Power Led - Radio Shack TRS-80 MICRO Hardware Manual

Computer system
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Other
Controls
and
Indicator
POWER
LED
Lights
up
when
the Printer
is
on.
ON
LINE/OFF LINE
Set
to
ON
LINE
to
make
the Printer ready
to
accept
'data
from
the
Computer.
Set
to
OFF
LINE
to
stop
receiving data
from
the
Computer.
PITCH
Selects the printing
pitch.
At
10 the
pitch
is
set for
10
characters/inch (1/10").
At
12 the pitch
is
set for
12
characters/inch (1/12").
At PS
the spacing
is
propor-
tional to
the
space
allotted for
each
character
as
it
is
printed (See
pages
25, 26, 27).
When
you
use
the Courierfont,
use
the 10 pitch
setting.
The
Prestige
Elite
font
should be used
with 12
pitch.
Madeline
requires the
PS
(Proportional Spacing)
position.
Caution:
Do
not
accidentally
bump
pitch
switch
setting
while
running
a
program
or operating
the
printer.
Unless
pitch
has
been
selected/changed
under
software
control, the
pitch
switch
remains
active.
Once
pitch
has
been changed
via
software, the
pitch
switch
is
no
longer
effective, to
manually
select pitch,
the printer
has
to
be turned
off
and
then back
on.
Warning:
The
"ribbon-out"
sensor switch
is
inactive
when
the
printer
is
off-line in a
self-
test
mode.
Thus,
if
the
ribbon should run out while the
printer
is
in this
mode,
the
rib-
bon
may
break.
If this
should happen,
turn off the printer
and
carefully
replace the
cartridge.
Notes
regarding ribbon out
error condition
When
the
printer
is
in a
normal
printing
mode,
if
the
ribbon runs
out,
the
print
head
will
stop.
With
a
model
I
system,
replace the ribbon, close the
cover
and
the
printer
will
resume
printing
without
loss
or insertion
of
data.
With
a
model
II
system,
you
will
have
to
type
continue
(after
replacing the
ribbon)
and
then
the
printer
will
continue
printing
from
the
stopped
head
position.
However, you
should be aware
that
the entire current
line will
be
restarted
from
this
location,
therefore there
may
be
some
printing duplication
at this
stopped
line.
15
-

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