Crown 2400 Service Manual
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Crown 2400 Service Manual

Crown power amplifier micro-tech 2400 service manual
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Micro-Tech 2400 Amplifier Service Manual

POWER AMPLIFIER

SERVICE MANUAL
MICRO-TECH
®
-2400
©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-SVCMT24
7-95
1

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  • Page 1: Power Amplifier

    Micro-Tech 2400 Amplifier Service Manual POWER AMPLIFIER SERVICE MANUAL MICRO-TECH ® -2400 ©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 ®...
  • Page 2 PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DISCONNECT POWER CORD BEFORE REMOVING REAR INPUT MODULE TO ACCESS GAIN SWITCH. Micro-Tech 2400 Amplifier Service Manual Phone: (800) 342-6939/(219) 294-8200 FAX: (219) 294-8301 ÉLECTRIQUE N’ENLEVEZ PAS LES COUVERTURES. UTILES À L’INTÉRIEUR.

  • Page 3: Table Of Contents

    Micro-Tech 2400 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) ... 16 Module Information ...

  • Page 4: Introduction

    Note that Crown does not sell blank (unpopulated) circuit boards. Micro-Tech 2400 Amplifier Service Manual Introduction Each of the compact audio power amplifiers are designed for professional or commercial use. Provid-...

  • Page 5: Parts Information

    Elkhart, Indiana USA, only. Estab- lished accounts with Crown will receive shipment freight prepaid and will be billed. All others will receive Micro-Tech 2400 Amplifier Service Manual Parts Information shipment on a C.O.D. or pre-payment (check or credit card) basis.

  • Page 6: Specifications

    Slew Rate: >13V per microsecond. (Slew rates are limited to useful levels for ultrasonic/RF protection.) Damping Factor: >1000 from 10 Hz to 400 Hz. DC Offset: <10 millivolts. Micro-Tech 2400 Amplifier Service Manual Specifications Input Impedance: Nominally 20K ohms balanced; 10K ohms unbalanced.

  • Page 7: Voltage Conversion

    This version is to be used only with 120 Volts and only with 60Hz. All other versions of the Micro Tech 2400 use a volt- age selection board. The following chart indicates different configurations of jumpers for different volt- ages.

  • Page 8: Front End Operation

    (enable), and an ODEP indicator for each channel which shows the reserve energy status. In general, the Micro-Tech 2400 Amplifier Service Manual Theory packaging of this model is designed for maximum watt/price/weight/size value with user friendly fea- tures.

  • Page 9: Voltage Amplification

    Audio Inputs Figure 1. Typical Amplifier Front End and Voltage Amplification Stages. Micro-Tech 2400 Amplifier Service Manual Theory The ODEP transistors steal drive as dictated by the ODEP circuitry (discussed later). The control/protec- tion transistors act as switches to totally shunt audio to ground during the turn-on delay, or during a DC/LF or Fault protective action.
  • Page 10 PNP bias resistor is slightly greater in value so that PNP output devices run closer Figure 2. Crown Patented Grounded Bridge Topology Micro-Tech 2400 Amplifier Service Manual Theory to the cutoff level under static (no signal) conditions.
  • Page 11 (which does occur in conventional designs). Micro-Tech 2400 Amplifier Service Manual Theory Low side bias is established by a diode string which also shunts built up charges on the output devices.
  • Page 12 BALANCED INPUTS Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown) Micro-Tech 2400 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: General Information

    2 minutes of turn on from ambient (cold) conditions. If possible measure heatsink temperature, if not mea- sure ambient room temperature. Use this information when referencing the following chart. Micro-Tech 2400 Amplifier Service Manual °F °C 18.9 20.0 21.1...
  • Page 14 (no oscillations) current clipping. .047 uF 1K Ohm Figure 4. Differentiator Circuit Micro-Tech 2400 Amplifier Service Manual TEST 10: SLEW RATE & 10 KHZ SQUARE WAVE Spec: 17 - 25 V/µS. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 10 kHz square wave to obtain 64 volts peak-to-peak at each output.

  • Page 15: Post Testing

    2 Hz 6VAC sine wave into each channel and verify that each channel cycles into mute. Micro-Tech 2400 Amplifier Service Manual TEST 16: SIGNAL TO NOISE RATIO Spec: 100 dB below rated 8 ohm power 20 Hz to 20 kHz.

  • Page 16: Power Supply

    OUTPUT ASSEMBLY (ONE PER CHANNEL) ITEM C 8187-4 NPN Output Device C 8188-2 PNP Output Device C 8573-5 PNP Driver Transistor, TO-3P (2SA1186) C 8574-3 NPN Driver Transistor, TO-3P (2SC2837) Micro-Tech 2400 Amplifier Service Manual Parts List (Non-Module) QTY (PER CHANNEL)

  • Page 17: Back Panel Assembly

    A10101-5 Washer, Nylon (Grille) A10173-1 Clip, Grille Filter D 6944-9 Air Filter D 8052J8 End Cap F12435J7 Grille D 8635-1 MT-2400 Front Panel Overlay Micro-Tech 2400 Amplifier Service Manual Parts List (Non-Module) QTY(PER CHANNEL) Request in Inches Request in Inches...

