DR. JOHANNES HEIDENHAJN GmbH
D-8225 Traunreut ‘Tel. (08669) 31-O
SERVICE MANUAL TNC 151/155
Paw 42
Se&ion 3.2
Kundendienst
Exchanging the pluggable boards
Analog Board
Unscrew the 5 mounting screws and remove the housing cover.
Before removing the Analog/Analog TTL Board pull off and
Removing the boards:
mark the connector plugs for the measuring system inputs/
press the board ejector keys outwards and pull out the indi-
square wave signal inputs and the electronic handwheel input.
vidual board from the top.
The connector sockets on the board are coded with coding
pins.
Inserting the boards:
The connectors of the boards are coded: incorrect insertion
is therefore avoided. Press the board firmly into the Connec-
tor Board using the ejector keys tilted inwards.
Main Processor and CLP Processor/Graphics Board:
When exchanging these boards insert program EPROM's IC-Pl and
IC-P2 on the CLP Processor/Graphics Board and K-P3 to IC-P6 on
the Main Processor Board.
Main Processor Board:
During the exchange or removal of the Main Processor Board the
buffered RAN will no longer be supplied with voltage, which
means that the machine parameters and any user-programs will be
lost!
Before inserting the new Board plug in the relevant EPROMs
(EPROM IC-P3 to IC-P6), paying particular attention to their
correct location and orientation.
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