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llEllJ~NllAlN
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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