Sharp MZ-700 manual XTAL1 XTAL2, Int, Psen, Ale, Dbi, DB2, DB4

Page 22

2) Pen exchange method

To remove pen, press the pen exchange button, when the slider is at the right handside, push the pen release lever.

Motor

Push the pen release lever

To install the pen, push the tip of the pen through the ring of the return spring in the nrst place, then push into the holder. Upon completion, ensure that the tip of the pen is engaged with the hole of the pen return spring. If colour change is done when the pen is disengaged from the hole, it may cause improper rotation of the rotary holder as the slider makes contact with the pen. Do not try to rotate the rotary holder by hand when installing the pen during replacement of the pens.

The X-axis stepping motor and the Y-axis stepping motor are driven by the two-phase magnet.

Stepping motor driving signal

Basic drive pulse

 

 

n

 

n

 

 

n

 

 

 

 

 

 

 

 

 

 

Phase A

 

 

t ---

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Phase B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Phase C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Phase 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Motor clock

 

 

 

Hold period

 

 

 

 

 

 

 

 

 

 

 

 

~

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tMH

 

 

 

 

 

 

 

 

 

 

 

 

 

It is more effective to save power to shut off current while the X and Y axis motors are at a halt. But, there may be a possible malfuction because of unsuppressed vibration, if the current is turned off with a normal pulse width. In order to prevent this, current is applied excessively for more than the given hold time (tMH = 1ms or more).

Colour position detector

The colour position detector consists of a reed switch and a permanent magnet and it may cause malfunction owing to external vibration, and magnetic influence. Especially, when deposit of alien matter or paper frag- ments is between the left end of the carriage and the frame this may result in a failure of the colour detect performance.

Character set

Input of an undefmed code up to $20 is ignored. Other undefmed codes are represented in hexadecimal notation using the pen in a next color pOsition.

Pin configuration (top view)

TO

 

Vcc

XTAL1

 

T1

XTAL2

 

P27

RESET

 

P26

SS

 

P25

INT

 

P24

EA

 

P17

RD

 

P16

PSEN

 

P15

WR

 

P14

ALE

 

P13

DBo

 

P12

DBI

 

P11

DB2

 

P10

DB,

 

VDD

DB4

 

PROG

DBs

 

P23

DB,

 

P22

DB,

 

P21

Vss

 

P20

 

 

 

Pin Configuration

21

Image 22
Contents MZ-1TOl MZ-1POl 4KB RAM Video Counter ResetCPU RCBMZ-700 III System Description $7EODColr Ntpl LphiClkn PhioHBLK~ $OFFF $FFFF $DOOOOINH2 INH3 MonitorLPH1 ResetIN/OUT PHI~ P7 Memory Management Ntpl Gate VCC GND RDN Colr NtscLPH1 PAL ATB ATB CgromMotor PC· OUTVblnk Size AtrbName DtadrOUT2+----TO CPU INT SW3002 Iv1Z Forward PlaybackFast RewindAWl Vsync Csync VideoHsync CvideoMicro COlOR Graphic Printer Psen XTAL1 XTAL2INT ALEVDD Colour Plotter Printer Control LSIProg PI,B Power Supply ~ \ ~v1Z 70C 74LSOO74LS02 74LS147417 74LS166 74LS174 74LS176 Circuit Diagram & Parts Layout ~--l Ikop ThriI I I I 4O~- Back ~l--r ~-I-? VIiIT IPower unit FfO~ Lf j EI02IAC-33A ISi§====t============I~~=====~==~================~YD Page Parts List & Guide Rn CPU Unit Exteriors Rn CPU U~~t Exteriors ~18 IlJ CPU Unit Electronic Components 3J CPU Unit Electronic Components Power Supply Unit ID Power Supply Unit ~7~13 Ca ssette Unit Cassette Unit Cassette Unit MZ·700 Index Parts Code Parts Code Sharp