Macro-Tech®
SERVICE MANUAL
Models:
MA-2402
Some models may be exported under the name Amcron
®
©2000 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A.
Telephone: 219-294-8000. Trademark Notice: PIP
, Grounded Bridge
and SmartAmp
are
trademarks and Amcron
®
, Crown
®
, Macro-Tech
®
, IOC
®
, ODEP
®
, and IQ System
®
are registered
trademarks of Crown International, Inc. Other trademarks are the property of their respective
owners.
130445-1
02-00
Rev. A

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   Summary of Contents for Crown Macro-Tech MA-2402

  • Page 1: Power Amplifier

    Macro-Tech® POWER AMPLIFIER SERVICE MANUAL Models: MA-2402 Some models may be exported under the name Amcron ® ©2000 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. Trademark Notice: PIP ™ , Grounded Bridge ™ and SmartAmp ™...

  • Page 2

    130445-1 Rev. A MA-2402 Service Manual The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or maintenance.

  • Page 3: Revision History

    130445-1 Rev. A MA-2402 Service Manual Revision History Comments Revision Number Date 02-2000 Initial Printing Rev. A ©2000 Crown International, Inc.

  • Page 4

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank ©2000 Crown International, Inc.

  • Page 5: Table Of Contents

    130445-1 Rev. A MA-2402 Service Manual Table of Contents 1 Introduction ................1-1 1.1 Introduction ................1-1 1.2 The MA “02” Series Amplifiers ........... 1-1 1.3 Scope ..................1-1 1.4 Warranty ..................1-1 2 Specifications ................. 2-1 3 Voltage Conversion ..............3-1 4 Circuit Theory ................

  • Page 6: Table Of Contents

    130445-1 Rev. A MA-2402 Service Manual Table of Contents 5.3.15 Intermodulation Distortion (IMD) ........5-4 5.3.16 Displays ................5-4 5.3.17 Post Testing ..............5-4 6 Parts ..................6-1 6.1 General Information ..............6-1 6.2 Ordering and Receiving Parts ..........6-1 6.2.1 Terms ..................

  • Page 7: Introduction, The Ma "02" Series Amplifiers, Scope, Warranty

    130445-1 Rev. A MA-2402 Service Manual ture balanced inputs with bridged and parallel mono- 1 Introduction phonic capability. Specific features vary depending on model. 1.1 Introduction 1.3 Scope This manual contains complete service information This Service Manual in intended to apply to all ver- on the Crown ®...

  • Page 8

    130445-1 Rev. A MA-2402 Service Manual Figure 1.1 MA-2402 Front and Rear Views 1-2 Introduction ©2000 Crown International, Inc.

  • Page 9: Specifications

    130445-1 Rev. A MA-2402 Service Manual Slew Rate: (Slew rates are limited to useful levels for ultrasonic/RF protection). Greater than 13 volts per microsecond. 2 Specifications Controls Enable: A front-panel push button used to turn the amplifier on and off. Level: A front-panel 31-detent rotary control for each channel used 6 Specifications to control the output level.

  • Page 10: Specifications

    130445-1 Rev. A MA-2402 Service Manual transistor stages, particularly in the case of elevated temperature. Cooling: Internal heat sinks with forced-air cooling for rapid, Transformer overheating will result in a temporary shutdown of the uniform heat dissipation. affected channel; when it has cooled to a safe temperature, the Dimensions: EIA Standard 19-inch (48.3-cm) rack mount width transformer will automatically reset itself.

  • Page 11

    130445-1 Rev. A MA-2402 Service Manual –1 8 ohm 1 watt 4 ohm –2 2 ohm –3 –4 –5 –6 –7 10 K 100 K FREQUENCY (Hz) Figure 2.5 Typical Frequency Response 1400 1200 1000 8 ohm 10 K 20 K FREQUENCY (Hz) Figure 2.6 Typical Damping Factor 504.0...

  • Page 12

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 2-4 Specifications ©2000 Crown International, Inc.

  • Page 13: Voltage Conversion

    130445-1 Rev. A MA-2402 Service Manual 100 – 240 VAC, 50/60 Hz Units These units have mult-tap transformers that accept 100, 3 Voltage Conversion 120, 220/230, or 240 VAC, and 50 or 60 Hz power mains. Jumpers are used to configure the power supplies for different voltages.

