Crown DC-300A Service Manual

Dual-channel laboratory amplifier

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Instruction manual (31 pages)

Instruction manual (42 pages)

Instruction manual (31 pages)

Table Of Contents

Table of Contents

Table of Contents
List of Illustrations
Product View
General Information
Specifications
DC 300A Performance Graphs
Typical Intermodulation Distortion
Typical Harmonic Distortion
Typical Frequency Response
Typical Power Response (Per Channel)
Typical Phase Response
Typical Noise Spectrum
Typical Crosstalk
Typical Limits of VI Output
Typical Damping Factor
Power Efficiency
Installation & Operation
Scope
Unpacking
Mounting
Amplifier Protection Mechanisms
Load Protection Methods
Graph of VI Operating Range of DC-300A Output
Fuse Selector Memograph for Loudspeaker Protection
Relay Controlled Protector with Overload Indicator
Peak Power Limiting Compressor with Overdrive Indicator
Turn-On-Transient Muter for Load Protection
Operating Precautions
Source Resistance and Damping Factor Vs. Length and Size of Ouput Leads
Connecting Output Lines
Connecting Input Lines
Schematic for Full Range Electrostatic Speaker Connections
Schematic of Earphone Pad
Connecting Power
Operating Controls
Table for Selection of Input DC Blocking Capacitor
Low-Pass Filter for Severe RF at Inputs
Normal Hi-Fi Installation
Cleaning
Table of Line Voltage Connections
Amplifier Operating Controls
Normal Hi-Fi Hook-Up Diagram
Circuit Description
Principles of Operation
Outuput Circuitry
Protection Circuits
LVA, LVA Current Source and Bias Servo Circuits
Input Circuitry
Service Procedures
Service Policies
Removal of Front Panel and Chassis Cover
Removal of Chassis Cover Assembly
Replacement of Components on DCA Main PC Board Assembly
Replacement of Level Potentiometer (R100, R200)
Replacement of Power Switch SW1
Replacement of Thermal Switch (SW-2, SW-3)
Test Equipment
Test Procedures
Calibration of Test Equipment
Replacement of Output and Driver Transistors
Test Equipment Table
Test Equipment Complement Chart
Troubleshooting
Verify and Identify the Problem
Visual Inspection
Turn-On Procedure Troubleshooting
Input/Output Offset Voltage Check
Bias Level Check
Checkout Procedure - 1Khz Input, no Load
Fuse Blows or + or -60V Appears at Output
Continuous DC Voltage at Output
Oscillation at Output with or Without Signal
Output Unstable When Adjusting Level Pot
Checkout Procedure - 1Khz Input, with Load
Checkout Procedure - Protection Circuit Tests
Clipping Test
Protection Memory Test
Checkout Procedure - 20Khz Sine Wave Input
Checkout Procedure - 10Khz Square Wave Input
IM (Inter-Modulation) Distortion Test
Bias Level Check and Adjustment
Input/Output Offset Adjustment
Checkout Procedure - 20-20Khz Hum and Noize Test
Checkout Procedure - Quiescent AC Power Consumption
Parts Replacement Kit
Schematics, Parts Lists and Component Locations
Parts Replacement
Rear View: Main Chassis
Front View: Front Panel Removed
Front Panel Assembly Exploded View
Parts List: DCA Main Board Assembly
Parts List: DCA Main Board - Non 2N3773 Outputs
Heatsink PC Board 7954U Component Location
Parts List: Heatsink Board Assembly 41207
Shield Assembly Exploded View
Parts List: Shield Assembly
Transformer Assembly Exploded View
Chassis Exploded View
Filter Capacity Assembly Exploded View
Output Coil Assembly Exploded View

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Table of Contents