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Kundendienst
caution:
.Please
observe
MOS protection
measures
when
exchang-
ing
boards.
.Exchange
boards
with
the
same
assembly
no.
only.
The assembly
no.
is
impressed
on every
board,
to
the
left
of
the
serial
no.
SERVICE
MANUAL TNC 151/155
Page
41
Section
3.2
Work
area
requirements
The TNC 151/155
contains
sub-assemblies
with
MOS elements.
Although
MOS ICs
are
equipped
with
an input
protection
diode
network
to
eliminate
the
build-up
of
static
charges,
care
must
be taken
when
handling
these
elements.
The
following
requirements
in
the
work
area
must
be met:
Prior
to
working
with
MOS components
or
with
assemblies
con-
taining
MOS elements,
all
table
coverings,
instruments,
tools,
and work
personnel
must
be properly
grounded.
A portable
"MOS-HANDLING-SET"
for
field
service
is
necessary
when
exchanging
the
operating
software
and/or
servicing
the
Control:
0
a conductive
work
surface
~. _
a wristband
that
provides
an electrical
connection
between
person
and conductiye
work
surface
a cable
that
equalizes
potential
differenc&
/_
0~
b&mm
,cronductive
work
wface
and
ground
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