  • Page 14

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 3-2 Voltage Conversion ©2000 Crown International, Inc.

  • Page 15: Circuit Theory, Overview, Features, Front End Operation, Balanced Gain Stage (bgs), Variable Gain Stage (vgs)

    130445-1 Rev. A MA-2402 Service Manual ergy status, and a SPI/IOC indicator for each channel 4 Circuit Theory which indicates signal output and distortion. In general, the packaging of this model is designed for maximum watt/price/weight/size value with user friendly features. 4.1 Overview For additional details refer to the specification section, or to the applicable Reference Manual.

  • Page 16: Voltage Amplification, Voltage Translators, Last Voltage Amplifiers (lvas), Grounded Bridge Topology, High Side (hs)

    130445-1 Rev. A MA-2402 Service Manual 4.4.2 Last Voltage Amplifiers (LVAs) dition which in turn results in high peak output voltage. The output of the Error Amp, called the Error Signal (ES) The Voltage Translator stage channels the signal to the drives the Voltage Translators.

  • Page 17: Low Side (ls)

    130445-1 Rev. A MA-2402 Service Manual The output of the +LVA drives the base of predriver the power supply to protect output devices from dan- device. Together, the predriver and driver form the first gerous reverse voltage levels. An output terminating two parts of the three-deep Darlington and are biased circuit blocks RF on output lines from entering the am- class AB.

  • Page 18: Output Device Emulation Protection (odep)

    130445-1 Rev. A MA-2402 Service Manual 4.6 Output Device Emulation Protection for example, the power supply produced a total of 70V from rail to rail (±35VDC measured from ground with no (ODEP) signal), the amplifier output would reach a positive peak To further protect the output stages, a specially devel- of +70V.

  • Page 19

    130445-1 Rev. A MA-2402 Service Manual POSITIVE +LVA +VOLTAGE HIGH SIDE TRANSLATOR OUTPUT NPN STAGE ERROR OUTPUT HIGH SIDE DEVICE BALANCED BIAS EMULATION INPUTS SERVO PROTECTION NEGATIVE -VOLTAGE -LVA HIGH SIDE TRANSLATOR OUTPUT PNP STAGE MAIN NEGATIVE FEEDBACK (NFb) LOOP POSITIVE LOW SIDE OUTPUT...

  • Page 20

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 4-6 Circuit Theory ©2000 Crown International, Inc.

  • Page 21: Maintenance, Cautions And Warnings, General Information, Test Procedures, Output Bias Adjustment, Odep Voltage Adjustment

    130445-1 Rev. A MA-2402 Service Manual alignment of the amplifier, may also be very helpful in troubleshooting. For best results, tests should be per- 5 Maintenance formed in order. All tests assume that AC power is from a regulated AC source appropriate for the unit under test..

  • Page 22: Dc Offset, Quiescent Power Draw, Voltage Gain, Current Limit

    130445-1 Rev. A MA-2402 Service Manual 5.3.5 Quiescent Power Draw ODEP Voltage Chart Tolerance ±0.1V Spec: 100 watts maximum °C °F Voltage Procedure: With no input signal the amplifier should draw 95.0 10.73 no more than 100 watts from the power source. Slightly 93.2 10.66 high readings may be due to out of tolerance Output...

  • Page 23: Khz Square Wave Response, Crosstalk, Output Power, Odep Limiting

    130445-1 Rev. A MA-2402 Service Manual 5.3.8 10 kHz Square Wave Response International: Spec at 8 Ohm Stereo: >= 512W at 0.1% THD. Spec: No overshoot, ringing, or oscillations. Slew rate Spec at 4 Ohm Stereo: >= 742W at 0.1% THD. 17 - 25 V/µS into 8 ohm load.

  • Page 24: Fan Operation, Lf Protection, Signal To Noise, Intermodulation Distortion (imd), Displays, Post Testing

    130445-1 Rev. A MA-2402 Service Manual 5.3.12 Fan Operation Procedure: Load each channel to 8 ohms. Inject a SMPTE standard IM signal (60 Hz and 7 kHz sine wave Spec:Continuous full speed. mixed at 4:1 ratio). Set the 60 Hz portion of the signal for 50.8 Vrms output.

