|228,000yen(around the 1981 time)
The stereo cassette deck developed as a second
generation of 680ZX as a single speed machine of only standard speed.
Dolby NR processor which became independent, respectively was adopted as the
sound-recording system and the play system, and the merit of a discrete and 3
head stream compositions is employed efficiently.
frequency-dispersion type double capstan scheme is adopted as a mechanism
part,Since two capstan diameters and a fly-wheel diameter were changed while
realizing the stable tapes run and the uniform head touch, it was avoided that
the periodicity of a flutter overlaps and it has achieved the reduction of
rotation unevenness, and the modification of the modulation noise. Moreover, the
ill effect by fine oscillation of the pressure ununiformity of a pad or pad
spring material is prevented by equipping a tapes pad lifter.
if the oscillation produced from the body of revolution of a motor or others
gets across to a tapes, it will become a cause which makes a flutter increase.
In order to reduce this, compared with iron, the big aluminum alloy of a damping
characteristics is used as a chassis material, by carrying out the outsert of
the resin to this, the fine oscillation was absorbed and the occurrence of the
vibration is prevented.
If a control is pushed, a logic circuitry will
work, and the operation of a mechanism has the structure of operating mechanism
Ç by a control motor.
Not using a solenoid plunger, the scheme which drives
a cam by a motor has realized reduction of operation sound, reduction of a tapes
or the damage to transport, fall of a temperature rise, and low power-ization.
In order to adopt the PLL servo motor as the main motor, to detect a
rotational frequency variation, to compare the signal and phase of a
reference-signal oscillator and to control to an exact rotational frequency, the
highly precise rotation is realized.
The recording head, the reproducing
head, and the erase head have adopted as a head the discrete 3 head scheme
completely separated on the structure.
The P-8L type is adopted as the
reproducing head. The loss which takes place by the narrow gap of 0.6 micron by
adopting the lamination core of Krista Roy at the time of a play was prevented, and the frequency characteristic extended to 22kHz is realized. Furthermore, the
form which loses a low-pass surge (contour effect) is taken, and the play [ flat
/ to super-low-pass one ] is realized. Moreover, the endurance of 10,000 hours
or more is realized by adopting the special form which abolishes the Ð¸è event
of a core.
The R-8L type is adopted as the recording head. The reproducing
head serves as the same a 3.5-micron gap with the lamination core of Krista Roy.
Moreover, special form was adopted also as this head and the endurance of 10,000
hours or more is secured like the reproducing head.
The E-8L type is adopted
as the erase head. They are the ferrite core which was excellent in the RF
property, and a double gap type which uses a sendust core with high flux density
at a leading end.
The double NF circuitry which applies the negative
feed back to an electrolytic capacitor is adopted as a sound-recording equalizer
circuitry, a playback-equalizer circuitry, and an output line amplifier
circuitry. The direct-current stabilization is attained at the same time it
suppresses low distortion which this generates by a capacitor.
sound-recording equalizer, the recording head and the reproducing head, and a
play equalizer amplifier are linked directly, respectively, a coupling capacitor
is eliminated, and a modification of a property, such as preventing a phase
shift the distorted modification at the time of a play and low-pass, is aimed at
at the time of a sound recording.
The auto calibration functionality is
carried and azimuth adjustment and a coordination of a sound-recording
regeneration level can carry out that it is simultaneous and automatically by
one calibration operation.
Azimuth adjustment starts a coordination by
pushing the Auto Cal button and the Play button from a sound-recording pause. By
a 400Hz testing tone being recorded and played first, detecting the phase
difference of a right-and-left channel, and the signal being sent to operational
amplifier, and controlling a motor, the lever connected with the belt through
the gear is moved, and the tilt angle of the recording head is adjusted. If an
azimuth gap is lost, the phase difference will also be lost, a motor stops, and
a coordination is completed.
A start-up of azimuth adjustment will also
start level adjustment simultaneously. The signal with which the 400Hz testing
tone was reproduced is detected through buffer amplifier, and is added to a
comparator. It is compared with a reference signal by the comparator, and a
motor rotates according to the voltage difference, the connected slide volume
for calibrations is operated, and the signal current (recording level) of the
recording head is changed. When a play Output voltage changes by this and it
becomes equal to reference level, a motor stops and a coordination is a
Coordination time is about 6 seconds also including azimuth adjustment,
and the error serves as a span of }0.5dB. Moreover, an adjustable range
is }2.5dB from a base value, and the usual tapes for musics is covered
The bias regulating function which can adjust a bias current to
a value suitable for a using tapes is carried.
This coordination is adjusted
looking at the indicated value which appeared in the level meter by
sound-recording play of a 15Hz (-20dB) testing tone. At this time, the indicated
value of a level meter is expanded by 20dB so that it may be easy to adjust.
The volume for a coordination is prepared a tapes selector exception and
according to the right-and-left channel, and the adjustable range has become EX
position (normal system)}4.5dB, SX position (CrO2 system)}3dB, and ZX position
In addition to the Dolbey B type NR, the Dolbey C type
NR with the higher noise reduction effect is carried as noise reduction.
has the same principle of operation as B type fundamentally, and the Dolbey C
type NR is making two noise reduction processors of a high-level stage and row
level stage take charge of 10dB at a time, it is total and has realized a noise
reduction of a maximum of 20dB.
Moreover, by C type, the slide band scheme which carries out variable to
frequency which starts operation input level according to a frequency component
is adopted, and the bleeding event called "a noise breathes"
By a Dolby NR
switchpoint, a switchover of C type / B type / off is possible.
the wide-range peak level meter of function-logic-diagram display device which
displays 40dB - +10dB by 24 segments.
The RAMM functionality which can
select and pull out the head of one favorite music out of the music recorded by
the tapes is carried.
If the easy queuing functionality is carried and a
pause button is pushed into FF/Rew, speed can be downed to abbreviation 1/3, and
the description of a sound recording can be heard. Furthermore, if it continues
pushing a FF/Rew button, about 1/of speed falls to 5, and can pull out the head
of music easily.
If the Rec mute functionality is carried and the Rec
button is further pushed during a sound recording, only while continuing
pushing, an input signal is omitted and a silent sound-recording part can be
The MPX filter is built in.
A timer sound-recording play
is possible by using an audio timer.
An optional remote Control unit can
be used and can be operated from the distant location.
||Stereo cassette deck
||Recording head: R-8L
Reproducing head :P
Erase head: E-8L
|Wow and flutter
||0.04% or less Wtd rms
0.08% or less Wtd
|Frequency characteristic (a recording level
||20Hz-22kHz}3dB (ZX tapes)
(SX, EXII tapes)
|A comprehensive S/N ratio (IHF A-Wtd rms,
||Dolby C on: 72dB or more (70 microseconds,
Dolby B on: 66dB or more (70 microseconds, ZX tapes)
|A comprehensive distortion (400Hz, 0dB)
||0.8% or less (ZX tapes)
1.0% or less
(SX, EXII tapes)
||60dB or more (1kHz, 0dB)
||37dB or more (1kHz, 0dB)
||60dB or more (1kHz, 0dB)
||50mV / 50kohm
|An Output voltage/impedance
|Line: 1V (400Hz, 0dB) / 2.2kohm
Headphone: 45mW (400Hz, 0dB)/8ohm load intensity
|DC output only for a black-box series
||}10V or 125mA maxima
||A maximum of 36W
||Width 482x height 143x depth of 340mm
||Wired remote control RM-200 (2,000yen)