Hitachi HT-61S Service Manual

Oa IE PAN@la |
SERVICE MANUAL
;
TY |
No. 235EGF
=
HT-61S/R10
ILL
SPECIFICATIONS
Type 2-speed direct drive automatic system
Platter Aluminum alloy die-cast, 310 mm outer
diameter
Motor Brushless, slotless, coreless DC servo
"Unitorque"' motor
Speed 2-speeds; 33-1/3 and 45 rom
Speed change system Electronic change-over system
S/N 78 dB (DIN-B)
Wow and Flutter 0.025% WRMS
Speed deviation 0.003%
Speed drift (for time) | 0.003%/hour
(for temperature) 0.003% (5 — 35°C)
Effective length 220 mm
Overhang 15 mm
Tracking error 2?
Lead wire capacitance 140 pF
Adjustable force range
(scale) 0 — 3g/1 turn of the balance weight
(directly readable in 0.1 g steps)
Acceptable cartridge
weight 4-— 10g
When a HITACHI cartridge is attached.
Cartridge Dual magnet type (MT-35)
Frequency response 10 — 25,000 Hz
FEATURES
1. Unitorque motor
2. Quartz control (quartz lock PLL servo)
3. Handy fully automatic mechanism (with manual
priority mechanism)
4. Electronic return detection mechanism (PHOTO-
SENSOR SYSTEM)
5. Two-motor system with improved performance
6. Highly sensitive straight tone arm with gimbal
Output voltage
Channel difference
Channel separation
Tracking force
Stylus tip
Power source
Power consumption
Dimensions
Weight
Other devices
support
switches
8. Structure resistant to howling
9. Viscous damped arm lifter never damages stylus tip
10. Easily removable dust cover
11.
Remote control possible (HT-R10)
CONTENTS
SPECIFICATIONS ...............cccccceceesseeeeererenes
FEATURES ..............
SERVICE POINTS ....
ADJUSTMENTS. 5:3 siisccccacccecewascunerecevanteaenes
AUTOMATIC MECHANISM
OPERATIONS oi. cicscccaieacvacssasazcscvocdeeaeotsers
DESCRIPTION OF THE NEW CIRCUITS .........
BLOCK DIAGRAM 6..ciss65 2 s6sscsscsseacosapaensaaeet
PRINTED WIRING BOARD ................00068 15, 17
CIRCUIT DIAGRAM ...............cccceeeseeeees 16, 18
REPLACEMENT PARTS LIST .............cceeesees
EXPLODED VIEW ...............cecceeeeevees
TROUBLESHOOTING
2.5 mV at 1 kHz 50 mm/sec.
1 dB at 1 kHz
23 dB at 1 kHz
1.5 — 2.5 g (recommended 2 g)
Diamond stylus (DS-ST30)
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
7 watts
435 x 365 x 110 mm
(17-1/8" x 14-3/8" x 4-5/16"')
6.0 kg (13.2 Ibs.)
Auto-size, auto-speed, auto in, auto
repeat, auto return, auto cut, anti-
skating, tracking force direct-reading
balance weight, viscous damped cueing,
repeat indicator, quartz locked indicator,
speed indicator, remote control terminal
(HT-R10 only)