  • Page 25: Part, General Information, Ordering And Receiving Parts, Terms, Shipment

    130445-1 Rev. A MA-2402 Service Manual 6.2.1 Terms 6 Parts Normal terms are prepaid. Net-30 Days applies to only those having pre-established accounts with Crown. The Crown Parts Department does accept Visa or Master Card. If prepaying, the order must be packed and 6.1 General Information weighed before a total bill can be established, after which an amount due will be issued and shipment made...

  • Page 26

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 6-2 Parts ©2000 Crown International, Inc.

  • Page 27: Exploded View Parts

    130445-1 Rev. A MA-2402 Service Manual 7 Exploded View Parts 7.1 General Information This chapter includes a mechanical part list for this product. All serviceable parts and assemblies will have a Crown Part Number (CPN) listed in this chapter. The parts listed are current as of the date printed.

  • Page 28

    MA-2402 Service Manual 130445-1 Rev. A Item Quantity Description Part # (CPN) This page intentionally left blank 7-2 Exploded View Parts ©2000 Crown International, Inc.

  • Page 29

    130445-1 Rev. A MA-2402 Service Manual Figure 7.1 MA-2402 Chassis Assembly (Top) Exploded View Parts 7-3 ©2000 Crown International, Inc.

  • Page 30

    MA-2402 Service Manual 130445-1 Rev. A 7.2 Chassis Assembly (Top) 7.2 Chassis Assembly (Top) Continued Refer to figure 7.1 for Location of Major Parts Refer to figure 7.1 for Location of Major Parts Item Quantity Description Part # (CPN) Item Quantity Description Part # (CPN)

  • Page 31

    130445-1 Rev. A MA-2402 Service Manual Figure 7.2 MA-2402 Chassis Assembly (Bottom) Exploded View Parts 7-5 ©2000 Crown International, Inc.

  • Page 32

    MA-2402 Service Manual 130445-1 Rev. A 7.3 Chassis Assembly (Bottom) Refer to figure 7.2 for Location of Major Parts Item Quantity Description Part # (CPN) CVR, MA2400/3600 BTM PC F12609-8 SEMS, 6-32 X .31 TORX PNHD STAR 103433-70605 8-18 X 1.375 PH PNHD ST SCR Z A10109-10822 NYL THUMBSCREW WASHER D4137-2...

  • Page 33

    130445-1 Rev. A MA-2402 Service Manual 7.4 Heat Sink Assembly (Channel 1 and 2 are Identical) Refer to figure 7.3 for Exploded View Item Quantity Description Part # (CPN) Item Quantity Description Part # (CPN) INS, 1.38 X 13.56 PAPER D8867-0 6-32 X .312 PAN HD T15 TT TYPE W C9491-9...

  • Page 34

    MA-2402 Service Manual 130445-1 Rev. A 7.5 Cap Shelf Assembly (Channel 1 and 2 are Identical) Refer to figure 7.4 for Exploded View Item Item Quantity Quantity Description Description Part # (CPN) Part # (CPN) 6-32X.312 PAN HD T15 TT TYPE W C9491-9 CLIP, MA2402 RECTIFIER SPRING 127467-1...

  • Page 35

    130445-1 Rev. A MA-2402 Service Manual 7.6 Fan Assembly Refer to figure 7.5 for Exploded View Item Quantity Description Part # (CPN) Item Quantity Description Part # (CPN) 6-32 X 5/16 UNDERCUT FLTHD MSCR C7062-0 BRACKET, FAN D8439-8 6-32 X .312 PAN HD T15 TT TYPE W C9491-9 XMOTOR SEE SECTION 3...

  • Page 36

    MA-2402 Service Manual 130445-1 Rev. A 7.7 Standard PIP Assembly Refer to figure 7.6 for Exploded View Item Quantity Description Part # (CPN) Item Quantity Description Part # (CPN) #8 X 1/4 #6 PNHD PH BZ C 7161-0 PWA, PIP2FXQ 127210-1 PANEL, PIP2FXQ 127234-1...

