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SECTION 1
TECHNICAL
DESCRIPTION
1-1.
TECHNICAL
SPECIFICATIONS
Technical specifications for PS-2250/TTS-2250
are listed in TABLE
1.
Note: TTS-2250 is a turntable unit only.
TABLE 1. TECHNICAL
SPECIFICATIONS
Speeds:
Turntable drive:
Wow and flutter:
(weighted)
Signal-to-noise
ratio:
(weighted)
Motor:
Turntable platter:
Start-up-time:
Power
consumption:
Power
requirements:
Dimensions:
PS-2250
TTS-2250
Net weight:
Shipping weight: .
General
33-1/3, 45 rpm +4 %, adjustable
Direct drive system
Less than 0.07 % (DIN 45507)
Less than 0.04 % (WRMS)
Greater than 58 dB (JIS)
Greater than 67 dB (DIN 45544)
AC servo-controlled motor
310 mm (12-3/16') dia, 1.5 kg
(3 lb 5 oz) diecasted aluminium
Less than 2.5 seconds
15 watts
110, 127, 220 and
240 V ac,
(GEP Model) 50/60 Hz
100,
120, 220
and
240
V ac,
(General Export Model) 50/60 Hz
490 mm (width)
x
185 mm
(height) x 395 mm (depth)
19-9/32" (width) x 7-9/32"
(height) x 15-11/32" (depth)
328 mm (width) x 146 mm
(height) x 357 mm (depth)
12-29/32" (width) x 5-3/4"
(height) x 14-1/16 (depth)
11.3 kg (24 lb 15 oz), PS-2250
7.5 kg (16 lb 9 oz), TTS-2250
14 kg (30 lb 14 02), PS-2250
10 kg (22 Ib), TTS-2250
Tonearm (PUA-114)
Type:
Arm length:
(Pivot-To-Stylus)
Over
hang:
Static balanced
245 mm (9-21/32")
14 mm (9/16')
Stylus
force
adjustment
range:
Oto 3g. 0.1 g increments
Anti-skating force
compensation
range:
Oto3g.
0.5 g increments
Tonearm height
precise adjustment
range:
4.65cm
~
5.15 cm
(1-27/32") ~ (2-1/32")
Cartridge weight
range:
4gtollg
CW-50
(optional counterweight)
10g
~17¢g
Shell-head weight:
10.5 g
1-2. PRINCIPLE OF AC SERVO SYSTEM
Fig. 1-1 shows a simplified diagram of the ac
servo system employed in this set. Since the ac motor
speed
is proportional
to
the applied
ac voltage,
it is controlled by varying the applied voltage (Em) to
the motor. This is effectively performed by means of
series resistor Rv.
In practice, series resistor Rv is replaced by the
diode-bridge circuit and collector-emitter impedance
of a power
transistor
as
illustrated
in Fig.
1-2.
Note
that
the
diode-bridge
determines
only
the
direction of the ac current which flows in the power
transistor.
Motor
speed
is converted
into
ac
signal by
means of a direct-coupled
frequency generator. The
servo amplifier
compares
this signal against a very
stable
dc reference
voltage,
and
then
controls
the
collector-emitter impedance of power transistor. Any
error.in motor
speed results in a correction. voltage
supplied to the motor.
SERVO
AMP
Fig. 1-1.
Principle of ac servo system
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