Data Recorder; Cassette Specification - Sharp MZ-700 Service Manual

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.
Block diagram
+5V
Control
circuit
• 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.
Erase head
- - - - - - Record/playback head TAPE
Differentiation
circuit
o-__
~
______________
~
__
~
____________
~
____
~03003
R3003
R3004
Amplifier
03003
SW3002
Mechanically interlinked switch
WRITE
READ
15
Amplifier Amplifier/
circuit +5V Limiter
03001
-~---!
circuit(1/2),
03002 IC3001
Waveform
shaping
circuit (2/2),
IC3001
Amplifier
circuit,
03004