  • Page 37: Schematics, Module And Schematic Information

    130445-1 Rev. A MA-2402 Service Manual 8.2.5 Relay PWA: 8 Module and Schematic Ch 1 Information 127476-1 Domestic Relay PWA on 127199-1 PWB. 127259-1 8.1 General Information Export Relay PWA on 127199-1 PWB. The schematics referenced and provided are repre- Ch 2 sentative only.

  • Page 38

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 8-2 Module and Schematic Information ©2000 Crown International, Inc.

  • Page 39: Module Parts

    130445-1 Rev. A MA-2402 Service Manual 9 Module Parts 9.1 General Information This chapter includes electrical parts lists for this prod- uct. All serviceable parts and assemblies will have a Crown Part Number (CPN) listed in this chapter. The parts listed are current as of the date printed. Crown reserves the right to modify and improve its products for the benefit of its customers.

  • Page 40

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 9-2 Module Parts ©2000 Crown International, Inc.

  • Page 41

    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-3 ©2000 Crown International, Inc...

  • Page 42

    130445-1 Rev. A MA-2402 Service Manual 9-4 Module Parts ©2000 Crown International, Inc.

  • Page 43

    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-5 ©2000 Crown International, Inc...

  • Page 44

    130445-1 Rev. A MA-2402 Service Manual 9-6 Module Parts ©2000 Crown International, Inc.

  • Page 45

    130445-1 Rev. A MA–2402 Service Manual 102774-2 PWA Component Map (Component Side) Module Parts 9-7 ©2000 Crown International, Inc.

  • Page 46

    MA– 2402 Service Manual 130445-1 Rev. A This Page Intentionally Left Blank 9-8 Module Parts ©2000 Crown International, Inc.

  • Page 47

    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-9 ©2000 Crown International, Inc...

  • Page 48

    130445-1 Rev. A MA-2402 Service Manual 9-10 Module Parts ©2000 Crown International, Inc.

  • Page 49

    130445-1 Rev. A MA-2402 Service Manual 127100-2 PWA Component Map (Component Side) Module Parts 9-11 ©2000 Crown International, Inc...

  • Page 50

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 9-12 Module Parts ©2000 Crown International, Inc.

  • Page 51

    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-13 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-14 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-15 ©2000 Crown International, Inc...

  • Page 54

    130445-1 Rev. A MA-2402 Service Manual 127177-2 PWA Component Map (Component Side) 9-16 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-17 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-18 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-19 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 9-20 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-21 ©2000 Crown International, Inc...

  • Page 60

    130445-1 Rev. A MA-2402 Service Manual 9-22 Module Parts ©2000 Crown International, Inc.

  • Page 61

    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-23 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-24 Module Parts ©2000 Crown International, Inc.

  • Page 63

    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-25 ©2000 Crown International, Inc...

  • Page 64

    130445-1 Rev. A MA-2402 Service Manual 9-26 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-27 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-28 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-29 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-30 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-31 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-32 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-33 ©2000 Crown International, Inc...

  • Page 72

    130445-1 Rev. A MA-2402 Service Manual 9-34 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-35 ©2000 Crown International, Inc...

  • Page 74

    130445-1 Rev. A MA-2402 Service Manual 9-36 Module Parts ©2000 Crown International, Inc.

  • Page 75

    130445-1 Rev. A MA– 2402 Service Manual 127245-3 PWA Component Map (Component Side) Module Parts 9-37 ©2000 Crown International, Inc.

  • Page 76

    MA– 2402 Service Manual 130445-1 Rev. A This Page Intentionally Left Blank 9-38 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-39 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-40 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-41 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 9-42 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-43 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-44 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-45 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 9-46 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-47 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual 9-48 Module Parts ©2000 Crown International, Inc.

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    130445-1 Rev. A MA-2402 Service Manual Module Parts 9-49 ©2000 Crown International, Inc...

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    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 9-50 Module Parts ©2000 Crown International, Inc.

  • Page 89

    130445-1 Rev. A MA-2402 Service Manual 10 Schematics The schematics referenced and provided are repre- sentative only. There may be slight variations between amplifier to amplifier. These schematics are intended to be used for troubleshooting purposes only. 102773 127108 127175 127198 127252 127494...

  • Page 90

    130445-1 Rev. A MA-2402 Service Manual This page intentionally left blank 10-2 Schematics ©2000 Crown International, Inc.

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Macro-tech 2402

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