a high ambient temperature, the BLDC motor would be operated after 1 minute or delayed longer. Therefore, you are advised not to take it for an error.

Start

FOR C-FAN

Is the voltage 8- 12V DC between

main-PCB GND section and CN74 pin No. 4?

NO

FOR R-FAN

Is the voltage 8V-12V DC between

main-PCB GND and pin No. 5 of CN74 ?

NO

Is the voltage 5V DC between CN30 No. 8 and No. 14 in the main-PCB?

YES

NO

Is the COMP OFF State?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Execute Forced

FOR F-FAN

YES

 

 

 

 

operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the voltage 8V-12V DC between

YES

 

 

 

 

main-PCB GND and pin No. 6 of CN74 ?

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

Fan works normally.

 

 

 

 

 

 

 

 

 

Is the voltage 5V DC between

NO

 

 

 

 

 

 

CN30 No. 1 and No. 7 in the main- PCB?

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

Troubleshoot the connections

of the door S/W.

FOR C-FAN

Does 7-12V DC alternate with lass than

2V DC between main-PCB GND

and CN74 pin NO.4?

YES

Reference

 

 

 

 

 

 

Apply power around 5 minutes

 

 

 

 

Measure with the door closed.

 

 

 

 

In the first power application, the

 

- Door Open: 0V DC

 

 

after power OFF.

 

 

freezer / refrigerator / compressor

 

- Door Close : 5V DC

 

 

(to prevent compressor overload.)

 

 

fans work for 5 minutes regardless

 

 

 

 

 

 

 

 

 

 

 

of the condition.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FOR R-FAN

 

 

FOR F-FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Does 7-12V DC alternate with lass than

Does 7-12V DC alternate with lass than

NO

2V DC between main-PCB GND

2V DC between main-PCB GND

 

nd CN74 pin NO.5?

nd CN74 pin NO.6?

 

YES

YES

Exchange or troubleshoot

 

 

the main PCB.

CN74 pin #3(F-FAN), pin #2(R-FAN), and pin #1(C-FAN) will get pulse signals generated as motor rotates. These signals will be input into MICOM. If signals are not input into the motor operation, it will re-operate 10 seconds after the fan OFF. But if signals are not still input, the above operation will be performed four more times. If signals keep failing to be input, the motor will be started again after 10 minutes. This function is effective to secure the normal operation where the motor would be restrained due to foreign matters such as ice.

Expected causes :

1.Fan motor itself has a failure.

2.Wire connections have a contact problem.

3.Check : Input of the fan motor rotation pulse for fan motor operation. (See the details in Fan Motor Drive Circuit section.)

