(
(
(
Attachment
of
a
TV
Monitor
A standard TV set may
be
modified and used
as
a video
monitor
for
the 5100.
Generally, modifying a standard TV set and using
it
as a
video monitor yields less satisfactory results than using
a regular video monitor. This is because the same level
of
quality is not built into TV receivers
as
is found in
monitor class units. For example, the contrast and
resolution are not
as
good on a modified TV receiver;
thus the image is
not
as
sharp and is usually more
difficult
to
read.
However,
if
a TV receiver is modified and used
as
a
video monitor, the following procedure must be
observed, or exposure
to
a severe electric shock or
damage
to
the 5100 may occur when the TV set is
connected
to
the IBM 5100.
Three-Prong
Grounded
Plug
A modified TV set must have isolation between the
primary line voltage and the frame and circuitry
of
the
set. This can be accomplished by using
an
isolation
transformer between your outlet line voltage and the
voltage input
to
the TV set. This transformer should be
permanently wired into the circuit. The new input power
plug must be a three-prong grounded plug with the
ground connected
to
the chassis
of
the TV set. This
grounding circuit must be electrically connected
to
the
5100 grounding circuit.
Before the video input is connected
to
anything,
it
should
be
tested
to
verify that the connector's external
shell is at ground potential and that no line voltage is
present on either the external shell or the center
conductor.
It
is
the responsibility
of
the TV modifier
to
ensure that
the input circuit meets the requirements
of
the 5100
output and will not damage the 5100. IBM will not
modify the TV receiver.
Isolation
Transformer
TV
Output
Note:
If
a TV receiver is modified
for
use
as
a video
monitor, IBM accepts no responsibility
for
safety
precautions during conversion and hookup,
for
damages
incurred
to
the TV receiver or 5100, or
for
the quality
of
the TV receiver
as
a video monitor.
Intermittent Failures Troubleshooting Guide 3-97
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