LG LSC27990ST Training Manual
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LG LSC27990ST Training Manual

LG LSC27990ST Training Manual

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LG TRAINING MANUAL
LG TRAINING MANUAL
LSC27990ST Refrigerator Info Center - Fall 2007

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  • Page 1 LG TRAINING MANUAL LG TRAINING MANUAL LSC27990ST Refrigerator Info Center - Fall 2007...
  • Page 2 Special components are also used to prevent shock and fire hazard and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.

  • Page 3: Table Of Contents

    Info Center Table of ConTenTs OVERVIEW ....................5 INTRODUCTION ....................5 TOPICS DISCUSSED IN THIS MANUAL ............... 5 MODEL NUMBER ....................5 OPERATION ....................6 MICROCONTROLLER ..................15 TROUBLESHOOTING ..................20 CIRCUIT DESCRIPTIONS ................22 Refrigerator Info Center Training Contents...
  • Page 4 - 4 -...

  • Page 5: Overview

    Info Center overview INTROduCTION This portion of some of our refrigerators allows the customer to view the weather present and forecasts for the next five days. It also stores images and recipes for a variety of foods, has a calendar that can be programmed for a variety of reminders such as birthday and anniversaries. It also allows the refrigerator and freezer temperature to be set by the customer without opening the door.

  • Page 6: Operation

    Info Center operaTion Temperature You can adjust the freezer and refrigerator temperature. 1. Press the TEMPERATURE button. 2. Using the up or down button, select the desired adjustment. 3. Select the temperature using the left or right buttons. Refrigerator temperature options: 46, 41, 37, 34, or 32°F Freezer temperature options: 7, 1, -2, -5, or -8°F 4.

  • Page 7: Automatic Icemaker

    Info Center operaTion Automatic icemaker • The automatic icemaker can automatically make 6 cubes at a time, 70~120 pieces per day. This quantity may vary by circumstance, including ambient temperature, door opening, freezer load. etc. • Ice making stops when the ice storage bin is full. •...
  • Page 8 - Reception of weather forecast information received and displayed on the screen may vary depending on your region and the location of the refrigerator.Therefore, LG does not guarantee and will not be held responsible for accuracy of the weather information.
  • Page 9 Info Center operaTion Anniversary Reminder - Register the anniversary date. - Select the Anniversary reminder using the button. Select the month using the up or down button. Press the up or down button to Press the down button and then select the date using the select Anniversary Reminder.
  • Page 10 Info Center operaTion Timer To set the alarm. Select time using right Press the down button Press the up or down or left button to select Save. button to select Timer - The alarm will go off at the set time, and the timer image will be displayed in the screen. Gourmet Recipes There are 10 classifications of recipes under this menu Use the up or down button to select the type of recipe...

  • Page 11: Door Alarm

    Info Center operaTion Door Alarm This is the function of notifying you every 30 seconds that the refrigerator door is open for more than 1 minute. - You can turn the door alarm on or off. Press the Menu button Use the up or down button to select the Door Alarm Use the right or left to select Use or Not to Use.
  • Page 12 Info Center operaTion Display Image You can select the standby screen setting. From the Settings menu. Select Display Image. Use the right or left button to select the image. Select Preview to preview the image full screen. You can still use right or left to scroll thru the images. Select Save to keep the image you selected.

  • Page 13: Photo Album

    Info Center operaTion Photo Album From the Settings menu. Select Photo Album. Use the right or left button to select a photo. Press the down button to display the image. The Right or left button will preview other photos. Here you have the option to set the photo as a background. Select Save to keep the photo you selected.

  • Page 14: Microcontroller

    Info Center operaTion MICROCONTROllER MICOM FUNCTION Door Alarm Buzzer Mute Mode Press door alarm button to turn the buzzer on or off. Demo Mode Demo mode is available for displaying the refrigerator in a sales setting or similar condition. It allows the display, dispenser, lights, and fan to operate without running the compressor. To enter the DEMO mode, press the TEMPERATURE and the LOCK button simultaneously and hold for 5 seconds until the Ding sounds.

  • Page 15: Lock Function

    Info Center operaTion Outside Temperature Display Function The ambient temperature sensor is located under the upper right hinge cover. This sensor reads the temperature of the room and displays it in the upper right corner of the display. The ambient temperature is displayed between 16 °F and 120 °F. Outside of that range, the display will show Er.
  • Page 16 Info Center operaTion ICE PLUS freezing ICE PLUS freezing is a function to increase the cooling speed of the freezer compartment by running both the compressor and the fan simultaneously. ICE PLUS is cancelled and the refrigerator returns to its default setting in the event of a power interruption.
  • Page 17 Info Center operaTion Control of cooling fan motor The cooling fan motor performs ON/OFF control by linking with the COMPRESSOR. It controls at the single RPM without varying RPM. Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure display).
  • Page 18 Info Center operaTion Refrigerator room lamp automatic off • Refrigerator room lamp turns on and off by refrigerator door switch. • If refrigerator door is open for 7 minutes, the refrigerator room lamp turns off automatically. Sequential operation of components Component products such as compressor, frost removal heater, freezing room fan, cooling fan, and step motor damper are sequentially started as follows to reduce noise and prevent part damage occurred due to starting of many parts during initial power and self test.

