Samsung ACH2400C Service Manual page 29

Trouble Shooting
EC08 : When the reverse of three phase power is found.
Check point :
- Check CN76 to connect correctly.
- Check IC51, IC52, IC53 to connect correctly.
Check the Mis-insertion on CN76?
Wire shorted?
Check the pin no 4 of IC51, IC52, IC53,
does this make round type signal?
IC correct
Take two connected lines to change the string of
L1, L2, L3 because of the reverse of power.
28
NO
NO
YES
YES
Insert correctly
YES
Replace IC that does not
make round type signal
Replace wire