Samsung WF806U4SA series - Page 26

24 _ Disassembly and Reassembly
Part Figure Description
Replacement of the
main PCB
1.Removethebackcoverandunfastenthe
screwsthatholdthemainPCBinplace
2. RemovethePCBcoverinside.
Removethewireharnessconnectorwhich
isconnectedtothePCB.
3. ReplacethemainPCB.
 YoucannotremovethePCBseparately
becauseurethaneisusedforwater
proong.
4
 CheckPointsforTroubleshooting
1. Checkwhetherthereisanyerrorinapplyingthepower.
2. CheckthevoltagebetweentheDC5VandGNDterminals.
3. Ifanerroroccurswhenthereisnocharacteristicerrorintheelectricharnesses,check
thesepoints:
HE/HE1error:Theresistanceofheater(for1900Wunit)is27Ω
DE1error:Theresistanceofdoorswitchis140to145Ω
HE/HE1error:Theresistanceofthermostatis0Ω
4Eerror:Theresistanceofwatervalveis4.4kΩ
 Reassemblyisinthereverseorderoftheremoval.