8. Trouble Diagnosis
- As the micom wash machine is configured of the complicate structure, there might be the service call.
Below information is prepared for exact trouble diagnosis and suitable repair guide.
Caution for the Repair and Replacement
Please follow below instruction for the trouble diagnosis and parts replacement.
1) As some electronic components are damaged by the charged static electricity from the resin part of wash
machine or the human body, prepare the human body earth or remove the potential difference of the
human body and wash machine by contacting the power supply plug when the work contacting to PCB is
executed.
POWER SUPPLY PLUG
2) Since AC220~240V is applied to the triac T1 and T2 on P.C.B, the electric shock may occur by touching
and be careful that the strong and weak electricity are mixed.
3) As the P.C.B assembly is designed for no trouble, do not replace the P.C.B assembly by the wrong
diagnosis and follow the procedure of the trouble diagnosis when the micom is not operated normally.
14
8-1. Trouble Diagnosis
No Item Cause and treatment
- Is the PCB connector connected well?
- Is the voltage normal?
- Is the power supply plug connected well?
1 The power is not supplied
2 The water is not supplied.
The wash does not start though
3
the water supply is stopped.
- Is the noise filter connected well?
- Is the secondary output of the power supply transformation normal?
- Is the fuse disconnected? (option)
• If above points are not found, the PCB assembly is out of order.
Replace it.
- Is the knob open?
- Did you push START/PAUSE button after selecting the course?
- Is the water supply valve connected well?
- Is the winding of the water supply valve continuous?
- Is the connection and operation of the pressure switch normal?
• If above points are not found, the PCB assembly is out of order.
Replace it.
- Is the connection and operation of the pressure switch normal?
- Is the pressure switch hose damaged so that the air is leaked?
- Is the pressure switch hose bent?
- Check the operation of the water level switch.
• If above points are not found, the PCB assembly is out of order.
Replace it.
The drum does not rotate during
4
washing.
The drum rotates by one direction
5
during washing. (The drum rotates
to one direction for SPIN.)
6 Drainage problem.
7 Dehydration problem.
8 Abnormal noise during SPIN.
Leak breaker or current/leak
9
breaker is down during washing.
10 The heating is not executed.
- Is the belt connected well?
- Is the winding of the motor continuous?
(Rotor winding, stator winding, generator)
- Is the motor protector normal?
• If above points are not found, the PCB assembly is out of order.
Replace it.
- The PCB assembly is out of order. Replace it.
(Inversion relay open trouble)
- Is the drainage hose bent?
- Is the winding of the drainage pump continuous?
- Is the drain filter clogged by the waste?
• If above points are not found, the PCB assembly is out of order.
Replace it.
- The unbalance is detected.
- Put in the laundry uniformly and start again.
- Is the pulley nut loosen?
- Is the transport safety device removed?
- Is the product installed on the level and stable place?
(Little noise may be generated during the high-speed SPIN.)
<When the leak breaker and current breaker is installed separately>
- When the leak breaker is down, check and make the earth of the outlet.
- When the current is down, the current is leaked.
<Is the breaker down when the leak/current breaker is combined?>
- Check the rated capacity of the current and leak breaker.
The current breaker may be down due to the lack of the current when the
wash machine and other apparatus are used.
In this case, execute the cold water wash to check whether the current capacity is lack.
- Is the wash heater terminal unplugged?
- Is the wash heater normal?
- If above points are not found, the PCB assembly is out of order.
Replace it.
15
8-2 . Problem Checkking And Method Of Pcb
8-2-1 The Part Of Power Source
NO Power On
YES
The Voltage Of
BetweenⓐandⓑIs
As Big As 12V?
YES
NO
Check The Trans
The Voltage Of
Betweenⓒand
As Big As 12V?
YES
The Voltage Of
Betweenⓔand
As Big As 5V?
YES
ⓓ
ⓓ
NO
Is
Is
NO
Check The Diode(D16,17,18,19,
23) And Condenser(CE6)
Exchange TR14(KSD288) And
Check The Condenser(CE4)
16
8-2-2. Reset Part
The Value Of
Measurement Result Of
Between Micom 26 And
Gnd Is 5V?
Check IC3
YES
NO
Check The Power Source
8-2-3. Interrupt Part
Check The Curve
Output Of
Check The Micom
Number 11 ?
ⓐ
IC3
7042
?
R22
26
R23
CE2 1UF
Check D16 - D19
Check TR12, R41
Check The Part Of
Oscillator
ⓐ
C15
R44 2.2K
R41 4.7K
TR12 KSC815Y
11
C13
R45 C16
17
8-2-4. Checking The Part Of An Oscillator
When The Micom 27,28
Check, The Value Is
8Mhz?
YES
Exchange Micom And Check R25
NO
Check Resonator
RESO
8MHz
R25 1M
28
27
18
8-2-5. Driving Part Checking
◆
Confirm The Output Of DC5V, When The Every Part Of Micom Number Check,
According To The Some Problem Condition
ex) When The Drain Is Not Operating But Pump Motor Is Operating, Check
The 5Voltage Of Micom
Micom Number, 17 Is
5Voltage?
YES
The Part Of
ⓐ
Is
0 Voltage?
YES
Check R58, TRIAC2
NO
Micom Bad
NO
Check The IC 65003
MICOM
+12V
IC65003
ⓐ
TRIAC5
TRIAC3
TRIAC4
TRIAC2
※
Check The Micom 12th In The Above Method When The Cold Water Is Bad
R57
R60
R62
R58
ⓐ
ⓐ
ⓐ
POWER
DOOR
COLD
PRE
PUMP
37
16
182
38
17
19
8-2-6. Confirm The Driving Part Of Motor
Motor Is Not Spinning
NO
Motor Is Not Turnning
Right And Left
NO
Check The Tacho Part
YES
Check BD1, TRIAC1
YES
Check RELAY4
COIL2
CM2
R71
BD1
COIL1
CM1
RELAY4
R70
TRIAC1
12V
MICOM
IC 65003
R56
22
1W 300
15
D20
20
8-2-7. Checking The Tacho Part
Have The Motor Turn In Hand
Is The Rectangular
Curve In The Micom 8
,10th ?
YES
Exchange The Motor
R47 1K
R46
C17
TR11
NO
+5V
R40 4.7K
KSC815Y
Check The Surroundings
Circuit And TR11
MICOM
10
8
C12
21
9. Test Mode
Pre
Wash Rinse
Spin
Door
Child Lock
Lock
Sock wash
No Spin
Rinse+
Pre wash
Rinse Hold
Cotton
Synthetic
Hand Wash
Coloreds
Delicate
Quick
Spin
Rinse+Spin
Power
Delay
Temp
Spin
Child Lock
Option
Course
① ②
1. Driving Compartment Test Mode
A. Hold down “ 1” and “ 2” keys simultaneously and then press POWER S/W “ 4” on.
B. The driving compartment can be tested when you press “ 3” key right after entering
into the initial stage of the TEST MODE.
• Driving Compartment Test
COLD VALVE ON(0.3sec)→OFF(0.3sec)→RRE VALVE ON(0.3sec)
Pump MOTOR ON(0.3sec)→OFF(0.3sec)→MOTOR Left (0.5sec)→OFF(0.5 sec)
MOTOR Right (0.5sec)→OFF(0.3sec)→HEATER RELAY ON(0.3sec)→OFF(0.3sec)
OFF(0.3sec)
→
Start/Pause
③
→
④
→
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