Crown Audio IQ-USM 810

130447-1 Rev. A IQ-USM 810 Service Manual

Figure 3.3 Input Analog Processing Circuitry (one channel)

Contents

Main Digital Processor / Digital Mixer SERVICE MANUAL Some models may be exported under the name Amcron. Models: IQ-USM 810 CAUTION AVIS WARNING Page Page Table of Contents 1 Introduction ............................................................................ 1-1 4 Maintenance........................................................................... 4-1 Table of Contents 5 Parts Information................................................................... 5-1 9 Schematics ............................................................................ 9-1 1.1 Introduction 1.2 The IQ-USM 810 1 Introduction Crown Customer Service Page 2 Specifications General RS232 Data Communication Crown Bus Data Communication Audio Page 3 Circuit Theory 3.1 Overview 3.2 Power Supply 3.3 Input 3.3.1 Input Analog Processing 3.3.2 Clock Signals 3.3.3 A/D Conversion Page 3.4.3 Output Analog Processing 3.3.4 DC Voltages 3.4.2 DAC Conversion 3.4 Output 3.4.1 Clock Buffers 3.5 SHARC Processing 3.5.1 +3.3V Power Supply 3.5.2 Clocks 3.5.3 Reset 3.5.4 System Controller Interface 3.5.5 PLDs 3.5.6 Bus Arbitration 3.5.7 Bus Utilization 3.5.8 DSP Processing Page 3.5.9 Audio Routing 3.6 System Controller 3.6.1 Control Processing 3.6.2 RS232 3.6.3 Crown Bus Loop 3.6.4 Real Time Clock 3.6.5 Front Panel 3.7 Front Display 4 Maintenance 4.1 General Information 4.2 Definitions 4.3 Required Test Equipment WARNING 4.4 IQ Message String Syntax 4.4.1 Host to Device Messages 4.4.2 Device to Host Messages 4.5 Standard Initial Conditions 4.6 Test Procedures 4.6.6 HEAD ROOM / INPUT CLIP LEVEL 4.6.7 INPUT POTENTIOMETER 4.6.8 PHANTOM SUPPLY 4.6.9 CONTROL PORT OUTPUT VOLTAGE PINS 4.6.10 CONTROL PORT LOGIC INPUTS 4.6.12 CONTROL PORT ANALOG INPUTS 4.6.13 DISPLAY TEST 4.6.14 PUSHBUTTON TEST 4.6.15 REAL TIME CLOCK 4.6.16 IQ BUS MASTER CONTROL 4.6.17 IQ BUS DROPOUT RELAY OPERATION 4.6.18 IQ BUS HUB / DAISY CONNECTIONS 4.6.19 SHIPPING STATE RESTORATION 4.6.20 CHASSIS GROUND 4.7 Typical Measurements 4.8 Test/Debug Objects 4.9 Display Test Patterns 4.10 Error Codes 4.11 Troubleshooting FAQs Page 5.1 General Information 5.2 Ordering and Receiving Parts 5.2.1 Terms 5.2.2 Shipment 5 Parts Crown Customer Service Page 6 Exploded View Parts 6.1 General Information Page 6.2 Chassis Assembly Page 7.1 General Information 7.2 IQ-USM 810 Modules 7.2.1 Front Panel Display PWA: 7.2.2 System Controller PWA: 7 Module and Schematic Information Page 8 Module Parts Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 9 Schematic Diagrams