Crown Micro-Tech MT-600 Service Manual
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Crown Micro-Tech MT-600 Service Manual

Crown micro-tech mt-600: supplementary guide
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Micro-Tech 600 Amplifier Service Manual

POWER AMPLIFIER

SERVICE MANUAL
MICRO-TECH
®
-600
©1995 by CROWN INTERNATIONAL, INC.
Mailing Address:
Shipping Address:
P.O. Box 1000
57620 C.R. 105
Elkhart, IN U.S.A. 46515-1000
Elkhart, IN U.S.A. 46517
Micro-Tech
®
, ODEP
®
and Crown
®
are registered trademarks of Crown International, Inc.
K-SVCMT6
8-95
1

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Summary of Contents for Crown Micro-Tech MT-600

  • Page 1: Power Amplifier

    ©1995 by CROWN INTERNATIONAL, INC. Mailing Address: Shipping Address: P.O. Box 1000 57620 C.R. 105 Elkhart, IN U.S.A. 46515-1000 Elkhart, IN U.S.A. 46517 Micro-Tech ® , ODEP ® and Crown ® are registered trademarks of Crown International, Inc. K-SVCMT6 8-95...
  • Page 2 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. If you need special assistance beyond the scope of this manual, please contact the Crown Technical Support Group.

  • Page 3: Table Of Contents

    Micro-Tech 600 Amplifier Service Manual Table of Contents Introduction ... 4 Scope ... 4 Warranty ... 4 Parts Information ... 5 Specifications ... 6 Voltage Conversion ... 7 Circuit Theory ... 8 Electrical Checkout Procedures ... 13 Parts List (Non-Module) ... 17 Module and Schematic Information ...

  • Page 4: Introduction

    MT-600 amplifier including the Amcron MT-601. The Parts Listings include parts specific for the US version and the European version (MT-600E13). For parts specific only to other versions contact the Crown Technical Support Group for help in finding part numbers.

  • Page 5: Parts Information

    PART NUMBERING SYSTEMS As of the printing of this manual, Crown is using two numbering systems. The elder system always uses eight characters. The first character is a letter. Com- mon letters used are C, D, H, M, P, and Q.

  • Page 6: Specifications

    8 ohm load per channel, both channels driven, the sensitivity switch in the 26dB position, the AC supply is 120VAC at 60Hz. Crown specifications are guaranteed through the warranty period (normally 3 years). Because our testing methods are more strin- gent than our published specifications, every Crown amplifier will exceed its published specifications.

  • Page 7: Voltage Conversion

    The 120 Volt 60 Hz version, sold in the United States, is not voltage selectable. It does not have voltage selection boards. This version is to be used only with 120 Volts and only with 60Hz. All other versions of the Micro Tech 600 use voltage selection boards.

  • Page 8: Circuit Theory

    OVERVIEW It should be noted that over time Crown makes im- provements and changes to their products for various reasons. This manual is up to date as of the time of writing. For additional information regarding these amplifiers, refer to the applicable Technical Notes provided by Crown for this product.
  • Page 9 This negative feedback fixes gain at the offset reference points (and the output of the Error Amp) at a factor of -25.2 with respect to the amplifier output. The Voltage Translators are arranged in a common base configuration for non-inverting voltage gain with equal gain.
  • Page 10 PNP. One difference is that the PNP bias resistor is slightly greater in value so that PNP output devices run closer Figure 2. Crown Patented Grounded Bridge Topology Micro-Tech 600 Amplifier Service Manual Theory to the cutoff level under static (no signal) conditions.
  • Page 11 AB+B in the same manner as the HS. When the amplifier output swings positive, the audio is fed to an op-amp stage where it is inverted. This inverted signal is delivered directly to the bases of the positive (NPN) and negative (PNP) LS predrivers. The negative drive forces the LS PNP devices on (NPN off).
  • Page 12 BALANCED INPUTS Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown) Micro-Tech 600 Amplifier Service Manual Theory +VOLTAGE TRANSLATOR ERROR OUTPUT DEVICE EMULATION PROTECTION -VOLTAGE TRANSLATOR INVERTING BRIDGE BALANCE POSITIVE +LVA HIGH SIDE OUTPUT NPN STAGE HIGH SIDE...

