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patrickvf1976
Joined: Aug 08, 2011 Posts: 192 Location: Gig Harbor
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Posted: Tue Jan 15, 2013 11:54 pm Post subject:
Akai AX-60 problem with noise generator |
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My Akai AX-60 has a problem with the noise generator - the noise generator's output has become extremely low all of a sudden and I can't figure out what happened. It was working just fine yesterday and I was able to make some nice thunder and swoosh kind of sounds. Now it struggles to get to a reasonable volume. Everything else works just fine. Any ideas what could cause this problem? |
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patrickvf1976
Joined: Aug 08, 2011 Posts: 192 Location: Gig Harbor
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Posted: Sat Jan 19, 2013 3:50 pm Post subject:
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So.. any suggestions, advice, anything? Anyone? Help?? |
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patrickvf1976
Joined: Aug 08, 2011 Posts: 192 Location: Gig Harbor
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Posted: Tue Jan 29, 2013 9:46 am Post subject:
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Still could use some help here. Any hints what to look for or even some schematics would do. |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Tue Jan 29, 2013 12:00 pm Post subject:
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http://manuals.fdiskc.com/flat/Akai%20AX-60%20Service%20Manual.pdf
first hit on google
Either 1) the noise generator isn't working or 2) the circuit that turns off both noise generators for Noise A and B. 1 seems more likely.
page 40 says that TR4, TR5 and IC21 are responsible for the noise
On page 37, you'll find the noise schematic. It uses these parts:
IC21: BA715STD
TR4: 2SC 3330
TR5: 2SC 3383
Check along the signal path to see if you're getting noise. The schematic lists voltages next to the ECB's of the transistors - that's a good and easy place to start to see if either are blown. _________________ Sneak-Thief - raw electrofunk |
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patrickvf1976
Joined: Aug 08, 2011 Posts: 192 Location: Gig Harbor
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Posted: Tue May 28, 2013 11:10 pm Post subject:
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Finally found some time to open it up and look into it.. what's the best way to check the signal path? I don't have an oscilloscope, just a multimeter which I use to check common components with (caps, op-amps, etc...) I never went that technical as in using a service manual other than some schematics from the web for my really old gear. |
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patrickvf1976
Joined: Aug 08, 2011 Posts: 192 Location: Gig Harbor
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Posted: Tue May 28, 2013 11:14 pm Post subject:
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Nevermind.. failed to read the part with the voltages.. freakin' ADD
So.. can the transistors be substituted for by regular Radioshack transistors or do they have to be exatly this type? |
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