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8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
8-1 FUNCTION
8-1-1 Function
1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer.
You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button.
2. When the power is initially applied or restored after a power failure, it is set to Control temperature Previously.
8-1-2 How to Toggle the Display between °F & °C
1. The initial setting is °F and the display temperature mode can be changed from °F to °C or °C to °F by pressing and holding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds.
8-1-3 Lock function (dispenser and display button lock)
1. When the refrigerator is first turned on, the buttons are not locked. The display panel shows the padlock unlocked icon.
2. To lock the display, the dispenser, and the control panel, press and hold the LOCK button for 3 seconds. The locked pad lock icon is displayed.
3. The LOCK button is the only control feature that remains active in the locked state. The buzzer sound, other control buttons, and the dispenser are deactivated.
4. To release from the locked state, press and hold the LOCK button again for 3 seconds.
Press & Hold
8-1-4 Filter condition display function
1. There is a replacement indicator cartridge on the dispenser.
for the filter
2. Water filter needs replacement once six months or of using water filter.
3. Water Filter icon turn on to tell you need to replace the filter soon.
4. After replacing the filter, press and hold the lock button more than 3 seconds.
Water Filter icon turn off with reset status.
Classification
Filter Status
Display
In initial Power On
/ Filter RESET
Press & Hold
Ex) In selecting
"LOCK"
Ex) In selecting
"LOCK" again
Replace indicator light on
- 28 -
8-1-5 Ice Plus selection
Please select this function for quick freezing.
• Function is repeat Ice Plus Icon whenever pressing Ice Plus button.
• Ice Plus function automatically turns off after a fixed time passes.
8-1-6 Dispenser use selection
You can select water or ice.
∗ Select water, crushed ice, or ice cubes by cycling through the selections when pressing the DISPENSER button,
∗ Hold your cup in the dispenser for a few seconds after dispensing ice or water to allow the last pieoes of ice or drops of water to fall into the cup.
∗ When after initially establ ishing the water comes out, the water tank inside fills and until at the time of quality the hour is caught.
8-1-7 DISPENSER LIGHT
-Whenever pressed the LIGHT button, DISPLAY is changed as belows.
Pressing
Switch
Auto Auto on
Normal status: When dispenser is operated, DISPENSER LIGHT is ON.
AUTO status: Detecting the lighting of room by LIGHT SENSOR, DISPENSER LIGHT is on and off automatically.
ON status: DISPENSER LIGHT is on continuously.
8-1-8 CONTROL OF FREEZER FAN MOTOR
1. Freezer fan motor has high and standard speeds.
2. High speed is used at power-up, for Ice Plus, and when refrigerator is overloaded.
Standard speeds is used for general purposes.
3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high.
4. High speed (2700RPM) : Initial power on or load corresponding operation, Ice Plus
Normal speed (2400RPM) : General working conditions.
5. Fan motor stops when refrigerator or freezer door opens.
8-1-9 Cooling Fan Motor
1. The cooling fan is switched ON and OFF in conjunction with the compressor.
2. The cooling fan runs at a single speed.
3. The Failure sensing mathod is the same as in the fan motor of the freezing fan motor(refer to failure diagnosis function table for failure display).
8-1-10 Icing Fan
The Icing Fan is controlled by the the sensor on the top of the ice room.
The Failure sensing mathod is the same as in the fan motor of the freezer
(refer to failure diagnosis function table for failure display)
- 29 -
8-1-11 Ice Plus
1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.
2. Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF.
3. If there is a power outage and the refrigerator is powered on again, Ice Plus will be canceled.
4. To activate this function, press the Ice Plus key and the LED will turn ON. This function will remain activated for 24 hrs.
The first three hours the compressor and Freezer Fan will be ON. The next 21 hours the freezer will be controlled at the lowest temperature. After 24 hours or if the Ice Plus key is pressed again, the freezer will return to its previous temperature.
5. During the first 3 hours:
(1) Compressor and freezer fan (HIGH RPM) run continuously.
(2) If a defrost cycle begins during the first 90 minutes of Ice Plus, the Ice Plus cycle will complete its cycle after defrosting has ended.
