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5A-1
Chapter 5A
Diagnostic Testing and Troubleshooting
(2635A)
Title Page
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. 5-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