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Sharp MZ-800 Service Manual page 39

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3. OPERATION
3-1. Block diagram
H
\
\
Intelligent
H
j
,
Con-
nector
Buffer
interfacing
I - - -
J
r--
LSI
1\
,...
Control switches
{paper feed
Reset
Pen exchange
3-1-1. At power on
At power on, more than 5V of pen up current is applied
for a period of lOrns, plus 5 and minus Orns, 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.
3-1-2. 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.
38
MZ-800
,---
-
\
I--
~
V-axis
,
I--
stepping
motor
J
Drive array
I
~
.
I--
X-axis
stepping
I--
motor
,
~
Pen up!
~
........
Magnet
down
,
drive circu it
,.
magnet
,
L_
I
_J
Printer mechan ism
3-1-3. 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.
3-1-4. Motor phase and rotating direction
The arrow head indicates the forward direction for both the
X-axis and Y-axis.
~
c
BC
AD
BD

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