LG GR-B-L207EC-ER Service Manual ▷ View online
1. Working Principles
1-1. Ice Maker Working Principles
1-2. Dispenser Working Principles
1. This function is available in Model GR-P247, GR-P207 and GR-L247, GR-L207 where water and ice are available without
opening freezer compartment door.
2. “Crushed Ice” is automatically selected when power is initially applied or reapplied after power cut.
3. When dispenser selection switch is continuously pressed, light is on in the following sequence:
“Water”
→
“Cube Ice”
→
“Crushed Ice”.
4. Lamp is on when dispenser rubber button is pressed and vice versa.
5. When dispenser crushed ice rubber button is pressed, dispenser solenoid and geared motor work so that crushed ice can
be dispensed if there is ice in the ice bank.
6. When dispenser cube ice rubber button is pressed, dispenser solenoid, cube ice solenoid and geared motor work so that
cube ice can be dispensed if there is ice in the ice bank.
7. When dispenser water rubber button is pressed, water valve opens and water is supplied if water valve is normally
installed on the right side of the machine room.
8. Ice and water are not available when freezer door is open.
ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
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• Level Ice Maker Cube Mould for “Initial Control”
after power is input.
after power is input.
Power Input
Initial Control
Ice Making Control
Ice Ejection Control
Water Supply Control
Test Control
• Wait until the water in the cube mould is frozen
after ice maker starts operation.
after ice maker starts operation.
• Check ice bank is full of ice by rotating ice ejection
motor in normal and reverse direction and eject ice into
the ice bank if ice bank is not full.
motor in normal and reverse direction and eject ice into
the ice bank if ice bank is not full.
• This is for refrigerator assembly line and service. When “ice making test switch” is pressed,
it operates in the following steps: initial ice ejection water supply control steps.
it operates in the following steps: initial ice ejection water supply control steps.
• Conduct “Ice Making Control” after supplying water into the ice maker
cube mould by operating water valve.
cube mould by operating water valve.
2. Function of Ice Maker
2-1. Initial Control Function
1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of
MICOM initialization. The detecting lever moves up and down.
2. The level of ice maker cube mould is judged by output signal, high and low signal, of Hall IC. Make the cube mould to be
horizontal by rotating ice ejection motor in normal or reverse direction so that High/Low signal can be applied to MICOM
Pin No. 44.
Pin No. 44.
3. If there is no change in signals one minute after the geared motor starts to operate, it stops icemaker operation and check
the signal every hour. It resets initialization of icemaker when it becomes normal.
4. It judges that the initial control is completed when it judges the ice maker cube mould is horizontal.
5. Ice ejection conducts for 1 cycle irrespect of ice in the ice bank when power is initially applied.
2-2. Water Supply Control Function
1. This is to supply water into the ice maker cube mould by operating water valve in the machine room when ice ejection
control is completed and ice maker mould is even.
2. The quantity of water supplied is determined by DIP switch and time.
<Water Supply Quantity Table>
3. If water supply quantity setting is changed while power is on, water supplies for the amended time. If DIP switch is
changed during water supply, water shall be supplied for the previous setting time. But it will supply for the amended time
from the next supply.
from the next supply.
4. When water supply signal is applied to water and ice valves at the same time during water supply, water shall be supplied
to water valve. If water supply signal is applied to ice valve during water supply, water shall be supplied to both water and
ice valves.
ice valves.
2-3. Ice Making Control Function
1. Ice making control is carried out from the completion of water supply to the completion of ice making in the cube mould.
Ice making sensor detects the temperature of cube mould and completes ice making. (ice making sensor is fixed below
ice maker cube mould)
ice maker cube mould)
2. Ice making control starts after completion of water supply control or initial control.
3. It is judged that ice making is completed when ice making sensor temperature reaches at -8
°
C after 100 minutes when
water is supplied to ice maker cube mould.
4. It is judged that ice making is completed when ice maker sensor temperature reaches below -12
°
C after 20 minutes in
condition 3.
ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
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DIP SWITCH SETTING
No
S/W 1
S/W 2
S/W 3
WATER SUPPLY TIME
REMARKS
1
OFF
OFF
OFF
6.5 Sec.
2
ON
OFF
OFF
5.5 Sec.
3
OFF
ON
OFF
6 Sec.
4
ON
ON
OFF
7 Sec.
5
OFF
OFF
ON
7.5 Sec.
6
ON
OFF
ON
8 Sec.
7
OFF
ON
ON
9 Sec.
8
ON
ON
ON
10 Sec.
* The quantity of water supplied
depends on DIP switch setting
conditions and water pressure as it is
a direct tap water connection type.
