Mark Levinson No 320-S Owners manual
Installation Instructions
& Release Notes
Nº 320S
Preamplifier
Phono Modules
The following general safety precautions must be observed during all phases of operation, service,
and repair of the component. Failure to comply with these precautions or with specific warnings
elsewhere in this document violates manufacturer safety standards and intended use of the
component. Mark Levinson assumes no liability for failure to comply with these requirements.
Ground the Instrument
To minimize shock hazard, the component chassis and cabinet must be connected to an electrical
ground. The component is equipped with a three-conductor AC power cord. The power cord must
be connected to either an approved three-contact electrical outlet or a three-contact-to-two-contact
adapter with the grounding wire (green) firmly connected to an electrical ground (safety ground)
at the electrical outlet. The power jack and mating plug of the power cord meet IEC (International
Electro-technical Commission) safety standards.
Do Not Operate in an Explosive Atmosphere
Do not operate the component in the presence of flammable gasses or fumes. Operation of any
electrical component in such an environment creates a definite safety hazard.
Keep Away from Live Circuits
Operating personnel must not remove component covers. Qualified maintenance personnel must
make component replacements and internal adjustments. Do not replace components when the
power cord is connected. Under certain conditions, dangerous voltages may be present even when
the power cord is disconnected. To avoid personal injuries, always disconnect the power cord and
discharge circuits before handling them.
Do Not Service or Adjust Alone
Do not attempt internal service or adjustment unless another person capable of rendering first-aid
resuscitation is present.
Do Not Substitute Parts or Modify Component
Because of the danger of introducing additional hazards, do not install substitute parts or perform
any unauthorized modifications to this component.
Dangerous Procedure Warnings
Warnings such as the example shown below accompany potentially dangerous procedures
throughout this document. Instructions contained in these warnings must be followed.
WARNING
• DANGEROUS VOLTAGES CAPABLE OF CAUSING DEATH ARE PRESENT IN THIS
COMPONENT. USE EXTREME CAUTION WHEN HANDLING, TESTING, OR ADJUSTING.
• DISCONNECT ALL POWER TO THE COMPONENT PRIOR TO INSTALLING THE PHONO
MODULES.
Safety Summary
ESD (Electrostatic Discharge)
Precautions
CAUTION
The following practices minimize possible damage to circuit board assemblies resulting from
electrostatic discharge or improper insertion:
• Keep circuit board assemblies in their original containers until ready for use.
• Avoid having plastic, vinyl, or Styrofoam in the work area.
• Wear an anti-static wrist strap.
• Discharge personal static before handling circuit board assemblies.
• Remove and insert circuit board assemblies with care.
• When removing circuit board assemblies, handle only by non-conductive surfaces. Never
touch open-edge connectors except at a static-free workstation*.
• Minimize handling of circuit board assemblies.
• Do not slide circuit board assemblies over any surface.
• Insert circuit board assemblies with the proper orientation.
• Use anti-static containers for handling and transporting circuit board assemblies.
* To make a static-free workstation, wash a plastic-laminated workbench with a solution of Lux
liquid detergent. Allow to dry without rinsing.
3
“Mark Levinson” and the Mark Levinson logo are registered
trademarks of Harman International Industries. U.S. patent
numbers and other worldwide patents issued and pending.
“Madrigal Audio Laboratories” and the Madrigal Audio
Laboratories logo are registered trademarks of Harman
International Industries. U.S. patent numbers and other
worldwide patents issued and pending.
©2004 Harman Specialty Group. All rights reserved.
This document should not be construed as a commitment on
the part of Harman Specialty Group. The information it
contains is subject to change without notice. Harman Specialty
Group assumes no responsibility for errors that may appear
within this document.
3 Oak Park
Bedford, MA 01730-1413 USA
Telephone: 781-280-0300
Fax: 781-280-0490
www.marklevinson.com
Customer Support
Telephone: 781-280-0300
Sales Fax: 781-280-0495
Service Fax: 781-280-0499
Product Shipments
16 Progress Road
Billerica, MA 01821-5730 USA
Part No. 070-630494 | Rev 0 | 02/04
4
Installation Instructions & Release Notes Mark Levinson
Table of Contents
Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . .5
Special Design Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Configuring & Installing the Phono Modules . . . . . . . . . . . . . .7
Configuration Instructions • Installation Instructions
Making Phono Input Connections . . . . . . . . . . . . . . . . . . . .14
Phono Input Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Name • Bal
Phono Module Specifications . . . . . . . . . . . . . . . . . . . . . . . .20
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5
Nº 320S Preamplifier Phono Modules Installation Instructions & Release Notes
Documentation
Conventions
This document contains hardware installation instructions and
software release notes for the Nº 320S Preamplifier Phono
Modules. Refer to the Nº 320S Preamplifier Owner’s Manual for
general safety, installation, and operation instructions.
Appears on the component to indicate the
presence of uninsulated, dangerous voltages
inside the enclosure – voltages that may be
sufficient to constitute a risk of shock.
Appears on the component to indicate
important operation and maintenance
instructions included in the accompanying
documentation.
Appears on the component to indicate
compliance of with the EMC (Electromagnetic
Compatibility) and LVD (Low-voltage
Directive) standards of the European
Community.
Calls attention to an ESD (electrostatic
discharge) procedure, practice, condition, or
the like that, if not correctly performed or
adhered to, could result in damage to circuit
board assemblies.