  • Page 13: Electrical Checkout Procedures

    Electrical Checkout Procedures GENERAL INFORMATION The following test procedures are to be used to verify operation of this amplifier. DO NOT connect a load or inject a signal unless directed to do so by the proce- dure. These tests, though meant for verification and alignment of the amplifier, may also be very helpful in troubleshooting.
  • Page 14 4. Increase output level until current limit oc- curs. Current limit should occur at 20 ±2 Amps (20 Vpk). Observe clean (no oscillations) current clipping. TEST 10: SLEW RATE & 10 KHZ SQUARE WAVE Spec: 13 - 15 V/µS. Initial Conditions: Controls per standard.
  • Page 15 Electrical Checkout Procedures TEST 12: OUTPUT POWER Spec at 8 Ohm Stereo: >= 235W at 0.1% THD. Spec at 4 Ohm Stereo: >= 340W at 0.1% THD. Spec at 2 Ohm Stereo: >= 410W at 0.1% THD. International 8 Ohm Stereo: >=220W at 0.1% THD. International 4 Ohm Stereo: >=275W at 0.1% THD.
  • Page 16 Micro-Tech 600 Amplifier Service Manual Electrical Checkout Procedures TEST 18: TURN OFF TRANSIENTS Spec: No dangerous transients. Initial Conditions: Controls per standard. Procedure: From an on condition, turn off the amplifier and monitor the output noise at the time of turn off. Note: Turn off noise may increase significantly if the amplifier is cycled off and on.

  • Page 17: Parts List (Non-Module)

    Fuse Module, Ch 2 (50-60 Hz Units) A10285-23 7 Amp Fuse (100-120V Units) A10285-21 5 Amp Fuse (200-240V Units) A10285-7 .5 Amp Fuse (120V 60Hz Units Only) D 6419A0 Power Transformer (120V 60Hz Units Only) D 7685-7 Power Transformer (50-60Hz Universal Voltage) D 6301A0...
  • Page 18 Front Panel Overlay "ODEP" F10861A5 Old Front Panel Overlay "Supply" To upgrade the old plastic filter assembly to the new metal style, a kit may be ordered using Crown part number M44077-2. This kit includes a new bottom cover. MAIN CHASSIS ASSEMBLY...
  • Page 19 MAIN CHASSIS ASSEMBLY (CONT.) ITEM A10110-70605 Screw, 6-32-.312 Taptite Ph (Covers) A10086-70806 8-32 x .37 Screw A10094-3 #6 Internal Star Washer A10094-6 #8 Internal Star Washer A10094-8 #10 Internal Star Washer, Zinc A10099-7 #10 Nylonb Shoulder Washer A10100-16 7/16OD x .203ID Washer A10102-8 10-32 Hex Nut A10109-10822...

  • Page 20: Module And Schematic Information

    Module and Schematic Information MODULE HISTORY The Micro Tech 600 amplifier was introduced in Janu- ary 1986. Since then there have been several updates and revisions, some of which called for new modules. The following is a list of all modules used up to this date, August 1995.

  • Page 21: Fuse And Display Modules

    Amber #MV5153 A10266-1351 1.3M A10266-4751 4.7M A10266-4751 4.7M A10266-4741 470K A10266-2221 2.2K A10266-1522 1.5K .5W A10266-1001 A10266-1522 1.5K .5W A10266-5111 C 3625-8 2N4125 PNP C 5070-5 TL072CP Op Amp C 4508-5 16 Pin IC Socket D 8030-5 MT Display Bd.

