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Crown 1200 Service Manual

Crown micro-tech -1200 power amplifier service manual
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Micro-Tech 1200 Amplifier Service Manual

POWER AMPLIFIER

SERVICE MANUAL
MICRO-TECH
®
-1200
©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-SVCMT12
8-95
1

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  • Page 1: Power Amplifier

    Micro-Tech 1200 Amplifier Service Manual POWER AMPLIFIER SERVICE MANUAL MICRO-TECH ® -1200 ©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 1200 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 1200 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

    FOR USE BY AN EXPERIENCED TECHNICIAN ONLY! SCOPE This Service Manual in intended to apply to all versions of the MT-1200 amplifier including the Amcron MT- 1201. The Parts Listings include parts specific for the US version and the European version (MT-1200E13).

  • 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 1200 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 1200 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 1200 use voltage selection boards. The following chart indicates which jumpers are used for different voltages. Note that the fuses and transmotor may need to be changed to accommodate different voltages.

  • Page 8: Circuit Theory

    (enable), and an ODEP indicator for each channel which shows the reserve energy status. In general, the Micro-Tech 1200 Amplifier Service Manual Theory packaging of this model is designed for maximum watt/price/weight/size value with user friendly fea- tures.
  • Page 9 Audio Inputs Figure 1. Typical Amplifier Front End and Voltage Amplification Stages. Micro-Tech 1200 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 1200 Amplifier Service Manual Theory to the cutoff level under static (no signal) conditions.
  • Page 11 (which does occur in conventional designs). Micro-Tech 1200 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 1200 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

    R02, adjust R26 if necessary. Measure DC voltages on the output module across R21, adjust R23 if necessary. Repeat for second channel. Micro-Tech 1200 Amplifier Service Manual TEST 3: ODEP VOLTAGE ADJUSTMENT Spec: Bias Per Chart, ±0.1V DC. Initial Conditions: Controls per standard, heatsink at room temperature 20 to 30°C (68 to 86°F).
  • Page 14 10° of each other. TEST 8: LEVEL CONTROLS Micro-Tech 1200 Amplifier Service Manual Spec: Level controlled by level controls. Initial Conditions: Controls per standard. Procedure: No Load. Inject a 1 kHz sine wave. With level controls fully clockwise you should see full gain.
  • Page 15 2, and install the load on Channel 1. Again, observe that both channels limit. Return all amplifier controls to standard initial conditions. Remove the fan obstruction. Micro-Tech 1200 Amplifier Service Manual Figure 5. ODEP Limiting Wave Form TEST 15: LF PROTECTION Spec: Amplifier mutes for low frequency.
  • Page 16 Micro-Tech 1200 Amplifier Service Manual Electrical Checkout Procedures 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)

    -For units with output board P10305-4 use Output Pad C 7597-4. -For units with ouput boards earlier than P10305-4 use Output Pad D 7026-4. D 8197-2 Paper Shroud C 9387-9 Plasti-Rivit Micro-Tech 1200 Amplifier Service Manual Parts List (Non-Module) QTY (PER CHANNEL)
  • Page 18 -Note: The old Style bottom cover used with the plastic grill is no longer available. You may upgrade to the new style by ordering the kit M44077-2. Micro-Tech 1200 Amplifier Service Manual Parts List (Non-Module) QTY (ONE PER CHANNEL) Order in inches...
  • Page 19 6-32 x .312 Pan Head Screw C 9953-8 2-20 x .312 Pan Head Screw C10111-0 Button, Mtg D 7622-0 16.5" 28AWG Ribbon Cable, 16 Pin H43424-3 Tube, .75 x 3.5 Slit H43451-6 Tube, .375 x 3.5 Micro-Tech 1200 Amplifier Service Manual Parts List (Non-Module) QTY.

  • Page 20: Module And Schematic Information

    Module and Schematic Information MODULE HISTORY The Micro Tech 1200 amplifier was introduced in January 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

    A10266-6224 6.2K Ohm 2W C 4342-9 Amber LED C 5868-2 0 Ohm Jumper S 5846-1 Double Side Foam Tape P10105-8 MT LED Board Micro-Tech 1200 Amplifier Service Manual Q43061-3 ODEP DISPLAY MODULE CAPACITORS C503 C603 C507 C607 C701 C702 DIODES...

