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5-1
Chapter 5
Diagnostic Testing and Troubleshooting
(2620A/2625A)
Title Page
5-1. Introduction .......................................................................................... 5-3
5-2. Servicing Surface-Mount Assemblies.................................................. 5-3
5-3. Error Codes........................................................................................... 5-4
5-4. General Troubleshooting Procedures................................................... 5-6
5-5. Power Supply Troubleshooting............................................................ 5-8
5-6. Raw DC Supply................................................................................ 5-8
5-7. Power Fail Detection........................................................................ 5-8
5-8. 5-Volt Switching Supply.................................................................. 5-8
5-9. Inverter............................................................................................. 5-9
5-10. Analog Troubleshooting....................................................................... 5-12
5-11. DC Volts Troubleshooting............................................................... 5-17
5-12. AC Volts Troubleshooting............................................................... 5-17
5-13. Ohms Troubleshooting..................................................................... 5-18
5-14. Digital Kernel Troubleshooting ........................................................... 5-19
5-15. Digital and Alarm Output Troubleshooting ......................................... 5-21
5-16. Digital Input Troubleshooting.............................................................. 5-21
5-17. Totalizer Troubleshooting.................................................................... 5-21
5-18. Display Assembly Troubleshooting..................................................... 5-23
5-19. Variations in the Display...................................................................... 5-25
5-20. Calibration Failures.............................................................................. 5-26
5-21. Introduction...................................................................................... 5-26
5-22. Calibration-Related Components..................................................... 5-26
5-23. Retrieving Calibration Constants..................................................... 5-28
5-24. Replacing the EEPROM (A1U1)..................................................... 5-28
5-25. IEEE-488 Interface PCA (A5) Troubleshooting .................................. 5-29
5-26. Memory PCA (A6) Troubleshooting ................................................... 5-29
5-27. Power-Up Problems ......................................................................... 5-29