  • Page 19: Test Function

    Info Center TroUblesHooTinG TROublEShOOTING Test Function The test function assists in diagnosing the PWB and determining the exact mode of failure. The test button is on the main PCB. When test mode is engaged, it will complete its test cycle and default to normal operation after 2 hours.

  • Page 20: Troubleshooting

    Info Center TroUblesHooTinG Failure Diagnosis Function Failure diagnosis facilitates service when a failure code shows during product operation. When a failure is detected, the buttons are deactivated. If a failure code is released, the MICOM resets and normal operation continues. The failure code is displayed on the display screen. All display graphics that are not part of the failure code are turned off.

  • Page 21: Circuit Descriptions

    Info Center CirCUiT DesCripTions CIRCuIT dESCRIPTIONS EXPLANATION FOR MICOM CIRCUIT 1-13. Communication circuit and connection L/Wire between main PCB and display PCB The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LCD Display PCB.
  • Page 22 Info Center CirCUiT DesCripTions EXPLANATION FOR MICOM CIRCUIT 2) Sensor resistance characteristics table Refrigerator sensor 1&2 Measuring Temperature (°C) Freezing Sensor Defrost sensor, Ambient sensor -20 °C 22.3 kΩ 77 kΩ -15 °C 16.9 kΩ 60 kΩ -15 °C 13.0 kΩ 47.3 kΩ...

  • Page 23: Power Circuit

    Info Center CirCUiT DesCripTions Explanation of PWB circuit EXPLANATION FOR MICOM CIRCUIT Power circuit 1. Explanation for PWB circuit The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback 1-1.
  • Page 24 Info Center CirCUiT DesCripTions ANATION FOR MICOM CIRCUIT Oscillation circuit Oscillation circuit n circuit 1-3. Reset circuit Figure 1 ircuit generates a basic clock signal for synchronization and time calculation related to the transmission of The RESET circuit allows various parts of the MICOM, such as RAM, defrosting, etc., to be restarted from the initial state The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the ations made by the MICOM (IC1).
  • Page 25 Within 1 V Info Center Status 12 V CirCUiT DesCripTions (1) GR-G277STSA(LSC27990TT) LOAD DRIVE SCHEMATIC LOAD DRIVE SCHEMATIC EXPLANATION FOR MICOM CIRCUIT 1-5. Dispenser operation circuit (1) GR-G277STSA(LSC27990TT) DISPENSER CIRCUIT DISPENSER CIRCUIT - 24 - 1) Check load driving status Refrigerator Info Center Training Circuit Descriptions WATER VALVE...
  • Page 26 Info Center CirCUiT DesCripTions LOAD DRIVE STATUS LOAD DRIVE STATUS 1) Check load driving status WATER VALVE PILOT GEARED SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER VALVE WATER Measuring part IC7-15 IC7-14 IC7-13 IC7-12 IC7-11 Within 1 V Status 12 V 2) Lever Switch sensing circuit LEVER SWITCH CIRCUIT...
  • Page 27 The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and Info Center the refrigerator. The icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and the efficiency of the defrost operation. See the table below for voltages and CirCUiT DesCripTions checkpoints.
  • Page 28 Info Center EXPLANATION FOR MICOM CIRCUIT CirCUiT DesCripTions Stepping motor operation circuit Stepping motor operation circuit 1-10. Stepping motor operation circuit (1) GR-G277STSA(LSC27990TT) The motor is driven by magnetism formed in the areas of the coils and the stator. The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal is applied to MICOM Pin 33 of IC10 (TA7774F).
  • Page 29 Info Center CirCUiT DesCripTions EXPLANATION FOR MICOM CIRCUIT Temperature compensation and temperature 1-12. Temperature compensation and temperature compensation circuit 1. Temperature compensation in freezer and refrigerator compensation circuit (1) GR-G277STSA(LSC27990TT) Temperature compensation in freezer and refrigerator Temperature compensation at refrigerator Temperature compensation at freezer Temperature compensation at refrigerator Temperature compensation at freezer...
  • Page 30 Info Center CirCUiT DesCripTions EXPLANATION FOR MICOM CIRCUIT Temperature compensation table at the refrigerator is as follows: u Temperature compensation table at the refrigerator is as follows: Modification resistance 470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ...
  • Page 31 Info Center CirCUiT DesCripTions EXPLANATION FOR MICOM CIRCUIT 2. Compensation circuit for temperature at freezer Compensation circuit for temperature at freezer (1) GR-G277STSA(LSC27990TT) Temperature compensation in CUT JCR1 +1 °C [+1.8 °F] +2 °C [+3.6 °F] JCR2 +1 °C [+1.8 °F] JCR3 -1 °C [-1.8 °F] -2 °C [-3.6 °F]...
  • Page 34 2007 Info Center Refrigerator Training...

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