DOWNLOAD LG GR-267 Service Manual ↓ Size: 22.52 MB | Pages: 127 in PDF or view online for FREE

* Lead Check Function: If both freezer temperature control button and power freeze button are pressed at the same time for

more than one second, all LEDs in control display are on and return to its previous normal conditions when buttons are
released.

* Freezer Fan RPM Variable Check: In case of freezer fan is in operation, when both freezer temperature control button and

power freeze button are pressed for more than one second at the same time, freezer fan RPM changes from high speed to
normal speed for thirty seconds. After thirty seconds, it returns to its original RPM. Freezer fan motor does not require
twenty seconds delay. 

1. It is possible to get ice and water without opening the refrigerator door.

2. Ice or water will be dispensed when dispenser switch (rubber button) is pressed after selecting ice (cube or crushed) or

water. If ice is selected, duct door will open by duct door solenoid when dispenser press switch is pressed. Duct door
shall be closed five seconds after press switch is released.

3. Ice and water shall not be dispensed when refrigerator door is open.

4. Geared motor and solenoid (cube and water) shall be automatically off if there is no off signals in three minutes after

dispenser switch is pressed. Solenoid (duct door) shall stop five seconds after it is off. (to prevent coil cut due to solenoid
overheating)

5. Dispenser Lamp On/Off Functions

Dispenser lamp shall be on and off when dispenser press switch is pressed and released respectively. 

6. Water/Crushed Ice/Ice Cube selection functions

1) Water/Crushed Ice/Ice Cube shall be selected by user in the control display and indicated in the display by pressing

selection button.

2) When power is first on, crushed ice is automatically selected.
3) If crushed ice is selected and there is ice in the ice bank, geared motor shall operate to dispense crushed ice when

dispenser switch is pressed.

4) If Ice Cube is selected and there is ice in the ice bank, geared motor and ice solenoid shall operate to dispense 

Ice Cube when dispenser press switch is pressed.

7. Water Dispenser Functions

1) If user selects water in the control display, LED is indicated and selected.
2) As water dispenser is directly connected to the water tap, water shall be supplied by opening water solenoid valve

which is fixed at right side of machine room when user select water in the control display and press dispenser press
switch. 

- 35 -

Electric power circuit is composed of Sub PWB which reduces noise and SMPS (Switching Mode Power Supply). SMPS
consists of rectifier (BD1,CE1) which converts AC voltage to DC voltage, switching parts (IC11) which switches the rectified
DC voltage, trans parts which transmit, energy from the primary to the secondary, secondary electric power which supplies
electricity to MICOM and IC, and feed back parts (IC10, IC12) which feed back to the primary trans in order to maintain
constant secondary voltage.

• High voltage (DC 310V) is maintained at electric power terminals. Unplug power cord from the outlet and wait for

three minutes before taking measures if power circuit is wrong. Be care of electric shock.

This circuit is for clock generation for synchronizing transmission and reception of information of internal logic element of
IC1 (MICOM). Use standard oscillation when oscillation spec is changed as time calculated by IC1 changes or can not work. 

This is the circuit by which all functions start from the initial conditions by initializing many parts such as RAM in the MICOM
when electricity is first on or electricity is reapplied to MICOM by momentary power cut. Low voltage is applied to the reset
terminal of MICOM for 10ms when electricity is first applied. Reset terminal is 5 voltage for general operation. (MICOM does
not operate when reset IC is fault.)

- 36 -

+

+

+

POWER

CON1

IC1

(MICOM)

TRANS 10,11

R1

R4

R3
4.7K

D3
FR104

F2

1K

R5

4.3/1W

4

5

4

7.8

1

2

2

5

3

4

F1

3

2

BD1

D3SBA60

R11

560K

1/2W

D2

FR104

D1

FR107

D4

FR302

1.5K
R8

R6 1.8K

IC10

TLP721

IC12

KIA431

CC7

102

/50V

R10

2.4K

R7

9.1KF

R9

15K

CN5

223/100

CE2

47uF

/50V

CE3

2200uF

/25V

CE1

82uF

/450V

CN3

473

/630V

R2

56K
/2W

CC1

102

330K/1W

VA1

SVC471

D14A

VDD
Varef

6
5
4
3
2
1

IC11

STR

F6553

CC5

221/2KV

CC6

221/2KV

7805

IC2

CC2

104

CC3

104

CC4

104

64

55

32

54

26

TEST

VASS

VSS

CC29

104

CE5

220uF

/16V

CE6

220uF

/16V

+

+

IC 1

(MICOM)

XOUT

XIN

30

R67

1M

OSC1

CST4.00MGW

31

KIA7042P

IC1

(MICOM)

CC11

104

2

R16

100

R18

1K

1

IC3

RESET

29

R17

4.7K

+

CE11

10uF

/50V

CC12

104

* Freezer fan motor stops operation when freezer or refrigerator door is open. But it works when refrigerator door is closed.

*  A  B  C  D  of freezer and refrigerator door switch are switch ends which detect door opening and are connected to door

opening sensor circuit.

* Home Bar door switch is connected to the refrigerator door switch  C  D  in parallel. It can detect if one of these doors is

open.

- 37 -

Freezer 

COMP Machine

Defrost

AC Convertible

Refrigerator

Electronic

Chilled Drawer

Fan Motor

Load Types

Room Fan

Heater

Relay

LAMP

Single

Duct Heater

High

Standard

Motor Damper

Speed Speed

Measuring Point(IC 4)

No.10

No.11

No.12

No.13

No.14

No.15

No.16 IC5-10

Conditions

ON

Below 1V

OFF

12V

MACHINE ROOM

DEFROST

HOME BAR

DOOR

SWITCH

R-DOOR SWITCH

(VEGETABLE DUCT)

F-DOOR SWITCH

- 38 -

LOAD TYPE

GEARED

SOLENOID

WATER VALVE

SOLENOID

HOME BAR

MOTOR

CUBE

ICE

WATER

DISPENSER

HEATER(option)

Measuring Point(IC 5)

No.11

No.12

No.13

No.14

No.15

No.16

Conditions

ON

Below 1V

OFF

12V

Measuring Point

Lever S/W

IC1(Micom) No. 45

On(Press)

OFF

5V

0V

(60Hz)

5V