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1.
GENERAL
DESCRIPTION
The Dokorder
Model
7700 is
a
-track,2-channel,2-speed
tape deck
equipped
with 3-motor,
3-heacl
and sole-
noid operation
facility. Designed
for high dependability
and electrical
performance.
Their
features:
1.1
AMPLIFIER
CIRCUITRY
1.
The convenience
features
of the
7700's
amplifier
circuit
such
as the Monitor
Switch. Mic
AMp
Circuit, Head-
phone
AMP Circuit
and Level Meter
AMP
Circuit
built
in.
2. 4-separate
controls
permit
subtle input/output
level
adjustments.
3' 2-stepped
Equalizer
Switch
is equipped
to
use for
the several
type
of tapes.
The relation
between
the
tapes
and
the
position
of the
switch
is illustrated
below.
1-2 TAPE
TRANSPORT
MECHANISM
1. The convenience
features
of the
7700's
tape
transport such as
the all-electronic operation buttons,
pause
con-
trol,
tape
travel
counter are
positive,
and the
mechanisms themselves
are rugged and
dependable.
2. fhe tape transport
offers
an
Auto Stop convenience,
and
when
the tape reaches its
end in
any mode
(fast
for-
ward, rewind,
play
or record).
a
solenoid
releases the
locked
operating
control
(s)
to
place
the deck
in the stop
mode.
3.
High
dependability
is
proven
by using newly
improved
electronic solenoid control system that
reduces
the
powerconsumption
and heat up in the solenoid
and its control transistors.
4. Especially high
speecl-accuracy
and
surprising
wow/fluttel
characteristics
are realized
by using
most advanced
PLL
(Phase-Locked
Loop)
Servo
System in capstan
motor drive.
5. Newly designed
high-torque
outer-rotor eddy-current
motor is used
for reel drive.
1-3 POWER
SUPPLY CIRCUITRY
1.
The
primary
winding of the
power
transformer
is
provided
two
taps
100 V
and
54 V. The
former is used
for
the
reel motor
drive in the fast winding mode.
while
the
latter
is used for the reel motor
drive in the
rec/play
mode.
2.
On
the secondary
side,
the
transformer also offers
two windinqs for
5.6 V and 14 V x 2. The
former is used
for
illuminating
the
pilot
lamps, while the
latter
is
rectified
and then
used
to
power
the amplifiers, solenoid, PLL
circuit
and capstan
motor.
Equalizer
Switch
Type of
Tape
Normal
(button
out)
Scotch
#212
or equivalents
Special
(button
in)
Maxell
#UD-35
or equivalents
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