Marantz 3600 - Introduction to the Marantz Model 3600; Description and Operation; Phono;Mic Amplifier

INTRODUCTION
This manual was prepared for service personnel
in factory-authorized warranty repair stations
and other equally-qualified and equipped service
_centers. The service information contained here-
in is applicable to the Model 3600 Stereo Control
Console, a stereo preamplifier manufactured by
-the Marantz Company, Inc., a subsidiary of
Superscope Incorporated, Sun Valley, California
91352.
Performance evaluation tests and service of the
Model 3600 should be undertaken only by the
experienced technician, one knowledgeable in
solid-state preamplifier operation and the use of
sensitive test equipment. All instructions should
be read carefully and understood fully before
proceeding with any service or repair. To better
understand the functions of this preamplifier
refer to the Simplified Block Diagram, Figure 1,
the Schematic Diagram, Figure 2, the Wiring
Diagram, Figure 3, and the paragraphs under
Description and Operation.
As the Marantz Company learns of service and
repair difficulties, supplementary Technical Ser-
vices Bulletins will be sent to all service and repair
facilities. To improve this service continually,
all service and repair problems should be commu-
nicated to the Technical Services Manager at our
corporate headquarters.
DESCRIPTION AND
OPERATION
This section is included to assist the service tech-
_nician in understanding the operation of the
Model 3600 Stereo Contro! Console. The techni-
cal data describe the basic operating principles of
. the Model 3600. The following circuit descrip-
tions will be based on the left channel only as the
right channel operates identically.
A. PHONO/MIC AMPLIFIER
High- or low- level inputs selected by the Program
Selector Pushswitches are applied in accordance
with signal level. When low-level inputs are
selected (Phono or Mic), the Program Selector
Pushswitch applies the signal to the Phono/Mic
Amplifier and selects the proper equalization
(RIAA or Mic). The equalized signal is then re-
turned to the Program Selector Pushswitches
where it is handled as another high-level input.
High-level input signals (Tuner, Aux, Tape 1,
Tape 2, Dubbing In, or the equalized output of
the Phono/Mic Amplifier) are applied simulta-
neously to the Tape Monitor Switch, The Tape
Outputs, Dubbing Out Jack, and Scope Outputs.
The Tape Monitor Switch selects between the sig-
nal at the Program Selector Pushswitches (Source)
and the input at either Tape 1 or Tape 2. The
signal selected by the Tape Monitor Switch is
then applied to the Mode Switch.
The Mode Switch determines the manner in
which subsequent circuits process left- and right-
channel input signals. These include left channel
only, right channel only, two-channel stereo,
stereo reverse, or left and right channels combined
(L+R). The signal or combination of signals
selected by the Mode Switch is then applied to
the Balance Control. The Balance Control adjusts
the relative signal level of the left and right
channels by attenuating the level of one channel
while maintaining the level of the other.
From the Balance Control, the signal is applied to
the Volume Control, which varies the signal level
available at the preamplifier outputs. The signal
is also applied to the Loudness Contour Circuit
which, when activated, boosts low and high
frequencies at low listening levels so that all
frequencies appear to have equal loudness. The
signal from the Volume Control is applied to the
input of the Times-Ten (X10) Amplifier.