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HCIIJCNHRIN
DR. JOHANNES
HEIDENHAIN
GmbH
D-8225
Traunreut
'Tel. (08669)
31-O
Kundendienst
SERVICE
MANUAL TNC 151/X5
Page
43
Section
3.2
Exchanging
the
Keypad
Board:
.Remove
the
6 cross-head
fixing
screws
from
the
frontplate.
.Tilt
the
frontplate
outwards.
.Remove
connectors
J13
(feedrate-override
potentiometer)
and
J14
(spindle-override
potentiometer)
from
the
Connector
Board.
.Remove
the
ribbon
cable
connector
PlO
from
the
Keypad
Board.
.Remove
the
7 cross-head
fixing
screws
which
secure
the
Key-
pad
Board
to
the
frontplate.
.Pull
off
the
Keypad
connectors,
Pl
to
P8 respectively
P9 for
the
TNC 155
from
the
Keypad
Board.
.Remove
the
Keypad
Board.
When
rebuilding
the
assembly,
ensure
that
the
keypad
connec-
tars
are
firmly
engaged
in
their
respective
sockets,
and
that
the
LEDs project
through
the
corresponding
bored
holes
in
the
keypad
housing.
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