WARNING Calls attention to a procedure, practice,
condition, or the like that, if not correctly
performed or adhered to, could result in
personal injuries or death.
CAUTION Calls attention to a procedure, practice,
condition, or the like that, if not correctly
performed or adhered to, could result in
damage or destruction to part or all of the
component.
Note Calls attention to information that is
essential to highlight.
6
Installation Instructions & Release Notes Mark Levinson
Special Design Features
• Seamless Integration
When the phono modules are installed, the stereo input
connector labeled 7 becomes the phono input connector,
accepting input signals from most phono cartridges. As a result,
the phono modules benefit from all the high-performance
power supply and noise suppression features designed into the
Nº 320S, allowing them to deliver exceptional sound quality.
Each phono module relies on the same low-noise power supply
as the main audio circuits in addition to its own local, lownoise, high-speed voltage regulators.
• Flexible Configuration
Multiple loading and input gain options make the phono
modules compatible with most phono cartridges, including
moving-coil, moving-magnet, high-output, and low-output
designs. Three adjustable jumpers provide 200Ω or 47kΩ
resistive loading; 0 or 10nF capacitive loading; and 40 or
60dB input gain. Convenient gold-plated, solder-less screw
terminals accommodate custom loading.
• Balanced Design
Available on a proprietary Mark Levinson-designed stereo RCA
connector, the phono input provides the same common
mode noise rejection benefits as a balanced XLR connector.
The input gain stage produces a symmetrical pair of opposite
polarity signals, based solely on voltage differences present at
the input. Each balanced signal follows the same signal path,
including identical RIAA equalization.
• Instrumentation Amplifier Stage
Gain is distributed over two stages, allowing ample bandwidth
and open-loop gain for superior performance – even at the
60dB input gain required for moving-coil phono cartridges.
Introduced with the Nº 38, the instrumentation amplifier
stage resolves tiny electrical signals from potentially noisy
environments. This method offers high common mode noise
rejection without the limitations of transformer-based designs.
• Precise RIAA Equalization
A balanced pair of RIAA equalization circuits follows the input
gain stages. These circuits include a filter constructed with
0.5% non-inductive metal-film resistors and 2.5% stacked-film
capacitors as well as a subsonic filter below 10Hz for
uncompromised RIAA curve accuracy.
7
Nº 320S Preamplifier Phono Modules Installation Instructions & Release Notes
Unpacking
CAUTION
EXPOSURE TO STATIC ELECTRICITY MAY DAMAGE OR
DEGRADE THE PHONO MODULES. KEEP CIRCUIT
BOARD ASSEMBLIES IN THEIR ESD PROTECTIVE BAGS
UNLESS CONFIGURING OR INSTALLING. DO NOT
REMOVE CIRCUIT BOARD ASSEMBLIES FROM THEIR ESD
PROTECTIVE BAGS WITHOUT FOLLOWING ESD
PRECAUTIONS (PAGE 3).
When unpacking the phono modules:
• Save all packing materials for possible future shipping needs.
• Inspect the phono modules for signs of damage during shipment. If damage is discovered, contact an authorized Mark
Levinson dealer for assistance making the appropriate claims.
• Locate and remove all items from the packing carton. Contact
an authorized Mark Levinson dealer if the packing carton does
not include all of the items listed in the table below.
Item Quantity
Nº 320S Phono Modules 2
Anti-static wrist strap 1
1/8-inch hex-key 1
Flat-blade screwdriver 1
Configuring & Installing
the Phono Modules
The phono modules require special care and handling during
configuration and installation to ensure optimal performance. Pay
particular attention to precautions that appear in this section, as
well as to the Safety Summary (page 2) and ESD Precautions (page
3). Damage caused during configuration or installation may
void the manufacturer’s warranty and/or standard repair policies.
8
Installation Instructions & Release Notes Mark Levinson
Configuration The phono modules must be optimized to work with the associated
Instructions phono cartridge. Each phono module includes:
• 1 adjustable resistive load jumper
• 1 adjustable capacitive load jumper
• 1 adjustable input gain jumper
• 2 screw terminals that accommodate custom loads
These features are identified in the illustration shown below.
JUMPER SETTINGS
OPEN
CLOSED
C
L
=0nF
C
L
=10nF
R
L
=200
R
L
=47K
G=60db
G=40db
CUSTOM
TERMINATION
P10
JUMPER SETTINGS
OPEN
CLOSED
C
L
=0nF
C
L
=10nF
R
L
=200
R
L
=47K
G=60db
G=40db
CUSTOM
TERMINATION
P10
Each jumper can be OPEN or CLOSED, depending on the needs of
the associated phono cartridge. Select one setting for each jumper.
Refer to the illustrations shown below for recommendations.
When the phono modules are shipped, all
jumpers are CLOSED as shown in the illustration
above. In general, it is recommended to leave
all jumpers CLOSED for most low-output,
moving-coil phono cartridges.
The numbered items in the phono module illustration shown above correspond with the
numbered items that begin on the next page. The left and right-channel phono modules
are identical.
In general, it is recommended to OPEN all
jumpers for most high-output, moving-magnet
phono cartridges.
JUMPER SETTINGS
OPEN
CLOSED
C
L
=0nF
C
L
=10nF
R
L
=200
R
L
=47K
G=60db
G=40db
CUSTOM
TERMINATION
No.320S PHONO
P10
2
4
13
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