If the defrost cycle begins when Ice Plus has run for more than 90 minutes, Ice Plus will run for two hours after the defrost is completed.
(3) If Ice Plus is pressed during defrost, Ice Plus LED is on but this function will start seven minutes after defrost is completed and it shall operate for three hours.
(4) If Ice Plus is selected within seven minutes after compressor has stopped, the compressor (compressor delays seven minutes) shall start after the balance of the delay time.
(5) The fan motor in the freezer compartment runs at high speed during Ice Plus.
6. For the rest of the 21 hours, the freezer will be controlled at the lowest temperature.
8-1-12 FREEZER & REFRIGERATOR LAMP AUTO OFF
1. To avoid heat damage caused by the lamp, it is turned off automatically when the refrigerator door is open for more than 7 minutes.
8-1-13 Alarm for Open Door
1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened.
2. One minute after the door is opened, the buzzer sounds three times each for 1/2 seconds. These tones repeat every 30 seconds.
3. The alarm is cancelled when the freezer or the refrigerator is closed while the buzzer sounds.
Freezer Door or Refrigerator
Door
Closed Open Closed Open
3 Times 3 Times 3 Times 3 Times
Closed
Buzzer
Within 1 min.
1 min.
30 sec 30 sec 30 sec
- 30 -
8-1-14 Defrosting (removing frost)
1. Defrosting starts each time the COMPRESSOR running time reaches 7 hours.
2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.
3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in
2 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-15.)
4. Defrosting won’t function if its sensor is defective (wires are cut or short circuited)
8-1-15 Defect Diagnosis Function
1. Automatic diagnosis makes servicing the refrigerator easy.
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 and Freezer Display.
✽ LED check function: If simultaneously pressing Ice Plus button and freezing temperature adjustment button for a second, display LED graphics on. If releasing the button, the LED graphic displays the previous status.
- 31 -
ERROR CODE on display panel
NO
Error Detection
Category
Normality
Error Display
Freezer
Temperature
Ref.
Temperature
1
2
3
4
5
6
7
8
9
Freezer Sensor
Error
Refrigerator
Sensor Error
Defrosting
Sensor Error
Icing Sensor
Error
Poor Defrosting
Abnormality of
BLDC FAN Motor for Ice Making
Abnormality of
BLDC FAN Motor for Freezer
Abnormality of
BLDC FAN Motor for Mechanic Room
Er
Er
Er
Er
Er
Er
Er
Er
FS rS dS
IS dH
IF
FF
CF
Error Generation Factors
None
Short or Disconnection of Freezer Sensor
Short or Disconnection of Refrigerator Sensor
Short or Disconnection of Defrosting Sensor
Short or Disconnection of Icing Sensor
Even though it is passed
1 hour since then
Defrosting , if Defrosting sensor is not over 8
°C
, it is caused
It is caused when F/B signal isn’t over 115 seconds during BLDC
FAN motor operating
It is caused when F/B signal isn’t over 115 seconds during BLDC
FAN motor operating
It is caused when F/B signal isn’t over 115 seconds during BLDC
FAN motor operating
Remark
Normal operation of
Display
Each Sensor have to check disconnection
Temperature Fuse
Disconnection,Heater disconnection, DRAIN Jam,
Poor Relay for Heater
Poor BLDC Motor connection, DRIVE IC, and
TR
Poor BLDC Motor connection, DRIVE IC, and
TR
Poor BLDC Motor connection, DRIVE IC, and
TR
10
Communication
Error
Er CO
Communication Error between Micom of Main
PCB and Display Micom
Poor Communication connection,Poor TR of
Transmitter and Receiver
- 32 -
8-1-16 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 mode is operated by pressing two buttons at Display panel.
3. While in the test mode, the function control button is not recognized, but the recognition tone sounds.
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 failure, is detected while in the test mode, the test mode is cleared and the error code is displayed.
