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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 8th March 2019, 04:45 AM   #1
Chopperbuilder is offline Chopperbuilder  United States
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Default Needing help repairing an Orion HCCA 250 Digital Reference

When I got this amp the PS FET's on one side were all blown. I replaced all the PS FET's,the PS MPSA06's and MPSA56's, all output transistors, all electrolytic capacitors and the 494. The amp powers up and plays but it the sound is distorted and not producing full sound output/power. I pulled the muting circuit transistors to see if it would make a change and it had no effect on it.
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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 8th March 2019, 05:11 AM   #2
Perry Babin is offline Perry Babin  United States
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Post a photo of the distorted waveform.
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Old 8th March 2019, 05:13 AM   #3
Chopperbuilder is offline Chopperbuilder  United States
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I haven't repaired my scope yet. If you remember we were thinking it has a bad capacitor.
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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 8th March 2019, 05:55 AM   #4
Perry Babin is offline Perry Babin  United States
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A distortion problem is difficult to diagnose without seeing the signal.

Are both rails equal?

Is both ±regulated voltage present at all op-amps?

Are both channels equally distorted?
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Old 8th March 2019, 07:07 AM   #5
Perry Babin is offline Perry Babin  United States
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It's odd that your scope was able to lock onto the test signal but not on anything else.
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Old 8th March 2019, 05:50 PM   #6
Chopperbuilder is offline Chopperbuilder  United States
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I tried it on a different amp and it was doing the same thing.
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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, 03:49 AM   #7
Chopperbuilder is offline Chopperbuilder  United States
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Join Date: May 2018
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It seems my scope is a little temperamental, sometimes I can get a
non-distorted waveform out of it, other times not. Before I bought my scope it sat in someones storage unit for years. Thinking possibly some of the plug connections inside it are oxidized. Anyway, I was messing with it and was able to get the waveform in the photo (the best photo I could get of the screen).


During the above process I noticed the two voltage regulators (circled in the photo) are getting hot.



Both rails are equal.


Both channels are equally distorted.


As to testing the op-amps, will you give me more direction on how to do so?
Attached Images
File Type: jpg 20190308_215659.jpg (614.2 KB, 48 views)
File Type: jpg 20190308_222609-1.jpg (832.1 KB, 44 views)
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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, 05:34 AM   #8
Perry Babin is offline Perry Babin  United States
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Post a photo of the distorted waveform. If you don't have a signal generator, use one of these:
http://www.bcae1.com/temp/100hz300seconds.zip
http://www.bcae1.com/temp/80hz800hz8khztestsignal01.zip
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Old 9th March 2019, 06:20 AM   #9
Chopperbuilder is offline Chopperbuilder  United States
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I'll use the test tones you provided and post a photo. The photo I posted is of the waveform the amp is producing using a 50hz test tone.
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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, 06:27 AM   #10
Perry Babin is offline Perry Babin  United States
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I assumed that post #7 was a power supply or test signal on the scope. Was that audio?
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