Crown Audio service manual MICRO-TECH-1200

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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

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Contents MICRO-TECH-1200 Avis Table of Contents Introduction WarrantyScope Parts Information Power SpecificationsVoltage Conversion Theory FeaturesOverview Front END OperationGrounded Bridge Topology Voltage AmplificationLast Voltage Amplifiers LVAs Voltage TranslatorsLow Side LS High Side HSOutput Device Emulation Protection Odep Positive Test 2 Output Bias Adjustment Electrical Checkout ProceduresTest 3 Odep Voltage Adjustment Standard Initial ConditionsTest 5 Common Mode Rejection Test 4 AC Power DrawTest 7 Phase Response Test 12 Output PowerTest 13 Reactive Loads Test 16 Signal to Noise RatioTest 14 Odep Limiting Test 15 LF ProtectionTest 19 Intermodulation Distortion Post TestingTest 20 Clipping Spec at 0 dB Output 0.01% Spec at -35 dB Output 0.05%Power Supply Parts List Non-ModuleOutput Assembly ONE PER Channel Supplimental ItemsBack Panel Assembly Output AssemblyChassis Front Assembly Main Chassis AssemblyParts List Non-Module Module and Schematic Information Fuse and Display Module Parts Lists Q42549-8 Output Module P10115-7 board Parts List Q42647-0 Output Module P10137-1 board Parts List Q42717-1 Output Module P10233-8 board Parts List Q42871-6 Output Module P10305-4 board Parts List Q42968-0 Output Module P10341-9 board Parts List Q43202-3 Output Module P10397-1 board Parts List Resistor Networks Q42552A0 Main Module D6304A4/D6304B2 board Parts ListConnectors SwitchesIntegrated Circuits Mounts U1, U2Q42714-8 Main Module D 6910-0 board Parts List Dpdt Open Q42776-7 Main Module D 7251-8 board Parts ListQ42776-7 Main Module D 7251-1 board Parts List HDR, 5 PIN Q42980-5 Main Module D7911-7 board Parts List Resistors DP3T NPN MPS8097 Q43035-7 Main Module D7993-5 board Parts ListJumper IC’S Q43031-6 Main Module D7993-5 board Parts List Resistor Networks Switches