At Power On; Colour Change Operation; Pen Exchange Operation; Block Diagram - Sharp mz-800 Technical Reference And User's Manual

11-2 Block diagram
H
I
\
Intelligent
-I
I
,
Can-
nectar
Buffer
interfacing
I - -
I
~
LSI
\
...
r-.
Control switches
{Paper feed
Reset
Pen exchange
11-3 At power on
At power on, more than 5V of pen up current is applied
for a period of 1 Oms, 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 a_t 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.
11-4 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 undirectionai rotation at the
left end of the X-axis, and is locked within prointable
range, care must be exerted not to touch the rotor and
the slider;
.......--
-
_l
,.__
H
Y-axi$
\
stepping
~
r--"1
motor
I
Drive array
I
,
-
k
X-axis
r-1
stepping
-
motor
I
~
-
~ Pen up/
Magnet
dawn
drive circuit 7
magnet
I
L_
I
__ j
Printer mechan ism
11-5 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.
Motor phase and rotating direction
The arrow head indicates the forward direction for both
the X-axis and Y-axis.
36