77
edits
577/Repairs: Difference between revisions
→Symptom: CRT not coming on. Yellow Collector Warning light on. No functions on unit.
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Magic Smoke came from C587 (TEK p/n 290-0525-00). This is a 1 μF 35V Tantalum . . . . shorted! | Magic Smoke came from C587 (TEK p/n 290-0525-00). This is a 1 μF 35V Tantalum . . . . shorted! | ||
My new 2N3904 is toast. I have plenty. | My new 2N3904 is toast. I have plenty. I think this is the cause of the original failure of Q588. | ||
Pulled C586 and C587 (Same item)to test. Found both testing as Resistors. | Pulled C586 and C587 (Same item)to test. Found both testing as Resistors. | ||
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One very apparent problem at this time was that the dot/trace was VERY bright and the Intensity control had little effect on the brightness. | One very apparent problem at this time was that the dot/trace was VERY bright and the Intensity control had little effect on the brightness. | ||
This was a simple fix. Someone had tried to "adjust" the CRT to make a trace appear (see problem described above) and had turned the Trace Intensity Pot all the way up. | This was a simple fix. Someone had tried to "adjust" the CRT to make a trace appear (see problem described above) and had turned the Trace Intensity Pot all the way up (this did not "fix" the issue). | ||
I adjusted this pot to the approximate mid range position and the Intensity control now works as it should. | I adjusted this pot to the approximate mid range position and the Intensity control now works as it should. | ||