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4-43.
Window Comparator ................................................................... 4-26
4-44.
Input Clamp ................................................................................. 4-26
4-45.
Transconductance and Cascode Stage......................................... 4-27
4-46.
Midstage ...................................................................................... 4-27
4-47.
Midstage -400V Filter ................................................................. 4-27
4-48.
High Voltage Heat Sink Assemblies ........................................... 4-27
4-49.
Autobias Current Source ............................................................. 4-28
4-50.
Autobias Sense Circuit ................................................................ 4-28
4-51.
High Voltage Amplifier Feedback............................................... 4-29
4-52.
Signal Transformers .................................................................... 4-29
4-53.
Temperature Monitoring.............................................................. 4-29
4-54.
High Voltage Sense Assembly (A6) ................................................ 4-30
4-55.
Sense Amplifier Section .............................................................. 4-32
4-56.
Analog Monitor Section .............................................................. 4-34
4-57.
Serial Interface/Guard Crossing Section ..................................... 4-35
4-58.
Analog Input Switching Section.................................................. 4-35
4-59.
Control Section ............................................................................ 4-36
4-60.
AC Line Voltage Selection Section............................................. 4-37
5
Calibration and Verification .............................................................. 5-1
5-1.
Introduction .......................................................................................... 5-3
5-2.
Where to Find Further Information ...................................................... 5-3
6
Maintenance ....................................................................................... 6-1
6-1.
Introduction .......................................................................................... 6-3
6-2.
Replacing the Fuse ............................................................................... 6-3
6-3.
Cleaning the Air Filter.......................................................................... 6-4
6-4.
General Cleaning.................................................................................. 6-5
6-5.
Cleaning PCA's..................................................................................... 6-5
6-6.
Access Procedures................................................................................ 6-6
6-7.
Initial Access Procedure .................................................................. 6-7
6-8.
Accessing the Power Supply Assembly (A4) .................................. 6-9
6-9.
Accessing the Digital Assembly (A5).............................................. 6-9
6-10.
Accessing the Current Amplifier Assembly (A2)............................ 6-11
6-11.
Accessing the High Voltage Amplifier (A3) ................................... 6-12
6-12.
Accessing the High Voltage Sense Assembly (A6)......................... 6-13
6-13.
Accessing the High Voltage Output Transistors.............................. 6-14
6-14.
Accessing the Interconnect Assembly (A1)..................................... 6-14
6-15.
Enabling Front or Rear Binding Posts.................................................. 6-15
7
Troubleshooting................................................................................. 7-1
7-1.
Introduction .......................................................................................... 7-3
7-2.
5725A Fault Codes............................................................................... 7-3
7-3.
Self Diagnostics.................................................................................... 7-3
7-4.
Manual Tests for Fault Isolation .......................................................... 7-6
7-5.
Standby............................................................................................. 7-7
7-6.
Problem 3: Fault When Entering Voltage Operate .......................... 7-8
7-7.
Problem 4: Fault When Entering Current Standby .......................... 7-8
7-8.
Problem 5: Fault When Entering Current Operate .......................... 7-8
7-9.
Reduced-Voltage Troubleshooting Mode ............................................ 7-8
7-10.
Testing the Power Supply By Itself...................................................... 7-9
iii
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Table of Contents
Troubleshooting