  • Page 18: Main Chassis Assembly

    16.5" 16 Pin Ribbon Cable C 7351-7 10-12 Ga Splice Connector C 9491-9 Screw, 6-32 x .312 Pan Head D 7784-8 Label, Sensitivity Switch D 8251-7 Label, F1 Fuse Replacement D 8069-4 Insulator, Fuse Board Micro-Tech 2400 Amplifier Service Manual Parts List (Non-Module)

  • Page 19: Main Modules

    Micro-Tech 2400 Amplifier Service Manual Module Information MODULE HISTORY The Micro Tech 2400 amplifier was introduced in January of 1995. 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, July 1995.

  • Page 20: M46330-3 Fuse Module

    2.2K R513 R613 A10266-1522 1.5K .5W R514 R614 A10266-1001 10 Ohm R615 A10266-1522 1.5K .5W R702 A10266-5111 510 Ohm R707 A10266-5111 510 Ohm INTEGRATED CIRCUITS U502 C 5070-5 TL072CP BOARD D 8030-5 MT Display Board Micro-Tech 2400 Amplifier Service Manual...

  • Page 21: Q43354-2 Output Module

    Q43354-2 Output Module Parts List (P10429-2 Board) Q43354-2 Output Module for MT-2400. For Schematic See J0658-5 CAPACITORS C 8511-5 .047µF C 8426-6 .1µF C 8426-6 .1µF C 6806-1 .01µF C 6806-1 .01µF C 6806-1 .01µF C 6807-9 .001µF C 6810-3...

  • Page 22: Q43328-6 Main Module

    Q43328-6 Main Module Parts List (D8679-9 Board) Q43328-6 MT-2400 ORIGINAL MAIN MODULE Use Schematic J 0658-5 CAPACITORS C 3913-8 C 3913-8 C 6802-0 C 6806-1 C 6806-1 C 8897-8 C 5362-6 C100 C200 C 5311-3 C101 C201 C 9464-6 C102...
  • Page 23 C 3625-8 RESISTORS A10265-53621 C 7340-0 C 7340-0 A10265-46421 OPEN A10266-4331 A10265-75021 OPEN A10265-75021 A10266-4331 R100 R200 C 7409-3 Micro-Tech 2400 Amplifier Service Manual R101 R201 R102 R202 Res. Net. R103 R203 Res. Net. R104 R204 R105 R205 R106 R206...

  • Page 24: Test Points

    R915 R1015 A10266-2201 R916 R1016 A10266-2201 R917 R1017 A10266-10021 R918 R1018 A10266-10021 R919 R1019 A10266-10021 R920 R1020 A10266-10021 Micro-Tech 2400 Amplifier Service Manual JUMPER R921 R1021 R922 R1022 1.3K R923 R1023 1.3K R924 R1024 1.3K R925 R1025 11.3K R926 R1026...
  • Page 25 Q43328-6 Main Module Parts List Cont. (D8679-9 Board) J500 J800 D 8681-5 J600 J700 D 8680-7 HW5-8 C 8812-7 Z1-Z5 OPEN Micro-Tech 2400 Amplifier Service Manual 10 In. RBN 6 In. RBN 5.5" Cbl Tie...

  • Page 26: Q43399-7 Main Module

    C147 C247 C 6806-1 C148 C248 C 6810-3 C149 C249 C 6808-7 C150 C250 C 6806-1 C151 C251 C 6806-1 Micro-Tech 2400 Amplifier Service Manual C152 C252 C153 C253 C154 C254 C155 C255 C156 C256 470µF C158 C258 470µF C159 C259 .47µF...
  • Page 27 Q238 C 3810-6 Q139 Q239 C 3578-9 RESISTORS A10265-53621 C 7340-0 C 7340-0 A10265-46421 OPEN A10266-4331 A10265-75021 OPEN OPEN Micro-Tech 2400 Amplifier Service Manual Res. Net. Res. Net. R100 R200 R101 R201 R102 R202 2N3859A R103 R203 MPSA93 R104 R204...
  • Page 28 A10265-10031 R301 R401 A10265-10031 R911 R1011 A10266-1521 R912 R1012 A10266-4711 R913 R1013 A10266-1041 R914 R1014 A10266-5141 Micro-Tech 2400 Amplifier Service Manual 100 .5W FP R915 R1015 2.7K R916 R1016 R917 R1017 11.5K 1% R918 R1018 JUMPER R919 R1019 R920 R1020 1.3K...
  • Page 29 J500 J800 D 8681-5 J600 J700 D 8680-7 HW5-8 C 8812-7 Z1-Z5 OPEN Micro-Tech 2400 Amplifier Service Manual 14 Pin Heatsinks Nyl. Spacer 5 Pin HDR 16 Pin 3 Pin HDR Ph. Jack Ph Jk CVR 10 In. RBN 6 In. RBN...

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