Crown ce 4000 - Table of Contents

V
130485-1 Rev. B
CE 4000 Service Manual
©2002 Crown Audio, Inc.
1 Introduction........................................................................................1-1
1.1 Introduction............................................................................................1-1
1.2 The CE 4000 Amplifi er ...........................................................................1-1
1.3 Scope.....................................................................................................1-1
1.4 Warranty.................................................................................................1-1
2 Specifi cations ....................................................................................2-1
3 Theory of Operation ..........................................................................3-1
3.1 Audio Signal Path ..................................................................................3-1
3.1.1 Input Stage...................................................................................3-1
3.1.2 Error Amplifi er...............................................................................3-1
3.1.3 Modulator .....................................................................................3-1
3.1.4 Triangle Generator........................................................................3-2
3.1.5 Output...........................................................................................3-2
3.1.6 Output Filter..................................................................................3-3
3.2 Protection and Control Circuitry.............................................................3-3
3.2.1 Current Monitor.............................................................................3-3
3.2.2 Current Limiter..............................................................................3-4
3.2.3 Display Circuitry ...........................................................................3-4
3.2.4 Control Circuitry............................................................................3-4
3.3 Power Supply Operation........................................................................3-5
3.3.1 Power Entry and Filtering .............................................................3-5
3.3.2 Fuse..............................................................................................3-5
3.3.3 Low-Voltage Supplies (Flyback)...................................................3-5
3.3.4 Turn-On Control Circuitry..............................................................3-5
3.3.5 PFC Boost Stage ..........................................................................3-6
3.3.6 Bridge Isolation Stage..................................................................3-6
4 Maintenance.......................................................................................4-1
4.1 Where to Begin ......................................................................................4-1
4.2 Surface Mount Technology ....................................................................4-1
4.3 Disassembly for Inspection & Service ...................................................4-1
4.3.1 Top Cover Removal ......................................................................4-1
4.3.2 Power Supply Discharge..............................................................4-1
4.3.3 Flyback Supply PWA Removal .....................................................4-3
4.3.4 Input Module (SST) Removal........................................................4-3
4.3.5 Output Panel Removal..................................................................4-3
4.3.6 Back Panel Assembly Removal...................................................4-3
4.3.7 Line Filter PWA Removal ..............................................................4-4
4.3.8 BFG PWA Removal.......................................................................4-4
4.3.9 Main PWA Removal ......................................................................4-4
4.4 Troubleshooting .....................................................................................4-4
4.4.1 Troubleshooting Flyback Power Supply........................................4-4
Table of Contents