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Teac C-1 User Manual

Teac C-1
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TAPE
TRANSPORT
SECTION
2.
CONTROL
P.C.B.
2-1
INITIAL
POWER
RESET
CIRCUIT
The
initial
power
reset
circuit
is
provided
to
prevent
the
SYS-CON
from
being
operated
mistakenly
by
transient
phenomena
which
takes
place
when
the
power
switch
of
C-1
is
turned
on.
(Refer
to
Fig.
8)
When
the
power
switch
of
the
tape
deck
is
tumed
on,
the
regulator
on
the
power
supply
PCB
operates
and
13V
DC
is
supplied
to
the
control
PCB.
At
the
same
time,
current
flows
in
C517
via
route
(1)
and
charges
it
and
then
Q517
turns
on.
Then,
the
base
current
of
Q516
flows
in
route
(2)
and
Q516
also
turns
on
and
supplies
a
high
level
reset
signal
to
the
SYS-CON
in
the
route
(3).
This
reset
signal
resets
operation
memories
and
counters
in
the
SYS-CON.
After
C517
has
discharged,
Q517
and
Q516
turn
off
and
the
reset
signal
supply
is
stopped.’
The
reset
signal
is
issued
for
about
one
(1)
second
after
the
power
switch
is
turned
on.
When
the
power
switch
is
turned
off,
C517
is
rapidly
+13V
discharged
and
prepares
for
the
next
turning
on
of
the
power
switch.
When
the
power
switch
is
turned
on
with
no
cassette
loaded
in
the
tape
deck,
Q516
is
turned
on
conti-
nuously
by
the
current
in
route
(5)
and
SYS—CON
is
left
in
the
reset
status.
The
reset
status
is
released
by
loading
a
cassette.
If
the
power
supply
voltage
of
the
control
circuit
fluctuates,
unnecessary
operations
may
take
place
owing
to
different
charging
and
discharging
time
constants
or
the
threshold
voltage
of
circuits
driving
solenoids
and
LEDs.
To
prevent
such
unnecessary
operation,
the
circuit
com-
prising
D539,
Q514
and
Q515
keeps
inputs
of
these
drive
circuits
at
a
low
level
when
the
power
supply
voltage
is
too
low.
When
the
power
supply
voltage
is
below
about
8V,
Q514
turns
off
and
Q515
turns
off
so
they
inhibit
opera-
tion
of
the
drive
circuits
so
that
solenoids
and
LEDs
are
not
turned
on.
TO
AMP.(REC
MUTE
SIG.)
-
TO
REC
MUTE
LED
DRIVER
TO
AMP(REC
SIG)
TO
REC
LED
DRIVER
TO
SOLENOID
DRIVER
TO
SOLENOID
DRIVER
TO
PAUSE
LED
DRIVER
}
TO
REEL
MOTOR
DRIVER
SYS-CON
U501
R548
=
|
RES
K)
|
|
l
SYS-CON
OUTPUT
INHIBIT
CIRCUIT
OURING
TAPE
LOADING
REFER
TO
2-3
ON
OFF
°°
O
CAPSTAN
MOTOR
SW
S693
ry¥©
@s
D545
@
T-1296
Fig.
8°
Initial
Power
Reset
Circuit

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Teac C-1 Specifications

General IconGeneral
BrandTeac
ModelC-1
CategoryCassette Player
LanguageEnglish

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