OSC RMX 850 - Table of Contents

RMX Series Technical Service Manual 3
Table of Contents
RMX Series Performance Specifications ........................................................................................................................................ 4
1. Introduction ........................................................................................................................................................................................ 6
1.1 Service bulletins ................................................................................................................................................................................ 6
1.2 The well-equipped service bench ..................................................................................................................................................... 6
1.3 Working with surface-mount components ....................................................................................................................................... 6
1.4 Series description ............................................................................................................................................................................. 8
1.5 Technical descriptions and theory of operation ................................................................................................................................ 8
2. Component identification and pinout ........................................................................................................................................... 10
3. Troubleshooting: Symptoms, causes, & remedies ..................................................................................................................... 12
3.1 Excessive current draw ..................................................................................................................................................................... 12
3.2 Protection, muting, and turn-on/turn-off delay problems ................................................................................................................ 12
3.3 Faults with signal present ................................................................................................................................................................. 13
3.4 Instability ........................................................................................................................................................................................... 13
3.5 Power supply & rail balancing problems .......................................................................................................................................... 14
4. RMX calibration procedures .......................................................................................................................................................... 14
4.1 Setting bias ....................................................................................................................................................................................... 14
4.2 Setting positive and negative current limits ..................................................................................................................................... 15
5. Servicing RMX amplifiers ............................................................................................................................................................... 16
5.1 Mechanical disassembly and re-assembly ....................................................................................................................................... 16
6. Replacement parts ............................................................................................................................................................................ 17
6.1 RMX 850 Replacement Parts ............................................................................................................................................................ 17
6.2 RMX 1450 Replacement Parts .......................................................................................................................................................... 20
6.3 RMX 2450 Replacement Parts .......................................................................................................................................................... 23
7. Schematics and diagrams ............................................................................................................................................................... 27
7.1 RMX Assembly/Disassembly Diagram 1 of 2
(All models) ............................................................................................................... 27
7.2 RMX Assembly/Disassembly Diagram 2 of 2 (All models) ............................................................................................................... 28
7.3 RMX 850 Schematic Diagram 1 of 3 Channel 1 ............................................................................................................................... 29
7.4 RMX 850 Schematic Diagram 2 of 3 Channel 2 ............................................................................................................................... 30
7.5 RMX 850 Schematic Diagram 3 of 3 Power Supply ......................................................................................................................... 31
7.6 RMX 1450 Schematic Diagram 1 of 3 Channel 1 ............................................................................................................................. 32
7.7 RMX 1450 Schematic Diagram 2 of 3 Channel 2 ............................................................................................................................. 33
7.8 RMX 1450 Schematic Diagram 3 of 3 Power Supply ....................................................................................................................... 34
7.9 RMX 2450 Schematic Diagram 1 of 3 Channel 1 ............................................................................................................................. 35
7.10 RMX 2450 Schematic Diagram 2 of 3 Channel 2 ........................................................................................................................... 36
7.11 RMX 2450 Schematic Diagram 3 of 3 Power Supply ..................................................................................................................... 37
7.12 RMX 850 Chassis Wiring Diagram ................................................................................................................................................. 38
7.13 RMX 1450 Chassis Wiring Diagram ............................................................................................................................................... 39
7.14 RMX 2450 Chassis Wiring Diagram ............................................................................................................................................... 40