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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, 06:34 AM   #11
Chopperbuilder is offline Chopperbuilder  United States
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Yes, a 50hz test tone. It was clipping with the volume set pretty low.
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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, 06:40 AM   #12
Perry Babin is offline Perry Babin  United States
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With the scope set the same as when you took the post 7 photo, how far up does the scope trace deflect if you touch the probe to the rail voltage?

What is the rail voltage, measured with a multimeter? black probe on the RCA shield
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Old 9th March 2019, 06:43 AM   #13
Chopperbuilder is offline Chopperbuilder  United States
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This is using the 100hz test tone you provided. Volume turned down low.


Also attached a photo of the setting I had to use to get a wave form.
Attached Images
File Type: jpg 20190309_013730.jpg (427.4 KB, 26 views)
File Type: jpg 20190309_013812.jpg (601.5 KB, 25 views)
File Type: jpg 20190309_013002.jpg (434.2 KB, 25 views)
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Old 9th March 2019, 06:58 AM   #14
Perry Babin is offline Perry Babin  United States
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Did you see post #12?
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Old 9th March 2019, 06:59 AM   #15
Chopperbuilder is offline Chopperbuilder  United States
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When I touch the probe to the rail voltage, the trace defects from where it is in the photo to where the yellow line is.



Rail voltage is at +34.98v and -34.98v.
Attached Images
File Type: jpg 20190301_002353-1.jpg (512.6 KB, 22 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, 07:03 AM   #16
Perry Babin is offline Perry Babin  United States
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So... the amp is clipping at about 10v with a rail voltage of 30+v?

Do you have 15v on the power supply pins of all of the op-amps?
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Old 9th March 2019, 07:51 AM   #17
Chopperbuilder is offline Chopperbuilder  United States
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If I were to say the amp is clipping at about 10v, I would be guessing but it sounds about right.



I do not have +/- 15v on the power supply pins of any of the op-amps. Given that I tested the right pins... See attached photo for the pins I tested and voltages.
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File Type: jpg 20190308_222609-2.jpg (921.9 KB, 22 views)
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Old 9th March 2019, 07:59 AM   #18
Perry Babin is offline Perry Babin  United States
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15 is sort of a generic term. I can't remember which amps use 10 or 18 or anything in-between.

You're not pointing to the power supply pins of the NE5534s.
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Old 9th March 2019, 08:04 AM   #19
Chopperbuilder is offline Chopperbuilder  United States
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Will you point out the power supply pins for me? I'm apparently not reading the data sheet for the NE5532N correctly.
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Old 9th March 2019, 08:08 AM   #20
Perry Babin is offline Perry Babin  United States
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Aren't the ICs near the rail caps NE5534s, not NE5532s?
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