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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
models
LRTN19310 LRTN22310
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CONTENTS SAFETY PRECAUTIONS ....................................................................................................................................................... 2 SPECIFICATIONS................................................................................................................................................................... 3 PARTS IDENTIFICATION......................................................................................................................
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1. SPECIFICATIONS Ref. No.: 19Cuft / 22Cuft ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Slide Rounded VEGETABLE TRAY Opaque Drawer Type 755 X 806 X 1664 (W X D X H) - 19 Cu.ft COMPRESSOR PTC Starting Type DIMENSIONS (mm) 831 X 806 X 1715 (W X D X H) - 22 Cu.ft EVAPORATOR Fin Tube Type 91 (19 cu.ft) CONDENSER Wire Condenser NET WEIGHT (kg) 101 (22 cu.ft) REFRIGERANT R-134a (155 g) COOLING SYSTEM Fan Cooling LUBRICATING OIL Freol@10G (310 cc) TEMPERATURE CONTROL Micom Control DEFROSTING
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2. PARTS IDENTIFICATION FREEZER COMPARTMENT Ice Bin Freezer Door Bin Freezer Shelf REFRIGERATOR COMPARTMENT Digital Sensor Control Can Dispenser Snack Corner Dairy Bin Shelves Egg Tray Door Bin Crisper Keeps fruits and vegetables fresh and crisp. Refrigerator Door Rack Base Grille - 4 -
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3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH Freezer Door 1. To remove the door switch, pry it out with a slotted-type 1. Remove the hinge cover by pulling it upwards. driver, as shown in (Figure 4). 2. Loosen hexagonal bolts attaching the upper hinge to the 2. Disconnect the lead wire from the switch. body and lift the freezer door. LEAD WIRE HINGE COVER BOLT DOOR SWITCH HINGE Figure 4 Figure 1 3. Pull out the door gasket to remove from the door foam assembly. GASKET Figure 2 Refrigerator Do
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3-3 FAN AND FAN MOTOR 3-5 LAMP 1. Remove the freezer shelf. (If your refrigerator has an icemaker, remove the icemaker first) 2. Remove the grille by pulling it out and by loosening a screw. 3. Remove the Fan Motor assembly by loosening 4 screws and disassemble the shroud. 4. Pull out the fan and separate the Fan Motor and Bracket. Figure 8 FAN MOTOR SHROUD 3-5-1 Refrigerator Compartment Lamp 1. Unplug the power cord from the outlet. 2. Remove refrigerator shelves. 3. Release the hooks on both
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4. ADJUSTMENT 4-2-3 PTC-Applied Circuit Diagram 4-1 COMPRESSOR Starting Method for the Motor 4-1-1 Role The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses OVERLOAD PROTECTOR this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser. N C 4-1-2 Composition PTC COMPRESSOR The compressor includes overload protection. The PTC 2 5 MOTOR starter and OLP (overload protector) are attached to the M S out
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4-3 OLP (OVERLOAD PROTECTOR) 4-4 TO REMOVE THE COVER PTC 4-3-1 Definition of OLP (1) OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP. (2) When high current flows to the Compressor motor, the Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the current flowing to the Compressor Motor. 4-3-2 Role of the OLP (1) The
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5. CIRCUIT DIAGRAM GOOD MODEL - 9 -
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6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS YES (Reated Voltage Remove PTC-Starter 1 2 Power Source. ±10%)? from Compressor and measure voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. YES OLP disconnected? No Voltage. Replace OLP. 5 Check connection condition. Reconnect. Applied voltage isn't Advise customer that in range of Rating power supply needs to be 5 checked by an electrician. Voltage ±10%. Readings OK Check Check resistance 3 2 between M-C, S-C and r
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6-2 PTC AND OLP Normal operation of Check another Separate PTC-Starter Observation value is Compressor is from Compressor and 115V/60Hz : 6.8Ω ±30% electric component. measure resistance impossible or poor. between No. 5 and 6 of PTC-Starter with a Replace PTC- The resistance value Tester.(Figure 12) is 0Ω (short) or Starter ∞ (open). Shows continuity Separate OLP from Check another Compressor and check electric component. resistance value between two terminals Open of OLP with a Tester. Repla
