Radio Shack TRS-80 Manual page 3

SETTING UP
Carefully
unpack the
Printer.
Be sure to locate
the ribbon, the
fuse,
and
the paper
tray.
Keep the
empty
box and insulation material
in
case
you
ever
need to transport
the printer.
Then remove
two
ties
holding
the paper
bail
to platen
turning
on
the povvef could
damage
the printer.
Ribbon
Replacement
(Refer to
Fig.
1
and
Fig. 2)
If
the ribbon
is
already
installed,
simply check to see that
it is
threaded
properly.
Compare
with
Fig.
10
If
the ribbon
cassette
is
not
installed,
or
if it is
necessary to replace the ribbon (fraying
or
faint printing
at
proper penetration
setting),
follow the instructions
below.
1.
Set
Power
switch to
OFF
position.
(Note that
when you
turn
power
off,
any information
stored
in
the printer's
buffer
will
automatically be
lost.
So avoid
this
situation
during
program
printing.)
2.
Open
printer
plastic
cover
and
move
Penetration Control lever fully
backward (away from
platen).
3.
Ribbon
is
in
cassette
which
is
held
down
at
lower
left
and
right sides
to the
cassette
holder
by
stop-
per
claws. Lift
up the platen
end
slightly
and remove by
lifting
up
the
entire cassette horizontally.
4.
Tension the ribbon
in
new
cassette
by
turning
its
knob
in
arrow
direction.
5.
Press
down
cassette until
firmly secured
by stopper claws.
Caution:
If
claws
fail
to
hook
on properly
when
cassette
is
pressed
down, the
cassette
knob
will'
not
fit
properly into shaft
from the
carriage.
Do
not
force cassette
down, but
fit
it
in
gradually while turning cassette
knob
in
arrow direction.
Insert
portion of ribbon extending out
from
cassette into print
head ribbon guide.
Manually
move
carriage
to
left
and
right
to
check
that
ribbon
feeds
out
properly.
Note:
Unless ribbon has
been
fitted
properly into print
head ribbon guide, printing
and ribbon feed
will
not operate smoothly.
Adjust Penetration Control Lever
in
accordance with instructions
in
section
of
"Paper Loading and
Penetration
Adjustment".
6.
7.
8.
Ribbon
Cassette
Print
Head
\
Ribbon
Cassette
Cassette
Knob
Stopper
Claw
Ribbon Guide
Shaft
Groove
Penetration
Control Lever
Paper
Empty
Switch
Arm
Front
Carriage
Guide
Rear Carriage
Guide
Figure
1
Figure
2