ABB DCT880 Service Manual page 25

− Temperature sensor (X22).
− Current transformers (X3, X4, X5).
8. Remove the SDCS-PIN-H board.
9. Remove the gate leads from the faulty thyristor module and mark the connectors clearly.
10. Remove the busbars and internal fuses (if existing) necessary to get full access to the faulty thyristor
module.
11. If a current transformer must be removed, mark its position, direction and the connections clearly.
Note:
Remove only as many parts as needed around the faulty thyristor module.
12. Remove the faulty thyristor module and mark it clearly as defective.
3ADW000449R0101 DCT880 Service Manual e a
Exchange thyristors sizes T1 ... T4
25