Crown Audio 1200 service manual Module and Schematic Information

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Micro-Tech 1200 Amplifier Service Manual

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.

OUTPUT MODULES: (left and right are identical) Q42549-8

Original output module on P10115-7 board. No longer available. Use Q42717-1 as service replacement. Q42647-0

Output module on P10137-1. No longer available. Use Q42717-1 as service replacement.

Q42717-1

Output module on P10233-8 board.

Q42871-6

Output module on P10305-4 board.

Q42968-0

Output module on P10341-9 board. No longer avail- able. Use Q43202-3 as service replacement. Q43202-3

Output module on P10397-1 board.

MAIN MODULES:

Q42552A0

Original main module on D 6304A4 or D 6304B2 board. No longer available. Use Q42776-7 as service replacement.

Q42714-8

Main module on D 6910-0 board. No longer available. Use Q42776-7 as service replacement.

Q42776-7

Main module on D 7251-8 board. Used as a replace- ment for all older modules.

Q42980-5

Main module on D 7911-7 board. No longer available use Q43033-2 as service replacement.

Q43035-7

Main module on D 7993-5 board. No longer available use Q43033-2 as service replacement.

Q43031-6

Main module on D 7993-5 board.

FUSE MODULE:

M43534-3 (120V 60Hz U.S. Units Only) Fuse module on P10391-4 board.

Q42866-6 -Channel 2 (Universal Volt Units Only) Fuse module on P10296-5 board.

Q42867-4 -Channel 1 (Universal Volt Units Only) Fuse module on P10295-7 board.

DISPLAY MODULE:

Q43061-3 (With ODEP Indicators) Display module on D 8030-5 board. M43530-1 (Old style with SUPPLY Indicators) LED Assembly.

SCHEMATIC INFORMATION:

The schematics provided are representative only. There may be slight variations between amplifier to amplifier. These schematics are intended to be used for troubleshooting purposes only.

For amplifiers with main boards D 6304A4, D 6304B2 or D 6910-0 refer to schematic number J0190-9.

For amplifiers with main board D 7251-8 refer to schematic number J0444-0.

For amplifiers with main boards D 7911-7 or D 7993- 5 refer to schematic number J0638-8.

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Contents MICRO-TECH-1200 Avis Table of Contents Scope WarrantyIntroduction Parts Information Specifications PowerVoltage Conversion Features TheoryOverview Front END OperationVoltage Amplification Grounded Bridge TopologyLast Voltage Amplifiers LVAs Voltage TranslatorsHigh Side HS Low Side LSOutput Device Emulation Protection Odep Positive Electrical Checkout Procedures Test 2 Output Bias AdjustmentTest 3 Odep Voltage Adjustment Standard Initial ConditionsTest 4 AC Power Draw Test 5 Common Mode RejectionTest 7 Phase Response Test 12 Output PowerTest 16 Signal to Noise Ratio Test 13 Reactive LoadsTest 14 Odep Limiting Test 15 LF ProtectionPost Testing Test 19 Intermodulation DistortionTest 20 Clipping Spec at 0 dB Output 0.01% Spec at -35 dB Output 0.05%Parts List Non-Module Power SupplyOutput Assembly ONE PER Channel Supplimental ItemsOutput Assembly Back Panel 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 Q42552A0 Main Module D6304A4/D6304B2 board Parts List Resistor NetworksSwitches ConnectorsIntegrated Circuits Mounts U1, U2Q42714-8 Main Module D 6910-0 board Parts List Dpdt Q42776-7 Main Module D 7251-8 board Parts List OpenQ42776-7 Main Module D 7251-1 board Parts List HDR, 5 PIN Q42980-5 Main Module D7911-7 board Parts List Resistors DP3T Q43035-7 Main Module D7993-5 board Parts List NPN MPS8097Jumper IC’S Q43031-6 Main Module D7993-5 board Parts List Resistor Networks Switches