Teac MT-20D-IO - Page 27

3-2-2 Write circuit and erase circuit
Fig. 311 shows the block diagram of the write circuit and erase circuit.
WO
WEN
ROY
FP
I..VS
TRO
EEN
RMOOE
TR 0/2
TR 1/3
ECI..K
r--------------l
I
I
WRITE HEAD
I
DRIVER
I
I
I
I
I
I
LOGIC
I
I
-
TR 0/2
I
il
jwRrrEGATE
I
I
I
-
TR 1/3
I
WRITE GATE
I
I
I
ERASE
I
'--
GATE
I
I
I
ERASEHEAO
I
DRIVER
I
I
~a _____________ ~
...
...
...
~
...
WRITE HEAD
--TR 0/2
:21
..It
:::lI ,_
:ll J-
-TR 113
ERASE HEAD
----:-zf
~;,
x
Fig. 311 Write circuit and erase circuit block diagram
The write circuit and erase circuit consist of a write head driver, write
gate, erase head driver, erase gate, and logic circuit for the above
circuits, etc.
The write head driver feeds the write current to the write head according to
the write data given from the PCBA interface control.
The write gate
changes over the supply current between the track 0/2 side and track 1/3
side according to the track to be data recorded.
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