Crown Audio IQ-USM 810 service manual Table of Contents

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

	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

©2000 Crown International, Inc.

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