DOWNLOAD LG GR-349SQF Service Manual ↓ Size: 6.37 MB | Pages: 44 in PDF or view online for FREE

Model
GR-349SQF
Pages
44
Size
6.37 MB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
gr-349sqf.zip
Date

LG GR-349SQF Service Manual ▷ View online

- 37 -
136E
136E
136F
155A
140A
151A
151B
241A
235A
249C
241A
249A
237A
241C
136A
125A
136B
136C
136D
233A
231A
210A
210A
249B
230A
203A
201A
200A
281D
OPTIONAL
NOTCH
TEMP(˚C)
ROOM
Min
Min/
Mid
Mid
Mid/
Max
Max
-15
-16.5
-18
-19.5 
FREEZER
VACATION
FREEZE TEMP
QUICK FREEZE
-22
This description is made for GR-349, 389SQ. Please refer to overall PCB circuits for other models.
1 FUNCTION EXPOSITION
1) FUNCTION
(1) The refrigerator starts from optimum condition when electric power is first on. But the operation condition changes "Mid"
"Mid/Max" 
"Max" 
"Min" 
"Min/Mid" 
"Mid" whenever pressing the FREEZE TEMP button.
(2) It returns to "Mid" conditions if power off and on again.
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
- 17 -
2) QUICK FREEZER
(1) Function to raise the freezing speed by operating the COMP successively. As pressing the QUICK FREEZE button, the
QUICK FREEZE LED is displayed. Then after 3 hours' successive operation of COMP, the QUICK FREEZING function
will be released.
(2) Defrosting During the QUICK FREEZING operates as follow.
When the QUICK FREEZING time is below 90 minutes, defrost and then operate the QUICK FREEZING for the
remaining time. When the QUICK FREEZING time is over 90 minutes, defrost and then operate the QUICK FREEZING
for 2 hours
(3) If QUICK FREEZE button is pressed during defrosting, the QUICK FREEZE LED is lit up. But the QUICK FREEZING
operates for 3 hours after 7 minutes from the end of defrosting.
(4) If VACATION button is pressed during the QUICK FREEZING, the QUICK FREEZING LED function is released.
(5) If power off during the QUICK FREEZING and power on again, the QUICK FREEZING function is released.
3) VACATION FUNCTION
(1) Function for Energy Saving. As pressing the VACATION button, the VACATION LED is displayed and this function is
operated.
(2) Freezer Compartment is not kept by compressor at the notch displayed but at -13
°
C
±
differential.
(3) Defrosting and Fan control is same as normal operation.
(4) If QUICK FREEZE button is pressed during the VACATION FUNCTION, VACATION FUNCTION is released.
(5) If power off during the VACATION FUNCTION and power on again, the VACATION FUNCTION is released.
4) DOOR OPENING ALARM
(1) When the REFRIGERATOR DOOR is opened and won't be closed after 1 minute from the its opened, BUZZER sounds
to notify it.
(2) At frist, BUZZER sounds three times at each intervals of 0.5 second. Then makes a 0.5 second ON/OFF alarm three
times at intervals of 30 seconds.
(3) If the REFRIGERATOR door closed during ALARM, it is released.
5) DISPLAY BUTTON RING
(1) If display function button(FREEZE TEMP, QUICK FREEZE, VACATION) of the front of the TOP COVER is pushed,
BUZZER rings with "DING~ DONG~"(See the BUZZER OPERATION CHECK)
6) DEFROSTING
(1) If the accumulated time for the operation of the COMPRESSOR is meet with 7 hours, the DEFROSTING HEATER is
started.
(2) The first defrosting is performed at 4 hours(compressor ON) later since the power is on.
(3) If DEFROST SENSOR is over 7
°
C during DEFROSTING, end the operation of DEFROSTING with DEFROSTING
HEATER paused, And after 7 minutes, the operation for the freezing is started.
But, if DEFROST SENSOR is not reach to 7
°
C after 2 hours' operation of the defrosting heater, it represents a defrosting
trouble.(See the TROUBLE REPRESENTING FUNCTION)
(4) If DEFROST SENSOR is short or open, defrosting is not performed.
7) ORDERLY OPERATION OF ELECTRIC PARTS
To avoid NOISE and DAMAGE, the items containing an electric parts such as COMP, DEFROSTING HEATER and FAN
MOTOR operate in order as follows.
- 18 -
CLOSE
OPEN
CLOSE
OPEN
CLOSE
BUZZER
within
1 minute
1 minute
30
seconds
30
seconds
three
times
three
times
three
times
FREEZER
DOOR
OPERATION STATE
OPERATION ORDER
WHEN DEFROST SENSOR
TEMPERATURE IS OVER
7
°
C. (WHEN PURCHASING 
OR MOVING)
WHEN DEFROST SENSOR 
TEMPERATURE IS BELOW
7
°
C. (WHEN POWER  
FAILURE OR SERVICING)
WHEN RETURNING TO NORMAL
STATE FROM TEST MODE
POWER
COMP
FAN
ON
ON
ON
after 0.5 sec.
after 0.5 sec.
All Elec. Parts
COMP
FAN
OFF
ON
ON
after 7 min .
after 0.5 sec.
POWER
DEFROSTING
DEFROSTING
ON
HEATER ON
HEATER ON
after 0.5 sec.
after 10 sec.
COMP
FAN
ON
ON
after 0.5 sec.
after 0.5 sec.
WHEN PLUGGED A
T
 FIRST
8) SELF-TEST
(1) Function to make service easy in case of occuring a trouble in the product.
(2) When occurring a trouble, if the button is pushed, but the function could not operate.
(3) If a toruble release during the representation of trouble, a refrigerator performs the normal function(RESET).
(4) To represent a ERROR CODE, it use FREEZE TEMP LEDs on TOP COVER. If ERROR occurs, the other LEDs except
ERROR CODE LEDs are all off.
ERROR CODE LEDs
OPERATION IN TROUBLE'S OCCURRING
NO.
ITEMS
F1    F2    F3    F4
DESCRIPTION
COMP
FAN
DEFROST HEATER
1
FREEZER
FREEZER SENSOR open 
SENSOR abnormal
or short.
O
O
2
DEFROST
DEFROST SENSOR open 
SENSOR abnormal
or short.
O
O
No defrosting
3
DEFROSTING
DEFROST HEATER, 
FUNCTION
TEMP. FUSE open or
is abnormal
disconnection (Displayed 
after at least 4 hours 
O
O
O
from the trouble's
occurring.)
4
RT-SENSOR NOTE 
1)
Room Temperature
abnormal
SENSOR open or short 
O
O
O
- 19 -
VACATION
FREEZE TEMP
QUICK FREEZE
F1
ERROR CODE LEDs
F2
F3
F4
15 minutes On/
15 minutes Off
NOTE 1) If one second pass after pressing the QUICK FREEZE and FREEZE TEMP buttons togather in normal
operation, operates as follow.  
If normal, LEDs on the TOP COVER is all on. 
If abnormal, LEDs are all on except VACATION LED.
RT-SENSOR
:ON
O : OPERATE NORMAL
:OFF
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