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Hitachi HA-3800 Service Manual

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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

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