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Crown Micro-Tech 601 User Manual

Crown Micro-Tech 601
39 pages
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ODEP
CH1 CH2
POWER
OFF
ODEP
CH1 CH2
POWER
OFF
Models:
Micro-Tech 600, 1200 & 2400
Micro-Tech 601, 1201 & 2401
Some models may be exported under the name
Amcron
.
®
102990-1
7/97
© 1997 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000.
Fax: 219-294-8329. Micro-Tech amplifiers are produced by the Professional Audio Division of Crown
International, Inc. Trademark Notice:
Grounded bridge
is a trademark and
Amcron
,
®
Crown
,
®
Techron
,
®
Micro-Tech
,
®
ODEP
®
and
TEF
®
are registered trademarks of Crown International, Inc. Other trademarks are
the property of their respective owners.
®
®
Commercial
Audio
LL 32521C
(MT-600 & 1200)
120 VAC North
American
Units Only:
Commercial
Audio
E106377
(MT-600 & 1200)
Approved for
THX Theatre
Systems
(MT-600 & 1200)
®
For
Canada
(MT-2400)

Table of Contents

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Crown Micro-Tech 601 Specifications

General IconGeneral
BrandCrown
ModelMicro-Tech 601
CategoryAmplifier
LanguageEnglish

Summary

Worldwide Warranty Summary

Items Excluded From Warranty

Details warranty exclusions like misuse, accidents, negligence, and serial number tampering.

What the Warrantor Will Do

Crown will remedy defects through repair, replacement, or refund, shipping product within a reasonable time.

How to Obtain Warranty Service

Notify Crown within 90 days of warranty expiration; ship components in factory pack for corrective action.

Disclaimer of Consequential Damages

Excludes recovery for incidental or consequential damages resulting from product defects.

Warranty Alterations

No person can enlarge or modify the warranty; time deprived of use doesn't extend warranty period.

Design Changes

Crown reserves the right to change product designs without notice or obligation for prior units.

Legal Remedies of Purchaser

Legal action must commence within 90 days of warranty expiration.

Important Safety and Technical Notes

Electrical Wiring Requirements

Specifies Class 1 wiring for MT-2400 and Class 2 for MT-600/1200 output wiring.

Electrical Shock Precautions

Warns against opening covers and refers servicing to qualified personnel; disconnect power before access.

Weather Exposure Warning

Advises against exposing equipment to rain or moisture to reduce electric shock risk.

Magnetic Field Considerations

Caution about locating sensitive equipment near the amplifier due to its magnetic field.

Symbol Identification

Explains lightning bolt (electric shock risk) and exclamation point (important instructions) symbols.

1 Welcome

1.1 Unpacking

Instructions for unpacking, inspecting for damage, and saving packing materials for future transport.

1.2 Features

Highlights key features like ODEP protection, grounded bridge design, low distortion, and three-year warranty.

2 Facilities

Filter Grille

Protects the dust filter; requires removal of screws for cleaning.

Dust Filter

Removes particles from air; requires regular checking to prevent clogging.

ODEP Indicators

Amber indicators show reserve energy; dim or turn off when reserves decrease or protection limits output.

Enable Indicator

Amber indicator shows the unit is on, AC power is available, and cooling system is operational.

Power Switch

Rocker switch to turn the amplifier on/off; includes a ~4-second turn-on delay.

Power Cord

Details shipped power cord and plug for AC voltage; refers to Section 7 for usage.

Stereo/Mono Switch

Controls three operating modes: Stereo, Bridge-Mono, and Parallel-Mono.

Reset Switches (Micro-Tech 2400 only)

Push-button switches on the back panel to reset high-voltage power supply circuit breakers.

3 Installation

3.1 Mounting

Designed for standard 19-inch rack mounting or stacking; recommends support for back panel if rack is transported.

3.2 Cooling

Details internal fan operation and tips for maintaining optimal cooling, including air flow and vent clearance.

3.3 Wiring

Details various wiring configurations for sound systems, covering signal input and output connections.

3.3.1 Stereo (Two-Channel) Operation

Explains intuitive stereo wiring where input channel 1 feeds output channel 1, and channel 2 feeds channel 2.

3.3.2 Bridge-Mono Operation

Used for loads >= 4 ohms; requires specific wiring where channel 1 input is used and channel 2 is inverted.

3.3.3 Parallel-Mono Operation

Used for loads < 4 ohms; requires specific wiring with channel 1 input and a jumper between positive output posts.

3.3.4 Input Connection

Details balanced and unbalanced input wiring for phone jacks and optional accessories like MT-XLR/MT-BB.

3.3.5 Output Connection

Discusses connecting loads considering power handling capacity and recommends loudspeaker protection fuses.

3.3.6 Additional Load Protection

Explains using fuses to protect loudspeakers from thermal damage and transient voltages.

3.4 AC Mains Power Requirements

Details AC power cord and plug requirements by country and discusses proper AC mains connection.

4 Operation

4.1 Precautions

Lists precautions for safe operation, including proper wiring, switch settings, and connection practices.

4.2 Indicators

Explains the function of the Enable and ODEP indicators on the front panel.

4.3 Protection Systems

Overview of the amplifier's protection features including ODEP, RF, drive, and thermal protection.

4.3.1 ODEP

Details Crown's patented Output Device Emulation Protection circuitry for reliability and efficiency.

4.3.2 Ultrasonic and Radio Frequency Protection

Explains controlled slew rate protecting against RF and undesirable frequencies, protecting loads.

4.3.3 Drive Protection

Describes how drive protection temporarily removes drive to protect the amplifier and load from faults.

4.3.4 Transformer Thermal Protection

Details transformer thermal protection that shuts down a channel if the transformer overheats.

4.3.5 Fuses and Circuit Breakers

Explains the role of internal fuses and circuit breakers in protecting power supplies and cooling fans.

4.4 Controls

Details the operation of front panel controls and back panel switches like sensitivity and ground lift.

4.5 Filter Cleaning

Instructions for removing, washing, and reinstalling the dust filter to maintain cooling efficiency.

5 Technical Information

5.1 Overview

Discusses technological advancements, reliability, protection features, and the grounded bridge topology.

5.2 Circuit Theory

Explains the circuit design, including power transformers, low-voltage supply, and basic signal paths.

5.2.1 Stereo Operation

Describes the signal path for stereo operation, including the balanced gain stage and error amp.

5.2.2 Bridge-Mono Operation

Explains how the stereo/mono switch converts the amplifier to bridged-mono operation for higher voltage.

5.2.3 Parallel-Mono Operation

Details parallel-mono operation for increased current, where channel 2 is paralleled with channel 1.

6 Specifications

7 AC Power Draw and Thermal Dissipation

8 Accessories

8.1 Cooling Fan Options

Describes optional replacement fan blades for special cooling requirements, installation by technician.

8.2 Input Connectors

Introduces optional input connector accessories: MT-XLR and MT-BB.

8.2.1 MT-XLR

Accessory panel with two standard 3-pin female XLR inputs for easy connection changes.

8.2.2 MT-BB

Accessory panel providing barrier strip input connectors for applications requiring bare wire.

9 Service

9.1 Worldwide Service

Guides users to contact Crown/Amcron representative or authorized service center for global service.

9.2 North American Service

Details service options in North America: via authorized service center or directly from the factory.

9.2.1 Service at a North American Service Center

Explains the process for obtaining service at a center, including warranty proof and necessary paperwork.

9.2.2 Factory Service

Instructs users to fill out service information form and ship unit to Crown factory for repairs.

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