Marantz 3250B - Introduction to Service Manual; P.W. Board Component Units; Required Servicing Test Equipment

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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
Modei
32508
consists
of
following
units.
Each
unit
Marantz
Model
3250B
Stereo
Control
Console.
|
mounted
on
a
printed
circuit
board
is
described
within
the
Servicing
information
and
voltage
data
included
in
this
square
enclosed
by
a
bold
dotted
line
on
the
circuit
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
1.
Tome-Amp.,
ASS'Y
......ccccecceccsssensecneees
mounted
on
P.W.B.PJ
01
without
a
good
understanding
of
circuitry
operation.
2.
Tone
Control,
Filter
Ass’y
.....csee
mounted
on
PW.B.
PS
01
The
parts
list
furnishes
complete
ordering
information.
3.
Input
Terminal
Ass’y
.........ccesseceeees
mounted
on
P.W.B.
PV01
Most
replacement
parts
should
be
ordered
from
the
4.
Speaker/Headphone
Ass’y
.............4
mounted
on
P.W
.B.
PWO1
Marantz
Company.
However,
a
simple
description
is
Buse
ASS
V
eisccadin
tics
cvnde
doa
evnenssnvanseaans
mounted
on
PW
.B.
PP
01
included
for
parts
which
can
be
obtained
locally.
6.
Loudness
Control
ASs’y
«...esesesesees
mounted
on
P.W.B.
PF
01
3.
TEST
EQUIPMENT
REQUIRED
FOR
SERVICING
Table
1
lists
the
test
equipment
required
for
servicing
the
Model
3250B
Stereo
Control
Console.
Distortion
Analyzer
Distortion
measurements
Audio
Oscillator
Sinewave
and
swuarewave
signal
source
AC
VTVM
Voltage
measurements
(AC)
Sound
Technology
Model
1700B
Tektronix Model T932
Philips Mode! 3232
Oscilloscope
Waveform
analysis
and
trouble
shooting
Trouble shooting
Circuit
Tester
Fluke
Model
8000
‘‘Digital’’
Simpson
Model
313,
Triplet
Model
801
Simpson Model 1379
DC
VTVM
Voltage
measurements
(DC)
Monitors
primary
power
to
amplifier
M
AC
Wattmeter
onitors
amplifier
output
under
short
Circuit
condition
AC
Ammeter
Commercial
Grade
(1-10A)
Monitors potential of primary power to
amplifier
Line
Voltmeter
Simpson
Model
1359
Adjusts level of primary power to
amplifier
Superior Electronic Co.,
Powerstat Mode! 116B —10A
Use phono plug with 600 ohm
across center pin and shell
Variable
Autotransformer
Shorts
amplifier
input
to
eliminate
noise
Shorting Plug pickup