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- SERVICE
MANUAL
SAFETY PRECAUTION
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 A\ 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
Speed change system
S/N
Wow
and Flutter
Speed deviation
Speed drift
(for time)
(for temperature)
Tonearm
Effective length
Tracking error
Lead wire capacitance
Adjustable force range
2-speed quartz controlled direct drive fully
automatic turntable
Aluminum alloy die-cast, 300 mm
outer
diameter
Brushless, Slotless, Coreless DC servo
"unitorque'' motor
2-speeds; 33-1/3 and 45 rpm
Electronic change-over system
78 dB (DIN-B)
0.025%
(WRMS)
0.003 %
0.003% /hour
0.003%
(5 — 35°C)
Dynamic balance type
Linear tracking tonearm
95 mm
+Q0.1°
140 pF
Q — 2 gidirectly readable in 0.25 g steps)
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HT-L7O
CONTENTS
Acceptable
cartridge weight
Cartridge
Frequency response
Output voltage
Channel difference
Channel separation
Tracking force
Stylus tip
Power source
Power consumption
Dimensions
Weight
SPECIFICATIONS vnsninnscanisnnnasnneuncanocnnamonnnanmae
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FEATURES:
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RECORD PLAY AND PRECAUTIONS
...............
4
SERVICE POINTS
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PRINTED
WIRING BOARD
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CIRCUIT DIAGRAM
...............
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BLOCK DIAGRAM
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ADJUSTMENTS
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REPLACEMENT PARTS LIST .................0008 17,20
EXPLODED VIEW
6g
MM
type (MT-7Q)
10 — 25,000 Hz
2.5 mV at 1 kHz, 50 mm/sec.
1 dB at 1 kHz
23 dB at 1 kHz
1.59
Diamond stylus (DS-ST/70Q)
120 V 60 Hz for U.S.A. and Canada
standard
220 V 50 Hz for Europe standard
240 V 50 Hz for U.K. and Australia
standard
110 — 120/220
— 240 V 50/60 Hz for Asian
and Latin American countries
17 watts
315 (W) x 83 (H) x 315 (D) mm
5 kg (11 Ibs.)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE
FOR IMPROVEMENT.
DIRECT DRIVE AUTOMATIC TURNTABLE
December 1981
TOYOKAWA WORKS
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