Hitachi HT-MD46 Service
SAFETY
PRECAUTION
The following precautions should be observed when servicing.
(US. CS, BK, SA, VK, ZS, VZ, EW)
CONTENTS - INHALT - SOMMAIRE
SPECIFICATIONS : TECHNISCHE DATEN -
CARACTERISTIQUES TECHNIQUES.......
1,2
DISASSEMBLY : ZERLEGEN -
DEMONTAGE
..............2020005
3,5,6
ADJUSTMENT - . EINSTELLUNG -
REGUAGE
4 cee
oh ee PA
ee 7,8,9
DESCRIPTION OF NEW CIRCUIT -
BESCHREIBUNG DER NEUEN SCHALTKREISES -
DESCRIPTION DU NOUVEAU CIRCUIT
....
10
DESCRIPTION OF NEW PARTS -
BESCHREIBUNG DER NEUEN TEILE -
DESCRIPTION DES NOUVELLES PARTIES...
11,
BLOCK DIAGRAM - BLOCKSCHEMA -
SCHEMA
.....
PRINTED WIRING BOARD : PRINTPLATTEN -
eee
e e
ee
ee eee
ee ee
15
CIRCUIT DIAGRAM : SCHALTPLAN -
PLAN DE CIRCUIT
TIMING CHART FOR HT-/MA -
ABLAUFDIAGRAMM
FUR HT-/MA -
DIAGRAMME
DE CALAGE POUR HT-/MA...
17
EXPLODED VIEW - AUSEINANDERGEZOGENE
DARSTELLUNG- VUE ECLATEE.........
18
REPLACEMENT PARTS LIST - ERSATZTEIL-
LISTE - TABLEAU DESPIECES
..........
PLAN DE BASE
12, 13
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 circuit diagram and printed wiring board.
2. Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain that it iscomplete-
ly safe to operate without danger of electrical shock.
SPECIFICATIONS
Cartridge
Frequency response
Type
2-speed, belt-drive
Output voltage
fully-automatic turntable
Channel difference
Platter
Aluminum alloy die-cast,
Channel separation
$301 mm outer diameter
Tracking force
Motor
DC servo motor
Stylus
Speed
33-1/3 and 45 rpm.
Power source
Speed change system
Electronic change-over system
Signal to noise ratio
70 dB (DIN-B)
Wow and flutter
0.045% (WRMS)
Tonearm
:
linear tracking tonearm
Effective length
137 mm
Power consumption
Dimensions
Weight
Dual magnet type
10 — 25,000 Hz
2.5mV at 1 kHz, 50mm/sec.
1 dB
25 dB
29g
Diamond stylus (DS-ST16)
120 V/60 Hz (for US, ¢ S)
220 V/50 Hz {for ES, 7S, KS, VS)
240 V/50 Hz (for BS, SA)
110-120/200-240 50/6) Hz
(for EW, ZW)
9.5 watts
370 (W) x 89 (H) x 360 (D) mm
4kg
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
STEREO TURNTABLE
October 1986
TOYOKAWA
WORKS
