Marantz 3250 - Alignment Procedures

1. INTRODUCTION 2. P.W. BOARD
This
service
manual
was
prepared
for
use
by
Authorized
As
can
be
seen
from
the
circuit
diagram,
the
chassis
of
Warranty
Stations
and
contains
service
information
for
Model
3250
consists
of
following
units.
Each
unit
mount-
Marantz
Model
3250
Stereo
Control!
Console.
_
ed
on
a
printed
circuit
board
is
described
within
the
Servicing
information
and
voltage
data
included
in
square
enclosed
by
a
bold
dotted
line
on
the
circuit
this
manual
are
intended
for
use
by
knowledgeable
and
diagram.
experienced personnel only. All instructions should be
read
carefully.
No
attempt
should
be
made
to
proceed
Y
as
.
=
Te
pyogee
1.
Pre-Amp.
Ass’y.(Phono
Amp.,
without
a
good
understanding
of
circuitry
operation.
Tone
Amp.,
Power
Supply)
.
. .
.
.
mounted
on
P.W.B.
PJO1
The
parts
list
furnishes
complete
ordering
informa-
2.
Front
Panel
Ass’'y..:........
mounted
on
P.W.B.
PSO1
tion.
Most
replacement
parts
should
be
ordered
from
the
3.
Rear
Panel
Ass’'y
..........
.
mounted
on
P.W.B.
PVO1
Marantz
Company.
However,
a
simple
description
is
4.
Speaker
Switch
Ass’y
.......
.
mounted
on
P.W.B.
PWO1
included
for
parts
which
can
be
obtained
locally.
5.
Fuse
Ass'y...............
mounted
on
P.W.B.
PPO1
3. TEST EQUIPMENT REQUIRED FOR SERVICING
Table 1 lists the test equipment required for servicing the Model 3250 Stereo Control Console.
Manufacturer and Model No.
Sound Technology Model 1700B
Distortion measurements
Audio
Oscillator
Sinewave
and
squarewave
signal
source
AC
VTVM
Voltage
measurements
(AC)
.
Tektronix
Model
T932
Waveform
analysis
and
trouble
shooting
Fluke Model 8000 “Digital’’ Simpson
DC
VTVM
Model
313,
Triplet
Model
801
Voltage
measurements
(DC)
AC
Wattmeter
Simpson
Model
1379
Monitors
primary
power
to
amplifier
WO
Misia:
|
Commercial
Grade
(1-10A)
Monitors
amplifier
output
under
shortcircuit
condition
Line
Voltmeter
Simpson
Model
1359
Monitors
potential
of
primary
power
to
amplifier
Superior
Electronic
Co.,
Adjusts
level
of
primary
power
to
Powerstat
Model
116B
—
10A
amplifier
Use
phono
plug
with
600
ohm
Shorts
amplifier
input
to
eliminate
noise
across
center
pin
and
shell
pickup
Distortion Analyzer
Variable Autotransformer
Shorting Plug
4. ALIGNMENT PROCEDURES
1.
Set
the
VOLUME
control
at
maximum,
and
also
BASS,
MID,
TREBLE
and
BALANCE
Controls
at
mechanical
APPLICATION
center
position.
SIGNAL
INDICATOR
CONNECTION
CHECK
OF
THE
PHONO,
AUX,
TAPE
OUT,
TECHNICAL
SPEC.
TAPE
PRE
QUT
2.
Connect
47
kQ
dummy
load
resistor
to
each
R
and
L
channel
on
PRE
OUT
Jacks
of
the
unit.