Dunlop UV-1 univibe help needed

[BDuguay]

I have a Dunlop UV-1 that was not passing signal, but both LED indicators were working fine. After some testing I was able to determine that the internal voltage regulator (7815) was pooched. I found it odd that even though the voltage regulator was shot, the LED's still worked. Well, somehow during the removal of the bad voltage regulator, and the installation of the new one, the bypass LED stopped lighting as did the actual bypass function. With the new voltage regulator installed, the pedal will now pass signal, but the bypass switch will not engage the effect. The Chorus/Vibrato LED and switch still work fine however.

During the troubleshooting, I removed the plastic shroud that covers the lamp/LDR section to determine if the bulb was getting power and discovered that, with the bad voltage regulator it didn't light at all but with the new voltage regulator installed, it worked fine. Beyond that repair, I did nothing to the pedal. Now, for some reason, the bypass switch and LED do not work. I tested the bypass switch itself and it's fine.

I have done a search but was not able to find anything this particular. I did read that this circuit has a lot of extra stuff going on with regards to electronic switching using CMOS and buffering and such. I'm afraid I've done some CMOS damage.
I'm going to search the net for a schematic but, in the meantime, I was hoping one of you might be able to help me out. Please, please, please!
Thanks,
B.

[dosmun]

99% chanced it is one of the ribbon cable connections.  I recently worked on one and the ribbon cable connections busted about everytime I moved it.

[BDuguay]

I suspected that too but forgot to mention that I checked all the leads in that ribbon cable and everything beeped out. Thanks for replying though, I hate having to bump my own thread.
I have another friend who owns the same pedal and he's agreed to lend it to me for comparison purposes. Any idea where to start?
Another alternative, if I had the darned schematic, would be to change to a mechanical bypass.
Thanks again and if you can lend anymore insight I'm all ears.
B.

[BDuguay]

Fixed!
It's amazing what some dirty contacts can cause.
I ended up sending an email to Dunlop asking for a schematic, or at least a suggestion as to where to start.
As suspected, a copy of the schematic was out of the question but I was advised to replace the control input jack. I checked it once more with my meter and sure enough, it was intermittent due to some crud build up. A little cleaning and eureka!, she wobbles once again.
Let this be a lesson to me/you/us.
B.

[dosmun]

I forgot about that jack.   I had to replace that as well.  Glad to hear you got it going.  Just be careful of the ribbon cable when putting it back together.     Putting it back together is when I started having problems with the ribbon connections.

I also talked with Dunlop support and they were very helpful.  It is always nice to talk to someone in tech support that is willing to help out.

[BDuguay]

Okay, at the risk of flogging a 'fixed' horse here, I was wondering about this control input jack and it's function with the pedal.
I was discussing my triumph with a co-woker just now and he suggested that the external speed control pedal must, when employed, take over the bypassing function. Do you know if this is how it was designed to work?
B.

[dosmun]

The foot controller engages the effect when pushed forward and alters the speed.  When the FC is in the open postion the UV-1 is  "bypassed"