Sharp MZ-700 Personal Computer User Manual


 
7. MICRO
COlOR
GRAPHIC PRINTER
7-1
Micro color graphic printer
1) Block diagram
H
H
Con-
Buffer
nectar
~
rr-
(1) At power on
/
I'
\
,
Intelligent
J
interfacing
LSI
~
I"'-
Control switches
{paper feed
Reset
Pen exchange
At power on, more than
SV
of
pen up current
is
applied
for a period
of
IOms,
plus 5 and minus
Oms,
to move the
carriage 556 steps backward on the
X-axis
in order to
initialize the colour position.
As
the carriage
is
held at the
left margin after disengagement
of
the motor, it
is
then
moved 30 steps forward on the
X-axis,
then stepped back
30 steps
again
to check
if
the colour position detector
has been made.
If
not, it continues to move the carriage
30 steps forward on the
X-axis,
then return 30 steps to
ensure the made condition.
(2) Colour change operation
To change colour, the slider makes three reciprocating
movements
of
6mm (30 steps) at the left end
of
the
X-axis
to move the pen position one step.
When
the desired pen
position
is
attained,
it
then returns to the home position.
Since the pen rotor makes a unidirectional rotation at
the left end
of
the
X-axis,
and
is
locked within printable
range, care must be exerted not to touch the rotor and
the slider.
20
MZ-700
.....--
-
\
I--
~
V-axis
,
I--
stepping
motor
J
Drive array I
l-l.
I--
X-axis
~
stepping
I--
motor'
I
~
Pen
up/
"
Magnet
down
drive circuit
"7
magnet
I
L_
I
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Printer mechan
ism
(3) Pen exchange operation
A pen needs to be exchanged with a fresh one when
it
runs out
of
ink. In such
an
event, the pen
is
moved 485
steps forward on the
X-axis
from the home position with
the used pen located on the top
of
the rotor, then take
out the used pen, by pressing the pen release
lever
and
exchange it with a fresh one.
(4) Motor phase and rotating direction
The arrow head indicates the forward direction for both the
X-axis
and
Y-axis.
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