V
130446-1 Rev. A
MA-5002VZ Service Manual
©2000 Crown International, Inc.
Table of Contents
1 Introduction ............................................................................ 1-1
1.1 Introduction ................................................................................ 1-1
1.2 The MA “02” Series Amplifiers ................................................... 1-1
1.3 Scope ......................................................................................... 1-1
1.4 Warranty ..................................................................................... 1-1
2 Specifications ......................................................................... 2-1
3 Voltage Conversion................................................................ 3-1
4 Circuit Theory ........................................................................ 4-1
4.1 Overview .................................................................................... 4-1
4.2 Grounded Bridge Theory ...........................................................4-1
4.2.1 Grounded Bridge Operation .............................................4-2
4.2.2 Output Stage Circuitry.......................................................4-3
4.3 VZ Power Supply........................................................................ 4-4
4.3.1 VZ Supply Operation .........................................................4-4
4.3.2 VZ Supply Circuitry ...........................................................4-5
4.4 ODEP Theory ............................................................................. 4-6
4.4.1 ODEP Operation................................................................4-6
4.4.2 ODEP Circuitry .................................................................. 4-7
4.5 Front End Theory........................................................................ 4-8
4.5.1 Balanced Gain Stage ........................................................ 4-8
4.5.2 Variable Gain Stage .......................................................... 4-8
4.5.3 Error Amp .......................................................................... 4-8
4.5.4 Compessor........................................................................4-9
4.5.5 Loudspeaker Offset Integration ........................................4-9
4.5.6 Voltage Translator and LVA Stages .................................. 4-9
4.5.7 Inverting Stages ................................................................4-9
4.6 Protection Systems .................................................................... 4-9
4.6.1 Soft Start............................................................................4-9
4.6.2 Over-voltage.................................................................... 4-11
4.6.3 DC/LF .............................................................................. 4-11
4.6.4 Commom Mode Output Current...................................... 4-12
4.6.5 Output Thermal ...............................................................4-12
4.6.6 Transformer Thermal ....................................................... 4-12
4.6.7 FET Thermal .................................................................... 4-12
4.6.8 Power Loss......................................................................4-13
4.6.9 Fan Control......................................................................4-13
4.7 Display ..................................................................................... 4-13
4.8 Mono Modes ............................................................................ 4-13
4.8.1 Bridge Mono.................................................................... 4-13
4.8.2 Parallel Mono................................................................... 4-14
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