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llCllJCNll/ilN
DR JOHANNES
HElDENHAlN
GmbH
D-i225
Traunreut
Tel. (08669)
31-O
Kundendienst
SERVICE MANUAL TNC 151/155
Page 44
Section
3.2
Exchanging
the Power Supply Unit:
.Rmove
the 4 cross-head
mounting
screws from the rear
of the
Control
(2 screws are found in the connector
box).
.Re!nove the back wall
with the Power Supply Unit
and Terminal
Board.
.Disconnect
the ribbon
cable
connector,
Pl, from the Connector
Board
(see diagram).
.Remove the voltage
supply plug,
PZ, from the Connector
Board
(see diagram).
Exchanging
the Connector
Board:
.Remove the 2 cross-head
fixing
screws of the V-24 connector
on the rear
of the Control.
.Push the V-24 socket through
its
recess in the Control
housing.
.Unsolder
the connectors
to the WU socket
from the Connec-
tor Board (solder
terminals
1,4,5,6,7,8,10).
Note the colour
of the wire
connected
to each terminal.
.Pull
the Connector
Board from the front
of the Control
hous-
ing.
PI
J
L
P2
111
113 114
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