Equipment information:

Marantz 4270 Receiver
Manufacturer:
Marantz
Model: 4270
Date:
Category: Audio, Video, TV, Multimedia
Group: Receiver
Description: Stereo 2+ Quadradial 4 Receiver
Information:
                                    Your Marantz Model 4270 is a high-quality Stereo 2 +
Quadradial 4 Receiver developed by Marantz, a name famous
for quality in the audio component industry. The Model 4270
incorporates Marantz' exclusive Vari-Matrix circuit which
simulates 4-channel sound from normal 2-channel stereo
programs, and is capable of reproducing 4-channel sound from
any matrix-encoded source. The 4270 will also reproduce any
discrete 4- channel program as well as regular stereo and
monaural programs. An optional plug-in decoder adapts the
4270 for any specific matrix system such as Columbia's SQ.
The FM tuner section employs an FET for the RF amp and Mixer
stage. The IF tuning circuit employs ceramic filters of wide
bandwidth and high selectivity to provide high sensitivity
and unparalleled interference-free operation. The 4270
incorporates a switchable 2-channel DOLBY system to reduce
noise, inherent in recording music from records, tape, FM
broadcasts and TV.
The FM multiplex circuitry includes a phase locked loop
Stereo-Monaural Automatic switching circuit, stereo
indicator circuit and a buffer amplifier to obtain output at
low impedance. Low pass filters for 19KHz and 3SKHz
rejection are incorporated. Moreover, the Model 4270 unit
has a muting circuit that permits pleasant FM broadcast
reception by completely eliminating inter-station
interference which is usually generated at the time of
selecting FM stations.

TECHNICAL SPECIFICATIONS
FM SECTION:
Tuning Frequency
Range...............................................................................................
88 — 108 MHz
IHFM Usable
Sensitivity..............................................................................................................23μ/
I HF
Selectivity...............................................................................................................................60
dB
Capture
Ratio...............................................................................................................................1.6
dB
Image Rejection Ratio at 106
MHz............................................................................................70
dB
Signal to Noise Ratio (Mono)
.....................................................................................................70
dB
Signal to Noise Ratio (Stereo)
...................................................................................................60
dB
Total Harmonic Distortion
(Mono)...............................................................................................0.2%
Total Harmonic Distortion
(Stereo)...............................................................................................0.3%
Frequency Response (ref. 75μ sec.
de-emphasis)........................................30 Hz to
15 KHz, ± 1 dB
Stereo Separationat 1
KHz..........................................................................................................40
dB
Quadradial Output (400 Hz 75 KHz
dev.)...............................................................................300mV
AM SECTION:
Tuning Frequency
Range..........................................................................................
540 — 1605 KHz
Usable Sensitivity
.........................................................................................................................
30μν
Selectivity.....................................................................................................................................26
dB
Image Rejection Ratio at 1400
KHz..........................................................................................70
dB
Signal to Noise Ratio
..................................................................................................................45
dB
Frequency Response (—6 dB)
.................................................................................50
Hz to 3.5 KHz
Total Harmonic Distortion
................................................................................................................1%
AUDIO SECTION:
Input Impedance — Low level
input......................................................................Phono
47K ohms
— High level
input.................................................................................100K
ohms
I nput Sensitivity —
Phono.............................................................................2.2mV
for 25W output
— High
level.........................................................................150mV
for 25W output
Frequency Response
...........................................................................+1.0
dB, 20 Hz to 20 KHz at
1W output
Intermodulation
Distortion...........................................................................
Less than 0.3% at rated
power output
Total Harmonic Distortion
.............................................................................Less
than 0.3% at rated
power output
Damping Factor
............................................................................................More
than 45 at 8 ohms
Total Noise — From magnetic phono
input............................................Less than
2μ/ equivalent
to power amp output input noise at 8 ohms rated
power output
Volume
Tracking...........................................................................................................
Less than 4 dB
Rated Continuous (RMS)
Output...............................................................................25Wat8ohms
all channels operating simultaneously at 40 Hz to 25W at 4
ohms 20 KHz for nominal harmonic distortion 13W at 16 ohms
Comparable Total Music
Power.................................................................................150W
at 8 ohms
GENERAL:
Power Requirements
120 V
Power Consumption — at rated power output, all
channels.................................................. 400W
— idling (no
signal).................................................................................45W
Dimensions — Panel
Width...................................................................................17-21/64
Inches
— Panel
Height...................................................................................
5-25/64 Inches
— Depth
................................................................................................14-3/8
Inches
— Width (Packed for
Shipment)............................................................22-1/4
Inches
— Height (Packed for
Shipment)..........................................................10-1/2
Inches
— Depth (Packed for
Shipment)..........................................................19-1/2
Inches
Weight — Unit
alone..........................................................................................................40.2
lbs
— Packed for
Shipment..........................................................................................
49.1 lbs

