Alesis A4/A8 Service Manual------ v 03/07/03
Table of Contents
PREFACE ......................................................................................................... ii
WARNINGS ...................................................................................................... ii
SAFETY SUGGESTIONS .................................................................................iii
General Troubleshooting ...................................................................................iv
1.00 Theory of Operation .................................................................................. 1
1.10 Input Section................................................................................... 1
1.20 Pre-Amp Section ............................................................................ 2
1.30 Main Amplifier Section .................................................................... 2
1.40 Output Device Protection................................................................ 3
1.50 Bias Circuit ..................................................................................... 3
1.60 Speaker Protection ......................................................................... 4
1.70 Fan Speed Control.......................................................................... 4
1.80 Thermal Management System........................................................ 5
2.00 Updates and Corrections........................................................................... 5
2.10 Stripped Heat Sinks........................................................................ 5
2.20 New Case Bracket Insulator(s) ....................................................... 7
2.30 Transformer Insulators.................................................................... 8
3.00 Troubleshooting......................................................................................... 9
4.00 A4 Service Parts List ................................................................................. 10
4.10 A8 Service Parts List ...................................................................... 13
5.00 Service Manual History ............................................................................. 16
INDEX ............................................................................................................... 17
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