Agilent Technologies 6541A, Service Manual

Page: 6 / 179

6
Disassembly Procedures ................................................................................................................................................... 72
List of Required Tools ................................................................................................................................................... 74
Top Cover, Removal & Replacement ............................................................................................................................ 74
A2 GPIB Board, Removal & Replacement (for 664xA & 665xA Models Only) .......................................................... 74
A2 Isolator Board, Removal & Replacement (for 654xA & 655xA Only) .................................................................... 75
Front Panel Assembly, Removal and Replacement........................................................................................................ 75
S1 Line Switch, Removal and Replacement................................................................................................................... 76
A3 Front Panel Board, Removal and Replacement ........................................................................................................ 76
A1 Main Board .............................................................................................................................................................. 77
A4 Heatsink Assembly (500 Watt Models 6x5xA Only) ............................................................................................... 77
A4A1 or A4A3 Left Tunnel Board, Removal and Replacement.................................................................................... 78
A4A2 or A4A4 Right Tunnel Board .............................................................................................................................. 78
B1 Fan, Removal and Replacement ............................................................................................................................... 78
T1 Power Transformer, Removal and Replacement....................................................................................................... 78
Principles of Operation ........................................................................................................................................................ 81
Introduction....................................................................................................................................................................... 81
I/O INTERFACE SIGNALS............................................................................................................................................. 81
Overall Block Diagram (Figure 4-2)................................................................................................................................. 83
Detailed Block Diagram Discussion ................................................................................................................................. 83
Secondary Interface Circuits (Figure 4-3) ...................................................................................................................... 83
Output Power and Control Circuits (Figure 4-4)............................................................................................................ 86
Output Power .............................................................................................................................................................. 86
Control Circuits ........................................................................................................................................................... 86
A3 Front Panel Board Circuits (Figure 4-5)................................................................................................................... 89
A2 GPIB Board Circuits For Agilent Models 664xA and 665xA Only ......................................................................... 90
Isolator Board Circuits for Agilent Models 654xA and 665xA Only (Figure 4-7) ........................................................ 91
Replaceable Parts ................................................................................................................................................................. 95
Introduction....................................................................................................................................................................... 95
Chapter Organization ..................................................................................................................................................... 95
Model Applicability ....................................................................................................................................................... 95
How To Order Parts.......................................................................................................................................................... 95
Diagrams ............................................................................................................................................................................. 137
Introduction..................................................................................................................................................................... 137
Interconnections.............................................................................................................................................................. 137
AC Input and Transformer Connections ......................................................................................................................... 137
Circuit Board Schematics................................................................................................................................................ 137
Component Location Diagrams ...................................................................................................................................... 137
Test Points ...................................................................................................................................................................... 139
Index .................................................................................................................................................................................... 173
Manual Backdating Changes............................................................................................................................................. 169