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Audio System X-Ion 280.2
Audio System X-Ion 280.2
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Old 17th November 2019, 05:48 PM   #1
Achim1409 is offline Achim1409  Germany
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Default Audio System X-Ion 280.2

Got this amp for repair. Everything working normal, but i have crackling noise on one channel.

1 RCA on left channel plugged, left channel nearly ok, right channel also playing noises, which belongs to the music.
Both rca cables plugged, more diaorted on both channel.

All filters of, if i press the button for hp or lp, and then deactivate a filter, for about a second everything plays normal.
I expect the TL072 at the input.
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Old 17th November 2019, 06:32 PM   #2
Achim1409 is offline Achim1409  Germany
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TL072 dosnt take effect by changing. Found, that the JR5532 have only 6V. These op-amps directly at the channels...
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Old 17th November 2019, 06:42 PM   #3
Achim1409 is offline Achim1409  Germany
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The op amp with 6 Volts is this circuit. Its nearly exact the same.
The other in the Preamp board have 30V.


So iam not sure if the voltage is correct, because this op amp is in the bias circuit.
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Old 17th November 2019, 08:08 PM   #4
Perry Babin is offline Perry Babin  United States
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Can you see the noise on the scope?

Do you have an audio signal tracer?

6v across pins 4 and 8? This will have much lower voltage than the preamp ICs but 6v would be lower than I'd expect.
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Old 17th November 2019, 08:18 PM   #5
Achim1409 is offline Achim1409  Germany
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No, i cant see it on the scope. Signal trace i dont have. I use a small earphone speaker, but its not loud enough to hear that noise. I have 6.2V accros pin 4 and 8 on each channel.
It sounds, that the noise/music ist blending between the channels.. If i use only one rca input, i still have noise on the other channel. If i push lp filter on and off again, the other channel is quit. If i then connect the 2nd rca cable, the noise is again there. The same if only one rca cable is connected, push lp on and off, increase gain, the noise starts again..
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Old 17th November 2019, 08:42 PM   #6
Perry Babin is offline Perry Babin  United States
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I'd suggest buying a set of bluetooth headphones with a separate transmitter that has 1/8" or RCA inputs. You can sometimes find them for $20US here. They are worth the investment. They allow you to hear very quiet sounds/noises and allow you to pick the best grounding point, even if that point has voltage on it. You'd need to add a small, simple circuit to the input to protect them but it's only caps, diodes, resistors.

Have you tried this with both a standard head unit and with a ground isolated signal source to see if either made a difference?
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Old 17th November 2019, 08:52 PM   #7
Achim1409 is offline Achim1409  Germany
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I will buy a headphone. Seen it in your tutorial. I connected my smartphone as usual. Thats all ready bad enough.
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Old 20th November 2019, 02:27 PM   #8
Achim1409 is offline Achim1409  Germany
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Where is the best point to connect the ground from the Signal trace? RCA Ground?
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Old 20th November 2019, 02:38 PM   #9
Perry Babin is offline Perry Babin  United States
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You need to pick the closest ground. The ground plane near the test point is often best. You can also test across the two input pins of the op-amps when using an isolated tracer.

Start at the RCA input by placing the two tracer probes across the RCA shield and ground. The signal should be clean there.

Did you make the protective circuit for the signal tracer?
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Old 20th November 2019, 02:52 PM   #10
Achim1409 is offline Achim1409  Germany
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Yes, i build it like yours. Works very well. But in the preamp circuit, i cant here any disortion. Also when the ground from the tracer is connected to the rca shield, and i place positive at the positive speaker output. Only when speakers are connectedt to the terminal, then its starts disorting.
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