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MAINTENANCE
llUllM,' I
_ _ _ _ _ _ _ _ _ _ ___._, IV
I
This section contains general servicing information
for
the
HP
30020B
Intelligent
Network
Processor
(INP).
This information
includes safety precautions, repair philosophy, maintenance aids,
use of the self-test capability, troubleshooting, and field-level
repair.
In this manual,
the
HP
3000
HP-IB
Version
Computer
System
refers
to the HP 3000 Series 30,33,40,44 and 64 Computer
Systems.
4-1. SAFETY PRECAUTIONS
Whenever the INP printed circuit assembly (PCA) is
installed
or
removed, ensure that the computer system's PROCESSOR power switch
is set to OFF.
Whenever the INP PCA is being connected or disconnected to a mod-
ern (by attaching or
removing
the
!NP-to-modem
interconnecting
cable),
ensure that the PROCESSOR power switch is set to OFF and
that the modem power is also turned off.
Be particularly cautious
when
selecting
the
routing
for
the
longer
lengths
of
the interconnecting data cables.
DO NOT run
these cables outdoors!
Lightning induced transients can
have
a
devastating effect on data communication links; and a more direct
lightning strike can, of course, be a very real safety hazard
to
personnel
as
well
as to the equipment.
Indoor routing must be
planned to avoid sources
of
electrical
"noise",
such
as
arc
welders.
Failure to observe these precautions could result
in
damage
to
the components of the computer system, the INP, and/or the modem.
L.
NOTE
It is important that you ground your-
self before touching
the INP-B board.
This is necessary to avoid any electro-
static discharge damage to the board.
Grounding
can be achieved by simply
touching the CPU frame.
4-1
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Troubleshooting
