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HT-21
SAFETY
PRECAUTIONS
The following precautions should be observed when servicing.
1. Since
many
parts
in the
unit
have
special
safety
related
characteristics,
always
use
genuine
Hitachi's replacement
parts.
Especially critical parts in the power circuit block should not be replaced with other makers.
Critical parts are marked with
/\ in the schematic diagram and circuit board diagram.
2. Before
returning
a repaired
unit to the customer,
the service technician
must
thoroughly
test the unit to ascertain that it is
completely safe to operate without danger of electrical shock.
SPECIFICATIONS
Type
Platter
Motor
Speed
S/N
Wow & Flutter
Effective length
Overhang
Tracking error
Adjustable force range
(scale)
Acceptable cartridge
weight
Lead wire capacitance
Accessory HITACHI!
cartridge
Cartridge
2-speed belt drive system
Aluminum
alloy die-cast, 310 mm
outer
diameter
DC servo motor
2 speeds, 33-1/3 and 45 rem
70 dB (DIN-B)
0.05% WRMS
220 mm
15mm
2°
0 — 34/1 turn of the balance weight
(directly readable in 0.1 g steps)
4-9g
140 pF
Dual magnet type (MT-35) (for U.S.A. &
Canada)
Moving magnet type (MT-15) (except
U.S.A, & Canada)
Frequency response
Output voltage
Channel difference
Channel! separation
Tracking force
Stylus tip
Power source
Power consumption
Dimension
Weight
Other devices
CONTENTS
10 — 25,000 Hz
2.5mV
(MT-35) or 3 mV (MT- 15)
at 1 kHz 50 mm/sec.
1 dB at 1 kHz
23 dB at 1 kHz
1.5 — 2.5 g (recommended 23)
Diamond stylus (DS-ST35 or DS-ST15)
120 V 60 Hz for U.S.A, & Canada standard
220 V 50 Hz for Europe staniard
240 V 50 Hz for U.K. & Australia standard
110—120/220—240 V 50/60 Hz for Asia &
Latin American countries
3 watts
435 (W) x 365 (D) x 110 (H)rmmm
(17-1/8 x 14-3/8 x 4-11/32
4 kg (8.8 Ibs.)
Auto return, auto cut, anti-ska ting, track -
ing force direct-reading balaneé weight,
viscous damped cueing.
SPECIFICATIONS
AND
PARTS
ARE
SUBJECT
TO CHANGE
FOR
IMPROVEMENT.
BELT DRIVE TURNTABLE
March
1982
TOYOKAWA
WORKS
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