Fluke 5790A Service Manual page 6

5790A
Service Manual
4
5
3-28. Verifying Absolute AC Error for Region IV (70 mV through
700 mV Range) ............................................................................ 3-49
3-29. Verifying Absolute AC Error for Region II (2.2 V through
1000 V Range) ............................................................................. 3-52
3-30. Verifying Absolute AC Error for Region V (2.2 mV through
22 mV) ......................................................................................... 3-53
3-31. Verifying the Wideband AC Option................................................. 3-53
3-32. Wideband 1-kHz Gain VerificatioN, 7V, 2.2V, 700 mV, and
70 mV Ranges .............................................................................. 3-65
3-33. WIDEBAND 1-kHz GAIN VERIFICATION, 22 mV RANGE . 3-65
3-34. Wideband Gain Verification, 10 Hz to 500 kHz.......................... 3-66
3-35. Wideband Flatness Verification ................................................... 3-66
Maintenance......................................................................................... 4-1
4-1. Introduction........................................................................................... 4-3
4-2. Cleaning the Air Filter .......................................................................... 4-3
4-3. General Cleaning .................................................................................. 4-3
4-4. Cleaning PCA's..................................................................................... 4-4
4-5. Access Procedures ................................................................................ 4-5
4-6. Top and Bottom Covers.................................................................... 4-5
4-7. Digital Section Cover ....................................................................... 4-5
4-8. Analog Section Covers ..................................................................... 4-5
4-9. Rear Panel Removal and Installation................................................ 4-5
4-10. Rear Panel Assembly Access ........................................................... 4-6
4-11. Front Panel Removal and Installation .............................................. 4-7
4-12. Display Assembly Removal and Installation ............................... 4-7
4-13. Keyboard Assembly Removal and Installation............................ 4-7
4-14. Analog Assembly Removal and Installation .................................... 4-8
4-15. Digital Assembly Removal and Installation..................................... 4-8
4-16. Power Transformer Removal and Installation.................................. 4-8
4-17. Hybrid Cover Removal..................................................................... 4-9
4-18. Installing a Wideband AC Module (Option -03) .................................. 4-9
4-19. Clearing Ghost Images from the Control Display ................................ 4-10
4-20. Replacing the Clock/Calendar Backup Battery .................................... 4-11
4-21. Using Remote Commands Reserved for Servicing .............................. 4-11
4-22. Using the FATALITY? and FATALCLR Commands..................... 4-11
4-23. Error Codes ........................................................................................... 4-12
Troubleshooting .................................................................................. 5-1
5-1. Introduction........................................................................................... 5-3
5-2. Main CPU (A20) Power-Up Tests ................................................... 5-3
5-3. A17 Guard Crossing Processor Power-Up Tests.............................. 5-3
5-4. System Startup Tests ........................................................................ 5-4
5-5. Diagnostic Tests ............................................................................... 5-4
5-6. Test Step: MAMA8255 (Motherboard 8255) .............................. 5-5
5-7. Test Step: DAC8254 (DAC 8254) ............................................... 5-6
5-8. Test Step: AD8255 (A/D 8255) ................................................... 5-6
5-9. Test Step: ADSELFTEST (A/D Internal Selftest) ....................... 5-7
5-10. Test Step: ADZEROS (A/D Zeros).............................................. 5-7
5-11. Test Step: ADNULLDAC (A/D Null DAC)................................ 5-7
5-12. Test Step: ADDAC (A/D DAC Output) ...................................... 5-8
5-13. Test Step: CHOPPER (A/D Chopper) ......................................... 5-9
5-14. Test Step: PROT (Protection) ...................................................... 5-10
5-15. Test Step: OVLD (Overload) ....................................................... 5-10
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