Marantz 2252 Owners Manual

Model 2252

Stereop hon ic

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MARANTZ CO., INC. 20525 NORDHOFF STREET, CHATSWORTH, CALIFORNIA 91311

A WHOLLY-OWNED SUBSIDIARY OF SUPERSCOPE INC., CHATSWORTH, CALIFORNIA 91311

Receiver

FOREWORD

GENERAL DESCRIPTION

For optimum performance and enjoyment from
your Model 2252 Stereo Receiver, please study

these instructions carefully. Installation and
operation are not complicated, but its flexibility
and features deserve your becoming familiar with

its controls and connections.

This manual is divided into two parts. The first

covers installation and operation in simple, non-
technical language.The second describesthe 2252

in more detail with technical specifications and
functional explanations.

For quick identification of the controls and con-

nections, referencesto them are printed in BOLD-

FACE TYPE, exactly as they appear on the front

and rear panels of your Receiver.

The Marantz Model 2252 is an all solid state
receiver incorporating the innovative design and

unparalleled technology that have made Marantz
famous in the audio component industry.
The Model 2252 features a sensitive stereo FM

tuner, a highly selective AM tuner, and a low dis-
tortion preamplifier and amplifier on a single
chassis.The FM tuner features a front end which

employs a dual gate MOSFET and FM IF unit, a

phase locked loop multiplex decoder and an AM

tuner, all of which utilize IC's throughout. The
amplifier sections permit the connection of two
stereo pairs of loud-speakers, a turntable or

record changer, two tape recorders, stereo head-
phones, and an auxiliary source such as an addi-

tional tuner or a TV sound source.

AC Line Operation

WARNING: TO PREVENT FIRE OR SHOCK HAZARO, 00

NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

AFTER UNPACKING

It is advisable to retain all original packing mate-
rial to prevent damage should you wish to trans-
port or ship the Model 2252 (refer to page 14 for

repacking and shipping instructions). Be careful
that you do not inadvertently throwaway or lose
the parts packed with the unit.

Pleaseinspect your Model 2252 carefully for any
signs of shipping damage. Our very strict quality
control and professional pride ensure that each

Model 2252 left the factory in perfect condition.

If the unit is damaged or fails to operate, imme-
diately notify your dealer. If the unit wasshipped
to you directly, notify the transportation com-

pany without delay. Only you, the consignee,
may institute a claim against the carrier for ship-

ping damage. Save the carton and all packing
material as evidence of damage for their inspec-
tion. Should assistance be required, the Marantz

Company will cooperate fully in assisting your
claim.

Pleasefill out and mail the Warranty Registration

Card within ten days of purchase. The card will

remain on file at the Marantz Company for the
duration of the warranty period. We also strongly
advise that you retain your sales receipt to pro-
vide proof of purchase in the event that warranty
service is sought.

Volume Control

Fuse Replacement

FM Fron End

Cleaning

Mono Functions

Control Circuits

Speaker Phasing

In Case of Difficulty

Service Notes

FM Stereo Demodulator

AM Tuner

Selector Switch

General Specifications

Tape Recording and Dubbing

Recording

Amplifier

Repacking for Shipment

Recording Dolbyized FM Programs

Dubbing

Technical Description

Tape 1 Monitor Switch

Muting Circuit

Repairs

Phono EO Amplifier

FM IF Amplifier

TABLEOFCONTENTS

11

11

11

1

2

1

2

14

4

3

8

3

6

4

11

5

5

1

1

5

1

4

5

7

7

7

7

8

8

8

3

3

9

9

9

9

9

9

6

6

6

6

14

6

6

7

7

2

5

5Maintenance

11

1

14

8

8

8

8

9

9

6

6

6

7

1General

liST OF IllUSTRATIONS

1. Rear Panel Connection Facilities 1

2. AM/FM Antenna Connection 2

3. AM Ferrite-rod Antenna 2

4. Loudspeaker System Connections 3

5. Front Panel Controls and Jack 5

6. Stereophone Plug 6

7. Functional Block Diagram 10

8. Packing Instructions 14

PREPARATION FOR USE

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Figure 1. Rear Panel Connection Facilities

REAR PANEL CONNECTIONS

Figure 1 shows the location of input and output

jacks on the rear panel. These jacks are for "per-
manent" connections. Front panel jacks and their
usewill be discussedlater.

All connections to the rear panel should be made
with the power to the entire system turned off.
The rear panel signal connections are arranged in
stereo pairs. All signal connections to the Model
2252, with the exception of the FM antenna and

loudspeakers, should be made with shielded audio
cables. To avoid confusion, connect one cable at
a time between the 2252 and the other compo-

nents of your system. This is the safest way to
avoid cross-connecting channels or confusing
signal sources with destinations.

