Search found 251 matches

by DesolationBlvd
Thu Apr 25, 2013 1:52 am
Forum: HELP!
Topic: OB-Xa - all EGs gone bad?
Replies: 114
Views: 13941

Re: OB-Xa - power supply issues?

More observations: - no matter how I tweaked the +15V, the -15V always read as -15.2V - the 10K resistor to the right of the battery (the one that should be used to measure the CMOS current drain according to the service manual) - I got two measurements, one of over 100mV, but all subsequent measure...
by DesolationBlvd
Sun Apr 14, 2013 12:55 pm
Forum: HELP!
Topic: OB-Xa - all EGs gone bad?
Replies: 114
Views: 13941

Re: OB-Xa - power supply issues?

Do you have a copy of the schematic? If you give me a connector number and pin where you are taking the reading (or a photo of the top board with the place marked) I will open one of my OBXa's and see what is there. Connector K, pin 1 - what should be the 5.5 V AC according to the table in the serv...
by DesolationBlvd
Sun Apr 14, 2013 3:10 am
Forum: HELP!
Topic: OB-Xa - all EGs gone bad?
Replies: 114
Views: 13941

Re: OB-Xa - power supply issues?

Can you post a pic of your schematic and mark the point where you are seeing that waveform? Can't really follow, but it was on the upper control board, after the connector to the power supply board, the joint right before the first resistor. Can't really remember the scale settings on the oscillosc...
by DesolationBlvd
Sat Apr 13, 2013 11:58 pm
Forum: HELP!
Topic: OB-Xa - all EGs gone bad?
Replies: 114
Views: 13941

Re: OB-Xa - power supply issues?

New PSB installed. Still not working.

Here's a picture of the oscilloscope output on the 5.5 V AC:

Image
by DesolationBlvd
Wed Mar 27, 2013 7:45 pm
Forum: Gear Services & Other Goods
Topic: WTB: Oberheim OB-Xa pot board connector cables
Replies: 2
Views: 1620

Re: WTB: Oberheim OB-Xa early rev power supply board

Already had it in my sig. Edited and bumped this post, for buying all parts needed to repair the OB-Xa.
by DesolationBlvd
Thu Mar 14, 2013 4:10 pm
Forum: HELP!
Topic: Korg Polysix Arpeggiator
Replies: 8
Views: 1433

Re: Korg Polysix Arpeggiator

On the topic of disappointing arpeggiators, I can say that the JP-8080 arpeggiator is screwy. With "hold" on, changing notes will not restart the pattern. This has the nasty side effect of causing octave basslines to flip upside-down, and big multi-octave runs to not sound as expected. Also, the ran...
by DesolationBlvd
Wed Mar 13, 2013 5:47 pm
Forum: Gear Services & Other Goods
Topic: FS: Roland hs-80/alpha juno2 keybed w/springs, keys,contacts
Replies: 3
Views: 1395

Re: FS: Roland hs-80/alpha juno2 keybed w/springs, keys,cont

Some of the keys are actually non-working, but a good cleaning may fix them. I should have clarified this earlier, but I assumed people would be more interested in buying single keys or springs from it. If you're parting it out, then I'd like to get the aftertouch strip. It can't be less functional...
by DesolationBlvd
Fri Mar 01, 2013 3:43 pm
Forum: Gear Services & Other Goods
Topic: FS: Roland hs-80/alpha juno2 keybed w/springs, keys,contacts
Replies: 3
Views: 1395

Re: FS: Roland hs-80/alpha juno2 keybed w/springs, keys,cont

I have a full keybed that I am trying to get rid of. I am not sure what all this is compatible with, but make an offer. I can split this up too. Indiana, USA Did the aftertouch on it work well? My Alpha Juno 2's keybed's aftertouch isn't fully functioning. I think that keybed was also used in D-50.
by DesolationBlvd
Sun Feb 17, 2013 5:49 pm
Forum: General Synthesizers
Topic: What makes the Minimoog sound so good?
Replies: 35
Views: 7197

Re: What makes the Minimoog sound so good?

I've also heard the "Nintendo sound" argument a few times with analog synths. Even in a huge prog band like Dream Theater, Jordan Rudess was being mocked by John Petrucci (tongue in cheek of course) for using too much "nintendo sounds". That is Moogs and other analog synth sounds. "Nintendo Sound" ...
by DesolationBlvd
Wed Feb 13, 2013 2:38 am
Forum: HELP!
Topic: Alpha Juno dead aftertouch - replacement?
Replies: 7
Views: 3831

Re: Alpha Juno dead aftertouch - replacement?

if you have some time and patience you can repair aftertouch in your ju2 :) aftertouch sensor is getting oxidated during all the years. remove keyboard and all the keys, remove metal strip and rubber. now you have to clean 2 brass conductors, strips, metal foil with acetone or sth similar. put it b...
by DesolationBlvd
Wed Feb 13, 2013 2:35 am
Forum: Synth Shootouts
Topic: Juno-60 vs Juno-106
Replies: 41
Views: 40428

Re: Juno-60 vs Juno-106

I take back saying 106 envs are blah. 106 is fast, but it's more thumpy than snappy.
by DesolationBlvd
Wed Feb 13, 2013 2:26 am
Forum: HELP!
Topic: a synth to compliment a JX-3P
Replies: 9
Views: 1100

Re: a synth to compliment a JX-3P

I know what you're talking about. I've felt that strings are probably the JX-3P's weakness. As others have said, the Polysix and the Juno series are excellent, both for strings and for pairing up with JX-3P. I would say the Polysix has a greater variety of string sounds - in addition to the chorus f...
by DesolationBlvd
Tue Feb 12, 2013 4:09 am
Forum: HELP!
Topic: Alpha Juno dead aftertouch - replacement?
Replies: 7
Views: 3831

Re: Alpha Juno issues - aftertouch and one dead output

I got around to it today. Mono output: I accidentally nudged capacitor C3 on the chorus board, and the dead output sprang to life. A little nudging of C2 and C3 caused various combinations of dead and alive outputs. Going to have to be careful re-assembling next time. Aftertouch: The upper strip see...
by DesolationBlvd
Sat Feb 09, 2013 7:48 pm
Forum: HELP!
Topic: OB-Xa - all EGs gone bad?
Replies: 114
Views: 13941

Re: OB-Xa - PSB issues

Finally got the new bridge rectifier installed after cleaning up the damage of removing the old rectifier, in order to rule out the common -5V bridge rectifier problem. Still getting the "traffic cones" on the oscilloscope at the 5.5VAC and a non-responsive front panel. I would guess the next step i...
by DesolationBlvd
Mon Feb 04, 2013 7:27 pm
Forum: HELP!
Topic: Alpha Juno dead aftertouch - replacement?
Replies: 7
Views: 3831

Alpha Juno dead aftertouch - replacement?

While the OB project is on hold, I might as well get a few quirks in my Alpha Juno fixed. The aftertouch has never worked well - it only responds somewhat on the bass side of the keyboard even after I cleaned it thoroughly (and I even heard that only JX-8P suffers from dirty aftertouch, and Alpha Ju...