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Contents
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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
5-28. Failure to Detect Memory PCA .................................................. 5-29
5-29. Failure to Store Data ................................................................... 5-29
5A Diagnostic Testing and Troubleshooting (2635A)........................... 5A-1
5A-1. Introduction .......................................................................................... 5A-3
5A-2. Servicing Surface-Mount Assemblies.................................................. 5A-3
5A-3. Error Codes........................................................................................... 5A-4
5A-4. General Troubleshooting Procedures................................................... 5A-6
5A-5. Power Supply Troubleshooting............................................................ 5A-8
5A-6. Raw DC Supply ............................................................................... 5A-8
5A-7. Power Fail Detection........................................................................ 5A-8
5A-8. 5A-Volt Switching Supply............................................................... 5A-8
5A-9. Inverter............................................................................................. 5A-9
5A-10. Analog Troubleshooting....................................................................... 5A-11
5A-11. DC Volts Troubleshooting............................................................... 5A-16
5A-12. AC Volts Troubleshooting............................................................... 5A-17
5A-13. Ohms Troubleshooting..................................................................... 5A-17
5A-14. Digital Kernel Troubleshooting ........................................................... 5A-18
5A-15. Digital and Alarm Output Troubleshooting ......................................... 5A-21
5A-16. Digital Input Troubleshooting.............................................................. 5A-21
5A-17. Totalizer Troubleshooting.................................................................... 5A-23
5A-18. Display Assembly Troubleshooting..................................................... 5A-23
5A-19. Variations in the Display...................................................................... 5A-26
5A-20. Calibration Failures.............................................................................. 5A-27
5A-21. Introduction...................................................................................... 5A-27
5A-22. Calibration-Related Components..................................................... 5A-27
5A-23. Retrieving Calibration Constants..................................................... 5A-29
5A-24. Replacing the Flash Memory (A1U14 and A1U16)........................ 5A-29
5A-25. Memory Card I/F PCA (A6) Troubleshooting..................................... 5A-30
5A-26. Power-Up Problems......................................................................... 5A-30
5A-27. Failure to Detect Memory Card I/F PCA .................................... 5A-30
5A-28. Failure to Detect Insertion of Memory Card............................... 5A-31
5A-29. Failure to Power Card / Illuminate the Busy Led........................ 5A-31