the next character printing, the
motor
will
move
11
steps
in
the
opposite direction.
The
ribbon
change
lever
A12
can
sense the type of ribbon
cassette.
If
a
normal
carbon
ribbon cassette is used, the
arm
of ribbon
change
lever
gets into a
opening
of the cassette
and
enables the
full
stroke of the
ribbon feed
arm
A6
for 4 teeth
on
the feed
wheel
AB.
In
the
meantime,
the multi-carbon ribbon cassette
has
no
opening
on
the referring section
it
pushes
the ribbon
change
lever,
so
that
the transport stroke will
be
1 tooth only.
3.15 Correction tape transport
and
lift
When
pressing the correction
key,
the information
from
the
keyboard
matrix is transmitted to the
CPU
(paragraph 3.03).
The
typewheel
motor
and
the ribbon
motor
are activated according to the 46-correction
memory
stored
in
the
RAM
range.
The
ribbon
motor
turns counterclockwise
30
steps =
225°
from
its
basic
position.
The
correct
cam
A13
lifts
the correct
arm
A14
at
the
end
of
the
movement.
At
the
same
time the correct feed
pawl
A15
feeds the
correct feed ratchet
A16
and
the correction tape is transported.
The
brake spring
A17
keeps
the correction tape tension at the correct tape
spool.
After the correction performed, the ribbon
motor
turns
back
to
its
home
position.
3.16
Paper
feed
L
If the
paper
bail shaft is pulled
forward
beyond
its
pressure
point for activating
of
the
paper
feed, the angle
of
right
paper bail
arm
closes the
first
contact S
10
of the
paper
feed
switch.
The
key
scanning
by
the
CPU
transmits H-level via the decoder
IC
5, connector 7 pin
1,
switch S
10,
buffer
IC
1 to the input
pin
17
of
CPU
(see paragraph 3.03).
Then
the horizontal
motor
activated
in
single function.
When
pulling the paper bail further forward, the
second
contact
is closed. H-level is transmitted via the
cone
7
pin
3, switch
S
11
buffer
IC
1 to the input
pin
19
of the
CPU.
Thus
the hori-
zontal
'motor
is activated
in
repeat function.
The
horizontal
motor
drives the platen via the drive gear, drive
pulley, drive
cog
belt
and
platen pulley.
The
index
key
(forward)
and
the reverse
index
key
(backward)
activates the corresponding platen
movement
via the contacts
on
the
keyboard
matrix.
15
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