Sharp MZ-700 manual Micro COlOR Graphic Printer

7.MICRO COlOR GRAPHIC PRINTER

MZ-700

7-1 Micro color graphic printer

1) Block diagram

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Con-Buffer nectar

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Intelligent

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interfacing

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LSI

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Control switches

{paper feed Reset

Pen exchange

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Drive array

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"Magnet drive circuit

		.....--			-
I--		~ V-axis
I--				stepping
				motor
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I -- l-l.
			X-axis
I -- ~				stepping
			motor'
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~Pen up/

downI

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"7	magnet
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Printer mechan ism

(1) At power on

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.

(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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