Marantz 4100 - Service Notes; Selector Switch; Mode Switch

INTRODUCTION
This
service
manual
was
prepared
for
use
by
Authorized
Warranty
Stations
and
contains
service
information
for
Marantz
Model
4100
Solid-State
Quadradial
Console
Amplifier.
Servicing
information
and
voltage
data
included
in
this
manual
are
intended
for
use
by
the
knowledgeable
and
experienced
technician
only.
All
instruction
should
be
read
carefully.
No
attempt
should
be
made
to
proceed
without
a
good
understanding
of
the
operation
in
the
circuits.
The
parts
list
furnish
information
by
which
replacement
part
may
be
ordered
from
the
Marantz
Company.
A
simple
description
is
included
for
parts
which
can
usually
be
obtained
through
local
suppliers.
1. SERVICE NOTES
As
can
be
seen
from
the
circuit
diagram
the
chassis
of
Model
4100
consists
of
the
following
units.
Each
unit
mounted
on
a
printed
circuit
board
is
described
within
the
square
enclosed
by
a
bold
dotted
line
on
the
circuit
diagram.
1.
Tape
Mon.,
High
Filter
Unit........-..--2.000--
mounted
on
P.W.
Board,
P250
2.
Main-Remote
Speaker
Switch
Unit
..............
mounted
on
P.\W.
Board,
P300
3.
Loudness
Unit
.......
0...
cece
ee
eee
ene
mounted
on
P.W.
Board,
P350
4.
Tone
Amplifier...
0.0...
ccc
eee
eee
eee
mounted
on
P.W.
Board,
P400
6.
Vari
Matrix:
Uniti
nc
ciccdsecnae
cc
2
ee
wader
ee
mounted
on
P.W.
Board,
P500
6.
Meter
Rectifier
Unit...............06-
Disha
amcetals
mounted
on
P.W.
Board,
P550
7.
Temperature
Compensation
Unit..............-.
mounted
on
P.W.
Board,
P580
8.
Power
Amplifier
........
00.
e
eee
eee
ee
renee
mounted
on
P.W.
Board,
P600
9.
Function
Indicator
Unit
..........
2002
eee
eee
mounted
on
P.W.
Board,
P650
10.
Phono
Equalizer
Amplifier
............00500e-
mounted
on
P.W.
Board,
P700
11.
Tone
Control
Unit
........
2...
cc
eee
eee
eee
mounted
on
P.W.
Board,
P750
12.
Power
Supply
.......00
cece
scene
cee
sect
eeens
mounted
on
P.W.
Board,
P800
13.
AC
Rectifier
.......2..0000eeee-
nahctid
ashe
Ness
mounted
on
P.W.
Board,
P850
14.
Balance
Variable
Resistor
Unit..............006-
mounted
on
P.W.
Board,
P900
2. SELECTOR SWITCH
-
Signals
from
the
PHONO
jacks
are
applied
to
the
phono-amplifiers
and
equalized
to
match
the
RIAA
curve
for
flat
frequency
response.
The
outputs
of
the
phono-amplifiers
and
signals
from
the
TUNER,
TAPE
1,
2
and
AUX
jacks
are
led
to
the
SELECTOR
switch,
S001.
The
SELECTOR
switch
selects
one
set
of
signals
from
PHONO,
TUNER,
TAPE
1,
2
and
AUX
jacks
and
sends
them
to
the
TAPE
MONITOR
switch
and
TAPE
OUT
jacks.
The
selected
signals
are
then
applied
to
the
MODE
switch,
SOO2.
PHONO
and
TUNER
jacks
are
for
2-channel
input
signals,
that
is
stereo
signals.
AUX,
TAPE
1,
2
and
TAPE
OUT
jacks
are
4-channel,
that
is
quadraphonic
signals.
3. MODE SWITCH
MODE
switch
S002
has
positions
of
MONO,
2
CH,
DISCRETE,
VARI-MATRIX
and
SQ
DECODER.
In
the
MONO
position
all
input
signals
are
mixed
together
and
delivered
to
all
four
channels.
In
the
2
CH
position
stereo
signals
are
directly
routed
to
the
pair
of
front
left
(LF)
and
front
right
(RF)
channels;
the
same
signals
at
the
LF
and
RF
channels
are
fed
to
the
rear
left
(LR)
and
rear
right
(RR)
channels,
respectively.
When
quadraphonic
signals
are
applied
to
the
input
terminals,
the
LF
and
LR
signals
and
RF
and
RR
signals
are
separately
added,
thus
the
(LF
+
LR)
signal
is
delivered
to
the
LF
and
LR
channels
and
the
(RF
+
RR)
signal
is
delivered
to
the
RF
and
RR
channels.
In
the
DISCRETE
position
the
quadraphonic
input
signals
are
separately
routed
as
4-channel