OBERHEIM SYNTH

My Matrix 6R has a strange problem - no matter which preset you 
select, with both Stereo option ON and OFF, only Left/Mono channel 
works.
On headphones, on the other hand, you can hear both channels. 

I am trying to find out whether this is an electronic problem or if 
there's something wrong in the setting.

I tried the following to no avail so far:

1. Full Reset ("Calibration")

2. Replaced the 3 ICs at the final amplification stage, which are a 
741, 4082 and 4053. When disconnecting the "Left/Ground/Ground/Right"
 wire going from the main voice board to the headphones/out board, 
and checking the output jack on the voice board with an audio probe, 
only left channel plays, so I guess there is nothing to do with 
neither the output jack board nor the headphones board.

I can't see any component the might have an influence on the right 
channel alone, beside those 3 ICs which I've replaced...

Any suggestions ?

Thanks

Send a value of 64 to the unit on MIDI controller 10. I'm not sure if MIDI
pan is recognized by the 6r, but it's worth a try.

Is there a dedicated VCA for that channel? If so, that might be something to
look at as well. 

-----Original Message-----
From: oberheim@yahoogroups.com [mailto:oberheim@yahoogroups.com] On Behalf
Of gil_we
Sent: Sunday, December 17, 2006 11:57 AM
To: oberheim@yahoogroups.com
Subject: [oberheim] Matrix 6R - only Left/Mono out works...

My Matrix 6R has a strange problem - no matter which preset you select, with
both Stereo option ON and OFF, only Left/Mono channel works.
On headphones, on the other hand, you can hear both channels. 

I am trying to find out whether this is an electronic problem or if there's
something wrong in the setting.

I tried the following to no avail so far:

1. Full Reset ("Calibration")

2. Replaced the 3 ICs at the final amplification stage, which are a 741,
4082 and 4053. When disconnecting the "Left/Ground/Ground/Right"
wire going from the main voice board to the headphones/out board, and
checking the output jack on the voice board with an audio probe, only left
channel plays, so I guess there is nothing to do with neither the output
jack board nor the headphones board.

I can't see any component the might have an influence on the right channel
alone, beside those 3 ICs which I've replaced...

Any suggestions ?

Thanks

Tried checking if you have left and right on splits?

On 17 Dec 2006 at 17:56, gil_we wrote:

> My Matrix 6R has a strange problem - no matter which preset you 
> select, with both Stereo option ON and OFF, only Left/Mono channel 
> works.
> On headphones, on the other hand, you can hear both channels. 
> 
> I am trying to find out whether this is an electronic problem or if 
> there's something wrong in the setting.
> 
> I tried the following to no avail so far:
> 
> 1. Full Reset ("Calibration")
> 
> 2. Replaced the 3 ICs at the final amplification stage, which are a 
> 741, 4082 and 4053. When disconnecting the "Left/Ground/Ground/Right"
>  wire going from the main voice board to the headphones/out board, 
> and checking the output jack on the voice board with an audio probe, 
> only left channel plays, so I guess there is nothing to do with 
> neither the output jack board nor the headphones board.
> 
> I can't see any component the might have an influence on the right 
> channel alone, beside those 3 ICs which I've replaced...
> 
> Any suggestions ?
> 
> Thanks
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 


-- 

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http://www.summasounds.de/

This comes up frequently (I've had several Matrix 6/6R units brought in for 
repair with this "problem") -- it's another case of "RTFM"  ("Read The 
Friendly Manual").

I quote from page 8:  "When STEREO is set to ON, the LEFT/MONO jack outputs 
all sounds from single patches and the sound from the LOWER patch when in 
SPLIT mode;  the RIGHT jack only outputs sound when in SPLIT mode, and this 
sound comes from the UPPER patch."

To learn how to access & program SPLIT mode, RTFM
(read the funny manual)
(read the fine manual)
(read the funky manual)
(READ THE FRIGGIN' THING)
;)

~GMM

At 09:56 AM 12/17/2006, you wrote:

>My Matrix 6R has a strange problem - no matter which preset you
>select, with both Stereo option ON and OFF, only Left/Mono channel
>works.
>On headphones, on the other hand, you can hear both channels.
>
>I am trying to find out whether this is an electronic problem or if
>there's something wrong in the setting.
>
>I tried the following to no avail so far:
>
>1. Full Reset ("Calibration")
>
>2. Replaced the 3 ICs at the final amplification stage, which are a
>741, 4082 and 4053. When disconnecting the "Left/Ground/Ground/Right"
>  wire going from the main voice board to the headphones/out board,
>and checking the output jack on the voice board with an audio probe,
>only left channel plays, so I guess there is nothing to do with
>neither the output jack board nor the headphones board.
>
>I can't see any component the might have an influence on the right
>channel alone, beside those 3 ICs which I've replaced...
>
>Any suggestions ?
>
>Thanks
>
>
>
>
>Yahoo! Groups Links
>
>
>

Thanks !

--- In oberheim@yahoogroups.com, klosmon <klosmon@...> wrote:
>
> This comes up frequently (I've had several Matrix 6/6R units 
brought in for 
> repair with this "problem") -- it's another case of "RTFM"  ("Read 
The 
> Friendly Manual").
> 
> I quote from page 8:  "When STEREO is set to ON, the LEFT/MONO jack 
outputs 
> all sounds from single patches and the sound from the LOWER patch 
when in 
> SPLIT mode;  the RIGHT jack only outputs sound when in SPLIT mode, 
and this 
> sound comes from the UPPER patch."
> 
> To learn how to access & program SPLIT mode, RTFM
> (read the funny manual)
> (read the fine manual)
> (read the funky manual)
> (READ THE FRIGGIN' THING)
> ;)
> 
> ~GMM
> 
> At 09:56 AM 12/17/2006, you wrote:
> >My Matrix 6R has a strange problem - no matter which preset you
> >select, with both Stereo option ON and OFF, only Left/Mono channel
> >works.
> >On headphones, on the other hand, you can hear both channels.
> >
> >I am trying to find out whether this is an electronic problem or if
> >there's something wrong in the setting.
> >
> >I tried the following to no avail so far:
> >
> >1. Full Reset ("Calibration")
> >
> >2. Replaced the 3 ICs at the final amplification stage, which are a
> >741, 4082 and 4053. When disconnecting 
the "Left/Ground/Ground/Right"
> >  wire going from the main voice board to the headphones/out board,
> >and checking the output jack on the voice board with an audio 
probe,

> >only left channel plays, so I guess there is nothing to do with
> >neither the output jack board nor the headphones board.
> >
> >I can't see any component the might have an influence on the right
> >channel alone, beside those 3 ICs which I've replaced...
> >
> >Any suggestions ?
> >
> >Thanks
> >
> >
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
>

Regards

Mauro Tarelli

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