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Contents RM255BARB RM255BASB RM255BABB Authorized Training Center Campuses Important Safety Notice Contents Precautionssafety Warnings Symbols Forbidden Product Specifications This operation instruction covers various models ManualAfter packing 386lbs Model SpecificationRM25 Electric Parts Specification SensorSpecifications Model Dispenser Home Bar Electric ComponentsItems RunningPart Code Optional Material SpecificationsPhotograph Operating Instructions & Installation Temperature Control Operation Digital PanelPower Freeze and Power cool Operation Power Freeze OperationPower cool Operation By in inside function irrespective of current settingAt Initial Power On Lock FunctionAble to operate on front panel Cube / Crushed / ICE OFF Selection FunctionMachine Room F-Fan Motor Delay Function Water Dispenser FunctionLight Operation Load Operation ConditionInitial Operation Reverse rotation CCW Forward rotation CW Ice extractionHorizontal position Interval about 880ms Maximum torsion pointWater Supply Function Ice-Making FunctionIce Extraction Function Water Supply TimeBold numerals indicate relevant ice tray steps Horizontality operation Defrosting Function Defrosting period is fixed to 8 hoursArctic Zone 53.6 62.6Arctic Select Zone Function FunctionOperation Fresh Select Zone FunctionFunction Operation Specification Temp .8 ~ 44.6 of the Fridge compartmentTest KEY Operation startForced Defrosting Function For the R compartmentAlarm Function Communication Error Display FunctionWhen water supply is finished, in the ice maker test mode Display Function at PanelOperating Instructions & Installation Self-Diagnostics FunctionSelf-Diagnostics Checklist BAD Item Trouble StatusError DefrostingSensor of R CR SensorCF-FAN Error CR-FAN ErrorOn Error TroubleRelevant displays about load status is as follows Load Mode Checklist Load Item Load StatusLoad Condition Display Function Changing to Optional Mode Option Setting FunctionKEY Function Value ItemTemperature Change Table for the Freezer Compartment Change for freezer compartmentTemperature Change Table for the Refrigerator Compartment KEYCR Room Temperature Shift Function Case of basic model, the following items cannot be setMaker For Ice Maker Flow sensorDisassembly and Reassembly Removing the Front Leg Cover Door AssyRemoving the Freezer Door Removing the Refrigerator Door Liner on the right side of the rail To separate it Open the Fresh Select Zone DoorRemove two screws holding it to Reattaching the Freezer Door Reattaching the Refrigerator Door Levelling Open the Arctic Select Zone Door ZoneClose the filter cartridge cover Do not overtighten the compression Note nutWater line must be connected to drinkable water only Door Sub Parts Control PanelDoor Handle Door GasketRefrigerator Door Light Switch Refrigerator LightTempered Glass Shelf Plastic Drawers in the RefrigeratorFreezer Door Light Switch Freezer CompartmentsDoor Bin in Freezer Plastic Drawer in FreezerFreezer Light Ice Dispenser Ice MakerTighten the screws 2 of the ice maker support Auger Motor Case Upper DuctworkPartition in the Freezer Screws Pull the upper part of the evaporator cover slightlyEvaporator Fan Motor Evaporator in FreezerFreezer Thermistor Thermistor cover ScrewIce-Maker Thermistor Water TankEvaporator cover in the Refrigerator Evaporator Fan Motor in RefrigeratorEvaporator in Fridge Refrigerator ThermistorDuctwork Thermistor Thermistor cover Fresh /Arctic Select ZoneTM ThermistorUpper Ductwork Machine Compartment Electric Box PCB-MAIN AssySub-condenser Water SolenoidsRemoving the Arctic Select Zone Accessories If power is not on StartNormal Check at the Smps PBA Check Main PCB connectionIf the compressor doesn’t work normally Check connector for Contact failureExchange and repair COMP. Assembly Reference Perform forced defrosting for F R room one at a timeIf the ambient temperature sensor has trouble How To Check Temperature Sensing in the manualIf there is a trouble with self-diagnosissensor failure Check the soldering on the main PCB for Shorts & breaksAlarm Sounds continuouslyrelated to the buzzer If Ding-Dong sounds continuously StartIf Beep sounds continuously Start Gasket, food etcIf the buzzer doesn’t sound Main PCB is normal, buzzer is NormalBuzzer is broken - replace it Replace buzzer or panel PCBIt is a care Where the Panel PCB key isn’t selectedIf the panel PCB is not working normally If fan motor doesn’t working normaly Door S/WDoor Open 0V DC ConditionThese signals will be inputted into Micom Door Open DCIf Ice Cubed or/and Ice Crushed dont work normally If Indoor Lamp of Freezer/Refrigerator doesn’t light Replace Inside lamp Replace or troubleshoot Door S/WIf Water Drawer doesnt work normally Preliminary Check Replace connector Wire and switch Replace connector and wireIf Dispenser LED Lamp doesnt light Failure of panel PCB itselfWiring Diagram Connector Arrangement Main Board Circuitschematic Diagram Conn Ector Arrangement SMP S Board Power BUS A voltage proportional to98.9 93.7 40.0 88.9 38.2 84.2 36.4 79.8 34.6 75.7 32.8 71.868.2 64.7107 IC75 Input IC75 Output FAN#18 GND0.8V Motor Drive Circuit Descriptions Principle of OperationComparison in HIGH/LOW Speed RemarksXAA 13-2 Q & a Problem Possible Causes What To Do Reference InformationProblem Possible Causes What To Do Small or hollow cubesSuction Pipe Additional InformationCompressor Sub-condenser Hot Pipe Dryer Step valve Freezer Refrigerator
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