Marantz 3650 - Introduction; P.W. Board Component Overview; Test Equipment for Servicing

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1.
INTRODUCTION
This
service
manual
was
prepared
for
use
by
Authorized
Warranty
Stations
and
contains
service
information
for
Marantz
Mode!
3650
Stereo
Control
Console.
Servicing
information
and
voltage
data
included
in
this
manual
are
intended
for
use
by
knowledgeable
and
experienced
personnel
only.
All
instructions
should
be
read
carefully.
No
attempt
should
be
made
to
proceed
without
a
good
understanding
of
circuitry
operation.
The
parts
list
furnishes
complete
ordering
informa-
tion.
Most
replacement
parts
should
be
ordered
from
the
Marantz
Company.
However,
a
simple
description
is
included
for
parts
which
can
be
obtained
locally.
3.
TEST
EQUIPMENT
REQUIRED
FOR
SERVICING
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2. P.W. BOARD
As can be seen from the circuit diagram, the chassis of
Mode! 3650 consists of following units. Each unit mount-
ed on a printed circuit board is described within the
square enclosed by a bold dotted line on the circuit
diagram.
1. PhonoAmp .........06+8 mounted on P.W.B. P400
2. PowerSupply ......-.-6. mounted on P.W.B. P800
3. PreAmp .......2.2250005 mounted on P.W.B. PEOO
4. Volume Buffer ........... mounted on P.W.B. PGOO
5. SelectorSwitch .......... mounted on P.W.B. PJOO
6. ToneVR .......-2. 0008 mounted on P.W.B. PFOO
Ts TopeEQ. 6's ce eee es mounted on P.W.B. PKOO
8. Tone VRConnector........ mounted on P.W.B. PFO1
9. Cartridge Load .......-...4- mounted on P.W.B. PLOO
10. Loudness ......... eee mounted on P.W.B. P600
11. MC Amp ......-+-2.-002- mounted on P.W.B. PM01
12. “ROA PIN 3. oe ee ee ae ees mounted on P.W.B. PV00
13. SpeakerSwitch .......... mounted on P.W.B. PW0OO
Table
1
lists
the
test
equipment
required
for
servicing
the
Model
3650
Stereo
Control
Console.
Distortion
Analyzer
Audio
Oscillator
AC
VTVM
Oscilloscope
DC VTVM
AC Wattmeter
AC Ammeter
Line Voltmeter
Variable
Autotransformer
Shorting Piug
Superior Electronic Co.,
Powerstat Model 116B — 10A
Use phono plug with 600 ohm
across center pin and shell
Manufacturer and Model No.
Sound Technology Mode! 1700B
Tektronix
Model
T932
; :
Philips
Model
3232
Waveform
analysis
and
trouble
shooting
Fluke Model 8000 ‘‘Digital’”’ Simpson
Model 313, Triplet Model! 801
Simpson
Model
1379
Monitors
primary
power
to
amplifier
;
:
Monitors
amplifier
output
under
short
circuit
Commercial
Grade
(1-10A)
eondition
:
Monitors
potential
of
primary
power
to
Simpson
Model
1359
amplifier
Distortion measurements
Sinewave and squarewave signal source
Voltage measurements (AC)
Trouble shooting
Voltage measurements (DC)
Adjusts level of primary power to
amplifier
Shorts amplifier input to eliminate noise
pickup