6. While an error code is displayed, the test mode will not be activated.
Table 1. Function Test
MODE REMARKS
TEST1
TEST2
TEST3
RESET
OPERATION
Push FREEZER KEY and
LOCK KEY at the same time over 5 deconds OR
Push Test Switch (in the main Board) once.(See page 39)
Push FREEZER KEY and
LOCK KEY at the same time over 5 seconds in
TEST MODE 1 OR Push
TEST Switch once in TEST
MODE1.(See page 39)
Push FREEZER KEY and
LOCK KEY at the same time over 5 seconds in
TEST MODE 2 OR Push
TEST Switch once in TEST
MODE2.(See page 39)
Push FREEZER KEY and
LOCK KEY at the same time over 5 seconds in
TEST MODE 3 OR Push
TEST Switch once in TEST
MODE3.(See page 39)
FUNCTION
1) Continuous operation of the
COMPRESSOR and the Freezer fan
2) Stepping DAMPER OPEN
3) Defrosting HEATER OFF
4) DISPLAY LED all ON
1) Continuous operation of the
COMPRESSOR and the Freezer fan
2) Stepping DAMPER CLOSE
3) Defrosting HEATER OFF
4) DISPLAY LED shows no. 2
1) COMPRESSOR and the Freezer fan
OFF
2) Stepping DAMPER CLOSE
3) Defrosting HEATER ON
4) DISPLAY LED shows no. 3
Reset to the previously setting
Before TEST MODE.
Reset if the
Temperature of the
Defrosting Sensor is
46˚F(8˚C)or more.
The compressor will
Start after a 7-minute
Delay.
- 33 -
8-2 PCB FUNCTION
8-2-1 Power Circuit
1. Power is supplied to the control board at pin1 and 3 of connector #1.
- 34 -
8-2-2 Load / Fan & 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
I/Maker Pilot Valve
Lamp-R
Barrier Heater
Lamp-F
Def Heater
Water Pilot Valve
Compressor
Out Plate, Front, R-Door, L-Door Heater
Pin Number
Con3 Pin3
Con3 Pin9
Con3 Pin8
Con3 Pin7
Con3 Pin10
Con3 Pin11
Con3 Pin12
Con3 Pin5
Pin Number
Con3 Pin2
Con3 Pin2
Con3 Pin2
Con3 Pin2
Con3 Pin2
Con3 Pin2
Con3 Pin2
Con3 Pin2
Output Voltage
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
NOTE: When the door of the freezer/refrigerator is left open for 7 minutes or longer, the lamp of the freezer’refrigerator turns.
2-1. Freezing compartment fan
MOTOR OFF
MOTOR ON
Pin1 & 2 of con4
2V or less
13V~15V
- 35 -
2-2. Machine compartment fan
MOTOR OFF
MOTOR ON
Pin7 & 8 of con4
2V or less
13V~15V
2-3. Icing compartment fan
MOTOR OFF
MOTOR ON
Pin4 & 5 of con4
2V or less
13V~15V
- 36 -
3. Open Door Detection Circuit Check
Freezer/
Measurement
Location
Refrigerator Door
Closed
Open
8-2-3 Temperature Sensor Circuit
Pin 4 & 5 of con4 Ref.Door
Pin 5 & 6 of con5 Fre.Door
0 V
5 V
TEMPERATURE
- 20 ˚C (-4 °F)
- 15 ˚C (5 °F)
- 10 ˚C (14 °F)
- 5 ˚C (23 °F)
0 ˚C (32 °F)
+ 5 ˚C (41 °F)
+ 10 ˚C (50 °F)
+ 15 ˚C (59 °F)
+ 20 ˚C (68 °F)
+ 25 ˚C (77 °F)
+ 30 ˚C (86 °F)
+ 40 ˚C (104 °F)
+ 50 ˚C (122 °F)
RESISTANCE OF FREEZER/Icing
SENSOR
22.3 K
Ω
16.9 K
Ω
13.0 K
Ω
10.1 K
Ω
7.8 K
Ω
6.2 K
Ω
4.9 K
Ω
3.9 K
Ω
3.1 K
Ω
2.5 K
Ω
2.0 K
Ω
1.4 K
Ω
0.8 K
Ω
RESISTANCE OF REFRIGERATOR &
DEFROST SENSOR & ROOM SENSOR
77 K
Ω
60 K
Ω
47.3 K
Ω
38.4 K
Ω
30 K
Ω
24.1 K
Ω
19.5 K
Ω
15.9 K
Ω
13 K
Ω
11 K
Ω
8.9 K
Ω
6.2 K
Ω
4.3 K
Ω
• The resistance of the SENSOR has a ±5% common difference.
• Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.
This delay is necessary due to sensor response speed.
- 37 -
8-2-4 Refrigeration Compartment Stepping Motor Damper Circuit
A reversible DC motor is used to open and close the damper.
To open the damper, push test button once.
To close the damper, push test button twice.
8-2-5 Dispenser Drive Circuit
Circuit
Auger Motor
Solenoid Cube
Pilot/ Water Valve
Solenoid Dispenser
Dispenser Lamp
Heater
Pin Number
Con2 Pin5
Con2 Pin3
Con2 Pin1
Con3 Pin9
Con3 Pin7
Con3 Pin5
- 38 -
Pin Number
Con2 Pin7
Con2 Pin7
Con2 Pin7
Con3 Pin3
Con3 Pin3
Con3 Pin3
Output Voltage
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
8-3 TROUBLESHOOTING
PROBLEM INDICATED BY
POWER
SOURCE is poor.
1. The whole
COOLING is poor.
2. DISPLAY LED
NO COOLING.
CHECK
1. FREEZER/
REFRIGERATOR.
CHECKING METHOD
Check if
FREEZER/REFRIGERA
TOR DOOR IS OPEN and check display.
CAUSE
POWER SOURCE is poor.
Check visually.
Applied voltage error.
SOLUTION
Replace Main PWB
2. If LAMP is dim.
3. The connection of the
MAIN PWB
CONNECTOR.
Replace
Main PWB
Reconnect
CONNECTOR
1. If the COMPRESSOR operate.
USE TEST MODE1
(forced COOLING).
If less than 7 minutes pass after compressor shuts off, don’t press the
KEY and wait.
COMPRESSOR locked or blocked.
OLP, PTC is poor.
COMPRESSOR RELAY is poor.
Replace OLP, PTC.
Replace MAIN PWB.
THE CONNECTING
WIRE is poor.
Replace
Main PWB
2. If refrigerant is leaking.
Check connection of
CONNECTOR.
Measure the amount of frost sticking on
EVAPORATOR and the surface temperature of the condenser pipe.
CONNECTOR connection is poor.
TRANS FUSE is open.
Refrigerant leakage.
Check the connection of the black wire of the
MAIN PWB
CONNECTOR (CON3).
Replace the leaking part and replace any lost refrigerant.
FREEZER
TEMPERATURE is incorrect
1. If FAN MOTOR operates.
USE TEST MODE1
(forced COOLING).
FAN MOTOR is poor.
Replace the FAN
MOTOR.
CONNECTING WIRE is poor.
Certify the MOTOR and the connection of the black wire of the MAIN
PWB CONNECTOR
(CON4).
2. If DEFROSTING is normal.
3. If SENSOR is normal.
4. Door Line contact.
Check the amount of frost sticking on the
EVAPORATOR .
DEFROSTING is poor.
of the Refrigerator
SENSOR.
Check the seal when the door is closed.
Door liner damaged.
See DEFROSTING is poor.
SENSOR RESISTANCE is poor.
Replace SENSOR.
Replace door liner.
- 39 -
PROBLEM INDICATED BY
COOLING is poor.
If
REFRIGERATOR
TEMPERATURE is too low.
CHECK
1. If FREEZER
TEMPERATURE is normal.
2. If amount of cool air from FAN MOTOR is sufficient.
CHECKING METHOD
Check is FREEZER
TEMPERATURE is too low.
Make sure that the amount and speed of cool air are sufficient by touching the check supplied on the
REFRIGERATOR.
CAUSE
FAN MOTOR is poor.
Passage of cool air is blocked.
EVA frozen.
DEFROSTIN
G is poor.
NO
DEFROSTING.
SOLUTION
Make sure the DOOR isattached.
Replace FAN MOTOR.
Remove impurities.
See DEFROSTING is poor.
Replace Door liner.
3. Door Line contact.
Check door seal when door is closed.
Door liner damaged.
1. If HEATER emits heat.
USE TEST MODE3
(forced DEFROSTING).
HEATER disconnection.
Replace HEATER.
