HEIDENHAIN TNC151B Service Instructions Manual page 49

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DR. JOHANNES HElDENHAlN GmbH
D-8225 Traunreut 'Tel. (08669) 31-O
SERVICE MANUAL TNC 151/155
Paae 39
Kundendienat
Se&ion 3.1.3
3.1.3 Procedure for exchanging the PLC I/O Board
of the PL 100 B/110
1. Remove the fixing screws of the heatsink cover-plate.
2. Remove the heatsink cover-plate.
3. Disconnect the TNC 151/155 connecting cable.
4. Disconnect connector strips 51-39, using a screw driver
to psise the connectors apart.
(Do not unscrew individual wires)
5. Remove the voltage supply (+24V and OV)
6. Remove the fixing screws of the PL 100 B/110 B unit.
7. Install the new unit following the above procedure in
reverse order.