Samsung WM1255AGS/XEN Service Manual page 36

Part Name
Exchangin
g the
Main PCB
①
②
②
③
④
Figure Method of Repair
1. Remove the four screws on the back.
2. Remove the Deco top L,R by pushing it backwards
from the front.
( → See the direction of the arrow)
Remove the four screws used to fix the Cover top.
Remove the two screws used to fix the Deco Front
L,R and the Cover Top.
Remove the Cover Top.
3. Remove the screw used to the fix the Bracket
PCB(M/U).
Remove the Cover PCB(M/U).
Separate the connector linked to the PCB.
Separate the Wire from the wire-fixing part of the
Cover PCB.
Separate the Reactor Wire.
4. Separate the three screws used to fix the Bracket
PCB from the Frame.
Raise the Bracket PCB upwards to release the fixing
hook.
Separate the PCB from the Frame.
Separate the screws used to fix the Main PCB /
Bracket PCB.
Exchange the Main PCB.
Check Trouble Points
1. Check whether the power permission is poor.
2. Check the voltage between DC 5 V and GND.
3. Check if other errors occured under the condition of
no abnormality in the electric field,
※ References
Error / Features of the electric field
Resistance value between 3E and Moter Phase
(U-V/V-W/W-U) : 15 Ω
Resistance value between HE/HE1 and the HEATER
(at 1900W) : 27 Ω
Resistance value between DE1 and the DOOR S/W
(1-2/2-3): 140~145 Ω
Resistance value between HE/HE1 and the
THERMOSTAT : 0 Ω
Resistance value between 5E and the PUMP : 400 Ω
Resistance value between 4E and the WATER
VALVE: 4.4 K Ω
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