These manuals are available for the above equipment:

Marantz -- 4270 -- Service Manual
File name: Marantz-6620-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 49
Size: 13.94 Mbytes (14619718 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 196c326b011d8307df74be8ec67d1b93
ed2kID: 65217ec1b0fb6345d33004160d721d00
Downloads: 61 since 08 March 2015
Information:
Introduction
.........................................................................................................................
1
Service Notes
.........................................................................................................................
1
AM Tuner
.............................................................................................................................
1
FM Tuner
.............................................................................................................................
2
Phono and
Pre-Amplifier........................................................................................................
5
Dolby
Unit............................................................................................................................
6
400HzTone............................................................................................................................
6
Dolby Switch
.........................................................................................................................
7
Record Level (L) (R)
...........................................................................................................
7
Dolby FM Preset Level
Controls............................................................................................
7
400Hz Tone
Switch................................................................................................................
7
FM De-Emphasis
Switch........................................................................................................
7
Power
Amplifier....................................................................................................................
8
BTL (Balanced Transformer-Less)
Connection.....................................................................
8
Power Supply
Unit................................................................................................................
8
Audio Trouble Analysis
........................................................................................................
8
Test Equipment Required for Servicing
...............................................................................
9
AM Alignment Procedure
....................................................................................................
9
FM Alignment Procedure
....................................................................................................
10
Audio Adjustment
................................................................................................................
11
Automatic Voltage Regulator Adjustment
...........................................................................
11
Dolby Alignment Procedure
................................................................................................
11
Alignment Procedures of Dolby FM Preset Level
Controls.................................................. 12
Explanation of the Dolby Processing Chart
.......................................................................
12
Parts List
........................................................................................................................28~43
Technical Specifications
....................................................................................................44,45

This service manual was prepared for use by Authorized
Warranty Stations and contains service information for
Marantz Model 4270 Stereo 2 + Quadradial 4.
Servicing information and voltage data included in this
manual are intended for use by the knowledgeable and
experienced technician only. All instruction should be read
carefully. No attempt should be made to proceed without a
good understanding of the operation in the receiver.
The parts list furnish information by which replacement part
may be ordered from the Marantz Company. A simple
description is included for parts which can be usually be
obtained through local suppliers.
Marantz-6620-Manual-Page-1-Picture
Start Free Download


Marantz -- 4270 -- User Manual
File name: Marantz-6633-Manual-Page-1-Picture
Manual Type: User Manual
Pages: 24
Size: 13.13 Mbytes (13769629 Bytes)
Language: english
Revision:
Manual-ID/Number: 288985101-0
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 4546444936fd89b1b749cc2e1107adf3
ed2kID: f9b23c36a6a539481cea3b85f3d2df8d
Downloads: 39 since 26 April 2015
Information:
Connecting the 4270 Source Devices Remote Speakers Speaker
Phasing Speaker Placement
Front Panel Features Mode Switch Dimension SQ Decoder
Balance Controls Selector Switch Bass, Mid and Treble
Controls Monitor Switch for Tape 1/Tape 2 Monitor Switch for
Tape/Source Main and Remote Spkr Switches Power Switch
Front and Rear Phones Jacks
Loudness
Hi Filter Switch
Tuning Meter
Tuning
FM Muting Switch Volume Dolby Switch Record Level (L) (R)
Play Cal. (L) (R)
400Hz Tone Switch
Rear Panel Features Phono Jacks CD-4/AUX Jacks
Tape Monitor In and Tape Monitor Out Jacks
FM Antenna Terminals
AM Antenna Terminal
FM Quadradial Output Jack
FM De-Emphasis Switch
Dolby FM Preset Level Controls
Muting Level Control
Power Mode Switch
Pre Out, Main In Jacks
Connecting an External Amplifier for
Rear Channels
Connecting an External Amplifier for
Front Channels
Chassis Ground Binding Post
Main and Remote Speakers
Connection to AC Outlet
AC Convenience Outlets
Remote Control
Marantz-6633-Manual-Page-1-Picture
Start Free Download


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