Hitachi HT-20S Serviceanleitung

@HITACHI
SERVICE
SAFETY PRECAUTIONS
The following precautions should be observedwhen servicing.
I. Since many parts in the unit have specialsafety relatedcharacteristics, alwaysuse genuineHitachi replacement parts.
Especiallycritical parts in the power circuit block should not be replacedwith other makes.
Critical parts are marked with
2. Beforereturninga repairedunit to the customer, t he service technician mustthoroughlytest the unit to ascertain that it is
completely safe to operate without danger Of electrical shock.
SPECIFICATIONS
Type 2-speed belt drive system
Platter
Aluminum
diameter
Motor DC servo motor
2 speeds, 33-1/3 and 45 rpm
Speed
70 dB (DIN-B)
Wow & Flutter
0.05%
Effective length 220
Overhang
15 mm
20
Tracking error
Adjustable force range
(scale)
O — 3 g/ I turn of the balance weight
(directly
Acceptable cartridge
weight
4—9g
Lead wire capacitance 140 pF
Accessory HITACHI
cartridge
Cartridge Dual magnet type (MT -35) (for U S.A
Canada)
Moving magnet type (MT -15) (except
U.S.A.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
BELT
February
MANUAL
in the schematicdiagramand circuit board diagram.
alloy diecast, 310 mm outer
WRMS
mm
readable in 0.1 g steps)
& Canada)
DRIVE
1 981
TOYOKAWA
HT-20S
CONTENTS
SPECIFICATIONS .
FEATURES
SERVICE POINTS . .
ADJUSTMENTS
EXPLODED VIEW .
REPLACEMENT PARTS
CIRCUIT DIAGRAM
PRINTED WIRING BOARD
Frequency response
10 — 25.000 Hz
Output voltage
2.5 mV (MT-35) or 3 mV (MT-15)
at I kHz 50 mm/sec.
Channel difference 1 dB at 1 kHz
Channel separation 23 dB at 1 kHz
Tracking force I .5 — 2.5 g (recommended
Stylus tip Diamond stylus (DS-ST35 or DSSTI
Power source
120 V 60 Hz for U.S.A.
220 V 50 Hz for Europe standard
240 V 50 Hz for U.K.
1
Latin
Power consumption 3 watts
Dimension 435 (W) x 365 (D) x 110 (H) mm
(17-1/8
Weight
4 kg (8.8 lbs.)
Other devices Auto return, auto cut. antiskating.
ing force direct-reading
viscous damped cueing.
TURNTABLE
WORKS
1
3
3
4
8
LIST
9,11
10
11
2 g)
5)
& Canada standard
& Australia standard
V 50/60 Hz for Asia &
America countries
x 14-3/8 x 4-1 1/32
track-
balance weight,