HEIDENHAIN TNC 306 Service Manual - Manual (Page 103)

SERVICE MANUAL TNC 306/360
Page 96
HEIDENHAIN Service
19.4 Exchanging the PLC Board
19.4.1 MOS-Protection and Labelling of the Cables (see section 19.1)
19.4.2 Dismounting the PLC Board
a) Switch off the main switch at the machine tool
b) Loosen the plug connections and clamped joints at the PLC board (X21 to X27).
Pin layout: see section 6
c) Loosen the screws
d) Loosen internal plug connections