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6-3 OTHER ELECTRIC COMPONENTS Not cooling at all Check for open short or Compressor Cause incorrect resistance readings doesn't run. in the following components a. Starting devices Short, open or broken. Poor contact b. OLP or shorted. Coil open or shorted. c. Compressor coil Replace Poor contact d. Wiring harness indicated component. or shorted. Poor cooling performance Compressor runs Check a starting Low voltage. Raise voltage. poorly. voltage. Replace Check voltage at Poor or broken or
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6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • Is the power cord unplugged from the outlet? • Plug into the outlet. • Check if the power Switch is set to OFF. • Set the switch to ON. • Check if the fuse of the power Switch is shorted. • Replace the fuse. • Measure the voltage of the power outlet. • If the voltage is low, correct the wiring. Cools poorly. • Check if the unit is placed too close to the wall. • Place the unit about 10 cm from the wall. • Check if th
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DEFECTIVE LEAKAGE RESTRICTED BY DUST COMPRESSION 6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient • to a leak. Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by cool normally. • restoring the normal amount of • refrigerant a
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General Control of Refrigerating Cycle NO. ITEMS UNIT STANDARDS PURPOSES REMARKS Pipe and Min. Pipe: within 1 hour. To protect The opening time should be reduced 1 piping system Comp: within 10 minutes. moisture to a half of the standards during rain opening time Drier: within 20 minutes. penetration. and rainy seasons (the penetration of water into the pipe is dangerous). Welding Nitrogen Weld under Nitrogen To protect oxide - Refer to repair note in each part. 2 pressure atmosphere. scale fo
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Initial power on 7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 7-1 FUNCTION 7-1-1 Function 1. When the appliance is plugged in, it is set to "3" for the Refrigerator. You can adjust the Refrigerator control temperature by pressing the ADJUST button. 2. When the power is initially applied or restored after a power failure, it is automatically reset to "3". 12 3 4 5 WARMER COLDER TEMPERATURE ADJUST 7-1-2 Defrost Cycle 1. A defrost cycle will be initiated after 4 hours of accumulated compressor
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7-1-4 Defect Diagnosis Function 1. Defect diagnosis functions are easy SVC when defects occur which can affect product performance. 2. When a defect occurs, the buttons will not operate; but the tones. such as "ding". will sound. 3. When the defect CODE removes the sign, it returns to normal operation (RESET). 4. The defect CODE shows on the refrigerator DISPLAY as temperature LED, and the other LED turns off. Defect code panel 12 3 4 5 WARMER COLDER TEMPERATURE ADJUST - ERROR CODE on Refriger
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7-1-5 TEST Mode 1. The Test mode allows checking the PCB and the function of the product as well as finding out the Defective part in case of an error. 2. The test button is on the main PCB of the refrigerator (Test S/W). The test mode will be cleared in 2 hours regardless of the type of test mode. 3. While in the test mode, the ADJUST button will not operate. 4. After exiting the test mode, be sure to reset by unplugging and then plugging in the appliance. 5. If an error (such as a sensor failu
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7-2 PCB FUNCTION 7-2-1 Power Circuit 1. Power is supplied to the control board at pins 1 and 5 of connector #4. - 19 -
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7-2-2 Load / Buzzer Drive & Open Door Detection Circuit 1. Load Drive Condition Check To measure outputs of the control board, check voltages between the pins for the following components: Circuit Pin Number Pin Number Output Voltage Compressor Con1 pin1 Con4 pin1 115 VAC Condenser fan Con1 pin1 Con4 pin1 115 VAC Evaporator fan Con1 pin1 Con4 pin1 115 VAC Defrost heater Con1 pin3 Con4 pin1 115 VAC F,R-lamp Con1 pin5 Con4 pin1 115 VAC NOTE: When the door of the freezer/refrigerator is left open f
