Vintage Synth Repair

OK, time for me to try to get some of these old guys working 
again... Below is a list of what I've got thats broken. If anyone has 
any experience or repair tips they can offer for any of these I 
would greatly appreciate it.

Arp Omni - No audio from synth section

Arp Odyssey mk3 - VCO2 out

Roland Promars - VCO2 out, odd front panel behavior

Prophet-5 Rev. 1 - Gee, a NW Rev. 1?? :-) Various LEDs flicker 
and fade out on power up, no audio or controls working. Tested 
voltages at power supply and voltages were off quite a bit and 0V 
on -5 and -15 so replaced w/new regulators and tantalum caps 
and -5 now OK but -15V outputting -20V, WTF? Also unreg 
measures about 28V instead of 22V.

Rhodes Chroma - All EPROMs were corroded - replaced w/new 
ones but still powers up in weird state, no audio or controls 
working

Roland SH-101 - Sequencer/LFO does not function

Roland SH-101 - Won't power up from batts or AC

Chroma Polaris - 1 voice out

Oberheim SEM - no power

Oberheim SEM - VCO2 constant high freq sound

Sequential MultiTrak - Sound is totally muffled as if VCF is stuck 
w/low cutoff freq

Moog Prodigy - no power

Moog Opus-3 - Always has slow attack regardless of EG setting

Whew! Got my work cut out for me for sure. I am most interested 
in getting the Chroma and P-5 working first. Thanks for any help 
or suggestions!

Doug

I actually forgot a few :

Oberheim OB-SX - Constant crackling sound in audio output

Oberheim OB-Xa - Locks up when entering patch write mode

Moog Multimoog - Ribbon not working

Roland TR-606 - No power from batts or AC

Oberheim OB-8 - 1 voice won't tune up. Tried replacing w/other 
3340s but still doesn't tune

--- In vintagesynthrepair@y..., bigfootstudios@y... wrote:
> OK, time for me to try to get some of these old guys working 
> again... Below is a list of what I've got thats broken. If anyone 
has 
> any experience or repair tips they can offer for any of these I 
> would greatly appreciate it.
> 
> Arp Omni - No audio from synth section
> 
> Arp Odyssey mk3 - VCO2 out
> 
> Roland Promars - VCO2 out, odd front panel behavior
> 
> Prophet-5 Rev. 1 - Gee, a NW Rev. 1?? :-) Various LEDs flicker 
> and fade out on power up, no audio or controls working. 
Tested 
> voltages at power supply and voltages were off quite a bit and 
0V 
> on -5 and -15 so replaced w/new regulators and tantalum caps 
> and -5 now OK but -15V outputting -20V, WTF? Also unreg 
> measures about 28V instead of 22V.
> 
> Rhodes Chroma - All EPROMs were corroded - replaced 
w/new 
> ones but still powers up in weird state, no audio or controls 
> working
> 
> Roland SH-101 - Sequencer/LFO does not function
> 
> Roland SH-101 - Won't power up from batts or AC
> 
> Chroma Polaris - 1 voice out
> 
> Oberheim SEM - no power
> 
> Oberheim SEM - VCO2 constant high freq sound
> 
> Sequential MultiTrak - Sound is totally muffled as if VCF is 
stuck 
> w/low cutoff freq
> 
> Moog Prodigy - no power
> 
> Moog Opus-3 - Always has slow attack regardless of EG 
setting
> 
> Whew! Got my work cut out for me for sure. I am most 
interested 
> in getting the Chroma and P-5 working first. Thanks for any 
help 

> or suggestions!
> 
> Doug

In a message dated 11/17/01 3:05:33 AM Pacific Standard Time, 
bigfootstudios@... writes:

<< Subj:     [vintagesynthrepair] Repairs, Repairs, Repairs!
 Date:  11/17/01 3:05:33 AM Pacific Standard Time

 From:  bigfootstudios@...
 Reply-to:  vintagesynthrepair@yahoogroups.com
 To:    vintagesynthrepair@yahoogroups.com
 
 OK, time for me to try to get some of these old guys working 
 again... Below is a list of what I've got thats broken. If anyone has 
 any experience or repair tips they can offer for any of these I 
 would greatly appreciate it.
 
 Arp Omni - No audio from synth section
 
 Arp Odyssey mk3 - VCO2 out
 
 Roland Promars - VCO2 out, odd front panel behavior
 
 Prophet-5 Rev. 1 - Gee, a NW Rev. 1?? :-) Various LEDs flicker 
 and fade out on power up, no audio or controls working. Tested 
 voltages at power supply and voltages were off quite a bit and 0V 
 on -5 and -15 so replaced w/new regulators and tantalum caps 
 and -5 now OK but -15V outputting -20V, WTF? Also unreg 
 measures about 28V instead of 22V.
 
 Rhodes Chroma - All EPROMs were corroded - replaced w/new 
 ones but still powers up in weird state, no audio or controls 
 working
 
 Roland SH-101 - Sequencer/LFO does not function
 
 Roland SH-101 - Won't power up from batts or AC
 
 Chroma Polaris - 1 voice out
 
 Oberheim SEM - no power
 
 Oberheim SEM - VCO2 constant high freq sound
 
 Sequential MultiTrak - Sound is totally muffled as if VCF is stuck 
 w/low cutoff freq
 
 Moog Prodigy - no power
 
 Moog Opus-3 - Always has slow attack regardless of EG setting
 
 Whew! Got my work cut out for me for sure. I am most interested 
 in getting the Chroma and P-5 working first. Thanks for any help 
 or suggestions!
  >>
Hey
       I just wanted to turn you on to an electronic repair shop that works 
on all the boards you have listed here, and is not afraid to do board level 
repairs. The owners name is Brian and his number is: 1-608-279-1064. His site 
is: Shredhead.hypermart.net        He is in Madison Wisconsin
Richard at Route 66 Studios