  • Page 22: Q42549-8 Output Module

    Q42549-8 Output Module (P10115-7 board) Parts List CAPACITORS C 3978-1 C 6804-6 C 6804-6 C 3996-3 C 6807-9 C 6806-1 C 6807-9 C 6809-5 C 6810-3 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1...

  • Page 23: Q42647-0 Output Module

    Q42647-0 Output Module (P10137-1 board) Parts List CAPACITORS C 3978-1 C 6804-6 C 6804-6 C 3996-3 C 6807-9 C 6806-1 C 6807-9 C 6809-5 C 6810-3 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1...

  • Page 24: Q42717-1 Output Module

    Q42717-1 Output Module (P10233-8 board) Parts List CAPACITORS C 3978-1 C 3218-2 C 3218-2 C 8534-7 C 6807-9 C 6806-1 C 6807-9 C 6810-3 C 6809-5 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1...

  • Page 25: Q42817-6 Output Module

    Q42871-6 Output Module (P10305-4 board) Parts List CAPACITORS C 8511-5 C 7964-7 C 7964-7 C 8534-7 C 8534-7 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 6806-1 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1...

  • Page 26: Q42968-0 Output Module

    Q42968-0 Output Module (P10341-9 board) Parts List CAPACITORS C 8511-5 C 7964-7 C 7964-7 C 8534-7 C 6807-9 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 6806-1 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1...

  • Page 27: Q43202-3 Output Module

    Q43202-3 Output Module (P10397-1 board) Parts List CAPACITORS C 8511-5 C 7964-7 C 7964-7 C 8534-7 C 8534-7 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 6806-1 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1...

  • Page 28: Q42552A0 Main Module

    Q42552A0 Main Module (D6304A4/D6304B2 board) Parts List CAPACITORS C 4303-1 C 3913-8 C 4303-1 C 6802-0 C100 C200 C 5053-1 C101 C201 C 2821-4 C103 C203 C 6805-3 C104 C204 C 6805-3 C105 C205 C 6950-7 C106 C206 C 6950-7 C108 C208 C 6812-9...
  • Page 29 Q42552A0 Main Module (D6304A4/D6304B2 board) Parts List Cont. R116 R216 A10266-3351 R118 R218 A10266-2711 R119 R219 A10266-3011 R120 R220 A10266-2711 R121 R221 C 5062-2 R122 R222 A10266-2741 R123 R223 A10266-1831 R124 R224 A10266-6821 R125 R225 C 7782-3 R126 R226 C 7782-3 R127 R227 A10266-6821...

  • Page 30: Q42713-0 Main Module

    Q42713-0 Main Module (D 6910-0 board) Parts List CAPACITORS C 4303-1 C 3913-8 C 4303-1 C 6802-0 C 6806-1 C 6806-1 C100 C200 C 5311-3 C101 C201 C 2820-6 C103 C203 C 6805-3 C104 C204 C 6805-3 C105 C205 C 6812-9 C106 C206 C 6812-9...
  • Page 31 Q42713-0 Main Module (D 6910-0 board) Parts List Cont. A10266-3323 R100 R200 C 7409-3 R101 R201 A10265-49911 R102 R202 A10266-1021 R103 R203 A10265-10031 R104 R204 A10266-2721 R105 R205 A10266-2721 R106 R206 A10266-1231 R107 R207 A10266-4731 R108 R208 A10266-1021 R109 R209 A10266-8201 R110 R210...

