Fluke 5725A - Page 5

Contents (continued)
iii
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. Problems 1 or 2: Fault at Power-Up or When Entering Voltage
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