Hitachi HA-3800 Servicehandbuch

No.
262EGF
HA-3SOO
CONTENTS
SPECTFICAT|ONS
.........1
FEATURES.
...........1
ADJUSTMENT....
.........3
DESCRIPTION
OF
THE NEW CIRCUITS..
.....4
CHECKING OF THE OPERATION
OF
THE
PROTECTTON CrRCU
rT
....
.........6
CIRCUIT
DIAGRAM
......9
PRINTED
WIRING
BOARD
.........10
DISASSEM BLY
AND
REPLACEMENT.
.,.....12
REPLACEMENT PARTS
LIST
......14
FRONTAND
REAR
PANEL...
......17
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
Power output
(Both
channels driven)
Power bandwidth
Frequency
characteristics
TUNER,
TAPE
PHONO
Harmonic distortion
(8
ohmsl
(at rated output)
/.\
lat1l2
rated outputl
I
ntermodulation distortion
latl/2
rated output)
I
nput sensitivity/ lmpedance
PHONO
TUNER, AUX
TAPE PLAY
'
Output level
TAPE REC OUT
35
watts* per channel,
min. RMS at
8
ohms
from
20 Hz
to
20 kHz,
with
no more
than
0.05% total
hormonic distortion.
35W/ch
+
35W/ch
(8
0hms,
1 kHz,
T.H.D.
0.05%)
35W/ch
+
35W/ch
(4
ohms,
1 kHz,
T.H.D.0.05%)
10
Hz -
30 kHz (8
ohms,
l12Rated
T.H.D.0.1%)
20 Hz
-
70 kHz
(+0.5,
-3.0
dB)
RIAA
+ O.sdB
Less
than 0.05%
Les
than 0.05%
Less
than
0.05o/o
2.5 mY/47 k-ohms
'150
mV/40
k-ohms
150 mV/zl0 k-ohms
150 mV
Phono overload level
Signal-to-noise ratio
(lHF
A
PHONO
TUNER, AUX,
TAPE
Damping factor
Bass control
Treble control
Loudness control
Subsonic
filter
Power
supply
Power consumption
Dimensions
Weight
200 mV
(at
1 kHz)
networkl
80
dB
100 dB
30 (1 kHz,
8
ohms)
+8
og (1oo
Hz)
+8
da (10
kHz)
+6
dB
(100
Hz)
+4
dB
(10
kHz)
20
Hz
AC
120 V 60
Hz, -220
V
filffi
Hz,
-240
V 50/60
Hz
or
-120
V
1220 V
I
240Y
filffi
Hz
110
W
(at 1/10
rated output)
180
W
(at 1/3
rated output)
300
W
(at
rated output)
zt35(W)
x83(H) x299(D)
mm
5.8
kg
FEATU RES
1. Super linear
circuit for low switching
distor-
tion.
2. Equalizer circuit
with
high sens:tivity
and
S/N
ratio.
3.
14
LEDs
power indication.
Measured pursuant
to
the
Federal
Trade Commission's Trade Regulation Rule on Power Output
Claims
for
amplifiers.
Electronic protection circuit.
Connection
facilities for two pairs
of
speakers.
Sleek and chic design.
6.
SPECIFICATIONS
AND
PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
April
198
t
TOYOKAWA
WORKS
STEREO
AMPLIFIER