Fluke 5725A, Instruction Manual, Page: 5 / 196

Contents
(continued)
iii
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
8 List of Replaceable Parts .................................................................. 8-1
8-1. Introduction .......................................................................................... 8-3
8-2. How to Obtain Parts ............................................................................. 8-3
8-3 Manual Status Information................................................................... 8-3
8-4. Newer Instruments................................................................................ 8-3
8-5. Service Centers..................................................................................... 8-4
9 Schematic Diagrams.......................................................................... 9-1
Index