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Needing help repairing an Orion HCCA 250 Digital Reference
Needing help repairing an Orion HCCA 250 Digital Reference
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Old 9th March 2019, 08:17 AM   #21
Chopperbuilder is offline Chopperbuilder  United States
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You are correct. I didn't notice they where different than the other op-amps. The voltage reading on power supply pins of both the Ne5534s is +12.83v and -13.07v
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Multimeter: Blue Point - Model: MT586B / Oscilloscope: Leader - Model: LBO-524 / Power Supply: Modified computer 500 watt
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Old 9th March 2019, 08:26 AM   #22
Perry Babin is offline Perry Babin  United States
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Does the signal remain clean on pin 3 of the NE5534 after it starts to clip at the speaker output?
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Old 9th March 2019, 09:28 AM   #23
Chopperbuilder is offline Chopperbuilder  United States
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It is difficult to be certain as the amp output has dropped so low as to not produce a signal/wave form. I only get a second of a waveform when I turn the amp on. In that time it appears the signal on pin 3 is remaining clean.



I hooked it to a speaker to the amp and it is putting very little sound.



Not sure if you seen back on post #7 where I mentioned the two voltage regulators I circled in the photo are getting hot.
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Old 9th March 2019, 02:39 PM   #24
Perry Babin is offline Perry Babin  United States
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Is the amp shutting down?

Regulators can get hot at idle. Some get so hot that they fail within seconds. If they are producing output and are no shutting down, I wouldn't be concerned. That said, if you're concerned, clamp them to the main heatsink or to a piece of aluminum stock (with insulators) to keep them cool.
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Old 9th March 2019, 03:19 PM   #25
Chopperbuilder is offline Chopperbuilder  United States
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No the amp is not shutting down. I have never seen the voltage regulators get hot on a properly functioning amp when running it on my power supply. The other side voltage regulators are not even getting warm. My thoughts were that there is something wrong in that circuit and why I mentioned it. I do have the amp clamped.
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Old 9th March 2019, 10:08 PM   #26
Chopperbuilder is offline Chopperbuilder  United States
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What are your thoughts on what my scope is doing? When I first power it on, the screen looks like the first photo. After it starts warming up the the waveform slow starts getting smaller until eventually it is a flat line. After that it seems to function basically as it should.



As to your question in post #22: As I mentioned, now when I power the amp up it only produces a waveform form for about 30 seconds. After that, if I shut it down and turn it back on it only produces a waveform for about one second. If I let it sit for 10 minutes it is back to square one again. Catching from the start the signal on pin 3 of the NE5534 looks to be staying clean.
Attached Images
File Type: jpg 20190309_164825.jpg (607.7 KB, 23 views)
File Type: jpg 20190309_164843.jpg (686.2 KB, 24 views)
File Type: jpg 20190309_164936.jpg (745.7 KB, 23 views)
File Type: jpg 20190309_164728.jpg (747.8 KB, 23 views)
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Old 10th March 2019, 04:01 AM   #27
Perry Babin is offline Perry Babin  United States
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I don't know what's wrong with the scope. I only know what I have to know to keep mine running.

Are any of the rail or regulated supply voltages changing significantly as the amp goes from producing output to producing virtually none?
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Old 10th March 2019, 06:29 AM   #28
Chopperbuilder is offline Chopperbuilder  United States
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The rail or regulated supply voltages are not changing at all when as the amp goes from producing output to virtually none.
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Old 11th March 2019, 12:08 AM   #29
Perry Babin is offline Perry Babin  United States
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When the amp starts to clip, the output of the 5534 should go from a slightly distorted sinew wave to a highly distorted waveform that swings to the supply rails of the 5534. Is that what you're seeing on the output terminal of the 5534?
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Old 11th March 2019, 03:19 AM   #30
Chopperbuilder is offline Chopperbuilder  United States
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I'm not sure that I completely understand that. If you could explain a little more would help.

I attached photo's of the wave form on the output of the 5534. Starting with it not clipping to clipping. I noted during this that when the amps drops down to virtually no out put I also loose signal on the output pin of the 5534.
Attached Images
File Type: jpg 20190310_213626.jpg (699.3 KB, 16 views)
File Type: jpg 20190310_215139.jpg (617.4 KB, 6 views)
File Type: jpg 20190310_215203.jpg (532.9 KB, 7 views)
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