3-9.
OVERALL
OPERATION
OF
THE
DECK
We
have
so
far
seen
the separate operations
of
control
circuits, each
with
a specific
function
.
This section
briefly
describes the overall
l
opera-
tion
of
the deck operations in
the
reproduce,
pause, fast-forward, and rewind modes. Refer
to
Section 3-10·3
for
operation in the record
mode.
3-9-1 Reproduce mode
See
Fig. 3-19.
To
explain operations in the reproduce mode,
we
divide the system
into
two
subsystems. One
is
the head
base
subsystem
that
operates when
0601
is
turned on
by
the H-/evel signal
output
from
pin 12
of
U601. The
other
is
the
pinch
roller
subsystem
that
operates, when
0602
is
turned on.
1)
Head
base
subsystem
This
goes
through
the
following
steps when
0601
is
turned on.
a. The
head
base
solenoid operates.
b.
A delay signal
is
applied
to
the
pinch
roller
solenoid drive
circuit
via
the
flashing
circuit
of
the head
base
solenoid.
c.
0692
tu
rns
on and the capstan
motor
rotates.
2) Pinch roller subsystem
This
goes
through the
following
steps
after
a
de
llay long enough
for
the operation
of
the
head
base
solenoid
following
the
turning
on
of
0602.
a.
The pinch
roller
solenoid operates.
b.
The reel
motor
rotates.
c.
The tape-end
detection
circuit
becomes
ready
for
operation.
d.
0614
turns on and the reproduce
amplifier
is
released
from
muting.
Fl60Z
PAUSE
6 IN
II
PAUSE
OUT
C602
l
U601
PAUSE
R613
r
-'-
5
R614
3-9-2
Pause
mode
To
explain operations in the
pause
mode, we
divide the system
into
the head
base
subsystem
(as
in the reproduce mode)
that
operates,
with
0601
turned on
by
the H-Ievel signal
output
from
pin
11
of
U601,
and the
indicator
sub-
system
that
causes
the PAUSE
indicator
to
light
when
0603
is
on.
3-9-3 Fast-forward mode
In the fast-forward mode, we divide
the
system
into
the fast-forward subsystem
that
operates
when
an
H-
'Ievel signal
is
output
from
pin 15
of
U601 and
the
fast subsystem
that
operates when
an
H-Ievel signal
is
output
from
pin 14
of
U601.
1) Fast-forward subsystem
The reel
motor
rotates.
2) Fast subsystem
a.
The fast
so
lenoid operates.
b. The
tapeend
detection
drcuit
becomes
ready
for
operation.
3-9-4
Rewind
mode
In
~he
rewind mode, we divide the system
into
the
rewind subsystem
that
operates
when
a
H-
level is
output
from
pin 13
of
U601 and the fast
subsystem
that
operates when a H-Ievel
is
output
from
pin
14
of
U601.
1)
Rewind subsystem
a.
The reel
motor
rotates.
b. The
memory
circuit
becomes ready
for
operation.
2) Fast subsystem
a.
The fast solenoid operates.
b.
The tape-end
detection
circu·
it
becomes
ready
for
operation .
STANOARO
HEAD
BASE
SOLENOID
L
69Z
+5V
SPEED
54
L...-
___
...4-~
HEAD
BASE
SOLENOID
DRIVE
CIRCUIT
0514
REMOTE
CONTROL
Fig. 3-20
Schematic
of
pause mode
24
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