  • Page 22: Q42549-8 Output Module

    C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 4479-9 A10266-4711 A10266-2R73 A10266-2R73 A10266-7501 A10266-2R73 C 6486-2 C 6486-2 C 6486-2 C 6486-2 Micro-Tech 1200 Amplifier Service Manual .047µF .1µF .1µF .0047µF .001µF .01µF .001µF R30* 220pF 180pF MISC Board Jumpers...

  • Page 23: Q42647-0 Output Module

    C 7778-1 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7779-9 A10266-4711 A10266-2R73 A10266-2R73 A10266-7501 A10266-2R73 C 6486-2 C 6486-2 C 6486-2 Micro-Tech 1200 Amplifier Service Manual .047µF .1µF .1µF .0047µF .001µF .01µF .001µF 220pF R30* 180pF MISC Board 1N4004...

  • Page 24: Q42717-1 Output Module

    C 7778-1 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7779-9 A10266-4711 A10266-2R73 A10266-1204 A10266-7501 A10266-1204 C 6486-2 Micro-Tech 1200 Amplifier Service Manual .047µF .22µF .22µF .0047µF .001µF .01µF .001µF 180pF 220pF 1N4004 R30* 1N4004 1N4004...

  • Page 25: Q42871-6 Output Module

    A10266-4711 C 7778-1 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7779-9 A10266-4711 A10266-2R73 A10266-1204 A10266-7501 A10266-1204 Micro-Tech 1200 Amplifier Service Manual .047µF .22µF .22µF .0047µF .0047µF .01µF .001µF 180pF 220pF .01µF 1N4004 1N4004 R30*...

  • Page 26: Q42968-0 Output Module

    A10266-4711 C 7778-1 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7779-9 A10266-4711 A10266-2R73 A10266-1204 A10266-7501 A10266-1204 Micro-Tech 1200 Amplifier Service Manual .047µF .22µF .22µF .0047µF .001µF .01µF .001µF 180pF 220pF .01µF 1N4004 1N4004 R30*...

  • Page 27: Q43202-3 Output Module

    A10266-4711 C 7778-1 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7779-9 A10266-4711 A10266-2R74 A10266-1204 A10266-7501 A10266-1204 Micro-Tech 1200 Amplifier Service Manual .047µF .22µF .22µF .0047µF .0047µF .01µF .001µF 180pF 220pF .01µF 1N4004 1N4004 R30*...

  • Page 28: Q42552A0 Main Module

    D109 D209 C 3181-2 D110 D210 C 3181-2 D111 D211 C 3181-2 D112 D212 C 3181-2 D113 D213 C 3181-2 Micro-Tech 1200 Amplifier Service Manual D114 D214 D115 D215 1000uF D120 D220 470uF D121 D221 1000uF D122 D222 .47uF D123...
  • Page 29 A10266-1021 R168 R268 A10265-95301 R170 R270 A10266-1021 R171 R271 A10265-95301 SWITCHES C 6841-8 S100 C 6781-6 Micro-Tech 1200 Amplifier Service Manual INTEGRATED CIRCUITS 3.3M 270 OHM 300 OHM 270 OHM U100 U200 100K TRIM U103 U203 270K U104 U204 6.8K...

  • Page 30: Q42714-8 Main Module

    C249 C 6808-7 C152 C252 C 6809-5 C153 C253 C 5362-6 DIODES C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2851-1 Micro-Tech 1200 Amplifier Service Manual 1000µF D104 D204 470µF D105 D205 1000µF D106 D206 .47µF D107 D207 .01µF...
  • Page 31 C 7781-5 R150 R250 A10266-2721 R151 R251 A10266-1031 R152 R252 A10266-1231 R153 R253 C 5868-2 R156 R256 A10266-1321 Micro-Tech 1200 Amplifier Service Manual 3.3K 1W R157 R257 5K POT R158 R258 4.99K R159 R259 R161 R261 100K 1% R162 R262 2.7K...

