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No. 347
EGF
HT-t55
CONTENTS
.
INHALT' SOMMAIRE
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
circuit
diagram.
,^\
SPECIFICATIONS
Type
Platter
Motor
Speed
Speed change
system
s/N
Wow
and
flutter
Speed
deviation
Speed
drift
(for
timel
lfor temperaturel
Tonearm
Effective
length
95
mm
Tracking
error
+0.1"
Lead
wire
capacitanca
140
pF
2-speed
quartz
controlled direct
drive fully
automatic
turntable
Aluminum
alloy dre-cast,
296
mm outer
diameter
Brushless, Slotless, Coreless
DC
servo
"Unitorque" motor
2-speeds;33-1/3
and
45
rpm
Electronic change-over system
78
dB
(DrN-B)
0.025%
(wRMS)
oo03%
O
OO37olhour
o.0o3%
(5
-
35'C)
Linear
tracking tonearm
Cartridge
Frequency
fesponse
Output voltage
Channel
difference
Channel
s€paration
Tracking force
Weight
Stylus
tip
Power
source
Power consumption
Dimensions
Weight
the
unit
to
ascertain
that
Dual magnet type
(MT-33)
10
-
25,000
Hz
3.5
mV
at
1 kHz,
50
mm/sec.
ldBatlkHz
23
dB
1 kHz
1.25
+0259
59s
Diamond stylus (DS-ST33)
'I
20V
60
Hz
for
U
S
A
and Canada sîandard
22OV
50
Hz
for
Europe standard
240V
50
Hz
for
U
K
and Australia standard
11O-12O/22O-240V
50/60
Hz
forAsian
and
Latin American countries
15
watts
315 (W)x83
(H)x
31
5
(D)
mm
45ks(1Olbs)
2.
Betore
returning
a repaired
unit
to
the
customer,
the
service
technician must thoroughly
it
is
completely
safe to operate
without
danger of electrical shock.
l,vtr
I
Ett
I
D.
iltt-rALr'
Dr.rrvilYrArrrE
SPECIFICATIONS'
TECHNISCHE
DATEN,
CARACTÉRTSTTOUE
TECHN1OUES..................
..... 1,2
FEATURES. BESONDERHEITEN.
CARACTÉNISIOUCS....
T,
Z
SERVICE POINTS
.
WARTUNGSPUNKTE.
POINTS D'ENTRETIEN.
ADJUSTMENT
.
EINSTELLUNGEN
.
RÉGI.AGE.
....................
6,
7
BLOCK
DIAGRAM
.BLOCK
SCHEMA.
scHEM4.........
..........................
I
REPLACEMENT PARTS
LIST'
ERSATZTEITLISTE
.
TABLEAU
DES
PIECES....
..... 9, îO,
15
PRINTEO
WIBING
BOARD ' PRINTPI.ATTEN
.
PLAN
DE
8ASE................
................................. I
1
CIRCUIT
DIAGRAM.SCHATTPI.AN .PLAN
DE
CIRCUIT..... 12
EXPLODED
VIEW
.
AUSEINANDERGEZOGENE
DARSTELTUNG.VUEÉCLATÉE
........................î3,14
DESCRIPTION
OF
THE NEW
COMPONENT'
BASCHREIBUNG.
DER
NEUEN KOMPONENT.DESCRIPTION
DE I-A
NOUVELLE
COMPOSANT..........
1
2.
3.
Low-mass,
dynamic balance
linear
tracking tonearm
Disk
jacket
size
for
easy
installation anywhere
Slimly designed Unitorque
motor
Ouartz control (quartz lock
PLL
servol
Repeat play
from
any
position
on
disk {program
repeat)
Timer staÉ from
any
position
on
the
Cisk
4.
5.
6.
SPECIFICATIONS
AND
PARTS ARE
SU&'ECT
TO CHANGE
FOR
IMPROVEMENT.
DIRECT DRIVE
AUTÍIMATIC
TURNTABLE
October î
982
TOYOKAWAWORKS

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