Marantz SC-8 Service Manual

e@ TONE Switch
The
TONE
switch
allows
the
number
of
coupling
capa-
citors
to
be
reduced
to
one
by
applying
the
PHONO
amplifier
output
signal
directly
to
the
line
amplifier
when
the
switch
is
set
to
the
TONE
OUT
position.
The
gain
and
input
sensitivity
are
not
changed
by
operating
this
switch.
TONE OUT HEADPHONE.
OUT
@ Line Amplifier
The
line
amplifier
consists
of
15
transistors
for
each
channel,
and
uses
push-pull
circuits
which
operate
in
class
A
in
all
stages
to
reduce
TIM
distortion
and
im-
prove
the
S/N
ratio.
The
input
stage
uses
a
source
follower
with
dual
FETs
to
prevent
it
(the
input
stage)
from
affecting
following
stage
characteristics.
The
source
follower
output
signal
is
applied
to
the
differential
amplifier
through
dual
transistors.
One
of
the
differential
amplifier
output
signals
is
phase-
inverted,
then
both
output
signals
are
applied
to
the
second
stage
push-pull
amplifier
through
buffer
amplifiers.
The power amplifier stage uses newly developed, super
high f7 (200 — 250 MHz) power transistors which are
connected in a Darlington configuration. This power
amplifier stage operates in pure class A, and features
flat frequency response and low TIM distortion. This
amplifier can drive headphones in class A operation, as
well as a main amplifier.
3. P.W. BOARDS
As can be seen from the circuit diagram the chassis of Model
Sc-8 consists of the following units. Each unit mounted on
a printed circuit board is descrided within the square
enclosed by a bold dotted line on the circuit diagram.
1. MCPhono......... mounted on P.W. Board P400
2. Power Supply ...... mounted on P.W. Board P800
3. Tone Amp. (L-Ch) ... mounted on P.W. Board PEO1
4. Tone Amp. (R-Ch) ... mounted on P.W. Board PEO2
5. Balance VR/i
Mode Switch .. .... mounted on P.W. Board PGOO
6. Loudness Switch &
Volume ......+-55 mounted on P.W. Board PJOO
7. Input Selector Switch . mounted on P.W. Board PS01
8. Tone In/Out Switch .. mounted on P.W. Board PTOO
9. Headphone ........ mounted on P.W. Board PX00
10. L.ED. . .......- mounted on P.W. Board PY00O
4. VOLTAGE CONVERSION
@
EUROPEAN
MODEL
ONLY
CAUTION
To
convert
the
unit
to
a
different
power
source
voltage,
DISCONNECT
POWER
SUPPLY
CORD
FROM
AC
change
the
position
as
illustrated
in
the
drawing
below.
OUTLET
BEFORE
CONVERTING
VOLTAGE.
Voltage Conversion Chart
VOLTAGE
SELECTOR
Note
on
safety:
Symbo!
A\
Fire
or
electrical
shock
hazard.
Only
orignal
parts
should
be
used
to
replace
any
part
marked
with
symbol
A\
.
Any
other
component
substitution
(other
than
original
type),
may
increase
risk
of
fire
or
electrical
shock
hazard.

Marantz SC-8 Specifications

General

Brand	Marantz
Model	SC-8
Category	Amplifier
Language	English