TEMPERATURE FUSE disconnection.
Replace
TEMPERATURE FUSE.
2. If DRAIN PIPE is blocked.
3. If ice remains after
DEFROSTING.
Connection is poor.
Check EVAPORATOR connection and wire of
MAIN PWB
CONNECTOR.
DEFROST-SENSOR is poor.
Replace DEFROST-
SENSOR.
Check DRAIN PIPE.
HEATER RELAY is poor.
Replace RY3 of MAIN
PWB.
DRAIN PIPE is blocked.
Remove ice and impurities.
Check HEATER PLATE resistance.
Reassemble the
DEFROST-SENSOR.
Make sure that
DEFROST SENSOR is connected.
Connection is poor.
Make sure that
FREEZER
/REFRIGERATOR
DOOR is closed.
DOOR does not close properly.
Reassemble DOOR.
Replace GASKET.
- 40 -
8-4 MAIN PWB ASSEMBLY AND PARTS LIST
8-4-1 Main PWB Assembly
Connector7 Connector6 Connector5 Connector4
Test Switch
Connector1 Connector2
- 41 -
Connector3
8-4-2 Dispenser Drive PWB Assembly
Connector1
Connector2
Connector3
Connector4
- 42 -
9. EXPLODED VIEW & REPLACEMENT PARTS LIST
316A
CASE PARTS
CAUTION: Use the part number to order part, not the position number.
S03
S01
207B
402A
B01
271B
S01
103B
271C
103A
S03
207A
207C
S02
B01
501F
271B
402A
271A
406D
503D
410G
S02
50
0A
610A
S10
145B
411A
S11
409B
410A
409D
120B
626A
624D
607A
624C
282F
S08
624A
145A
S12
313A
282G
S11
158A
262B
S14
301A
406B
B02
400A
105A
318A
317A
S18
304A
314A
300A
303C
323B
420A
S20
312A
310B
327A
319C
329C
S19
319A
262H
410 H
106A
S15
610A
S14
249D
B03
249C
106A
409B
315B
315C
B03
283B
158B
4
07B
S16
315A
103C
407A
283B
B03
408A
332A
316B
405F
404A
405C
405B
329A
135D
315C
315B
S17
B04
- 43 -
FREEZER PARTS
CAUTION: Use the part number to order part, not the position number.
145F
250C
250D
131A
250A
136B
250D
250C
145C
237C
136A
- 44 -
REFRIGERATOR PARTS
CAUTION: Use the part number to order part, not the position number.
141B
141A
141B
141A
141C
141B
141A
141C
141B
140A
141C
140C
140B
161F
*
161C
*
161A
*
154B
*
154A
*
161D
140D
160B
14 1 D
167B
161C
*
160B
151C
151A
161E
*
161A
*
161D
*
*
: on ly LFX21960**
- 45 -
DOOR PARTS
CAUTION: Use the part number to order part, not the position number.
241A
241C
230B
231B
233B 233C
23
4B
241B
233D
23
4A
230A
233A
231A
212G
147C
147B
147A
241
D
146A
241
E
▲
262C
243A
243B
S25
24
4A
281C
281F
281E
S34
250A
200A
615A
281F
281D
241G
241
F
237A
249A
250B
249G
249E
S34
205C
205A
*
203A
201A
B06
24
4A
▲
262C
S25
243A
243B
205B
250B
212D
B06
*
: on ly LFX25960**
▲ only for the service
249B
249F
249H
- 46 -
DISPENSER PARTS
CAUTION: Use the part number to order part, not the position number.
278B
278A
278C
402C
278F
278D
405A
275A
276A
279B
279E
279D
501A 276B
280B
280C
281A
279A
- 47 -
ICE & MAKER PARTS
CAUTION: Use the part number to order part, not the position number.
617A
616G
616G
623B
616H
623B
616H
603A
616 D
625A
616D
616F
627A
619A
603B
- 48 -
ICE BANK PARTS
CAUTION: Use the part number to order part, not the position number.
606A
630J
600A
61 1 A
630E
630D
630F
630B
630C
630A
630L
630K
630M
630N
630H
630G
- 49 -
P/No. 3828JL8795A APR., 2006 Printed in Korea
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