Hitachi HT-840 Service Manual

@HITACHI
SERVICE
SPECIFICATIONS
Motor Section
2-speed, Quartz-locked,
Type:
Motor: Flat-type,
"uni-torque"
306 mm 4, aluminum die cast turntable
Turntable:
220 kg•cm2 (including platter mat)
Inertial mass:
Rated speed: 33-1/3, 45 rpm
Electronic
Speed selection:
Electronically
Speed adjustment:
adjustment
button being off)
Speedadjust range:
Signal-to-noise ratio: 77 dB (DIN-B)
0.02% (WRMS)
Wow and flutter:
0% (within 120 g in terms of tracking force)
Load characteristics:
(with the QUARTZ LOCK button turned on)
Within 0.003% (with the QUARTS
RPM deviation:
button
1/2 revolution (at 33-1/3 rpm)
Rise characteristics:
Within 2 seconds (at 33-1/3 rpm)
Electronic braking:
I-pattern stroboscope with indicator lamp
Auxiliary facility:
Semiconductors: 10 ICs, 27 transistors and 32 diodes
Tone Arm Section
Static-balance
Type:
a shock-absorbing
Overall length: 326 mm
Effective length: 240 mm
15 mm
Overhang:
1050'
Tracking error:
O — 3 g (0.1 g direct reading)
Tracking force range:
Cartridge weight
11 — 29 g (including the head shell provided)
range:
I I g, aluminum die cast head shell
Head shell:
MANUAL
direct-drive turntable
brushless, DC servo, direct-drive
motor
control system
controlled, independent speed
(with the QUARTZ LOCK
LOCK
turned on)
type tone arm equipped with
system
STEREO TURNTABLE
October
English
Deutsch
Franqais
Designand specificationssubjectto changewithout notice
for further improvement.
Head shell connector: Chucking-lock
48 — 60 mm (clearance between cabinet and
Arm height range:
head shell's cartridge mount)
Viscons damped arm lifter, anti-skating
Other facilities:
system
Cabinet
2.5 specific gravity, 14 mm thick, BMC board
Top board:
Wooden part: 40 mm thick, solid type high density particle
board
Acrylic resin
Dust cover:
Opening and shutting torque adjustable, dust
Hinges:
cover removable
Combined use of elastic material and springs,
Insulators:
height adjustment
Others
220 — 240 V, 50/60 Hz
Power supply:
Power consumption:
490 (W) x 180 (H) x 413 (D) mm (including
Outer dimensions:
hinges and front panel mark with dust cover
being shut)
Weight: 15 kg
Accessories
Output cord. .
EP adaptor...
Screwdriver
Ground wire.
Cartridge mounting screws............
NOTE: No cartridge is supplied asan accessory with this turntable.
1977
H T- 840
No. 125
type connector
possible
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