(the water supplied is generally 80 cc
to 120 cc)
conditions and water pressure as it is
a direct tap water connection type.
(the water supplied is generally 80 cc
to 120 cc)
* DIP switch is on the main PWB.
2-4. Ice Ejection Control Function
1. This is to eject ice from ice maker cube mould after ice making is completed.
2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice
2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice
ejection but waits. If the ice bank is full, ice ejection motor rotates in normal direction in every hour to check the condition
of ice bank. If the ice bank is not full, the water supply control starts after completion of ice ejection control. If the ice bank
is full, ice ejection motor rotates in reverse direction and sops under ice making or waiting conditions.
of ice bank. If the ice bank is not full, the water supply control starts after completion of ice ejection control. If the ice bank
is full, ice ejection motor rotates in reverse direction and sops under ice making or waiting conditions.
3. If ice bank is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould and ice
checking lever raises.
4. Ice ejection motor stops for 1 second if Hall IC signal changes from OFF (low) to ON (high) after 3.6 seconds when ice
ejection motor rotates in normal direction. If there is no change in Hall IC signals within 1 minute after ice ejection motor
operates, ice ejection motor stops as ice ejection motor or hall IC is out of order.
operates, ice ejection motor stops as ice ejection motor or hall IC is out of order.
5. If ice ejection motor or Hall IC is abnormal, ice ejection motor rotates in normal direction to exercise initial operation. It
resets the ice maker if ice ejection motor or Hall IC is normal.
6. The mould stops for 1 second at maximum tilted conditions.
7. The mould returns to horizontal conditions as ice ejection motor rotates in reverse direction.
8. When the mould becomes horizontal, the cycle starts to repeat:
7. The mould returns to horizontal conditions as ice ejection motor rotates in reverse direction.
8. When the mould becomes horizontal, the cycle starts to repeat:
Water Supply
→
Ice Making
→
Ice Ejection
→
Mould Returns to Horizontal
ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
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Bank is
not full
HALL IC
OUTPUT
SIGNALS
Bank is
full
HALL IC
OUTPUT
SIGNALS
ICE CHECKING
AXIS
ICE CHECKING LEVEL 30°
Maximum tilting
point
Ice making
(Original point)
Lock
2±1 sec
9±3 sec
8±3 sec
Ice Checking
Ice Ejection
Lock
Horizontal
Conditions
Level Retrun
Conditions
<Timing Chart During Ice Ejection>
2-5 Test Function
1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic
ice maker. The test function starts when the test switch is pressed for more than 0.5 second.
2. Test button does not work during ice ejection and water supply. It works when it is in the horizontal conditions. If mould is
full of ice during test function operation, ice ejection control and water supply control do not work.
3. When test switch is pressed for more than 0.5 second in the horizontal conditions, ice ejection starts irrespect of the
mould conditions. Water shall be splashed if test switch is pressed before the water in the mould freezes. Water shall be
supplied while the mould returns to the horizontal conditions after ice ejection. Therefore the problems of ice ejection,
returning to the horizontal conditions, and water supply can be checked by test switch. When test function performs
normally, buzzer sounds and water supply shall carry out. Check it for repair if buzzer does not sound.
supplied while the mould returns to the horizontal conditions after ice ejection. Therefore the problems of ice ejection,
returning to the horizontal conditions, and water supply can be checked by test switch. When test function performs
normally, buzzer sounds and water supply shall carry out. Check it for repair if buzzer does not sound.
4. When water supply is completed, the cycle operates normally as follows: Ice making
→
Ice ejection
→
Returning to
horizontal conditions
→
Water supply
5. Remove ice from the ice maker cube mould and press test switch when ice maker cube mould is full of ice as ice ejection
and water supply control do not work when cube mould is full of ice.
2-6. Other functions relating to freezer compartment door opening
1. When freezer door is open, ice dispenser stops in order to reduce noise and ice drop.
2. When freezer door is open during ice ejection and cube mould returning to horizontal condition, ice ejection and cube
mould level return proceed.
3. When freezer door is open, geared motor and cube ice solenoid immediately stop and duct door solenoid stops after 5
seconds.
4. Water dispenser stops in order to protect water drop when freezer door is open.
5. Test function operates normally irrespect of refrigearator compartment door opening.
ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
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