Radio Shack Modem I TRS-80 Owner's Manual page 13

When
Something Goes
Wrong
If
you have
trouble (garbled data, intermittent
errors,
etc.),
check
for the
following:
1.
The phone
connection should be
clean
and
noise-free.
2.
There should be no one
talking
on
the
telephone
line.
3.
The phone
and
all
extension phones should be on-the-hook.
4.
The
baud
rate
of
the terminal should be
less
than
or equal
to
300.
Troubleshooting
Chart
Symptom
Problem/Solution
Carrier
Detect
light off
AC
Adapter
is
not plugged
in;
plug
in.
Telephone
connections;
check
connections
and
refer to
the
Installation section.
mode
switch
is
not
in
proper
position; refer to the
General Operation
section.
Modem
at
other
end
is
not compatible;
modem
should
be a
Bell
103
or equivalent.
Garbled Display
Phone
not
hung
up;
hang up
phone.
Communications
protocol
may
be
set incorrectly
(baud
rate,
word
length,
parity,
stop
bits);
check and change
if
necessary.
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