PHONO INPUTS

The phono jacks are intended for use with mag-

netic phono cartridges and have a 47,000 ohm

input impedance.

If a hum is heard when playing records, this is an

indication that the record player or its connec-
tions are incorrectly grounded. Connect a sepa-

rate ground wire from the turntable or record
changer from to the CHASSIS GROUND binding
post of the Model 2252. If this is ineffective, try

reversing the polarity of the turntable's power
plug.

If hum persists, consult the instruction booklets
for the turntable and/or phono cartridge.

TAPE JACKS
TAPE 1 IN

The pair of TAPE 1 IN jacks servetwo purposes:

1. By depressing the TAPE 1 MONITOR push-
switch, signals can be played from a tape re-
corder set for playback mode of operation.
This permits playing the tape source stereo-

phonically or monophonically as indicated by
the position of the MONO pushswitch.

2. While your tape recorder is recording, you can
monitor the resulting tape quality by depress-
ing the TAPE 1 MONITOR pushswitch. This
requires that your recorder be equipped with
separate record and playback heads and sepa-

rate record and playback electronics.

TAPE 2 IN

The signals from your tape recorder connected to
the TAPE 2 IN jacks can be played back when the
SELECTOR switch is placed in the TAPE 2 posi-

tion and the TAPE 1 MONITOR switch is re-

leased. In addition, these jacks allow tape copying
from TAPE 2 to TAPE 1. The resulting recording
can be monitored by depressing the TAPE 1

MONITOR pushswitch.
TAPE 1

Connecting these jacks to the line inputs of a
tape recorder permits recording from the program
source indicated by the SELECTOR switch. The

& 2 OUT

"'i"d1

75·ohm

coaxial cable
without

"F" connector

Figure 2. AM/FM Antenna Connection

signals available at this pair of jacks are not
affected by the BALANCE, VOLUME, TREBLE,

BASS, HI FILTER, LOUDNESS, and MONO
pushswitches on the front panel.

AUX INPUTS

The AUX INPUT jacks are for miscellaneous high

level signal sources such as additional tuners
and/or receivers, tape players, phonographs that

provide RIAA equalized high level output, TV
sound outputs and other external components.

FM ANTENNA
The best FM reception is obtained with a Log-

Periodic type antenna mounted on a good quality
rotor system. For fringe areas, Marantz recom-
mends a Log-Periodic antenna with six or more
elements designed expressly for FM reception.
To minimize local noise and multipath picked up
by the lead-in wires, use a balanced and shielded

300 ohm cable or a coaxial 75 ohm cable with a

300 to 75 ohm matching transformer at the

antenna. Unshielded lead-in acts as an omni-
directional antenna, and can cancel the direc-

tional benefits of your antenna. Low-loss 300
ohm shielded cable consists of two inner conduc-

tors plus an outer shield and insulating jacket.
This type of shielded cable effectively prevents
the lead-in from contributing multipath distor-
tion.

For rural areas, it is recommended that a local

dealer be consulted about antenna installation
and lightning arrestor protection. Master antenna

systems are not recommended for use with your.

Figure 3. AM Ferrite-rod Antenna

Model 2252; such systems are usually designed
expressly for television reception and frequently

suppress FM signals before distribution. In addi-
tion, master antenna systems often severely re-
duce the quality of the FM signal. Where outdoor
antennas are prohibited or inconvenient, place the
antenna in vacant attic space or use asimple 300
ohm TV "rabbit ear" antenna or the ribbon-type
folded dipole antenna supplied with the Model

2252. Both are practical and will give satisfactory

results in primary signal areas.
Figure 2 shows connection methods for various

antennas. If 75-ohm cable is desired, we recom-
mend using the type with an "F"-type connector

terminal attached to the cable. This is the easiest

type of cable to connect and disconnect.

AM ANTENNA
Your Tuner is equipped with an AM ferrite-rod

antenna. BEFORE USING THE MODEL 2252,
SWING THE ANTENNA OUT AS SHOWN IN

FIGURE 3.
The ferrite-rod antenna will give you satisfactory
results in primary signal areas. However, an out-

door antenna will provide better reception in
weaker signalareas.Three single wires are required

to make an AM outdoor antenna. First, connect

one end of a single wire to the AM ANTENNA
terminal on the rear panel, and the other end to a
very high horizontal antenna wire of 25 to 75 feet
in length suspended between insulators in an out-
door location (the higher the better). Next, con-
nect the third single wire between the

"G"

terminal of your Model 2252 and an authenti-
cated earth ground (such as a metal water pipe).

2