V
130445-1 Rev. A
MA-2402 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 Features ..................................................................................... 4-1
4.3 Front End Operation................................................................... 4-1
4.3.1 Balanced Gain Stage (BGS) .............................................4-1
4.3.2 Variable Gain Stage (VGS)................................................4-1
4.3.3 Error Amp .......................................................................... 4-1
4.4 Voltage Amplification ................................................................. 4-2
4.4.1 Voltage Translators ........................................................... 4-2
4.4.2 Last Voltage Amplifiers (LVAs)..........................................4-2
4.5 Grounded Bridge Topology .......................................................4-2
4.5.1 High Side (HS) ..................................................................4-2
4.5.2 Low Side (LS) .................................................................... 4-3
4.6 Output Device Emulation Protection (ODEP) ............................. 4-4
5 Maintenance........................................................................... 5-1
5.1 Cautions and Warnings.............................................................. 5-1
5.2 General Information ................................................................... 5-1
5.3 Test Procedures ........................................................................ 5-1
5.3.1 Turn On Delay .................................................................. 5-1
5.3.2 Output Bias Adjustment ................................................... 5-1
5.3.3 ODEP Voltage Adjustment ...............................................5-1
5.3.4 DC Offset........................................................................... 5-2
5.3.5 Quiescent Power Draw..................................................... 5-2
5.3.6 Voltage Gain..................................................................... 5-2
5.3.7 Current Limit .....................................................................5-2
5.3.8 10 kHz Square Wave Response ......................................5-3
5.3.9 Crosstalk ..........................................................................5-3
5.3.10 Output Power .................................................................5-3
5.3.11 ODEP Limiting ................................................................ 5-3
5.3.12 Fan Operation ................................................................5-4
5.3.13 LF Protection .................................................................. 5-4
5.3.14 Signal to Noise ............................................................... 5-4
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