LG Electronics GR-P257/L257, GR-P227/L227 Summary Of Heavy Repair, Process Contents Tools

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TROUBLE DIAGNOSIS

3-2. Summary Of Heavy Repair

Process

Contents

Tools

Trouble
diagnosis

Remove refrigerant	- Cut charging pipe ends and discharge refrigerant from			Filter, side cutters
Residuals		drier and compressor.
		drier and compressor.

	- Use R134a oil and refrigerant for compressor and drier			Pipe Cutter, Gas welder, N2 gas
Parts	- Confirm N2 sealing and packing conditions before use.
replacement		Use good one for welding and assembly.
and welding	- Weld under nitrogen gas atmosphere.(N2 gas pressure:
		0.1-0.2kg/cm2).
	- Repair in a clean and dry place.

	- Evacuate for more than forty minutes after connecting			Vacuum pump(R134a
		manifold gauge hose and vacuum pump to high (drier)		exclusively), Manifold gauge.
Vacuum		and low (compressor refrigerant discharging parts)
		pressure sides.
	- Evacuation Speed:113l/min.

Refrigerant	- Weigh and control the allowance of R134a bombe in a			R134a exclusive bombe(mass
Refrigerant
charging and		vacuum conditions to be ±5 g with electronic scales and		cylinder), refrigerant(R134a)
charging		charge through compressor inlet		manifold gauge, electronic
inlet welding		(Charge while refrigerator operates).		scales, punching off flier,
		(Charge while refrigerator operates).		scales, punching off flier,
	- Weld carefully after inlet pinching.			gas welding machine

	- Check leak at weld joints.			Electronic Leak Detector,
			Minute leak: Use electronic leak detector	Driver(Ruler).
			Minute leak: Use electronic leak detector	Driver(Ruler).
Check			Big leak: Check visually or fingers.
Check			Big leak: Check visually or fingers.
refrigerant leak	Note:Do not use soapy water for check.
and cooling	- Check cooling capacity
capacity	- Check cooling capacity
capacity	➀ Check radiator manually to see if warm.
	➀ Check radiator manually to see if warm.
	➁ Check hot line pipe manually to see if warm.
	➂ Check frost formation on the whole surface of the
		evaporator.

Compressor	- Remove flux from the silver weld joints with soft brush			Copper brush, Rag, Tool box
Compressor	or wet rag.(Flux may be the cause of corrosion and
compartment	or wet rag.(Flux may be the cause of corrosion and
and tools	leaks.)
arrangement	- Clean R134a exclusive tools and store them in a clean
	- Clean R134a exclusive tools and store them in a clean
		tool box or in their place.

Transportation	- Installation should be conducted in accordance with the
Transportation	standard installation procedure.(Leave space of more
and	standard installation procedure.(Leave space of more
installation	than 5 cm from the wall for compressor compartment
	cooling fan mounted model.)

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Contents Refrigerator Contents Page Front View SpecificationsRef No. GR-L227 Ref No. GR-P257 Ref No. GR-L257 Freezer Refrigerator compartment compartment Parts IdentificationRef No. GR-P227/GR-P257EXTERNAL Filter Parts Identification Parts Identification How to Adjust Door Height of Refrigerator HOW to Install RefrigeratorHow to Install Water Pipe Before InstallationClass Shape and Spec Nomenclature General Type Connection of Pipe Connector a and BSingle Lever Type Faucet general Two Hands Type FaucetWhen customer uses bottled water Filter CleaningOutternal Filter Filter Fixation Replacement of water filter After installing water filterConfirm the amount of water supplied to the icemaker How to Control the Amount of Water Supplied to IcemakerMonitor Panel Door Alarm Buzzer Mute ModeDisplay Power saving Mode Micom FunctionDescription of Function Exhibition ModeFilter condition display function Outside temperature display functionLCD Back Light Control Lock function display button lockExpress Freezer When ice maker does not operate smoothlyDispenser use selection Automatic ice makerSuper freezing Miracle Zone functionControl of variable type of freezing room fan Or home bar Door opening alarmControl of M/C room fan motor Doors of freezingSequential operation of built-in product Failure Diagnosis Function Test Function Mode Operation Contents RemarksFunction of dispenser and water dispenser built-in Test Mode 1 Status LCD Test Mode 2 Status LCDGR-P227/L227 Power circuitExplation for Micom Circuit Explanation for PWB circuitReset circuit Oscillation circuitGR-P227/L227/P257/L257 Load Driving Circuit Load/dispenser operation, door opening circuitDispenser operation circuit Lever Switch sensing circuit Measuring partDoor opening sensing circuit Short Open Temperature sensing circuitSwitch entry circuit Option designation circuit model separation functionSeparation Connection Status Application Standard Stepping motor operation circuit Fan motor driving circuit freezer, mechanical area +5 C +9F 33 k Ω 56 k Ω JCR1 Main PCB Sensor resistance characteristics table Miracle Zone Stepping Motor / Display Operation Principle Water supply amount Table Harvest ModeIcemaking Mode Fill/Park PositionDefect diagnosis function Stage Items Indicator RemarksCircuit Trouble Diagnosis Trouble ShootingNot performed Evaporator by heating as Refrigeration Refrigeration Residual Refrigeration No cooling air circulation Is weak Fan does not work Recess Sounds Compressor compartment operating sounds Bad soldering Bad rivet contact Short Structure Door foam Appearance Sag Problems Causes Checks Measures FaultsPower Problems Causes Checks Measures RemarksTemperature Cooling Disconnected from the motor Refer to fan motor disassembly Problems Causes Defrosting failureMeasures Remarks Remove the parts and replace it Icing Discharging port of cooling air Sound Click Contraction of evaporator Sources Sound Burping It happens when refrigerant expands Odor Micom Problems Symptom Causes Checks Measures RemarksDriving circuits Motor damper Replace door switch Trouble Diagnosis Items Unit Standards Purposes Remarks Cooling Cycle Heavy RepairSummary Of Heavy Repair Process Contents ToolsItems Precautions Precautions During Heavy RepairInserting a capillary tube When replacing a drierWhen replacing a compressor Practical Work For Heavy RepairCalculation of amount of refrigerant charged Pipe ConnectionVacuum Sequence Charging sequence12-0mm Standard Regulations For Heavy RepairBrazing Reference Drawings Asia / Middle-East AfricaEurope & CIS / America Explain general principles of sounds Problems Checks and MeasuresExplain the principles of temperature change Sound depends on the installation locationExplain the principles of water supplied to dispenser Explain the procedure and principles of ice maker operationExplain the flow of refrigerant Explain the characteriistics of moving partsMeasures for Symptoms on Temperature Explain the basic principles of frost formation Check the temperature control button and set at strongOdor and Frost Explain the basic principles of food odorOthers Remove a freezer door HOW to Disassemble and AssembleHandle InsertTubeLineColletClip Assembly COVER, Dispenser Exploded View Optional part Ref No. GR-P227/GR-P257Ref No. GR-L227/GR-L257 Freezer Compartment Optional part Refrigerator CompartmentMachine Compartment ICE & Water Part Dispenser Part No JD8999A