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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