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I had alot of similar problems with the connecting ribbon cables myself. Sometimes the envelopes would be completely different between boards. I also one time had a slight difference between them that was fixed by calibrating the power supply. The pot board 4051's have been pretty problematic too. T...
Well, replacing the transistors, diodes, and the 4558 in the temp. And osc. 1 circuit has greatly improved things. Osc. 1 comes in in seconds rather than a half hour, so after a normal warmup time, it's good to go
- Sun Jun 08, 2014 6:19 am
- Forum: Gear Services & Other Goods
- Topic: Wanted: OB-Xa bender pot
- Replies: 1
- Views: 775
The old bender in mine is absolutely no good anymore. I got a new pot from radioshack, and the shaft would wobble bad and make the pitch go out everytime I looked at it. Do I need a different type? Does somebody have one they know will work?
Touching or blowing on any of the temperature circuit parts makes the problem come back, after it takes it's warm up time. This doesn't happen for osc. 2. I don't know much about the temperature circuit, but something must be bad there, just don't know how to tell..
I have, with no luck. I turned the osc. 1 temp trimmer, and it came to pitch, and so fooled around with some of the temp. circuit parts. It seems like it may be better now, I'll wait and see how it does over time.
Oscillator 1 on my source has quit on me. Before it went completely out it would fail to switch to triangle wave, now it doesn't make any sound for a while. After warming up for a long time, it makes a very high pitch FM type sound and slowly comes down closer to the note it should be, but is pretty...
- Fri Mar 28, 2014 3:15 am
- Forum: General Synthesizers
- Topic: anyone else like wurly/rhodes/clavinet/organ here?
- Replies: 40
- Views: 9268
Synthesizers are great, but I could never let go of my Vox continental and rhodes bass, ever. For any reason. I also have a rhodes piano (saved it from the high school band closet) and a cp-70, and love them. The rhodes definitely won't be leaving anytime soon, but the cp-70 sure does eat up alot of...
- Mon Feb 17, 2014 9:04 pm
- Forum: HELP!
- Topic: Oberheim OBXA Not Saving After Shut Down
- Replies: 7
- Views: 8608
I have an OB-Xa that did the same thing, even after replacing the battery. My Oberheim DMX did it too. Both of them ended up just needing some diodes replaced in the battery circuit, and maybe a couple caps on the OB-Xa, I believe it had a tantalum in it, and it's always safer to replace those when ...
Common sense prevailed, and I checked the voltage verification steps. IC #145 (another 4051) on the upper board is not recieving a proper 5.6v, but a not so healthy 2v. Now to track down the culprit(s).
Thanks, but I probably won't be able to afford a whole new card, but I know I'll need at least one CEM for this card, the 3310. But now a whole new problem has come up, making the entire synth almost completely useless for now.
It seems it is related to key CV maybe. Those notes' boards that go wacky are not getting past 3 volts for the key CV input when I go higher up the keyboard. Strangely though the top boards are getting proper voltage up until past 4 volts. The schematic has key cv as coming out of a 4051 (U47) on th...
Turns out the bottom boards also start to get crazy after the 3rd B key. They're not distorted badly like the top ones, but they sure don't sound right at all. Thanks in advance to anybody who may have some insight.