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V
130447-1 Rev. A
IQ-USM 810 Service Manual
©2000 Crown International, Inc.
Table of Contents
1 Introduction ............................................................................ 1-1
1.1 Introduction ................................................................................ 1-1
1.2 The IQ-USM 810 ........................................................................ 1-1
1.3 Warranty ..................................................................................... 1-1
2 Specifications ......................................................................... 2-1
3 Circuit Theory ........................................................................ 3-1
3.1 Overview .................................................................................... 3-1
3.2 Power Supply ............................................................................. 3-1
3.3 Input ........................................................................................... 3-1
3.3.1 Input Analog Processing ................................................... 3-1
3.3.2 Clock Signals .................................................................... 3-2
3.3.3 A/D Conversion ................................................................. 3-2
3.3.4 DC Voltages ...................................................................... 3-4
3.4 Output ........................................................................................ 3-4
3.4.1 Clock Buffers ..................................................................... 3-4
3.4.2 DAC Conversion................................................................ 3-4
3.4.3 Output Analog Processing ................................................ 3-4
3.5 SHARC Processing .................................................................... 3-5
3.5.1 +3.3V Power Supply.......................................................... 3-5
3.5.2 Clocks ............................................................................... 3-5
3.5.3 Reset ................................................................................. 3-5
3.5.4 System Control Interface ................................................... 3-5
3.5.5 PLDs .................................................................................. 3-6
3.5.6 Bus Arbitration................................................................... 3-6
3.5.7 Bus Utilization.................................................................... 3-6
3.5.8 DSP Processing ................................................................ 3-6
3.5.9 Audio Routing.................................................................... 3-8
3.6 System Controller ....................................................................... 3-8
3.6.1 Control Processing ............................................................ 3-9
3.6.2 RS232 .............................................................................. 3-10
3.6.3 Crown Bus Loop.............................................................. 3-10
3.6.4 Real Time Clock .............................................................. 3-10
3.6.5 Front Panel ...................................................................... 3-10
3.6.6 Control Port ..................................................................... 3-10
3.7 Front Display ............................................................................ 3-10
4 Maintenance........................................................................... 4-1
4.1 General Information.................................................................... 4-1
4.2 Definitions................................................................................... 4-1
4.3 Required Test Equipment .......................................................... 4-1
4.4 Message String Syntax .............................................................. 4-2