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HEIDENHAIN
DR JOHANNES
HEIDENHAIN
GmbH
D-8225
Traunreut
.Tel (08669)31-O
SERVICE
MANUAL TNC 151/155
Page
14
Kundendienst
Section
2.2.3
2.2.3
Testing
of the
VDU and associated
circuitry
The first
objective
is
to determine
wether
the
fault
is
actually
with
the
Display
Unit,
in which
case
it
must
be
returned
to DR JOHANNES
HEIDENHAIN
for
repair,
or whether
it
lies
elsewhere,
with
the
associated
circuitry,
in
which
case
repairs
may be possible
without
returning
the
unit.
Visual
Display
Units
BE 110 and BE 211 in
conjunction
with
TNC 151
The Display
Units
BE 111 and BE 211 are
supplied
by an 11V
dc supply
from
the
Power
Supply
Board.
This
is
a possible
source
of
the
fault,
in which
case
the
test
and repair
pro-
cedure
continues
according
to
section
2.2.4,
Testing
of the
mains
supply
and the
Power
Supply
Unit.
If
the
fault
is
not
due to a detective
power
supply,
it
is
likely
to be due to the
CLP Processor
Board,
which
contains
the
control
circuitry
for
the
Display
Unit.
This
can be
verified
by exchanging
the
board
for
one is
known
to
function
correctly.
If
the
fault
still
persists
then
must
be due either
to bad
connections
within
the
TNC (eg on the
Connector
Board),
or
to faults
on both
the
VDU and the
CLP Processor
Board.
See the
diagram
opposite
for
a logical
procedure
for
locating
the
fault
in the
system.
: '
Testing
of
the
WU BE 111/211
and associated
circuitry
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