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zaksplit
Joined: 26 Apr 2012
Posts: 8
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 Posted: Sun Apr 29, 2012 5:19 pm Post subject: |
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| xmlguy wrote: | | So, if you bring down those levels so that they do not distort, then you have solved the problem, right? How high is your main output level? If the main level is anywhere near the max, then it would be normal for some hot patches to distort. So far, it sounds like you have no hardware problem. The patches have been modified to be too loud. Turn them down and save them. |
Yes but I wonder why I cant get factory settings after reinitalization, anymore.If i turn down waveshaping and vda levels it is not the original sound it used to be anymore.It sounds thinner,
regards zak |
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xmlguy
Platinum Member
Joined: 26 Nov 2007
Posts: 3483
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| Posted: Sun Apr 29, 2012 6:21 pm Post subject: |
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How high is your main output level? If you leave the waveshaper and amp levels where they are, and turn down the main output, does the distortion stop? If the factory presets are loaded from ROM, and the main output is at a reasonable level, like at 50%, then the synth should not be distorting when you listen through headphones. Why did I say through headphones and not the main output?... because the main output could easily be overloading whatever it's being sent to due to improper gain levels on the receiving input, causing distortion/clipping that isn't even occurring in the synth itself. So using headphones eliminates any chance that the distorion being heard is external to the synth.
Ok, so if a factory preset is distorting when the main output is set to 50%, then the problem is likely due to a failed component in the D/A converter or the analog output amp section of the main board. The only way to fix this is to have a qualified technician trace the circuit with an oscilloscope to see exactly where the distortion is occuring. It may be easy to fix or hard, depending on what's failing, but you'll have to spend the money for the diagnosis just to find out which. It is usually too expensive to replace the main board on any older synth unless you can find a used one for sale that is being sold for part. Sometimes is could be a single failed capacitor, audio IC, or some kind of damage to the circuit board like a cold/broken solder joint. You can cross your fingers and hope that one of these simple things are causing the problem because they are easy to fix after the diagnosis finds them. |
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synthjoe
Platinum Member
Joined: 21 Apr 2010
Posts: 901
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| Posted: Mon Apr 30, 2012 7:50 am Post subject: |
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| xmlguy wrote: | | How high is your main output level? |
| xmlguy wrote: | | ...should not be distorting when you listen through headphones. |
Two key points to have an answer for, without those we're just making wild guesses...
| T3owner wrote: | | Under normal circumstances, there shouldn't be distortion after a re-initialization and reloading of the factory presets. |
Not within the synth, you're right. However, just as xmlguy wrote, the audio otuputs might be loaded with an improper impedance and/or the following gain structure can be mismanaged, both of which can result in distortion. Therefore I'd also suggest disconnecting all cables but power, connecting a headphone and listening through headhpones at no more than 75% of the main volume fader. |
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T3owner
Full Member
Joined: 17 Jun 2011
Posts: 144
Location: USA
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| Posted: Mon Apr 30, 2012 10:40 am Post subject: |
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| synthjoe wrote: | | T3owner wrote: | | Under normal circumstances, there shouldn't be distortion after a re-initialization and reloading of the factory presets. |
Not within the synth, you're right. However, just as xmlguy wrote, the audio otuputs might be loaded with an improper impedance and/or the following gain structure can be mismanaged, both of which can result in distortion. Therefore I'd also suggest disconnecting all cables but power, connecting a headphone and listening through headhpones at no more than 75% of the main volume fader. |
| zaksplit wrote: | | Distorted sound appears in phoneheads output and main lines L/R outputs. [...] |
Assuming zak's statement is accurate, severe loading of OUT1/L and OUT2/R would now be the only possible external cause. Otherwise, if there's no internal problem, the headphone output would be clean. Connecting only power and headphones while testing makes sense, and if there's still distortion, the problem is internal. |
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synthjoe
Platinum Member
Joined: 21 Apr 2010
Posts: 901
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| Posted: Tue May 01, 2012 4:11 pm Post subject: |
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| zaksplit wrote: | | Distorted sound appears in phoneheads output and main lines L/R outputs. [...] |
You're right, I've overlooked this part of zaksplit's comment with the headphones. So, line outs disconnected and if it still has a distortion with the factory presets, then time for a tech to have a look into it. |
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zaksplit
Joined: 26 Apr 2012
Posts: 8
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| Posted: Thu May 03, 2012 5:12 am Post subject: |
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| xmlguy wrote: | | So, if you bring down those levels so that they do not distort, then you have solved the problem, right? How high is your main output level? If the main level is anywhere near the max, then it would be normal for some hot patches to distort. So far, it sounds like you have no hardware problem. The patches have been modified to be too loud. Turn them down and save them. |
I can get rid of distorsion turning down waveshaping and vta levels but at same time i think that is not factory sound anymore, and question is why i cant get factory sounds after reinitalization? |
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T3owner
Full Member
Joined: 17 Jun 2011
Posts: 144
Location: USA
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| Posted: Thu May 03, 2012 8:56 am Post subject: |
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| zaksplit wrote: | | xmlguy wrote: | | So, if you bring down those levels so that they do not distort, then you have solved the problem, right? How high is your main output level? If the main level is anywhere near the max, then it would be normal for some hot patches to distort. So far, it sounds like you have no hardware problem. The patches have been modified to be too loud. Turn them down and save them. |
I can get rid of distorsion turning down waveshaping and vta levels but at same time i think that is not factory sound anymore, and question is why i cant get factory sounds after reinitalization? |
Zaksplit, your post is basically the same as one from four days ago. Since then, we've discussed disconnecting the line outputs and checking with headphones only.
Does the 01/W distort when listening with only headphones connected? If it's still distorted after reinitialization and reloading of factory presets, then there's a hardware problem in the 01/W - sorry, but nobody can say exactly what might be causing that without opening, examining, and testing your synth. It's probably time to have the 01/W serviced. |
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Mellontikos
Joined: 01 Feb 2012
Posts: 33
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| Posted: Thu May 10, 2012 8:50 pm Post subject: |
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Guys, this is a known issue for the 01/W's.
It's usually bad capacitors, but in worst cases the DAC chip has been damaged as well.
It requires service of the system board, replacing the DAC and all the bad caps.
I've done it before, and it's not an easy job.
Unfortunately, as these boards age, more of them will require this service done to them.
_________________
Korg 01/Wfd, Yamaha Tyros 4, Roland XP-30, Boss DR-770, Kurzweil PC161, Reason 6.5  |
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solidusse#[QKUQQQQQUQQU]
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Joined: 12 May 2012
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Location: Tajikistan
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solidusse#[QKUQQQQQUQQU]
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solidusse#[QKUQQQQQUQQU]
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