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Post by Decibel on Aug 29, 2019 14:27:38 GMT -5
I sold a projector around 5 years ago, the new owner contacted me because he has some problems.
After about 30 minutes from power on the tubes turn off.
The fans turn and LEDs light up.
The red LED on the EHT card lights up.
He tried to change all the elements of the high voltage: eht, quad and splitter but the inconvenient is always the same.
Any suggestions?
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Post by robin36mac on Aug 29, 2019 14:31:48 GMT -5
He can try to disconnect the HT leads to the tubes, and let only the red one for example, then only the blue, then only the green.
That we will check that no tubes are shorted.
Did he tried with a tested okay quad ?
I already got a bad surprise with a spare quad.
Robin
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Post by Decibel on Aug 29, 2019 14:43:01 GMT -5
I just contacted him.
He tried another EHT and splitter, perhaps the first quad can be bad.
In this moment he have the three element of new series.
Splitter: R762718
Quad: R762833
EHT: R762716
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Post by Decibel on Aug 29, 2019 16:54:17 GMT -5
He can try to disconnect the HT leads to the tubes, and let only the red one for example, then only the blue, then only the green. That we will check that no tubes are shorted. Just tried, same issue. |
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Post by km987654 on Sept 3, 2019 4:26:03 GMT -5
He can try to disconnect the HT leads to the tubes, and let only the red one for example, then only the blue, then only the green. That we will check that no tubes are shorted. Just tried, same issue. See this.  |
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Post by Decibel on Sept 4, 2019 1:59:18 GMT -5
What is it?
It looks like a circuit of a frame.
But it is not that of a 1209s.
What should I check?
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Post by km987654 on Sept 4, 2019 6:32:33 GMT -5
What is it? It looks like a circuit of a frame. But it is not that of a 1209s. What should I check? Thats a 808s frame but the 1209s also has a scan fail circuit. You need to check all of the boards in the scan fail circuit. |
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