Moog sonic 6....

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Moog sonic 6....

Postby sam » Tue Nov 03, 2009 9:16 pm

I want to recap the power supply....I see two large old caps, What can i replace them with ...?

Modern replacements ....?
Lam memorymoog.Sonic six.CS30.Roland SH-5..Vp330 mk1.system 101.SH101.Jupiter 8.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
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Re: Moog sonic 6....

Postby sam » Wed Nov 04, 2009 4:04 pm

Anyway the main fault is this....

The keyboard always sustains, The pitch is fine but the keys always play.

I first looked at the envelope generator and replaced ic 14 but it has made no difference.

I now look at IC 4 and 5.....

Any idea's would be very appreciated .... :D
Lam memorymoog.Sonic six.CS30.Roland SH-5..Vp330 mk1.system 101.SH101.Jupiter 8.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Jupiter 4 .Andromeda. OBX.OB-1.
Prophet vs. Pro-one. Wasp.EMS VCS3
sam
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Re: Moog sonic 6....

Postby sam » Thu Nov 05, 2009 12:26 pm

I have replaced ic 4 (741)....But no difference.
Should i look at ic 5..?
BTW..The schems are easy to google... :D

I restore my own synths and have a good knowledge of electronics...I have not worked on a sonic 6.

So any info would be great.
Lam memorymoog.Sonic six.CS30.Roland SH-5..Vp330 mk1.system 101.SH101.Jupiter 8.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Jupiter 4 .Andromeda. OBX.OB-1.
Prophet vs. Pro-one. Wasp.EMS VCS3
sam
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Re: Moog sonic 6....

Postby sam » Sat Nov 07, 2009 1:14 pm

I think i have found the root of this problem.....The -ve rail is reading 22V and should be 15v.
The +ve side is ok...I think the ic 1 (741) could be at fault.

Anyone..?
Lam memorymoog.Sonic six.CS30.Roland SH-5..Vp330 mk1.system 101.SH101.Jupiter 8.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Jupiter 4 .Andromeda. OBX.OB-1.
Prophet vs. Pro-one. Wasp.EMS VCS3
sam
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Re: Moog sonic 6....

Postby schmidtc » Sun Nov 08, 2009 2:43 am

A bad op amp shouldn't give you a voltage rail out of whack like that. But, replacing those 723 voltage regulators is certainly a good idea. -22V sounds pretty close to the unregulated voltage coming off the rectifiers. Dropping in a new IC11 should put it right.
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Re: Moog sonic 6....

Postby sam » Sat Nov 14, 2009 8:51 pm

OK...Thank you the new chip solved that problem but it still hangs on the last played note as if the bypass switch is on.

Very strange....Any ideas...?
Lam memorymoog.Sonic six.CS30.Roland SH-5..Vp330 mk1.system 101.SH101.Jupiter 8.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Jupiter 4 .Andromeda. OBX.OB-1.
Prophet vs. Pro-one. Wasp.EMS VCS3
sam
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Re: Moog sonic 6....

Postby sam » Mon Nov 23, 2009 1:55 pm

I have found the main problem...Q7 TIS97 transistor in the ad circuit.

But where can i find one....Or is there a replacement...?
Lam memorymoog.Sonic six.CS30.Roland SH-5..Vp330 mk1.system 101.SH101.Jupiter 8.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Jupiter 4 .Andromeda. OBX.OB-1.
Prophet vs. Pro-one. Wasp.EMS VCS3
sam
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