IC75 Input IC75 Output FAN, #18 GND0.8V, 107 | Samsung RM255BASB

CIRCUIT DESCRIPTIONS

1)As shown in the Figure, C/F, C/R FAN are connected to the CN75 connector, and FAN MOTOR consists of ND, VCC, FG.

2)If you intend to operate the C/F-FAN or C/R-FAN according to a certain condition in the MAIN PCB, which controls the refrigerator, follow the instructions below.

3)For example, to operate C/F-FAN, a 5V voltage comes out of MICOM #6 first. Then, the 5V voltage is input to IC75 #1 PIN, and the #18 PIN has a changed electric potential from OV to GND.

4)12V is connected to CN76 , and input to C/F-FAN Vcc. FAN MOTOR GND is connected to IC75 #18 PIN

through CN76 .

5) Thus, with the IC75 #18 PIN changed to GND by the signal from MICOM#6 PIN, the

FAN MOTOR will be operated in the order 12V CN76 C/F -FAN Vcc C/F-FAN GND CN76 IC75 #18 PIN GND.

6) Here, with normal operation of the FAN MOTOR, a square wave is generated in MOTOR FG, and this wave is

input as follows, MOTOR FG CN76

R413 MICOM #8.

7)Using this FG signal, it can be determined whether the FAN MOTOR is operating normally, and in case of FG signal errors, FAN motor errors are detected to use as refrigerator error data.

8)When the MICOM #6 signal changes to 0V again, IC75 # 1 PIN is OFF, and IC75 #18 PIN is OFF. Thus, current cannot flow, and the FAN MOTOR will stop..

			MICOM STATUS	IC75 INPUT	IC75 OUTPUT

	C/F-FAN	ON	#6 5V	#1 5V	#18 GND(0.8V)

		OFF	#6 0V	#1 0V	#18 11~12V
		OFF	#6 0V	#1 0V	#18 11~12V

	C/R-FAN	ON	#4 5V	#4 5V	#15 GND(0.8V)

		OFF	#4 0V	#4 0V	#15 11~12V
		OFF	#4 0V	#4 0V	#15 11~12V

The principle of operation is equally applied to the C/F and C/R FAN, and the BOX FAN uses the same specification.

BOX FAN SPEC

12V / 0.2A

107

79

Image 80

Samsung RM255BASB, RM255BABB manual IC75 Input IC75 Output FAN, #18 GND0.8V, 107

Contents

RM255BARB RM255BASB RM255BABB Authorized Training Center Campuses Important Safety Notice Contents Precautionssafety Warnings Symbols Forbidden Product Specifications This operation instruction covers various models Manual After packing 386lbs Model SpecificationRM25 Electric Parts Specification Sensor Specifications Model Dispenser Home Bar Electric ComponentsItems Running Part Code Optional Material SpecificationsPhotograph Operating Instructions & Installation Temperature Control Operation Digital Panel Power Freeze and Power cool Operation Power Freeze OperationPower cool Operation By in inside function irrespective of current setting At Initial Power On Lock FunctionAble to operate on front panel Cube / Crushed / ICE OFF Selection Function Machine Room F-Fan Motor Delay Function Water Dispenser FunctionLight Operation Load Operation Condition Initial Operation Reverse rotation CCW Forward rotation CW Ice extractionHorizontal position Interval about 880ms Maximum torsion point Water Supply Function Ice-Making FunctionIce Extraction Function Water Supply Time Bold numerals indicate relevant ice tray steps Horizontality operation Defrosting Function Defrosting period is fixed to 8 hoursArctic Zone 53.6 62.6 Arctic Select Zone Function FunctionOperation Fresh Select Zone Function Function Operation Specification Temp .8 ~ 44.6 of the Fridge compartmentTest KEY Operation start Forced Defrosting Function For the R compartment Alarm Function Communication Error Display FunctionWhen water supply is finished, in the ice maker test mode Display Function at Panel Operating Instructions & Installation Self-Diagnostics Function Self-Diagnostics Checklist BAD Item Trouble Status Error DefrostingSensor of R CR Sensor CF-FAN Error CR-FAN ErrorOn Error Trouble Relevant displays about load status is as follows Load Mode Checklist Load Item Load StatusLoad Condition Display Function Changing to Optional Mode Option Setting Function KEY Function Value Item Temperature Change Table for the Freezer Compartment Change for freezer compartment Temperature Change Table for the Refrigerator Compartment KEY CR Room Temperature Shift Function Case of basic model, the following items cannot be setMaker For Ice Maker Flow sensor Disassembly and Reassembly Removing the Front Leg Cover Door Assy Removing 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 Zone Close 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 Gasket Refrigerator Door Light Switch Refrigerator LightTempered Glass Shelf Plastic Drawers in the Refrigerator Freezer Door Light Switch Freezer CompartmentsDoor Bin in Freezer Plastic Drawer in Freezer Freezer Light Ice Dispenser Ice MakerTighten the screws 2 of the ice maker support Auger Motor Case Upper Ductwork Partition in the Freezer Screws Pull the upper part of the evaporator cover slightly Evaporator Fan Motor Evaporator in Freezer Freezer Thermistor Thermistor cover ScrewIce-Maker Thermistor Water Tank Evaporator cover in the Refrigerator Evaporator Fan Motor in Refrigerator Evaporator in Fridge Refrigerator ThermistorDuctwork Thermistor Thermistor cover Fresh /Arctic Select ZoneTM Thermistor Upper Ductwork Machine Compartment Electric Box PCB-MAIN AssySub-condenser Water Solenoids Removing the Arctic Select Zone Accessories If power is not on StartNormal Check at the Smps PBA Check Main PCB connection If 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 time If 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 & breaks Alarm Sounds continuouslyrelated to the buzzer If Ding-Dong sounds continuously StartIf Beep sounds continuously Start Gasket, food etc If the buzzer doesn’t sound Main PCB is normal, buzzer is NormalBuzzer is broken - replace it Replace buzzer or panel PCB It 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 Condition These signals will be inputted into Micom Door Open DC If 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/W If 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 itself Wiring Diagram Connector Arrangement Main Board Circuitschematic Diagram Conn Ector Arrangement SMP S Board Power BUS A voltage proportional to 98.9 93.7 40.0 88.9 38.2 84.2 36.4 79.8 34.6 75.7 32.8 71.868.2 64.7 107 IC75 Input IC75 Output FAN#18 GND0.8V Motor Drive Circuit Descriptions Principle of OperationComparison in HIGH/LOW Speed Remarks XAA 13-2 Q & a Problem Possible Causes What To Do Reference Information Problem Possible Causes What To Do Small or hollow cubes Suction Pipe Additional InformationCompressor Sub-condenser Hot Pipe Dryer Step valve Freezer Refrigerator