LG F74A8QDS Service Manual ▷ View online
20
PCB Layout (Main)
Earth Wire Connector
20
Before servicing ask the customer what the trouble is.
Check the adjustments. (Power supply :220-240V~, Removal of transit bolts etc..)
Check the troubles referring to the troubleshooting.
Decide service steps referring to disassembly instructions.
Then, service and repair.
After servicing, operate the appliance to see whether it works OK or NOT.
Check the adjustments. (Power supply :220-240V~, Removal of transit bolts etc..)
Check the troubles referring to the troubleshooting.
Decide service steps referring to disassembly instructions.
Then, service and repair.
After servicing, operate the appliance to see whether it works OK or NOT.
7. TROUBLESHOOTING
7-1. CHECK BEFORE SERVICE
7-2. LOAD TEST MODE
1 Touch and Hold ‘
Option (2)
’ & ‘
Rinse
’ buttons
and then press ‘
Power
’ button.
2 The washer must be empty and the controls must be in the off state.
3 Press Power with above two buttons pressed and then buzzer will sound.
4 Press the Start/Pause button repeatedly to cycle through the test modes
F1495BDS(1~9), F1495BD(1~9)
1
2
3
4
5
6
2
3
4
5
6
Display Status
Remark
Check Point
Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Turns on all light and locks the door.
Tumble clockwise
Low speed spin
High speed spin
Inlet valve for prewash turns on.
Inlet valve for main wash turns on.
Inlet valve for hot water turns on.
Inlet valve for steam turns on.
Tumble counterclockwise
Heater turns on for 3 sec.
Circulation pump turns on.
Drain pump turns on.
Sensor for steam
Steam heater turns on for 1.2 sec.
Off
PGM Version Information
rpm(42~50)
rpm (60)
rpm (130~140)
Water level frequency
Water level frequency
Water level frequency
Water level frequency
rpm
Water temperature
Water level frequency
Water level frequency
Water level frequency
AG Temperature
-
For Hot&Cold Model
For Steam Model
For Steam Model
For Steam Model
21
7-3. HOW TO CHECK THE WATER LEVEL FREQUENCY
7-4. HOW TO CHECK THE TEMPERATURE OF EACH THERMISTOR
AT OPERATING CONDITION.
040
045
000
100
021
041
045
097
000
045
112
000
248
084
000
026
145
000
The digits indicate the water level frequency.
For example, if 255 is displayed
the water level frequency is 25.5kHz (255 X 0.1).
For example, if 255 is displayed
the water level frequency is 25.5kHz (255 X 0.1).
Data View Type : In case of ‘040’
Touch the
Temp.
and
Pre Wash
button simultaneously.
If the knob is turned, the data view type is changed from 40 to 49
Touch the
Temp.
and
Pre Wash
button simultaneously.
If the knob is turned, the data view type is changed from 40 to 49
040
045
000
100
021
041
045
097
000
045
112
000
248
036
000
026
145
000
Thermistor in tub temperature
Data View Type : In case of ‘040’
22
Key
Key
Knob
Pre Wash
Temp.
Reference to check the vibration sensor
error
error
1. Range of vibraiton sensor data has to
change between 1900 and 2100 when
stopping the motor.
2. When the washer is in spin mode, if the
vibration sensor data doesn’t change
and keeps the static value, disconnection
or noise effect is suspected.
3. In case of over-range, we also need to
check the status of vibration sensor.
1) Data View Type : Touch and Hold Pre Wash and Temp key simultaneously, and then turn the knob
until it display ‘043’.
2) Vibration Sensor Data = Vib_Sensor X-axis_01 x 100 + Vib_Sensor X-axis_02
3) Vibration Sensor status : If it displays ‘000’, normal, ‘001’, incorrect initial position of vibration sensor
or offset error, ‘002’, disconnection of vibration sensor.
Display Data View Mode
Y-axis_01
Y-axis_02
X-axis_01
X-axis_02
1)
043 Vib_Sensor XXX
XXX
Vib_Sensor
XXX
XXX XXX
XXX
XXX XXX
XXX
2)
Vib_Sensor XXX
3)
XXX
Vib_Sensor XXX
XXX
7-5 HOW TO CHECK THE VIBRATION SENSOR
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