Sharp MZ-700 manual SW3002

5.DATA RECORDER

5-1. Data recorder (MZ-lT01)

Data transfer with the recorder is carried out via the 8255. The read data is sent out through the port Cl and the write data is received through the port C5. The motor on/off control is carried out via the port C3 and that activation of the motor is confmned through the port C4. The signal SENSE goes low when FF, REW, or PLAY pushbutton is pushed on the MZ-} TO I.

• Cassette specification

	Method	PWM recording method
Rated power		5V ± O.25V
		Wait:	2mA
Rated current		Record:	210mA (TEAC TEST TAPE)
		Playback: 150mA (TEAC TEST TAPE)
		Transistor x 5
Semiconductors used		IC x 2
		Diode x4
Tape used		C30 - C90
Rated tape speed		4.75cm/sec
Tracks		2 tracks, monoral
Motor		5V electronic governor motor
Bias		DC
Erasure		DC
Standard playback point		lmsec -	500 sec
Nominal input		L: O.4V, max.
level and		H: 2.0V, min.
input impedance		R~cording terminallOkn min.
Nominal input level		L: O.4V, max.
		H: 2.0V, min.

Block diagram

						Erase head		------ Record/playback head TAPE
				Control
				circuit
									Differentiation
+5V					~__~____________		~____		circuit
o-__~______________									~03003		Amplifier
			SW3002						R3003		03003
									R3004
			Mechanically interlinked switch
									Amplifier		Amplifier/
									circuit	+5V	Limiter
									03001	-~---!circuit(1/2),
									03002		IC3001
		WRITE
											Waveform
											shaping
											circuit (2/2),
											IC3001
											Amplifier
											circuit,
											03004
	READ

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