77
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465/Repairs: Difference between revisions
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→CRT Circuit Troubles
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==CRT Circuit Troubles== | ==CRT Circuit Troubles== | ||
The 465 "Family" of scopes has been known to have issues with "no display" or a "shrunken" screen trace. This includes 465,465B,466,468 and 475 scopes. The schematic for each series is almost identical but each one uses different and component ID numbers in their scematic. | ==The 465 "Family" of scopes has been known to have issues with "no display" or a "shrunken" screen trace. This includes 465,465B,466,468 and 475 scopes. The schematic for each series is almost identical but each one uses different and component ID numbers in their scematic. | ||
1. This may be attributed to a failure of the HV transformer and/or the HV Multiplier. | 1. This may be attributed to a failure of the HV transformer and/or the HV Multiplier. | ||
a. These parts are generally shared across the entire family of instruments. | a. These parts are generally shared across the entire family of instruments. | ||
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11. Re-Test all voltages in the CRT circuit and confirm that they generally agree with the schematic. | 11. Re-Test all voltages in the CRT circuit and confirm that they generally agree with the schematic. | ||
12. Retest for the same waveforms (Step 6 and 8) as before, these should be more close to the ones in the diagrams. | 12. Retest for the same waveforms (Step 6 and 8) as before, these should be more close to the ones in the diagrams. | ||
13. Locate a known good HV Multiplier and replace as needed. | 13. Locate a known good HV Multiplier and replace as needed.== | ||