  • Page 32: Q42776-7 Main Module

    Q42776-7 Main Module (D 7251-8 board) Parts List CAPACITORS C 3913-8 C 3913-8 C 6802-0 C 6806-1 C 6806-1 C 6094-9 C 6806-1 C100 C200 C 5311-3 C101 C201 C 2820-6 C103 C203 C 6805-3 C104 C204 C 6804-6 C105 C205 C 6812-9 C106...
  • Page 33 Q42776-7 Main Module (D 7251-1 board) Parts List Cont. Q116 Q216 C 3786-8 Q117 Q217 D 2961-7 Q118 Q218 D 2961-7 Q119 Q219 C 3625-8 Q120 Q220 C 3625-8 Q121 Q221 C 7458-0 Q122 Q222 C 7458-0 RESISTORS A10265-53621 A10266-2402 A10266-2402 A10265-46421 A10266-3321...
  • Page 34 Q42776-7 Main Module (D 7251-1 board) Parts List Cont. INTEGRATED CIRCUITS C 5095-2 C 5096-0 U100 U200 C 6911-9 U103 U203 C 6910-1 U104 U204 C 6900-2 CONNECTORS C 7593-4 C 4508-5 C 7527-2 C 7592-6 C 7526-4 J100 J200 C 6777-4 J500 J800...

  • Page 35: Q42983-9 Main Module

    Q42983-9 Main Module (D7911-7 board) Parts List CAPACITORS C 4303-1 C 3913-8 C 6802-0 C 6806-1 C 6806-1 C 6804-6 C100 C200 C 5311-3 C101 C201 C 2821-4 C103 C203 C 6805-3 C104 C204 C 6805-3 C105 C205 C 6812-9 C106 C206 C 6812-9...
  • Page 36 Q42983-9 Main Module (D7911-7 board) Parts List Cont. Q117 Q217 D 2961-7 Q118 Q218 D 2961-7 Q119 Q219 C 3625-8 Q120 Q220 C 3625-8 Q121 Q221 C 7458-0 Q122 Q222 C 7458-0 Q123 Q223 C 7458-0 Q124 Q224 C 3625-8 RESISTORS A10265-53621 A10266-2402...
  • Page 37 Q42983-9 Main Module (D7911-7 board) Parts List Cont. R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294 A10266-1041 R195 R295 A10266-3021 R196 R296 A10266-4721 R197 R297 A10266-1031 R198 R298 A10266-4721 R199 R299...

  • Page 38: Q43038-1 Main Module

    Q43038-1 Main Module (D7993-5 board) Parts List CAPACITORS C 4303-1 1000µF C 3913-8 470µF C 6802-0 .47µF C 6806-1 .01µF C 6806-1 .01µF C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 2821-4 10pF C103 C203 C 6805-3 .022µF C104 C204...
  • Page 39 Q43038-1 Main Module (D7993-5 board) Parts List Cont. Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 RESISTOR NETWORKS N101 N201 D 7946-3 Resistor Network N102 N202 D 6082-8 Resistor Network RESISTORS A10265-53621 53.6K 1% C 7340-0...
  • Page 40 Q43038-1 Main Module (D7993-5 board) Parts List Cont. R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294 A10266-1041 100K R195 R295 A10266-3021 R196 R296 A10266-4721 4.7K R197 R297 A10266-1031 R198 R298 A10266-4721...

  • Page 41: Q43033-2 Main Module

    Q43033-2 Main Module (D7993-5 board) Parts List CAPACITORS C 4303-1 1000µF C 3913-8 470µF C 6802-0 .47µF C 6806-1 .01µF C 6806-1 .01µF C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 9464-6 10pF C103 C203 C 6805-3 .022µF C104 C204...
  • Page 42 Q43033-2 Main Module (D7993-5 board) Parts List Cont. Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 RESISTOR NETWORKS N101 N201 D 7946-3 Resistor Network N102 N202 D 6082-8 Resistor Network RESISTORS A10265-53621 53.6K 1% C 7340-0...
  • Page 43 Q43033-2 Main Module (D7993-5 board) Parts List Cont. R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294 A10266-1041 100K R195 R295 A10266-3021 R196 R296 A10266-4721 4.7K R197 R297 A10266-1031 R198 R298 A10266-4721...

This manual is also suitable for:

Micro-tech-600

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