  • Page 32: Q42776-7 Main Module

    C148 C248 C 6810-3 C 149 C249 C 6808-7 C150 C250 C151 C251 C152 C252 C 6809-5 C153 C253 C 6804-6 Micro-Tech 1200 Amplifier Service Manual DIODES 470µF 470µF .47µF .01µF .01µF 33µF .01µF 22µF .022µF D104 D204 .1µF D105...
  • Page 33 R226 C 7782-3 R127 R227 A10266-6821 R128 R228 A10266-1031 R129 R229 A10266-1041 R130 R230 A10266-1041 R131 R231 A10266-1031 Micro-Tech 1200 Amplifier Service Manual PN4250A R132 R232 2N3859A R133 R233 2N3859A R134 R234 2N4125 R135 R235 2N4125 R136 R236 2N4123 R137...
  • Page 34 MOUNTS U104, U204: C 3450-1 COVERS FOR J100, J200: C 6778-2 STRAIN RELIEF: C 1811-6 CIRCUIT BOARD: D 7251-8 Micro-Tech 1200 Amplifier Service Manual MC7815 MC7915 UPA75 PNP UPA76 NPN MC34084P HDR, 5 PIN 16 PIN Soc HDR, 6 PIN...

  • Page 35: Q42980-5 Main Module

    C150 C250 C 6806-1 C151 C251 C 6806-1 C152 C252 C 6950-7 C153 C253 C 6804-6 C154 C254 C 8426-6 Micro-Tech 1200 Amplifier Service Manual C155 C255 C156 C256 1000µF C157 C257 470µF .47µF DIODES .01µF .01µF .1µF 22µF 10pF .022µF...
  • Page 36 R226 C 7782-3 R127 R227 A10266-6821 R128 R228 A10266-1031 R129 R229 A10266-1041 R130 R230 A10266-1041 R131 R231 A10266-1031 Micro-Tech 1200 Amplifier Service Manual 2N3859A R132 R232 2N3859A R133 R233 2N4125 R134 R234 2N4125 R135 R235 2N4123 R136 R236 2N4123 R137...
  • Page 37 U200 C 6911-9 U101 U201 C 4345-2 U102 U202 C 4345-2 U103 U203 C 6910-1 U104 U204 C 7558-7 Micro-Tech 1200 Amplifier Service Manual CONNECTORS J100 J200 J500 J800 100K J600 J700 4.7K MISC MOUNTS U1, U2: 4.7K 470K 470K 1.5K...

  • Page 38: Q43035-7 Main Module

    C251 C 6806-1 .01µF C152 C252 C 6950-7 82pF 5% C153 C253 C 8897-8 .1µF C154 C254 C 8426-6 .1µF 250V Micro-Tech 1200 Amplifier Service Manual C155 C255 C156 C256 C157 C257 DIODES D108 D208 D109 D209 D110 D210 D111...
  • Page 39 A10266-1031 R129 R229 A10266-1041 100K R130 R230 A10266-1041 100K R131 R231 A10266-1031 R132 R232 C 5062-2 100K Pot (+ODEP) Micro-Tech 1200 Amplifier Service Manual R133 R233 R134 R234 R135 R235 R136 R236 R137 R237 R138 R238 R139 R239 R140 R240...
  • Page 40 C 4345-2 LM339 U102 U202 C 4345-2 LM339 U103 U203 C 6910-1 UPA76 U104 U204 C 7558-7 MC33079P Micro-Tech 1200 Amplifier Service Manual MISC. Board Socket Heatsink Torq Spreader C 6541-4 Washer Screw J100 J200 Cover J500 J800 J600 J700...

  • Page 41: Q43031-6 Main Module

    C251 C 6806-1 .01µF C152 C252 C 6950-7 82pF 5% C153 C253 C 8897-8 .1µF C154 C254 C 8426-6 .1µF 250V Micro-Tech 1200 Amplifier Service Manual C155 C255 C156 C256 C157 C257 DIODES D108 D208 D109 D209 D110 D210 D111...
  • Page 42 A10266-1031 R129 R229 A10266-1041 100K R130 R230 A10266-1041 100K R131 R231 A10266-1031 R132 R232 C 5062-2 100K Pot (+ODEP) Micro-Tech 1200 Amplifier Service Manual R133 R233 R134 R234 R135 R235 R136 R236 R137 R237 R138 R238 R139 R239 R140 R240...
  • Page 43 C 4345-2 LM339 U102 U202 C 4345-2 LM339 U103 U203 C 6910-1 UPA76 U104 U204 C 7558-7 MC33079P Micro-Tech 1200 Amplifier Service Manual MISC. Board Socket Heatsink Torq Spreader C 6541-4 Washer Screw J100 J200 Cover J500 J800 J600 J700...

This manual is also suitable for:

Micro-tech mt-1200Micro-tech-1200

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